Electric motor for automobile condenser, and fan device

Abstract

The embodiments of the present application belong to the technical field of heat dissipation of condensers, and relate to an electric motor for an automobile condenser, and a fan device. The electric motor comprises a circuit board, a support, a rotor and stator assembly, a rear cover and a ventilation assembly, wherein the support is connected to the circuit board, and a ventilation hole is provided in the support; the rotor and stator assembly is electrically connected to the circuit board; the rear cover is in sealed connection with the support, and a cavity is formed between the rear cover and the support; and the ventilation assembly comprises a water absorption member, and condensed water vapor formed in the cavity is absorbed by the water absorption member when same flows through the ventilation hole. The electric motor provided in the embodiments of the present application can effectively ensure that the environment inside the cavity remains dry, thereby guaranteeing the normal working performance of the electric motor, and improving the working stability of the electric motor. In addition, the water absorption member can further block dust and water vapor outside the cavity from entering, thereby avoiding damage to the circuit board inside the cavity.

Description

Motor and fan device for automobile condenser Technical Field

[0001] The present application relates to the technical field of condenser heat dissipation, and in particular to a motor and fan device for an automobile condenser. Background Art

[0002] The car condenser is a crucial component of the vehicle's air conditioning system, ensuring efficient cooling and dehumidification. Typically, the condenser is paired with a condenser fan, which is installed from the front to the rear of the vehicle. The condenser fan increases air flow and improves heat dissipation.

[0003] While the car is moving, the wind generated by the vehicle's forward motion helps dissipate heat from the condenser. However, when the car is driving at low speed or parked, the condenser fan plays a crucial role. By drawing air in from the front of the car and exhausting it, the condenser fan increases air flow and further improves the cooling effect.

[0004] During operation, the motor has strict requirements on its waterproof structure. Generally, the parts of the motor that need to be waterproof are sealed, such as the seal between the base and the back cover, the seal at the lead wires, and the seal at the stator pins.

[0005] However, the temperature difference between the inside and outside of the motor will form condensed water vapor inside the motor. If the condensed water vapor cannot be discharged in time, the condensed water vapor will condense into water droplets and may adhere to the circuit board, causing the chip to short-circuit and affecting the normal working performance of the motor.

[0006] Summary of the Invention

[0007] In view of this, embodiments of the present application provide a motor for an automobile condenser to solve at least one problem existing in the background technology.

[0008] In a first aspect, an embodiment of the present application provides a motor for an automobile condenser, comprising:

[0009] Circuit board;

[0010] a bracket connected to the circuit board, the bracket being provided with a vent hole;

[0011] a rotor-stator assembly electrically connected to the circuit board;

[0012] a rear cover, which is sealed with the bracket, the bracket being located between the rear cover and the rotor-stator assembly, a cavity being formed between the rear cover and the bracket, and the circuit board being located in the cavity;

[0013] The ventilation component comprises a water absorbing member, wherein the water absorbing member is located in the ventilation hole, the ventilation hole is connected to the cavity, and the condensed water vapor formed in the cavity is absorbed by the water absorbing member when flowing through the ventilation hole.

[0014] In combination with the first aspect of the present application, in an optional embodiment, the air vent includes a first through hole and a second through hole that are connected, one end of the first through hole is connected to the second through hole, and the other end is connected to the cavity, and the diameter of the first through hole is larger than the diameter of the second through hole.

[0015] In combination with the first aspect of the present application, in an optional embodiment, the ratio of the diameter of the second through hole to the diameter of the first through hole is in the range of . to .

[0016] In combination with the first aspect of the present application, in an optional embodiment, the water absorbing member is located in the first through hole.

[0017] In combination with the first aspect of the present application, in an optional embodiment, the breathable component further includes a locking member, the locking member abuts against the inner wall of the first through hole, and the water absorbing member is located between the locking member and the bottom wall of the first through hole.

[0018] In combination with the first aspect of the present application, in an optional embodiment, the water absorbing member is located on the bottom wall of the first through hole, the locking member covers the surface of the water absorbing member, and the shape of the water absorbing member matches the shape of the bottom wall of the first through hole.

[0019] In conjunction with the first aspect of the present application, in an optional embodiment, the locking member is a cylinder, the outer diameter of the cylinder is larger than the inner wall diameter of the first through hole, and the cylinder is interference fit with the first through hole.

[0020] The column is provided with a third through hole, and the third through hole corresponds to the second through hole.

