Ducted motor

Abstract

The invention relates to a ducted motor which comprises a motor shell, a stator, a rotor assembly and end covers, the stator is fixedly installed in the motor shell, the rotor assembly is installed in the stator, the motor shell is a pipe fitting with two open ends, the end covers comprise a front end cover and a rear end cover, and the front end cover and the rear end cover are arranged at the two ends of the motor shell in a covering mode respectively. The two ends of the rotor assembly are erected on the front end cover and the rear end cover respectively. According to the ducted motor, the motor shell is prevented from being manufactured by a mold, the manufacturing cost of the motor shell is effectively reduced, and the cost advantage can be fully played in manufacturing of products of multiple specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a ducted motor. Background Art

[0002] A ducted motor is an electric motor that accelerates, pressurizes or decelerates gas (such as air) or liquid (such as water) through guide vanes and impellers with specific shapes. The working principle of a ducted motor is to accelerate the fluid through the duct and then send it into the impeller. The impeller is impacted by the fluid, generating a reaction force that drives the entire ducted motor to rotate. Ducted motors have the advantages of high efficiency, low noise, and low vibration. They are often used in a variety of small devices, such as garden tools, power tools, drones, fans, air conditioners, and car models.

[0003] The existing ducted motor consists of a duct shell, an end cover and a motor body. During the operation of the ducted motor, if the inlet velocity of the fluid, the shape and length of the duct are the same, then the distance between the inner and outer cylinders of the duct shell will have a certain impact on the flow of the fluid. This distance may affect the width of the fluid channel, and then affect the flow rate and flow velocity of the fluid. Therefore, in order to maximize the work efficiency, the fluid channel width must be optimized.

[0004] Due to space limitations, ducted motors used in small devices are usually designed with a smaller duct housing diameter. Therefore, when the motor is required to provide different power outputs, the diameter of the motor body placed in the duct housing cannot be changed significantly, and the power can generally only be adjusted by adjusting the motor length. In this case, various motor models with the same diameter but different lengths are produced. According to the traditional motor structure, the motor stator and rotor can be manufactured in different lengths as needed, but the motor housing generally needs to be matched by opening a special mold, which results in a large number of molds and high costs. Summary of the invention

[0005] In view of the defects of the prior art, the technical problem to be solved by the present invention is to provide a ducted motor, which avoids the use of molds to manufacture the motor housing, effectively reduces the manufacturing cost of the motor housing, and can give full play to the cost advantage in the manufacture of products of multiple specifications.

[0006] In order to solve the above technical problems, the present invention proposes a ducted motor, which adopts the following technical solutions:

[0007] A ducted motor includes a motor housing, a stator, a rotor assembly and an end cover. The stator is fixedly installed in the motor housing, and the rotor assembly is installed in the stator. The motor housing is a pipe with openings at both ends. The end cover includes a front cover and a rear cover. The front cover and the rear cover are respectively covered at the two ends of the motor housing, and the two ends of the rotor assembly are respectively mounted on the front cover and the rear cover.

[0008] The common structure of ordinary motors is that one end is closed and the other end is open, and an end cover is provided at the opening. The advantage of this is that there is only one end cover, the cost is low, and the rotor assembly is easy to install. However, as mentioned in the background technology, due to the characteristics of ducted motors, the shell diameter has a limited range of variation, while the length specifications are diverse. Therefore, if a general motor structure is used, the cost will increase significantly when the specifications are diverse. Based on this characteristic, the present invention selects pipe fittings as the motor housing. Such pipe fittings are obtained by arbitrarily cutting long pipes, and then end covers are provided at both ends to avoid using molds to manufacture the motor housing. Moreover, the current pipe fitting manufacturing technology is mature and the precision is very high, which can fully guarantee the precision requirements as the motor housing and has good processability.

[0009] Preferably, a convex stop is provided at one end of the end cover, the cylindrical surface of the convex stop is in contact with the inner wall of the motor housing, the end surface of the convex stop is against the end surface of the motor housing, and the outer cylindrical surface size of the end cover is not larger than the outer cylindrical surface size of the motor housing. The design of the convex stop allows a tight fit between the end cover and the motor housing. The double contact surface design effectively reduces the gap between the two, such as the contact between the cylindrical surface of the convex stop and the inner wall of the motor housing, and the contact between the end surface of the convex stop and the end surface of the motor housing, thereby enhancing the sealing of the motor and improving the stability of the motor operation.

