Shell for motor, motor and blower

Abstract

The embodiment of the utility model discloses a shell for a motor, the motor and a blower, and the shell for the motor comprises an air inlet part, an air outlet part, an outer surrounding wall and an inner surrounding wall. The outer surrounding wall is fixed to the periphery of the inner surrounding wall in a surrounding mode, a heat dissipation channel communicated with the air outlet part and the air inlet part is arranged in the inner surrounding wall, the heat dissipation channel extends in the axial direction of the inner surrounding wall and is provided with a contraction section, and the area of the cross section of the contraction section is reduced in the air outlet direction from the air inlet part to the air outlet part. The housing used for the motor can carry out efficient heat dissipation on the stator assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a housing for an electric machine, an electric machine and a hair dryer. BACKGROUND

[0002] Small electric machines are widely used in various handheld appliances (such as hair dryers) in modern life. The design of such electric machines not only needs to meet the basic requirements of high efficiency and low noise, but also needs to consider the heat dissipation performance and the stability of installation.

[0003] The existing small electric machine housing generally includes a peripheral wall, an inner wall and a plurality of guide plates arranged between the peripheral wall and the inner wall. The two ends of the peripheral wall form an air inlet portion and an air outlet portion, respectively, so that the stator assembly is arranged on the inner wall. The stator assembly is the core component of the electric machine, and a large amount of heat will be generated during the operation of the electric machine. If the heat cannot be effectively dissipated, the temperature of the electric machine will be too high, which will affect the working efficiency and even cause damage. In order to improve the heat dissipation effect, the current product adopts the method of opening holes on the inner wall to supply airflow to the stator assembly. However, the airflow flow is limited, which makes the heat dissipation effect of the stator assembly unsatisfactory.

[0004] The above content is only used to assist in understanding the technical scheme of the utility model, and does not represent the acknowledgement of the above content as prior art. CONTENT OF THE UTILITY MODEL

[0005] In view of the above problems, the utility model provides a housing for an electric machine, which aims to solve the technical problem of poor heat dissipation effect of the stator assembly.

[0006] In order to achieve the above purpose, the housing for an electric machine provided by the utility model comprises an air inlet portion, an air outlet portion, a peripheral wall and an inner wall.

[0007] The peripheral wall is fixed around the outer periphery of the inner wall.

[0008] The inner wall is provided with a heat dissipation channel communicating with the air inlet portion and the air outlet portion. The heat dissipation channel extends along the axial direction of the inner wall. The heat dissipation channel has a contraction section. In the air outlet direction from the air inlet portion to the air outlet portion, the cross-sectional area of the contraction section is reduced.

[0009] In an embodiment, the heat dissipation channel further has a straight pipe section. In the air outlet direction, the cross-sectional area of the straight pipe section is consistent.

[0010] In an embodiment, the inner wall comprises a first wall surrounding the periphery of the stator assembly and a second wall surrounding the bearing, the first wall and the second wall are connected by a plurality of ribs, the plurality of ribs are spaced around the outer periphery of the second wall, such that two adjacent ribs, the first wall and the second wall form a cooling channel.

[0011] In an embodiment, the contraction section comprises a guide slope provided on at least one of the ribs, the first wall and the second wall.

[0012] In an embodiment, the guide slope forms an angle with the axis of the inner wall, the angle is greater than or equal to 8 degrees and less than or equal to 12 degrees.

[0013] In an embodiment, the ribs, the first wall and the second wall are connected by arcs.

[0014] In an embodiment, the outer wall, the first wall, the plurality of ribs and the second wall are integrally formed.

[0015] In an embodiment, the cooling channel further comprises a straight section, the cross-sectional area of the straight section is consistent in the air outlet direction, the length of the ribs is greater than the sum of the projection of the straight section and the contraction section on the axis of the housing.

[0016] In an embodiment, the first wall is provided with at least one air inlet window in communication with the cooling channel, the air inlet window extends on the first wall to at least one of the two adjacent ribs.

[0017] In an embodiment, the air inlet window is arranged adjacent to the air inlet portion, and the air inlet window penetrates the end wall of the first wall at the air inlet portion in the axial direction of the first wall to form an air inlet gap with the cooling channel.

[0018] In an embodiment, the ratio of the length of the air inlet window to the length of the ribs is greater than or equal to 0.3 and less than or equal to 0.6.

[0019] In an embodiment, the housing further comprises a plurality of guide plates connected between the first wall and the outer wall, the guide plates are connected to the first wall at positions corresponding to the ribs adjacent to one end of the air inlet portion, and the plurality of guide plates and the plurality of ribs are one-to-one corresponding, the air inlet window is located between two adjacent guide plates.