[0021] In combination with the first aspect of the present application, in an optional embodiment, the diameter of the third through hole is greater than or equal to the diameter of the second through hole.

[0022] In combination with the first aspect of the present application, in an optional embodiment, the stator-rotor assembly includes a stator assembly and a rotor assembly, the rotor assembly surrounds the periphery of the stator assembly, the rotor assembly includes a rotor shell, there is a gap between the end of the rotor shell and the bracket, the position of the rotor assembly corresponding to the air vent is close to the outer wall of the rotor shell, and the air vent is connected to the gap.

[0023] In conjunction with the first aspect of the present application, in an optional embodiment, the stator assembly includes a stator mounting frame, a stator core, and a stator winding, wherein the stator winding is wound on the stator core, the stator core is connected to the stator mounting frame, and the stator mounting frame is connected to the bracket;

[0024] The rotor-stator assembly also includes:

[0025] A connecting assembly comprising a first bearing, a second bearing, and an output shaft, wherein the first bearing and the second bearing are both sleeved on the output shaft, the bracket extends to form a bearing cavity, the first bearing and the second bearing are connected to the inner wall of the bearing cavity, and the first bearing, the second bearing, and the output shaft are coaxial;

[0026] The rotor assembly includes a magnetic steel connected to the inner wall of the rotor housing. The rotor housing is connected to the output shaft. The rotor housing and the magnetic steel rotate along with the output shaft.

[0027] In conjunction with the first aspect of the present application, in an optional embodiment, the first bearing is located at an end of the bearing cavity close to the circuit board, and the first bearing has a transition fit with the output shaft and an interference fit with the bearing cavity.

[0028] The second bearing is located at one end of the bearing cavity away from the circuit board. The second bearing has an interference fit with the output shaft and a transition fit with the bearing cavity.

[0029] In combination with the first aspect of the present application, in an optional embodiment, the side wall of the bearing cavity is made of metal.

[0030] In combination with the first aspect of the present application, in an optional embodiment, the connecting assembly further includes a limit member, which is clamped between the first bearing and the output shaft, and / or between the second bearing and the inner wall of the bearing cavity.

[0031] In combination with the first aspect of the present application, in an optional embodiment, the limiting member is a first retaining spring and / or a wave washer.

[0032] In combination with the first aspect of the present application, in an optional embodiment, a plurality of rivet blocks are provided on the side wall of the bracket, and a plurality of rivet grooves are formed outwardly on the edge of the back cover, the rivet grooves are interference fit on the rivet blocks, and the rivet grooves have recessed ribs, which abut against the surface of the side wall of the bracket to fix the back cover to the bracket.

[0033] In combination with the first aspect of the present application, in an optional embodiment, the back cover is made of metal, and the recessed ribs are formed on the rivet grooves by a riveting process.

[0034] In a second aspect, an embodiment of the present application further provides a fan device for an automobile condenser, comprising any one of the motors for an automobile condenser provided in the first aspect; and further comprising:

[0035] The fan blade is connected to the output shaft of the rotor-stator assembly, and the fan blade includes a mounting portion and a plurality of blades surrounding and connected to the mounting portion. The mounting portion corresponds to the motor, and the mounting portion is provided with a plurality of heat dissipation holes.

[0036] The rotor-stator assembly has a first end and a second end that are oppositely arranged along its axial direction, an air inlet is formed at the first end of the rotor-stator assembly facing the fan blade, and a gap is formed between the second end facing the bracket and the bracket;

[0037] A first airflow flowing from the blades to the motor acts on the periphery of the rotor-stator assembly;

[0038] The second airflow flowing from the heat dissipation through-hole to the motor at least partially enters the interior of the motor through the air inlet, flows out at the gap, and then merges into the first airflow.

[0039] In combination with the second aspect of the present application, in an optional embodiment, the orthographic projection of the rotor housing of the stator-rotor assembly in the first plane perpendicular to the rotation axis of the motor is located outside the orthographic projection of the blade in the first plane, and the orthographic projection of the rotor housing of the stator-rotor assembly in the first plane perpendicular to the rotation axis of the motor at least partially overlaps with the orthographic projection of the heat dissipation through-hole in the first plane.

[0040] In combination with the second aspect of the present application, in an optional embodiment, a fourth through hole for connecting the output shaft is provided on the mounting portion, the axis of the mounting portion is colinearly arranged with the axis of the output shaft and rotates synchronously, and a plurality of the heat dissipation through holes are distributed on the mounting portion with the fourth through hole as the center.

