Explosion-proof cavity structure of explosion-proof external rotor motor

Abstract

The invention discloses a flame-proof cavity structure of a flame-proof type explosion-proof outer rotor motor, and belongs to the technical field of outer rotor motors, the flame-proof cavity structure comprises a shell, the inner side and the outer side of the shell are jointly provided with an arc extinguishing component, the arc extinguishing component comprises a detachably mounted tray, an outer rotor is rotatably connected above the tray, the lower side of a permanent magnet is lapped on the upper side of the tray, and the outer rotor is connected with the permanent magnet. The permanent magnet and the outer rotor are wrapped by the shell made of steel, a first brim is fixedly connected to the upper side of the outer surface of the shell, a second brim is fixedly connected to the lower side of the outer surface of the shell, and a supporting frame is connected between the second brim and the tray in a clamped mode. Therefore, stable operation of the permanent magnet and the outer rotor is guaranteed, electric arcs generated in the operation process can be dissipated between the tray and the second brim in the moving process, the electric arcs are prevented from becoming an ignition source, and the explosion-proof performance of the outer rotor motor is further guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of outer rotor motor, more particularly, to a flameproof explosion-proof outer rotor motor explosion-proof cavity structure. BACKGROUND

[0002] The outer rotor motor is a special type of motor, and the unique feature of the outer rotor motor is that the outer rotor is located on the outside, while the permanent magnet is located on the inside. The outer rotor is a circular ring structure. The working principle of the outer rotor motor is to use the magnetic field generated by the permanent magnet to generate torque, thereby driving the outer rotor to rotate. The movement direction of the outer rotor is opposite to the direction of the magnetic field, so the outer rotor motor also has a high braking torque.

[0003] The low-speed characteristics of the outer rotor motor make it particularly suitable for application scenarios that require large torque. When the size of the motor is the same, the torque of the outer rotor is usually proportional to D 2 L(D is the diameter of the outer rotor, and L is the axial length), and the outer rotor can generate large torque at low speed. Due to its low-speed large-torque characteristics, the outer rotor motor is widely used in various occasions that require direct drive or constant speed and require small speed change, such as electric vehicles, drones, robots, etc. Although the outer rotor motor has many advantages, its heat dissipation and control precision are relatively high.

[0004] In the prior art, since the outer rotor motor is applied to a mine field or an environment with explosive gas, steam, dust or fibers, the motor can generate electric arc, spark or high temperature under normal operation or fault condition. These can all become ignition sources to ignite explosive mixtures. If the temperature of the motor housing is too high or the spark cannot be properly suppressed, an explosion or fire can occur, which poses a great safety hazard. SUMMARY

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a flameproof explosion-proof outer rotor motor explosion-proof cavity structure.

[0006] To solve the above problems, the present application adopts the following technical scheme, which can dissipate the electric arc generated during the operation of the outer rotor motor in the moving process between the tray and the second brim, thereby avoiding the electric arc becoming an ignition source.

[0007] A flameproof explosion-proof outer rotor motor explosion-proof cavity structure, comprising a shell and a permanent magnet arranged inside the shell, wherein the inside of the shell is provided with an outer rotor, the upper part of the shell is provided with a flange plate, the permanent magnet is wrapped outside the outer rotor, and the inner and outer sides of the shell are provided with arc extinguishing components in common.

[0008] The arc extinguishing component includes a detachable mounting tray, the outer rotor is rotationally connected above the tray, the lower side of the permanent magnet is overlapped on the upper side of the tray, the upper side of the shell outer surface is fixedly connected with a first brim, the lower side of the shell outer surface is fixedly connected with a second brim, a support frame is clamped between the second brim and the tray, a plurality of bolts are arranged in a rectangular array on the upper side of the second brim, a first positioning groove is formed in the second brim, and a first movable plate is slidably connected in the first positioning groove.

[0009] Further, the outer rotor penetrates the flange plate, the bolt penetrates the tray and the second brim, the diameter of the tray is the same as the outer diameter of the first brim and the second brim, and the shape of the first positioning groove is matched with the shape of the first movable plate.

