Electric sand-ejecting blower

Abstract

The application discloses an electric sand discharging blower, which comprises an air inlet structure with open ends, an integrated rear machine case and a permanent magnet motor. The rear machine case comprises a fixed shell with open ends and an annular body. The fixed shell is connected with the air inlet structure at one end. The annular body and the permanent magnet motor are sequentially arranged in the fixed shell along the air inlet structure. A plurality of flow guide plates close to the inner wall of the fixed shell are circumferentially arranged on the annular body. Adjacent flow guide plates and the inner wall of the fixed shell form an inverted curvature outlet flow channel. The air inlet structure is connected with the permanent magnet motor. The connecting end of the air inlet structure and the permanent magnet motor is located in the annular body. The air inlet structure is communicated with the outlet flow channel. The air inlet structure with open ends and the outlet flow channel are used to cool the permanent magnet motor in a closed space, and an additional cooling device is not needed. The system weight is reduced, and the system efficiency and reliability are improved. In addition, the air inlet inclined flow channel and the outlet flow channel are arranged, so that the integrated structure is compact, and the space utilization rate is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air blower, in particular to an electric sand discharging air blower. BACKGROUND

[0002] Turboshaft engine is widely used in helicopters, and is a component of turboshaft engine. The sand discharging fan is an important part of the separation device. When the helicopter flies in the desert environment or takes off and lands on the ground with more loose sand, a large amount of sand will be blown up by the rotor airflow. The sand dust separation device can separate the sand dust in the engine intake through the suction of the sand discharging fan, so as to avoid the sand dust from entering the turboshaft engine and causing damage to the performance and strength of the core components of the engine. Therefore, the sand discharging fan plays an important role in ensuring the reliable operation of the turboshaft engine in the sand dust environment.

[0003] At present, the sand discharging fan of the turboshaft engine sand dust separation device is driven by accessory drive components to suck the sand-containing airflow of the sand dust separation device. The accessory drive is coupled with the rotor of the core engine to realize power extraction, that is, the sand discharging fan rotates with the rotor of the core engine. In the sand-free flight environment, the suction of the sand discharging fan is not needed, but it is still running, causing waste of engine energy. Moreover, this transmission method increases the structural complexity and system weight of the accessory drive components. In different sand dust concentration environments, the suction capacity of the sand discharging fan is not controlled, resulting in poor purification effect of the sand dust separation device on the engine intake. Therefore, an independent motor driven fan impeller can be considered to realize electric sand discharging. As a component of the aviation turboshaft engine, the installation space of the electric sand discharging fan is small, the working conditions are harsh, and the overall weight requirement is strict. Since it needs to be in direct contact with the sand-containing airflow, the motor needs to work in a sealed space, which puts extremely strict constraints on the power density and heat dissipation of the motor.

[0004] Therefore, in order to solve the above problems, we need a compact integrated structure, low system weight, high space utilization, simple realization, high reliability, and no additional cooling equipment to realize the cooling of the permanent magnet motor in a sealed space. SUMMARY

[0005] In view of the above problems, the present application discloses an electric sand discharging air blower, which comprises an air inlet structure with open ends, an integrated rear engine case and a permanent magnet motor.

[0006] The rear cartridge comprises a fixed shell with two open ends, and a ring body, one end of the fixed shell is connected with an air inlet structure, the ring body and a permanent magnet motor are sequentially arranged in the fixed shell along the air inlet structure, a plurality of flow guide branches are circumferentially arranged on the ring body and close to the inner wall of the fixed shell, and a reverse curvature outlet flow channel is formed between adjacent flow guide branches and the inner wall of the fixed shell, the air inlet structure is connected with the permanent magnet motor, the connection end of the air inlet structure and the permanent magnet motor is located in the ring body, and the air inlet structure is communicated with the outlet flow channel.

[0007] Further, the ring body is sequentially provided with a containing cavity and a heat conducting ring cavity outwardly diffusing based on the transverse center line of the ring body, a plurality of heat conducting branches are circumferentially arranged in the heat conducting ring cavity, one end of the air inlet structure and the permanent magnet motor respectively extends into the containing cavity, one end of the ring body close to the air inlet structure is provided with a clamping hole communicated with the containing cavity, the part of the ring body close to the clamping hole is provided with a convex ring, the convex ring is clamped in the air inlet structure, the other end of the ring body is provided with a fixed hole communicated with the containing cavity, the permanent magnet motor is clamped in the fixed hole, and the air inlet structure is clamped in the clamping hole.

[0008] The inner diameter of the convex ring is greater than the inner diameter of the clamping hole.

[0009] The inner diameter of the convex ring is less than the inner diameter of the containing cavity.