[0041] In combination with the second aspect of the present application, in an optional embodiment, along the radial direction of the fan blade, the first inner wall of the arc through hole is located on the outside of its second inner wall, the first inner wall and the second inner wall of the arc through hole correspond to the outer wall of the outer casing of the motor and the outer casing shell, and the second inner wall of the arc through hole is located on the outside of the inner wall of the outer casing of the motor.

[0042] In combination with the second aspect of the present application, in an optional embodiment, the two ends of the arc through hole extend to form edge through holes, and the edge through holes correspond to the air inlet on the rotor shell of the stator assembly, and the air inlet includes at least a fifth through hole.

[0043] In combination with the second aspect of the present application, in an optional embodiment, a partial area of ​​the inner wall of the heat dissipation through-hole extends toward its center line to form an air collecting block and a sixth through-hole. On the air inlet side of the heat dissipation through-hole, a step is formed between the surface of the air collecting block and the inner wall of the heat dissipation through-hole. The air flow can flow from the heat dissipation through-hole through the surface of the air collecting block and then through the sixth through-hole to the motor.

[0044] In conjunction with the second aspect of the present application, in an optional implementation manner, the ratio of the flow area of ​​the sixth through hole to the flow area of ​​the heat dissipation through hole is 0.4-0.75.

[0045] The present invention provides a motor for an automotive condenser. The motor has a ventilation hole on its bracket, and a moisture absorbent member is disposed within the ventilation hole. When a temperature difference between the inside and outside of the cavity creates a pressure difference, moisture vapor inside the cavity follows the airflow and flows out through the ventilation hole. The moisture absorbent member absorbs the moisture, effectively maintaining a dry environment inside the cavity, ensuring the normal operation of the motor and improving its operational stability. Furthermore, the moisture absorbent member blocks dust and moisture from outside the cavity, preventing damage to the circuit board within the cavity.

[0046] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0048] FIG1 is an exploded view of a portion of the structure of a motor for an automobile condenser provided in an embodiment of the present application and an enlarged view of the vent hole;

[0049] FIG2 is a schematic diagram of a planar structure of a motor for an automobile condenser provided in an embodiment of the present application;

[0050] FIG3 is a cross-sectional view of the section AA in FIG2 ;

[0051] FIG4 is an enlarged view of point C in FIG3 ;

[0052] FIG5 is a schematic structural diagram of a column in a motor for an automobile condenser provided in an embodiment of the present application;

[0053] FIG6 is a schematic internal perspective view of a rotor-stator assembly in a motor for an automobile condenser according to an embodiment of the present application;

[0054] FIG7 is a structural diagram of a stator mounting frame and a stator core in a motor for an automobile condenser provided in an embodiment of the present application;

[0055] FIG8 is a cross-sectional view at BB in FIG2 ;

[0056] FIG9 is an enlarged view of point D in FIG8 ;

[0057] FIG10 is a partial structural diagram of a bracket and a rear cover of a motor for an automobile condenser provided in an embodiment of the present application;

[0058] FIG11 is a schematic diagram of airflow passing through a condenser, fan blades, and a motor in a fan device for an automobile condenser provided in an embodiment of the present application.

[0059] FIG12 is a schematic structural diagram of a fan blade in a fan device for an automobile condenser provided in an embodiment of the present application;

[0060] FIG13 is an enlarged view of point A in FIG12;

[0061] FIG14 is a schematic diagram showing the positional relationship between a motor housing (rotor housing) and some heat dissipation holes in a fan device for an automobile condenser provided by an embodiment of the present application;

[0062] FIG15 is a schematic diagram of a partial structure of a motor in a fan device for an automobile condenser provided in an embodiment of the present application;

[0063] FIG16 is a perspective schematic diagram of a fan blade mounting portion of a fan device for an automobile condenser provided in an embodiment of the present application, and an enlarged view of a portion of heat dissipation holes and an air collecting block;

[0064] FIG17 is a schematic structural diagram of a heat dissipation through hole, an air collecting block, and an air dissipating block in a fan device for an automobile condenser provided in an embodiment of the present application;

[0065] FIG18 is a partial structural schematic diagram of a mounting portion of a fan blade in a fan device for an automobile condenser provided in an embodiment of the present application.