[0010] Preferably, the end cover is integrally embedded in the motor housing, and the outer end surface of the end cover is flush with the end of the motor housing. Compared with the traditional connection method in which the end cover is sleeved on the outside of the motor housing, the method in which the end cover is integrally embedded in the motor housing significantly reduces the overall diameter of the motor and makes the motor surface smoother. This design is more convenient for motor installation and can effectively reduce the interference with other components when the motor is running.

[0011] Furthermore, the end face of the motor housing is provided with a groove and the outer cylindrical surface of the end cover is provided with a protrusion that matches the groove, or the end face of the motor housing is provided with a concave stopper and the end cover is embedded in the concave stopper. Whether it is the cooperation between the groove and the protrusion, or the embedded design of the end cover and the concave stopper, a precise assembly positioning mechanism is formed to ensure that the end cover can be accurately aligned with the corresponding position of the motor housing during the assembly process, avoiding looseness or misalignment caused by assembly errors, thereby improving the overall assembly accuracy and stability of the motor.

[0012] Preferably, a duct is provided outside the motor housing, and a first connecting rib is provided between the duct and the motor housing, and the motor housing, the duct and the first connecting rib are an integrated structure. The motor housing, the duct and the first connecting rib are made by an integrated molding process to form a solid overall structure. This design significantly improves the strength and stability of the motor housing and its peripheral structure, allowing the motor to better withstand various external forces and loads, thereby extending the service life of the motor. At the same time, a uniformly structured duct is formed between the first connecting rib, the duct and the motor housing, which is conducive to optimizing the fluid distribution inside the duct, making the fluid pass more evenly and stably, thereby improving the energy conversion efficiency of the motor.

[0013] Preferably, a duct shell is also included, and the duct shell includes an inner cylinder and an outer cylinder. The inner cylinder and the outer cylinder are coaxially arranged, and the outer cylindrical surface of the inner cylinder and the inner cylindrical surface of the outer cylinder are provided with a second connecting rib. The inner cylinder, the outer cylinder and the second connecting rib are an integrated structure, and the motor shell is fixedly installed in the inner cylinder. Different from the aforementioned integrated design of the motor shell and the duct shell, this solution designs the motor shell and the duct shell as two separable independent components. The advantage of this design is that it allows the duct shell and the motor shell to be quickly disassembled and assembled. Specifically, when it is necessary to replace a motor of different power, the user only needs to replace the main body of the motor without replacing the duct shell. In this way, motors of different powers can be flexibly selected according to actual needs, thereby effectively saving resources and costs.

[0014] Furthermore, a mounting surface is provided at one end of the inner tube, and the outer end surface of the front end cover is in contact with the mounting surface, and corresponding mounting holes are provided on the front end cover and the mounting surface. The outer end surface of the front end cover is closely fitted with the mounting surface of the inner tube, ensuring a stable connection between the two. This mounting method reduces vibration and noise caused by looseness or gaps, and improves the stability of the entire structure; on the other hand, it does not affect the shape of the duct, thereby facilitating the passage of fluid.

[0015] Preferably, the rotor assembly includes a motor shaft, a rotor and a bearing. There are two bearings, which are respectively mounted on the front cover and the rear cover. The two ends of the motor shaft are rotatably mounted in the two bearings, and the rotor is fixedly mounted in the middle of the motor shaft. By mounting two bearings on the front cover and the rear cover respectively, the two ends of the motor shaft are stably supported. This design greatly enhances the rotational stability of the motor shaft, reduces the wear caused by vibration and shaking, and thus prolongs the service life of the entire rotor assembly.

[0016] Preferably, a fixing hole is provided at the center of the end cover, and the outer ring of the bearing is fixedly connected to the fixing hole. Through the standardized fixing hole design, on the one hand, the assembly process of the motor can be simplified, the assembly difficulty can be reduced, and the assembly error caused by position deviation can be avoided; on the other hand, the connection between the outer ring of the bearing in the rotor assembly and the fixing hole enhances the overall structural stability of the motor and reduces vibration and noise.