[0020] The utility model discloses still propose a motor, including stator subassembly, rotor subassembly, impeller and the shell for motor as any one embodiment described above, stator subassembly installs in the shell, rotor subassembly installs in the inner wall of the shell, the impeller is located the air inlet of the shell, and with the fixed connection of the rotating shaft of rotor subassembly, the impeller is used for driving airflow by the air inlet of the shell blows to the air outlet, and via the heat dissipation channel blows to stator subassembly.

[0021] The utility model discloses still propose a hair drier, including casing, wind gathering nozzle and the motor as the embodiment described above, the wind gathering nozzle installs at the air outlet of the casing, the motor installs in the casing, to make the air outlet gas flow rate of the shell of the motor be greater than the air outlet gas flow rate of the shell of the motor in the hair drier without being equipped with the wind gathering nozzle

[0022] The utility model discloses a shell for motor is equipped with the heat dissipation channel of the communication air outlet and air inlet in the inner wall, and the heat dissipation channel extends along the axial direction of the inner wall, compared with the heat dissipation hole, this heat dissipation channel can concentrate and guide airflow, thereby effectively improving the cooling and heat dissipation effect of the stator core and winding installed in the inner wall by the airflow entering the heat dissipation channel. Meanwhile, by making the heat dissipation channel have the contraction section, the cross section area of the contraction section is reduced in the air outlet direction, then the Venturi effect can be formed in the heat dissipation channel, effectively increasing the airflow flow and flow rate entering and flowing out the heat dissipation channel, greatly improving the heat dissipation effect of the stator subassembly installed in the inner wall by the heat dissipation channel. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.

[0024] Figure 1 The structure of the shell for motor is shown in the embodiment of the utility model, and the structure of the shell for motor is shown in the embodiment of the utility model.

[0025] Figure 2 For Figure 1 The structure of the shell for motor is shown in the embodiment of the utility model, and the structure of the shell for motor is shown in the embodiment of the utility model.

[0026] Figure 3 For Figure 1 The front view of the shell for motor is shown in the embodiment of the utility model.

[0027] Figure 4 For Figure 3 The section view along IV-IV line of the shell for motor is shown in the embodiment of the utility model.

[0028] Figure 5 ForFigure 4 A perspective view of the structure in the middle;

[0029] Figure 6 A structure schematic view of an embodiment of the motor of the utility model;

[0030] Figure 7 A Figure 6 A cross-sectional view of the motor at an angle;

[0031] Figure 8 A Figure 6 An exploded view of the motor;

[0032] Figure 9 A Figure 8 A cross-sectional view of the motor.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] Reference Name Reference Name Reference Name 1000 Housing 110 Peripheral wall 120 Deflector 100 Inner wall 130 First wall 131 Stator mounting cavity 132 Air inlet window 133 Contraction section 134 Straight pipe section 140 Rib 150 Second wall 160 Annular air duct 161 Air inlet portion 162 Air outlet portion 170 Heat dissipation channel 200 Stator assembly 300 Rotor assembly 310 Shaft 320 Bearing structure 400 Impeller

[0035] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all 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 labor fall within the scope of protection of the present application. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is also not within the protection scope required by the utility model.

[0037] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, if the certain posture changes, the directional indications will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text is to include three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies both A and B.

[0039] This utility model proposes a housing for an electric motor.

[0040] In this embodiment of the utility model, please refer to Figures 1 to 5 , Figure 7 The housing 1000 for the motor includes an air inlet 161, an air outlet 162, an outer wall 110, and an inner wall 100. The outer wall 110 is fixed around the periphery of the inner wall 100. The inner wall 100 is provided with a heat dissipation channel 170 that connects the air outlet 162 and the air inlet 161. The heat dissipation channel 170 extends axially along the inner wall 100 and has a constriction section 133. In the air outlet direction from the air inlet 161 to the air outlet 162, the cross-sectional area of ​​the constriction section 133 is reduced.

