Explosion-proof motor

Abstract

The utility model provides an explosion-proof motor, which comprises a motor main body, the motor main body comprises a motor base, a stator and a rotor, the motor base is provided with an installation cavity, the stator is fixedly arranged in the installation cavity, a rotor iron core of the rotor is rotatably arranged in the installation cavity, and a rotor shaft of the rotor extends out of the installation cavity. The mounting cavity and the external space of the motor main body are sealed and isolated; the main power supply junction box is an increased safety type junction box, the main power supply junction box comprises a box body, a plurality of wiring terminals and a plurality of insulation isolation pieces, the plurality of wiring terminals are conductively connected with a winding of the stator, the plurality of wiring terminals are fixedly arranged in the box body, the wiring terminals and the box body are arranged in an insulation mode, and the insulation isolation pieces are arranged in the box body. One or more insulating separators are arranged between any two wiring terminals, and the internal space of the box body is sealed and isolated from the external space of the box body. The explosion-proof motor provided by the utility model solves the technical problem of insufficient safety of the explosion-proof motor in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of motors, and in particular to an explosion-proof motor. Background Art

[0002] Explosion-proof motors are motors that can be used in flammable and explosive places. They are widely used in petrochemical, coal, coal chemical, metallurgy, subway, electricity, oil and gas, military and nuclear markets, etc. As a major power equipment, explosion-proof motors are usually used to drive fans, water pumps, compressors and other mechanical rotations.

[0003] The safety level of explosion-proof motors in related technologies is insufficient, and it is difficult to meet the safety requirements when used in some situations with strict safety requirements. Utility Model Content

[0004] The main purpose of the utility model is to provide an explosion-proof motor to solve the technical problem of insufficient safety of explosion-proof motors in related technologies.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, there is provided an explosion-proof motor, comprising: a motor body, the motor body comprising a base, a stator and a rotor, the base having an installation cavity, the stator being fixedly arranged in the installation cavity, the rotor core of the rotor being rotatably arranged in the installation cavity, the rotor shaft of the rotor extending out of the installation cavity, the installation cavity being sealed and isolated from the external space of the motor body; a main power connection box, the main power connection box being an increased safety connection box, the main power connection box comprising a box body, a plurality of wiring terminals and a plurality of insulating isolation members, the plurality of wiring terminals being conductively connected to the windings of the stator, the plurality of wiring terminals being fixedly arranged in the box body, the wiring terminals being insulated from the box body, one or more insulating isolation members being arranged between any two wiring terminals, and the internal space of the box body being sealed and isolated from the external space of the box body.

[0006] Furthermore, the explosion-proof motor also includes a temperature measuring junction box and a temperature measuring element, the temperature measuring junction box is an increased safety junction box, the temperature measuring element is arranged in the motor body to measure the temperature of the corresponding position, and the lead of the temperature measuring element is electrically connected to the temperature measuring terminal in the temperature measuring junction box; and / or, the explosion-proof motor also includes a heater junction box and a heating element, the heater junction box is an increased safety junction box, the heating element is arranged in the motor body to heat the stator winding, and the lead of the heating element is electrically connected to the heating terminal in the heater junction box.

[0007] Furthermore, a pressure relief port is provided on the box body, and the main power connection box includes a pressure relief plate, which blocks the pressure relief port. When the air pressure in the box body reaches a preset air pressure, the pressure relief plate ruptures under the action of the air pressure. The main power connection box includes a shielding member, which is arranged on the outside of the box body, and the shielding member shields at least part of the pressure relief port.

[0008] Furthermore, the main power junction box also includes an auxiliary isolator, which is made of insulating material. The first end of each insulating isolator is in contact with the inner wall of the box body, and the second end of each insulating isolator is in contact with the auxiliary isolator, wherein the first end and the second end of the insulating isolator are its opposite ends.

[0009] Furthermore, the machine base includes: a machine base body, which is a hollow cylindrical structure; two end plates, which are installed at the opposite ends of the machine base body in a one-to-one correspondence, and an installation cavity is formed between the machine base body and the two end plates; wherein the machine base body includes a bottom plate portion and an arc plate portion, the cross-sectional shape of the arc plate portion is an arc, and the bottom plate portion and the arc plate portion are connected as a whole.

[0010] Furthermore, the stator includes a stator core, which includes: a plurality of stator punchings, surfaces of which are provided with reinforcing ribs; a plurality of stator ventilation slot plates, on which ventilation slots are provided along the radial direction of the explosion-proof motor, a plurality of stator punchings and a plurality of stator ventilation slot plates are stacked along the axial direction of the explosion-proof motor, and a plurality of stator punchings are provided between any two stator ventilation slot plates; a stator extrusion fixing piece, which is provided at the ends of a plurality of stator punchings along the axial direction of the explosion-proof motor so as to extrude and fix the plurality of stator punchings through the stator extrusion fixing piece.

[0011] Furthermore, the main part of the stator extrusion fixing piece is an annular structure, and a convex tooth is provided on the edge of the annular structure. The convex tooth is protruded toward the center side of the explosion-proof motor along the axial direction of the explosion-proof motor, and the convex tooth contacts the stator punching sheet located at the end.