[0066] Reference Signs: 100, motor; 10, circuit board; 20, rotor-stator assembly; 211, stator core; 2111, hollow area; 212, stator winding; 213, stator mounting bracket; 214, groove; 221, rotor housing; 2211, fifth through-hole; 2212, housing inner wall; 2213, housing outer wall; 2214, housing shell; 222, magnet; 231, output shaft; 232, first bearing; 233, second bearing; 234, first retaining spring; 235, wave washer; 30, bracket; 3a, bearing cavity; 310, vent hole; 311, first through-hole; 312, second through-hole; 320, rivet block; 34, cavity; 40, rear cover; 410, rivet groove; 411, recessed rib; 510, water absorber; 520, column; 521, third through-hole. 600, fan blade; 610, blade; 620, mounting portion; 621, heat dissipation through-hole; 6211, first inner wall; 6212, second inner wall; 62a, arc through-hole; 62b, edge through-hole; 622, air collector; 623, air distributor; 624, sixth through-hole; 6251, first closed reinforcing rib; 6252, second closed reinforcing rib; 626, fourth through-hole. DETAILED DESCRIPTION

[0067] The exemplary embodiments disclosed herein will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the specific embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0068] In the following description, numerous specific details are provided to provide a more thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present application; that is, all features of actual embodiments are not described herein, nor are well-known functions and structures described in detail.

[0069] In the drawings, the sizes of layers, regions, elements and their relative sizes may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0070] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there may be no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer, or part discussed below may be represented as a second element, component, region, layer, or part. And when the second element, component, region, layer, or part is discussed, it does not necessarily mean that the first element, component, region, layer, or part is present in the present application.

[0071] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present application. When used herein, the singular forms "a", "an", and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0072] In order to fully understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other implementation methods.

[0073] An embodiment of the present application provides a motor for an automotive condenser. This motor 100 features a vent hole 310 on a bracket 30 and a water-absorbing member 510 installed within the vent hole 310, transforming the cavity 34 from a closed structure to a breathable structure. The water-absorbing member 510 promptly absorbs moisture from the cavity 34, ensuring dryness within the cavity 34 and, in turn, maintaining the operational stability of the circuit board 10. The breathable cavity 34 also allows the motor 100 to adjust the pressure balance between the interior and exterior of the cavity 34 during operation.

[0074] The following describes in detail a motor for an automobile condenser provided by the present application with reference to the accompanying drawings.

[0075] Specifically, as shown in FIG1 , an embodiment of the present application provides a motor for an automobile condenser, wherein the motor 100 includes a circuit board 10 , a bracket 30 , a rotor-stator assembly 20 , a rear cover 40 , and a ventilation assembly.

[0076] The bracket 30 is connected to the circuit board 10 , and a vent hole 310 is provided on the bracket 30 .

[0077] The stator-rotor assembly 20 includes a stator assembly and a rotor assembly. The rotor assembly surrounds the outer periphery of the stator assembly. The stator assembly is connected to the bracket 30 . The stator-rotor assembly 20 is electrically connected to the circuit board 10 .

[0078] The back cover 40 is sealedly connected to the bracket 30 . The bracket 30 is located between the back cover 40 and the rotor-stator assembly 20 . A cavity 34 is formed between the back cover 40 and the bracket 30 . The circuit board 10 is located in the cavity 34 .

[0079] The ventilation component includes a water absorbent 510 , which is located in the ventilation hole 310 . The ventilation hole 310 is connected to the cavity 34 . Condensed water vapor formed in the cavity 34 is absorbed by the water absorbent 510 when flowing through the ventilation hole 310 .

[0080] In the embodiment of the present application, a vent hole 310 is provided on the bracket 30. This vent hole 310 communicates with the cavity 34, transforming the sealed cavity 34 into a breathable one. This breathable cavity 34 can balance the internal and external pressure differences generated during motor operation. Furthermore, due to the temperature difference between the inside and outside, suspended water vapor forms within the cavity 34. With the original sealed structure, this water vapor cannot be discharged, and could adhere to the circuit board, posing a short circuit risk. The inventive breathable structure of the present application utilizes the fluidity of the airflow to remove the water vapor. Furthermore, the water-absorbing element, while being breathable, effectively absorbs the water vapor, maintaining the dryness of the airflow, effectively addressing the drawbacks of the prior art.

[0081] In addition, when the moisture outside the cavity 34 is high, the water absorbent 510 can also prevent the moisture outside the cavity 34 from entering the cavity 34 and can effectively block dust.

[0082] The motor further includes a wiring harness assembly (not shown in the figures), one end of which is located in the cavity 34 and connected to the circuit board 10 .