[0010] Further, the first brim and the second brim are made of 5mm thick steel material, the radial depth of the first brim and the second brim is greater than or equal to 30mm, and the distance between the second brim and the tray is less than or equal to 3mm.

[0011] Further, the outer side of the shell is provided with an extension assembly, the extension assembly includes a first corrugated strip arranged in a ring array and fixedly connected.

[0012] Further, the upper side of the tray is provided with a second positioning groove, a second movable plate is slidably connected in the second positioning groove, a second corrugated strip is fixedly connected to the upper side of the second movable plate in a ring array, and the opposite surfaces of the first movable plate and the second movable plate are overlapped on the upper and lower sides of the support frame.

[0013] Further, the first corrugated strip and the second corrugated strip are arranged in a staggered manner, the support frame is wrapped outside the first corrugated strip and the second corrugated strip, and the shape of the second positioning groove is matched with the shape of the second movable plate.

[0014] Further, the outer side of the shell is provided with a locking assembly, the locking assembly includes a positioning cylinder arranged in a ring array and fixedly connected to the upper side of the first movable plate.

[0015] Further, a screw is threadedly connected to the upper side of the positioning cylinder, a through hole is formed in the upper side of the second brim in a ring array, the positioning cylinder is slidably connected inside the through hole, the screw is overlapped on the upper side of the second brim after moving downward, the diameter of the screw driving end is greater than the diameter of the through hole, and the support frame is between the first movable plate and the second movable plate.

[0016] Further, the inner and outer sides of the tray are provided with a heat dissipation component, a plurality of heat dissipation fins are fixedly connected to the lower side of the heat dissipation component in a transverse linear array.

[0017] Further, the upper side center of the tray is provided with a ring-shaped array of flow guide holes, the flow guide holes penetrate the tray, and the inside of the tray is provided with a filter screen.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] (1) The gap between the second brim and the tray accelerates the dissipation of the electric arc. Since the permanent magnet and the outer rotor are wrapped by the shell made of steel, the permanent magnet and the outer rotor can stably operate. The electric arc generated during operation is dissipated between the tray and the second brim during movement, avoiding the electric arc becoming an ignition source, thereby ensuring the explosion-proof performance of the outer rotor motor.

[0020] (2) The first and second corrugated strips accelerate the dissipation of the electric arc. When the electric arc enters between the second brim and the tray, it directly contacts the first and second corrugated strips, and the corrugated structure provides more heat dissipation area and collision opportunities, which helps to accelerate the recombination and neutralization of charged particles in the electric arc, further reducing the conductivity of the electric arc and accelerating its extinction process.

[0021] (3) The positioning cylinder and screw lock the first movable plate in the first positioning groove. Since the first movable plate fixes the first corrugated strip and the second movable plate fixes the second corrugated strip, the first and second movable plates are always inside the gap between the second brim and the tray after the tray and the shell are connected, thereby ensuring the arc extinguishing efficiency of the electric arc. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the present application;

[0023] Figure 2 is a sectional view of the present application;

[0024] Figure 3 is a sectional view of the first brim of the present application;

[0025] Figure 4 is a sectional view of the tray of the present application;

[0026] Figure 5 is a sectional view of the second brim of the present application;

[0027] Figure 6 is a sectional view of the support frame of the present application;

[0028] Figure 7 is a structural schematic diagram of the second corrugated strip of the present application;

[0029] Figure 8A cross-sectional structure of the first positioning groove of the application.

[0030] Explanation of reference numerals in the drawing:

[0031] 1, shell; 11, permanent magnet; 12, outer rotor; 13, flange plate; 2, arc extinguishing component; 21, tray; 22, first brim; 23, second brim; 24, support frame; 25, bolt; 26, first positioning groove; 27, first movable plate; 28, extension assembly; 281, first corrugated strip; 282, second positioning groove; 283, second movable plate; 284, second corrugated strip; 29, locking assembly; 291, positioning cylinder; 292, screw; 293, through hole; 3, heat dissipation component; 31, heat dissipation fin; 32, flow guide hole; 33, filter screen. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0033] Please refer to Figures 1 to 8 An explosion-proof outer rotor motor explosion-proof cavity structure, comprising a shell 1 and a permanent magnet 11 arranged inside the shell 1, the inside of the shell 1 is provided with an outer rotor 12, the upper part of the shell 1 is provided with a flange plate 13, the permanent magnet 11 is wrapped outside the outer rotor 12, and the inner and outer sides of the shell 1 are jointly provided with an arc extinguishing component 2.