[0017] Preferably, a plurality of heat dissipation holes are provided on the end cover, and the heat dissipation holes are arranged at intervals in the circumferential direction. The design of the heat dissipation holes increases the surface area of ​​heat exchange, so that heat can be more effectively transferred from the inside to the external environment. By arranging the heat dissipation holes at intervals in the circumferential direction, it can be ensured that heat is evenly dissipated in multiple directions, avoiding the accumulation of heat in a certain local area, thereby improving the overall heat dissipation efficiency.

[0018] In summary, this type of ducted motor avoids using molds to manufacture the motor housing, effectively reducing the manufacturing cost of the motor housing and giving full play to the cost advantage in the manufacturing of products with multiple specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the general assembly structure of the present invention Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the general assembly structure of the present invention Figure 2 ;

[0022] Figure 3 It is a structural schematic diagram of a connection method between the end cover and the motor housing of the present invention;

[0023] Figure 4 It is a structural schematic diagram of another connection method between the end cover and the motor housing of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the duct shell of the present invention;

[0025] Among them, motor housing -1, groove -11, stator -2, rotor assembly -3, motor shaft -31, rotor -32, bearing -33, end cover -4, front end cover -41, convex stop -411, protrusion -412, rear end cover -42, fixing hole -43, heat dissipation hole -44, duct tube -5, first connecting rib -51, duct shell -6, inner tube -61, outer tube -62, second connecting rib -63, mounting surface -64, mounting hole -641. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1 A ducted motor is shown, comprising a motor housing 1, a stator 2, a rotor assembly 3 and an end cover 4, wherein the stator 2 is fixedly mounted in the motor housing 1, the rotor assembly 3 is mounted in the stator 2, the motor housing 1 is a pipe fitting with openings at both ends, the end cover 4 comprises a front end cover 41 and a rear end cover 42, the front end cover 41 and the rear end cover 42 are respectively covered at both ends of the motor housing 1, and the two ends of the rotor assembly 3 are respectively mounted on the front end cover 41 and the rear end cover 42.

[0028] The common structure of an ordinary motor is that one end is closed and the other end is open, and an end cover 4 is provided at the opening. The advantage of this is that there is only one end cover 4, the cost is low, and the rotor assembly 3 is easy to install. However, as mentioned in the background technology, due to the characteristics of the ducted motor, the shell diameter has a limited range of variation, while the length specifications are diverse. Therefore, if a general motor structure is used, the cost will increase significantly when the specifications are diverse. Based on this characteristic, the present invention selects pipe fittings as the motor housing 1. Such pipe fittings are obtained by arbitrarily cutting long pipes, and then end covers 4 are provided at both ends to avoid using molds to manufacture the motor housing. Moreover, the current pipe fitting manufacturing technology is mature and the precision is very high, which can fully guarantee the precision requirements as the motor housing and has good processability.

[0029] As a first implementation method of connecting the end cover and the motor housing, Figure 1 As shown, a convex stop 411 is provided at one end of the end cover 4, the cylindrical surface of the convex stop 411 abuts against the inner wall of the motor housing 1, the end surface of the convex stop 411 abuts against the end surface of the motor housing 1, and the outer cylindrical surface size of the end cover 4 is not larger than the outer cylindrical surface size of the motor housing 1. The design of the convex stop 411 enables a tight fit between the end cover 4 and the motor housing 1. The cylindrical surface of the convex stop 411 abuts against the inner wall of the motor housing 1, and the end surface of the convex stop 411 abuts against the end surface of the motor housing 1. This double contact surface design effectively reduces the gap between the two, thereby enhancing the sealing of the motor and improving the stability of the motor operation.

[0030] As a second embodiment of the connection between the end cover and the motor housing, the end cover 4 is integrally embedded in the motor housing 1, and the outer end surface of the end cover 4 is flush with the end of the motor housing 1. Compared with the traditional connection method in which the end cover 4 is sleeved on the outside of the motor housing 1, the method in which the end cover 4 is integrally embedded in the motor housing 1 significantly reduces the overall diameter of the motor and makes the motor surface smoother. This design is more convenient for motor installation and can effectively reduce the interference with other components when the motor is running.