[0010] The inner diameter of the fixed hole is greater than the inner diameter of the containing cavity.

[0011] Further, the air inlet structure comprises a containing shell with two open ends and connected with the fixed shell, and an impeller assembly.

[0012] The impeller assembly comprises a rotating shaft, a large head screw, an inclined flow impeller, a first bearing seat, a first bearing, a first sealing ring, a second sealing ring and a locking nut.

[0013] The rotating shaft is a hollow structure, a large head screw is screwed into one end of the rotating shaft, the other end of the rotating shaft is a spline end, one end of the spline end extending into the containing cavity is connected with the permanent magnet motor, the inclined flow impeller, the first sealing ring, the first bearing and the second sealing ring are sequentially arranged on the rotating shaft in a interference fit mode of shaft hole, the inclined flow impeller is close to the large head screw, the locking nut is threadedly connected with the rotating shaft, the first bearing seat in interference fit mode of shaft hole is arranged on the first sealing ring and the first bearing, and the first bearing seat is connected with the ring body through a key bolt.

[0014] The convex ring is clamped in the first bearing seat.

[0015] The second sealing ring is clamped in the clamping hole.

[0016] Further, the first bearing seat comprises a seat body and a fixing ring, the seat body is provided with the fixing ring at one end thereof towards the annular body, a convex ring is clamped in the inner hole of the fixing ring, a first sealing ring and a first bearing are sequentially arranged in the seat body in interference fit with a shaft hole, and a key bolt is arranged on the seat body;

[0017] One end of the first sealing ring in contact with the mixed flow impeller is provided with an anti-skid ring with a diameter larger than that of the first sealing ring, and the side of the anti-skid ring away from the mixed flow impeller is close to the end face of the first bearing seat.

[0018] Further, the mixed flow impeller comprises a mounting ring and an extension shell, the mounting ring is provided with the extension shell, the seat body is accommodated in the extension shell, a plurality of blades are circumferentially arranged on the extension shell, and adjacent blades form an air inlet mixed flow channel in communication with an outlet flow channel with the inner wall of the accommodating shell.

[0019] Further, the permanent magnet motor comprises a stator assembly and a rotor assembly, the accommodating cavity is in contact with the stator assembly, one end of the annular body away from the impeller assembly is connected with the rotor assembly, and the end of the rotor assembly extending into the stator assembly is connected with the spline end.

[0020] The stator assembly comprises a stator core and an armature winding, and the armature winding is wound in the stator core.

[0021] Further, the rotor assembly comprises a permanent magnet, a motor shaft, a second bearing, a second bearing seat, a spacer ring, a rotary transformer rotor, a rotary transformer stator, a baffle, a snap ring and a long screw.

[0022] The motor shaft is a hollow structure, one end of the motor shaft extending into the inner ring of the stator core is provided with a spline groove connected with the spline end, the permanent magnet, the second bearing, the spacer ring and the rotary transformer rotor are sequentially arranged on the motor shaft in interference fit with a shaft hole, the permanent magnet is arranged in the stator core, one end of the motor shaft away from the spline groove is provided with a clamping groove, the clamping groove is provided with the snap ring in contact with the rotary transformer rotor, the outer ring of the second bearing is provided with the second bearing seat in interference fit with a shaft hole, the spacer ring and the rotary transformer rotor are accommodated in the second bearing seat, the second bearing seat away from the permanent magnet is provided with the rotary transformer stator accommodating the rotary transformer rotor, the second bearing seat is fixedly provided with the baffle in contact with the outer ring of the second bearing through the long screw, and the motor shaft passes through the baffle.

[0023] Further, one end of the motor shaft close to the spline groove is provided with a blocking ring in contact with the permanent magnet.

[0024] Further, the second bearing seat comprises a mounting shell with two open ends and an extension ring, one end of the mounting shell close to the permanent magnet is provided with the extension ring, the part of the mounting shell close to the second bearing is provided with the long screw, the mounting shell is connected with the annular body, the extension ring is provided with the baffle accommodated in the inner hole, and the extension ring is clamped in the fixing hole.

[0025] The mounting shell is provided with an end cover at one end away from the extension ring.

[0026] Further, the fixing shell is provided with a cable conduit extending into the second bearing seat.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1) The integrated structure of the present application is compact, simple to realize, high in reliability and high in space utilization, and cooling of the permanent magnet motor in a closed space can be realized without additional cooling equipment.

[0029] 2) In the present application, the heat generated by the stator assembly is successively transferred to the heat-conducting branch plate and the surface of the annular body through the accommodation cavity, and then taken away by the cold gas in the flow channel, so that no additional cooling device is needed, the system weight is reduced, and the system efficiency and reliability are improved.