[0034] The arc extinguishing component 2 comprises a detachable tray 21, the outer rotor 12 is rotationally connected above the tray 21, the lower side of the permanent magnet 11 is lapped on the upper side of the tray 21, the upper side of the outer surface of the shell 1 is fixedly connected with a first brim 22, the lower side of the outer surface of the shell 1 is fixedly connected with a second brim 23, a support frame 24 is clamped between the second brim 23 and the tray 21, the upper side of the second brim 23 is arranged in a rectangular array and is provided with bolts 25, and the inside of the second brim 23 is provided with a first positioning groove 26, and the inside of the first positioning groove 26 is slidably connected with a first movable plate 27.

[0035] The outer rotor 12 penetrates the flange plate 13, the bolts 25 penetrate the tray 21 and the second brim 23, the diameter of the tray 21 is the same as the outer diameter of the first brim 22 and the second brim 23, and the shape of the first positioning groove 26 is matched with the shape of the first movable plate 27.

[0036] The first brim 22 and the second brim 23 are made of 5mm thick steel material, the radial depth of the first brim 22 and the second brim 23 is greater than or equal to 30mm, and the distance between the second brim 23 and the tray 21 is less than or equal to 3mm.

[0037] By adopting the technical scheme, after the permanent magnet 11 is installed inside the shell 1, the tray 21 arranged below the shell 1 supports the permanent magnet 11, meanwhile, the lower end of the outer rotor 12 arranged inside the shell 1 is arranged on the upper side of the tray 21, and the output shaft penetrates the shell 1 and the flange plate 13, when an electric arc occurs in the running process of the shell 1, the electric arc spreads in all directions, because the support frame 24 is arranged between the tray 21 and the second brim 23, the distance between the second brim 23 and the tray 21 is less than or equal to 3mm, and the first brim 22 and the second brim 23 and the shell 1 are made of 5mm thick steel material, so that the electric arc will enter between the tray 21 and the second brim 23 after being generated, when the electric arc enters the gap between the tray 21 and the second brim 23, the electric arc contacts the wall of the gap, so that the heat of the electric arc is rapidly dissipated to the surrounding environment through heat conduction and convection, reducing the temperature of the electric arc, meanwhile, the electric arc is subjected to the collision action of the electric field force and the gas molecules, the charged particles such as electrons and ions in the electric arc recombine with neutral particles to form neutral particles or molecules, this process is called deionization, reducing the number of charged particles in the electric arc, so that the electric arc gradually dissipates, because the permanent magnet 11 and the outer rotor 12 are wrapped by the shell 1 made of steel material, the stable operation of the permanent magnet 11 and the outer rotor 12 is ensured, and the electric arc generated in the running process will dissipate between the tray 21 and the second brim 23 in the running process, avoiding that the electric arc becomes an ignition source, thereby ensuring the explosion-proof performance of the outer rotor 12 motor.

[0038] As shown in Figures 4 to 7 The outer side of the shell 1 is provided with an extension assembly 28, the extension assembly 28 includes first corrugated strips 281 arranged and fixed in a ring array.

[0039] The upper side of the tray 21 is provided with a second positioning groove 282, the second positioning groove 282 is slidably connected with a second movable plate 283, the upper side of the second movable plate 283 is fixedly connected with second corrugated strips 284 arranged in a ring array, and the opposite surfaces of the first movable plate 27 and the second movable plate 283 are respectively overlapped on the upper and lower sides of the support frame 24.

[0040] The first corrugated strips 281 and the second corrugated strips 284 are arranged in a staggered manner, the support frame 24 is wrapped on the outer sides of the first corrugated strips 281 and the second corrugated strips 284, and the shape of the second positioning groove 282 is matched with the shape of the second movable plate 283.