[0012] Furthermore, the rotor includes a rotor shaft and a plurality of rotor punchings, the plurality of rotor punchings are stacked in sequence along the axial direction of the rotor shaft, each rotor punching is provided with an axial hole, the rotor shaft is a plain axis, the rotor shaft is passed through the axial holes of each rotor punching, and the rotor shaft and each rotor punching are connected by an interference fit; each rotor punching is provided with a rotor ventilation hole, the rotor ventilation holes of the plurality of rotor punchings constitute a rotor air duct, and the rotor air duct is extended along the axial direction of the rotor shaft.

[0013] Furthermore, the rotor also includes two end plates, the thickness of the end plates is greater than the thickness of the rotor punchings, and along the axial direction of the rotor shaft, the two end plates are correspondingly arranged at both ends of the multiple rotor punchings to press and fix the multiple rotor punchings through the two end plates.

[0014] Furthermore, the motor body includes: an end cover, a rotor shaft avoidance hole is provided on the end cover, the rotor shaft is inserted into the rotor shaft avoidance hole, and the end cover is connected to the end of the machine base; a water-slinging ring, the water-slinging ring is sleeved on the rotor shaft, and the water-slinging ring is located on the side of the end cover close to the machine base; wherein, a first curved path structure is provided on the side of the end cover facing the water-slinging ring, and a second curved path structure is provided on the side of the water-slinging ring facing the end cover, and the first curved path structure and the second curved path structure constitute a curved path labyrinth sealing structure.

[0015] Furthermore, a concave structure is provided on a side of the end cover facing the base, and / or a slope structure is provided on a side of the water slinger facing the end cover.

[0016] The explosion-proof motor using the technical solution of the utility model includes: a motor body, the motor body includes a base, a stator and a rotor, the base has an installation cavity, the stator is fixedly arranged in the installation cavity, the rotor core of the rotor is rotatably arranged in the installation cavity, the rotor shaft of the rotor extends out of the installation cavity, and the installation cavity is sealed and isolated from the external space of the motor body; a main power connection box, the main power connection box is an increased safety connection box, the main power connection box includes a box body, a plurality of wiring terminals and a plurality of insulating isolation pieces, a plurality of wiring terminals are conductively connected to the windings of the stator, a plurality of wiring terminals are fixedly arranged in the box body, the wiring terminals are insulated from the box body, one or more insulating isolation pieces are arranged between any two wiring terminals, and the internal space of the box body is sealed and isolated from the external space of the box body. In the explosion-proof motor adopting this structural design, the internal installation cavity of the base is sealed and isolated from the external space of the motor body, thereby isolating the internal structure of the installation cavity from the external space, avoiding the internal spark or heat from contacting the external flammable and explosive materials, and achieving the effect of explosion isolation. On this basis, the main power junction box of the explosion-proof motor adopts an increased safety junction box, and its multiple terminals are insulated from the box body, and adjacent terminals are further isolated by insulating spacers, which effectively reduces the risk of arcs or sparks at the terminals, and the box body is sealed and isolated from the external space, further improving safety. The explosion-proof motor with this structural design adopts a flameproof and increased safety composite explosion-proof method, which effectively improves the safety of the motor and solves the technical problem of insufficient safety of explosion-proof motors in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting 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 on the present invention. In the drawings:

[0018] Figure 1 This is a schematic structural diagram of an embodiment of an explosion-proof motor of the utility model at a first viewing angle;

[0019] Figure 2It is a schematic structural diagram of an embodiment of the explosion-proof motor of the utility model at a second viewing angle;

[0020] Figure 3 It is a partial cross-sectional structural schematic diagram of a main power connection box of an embodiment of an explosion-proof motor of the utility model;

[0021] Figure 4 This is a schematic diagram of the internal structure of the main power connection box of an embodiment of the explosion-proof motor of the utility model.

[0022] The above drawings include the following reference numerals:

[0023] 1. Motor body; 11. Frame; 111. Frame body; 112. End plate; 113. Cooling pipe; 12. Rotor; 13. Junction box mounting base; 14. End cover; 2. Main power junction box; 21. Box body; 211. Box body; 212. Box cover; 22. Terminal block; 23. Insulating spacer; 24. Pressure relief plate; 25. Shield; 26. Insulator; 27. Sealing ring; 28. Sealing ring clamping assembly; 281. First component; 282. Second component; 29. ​​Auxiliary spacer; 20. Wire harness fixing; 3. Temperature measurement junction box; 4. Heater junction box; 5. Wind hood. DETAILED DESCRIPTION

[0024] 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 utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Please refer to Figures 1 to 4 The embodiment of the utility model provides an explosion-proof motor, comprising: a motor body 1, the motor body 1 comprises a base 11, a stator and a rotor 12, the base 11 has an installation cavity, the stator is fixedly arranged in the installation cavity, the rotor core of the rotor 12 is rotatably arranged in the installation cavity, the rotor shaft of the rotor 12 extends out of the installation cavity, and the installation cavity is sealed and isolated from the external space of the motor body 1; a main power terminal box 2, the main power terminal box 2 is an increased safety terminal box, the main power terminal box 2 comprises a box body 21, a plurality of wiring terminals 22 and a plurality of insulating isolation members 23, the plurality of wiring terminals 22 are conductively connected to the windings of the stator, the plurality of wiring terminals 22 are fixedly arranged in the box body 21, the wiring terminals 22 are insulated from the box body 21, one or more insulating isolation members 23 are arranged between any two wiring terminals 22, and the internal space of the box body 21 is sealed and isolated from the external space of the box body 21.