[0030] 3) The present application uses a high-power-density permanent magnet motor to drive the impeller to work, and the output speed and torque are controllable, which can adapt to different environmental requirements for adjustment, improve the purification effect of the sand and dust separation device on engine intake, and avoid waste of engine energy.

[0031] 4) The present application uses an oblique flow impeller and a reverse curvature outlet flow channel, the wind pressure coefficient is relatively high compared with an axial flow fan, the flow coefficient is relatively high compared with a centrifugal fan, the heat exchange efficiency is improved, and the structure is compact and high in space utilization, which is conducive to integration with the permanent magnet motor.

[0032] 5) In the present application, the mounting shell and the annular body are designed in an integrated manner, and the end cover and the second bearing seat are designed in an integrated manner, which reduces the number of parts and reduces the system weight.

[0033] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structures indicated in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0035] Figure 1 A structural schematic diagram according to the first embodiment of the present application is shown;

[0036] Figure 2 a perspective view of Figure 1 ;

[0037] Figure 3 a structural schematic view of an impeller assembly according to an embodiment of the present application is shown;

[0038] Figure 4 a perspective view of Figure 3 ;

[0039] Figure 5 a structural schematic view of a stator assembly according to an embodiment of the present application is shown;

[0040] Figure 6 a structural schematic view of a rotor assembly according to an embodiment of the present application is shown;

[0041] Figure 7 a perspective view of Figure 6 ;

[0042] Figure 8 a connection schematic view of a mounting shell and an end cover according to an embodiment of the present application is shown;

[0043] Figure 9 a structural schematic view of a rear machine case according to an embodiment of the present application is shown;

[0044] Figure 10 a perspective view of Figure 9 ;

[0045] BRIEF DESCRIPTION OF DRAWINGS: 1 housing shell, 2 impeller assembly, 21 thumb screw, 22 mixed flow impeller, 221 mounting ring, 222 extension shell, 223 blade, 23 first sealing ring, 231 anti-skid ring, 24 air inlet mixed flow channel, 25 first bearing seat, 251 key bolt, 252 seat body, 253 fixing ring, 26 first bearing, 27 second sealing ring, 28 locking nut, 29 rotating shaft, 291 spline end, 3 rear machine case, 31 fixed shell, 32 annular body, 321 accommodating cavity, 322 heat-conducting ring cavity, 323 heat-conducting branch plate, 324 clamping hole, 325 protruding ring, 326 fixing hole, 33 flow guide branch plate, 34 outlet flow channel, 4 permanent magnet motor, 41 stator assembly, 411 stator core, 412 armature winding, 42 rotor assembly, 421 permanent magnet, 422 motor shaft, 4221 spline groove, 4222 blocking ring, 4223 clamping groove, 423 second bearing seat, 4231 extension ring, 4232 mounting shell, 4233 through hole, 4234 long screw, 424 baffle, 425 second bearing, 426 spacing ring, 427 rotary transformer rotor, 428 rotary transformer stator, 429 clamping ring, 5 end cover, 6 cable conduit. DETAILED DESCRIPTION

[0046] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] Figure 1 A structural schematic diagram according to Embodiment One of the present application is shown. As shown in Figure 1 , an electric sand drainage blower includes an air inlet structure with both ends open, an integrated rear machine case 3, and a permanent magnet motor 4.

[0048] The rear machine case 3 includes a fixed shell 31 with both ends open and an annular body 32. The fixed shell 31 is connected with the air inlet structure at one end. The annular body 32 and the permanent magnet motor 4 are sequentially arranged in the fixed shell 31 along the air inlet structure. A plurality of flow guide branch plates 33 are circumferentially arranged on the annular body 32 and close to the inner wall of the fixed shell 31. The adjacent flow guide branch plates 33 and the inner wall of the fixed shell 31 form a plurality of inverted curvature outlet flow channels 34. The air inlet structure is connected with the permanent magnet motor 4. The connection end of the air inlet structure and the permanent magnet motor 4 is located in the annular body 32. The air inlet structure is communicated with the outlet flow channels 34.

[0049] The electric sand drainage blower of the present application realizes the cooling of the permanent magnet motor 4 in a closed space through the air inlet structure with both ends open and the outlet flow channels 34. No additional cooling device is needed, the system weight is reduced, and the system efficiency and reliability are improved. Moreover, the arrangement of the air inlet inclined flow channel 24 and the outlet flow channels 34 makes the integrated structure compact and the space utilization high.