[0041] In this embodiment, the housing 1000 can be made of materials such as aluminum alloy, cast iron, stainless steel, copper, or zinc, and the choice can be made according to actual usage requirements; no specific limitation is made here. Specifically, the outer wall 110 and the inner wall 100 are cylindrical. The two ends of the outer wall 110 form an air inlet 161 and an air outlet 162, respectively. The inner wall 100 is used for mounting the stator assembly 200. The stator assembly 200 can be installed in the stator mounting cavity 131 formed by the inner wall 100, or it can be installed at the end of the inner wall 100. The outer wall 110 and the inner wall 100 enclose each other to form an annular air duct 160 connecting the air inlet 161 and the air outlet 162. The outer wall 110 and the inner wall 100 can be connected by multiple guide plates 120. To ensure structural strength, the outer wall 110, the inner wall 100, and the multiple guide plates 120 are integrally formed and connected. Multiple guide vanes 120 are spaced apart around the outer perimeter of the inner wall 100, and each guide vane 120 extends obliquely along the axial direction of the annular air duct 160. That is, the extension direction of the air guiding surface of the guide vane 120 intersects both the axial and radial directions of the annular air duct 160. In this way, the airflow entering the annular air duct 160 can be guided and diffused by the multiple guide vanes 120. The number of guide vanes 120, the spacing between two adjacent guide vanes 120, and the distance between the inner wall 100 and the outer wall 110 can be designed according to the specifications of the motor, and are not specifically limited here.

[0042] It should be noted that the heat dissipation channel 170 refers to a cavity with a certain extension length, and the extension length of the heat dissipation channel 170 is greater than the maximum width of the cross-sectional area compared with the heat dissipation hole. The heat dissipation channel 170 extends along the axial direction of the inner wall 100, and then the heat dissipation channel 170 can extend in a direction parallel to the axis of the inner wall 100, or extend in a direction with a certain inclination angle with respect to the axis of the inner wall 100, or simultaneously include both, that is, part of the heat dissipation channel 170 extends in a direction parallel to the axis of the inner wall 100, and the other part extends in a direction with a certain inclination angle with respect to the axis of the inner wall 100, as long as the overall extension direction of the heat dissipation channel 170 is along the axial direction of the inner wall 100. It can be understood that in order to be able to arrange the heat dissipation channel 170 in the axial direction of the inner wall 100, the inner wall 100 should have a certain thickness, and the specific thickness can be designed according to the requirements, which is not limited here. The number of heat dissipation channels 170 and the cross-sectional shape thereof can be designed according to actual requirements, which is not specifically limited here. It can be understood that the stator assembly 200 is installed at one end of the inner wall 100 adjacent to the air outlet portion 162. The impeller 400 is usually installed at the air inlet portion 161, and a reasonable distance should exist between the impeller 400 and the end wall of the inner wall 100, so that the impeller 400 drives the airflow to flow from the air inlet portion 161 into the annular air duct 160, and at the same time, the airflow of the air inlet portion 161 can also be driven to flow through the heat dissipation channel 170 to the stator assembly 200 and then to the air outlet portion 162, so as to dissipate heat and cool the stator assembly 200 installed on the inner wall 100. The airflow of the air inlet portion 161 can flow through the heat dissipation channel 170 to the stator assembly 200 and then to the air outlet portion 162, so the heat dissipation channel 170 is in communication with the air inlet portion 161 and the air outlet portion 162. It should be further noted that the airflow driven by the impeller 400 flows into the heat dissipation channel 170 from one end, that is, the air inlet end, and flows out from the other end, that is, the air outlet end, and at this time, the space part where the air inlet end of the heat dissipation channel 170 is located can also be referred to as the air inlet portion, and the space part where the air outlet end of the heat dissipation channel 170 is located can be referred to as the air outlet portion.

[0043] In the air outlet direction, the cross-sectional area of the contraction section 133 can uniformly change and decrease, or can not uniformly change and decrease. In order to reduce the air resistance and improve the smoothness of air outlet, the cross-sectional area of the contraction section 133 is optionally arranged to gradually decrease in the air outlet direction. It can be understood that the cross-sectional area of the contraction section 133 in the air outlet direction can be reduced by reducing the length and / or width of the cross section of the contraction section 133 in the air outlet direction. In other words, the inner wall surface of the contraction section 133 has an inclined surface at an angle with respect to the axis of the inner wall 100, and the cross-sectional area of the contraction section 133 is arranged to decrease in the air outlet direction by arranging the inclined surface. The inclined surface can be the entire inner wall surface of the contraction section 133, or can be only one side or both sides of the inner wall surface in the width direction or the length direction of the contraction section 133.