[0026] In the explosion-proof motor with this structural design, the internal installation cavity of the base 11 is sealed and isolated from the external space of the motor body 1, thereby isolating the internal structure of the installation cavity from the external space, preventing internal sparks or heat from contacting external flammable and explosive materials, and achieving a flameproof effect. On this basis, the main power terminal box 2 of the explosion-proof motor adopts an increased safety terminal box, and its multiple terminals are insulated from the box body 21, and the adjacent terminals 22 are further isolated by insulating isolation members 23, which effectively reduces the risk of arcs or sparks at the terminals 22, and the box body 21 is sealed and isolated from the external space, further improving safety. The explosion-proof motor with this structural design adopts a flameproof and increased safety composite explosion-proof method, which effectively improves the safety of the motor and solves the technical problem of insufficient safety of explosion-proof motors in related technologies.

[0027] In addition, the increased safety junction box can be designed with a certain short-circuit capacity and obtain a short-circuit capacity certificate issued by relevant national research institutions, which can better meet the needs of customers. Among them, the above-mentioned increased safety junction box is a type of junction box, that is, the junction box adopts an increased safety design. Increased safety is a type of explosion-proof electrical equipment structure, which means that a series of safety measures are adopted on the equipment, such as using high-quality insulating materials, reducing temperature rise, increasing electrical clearance, improving the quality of wire connection, etc., so that it will not generate electric sparks, arcs or dangerous temperatures to the maximum extent, or using effective protection components to prevent the sparks, arcs or temperatures generated by it from igniting explosive mixtures, so as to achieve the purpose of explosion-proof.

[0028] Specifically, the explosion-proof motor also includes a temperature measuring junction box 3 and a temperature measuring element, the temperature measuring junction box 3 is an increased safety junction box, the temperature measuring element is arranged in the motor body 1 to measure the temperature of the corresponding position, and the lead of the temperature measuring element is electrically connected to the temperature measuring terminal in the temperature measuring junction box; and / or, the explosion-proof motor also includes a heater junction box 4 and a heating element, the heater junction box is an increased safety junction box, the heating element is arranged in the motor body 1 to heat the stator winding, and the lead of the heating element is electrically connected to the heating terminal in the heater junction box 4.

[0029] According to actual needs, one or more temperature measuring elements can be set, and the setting position of the temperature measuring element can be flexibly selected according to the actual temperature measurement needs. For example, the temperature measuring element is set at the position corresponding to the bearing of the explosion-proof motor to measure the bearing temperature when the explosion-proof motor is working. For another example, the temperature measuring element is set at the position corresponding to the stator to measure the temperature of the stator when the explosion-proof motor is working. Of course, the temperature measuring element can also be set at any position with a large amount of heat, so as to monitor the heating conditions of the corresponding position, better understand the working conditions of the motor, and improve the safety of the motor.

[0030] By providing a heating element, the stator winding can be heated, thereby ensuring the dryness of the stator winding, thereby ensuring the reliability of its insulation and improving the safety of the motor operation.

[0031] When designing the above-mentioned temperature measuring element and / or heating element, by configuring it with an increased safety temperature measuring junction box 3 and / or an increased safety heater junction box 4, the safety of the heating element and / or the heating element wiring can be ensured, and the generation of electric sparks, arcs or dangerous temperatures at the wiring position can be avoided, thereby ensuring the safety of the motor operation.

[0032] Specifically, a pressure relief port is provided on the box body 21, and the main power connection box 2 includes a pressure relief plate 24, which blocks the pressure relief port. When the air pressure in the box body 21 reaches a preset air pressure, the pressure relief plate 24 ruptures under the action of the air pressure; the main power connection box 2 includes a shielding member 25, which is arranged on the outside of the box body 21, and the shielding member 25 shields at least part of the pressure relief port.

[0033] By designing the pressure relief sheet 24 to block the pressure relief port, when a short circuit or other fault occurs inside the box body 21, the arc ionizes the air, causing the gas inside the box body 21 to expand, and the pressure relief sheet 24 can be destroyed under the pressure, thereby releasing the pressure in time, avoiding explosion due to excessive pressure inside the box body 21, and improving the safety of the explosion-proof motor. By designing the shielding member 25 to shield the pressure relief port, the risk of the pressure relief sheet 24 being damaged by foreign objects can be reduced when the explosion-proof motor is in normal use.

[0034] Specifically, the main power junction box 2 also includes an auxiliary isolator 29, which is made of insulating material. The first end of each insulating isolator 23 is in contact with the inner wall of the box body 21, and the second end of each insulating isolator 23 is in contact with the auxiliary isolator 29, wherein the first end and the second end of the insulating isolator 23 are its opposite ends.