[0050] Figure 2 A perspective view of Figure 1 is shown. As shown in Figure 2 , in some embodiments, seventeen flow guide branch plates 33 close to the inner wall of the fixed shell 31 are circumferentially arranged on the annular body 32. Then, seventeen inverted curvature outlet flow channels 34 are formed between the adjacent flow guide branch plates 33 and the inner wall of the fixed shell 31. The gas convection is accelerated, and the heat exchange efficiency is improved.

[0051] Figure 10 A perspective view of Figure 9 is shown. As shown in Figure 10 , in some embodiments, thirteen heat conduction branch plates 323 are circumferentially arranged in the heat conduction ring cavity 322. The heat conduction branch plates 323 can quickly conduct the heat generated by the permanent magnet 421 to the flow guide branch plates 33 through the accommodation cavity 321, and then conduct the heat to the outlet flow channels 34, which is dissipated through the gas convection heat exchange with the outlet flow channels 34.

[0052] In some embodiments, the air inlet structure is connected to the fixed shell 31 by screws, so that the integrated structure is compact.

[0053] Figure 9 A structural diagram of the rear casing 3 according to Embodiment One of the present application is shown. As shown in Figure 9 In some embodiments, the annular body 32 is provided with a receiving cavity 321 and a heat-conducting ring cavity 322 in sequence and outwardly from the lateral center line thereof, a plurality of heat-conducting branch plates 323 are circumferentially provided in the heat-conducting ring cavity 322, one end of the air inlet structure and the permanent magnet motor 4 respectively extends into the receiving cavity 321, one end of the annular body 32 close to the air inlet structure is provided with a clamping hole 324 in communication with the receiving cavity 321, the part of the annular body 32 close to the clamping hole 324 is provided with a convex ring 325 clamped in the air inlet structure, the other end of the annular body 32 is provided with a fixing hole 326 in communication with the receiving cavity 321, the permanent magnet motor 4 is clamped in the fixing hole 326, and the air inlet structure is clamped in the clamping hole 324; the inner diameter of the convex ring 325 is greater than the inner diameter of the clamping hole 324; the inner diameter of the convex ring 325 is less than the inner diameter of the receiving cavity 321; and the inner diameter of the fixing hole 326 is greater than the inner diameter of the receiving cavity 321. The convex ring 325 and the clamping hole 324 limit different parts of the air inlet structure, and the fixing hole 326 limits the rotor assembly 42; the receiving cavity 321 is equivalent to the casing of the permanent magnet motor 4, which not only protects the permanent magnet motor 4, but also transmits heat for the permanent magnet motor 4; and the heat-conducting branch plates 323 transmit heat.

[0054] Figure 3 A structural diagram of the impeller assembly 2 according to Embodiment One of the present application is shown. As shown in Figure 3 In some embodiments, the air inlet structure includes a receiving shell 1 with two open ends and connected to the fixed shell 31, and the impeller assembly 2.

[0055] The impeller assembly 2 includes a rotating shaft 29, a large-head screw 21, an inclined-flow impeller 22, a first bearing seat 25, a first bearing 26, a first sealing ring 23, a second sealing ring 27, and a locking nut 28.

[0056] The rotating shaft 29 is a hollow structure, one end of the rotating shaft 29 is screwed into a large head screw 21, the other end of the rotating shaft 29 is a spline end 291, the spline end 291 extends into one end of the accommodating cavity 321 and is connected with the permanent magnet motor 4, the rotating shaft 29 is sequentially provided with an impeller 22, a first sealing ring 23, a first bearing 26, a second sealing ring 27 in the shaft hole interference fit, the impeller 22 is close to the large head screw 21, the locking nut 28 is threadedly connected with the rotating shaft 29, the first sealing ring 23 and the first bearing 26 are provided with a first bearing seat 25 in the shaft hole interference fit, the first bearing seat 25 is connected with the annular body 32 through the key bolt 251, the convex ring 325 is clamped in the first bearing seat 25, and the second sealing ring 27 is clamped in the clamping hole 324. The rotating shaft 29 is in the shaft hole interference fit with the impeller 22, the first sealing ring 23, the first bearing 26 and the second sealing ring 27, and transmits torque by cooperating with the rotor assembly 42 through the spline end 291, the rotating shaft 29 and the locking nut 28 are in threaded cooperation, which can axially fix the rotating parts of the impeller assembly 2, the convex ring 325 is used for limiting the first bearing seat 25, the first bearing seat 25 is connected with the annular body 32 through the key bolt 251, which can improve the stability of the integrated structure, make the structure compact, and improve the space utilization.

[0057] Specifically, the accommodating shell 1 can be but is not limited to a conical accommodating shell 1.