[0041] By adopting the above technical scheme, when the tray 21 and the second brim 23 are fixed on the upper and lower sides of the support frame 24, because the first movable plate 27 is arranged in the first positioning groove 26 opened on the surface of the second brim 23, the second movable plate 283 is arranged in the second positioning groove 282 on the upper side of the tray 21, and the first corrugated strip 281 and the second corrugated strip 284 are arranged in a staggered manner between the first movable plate 27 and the second movable plate 283, when the electric arc enters between the second brim 23 and the tray 21, the electric arc will pass through the first corrugated strip 281 and the second corrugated strip 284. The corrugated structure can increase the distance that the electric arc needs to cross, that is, the creepage distance. A longer creepage distance means that the electric arc needs more energy to maintain its conductivity. At the same time, in the corrugated gap, it is difficult for the electric arc to form a continuous conductive channel. This is because the corrugated structure makes the electric arc need to change direction constantly during movement, increasing the collision and heat dissipation opportunities between the electric arc and the gap wall, making the electric arc more likely to undergo the deionization process. Since the electric arc enters between the second brim 23 and the tray 21 and directly contacts the first corrugated strip 281 and the second corrugated strip 284, and the corrugated structure provides more heat dissipation area and collision opportunities, it helps to accelerate the recombination and neutralization of charged particles in the electric arc, further reducing the conductivity of the electric arc and accelerating the extinguishing process of the electric arc.

[0042] As shown in Figures 1 to 2 and Figure 4 , Figure 5 and Figure 7 , the outer side of the shell 1 is provided with a locking assembly 29, and the locking assembly 29 includes a positioning cylinder 291 fixedly connected in an annular array on the upper side of the first movable plate 27.

[0043] The upper side of the positioning cylinder 291 is threadedly connected with a screw 292, and the upper side of the second brim 23 is provided with through holes 293 arranged in an annular array. The positioning cylinder 291 is slidingly connected inside the through holes 293, and the screw 292 is lapped on the upper side of the second brim 23 after being moved downward. The diameter of the screw 292 at the tightening end is greater than the diameter of the through hole 293, and the support frame 24 is between the first movable plate 27 and the second movable plate 283.

[0044] By adopting the above technical scheme, in the process of installing the first movable plate 27 inside the second brim 23, the positioning cylinder 291 above the first movable plate 27 can be inserted into the through hole 293 inside the second brim 23, then the screw 292 is inserted into the positioning cylinder 291 from above the second brim 23, and the screw 292 is screwed, because the shape and diameter of the screwing end of the screw 292 are larger than the diameter of the through hole 293, so that after the screw 292 is fixed with the positioning cylinder 291, the positioning cylinder 291 cannot be separated from the inside of the through hole 293, then the second movable plate 283 is placed inside the second positioning groove 282 above the tray 21, after the tray 21 is butted with the permanent magnet 11, the support frame 24 between the first movable plate 27 and the second movable plate 283 will extrude the second movable plate 283, so that the second movable plate 283 is limited inside the second positioning groove 282, at the same time, the support frame 24 pushes the first movable plate 27, so that the first movable plate 27 is pushed into the second positioning groove 282, at this time the positioning cylinder 291 will move inside the through hole 293, because the first movable plate 27 fixes the first corrugated strip 281, and the second movable plate 283 fixes the second corrugated strip 284, so that after the tray 21 is butted with the shell 1, it can be guaranteed that the first movable plate 27 and the second movable plate 283 are always inside the gap between the second brim 23 and the tray 21, thereby guaranteeing the arc extinguishing efficiency of the arc.

[0045] As shown in Figure 3 and Figure 8 , the inner and outer sides of the tray 21 are provided with a heat dissipation component 3, and the lower side of the heat dissipation component 3 is fixedly connected with a plurality of heat dissipation fins 31 arranged in a transverse linear array.

[0046] The upper side of the tray 21 is provided with a flow guide hole 32 arranged in a ring shape, the flow guide hole 32 penetrates the tray 21, and the inside of the tray 21 is provided with a filter screen 33.