[0035] After adopting this structural design, the positions of each terminal 22 are separated into spaces with better independence by auxiliary isolators 29 and multiple insulating isolators 23, thereby improving the insulation performance, reducing the risk of arc formation, and ensuring the safety of the main power terminal box 2. In actual implementation, the material and shape of the insulating isolator 23 can be flexibly selected according to actual needs, as long as the insulation effect between the terminals 22 can be improved. In a specific embodiment, the insulating isolator 23 is an isolation plate made of insulating material. In this embodiment, multiple terminals 22 are arranged at intervals along the first direction, and multiple insulating isolators 23 are arranged at intervals along the first direction. The main power terminal box 2 also includes an auxiliary isolator 29, which is made of insulating material, and the auxiliary isolator 29 is connected to multiple insulating isolators 23. Preferably, the auxiliary isolator 29 is arranged between the multiple terminals 22 and the power line inlet, and multiple wire ports are arranged on the auxiliary isolator 29, and the positions of the multiple wire ports correspond to the positions of the multiple terminals 22. In a specific embodiment, the plurality of insulating spacers 23 are all extended along the second direction, and the auxiliary spacers 29 are extended along the first direction. Preferably, the first direction is perpendicular to the second direction.

[0036] Specifically, the machine base 11 includes: a machine base body 111, which is a hollow cylindrical structure; two end plates 112, which are installed at the opposite ends of the machine base body 111 in a one-to-one correspondence, and an installation cavity is formed between the machine base body 111 and the two end plates 112; wherein the machine base body 111 includes a bottom plate portion and an arc plate portion, the cross-sectional shape of the arc plate portion is an arc, and the bottom plate portion and the arc plate portion are connected as a whole.

[0037] That is to say, the machine base body 111 is not a complete cylinder, but a structure composed of an arc plate and a bottom plate, which is similar to a cylindrical structure with a part of the bottom cut off. The use of this leg-cut structure design makes the bottom plate part a better plane, which is convenient for clamping during the machine base turning and bottom plate grooving process. The machine base turning and bottom plate grooving can be achieved through one clamping, which can avoid repeated clamping operations and is beneficial to improving the processing efficiency of the machine base 11.

[0038] Specifically, the stator includes a stator core, which includes: a plurality of stator punchings, the surfaces of which are provided with reinforcing ribs; a plurality of stator ventilation slot plates, on which ventilation slots are provided along the radial direction of the explosion-proof motor, a plurality of stator punchings and a plurality of stator ventilation slot plates are stacked along the axial direction of the explosion-proof motor, and a plurality of stator punchings are provided between any two stator ventilation slot plates; a stator extrusion fixing piece, which is provided at the ends of a plurality of stator punchings along the axial direction of the explosion-proof motor, so as to extrude and fix the plurality of stator punchings through the stator extrusion fixing piece.

[0039] By designing reinforcing ribs on the surface of the stator punching sheet, the structural rigidity of the stator core can be effectively improved. Compared with the motor in the related art, the electromagnetic noise caused by the loose stator punching sheet can be avoided. After the reinforcing ribs are designed, the stator punching sheet is not easy to deform, and the tooth pressure plate structure at the end of the stator core can be eliminated, thereby releasing the pressure space at the end of the stator core, making it easier to ensure the size of the winding end, and helping to reduce the size of the motor. For example, by adopting this design of eliminating the tooth pressure plate, the two ends of the core of some products can be shortened by (25+16-10)*2=62mm, and the straight-line distance of the 10kV coil end can be shortened from 70mm to 40mm, thereby better achieving size control.

[0040] Specifically, the main part of the stator extrusion fixture is an annular structure, and a convex tooth is provided on the edge of the annular structure. The convex tooth is protruded toward the center side of the explosion-proof motor along the axial direction of the explosion-proof motor, and the convex tooth contacts the stator punching sheet at the end.

[0041] In this embodiment, the stator extrusion fixing piece adopts an annular structure with protruding teeth, which can be called a tooth pressure ring. Through the curved tooth structure surface, it can provide a greater clamping force for the stator punching sheet, thereby improving the clamping effect on the stator punching sheet.

[0042] Specifically, the rotor 12 includes a rotor shaft and a plurality of rotor punchings, the plurality of rotor punchings are stacked in sequence along the axial direction of the rotor shaft, each rotor punching is provided with an axial hole, the rotor shaft is a plain axis, the rotor shaft is passed through the axial holes of each rotor punching, and the rotor shaft and each rotor punching are connected by an interference fit; each rotor punching is provided with a rotor ventilation hole, the rotor ventilation holes of the plurality of rotor punchings constitute a rotor air duct, and the rotor air duct is extended along the axial direction of the rotor shaft.

[0043] The explosion-proof motor in this embodiment also has an upgraded rotor structure. Specifically, no keyway structure is used between the rotor core and the rotor shaft, and the rotor shaft does not use a welded rib shaft, but a smooth shaft, which is connected to the rotor core by interference fit. This does not require keyway processing, which is beneficial to improving processing efficiency and saving manufacturing costs. In addition, the smooth shaft has better uniformity, which can avoid the problem of uneven weld ribs of the welded rib shaft, reduce rotor imbalance, and thus avoid abnormal noise caused by rotor imbalance.