[0031] As a second embodiment of the connection between the end cover and the motor housing, the first method of connecting the end cover and the motor housing is as follows: Figure 3As shown, the end surface of the motor housing 1 is provided with a groove 11 and the outer cylindrical surface of the end cover 4 is provided with a protrusion 412 that matches the groove 11, as a second embodiment of the connection between the end cover and the motor housing, the second way of connecting the end cover and the motor housing is as follows. Figure 4 As shown, the end face of the motor housing 1 is provided with a concave stop 12 and the end cover 4 is embedded in the concave stop 12. Whether it is the cooperation between the groove 11 and the protrusion 412, or the embedded design of the end cover 4 and the concave stop 12, a precise assembly positioning mechanism is formed, ensuring that the end cover 4 can be accurately aligned with the corresponding position of the motor housing 1 during the assembly process, avoiding looseness or misalignment caused by assembly errors, thereby improving the overall assembly accuracy and stability of the motor.

[0032] As a first implementation of the motor duct, Figure 3 and Figure 4 As shown, a duct 5 is provided outside the motor housing 1, and a first connecting rib 51 is provided between the duct 5 and the motor housing 1. The motor housing 1, the duct 5 and the first connecting rib 51 are an integrated structure. The motor housing 1, the duct 5 and the first connecting rib 51 are made through an integrated molding process to form a solid overall structure. This design significantly improves the strength and stability of the motor housing 1 and its peripheral structure, so that the motor can better withstand various external forces and loads, thereby extending the service life of the motor. At the same time, a duct with a uniform structure is formed between the first connecting rib 51 and the duct 5 and the motor housing 1, which is conducive to optimizing the fluid distribution inside the duct, making the fluid pass more evenly and stably, thereby improving the energy conversion efficiency of the motor.

[0033] As a second embodiment of the motor duct, Figure 5 As shown, the duct shell 6 is also included. The duct shell 6 includes an inner cylinder 61 and an outer cylinder 62. The inner cylinder 61 and the outer cylinder 62 are coaxially arranged. The outer cylindrical surface of the inner cylinder 61 and the inner cylindrical surface of the outer cylinder 62 are provided with a second connecting rib 63. The inner cylinder 61, the outer cylinder 62 and the second connecting rib 63 are an integrated structure, and the motor shell 1 is fixedly installed in the inner cylinder 61. Different from the aforementioned integrated design of the motor shell 1 and the duct shell 5, this solution designs the motor shell 1 and the duct shell 6 as two separable independent components. The advantage of this design is that it allows the duct shell 6 and the motor shell 1 to be quickly disassembled and assembled. Specifically, when it is necessary to replace a motor of different power, the user only needs to replace the main body of the motor without replacing the duct shell 6. In this way, motors of different powers can be flexibly selected according to actual needs, thereby effectively saving resources and costs.

[0034] Further, such as Figure 5As shown, one end of the inner tube 61 is provided with a mounting surface 64, the outer end surface of the front end cover 41 is in contact with the mounting surface 64, and corresponding mounting holes 641 are provided on the front end cover 41 and the mounting surface 64. The outer end surface of the front end cover 41 is closely fitted with the mounting surface 64, ensuring a stable connection between the two. This installation method reduces vibration and noise caused by looseness or gaps, and improves the stability of the entire structure; on the other hand, it does not affect the shape of the duct, thereby facilitating the passage of fluid.

[0035] As a preference, Figure 1 As shown, the rotor assembly 3 includes a motor shaft 31, a rotor 32 and a bearing 33. There are two bearings 33, which are respectively mounted on the front cover 41 and the rear cover 42. The two ends of the motor shaft 31 are rotatably mounted in the two bearings 33, and the rotor 32 is fixedly mounted in the middle of the motor shaft 31. By mounting the two bearings 33 on the front cover 41 and the rear cover 42, respectively, the two ends of the motor shaft 31 are stably supported. This design greatly enhances the rotation stability of the motor shaft 31, reduces the wear caused by vibration and shaking, and thus prolongs the service life of the entire rotor assembly 3.