[0047] By adopting the above technical scheme, the heat accumulated in the shell 1 will gradually enter the tray 21 through the flow guide hole 32 during operation, and then be discharged from the shell 1 after passing through the filter screen 33, at the same time, the heat sink 31 is in close contact with the tray 21, and the heat generated in the shell 1 is transmitted to the heat sink 31 and each part of the heat sink 31 by heat conduction, and the heat dissipation effect is enhanced by increasing the surface area, when the heat sink 31 is heated, the surface temperature of the heat sink 31 will rise, and the temperature difference between the heat sink 31 and the surrounding environment will cause the surrounding air to flow, thereby taking away the heat on the heat sink 31. Since the heat accumulated in the shell 1 will be dissipated through the heat sink 31, the temperature of the arc will be reduced, which helps to accelerate the deionization process of the arc, that is, the process of combining charged particles in the arc with neutral particles to form neutral particles, which will reduce the number of charged particles in the arc, thereby reducing the conductivity of the arc, making the arc more easily extinguished, and preventing the arc from reigniting due to temperature rise.

[0048] Working principle: after the permanent magnet 11 is installed in the shell 1, the tray 21 arranged below the shell 1 will support the permanent magnet 11, at the same time, the outer rotor 12 arranged inside the shell 1 is arranged on the upper side of the tray 21, and the output shaft penetrates the shell 1 and the flange plate 13, when the arc appears in the shell 1 during operation, the arc extends in all directions, when the arc enters the gap between the tray 21 and the second brim 23, the arc contacts the gap wall, so that the heat of the arc is quickly dissipated to the surrounding environment through heat conduction and convection, so that the arc gradually dissipates, at the same time, since the tray 21 and the second brim 23 are arranged on the upper and lower sides of the support frame 24, the first movable plate 27 in the first positioning slot 26 is fixed with the first corrugated strip 281 on the lower side, the second movable plate 283 in the second positioning slot 282 is fixed with the second corrugated strip 284 on the upper side, so that when the arc enters between the second brim 23 and the tray 21, the arc will pass through the first corrugated strip 281 and the second corrugated strip 284. The corrugated structure can increase the distance that the arc needs to cross, and in the corrugated gap, it is difficult for the arc to form a continuous conductive channel, and during the installation of the first movable plate 27 in the second brim 23, the positioning cylinder 291 above the first movable plate 27 is inserted into the through hole 293 inside the second brim 23, then the screw 292 is inserted into the positioning cylinder 291 from above the second brim 23, and the screw 292 is twisted, because the shape of the screw 292 is larger in diameter than the diameter of the through hole 293, the positioning cylinder 291 cannot be separated from the through hole 293, if the heat accumulated in the shell 1 will gradually enter the tray 21 through the flow guide hole 32, then be discharged from the shell 1 after passing through the filter screen 33, at the same time, the heat sink 31 is in close contact with the tray 21, and the heat generated in the shell 1 is transmitted to the heat sink 31 and each part of the heat sink 31 by heat conduction, and the heat dissipation effect is enhanced by increasing the surface area, when the heat sink 31 is heated, the surface temperature of the heat sink 31 will rise, and the temperature difference between the heat sink 31 and the surrounding environment will cause the surrounding air to flow, thereby taking away the heat on the heat sink 31. Since the heat accumulated in the shell 1 will be dissipated through the heat sink 31, the temperature of the arc will be reduced, which helps to accelerate the deionization process of the arc, that is, the process of combining charged particles in the arc with neutral particles to form neutral particles, which will reduce the number of charged particles in the arc, thereby reducing the conductivity of the arc, making the arc more easily extinguished, and preventing the arc from reigniting due to temperature rise.