[0044] By setting the contraction section 133 in the heat dissipation channel 170 of the inner wall 100, the cross-sectional area of the contraction section 133 is arranged to decrease in the air outlet direction, so that the cross-sectional area of the heat dissipation channel 170 changes at the contraction section 133. Thus, the air flow entering the heat dissipation channel 170 forms a Venturi effect at the contraction section 133, that is, the air flow velocity increases when the air flow flows through the contraction section 133, so that the air flow flowing out of the heat dissipation channel 170 has an increased flow rate and generates a low pressure area, thereby increasing the suction effect on the surrounding fluid, so that the air flow entering and flowing out of the heat dissipation channel 170 increases. When the motor using the shell 1000 is applied to a hair dryer, and the hair dryer is installed with a wind collecting nozzle, the wind collecting nozzle also forms a Venturi effect, so that the air flow from the heat dissipation channel 170 to the wind collecting nozzle has an increased flow rate. At the same time, the air flow blown out through the contraction section 133 can be more concentrated to the stator assembly 200, so as to further improve the heat dissipation effect of the stator assembly 200.

[0045] The shell 1000 for the motor is provided with the heat dissipation channel 170 communicating the air outlet portion 162 and the air inlet portion 161 in the inner wall 100. The heat dissipation channel 170 extends along the axial direction of the inner wall 100. Compared with the heat dissipation hole, the heat dissipation channel 170 can concentrate and guide the air flow, thereby effectively improving the cooling effect of the air flow entering the heat dissipation channel 170 on the stator core and winding installed in the inner wall 100. At the same time, by arranging the contraction section 133 in the heat dissipation channel 170, the cross-sectional area of the contraction section 133 is arranged to decrease in the air outlet direction, so that the heat dissipation channel 170 can form a Venturi effect, effectively increasing the air flow rate and flow rate of the air flow entering and flowing out of the heat dissipation channel 170, and greatly improving the heat dissipation effect of the heat dissipation channel 170 on the stator assembly 200 installed in the inner wall 100.

[0046] In an embodiment, as shown in Figure 4 , Figure 5 and Figure 7 , the heat dissipation channel 170 also has a straight pipe section 134. In the air outlet direction, the cross-sectional area of the straight pipe section 134 is consistent. The straight pipe section 134 can be arranged at the leading end and / or trailing end of the contraction section 133. In the air outlet direction, the cross-sectional area of the straight pipe section 134 is consistent, that is, the cross-sectional area of the straight pipe section 134 does not change. Thus, the axis of the straight pipe section 134 is arranged in parallel with the axis of the inner wall 100. By arranging the straight pipe section 134, the flow rate increasing area of the contraction section 133 is formed, so that a large amount of air flow entering the heat dissipation channel 170 is guided and concentrated through the straight pipe section 134, so as to reduce turbulence and reduce abnormal noise.

[0047] In an embodiment, please refer to Figures 1 to 5The inner wall 100 comprises a first wall 130 surrounding the stator assembly 200 and a second wall 150 surrounding the bearing. The first wall 130 and the second wall 150 are connected by a plurality of ribs 140. The plurality of ribs 140 are spaced around the second wall 150 so that the adjacent two ribs 140, the first wall 130 and the second wall 150 form a heat dissipation channel 170.

[0048] In the embodiment, the first wall 130 forms a stator mounting cavity 131 for mounting the stator assembly 200. The stator mounting cavity 131 is in communication with the heat dissipation channel 170. When the stator assembly 200 is mounted in the stator mounting cavity 131, the airflow can flow to the stator assembly 200 through the heat dissipation channel 170 to timely remove the heat of the stator assembly 200, thereby effectively cooling the stator assembly 200. The second wall 150 forms a bearing seat for mounting the bearing of the rotor assembly 300. The length and thickness of the second wall 150 can be designed according to the specific size of the bearing mechanism, which is not limited herein. The number and width of the ribs 140 can also be designed and selected according to different requirements. The first wall 130, the ribs 140 and the second wall 150 can be integrally connected. The embodiment fully utilizes the space between the first wall 130 and the second wall 150 to form the heat dissipation channel 170, which improves the heat dissipation effect of the stator assembly 200 without excessively reducing the structural strength of the housing 1000. The heat dissipation channel 170 is formed between the adjacent two ribs 140, the outer circumferential surface of the second wall 150 and the inner circumferential surface of the first wall 130, so that the housing 1000 has a plurality of heat dissipation channels 170 arranged at intervals in the circumferential direction, which can perform omnidirectional heat dissipation on the circumferential direction of the stator assembly 200.

[0049] Further, the contraction section 133 comprises a flow guide slope provided on at least one of the ribs 140, the first wall 130 and the second wall 150. That is, the flow guide slope can be provided on any one or more of the first wall 130, the second wall 150 and the ribs 140. It can be understood that the flow guide slope is arranged at an angle with the extension direction of the inner wall 100 in the axial direction, and the specific angle can be selected and designed according to actual requirements, which is not limited herein. The flow guide slope makes the contraction section 133 uniformly tapered in the air outlet direction, which can reduce the air resistance, improve the smoothness of the airflow, thereby reducing turbulence and abnormal noise. Alternatively, the first wall 130 is provided with the flow guide slope. In this way, the thickness of the first wall 130 can be reduced, thereby reducing the air resistance and increasing the flow rate of the airflow.