[0044] By designing rotor ventilation holes on the rotor punchings, the air circulation effect inside the rotor can be improved, the rotor ventilation cross-sectional area and cooling area can be larger, and the rotor heat dissipation effect can be improved.

[0045] The above-mentioned optical axis structure replaces the welded rib axis design, cancels the keyway design, and the rotor ventilation hole design. The rotor with air holes can play a role in adjusting the weight of the rotor. After using the optical axis, the axis is solid and can be appropriately thickened to adjust the weight of the rotor. In this way, the vibration characteristics of the rotor itself can be adjusted to adjust the critical speed, which is beneficial to improve the critical speed avoidance rate and make the explosion-proof motor work more smoothly. Among them, the critical speed is: the rotor will reach a resonance state at a specific speed (critical speed). At this time, the vibration of the motor is significantly increased, and the more the critical speed is avoided, the better. It has been confirmed in practice that after adopting the above scheme, the critical speed of the rigid rotor can be increased by 20-22%, and the flexible rotor can strictly control the critical speed between 60-80%, effectively improving the critical speed avoidance rate.

[0046] Specifically, the rotor 12 also includes two end plates, the thickness of the end plates is greater than the thickness of the rotor punchings, and along the axial direction of the rotor shaft, the two end plates are correspondingly arranged at both ends of the multiple rotor punchings to compress and fix the multiple rotor punchings through the two end plates.

[0047] By designing a thickened end plate at the end of the rotor 12, a better compaction effect can be achieved on the rotor punchings, avoiding expansion and bulging between the rotor punchings, and improving the stability of the rotor structure.

[0048] Specifically, the motor body 1 includes: an end cover 14, a rotor shaft avoidance hole is provided on the end cover 14, the rotor shaft is inserted into the rotor shaft avoidance hole, and the end cover 14 is connected to the end of the base 11; a water-throwing ring, the water-throwing ring is sleeved on the rotor shaft, and the water-throwing ring is located on the side of the end cover 14 close to the base 11; wherein, a first curved path structure is provided on the side of the end cover 14 facing the water-throwing ring, and a second curved path structure is provided on the side of the water-throwing ring facing the end cover 14, and the first curved path structure and the second curved path structure constitute a curved path labyrinth sealing structure.

[0049] By utilizing the first curved path structure on the end cover 14 and the second curved path structure on the water-slinging ring to form a curved path labyrinth sealing structure, the motor body 1 can be sealed and isolated from the external space. Compared with the contact rubber sealing method used in related technologies, it can reduce friction and noise, which is beneficial to ensuring the sealing effect and extending the life of the explosion-proof motor.

[0050] Specifically, a concave structure is provided on a side of the end cover 14 facing the base 11 , and / or a slope structure is provided on a side of the water slinger ring facing the end cover 14 .

[0051] By providing a recessed structure on the side of the end cover 14 facing the base 11, the grease storage cavity can be enlarged, thereby achieving a better lubrication effect and reducing the wear of the tortuous labyrinth seal structure. By providing an inclined surface structure on the side of the water-slinging ring facing the end cover 14, a better drainage effect can be achieved. When water enters the interior of the end cover 14 due to mechanical seal failure, it can generate a downward movement tendency under the action of the inclined surface after contacting the inclined surface of the water-slinging ring, thereby better draining the precipitation and preventing water from continuing to enter the interior of the explosion-proof motor. In actual implementation, in order to facilitate the injection of grease, the width of the waste grease outlet inside the motor body 1 can be appropriately increased.

[0052] In this embodiment, the motor body 1 includes a fixed bearing and a movable bearing, both of which are mounted on the base 11 and sleeved on the rotor shaft of the rotor 12, wherein, along the axial direction of the rotor shaft, the fixed bearing is arranged on the first side of the rotor core of the rotor 12, and the movable bearing is arranged on the second side of the rotor shaft of the rotor 12, and the movable bearing is movably arranged along the axial direction of the rotor shaft. Thus, through the movement of the movable bearing, the thermal expansion and contraction of the rotor shaft can be better adapted to ensure that the rotor 12 can rotate smoothly at different temperatures. Specifically, the motor body 1 also includes a preload spring, which contacts the movable bearing to apply a force to the outer ring of the movable bearing in the direction of the rotor core, so as to better fix the movable bearing, thereby reducing the wear or de-sleeving of the movable bearing due to the rotation of the outer ring of the bearing, and ensuring the stability of the motor operation. In actual implementation, the fixed bearing and the movable bearing can be various bearings, such as ball bearings, cylindrical bearings, etc., and the specific model and specification can be flexibly selected according to actual conditions. When the rotor shaft needs to withstand a large axial force (for example, the weight of a flywheel loaded on the shaft extension end of a reciprocating compressor), the fixed bearing includes multiple bearings, and spacers are arranged between adjacent bearings to increase the space for storing grease, improve the lubrication effect, and avoid heat generation at the contact point of the bearings.