[0058] In some embodiments, the first bearing seat 25 comprises a seat body 252 and a fixed ring 253, one end of the seat body 252 towards the annular body 32 is provided with the fixed ring 253, the inner hole of the fixed ring 253 is clamped with the convex ring 325, the seat body 252 is sequentially provided with the first sealing ring 23 and the first bearing 26 in the shaft hole interference fit, and the seat body 252 is provided with the key bolt 251; one end of the first sealing ring 23 in contact with the impeller 22 is provided with an anti-skid ring 231 with a diameter larger than that of the first sealing ring 23, and the side of the anti-skid ring 231 away from the impeller 22 is close to the end face of the first bearing seat 25. The convex ring 325 is used for limiting the fixed ring 253, the seat body 252 is connected with the annular body 32 through the key bolt 251, so that the structure is compact, and the anti-skid ring 231 plays a role in limiting the seat body 252.

[0059] In some embodiments, the first sealing ring 23 and the second sealing ring 27 are respectively in the form of a comb, and play a role in sealing the oil and gas in the chambers on both sides of the first bearing 26.

[0060] Specifically, the first sealing ring 23 can be but is not limited to a W-shaped comb.

[0061] Specifically, the second sealing ring 27 can be but is not limited to a W-shaped comb.

[0062] In some embodiments, the oblique flow impeller 22 includes a mounting ring 221 and an extension shell 222. The mounting ring 221 is provided with the extension shell 222, and the seat 252 is accommodated within the extension shell 222. The extension shell 222 is circumferentially provided with a plurality of blades 223. Adjacent blades 223 form an inlet oblique flow channel 24 with the inner wall of the accommodating shell 1, which communicates with the outlet flow channel 34. The mounting ring 221 is interference-fitted with the shaft hole of the rotating shaft 29. The extension shell 222 is used to set the plurality of blades 223. The inlet oblique flow channel 24 between adjacent blades 223 is an oblique flow inlet oblique flow channel 24, which improves the wind pressure coefficient.

[0063] Specifically, the extended shell 222 may be, but is not limited to, a conical extended shell 222, which can improve the wind pressure coefficient.

[0064] Specifically, blade 223 is a thickened blade 223, which can ensure that blade 223 is not easily worn or damaged by sand particles in the airflow.

[0065] Figure 4 It shows Figure 3 A three-dimensional image. For example... Figure 4 As shown, in some embodiments, the extended shell 222 is provided with eight blades 223 of equal thickness in the axial direction. Then, the adjacent blades 223 form eight oblique flow inlet channels 24 with the inner wall of the accommodating shell 1. The eight oblique flow inlet channels 24 are connected to seventeen outlet channels 34. This not only improves the wind pressure coefficient and flow coefficient, but also provides a basis for heat exchange in the outlet channels 34.

[0066] Figure 5 A schematic diagram of the stator assembly 41 according to Embodiment 1 of the present invention is shown. Figure 5 As shown, in some embodiments, the permanent magnet motor 4 includes a stator assembly 41 and a rotor assembly 42. The stator assembly 41 is disposed in contact with the cavity 321. The rotor assembly 42 is connected to the end of the annular body 32 away from the impeller assembly 2. The end of the rotor assembly 42 extending into the stator assembly 41 is connected to the spline end 291. The stator assembly 41 includes a stator core 411 and an armature winding 412. The armature winding 412 is wound inside the stator core 411. The rotor assembly 42 transmits torque through its connection with the spline end 291, causing the impeller assembly 2 to rotate and carrying away the heat generated by the stator assembly 41, thereby achieving heat dissipation. After three-phase symmetrical alternating current is applied to the armature winding 412, a rotating magnetomotive force is formed in the air gap of the permanent magnet motor 4, which applies a certain torque to the rotor assembly 42, driving the motor shaft 422 to rotate.

[0067] Specifically, stator assembly 41 is a concentrated winding form with a six-slot, four-pole structure.

[0068] Figure 6A schematic diagram of the rotor assembly 42 according to Embodiment 1 of the present invention is shown. As shown, in some embodiments, the rotor assembly 42 includes a permanent magnet 421, a motor shaft 422, a second bearing 425, a second bearing housing 423, a spacer ring 426, a resolver rotor 427, a resolver stator 428, a baffle 424, a retaining ring 429, and a long screw 4234;