[0050] Further, the included angle between the guide slope and the axis of the inner wall 100 is greater than or equal to 8 degrees and less than or equal to 12 degrees. The included angle between the guide slope and the axis of the inner wall 100 can be 8 degrees, 9 degrees, 10 degrees, 12 degrees, etc. If the inclination angle of the guide slope is too large, the structural strength of the inner wall 100 at the contraction section 133 will be reduced. If the inclination angle of the guide slope is too small, it is difficult to improve the flow rate of the gas in the contraction section 133, the effect of forming the Venturi effect is not obvious, and thus the flow rate improvement effect of the heat dissipation channel 170 is not obvious. By making the included angle between the guide slope and the axis of the inner wall 100 greater than or equal to 8 degrees and less than or equal to 12 degrees, the structural strength of the inner wall 100 at the contraction section 133 is ensured while effectively improving the airflow of the heat dissipation channel 170.

[0051] In an embodiment, referring to Figures 1 to 3 , the ribs 140 are connected to the first wall 130 and the second wall 150 in a circular arc transition. In this way, while maximizing the cross section of the heat dissipation channel 170, the airflow blown out through the heat dissipation channel 170 is more concentrated and soft, so as to reduce the wind resistance and improve the wind speed. At the same time, the ribs 140 are connected to the bearing seat and the inner wall 100 in a circular arc transition, which can improve the structural strength of the entire housing 1000 for the motor. It can be understood that the ribs 140 are connected to the bearing seat and the inner wall 100 in a large circular arc angle transition, so that the cross section of the heat dissipation channel 170 is substantially in a waist shape.

[0052] In an embodiment, as shown in Figures 1 to 5 , the peripheral wall 110, the first wall 130, the plurality of ribs 140, and the second wall 150 are integrally formed. In this way, the overall structural strength is higher. Compared with the scheme of embedding the second wall 150 for mounting the bearing into the first wall 130, the embodiment integrally forms the peripheral wall 110, the first wall 130, the plurality of ribs 140, and the second wall 150, which can improve the concentricity between the second wall 150 and the first wall 130 and the peripheral wall 110, and can realize the function of reducing noise, while saving costs in the process of processing.

[0053] In combination with the above embodiment having the first wall 130 and the second wall 150, further, as shown in Figure 4 and Figure 7 , the heat dissipation channel 170 further has a straight pipe section 134, the cross-sectional area of the straight pipe section 134 is consistent in the air outlet direction; and the length of the rib 140 is greater than the sum of the projection of the straight pipe section 134 and the contraction section 133 on the axis of the housing 1000.

[0054] The straight pipe section 134 can be arranged at the leading end and / or the trailing end of the converging section 133. By arranging the straight pipe section 134, the flow velocity increasing area of the converging section 133 is formed, so that the large amount of airflow entering the heat dissipation channel 170 is guided and concentrated through the straight pipe section 134, so as to reduce turbulence and reduce abnormal sound. It can be understood that, since the heat dissipation channel 170 is formed by the two adjacent ribs 140, the first enclosing wall 130 and the second enclosing wall 150, by making the length of the rib 140 greater than the sum of the projection of the straight pipe section 134 and the converging section 133 on the axis of the shell 1000, the length of the heat dissipation channel 170 can be increased, so that the airflow flowing into the heat dissipation channel 170 from the flow guiding slope can be further rectified and stabilized by the straight pipe section 134 and the other parts of the converging section 133, so that the airflow blown by the heat dissipation channel 170 to the stator assembly 200 is more stable. At the same time, the overall structural strength of the motor shell 1000 can also be improved.

[0055] In combination with the above embodiment with the first enclosing wall 130 and the second enclosing wall 150, further referring to Figures 1 to 5 、 Figure 7 The first enclosing wall 130 is provided with at least one air inlet window 132 communicating with the heat dissipation channel 170, and the air inlet window 132 extends to at least one of the two adjacent ribs 140 on the first enclosing wall 130.