[0053] In this embodiment, the base 11 includes a plurality of cooling pipes 113, which are arranged in the installation cavity of the base 11. The cooling pipes 113 are extended along the axial direction of the rotor shaft. The end plate 112 of the base 11 is provided with a plurality of avoidance holes, and the cooling pipes 113 are passed through the plurality of avoidance holes one by one. The number and diameter of the cooling pipes can be designed according to the actual heat dissipation requirements, for example, a cooling pipe 113 of φ25 is used. In a preferred embodiment, the diameter of the cooling pipe 113 is designed to be φ20, so that more cooling pipes 113 can be arranged in the base 11 on the basis of ensuring the air flow performance of the cooling pipe 113, thereby increasing the heat exchange area between the hot air inside the base 11 and the cold air outside the base 11, and improving the heat dissipation efficiency of the explosion-proof motor.

[0054] In a specific implementation, the rotor also includes an inner fan, which is mounted on the rotor shaft of the rotor 12, so that axial air supply is achieved as the rotor 12 rotates, thereby improving the air circulation effect in the rotor ventilation hole. After the heat at the rotor core is taken away by the air circulation inside the rotor, the hot air can be sent to the cooling pipe 113 through the ventilation slots of the stator ventilation slot plate, thereby exchanging heat with the external cold air to achieve heat dissipation of the motor. In actual implementation, the inner fan can be one or two. When there are two, they can be symmetrically arranged at opposite ends of the rotor core. In this embodiment, the inner fan is designed to be one. Compared with the double-sided air path design, this single-sided air path design is conducive to increasing the outer diameter of the inner fan, thereby improving the air circulation performance inside the rotor core, and then improving the heat dissipation efficiency. It has been proven in practice that the cooling effect of the rotor core is better with this single-sided air path design, and the temperature rise can be reduced by 5K to 10K.

[0055] In addition, in this embodiment, the explosion-proof motor is also upgraded by electromagnetic optimization. Some slots are set on the rotor punchings, and copper bars, aluminum bars and other structures are installed in the slots, and coils are added to the stator slots. By comparing test parameters, measuring shaft voltage, changing slot matching, measuring shaft voltage, and thus reducing shaft voltage, it is possible to avoid greater damage to the bearings due to excessive shaft voltage, slow down bearing wear, and reduce electromagnetic noise. Specifically, the number, position, size, shape, etc. of slots on the rotor and stator can be adjusted to optimize slot matching.

[0056] Preferably, the base 11 also includes a plurality of ribs, each of which is arranged to extend along the axial direction of the rotor shaft, and the two ends of the ribs are connected to the end plates 112 at the two ends of the base 11 in a one-to-one correspondence, and the ribs are connected to the inner wall of the base body 111. The plurality of ribs are arranged on the inner wall of the base body 111 at intervals along the circumference of the rotor shaft, thereby strengthening the structural strength of the base 11 and helping to reduce the vibration of the motor. In this embodiment, the number of ribs is designed to be 8, and the 8 ribs are evenly distributed. Compared with the rib arrangement method of using 10 or more ribs in the related art, it is possible to reduce the space occupied by the ribs on the basis of ensuring the structural strength of the base 11, and provide a larger installation space for the cooling pipe 113, which is conducive to further improving the heat dissipation effect of the explosion-proof motor.

[0057] The motor body 1 also includes a hood 5 and an external fan. The external fan is arranged on one side of the base 11 and connected to the rotor shaft. As the rotor shaft rotates, the air outside the base 11 is sent to the cooling pipe 113. The hood 5 is arranged on the external fan to provide protection. Among them, the hood 5 is provided with multiple air inlets, and the inside of the hood is provided with an air inlet curved path, which includes multiple curved sections, so as to achieve a resistive silencing effect. A silencing cotton structure can also be installed inside the hood to achieve a resistive silencing effect. Among them, the curved path structure can adopt a multi-curved path structure, such as a three-curved path or a two-curved path. Preferably, in this embodiment, the curved path structure adopts a two-curved path design, so as to reduce wind resistance while ensuring a good silencing effect, and is conducive to reducing manufacturing costs. The hood 5 includes a main body and a cover plate. The cover plate is detachably arranged at one end of the main body away from the base 11. By removing the cover plate, some operations can be more conveniently performed in the hood 5, such as adjusting the gap between the external fan and the air suction nozzle in the hood, measuring the shaft voltage, etc.

[0058] In some optional embodiments, the winding of the explosion-proof motor adopts an epoxy anhydride insulation structure, thereby improving the insulation performance, moisture resistance and anti-corona performance. On this basis, the main insulation thickness can be reduced from 2.6mm to 2.3mm (6kV), and from 4.9mm to 4.3mm (10kV), thereby improving the heat dissipation capacity of the coil. Preferably, the winding coil adopts a trapezoidal coil, thereby improving the uniformity of the end gap, improving the insulation quality, and reducing corona.

[0059] The main power terminal box 2 also includes an insulator 26, which is mounted on the box body 21, and the terminal 22 is mounted on the insulator 26, so that the box body 21 and the terminal 22 are insulated and connected through the insulator 26. In a specific embodiment, the insulator 26 is a ceramic insulator. Of course, it can also be an insulator of other types and structures. Preferably, a terminal box mounting seat 13 is provided on the motor body 1, and the insulator 26 is mounted on the terminal box mounting seat 13, so as to provide a stable support for the insulator 26, thereby ensuring the stability of the installation of the terminal 22.