[0036] As a preference, Figure 2 As shown, a fixing hole 43 is provided at the center of the end cover 4, and the outer ring of the bearing 33 is fixedly connected to the fixing hole 43. Through the design of the standardized fixing hole 43, on the one hand, the assembly process of the motor can be simplified, the assembly difficulty can be reduced, and the assembly error caused by position deviation can be avoided; on the other hand, the connection between the outer ring of the bearing 33 in the rotor assembly 3 and the fixing hole 43 enhances the structural stability of the entire motor and reduces vibration and noise.

[0037] As a preference, Figure 2 As shown, a plurality of heat dissipation holes 44 are provided on the end cover 4, and the heat dissipation holes 44 are arranged at intervals in the circumferential direction. The design of the heat dissipation holes 44 increases the surface area of ​​heat exchange, so that heat can be more effectively transferred from the inside to the external environment. By arranging the heat dissipation holes 44 at intervals in the circumferential direction, it can be ensured that heat is evenly dissipated in multiple directions, avoiding the accumulation of heat in a certain local area, thereby improving the overall heat dissipation efficiency.

[0038] In summary, this type of ducted motor avoids using molds to manufacture the motor housing, effectively reducing the manufacturing cost of the motor housing and giving full play to the cost advantage in the manufacturing of products with multiple specifications.

[0039] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ducted motor, comprising a motor housing, a stator, a rotor assembly and an end cover, wherein the stator is fixedly mounted in the motor housing, and the rotor assembly is mounted in the stator, characterized in that: The motor housing is a pipe with openings at both ends. The end cover includes a front end cover and a rear end cover. The front end cover and the rear end cover are respectively covered at both ends of the motor housing. The two ends of the rotor assembly are respectively mounted on the front end cover and the rear end cover.

2. The ducted motor according to claim 1, characterized in that: A convex stop is provided at one end of the end cover, the cylindrical surface of the convex stop is in contact with the inner wall of the motor housing, the end surface of the convex stop is in contact with the end surface of the motor housing, and the outer cylindrical surface size of the end cover is not larger than the outer cylindrical surface size of the motor housing.

3. The ducted motor according to claim 1, characterized in that: The end cover is integrally embedded in the motor housing, and the outer end surface of the end cover is flush with the end of the motor housing.

4. The ducted motor according to claim 3, characterized in that: The end surface of the motor housing is provided with a groove and the outer cylindrical surface of the end cover is provided with a protrusion matching the groove, or the end surface of the motor housing is provided with a concave stop and the end cover is embedded in the concave stop.

5. The ducted motor according to any one of claims 1 to 4, characterized in that: A duct is provided outside the motor housing, a first connecting rib is provided between the duct and the motor housing, and the motor housing, the duct and the first connecting rib are an integrated structure.

6. The ducted motor according to any one of claims 1 to 4, characterized in that: It also includes a duct shell, which includes an inner cylinder and an outer cylinder. The inner cylinder and the outer cylinder are coaxially arranged. The outer cylindrical surface of the inner cylinder and the inner cylindrical surface of the outer cylinder are provided with a second connecting rib. The inner cylinder, the outer cylinder and the second connecting rib are an integrated structure. The motor shell is fixedly installed in the inner cylinder.

7. The ducted motor according to claim 6, characterized in that: One end of the inner cylinder is provided with a mounting surface, the outer end surface of the front end cover is in contact with the mounting surface, and corresponding mounting holes are provided on the front end cover and the mounting surface.

8. The ducted motor according to claim 7, characterized in that: The rotor assembly includes a motor shaft, a rotor and a bearing. There are two bearings, which are respectively mounted on the front cover and the rear cover. The two ends of the motor shaft are rotatably mounted in the two bearings, and the rotor is fixedly mounted in the middle of the motor shaft.

9. The ducted motor according to claim 8, characterized in that: A fixing hole is provided at the center of the end cover, and the outer ring of the bearing is fixedly connected to the fixing hole.

10. The ducted motor according to claim 1, characterized in that: The end cover is provided with a plurality of heat dissipation holes, and the heat dissipation holes are arranged at intervals in the circumferential direction.

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