[0056] In this embodiment, the air inlet window 132 is arranged through the peripheral wall of the first enclosing wall 130. The number of air inlet windows 132 can be one or more. In order to improve the heat dissipation effect, the air inlet window 132 is optionally arranged in multiple, and the multiple air inlet windows 132 are arranged at intervals around the circumference of the inner enclosing wall 100, and each heat dissipation channel 170 is provided with at least one air inlet window 132. In this way, each heat dissipation channel 170 is provided with one air inlet window 132, so that the entire motor shell 1000 has a sufficient number of air inlet windows 132, and the multiple air inlet windows 132 are arranged at intervals along the outer circumference of the second enclosing wall 150, so as to improve the air inlet amount of the multiple heat dissipation channels 170 as a whole in the entire circumferential direction. The shape of the air inlet window 132 can also be various, such as circular, rectangular, semicircular, oval, etc., which are not limited here. The size of the air inlet window 132 can also be various, so that a large heat dissipation window or multiple small heat dissipation windows can be arranged at the position of the inner enclosing wall 100 corresponding to each heat dissipation channel 170.

[0057] By opening the air inlet window 132 on the first enclosing wall 130 in communication with the heat dissipation channel 170, the airflow flowing from the air inlet portion 161 can flow into the heat dissipation channel 170 from the radial direction of the first enclosing wall 130 through the air inlet window 132, so that the airflow can enter the heat dissipation channel 170 from both the radial direction and the axial direction, effectively increasing the air inlet dimension and the air inlet area of the heat dissipation channel 170, and greatly improving the heat dissipation effect of the stator assembly 200 installed on the inner enclosing wall 100.

[0058] Optionally, the air inlet window 132 extends to two adjacent ribs 140 in the circumferential direction of the first enclosing wall 130. That is, the air inlet window 132 is formed between the two adjacent ribs 140, so that the width of the air inlet window 132 can be maximized to increase the air inlet area of the air inlet window 132 and improve the heat dissipation effect.

[0059] Further, as shown in Figure 1 , Figure 3 and Figure 5 , the air inlet window 132 is arranged adjacent to the air inlet portion 161, and the air inlet window 132 penetrates the end wall of the first enclosing wall 130 at the air inlet portion 161 in the axial direction of the first enclosing wall 130 to form an air inlet gap with the heat dissipation channel 170.

[0060] In the present embodiment, it should be noted that adjacent here means immediately adjacent. That is, the distance from the air inlet window 132 to the air inlet end of the heat dissipation channel 170 is less than the distance from the air inlet window 132 to the air outlet end of the heat dissipation channel 170. By arranging the air inlet window 132 adjacent to the air inlet portion 161, the flow path of the airflow from the air inlet portion 161 into the air inlet window 132 can be shortened. By penetrating the end wall of the first enclosing wall 130 at the air inlet portion 161 in the axial direction of the first enclosing wall 130, the air inlet window 132 is in communication with the air inlet end of the heat dissipation channel 170 to form an air inlet gap for air inlet in both the axial direction and the radial direction. In this way, there is no obstruction between the air inlet window 132 and the air inlet end of the heat dissipation channel 170, which can increase the overall air inlet area of the heat dissipation channel 170, reduce the air inlet resistance, and effectively improve the air inlet amount and the air inlet speed in the heat dissipation channel 170, thereby improving the overall heat dissipation efficiency.

[0061] Further, please refer to Figure 4 and Figure 7 , in the air outlet direction, the ratio of the length of the air inlet window 132 to the length of the rib 140 is greater than or equal to 0.3 and less than or equal to 0.6.

[0062] In the embodiment, the ratio of the length of the air inlet window 132 to the length of the rib 140 can be 0.3, 0.35, 0.4, 0.43, 0.5, 0.55, 0.6, etc. When the ratio of the length of the air inlet window 132 to the length of the rib 140 is less than 0.3, the length of the air inlet window 132 is too short, and the area of the air inlet window 132 is small, so that the air inlet amount in the heat dissipation air duct is not obviously improved. When the ratio of the length of the air inlet window 132 to the length of the rib 140 is greater than 0.6, the length of the air inlet window 132 is too long, which on the one hand makes the connection between the rib 140 and the first surrounding wall 130 unstable, and on the other hand affects the installation of the guide plate 120. In the air outlet direction, by making the ratio of the length of the air inlet window 132 to the length of the rib 140 greater than or equal to 0.3 and less than or equal to 0.6, the area of the air inlet window 132 is maximized while ensuring the reliable connection between the rib 140 and the first surrounding wall 130 and not affecting the installation of the guide plate 120, so that the air inlet amount in the heat dissipation channel 170 can be effectively improved to achieve efficient heat dissipation of the stator assembly 200.