[0069] The motor shaft 422 is a hollow structure. One end of the motor shaft 422 extending into the inner ring of the stator core 411 has a spline groove 4221 for connecting to the spline end 291. The motor shaft 422 is sequentially provided with a permanent magnet 421 with an interference fit to its shaft hole, a second bearing 425, a spacer ring 426, and a resolver rotor 427. The permanent magnet 421 is disposed within the stator core 411. The end of the motor shaft 422 away from the spline groove 4221 has a retaining groove 4223, within which a resolver rotor is disposed. The retaining ring 429 contacts the second bearing 425. The outer ring of the second bearing 425 is provided with a second bearing seat 423 with an interference fit to the shaft hole. The spacer ring 426 and the resolver rotor 427 are housed in the second bearing seat 423. The end of the second bearing seat 423 away from the permanent magnet 421 is provided with a resolver stator 428 for housing the resolver rotor 427. A baffle 424 that contacts the outer ring of the second bearing 425 is fixed in the second bearing seat 423 by a long screw 4234. A motor shaft 422 passes through the baffle 424. The permanent magnet 421 is located inside the stator core 411, which allows the armature winding 412 to be supplied with three-phase symmetrical alternating current and be subjected to a certain torque to drive the motor shaft 422 to rotate. The spline end 291 is connected to the spline groove 4221 to transmit the torque of the motor shaft 422 to the rotating shaft 29, thereby driving the eccentric impeller 22 to rotate. The retaining ring 429 serves to axially install the rotating parts of the rotor assembly 42. The resolver rotor 427 and the resolver stator 428 form a resolver transformer, which is used to measure the rotor speed of the permanent magnet motor 4.

[0070] Specifically, the lead signal lines of the resolver transformer need to be wrapped with a shielding layer to prevent the three-phase high-voltage lines of the permanent magnet motor 4 from interfering with the low-voltage signal.

[0071] Specifically, the rotating shaft 29 and the motor shaft 422 adopt a hollow structure and are connected and transmit torque through the spline end 291 and the spline groove 4221, which facilitates disassembly and assembly and reduces the weight of the system.

[0072] Figure 7 It shows Figure 6 A three-dimensional image. For example... Figure 7 As shown, in some embodiments, a blocking ring 4222 is provided at one end of the motor shaft 422 near the spline groove 4221, and the blocking ring 4222 is in contact with the permanent magnet 421.

[0073] Figure 8A schematic diagram showing the connection between the mounting housing 4232 and the end cap 5 according to Embodiment 1 of the present invention is shown. Figure 8 As shown, in some embodiments, the second bearing housing 423 includes a mounting shell 4232 with openings at both ends and an extension ring 4231. The mounting shell 4232 has an extension ring 4231 at one end near the permanent magnet 421. The mounting shell 4232 has a long screw 4234 at the part near the second bearing 425. The mounting shell 4232 is connected to the annular body 32. A baffle 424 is accommodated in the inner hole of the extension ring 4231. The extension ring 4231 is engaged in the fixing hole 326. The end of the mounting shell 4232 away from the extension ring 4231 has an end cap 5 for accommodating the resolver stator 428. The second bearing housing 423 is confined within the fixing hole 326 by the extension ring 4231 and fixed to the annular body 32 by multiple screws, making the integrated structure compact; the baffle 424 is used to limit the position of the second bearing 425; both the receiving shell 1 and the fixing shell 31 are open at both ends, so airflow is unobstructed; the end cover 5 is fixed to the mounting shell 4232 by screws, which prevents foreign objects from entering the permanent magnet motor 4.

[0074] In some embodiments, the permanent magnet 421 is in the form of a Halbach array to improve the reliability of the rotor assembly 42 and the power density of the permanent magnet motor 4.

[0075] In some embodiments, the mounting housing 4232 is connected to the annular body 32 by screws, which makes the integrated structure compact.

[0076] In some embodiments, the fixed housing 31 is provided with a cable conduit 6 extending into the second bearing seat 423. The cable conduit 6 passes through the outlet channel 34 and extends into the second bearing seat 423, which can protect the cable of the permanent magnet motor 4.

[0077] In some embodiments, the mounting housing 4232 is provided with a through hole 4233, and a cable conduit 6 is inserted through the through hole 4233; the through hole 4233 provides conditions for the cable conduit 6 to enter the second bearing seat 423.

[0078] Specifically, sealant is applied to the interface between the through hole 4233 and the cable conduit 6 to achieve a seal, preventing sand and dust in the outlet flow channel 34 from entering the interior of the permanent magnet motor 4.