[0060] In addition, in the present embodiment, a power cord inlet is provided on the box body 21 of the main power connection box 2, and a power cord for supplying power to the explosion-proof motor is inserted into the box body 21 through the power cord inlet. The main power connection box 2 also includes a sealing ring 27 and a sealing ring clamping assembly 28. The sealing ring is arranged at the power cord inlet for the power cord to pass through. The sealing ring clamping assembly 28 presses the sealing ring to make the sealing ring 27 and the power cord in squeeze contact, so that the sealing ring can effectively seal the gap between the box body 21 and the power cord, thereby improving the safety of the main power connection box 2.

[0061] In a specific embodiment, the sealing ring pressing assembly 28 includes a first component 281 and a second component 282, the first component 281 has a first channel running through it, a protrusion protruding toward the inside of the first channel is provided in the first channel, the second component 282 has a second channel running through it, the first component 281 is installed at the entrance of the power cord, the sealing ring 27 is provided in the first channel, at least part of the second component 282 is inserted into the first channel, the sealing ring 27 is deformed under the extrusion of the protrusion in the first channel and the second component 282, so as to fit more closely with the power cord. Preferably, a first sealing pad is provided between the first component 281 and the box body 21.

[0062] Preferably, the main power connection box 2 further includes a harness fixing member 20, which is disposed between the power line inlet and the auxiliary isolating member 29, and is fixedly connected to the box body 21, so as to fix the harness of the power line through the harness fixing member 20. In actual implementation, the harness fixing member 20 can be various forms of components that can play a fixing role, such as a wire clip, a cable tie, etc.

[0063] In order to facilitate the wiring, disconnection or maintenance of the main power line, in this embodiment, the box body 21 of the main power connection box 2 includes a box body 211 and a box cover 212. The box body 211 is provided with a groove, and the connection terminal 22 is installed in the groove. The box cover 212 is detachably installed on the box body 211, and a closed space is enclosed between the box cover 212 and the box body 211. Preferably, a second sealing gasket is provided between the box body 211 and the box cover 212.

[0064] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0065] The explosion-proof motor of the embodiment of the utility model includes: a motor body 1, the motor body 1 includes a base 11, a stator and a rotor 12, the base 11 has an installation cavity, the stator is fixedly arranged in the installation cavity, the rotor core of the rotor 12 is rotatably arranged in the installation cavity, the rotor shaft of the rotor 12 extends out of the installation cavity, and the installation cavity is sealed and isolated from the external space of the motor body 1; a main power terminal box 2, the main power terminal box 2 is an increased safety terminal box, the main power terminal box 2 includes a box body 21, a plurality of wiring terminals 22 and a plurality of insulating isolation members 23, the plurality of wiring terminals 22 are conductively connected to the windings of the stator, the plurality of wiring terminals 22 are fixedly arranged in the box body 21, the wiring terminals 22 and the box body 21 are insulated, one or more insulating isolation members 23 are arranged between any two wiring terminals 22, and the internal space of the box body 21 is sealed and isolated from the external space of the box body 21. In the explosion-proof motor with this structural design, the internal installation cavity of the base 11 is sealed and isolated from the external space of the motor body 1, thereby isolating the internal structure of the installation cavity from the external space, preventing internal sparks or heat from contacting external flammable and explosive materials, and achieving a flameproof effect. On this basis, the main power terminal box 2 of the explosion-proof motor adopts an increased safety terminal box, and its multiple terminals are insulated from the box body 21, and the adjacent terminals 22 are further isolated by insulating isolation members 23, which effectively reduces the risk of arcs or sparks at the terminals 22, and the box body 21 is sealed and isolated from the external space, further improving safety. The explosion-proof motor with this structural design adopts a flameproof and increased safety composite explosion-proof method, which effectively improves the safety of the motor and solves the technical problem of insufficient safety of explosion-proof motors in related technologies.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An explosion-proof motor, characterized in that: include: A motor body (1), the motor body (1) comprising a base (11), a stator and a rotor (12), the base (11) having a mounting cavity, the stator being fixedly disposed in the mounting cavity, a rotor core of the rotor (12) being rotatably disposed in the mounting cavity, a rotor shaft of the rotor (12) extending out of the mounting cavity, and the mounting cavity being sealed and isolated from an external space of the motor body (1); A main power connection box (2), the main power connection box (2) being an increased safety connection box, the main power connection box (2) comprising a box body (21), a plurality of connection terminals (22) and a plurality of insulating spacers (23), the plurality of connection terminals (22) being conductively connected to the windings of the stator, the plurality of connection terminals (22) being fixedly arranged in the box body (21), the connection terminals (22) being insulated from the box body (21), one or more insulating spacers (23) being arranged between any two of the connection terminals (22), and the internal space of the box body (21) being sealed and isolated from the external space of the box body (21).