[0063] In an embodiment, as shown in Figures 1 to 3 , Figure 8 and Figure 9 , the shell 1000 further comprises a plurality of guide plates 120 connected between the first surrounding wall 130 and the peripheral wall 110, the guide plate 120 is connected to the position corresponding to the rib 140 of the first surrounding wall 130 adjacent to one end of the air inlet part 161, and the plurality of guide plates 120 and the plurality of ribs 140 are one-to-one corresponding, and the air inlet window 132 is located between the adjacent two guide plates 120.

[0064] In the embodiment, it can be understood that the position where the first surrounding wall 130 is provided with the rib 140 has a large overall wall thickness, so the structural strength is high. Since the guide plate 120 is subjected to a large force at the end adjacent to the air inlet part 161, the connection strength requirement is higher. By connecting the guide plate 120 to the position corresponding to the rib 140 of the first surrounding wall 130 adjacent to one end of the air inlet part 161, the structural strength of the connection part of the guide plate 120 adjacent to the air inlet part 161 can be ensured, so that the installation of the guide plate 120 and the first surrounding wall 130 is more stable and reliable. By one-to-one corresponding arrangement of the plurality of guide plates 120 and the plurality of ribs 140, the number of heat dissipation channels 170 is consistent with the number of ventilation channels formed between the adjacent two guide plates 120, so that the structural strength between the end of each guide plate 120 adjacent to the air inlet part 161 and the first surrounding wall 130 can be ensured. The air inlet window 132 is located between the adjacent two guide plates 120, so that the guide plate 120 does not interfere with the air inlet of the heat dissipation channel 170 at the air inlet window 132.

[0065] The utility model further proposes a motor, please refer to Figures 6 to 9The motor comprises a stator assembly 200, a rotor assembly 300, an impeller 400 and a housing 1000 for the motor, the specific structure of the housing 1000 for the motor is referred to the above-mentioned embodiments, the stator assembly 200 is installed in the housing 1000, the rotor assembly 300 is installed in the inner surrounding wall 100 of the housing 1000, the impeller 400 is arranged in the air inlet part 161 of the housing 1000 and is fixedly connected with the rotating shaft 310 of the rotor assembly 300; the impeller 400 is used for driving the airflow to be blown from the air inlet part 161 of the housing 1000 to the air outlet part 162 and to the stator assembly 200 through the heat dissipation channel 170. Since all the technical solutions of the above-mentioned embodiments are adopted in the motor, all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are at least achieved, which will not be repeated here.

[0066] In the embodiment, the stator assembly 200 comprises a bobbin and a stator core arranged at the outer periphery of the bobbin, and the bobbin is wound with a winding. The specific structure and connection mode of the bobbin, the stator core, the rotating shaft 310, the bearing structure and the impeller 400 can be referred to the existing design, which is not limited here. The number of blades can be selected and designed according to actual needs, which is not limited here. Specifically, the rotor assembly 300 further comprises a magnet, the rotating shaft 310 is sequentially arranged through the magnet, the bearing structure and the impeller 400, and the magnet is arranged in the bobbin of the stator assembly 200. The stator assembly 200 is arranged in the first surrounding wall 130 of the inner surrounding wall 100, the bearing structure is arranged in the second surrounding wall 150 of the inner surrounding wall 100, and the impeller 400 is fixedly connected with the end of the rotating shaft 310 away from the stator assembly 200, so as to drive the airflow to enter the annular air duct 160 and the heat dissipation channel 170 between the inner surrounding wall 100 and the outer surrounding wall 110 from the air inlet part 161, and finally blow to the air outlet part 162 and the stator assembly 200. When the motor is applied to a hair dryer, the hair dryer is installed with a wind gathering nozzle, and the wind gathering nozzle also forms a Venturi effect, so that the airflow from the heat dissipation channel 170 to the wind gathering nozzle has a faster flow rate.

[0067] The utility model also proposes a hair dryer, the hair dryer includes a casing, a wind gathering nozzle and a motor, the specific structure of the motor is referred to the above-mentioned embodiments, the wind gathering nozzle is installed at the air outlet of the casing, and the motor is installed in the casing, so that the flow rate of the gas of the air outlet part 162 of the housing 1000 of the motor is greater than the flow rate of the gas of the air outlet part 162 of the housing 1000 of the motor arranged in the hair dryer without the wind gathering nozzle.