[0079] The working principle of the electric sand-removing blower is as follows:

[0080] In use, the armature winding 412 is connected to three-phase symmetrical alternating current, forming a rotating magnetic motive force in the air gap of the permanent magnet motor 4. Since the permanent magnet 421 is arranged in the inner circle of the stator core 411, a certain torque is exerted on the permanent magnet 421, driving the motor shaft 422 to rotate. The rotating shaft 29 is connected to the spline groove 4221 through the spline end 291, so the torque of the motor shaft 422 is transmitted to the rotating shaft 29, thereby driving the inclined impeller 22 to rotate, sucking the sand-containing air flow. The air flow enters the outlet flow channel 34 through the inlet inclined flow channel 24 and is discharged to the atmosphere. At the same time, when the permanent magnet motor 4 is running, the heat generated by the stator assembly 41 is successively transmitted to the heat-conducting branch plate 323, the inner wall of the heat-conducting ring cavity 322, the surface of the annular body 32, and finally carried away by the cold air in the outlet flow channel 34. Due to the cooperation of the inclined impeller 22 and the reverse curvature outlet flow channel 34, the wind pressure coefficient and the flow coefficient are high, so rapid heat dissipation can be achieved. Therefore, without additional cooling equipment, the cooling of the permanent magnet motor 4 in a closed space can be realized, and the system efficiency and reliability are improved. The integration of the rear machine case 3 and the integration of the end cover 5 and the second bearing seat 423 not only reduce the system weight and the number of parts, but also have a compact structure and high space utilization.

[0081] Specifically, the inner wall of the accommodating cavity 321 can be coated with a layer of high-thermal-conductivity silicone or high-thermal-conductivity phase-change material to improve the heat conduction performance.

[0082] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent replacements can be made to part of the technical features; and such modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrically powered sand draining blower, characterized in that, Including two ends open air inlet structure, integrated rear machine case (3), permanent magnet motor (4); The rear machine case (3) includes a fixed shell (31) with two open ends and a ring body (32), one end of the fixed shell (31) is connected with an air inlet structure, the ring body (32) and the permanent magnet motor (4) are sequentially arranged in the fixed shell (31) along the air inlet structure, a plurality of guide branch plates (33) are arranged on the ring body (32) in a circumferential direction and close to the inner wall of the fixed shell (31), adjacent guide branch plates (33) and the inner wall of the fixed shell (31) form a plurality of inverted curvature outlet flow channels (34), the air inlet structure is connected with the permanent magnet motor (4), the connection end of the air inlet structure and the permanent magnet motor (4) is located in the ring body (32), and the air inlet structure is communicated with the outlet flow channel (34); the ring body (32) is sequentially provided with a containing cavity (321) and a heat conduction ring cavity (322) which are diffused outward with the horizontal center line of the ring body (32) as a reference, a plurality of heat conduction branch plates (323) are arranged in the heat conduction ring cavity (322) in a circumferential direction, one end of the air inlet structure and the permanent magnet motor (4) which respectively extend into the containing cavity (321) is connected, one end of the ring body (32) close to the air inlet structure is provided with a clamping hole (324) which is communicated with the containing cavity (321), the ring body (32) close to the clamping hole (324) is provided with a convex ring (325), the convex ring (325) is clamped in the air inlet structure, the other end of the ring body (32) is provided with a fixing hole (326) which is communicated with the containing cavity (321), the permanent magnet motor (4) is clamped in the fixing hole (326), and the air inlet structure is clamped in the clamping hole (324); thirteen heat conduction branch plates (323) are arranged in the heat conduction ring cavity (322) in a circumferential direction; The air inlet structure includes a containing shell (1) which is open at both ends and is connected with the fixed shell (31), and an impeller assembly (2), the impeller assembly (2) includes an inclined flow impeller (22), the inclined flow impeller (22) includes a mounting ring (221) and an extension shell (222), the extension shell (222) is arranged on the mounting ring (221), eight blades (223) with equal thickness are arranged on the extension shell (222) in an axial direction, adjacent blades (223) and the inner wall of the containing shell (1) form eight inclined flow air inlet inclined flow channels (24); Seventeen guide branch plates (33) close to the inner wall of the fixed shell (31) are arranged on the ring body (32) in a circumferential direction, adjacent guide branch plates (33) and the inner wall of the fixed shell (31) form seventeen inverted curvature outlet flow channels (34).

2. The electric sand blowing fan according to claim 1, wherein The inner diameter of the convex ring (325) is greater than the inner diameter of the clamping hole (324); The inner diameter of the convex ring (325) is less than the inner diameter of the containing cavity (321); The inner diameter of the fixing hole (326) is greater than the inner diameter of the containing cavity (321).