2. The explosion-proof motor according to claim 1, characterized in that: The explosion-proof motor further comprises a temperature measuring junction box (3) and a temperature measuring element, wherein the temperature measuring junction box (3) is an increased safety junction box, the temperature measuring element is arranged on the motor body (1) to measure the temperature at a corresponding position, and the lead wire of the temperature measuring element is electrically connected to the temperature measuring terminal in the temperature measuring junction box; and / or, The explosion-proof motor further comprises a heater junction box (4) and a heating element, wherein the heater junction box is an increased safety junction box, the heating element is arranged on the motor body (1) to heat the stator winding, and the lead wires of the heating element are electrically connected to the heating terminal in the heater junction box (4).

3. The explosion-proof motor according to claim 1, characterized in that: The box body (21) is provided with a pressure relief port, the main power connection box (2) comprises a pressure relief plate (24), the pressure relief plate (24) blocks the pressure relief port, and when the air pressure in the box body (21) reaches a preset air pressure, the pressure relief plate (24) ruptures under the action of the air pressure; the main power connection box (2) comprises a shielding member (25), the shielding member (25) is arranged on the outside of the box body (21), and the shielding member (25) shields at least part of the pressure relief port.

4. The explosion-proof motor according to claim 1, characterized in that: The main power connection box (2) further comprises an auxiliary isolating piece (29), wherein the auxiliary isolating piece (29) is made of an insulating material, wherein the first end of each of the insulating isolating pieces (23) contacts the inner wall of the box body (21), and the second end of each of the insulating isolating pieces (23) contacts the auxiliary isolating piece (29), wherein the first end and the second end of the insulating isolating piece (23) are opposite ends thereof.

5. The explosion-proof motor according to any one of claims 1 to 4, characterized in that: The base (11) comprises: A machine base body (111), wherein the machine base body (111) is a hollow cylindrical structure; Two end plates (112), the two end plates (112) being mounted on opposite ends of the machine base body (111) in a one-to-one correspondence, and the machine base body (111) and the two end plates (112) forming the mounting cavity; The base body (111) comprises a bottom plate portion and an arc plate portion, the arc plate portion has a cross-sectional shape of an arc, and the bottom plate portion and the arc plate portion are connected as a whole.

6. The explosion-proof motor according to any one of claims 1 to 4, characterized in that: The stator comprises a stator core, and the stator core comprises: A plurality of stator punching sheets, wherein the surfaces of the stator punching sheets are provided with reinforcing ribs; A plurality of stator ventilation slot plates, each of which is provided with ventilation slots arranged along the radial direction of the explosion-proof motor, a plurality of stator punchings and a plurality of stator ventilation slot plates are stacked and arranged along the axial direction of the explosion-proof motor, and a plurality of stator punchings are arranged between any two of the stator ventilation slot plates; A stator extrusion fixing piece is arranged at the ends of the plurality of stator punching sheets along the axial direction of the explosion-proof motor so as to extrude and fix the plurality of stator punching sheets through the stator extrusion fixing piece.

7. The explosion-proof motor according to claim 6, characterized in that: The main part of the stator extrusion fixing piece is an annular structure, and a convex tooth is provided on the edge of the annular structure. Along the axial direction of the explosion-proof motor, the convex tooth is protruded toward the center side of the explosion-proof motor, and the convex tooth contacts the stator punching sheet located at the end.

8. The explosion-proof motor according to any one of claims 1 to 4, characterized in that: The rotor (12) comprises a rotor shaft and a plurality of rotor punchings, wherein the plurality of rotor punchings are stacked in sequence along the axial direction of the rotor shaft, each of the rotor punchings is provided with an axial hole, the rotor shaft is a plain shaft, the rotor shaft is passed through the axial hole of each of the rotor punchings, and the rotor shaft and each of the rotor punchings are connected by an interference fit; Each of the rotor punchings is provided with a rotor ventilation hole, and the rotor ventilation holes of a plurality of the rotor punchings form a rotor air duct, and the rotor air duct is extended along the axial direction of the rotor shaft.

9. The explosion-proof motor according to claim 8, characterized in that: The rotor (12) further comprises two end plates, the thickness of the end plates being greater than the thickness of the rotor punchings, and along the axial direction of the rotor shaft, the two end plates are correspondingly arranged at both ends of the plurality of rotor punchings so as to compress and fix the plurality of rotor punchings through the two end plates.

10. The explosion-proof motor according to any one of claims 1 to 4, characterized in that: The motor body (1) comprises: An end cover (14), wherein the end cover (14) is provided with a rotor shaft avoidance hole, the rotor shaft is inserted into the rotor shaft avoidance hole, and the end cover (14) is connected to an end of the machine base (11); A water-slinging ring, the water-slinging ring being sleeved on the rotor shaft and being located on a side of the end cover (14) close to the machine base (11); Wherein, a first curved path structure is provided on the side of the end cover (14) facing the water-slinging ring, and a second curved path structure is provided on the side of the water-slinging ring facing the end cover (14), and the first curved path structure and the second curved path structure form a curved path labyrinth sealing structure.

11. The explosion-proof motor according to claim 10, characterized in that: A concave structure is provided on a side of the end cover (14) facing the machine base (11), and / or a slope structure is provided on a side of the water slinger ring facing the end cover (14).

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