[0068] In the present embodiment, the shape of the casing of the hair dryer can be selected and designed according to the type of the hair dryer, which is not specifically limited herein. The shape of the air-converging nozzle can also refer to the existing design, and the air-converging nozzle can be detachably fixed to the air outlet of the casing by magnetic attraction, clamping or the like. It can be understood that the air-converging nozzle arranged at the air outlet of the casing can also form a Venturi effect to concentrate the airflow and improve the blowing speed. By using the above-mentioned motor for the hair dryer with the air-converging nozzle, compared with the hair dryer without the air-converging nozzle, the Venturi effect is formed in the air-converging nozzle and in the heat dissipation channel 170 of the casing 1000 of the motor, and the entire hair dryer system forms twice the Venturi effect, so that the airflow speed from the heat dissipation channel 170 to the air-converging nozzle is accelerated, thereby improving the air speed and air volume of the entire hair dryer.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not drive the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A housing for an electric motor, the housing comprising an air inlet and an air outlet, characterized in that, The shell also includes an outer perimeter wall and an inner perimeter wall; wherein... The outer perimeter wall is fixed around the perimeter of the inner perimeter wall; The inner wall is provided with a heat dissipation channel connecting the air outlet and the air inlet. The heat dissipation channel extends axially along the inner wall and has a contraction section. In the air outlet direction from the air inlet to the air outlet, the cross-sectional area of ​​the contraction section is reduced.

2. The housing for an electric motor as described in claim 1, characterized in that, The heat dissipation channel also has straight pipe sections, and the cross-sectional area of ​​the straight pipe sections is consistent in the air outlet direction.

3. The housing for an electric motor as described in claim 1, characterized in that, The inner enclosure includes a first enclosure for surrounding the stator assembly and a second enclosure for surrounding the bearing. The first enclosure and the second enclosure are connected by multiple ribs, which are spaced around the outer periphery of the second enclosure so that adjacent ribs, the first enclosure, and the second enclosure form a heat dissipation channel.

4. The housing for an electric motor as described in claim 3, characterized in that, The contraction section includes a guide slope provided on at least one of the ribs, the first enclosure wall, and the second enclosure wall.

5. The housing for an electric motor as described in claim 4, characterized in that, The angle between the guide slope and the axis of the inner wall is greater than or equal to 8 degrees and less than or equal to 12 degrees.

6. The housing for an electric motor as described in claim 5, characterized in that, The ribs are connected to both the first and second enclosure walls by a rounded transition.

7. The housing for an electric motor as described in claim 5, characterized in that, The outer wall, the first enclosure wall, multiple ribs, and the second enclosure wall are integrally formed.

8. The housing for an electric motor as described in any one of claims 3 to 7, characterized in that, The heat dissipation channel also has a straight pipe section, and the cross-sectional area of ​​the straight pipe section is consistent in the air outlet direction; the length of the rib is greater than the sum of the projections of the straight pipe section and the contraction section on the axis of the housing.

9. The housing for an electric motor as claimed in any one of claims 3 to 7, characterized in that, The first enclosure has at least one air inlet window communicating with the heat dissipation channel, and the air inlet window extends on the first enclosure toward at least one of the two adjacent ribs.

10. The housing for an electric motor as described in claim 9, characterized in that, The air inlet window is disposed adjacent to the air inlet section, and the air inlet window penetrates the end wall of the first enclosure wall at the air inlet section in the axial direction of the first enclosure wall, so as to form an air inlet gap with the heat dissipation channel.

11. The housing for an electric motor as claimed in claim 10, characterized in that, The ratio of the length of the air inlet window to the length of the rib is greater than or equal to 0.3 and less than or equal to 0.

6.

12. The housing for an electric motor as claimed in claim 11, characterized in that, The housing also includes a plurality of guide plates connected between the first enclosure and the outer perimeter wall. One end of the guide plate adjacent to the air inlet is connected to the position of the first enclosure corresponding to the rib. The plurality of guide plates are arranged in a one-to-one correspondence with the plurality of ribs. The air inlet window is located between two adjacent guide plates.

13. An electric motor, characterized in that, The device includes a stator assembly, a rotor assembly, an impeller, and a housing for an electric motor as described in any one of claims 1 to 12. The stator assembly is mounted in the housing, the rotor assembly is mounted within the inner wall of the housing, and the impeller is disposed in the air inlet of the housing and fixedly connected to the shaft of the rotor assembly. The impeller is used to drive airflow from the air inlet of the housing to the air outlet and through a heat dissipation channel to the stator assembly.

14. A hair dryer, characterized in that, The device includes a housing, a concentrator nozzle, and a motor as described in claim 13. The concentrator nozzle is installed at the air outlet of the housing, and the motor is installed inside the housing such that the air velocity at the outlet of the motor housing is greater than the air velocity at the outlet of the motor housing in a blower without a concentrator nozzle.

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