3. The electric sand blowing fan according to claim 1, wherein The impeller assembly (2) further comprises a rotating shaft (29), a large-head screw (21), a first bearing seat (25), a first bearing (26), a first sealing ring (23), a second sealing ring (27) and a locking nut (28). The rotating shaft (29) is of a hollow structure, one end of the rotating shaft (29) is screwed into the large-head screw (21), the other end of the rotating shaft (29) is a spline end (291), the spline end (291) is connected with the permanent magnet motor (4) by extending into one end of the accommodating cavity (321), the oblique flow impeller (22), the first sealing ring (23), the first bearing (26) and the second sealing ring (27) are arranged on the rotating shaft (29) in sequence in an interference fit with the shaft hole, the oblique flow impeller (22) is close to the large-head screw (21), the locking nut (28) is threadedly connected with the rotating shaft (29), the first bearing seat (25) is arranged on the first sealing ring (23) and the first bearing (26) in an interference fit with the shaft hole, and the first bearing seat (25) is connected with the annular body (32) through the keyed stud (251). The convex ring (325) is clamped in the first bearing seat (25). The second sealing ring (27) is clamped in the clamping hole (324).

4. An electrically powered sand-augering blower as claimed in claim 3, characterized in that The first bearing seat (25) comprises a seat body (252) and a fixing ring (253), one end of the seat body (252) towards the annular body (32) is provided with the fixing ring (253), the inner hole of the fixing ring (253) is clamped with the convex ring (325), and the first sealing ring (23) and the first bearing (26) are sequentially arranged in the seat body (252) in an interference fit with the shaft hole. One end of the first sealing ring (23) in contact with the oblique flow impeller (22) is provided with an anti-skid ring (231) with a larger diameter than the first sealing ring (23), and the side of the anti-skid ring (231) away from the oblique flow impeller (22) is close to the end face of the first bearing seat (25).

5. An electrically powered sand draining blower as claimed in claim 4, characterized in that The seat body (252) is accommodated in the extended shell (222).

6. An electrically powered sand-augering blower according to any one of claims 3 to 5, characterised in that, The permanent magnet motor (4) comprises a stator assembly (41) and a rotor assembly (42), the stator assembly (41) is arranged in contact in the accommodating cavity (321), one end of the annular body (32) away from the impeller assembly (2) is connected with the rotor assembly (42), and the rotor assembly (42) extends into the stator assembly (41) and is connected with the spline end (291); The stator assembly (41) comprises a stator core (411) and an armature winding (412), and the armature winding (412) is arranged in the stator core (411).

7. An electrically powered sand-augering blower as claimed in claim 6, characterized in that The rotor assembly (42) comprises a permanent magnet (421), a motor shaft (422), a second bearing (425), a second bearing seat (423), a spacer ring (426), a resolver rotor (427), a resolver stator (428), a baffle (424), a clamping ring (429) and a long screw (4234). The motor shaft (422) is a hollow structure, one end of the motor shaft (422) extending into the inner ring of the stator core (411) is provided with a spline groove (4221) connected with the spline end (291), the motor shaft (422) is sequentially provided with a permanent magnet (421) in interference fit with the shaft hole, a second bearing (425), a spacer ring (426), and a rotary variable resistor rotor (427), the permanent magnet (421) is arranged in the stator core (411), one end of the motor shaft (422) away from the spline groove (4221) is provided with a clamping groove (4223), the clamping groove (4223) is provided with a clamping ring (429) in contact with the rotary variable resistor rotor (427), the outer ring of the second bearing (425) is provided with a second bearing seat (423) in interference fit with the shaft hole, the spacer ring (426) and the rotary variable resistor rotor (427) are accommodated in the second bearing seat (423), one end of the second bearing seat (423) away from the permanent magnet (421) is provided with a rotary variable resistor stator (428) accommodating the rotary variable resistor rotor (427), the second bearing seat (423) is fixedly provided with a baffle (424) in contact with the outer ring of the second bearing (425) through a long screw (4234), and the motor shaft (422) is arranged in the baffle (424).

8. An electrically powered sand-augering blower according to claim 7, characterized in that One end of the motor shaft (422) close to the spline groove (4221) is provided with a blocking ring (4222), and the blocking ring (4222) is in contact with the permanent magnet (421).

9. An electrically powered sand-augering blower as claimed in claim 7, characterized in that The second bearing seat (423) comprises an installation shell (4232) with two open ends and an extension ring (4231), one end of the installation shell (4232) close to the permanent magnet (421) is provided with the extension ring (4231), the installation shell (4232) is provided with the long screw (4234) at a position close to the second bearing (425), the installation shell (4232) is connected with the annular body (32), the inner hole of the extension ring (4231) accommodates the baffle (424), and the extension ring (4231) is clamped in the fixing hole (326). One end of the installation shell (4232) away from the extension ring (4231) is provided with an end cover (5) accommodating the rotary variable resistor stator (428).

10. An electrically powered sand-augering blower as claimed in claim 9, characterized in that The fixed shell (31) is provided with a cable pipeline (6) extending into the second bearing seat (423).

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