[0049] The above description is only the preferred embodiment of the present application; the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent substitutions or changes according to the technical solution and the improvement concept of the present application within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An explosion-proof outer rotor motor explosion-proof chamber structure, comprising a shell (1) and a permanent magnet (11) arranged inside the shell (1), wherein the inside of the shell (1) is provided with an outer rotor (12), and the upper part of the shell (1) is provided with a flange plate (13), and the permanent magnet (11) is wrapped outside the outer rotor (12), characterized in that: The inner and outer sides of the shell (1) are provided with arc extinguishing components (2) together; ​ The arc extinguishing component (2) comprises a detachable tray (21), the outer rotor (12) is rotatably connected above the tray (21), the lower side of the permanent magnet (11) is overlapped on the upper side of the tray (21), the upper side of the outer surface of the shell (1) is fixedly connected with a first brim (22), the lower side of the outer surface of the shell (1) is fixedly connected with a second brim (23), a supporting frame (24) is clamped between the second brim (23) and the tray (21), a plurality of bolts (25) are arranged in a rectangular array on the upper side of the second brim (23), a first positioning groove (26) is formed in the second brim (23), and a first movable plate (27) is slidably connected in the first positioning groove (26).

2. The structure of the explosion-proof chamber of the explosion-proof outer rotor motor according to claim 1, characterized in that: The outer rotor (12) penetrates the flange plate (13), the bolt (25) penetrates the tray (21) and the second brim (23), the diameter of the tray (21) is the same as the outer diameter of the first brim (22) and the second brim (23), and the shape of the first positioning groove (26) is matched with the shape of the first movable plate (27).

3. The structure of the explosion-proof chamber of the explosion-proof outer rotor motor according to claim 1, characterized in that: The first brim (22), the second brim (23) and the shell (1) are all made of 5mm thick steel material, the radial depth of the first brim (22) and the second brim (23) is greater than or equal to 30mm, and the distance between the second brim (23) and the tray (21) is less than or equal to 3mm.

4. The structure of the explosion-proof chamber of the explosion-proof external rotor motor according to claim 1, characterized in that: The outer side of the shell (1) is provided with an extension assembly (28), and the extension assembly (28) comprises a first corrugated strip (281) arranged in an annular array and fixedly connected.

5. The flameproof explosion-proof outer rotor motor flameproof chamber structure according to claim 4, characterized in that: The upper side of the tray (21) is provided with a second positioning groove (282), the second positioning groove (282) is slidably connected with a second movable plate (283), the upper side of the second movable plate (283) is fixedly connected with a second corrugated strip (284) arranged in an annular array, and the opposite surfaces of the first movable plate (27) and the second movable plate (283) are overlapped on the upper and lower sides of the supporting frame (24).

6. The flameproof explosion-proof outer rotor motor flameproof chamber structure according to claim 5, characterized in that: The first corrugated strip (281) and the second corrugated strip (284) are arranged in a staggered manner, the supporting frame (24) is wrapped on the outer sides of the first corrugated strip (281) and the second corrugated strip (284), and the shape of the second positioning groove (282) is matched with the shape of the second movable plate (283).

7. The structure of the explosion-proof chamber of the explosion-proof outer rotor motor of claim 1, characterized in that: The outer side of the shell (1) is provided with a locking assembly (29), and the locking assembly (29) comprises a positioning cylinder (291) fixedly connected on the upper side of the first movable plate (27) and arranged in an annular array.

8. The flameproof explosion-proof outer rotor motor flameproof chamber structure according to claim 7, characterized in that: The upper side of the positioning tube (291) is threadedly connected to a screw (292), and the upper side of the second brim (23) is provided with through holes (293) arranged in a ring array. The positioning tube (291) is slidably connected inside the through hole (293), and the screw (292) is overlapped on the upper side of the second brim (23) after moving downward. The diameter of the screwing end of the screw (292) is larger than the diameter of the through hole (293), and the support frame (24) is located between the first movable plate (27) and the second movable plate (283).

9. The flameproof explosion-proof outer rotor motor flameproof chamber structure according to claim 1, characterized in that: The inner and outer sides of the tray (21) are both provided with heat dissipation components (3), and the lower side of the heat dissipation component (3) is fixedly connected with heat dissipation fins (31) arranged in a transverse linear array.

10. The flameproof explosion-proof outer rotor motor flameproof chamber structure according to claim 9, characterized in that: The center of the upper side of the tray (21) is provided with guide holes (32) arranged in a circular array. The guide holes (32) pass through the tray (21). A filter screen (33) is provided inside the tray (21).

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