[0083] In an optional embodiment, as shown in Figures 2 to 4, the air vent 310 includes a first through hole 311 and a second through hole 312 that are connected to each other. One end of the first through hole 311 is connected to the second through hole 312, and the other end is connected to the cavity 34. The diameter of the first through hole 311 is larger than the diameter of the second through hole 312.

[0084] In other words, the air vent 310 is formed with a first through hole 311 and a second through hole 312 of different diameters. The distal end of the first through hole 311 connects to the interior of the cavity 34, while the distal end of the second through hole 312 connects to the exterior of the cavity 34. The larger diameter of the first through hole 311 than the second through hole 312 accelerates the flow of air from the cavity 34 from the first through hole 311 to the second through hole 312, allowing moisture within the cavity 34 to be more easily removed and fully absorbed by the water absorbent member 510.

[0085] In addition, the diameter of the second through hole 312 is smaller than that of the first through hole 311. Such a "large inside and small outside" structure can ensure internal and external airflow when the motor is in a non-working state such as transportation, and the small external diameter design can reduce the flow efficiency, further allowing the water absorbent part 510 to fully absorb the water vapor flowing through.

[0086] In an optional embodiment, the ratio of the diameter of the second through hole 312 to the diameter of the first through hole 311 is in a range of 0.37 to 0.43.

[0087] When the ratio of the diameter of the second through hole 312 to the diameter of the first through hole 311 is greater than 0.43, the ability of the water absorber 510 to block moisture outside the cavity 34 becomes weak, and moisture outside the cavity 34 may enter the cavity 34 .

[0088] When the ratio of the diameter of the second through hole 312 to the diameter of the first through hole 311 is less than 0.37, although the second through hole 312 with an excessively small diameter can effectively block the moisture outside the cavity 34, it greatly reduces the flow efficiency of the airflow inside and outside the cavity 34 and does not utilize the discharge of water vapor inside the cavity 34.

[0089] The ratio of the diameter of the second through hole 312 to the diameter of the first through hole 311 is in the range of 0.37 to 0.43, which can ensure the efficiency of airflow inside and outside the cavity 34 and effectively block moisture outside the cavity 34. As an example, the diameter of the first through hole is 10 mm and the diameter of the second through hole is 4 mm.

[0090] In an alternative embodiment, the water absorbing member 510 is located within the first through hole 311. The diameter of the first through hole 311 is larger than the diameter of the second through hole 312. Placing the water absorbing member 510 within the first through hole 311 can increase the contact area between the water absorbing member 510 and the interior of the cavity 34, thereby improving the water absorption effect of the water absorbing member 510.

[0091] In an optional embodiment, the breathable component further includes a locking member, the locking member abuts against the inner wall of the first through hole 311 , and the water absorbing member 510 is located between the locking member and the bottom wall of the first through hole 311 .

[0092] In the embodiment of the present application, a locking member is used to abut against the inner wall of the first through hole 311 to prevent the water absorbing member 510 from detaching from the first through hole 311, thereby ensuring the stability of the breathable component, thereby effectively ensuring the water absorption effect and further ensuring a dry environment inside the cavity 34.

[0093] In an optional embodiment, as shown in Figures 3 and 4, the water absorbing member 510 is located on the bottom wall of the first through hole 311, the locking member covers the surface of the water absorbing member 510, and the shape of the water absorbing member 510 matches the shape of the bottom wall of the first through hole 311.

[0094] In other words, the locking member not only abuts the inner wall of the first through-hole 311 but also covers the surface of the water-absorbing member 510, thereby limiting the position of the water-absorbing member 510 within the first through-hole 311 and preventing it from moving during motor operation, which could affect the water absorption effect. Furthermore, the shape of the water-absorbing member 510 matches the shape of the bottom wall of the first through-hole 311. Specifically, the water-absorbing member 510 is cylindrical, and its outer diameter equals the inner diameter of the first through-hole 311. This means that the water-absorbing member 510 is positioned within the first through-hole 311 with its largest area.

[0095] In an alternative embodiment, the edge of the water-absorbing member 50 extends toward the cavity to form a flange (not shown in the figure), and the flange is located on the inner wall of the first through hole 311. The flange is located between the locking member and the bottom wall of the first through hole 311. This can increase the contact area between the water-absorbing member and the cavity and improve the water absorption effect.

[0096] The thickness of the water absorbing member 510 can be set according to specific circumstances, such as according to factors such as the size of the motor, and is not limited in the embodiment of the present application.

[0097] The water absorbing member 510 is preferably wool felt, in which the wool has a tubular structure that can absorb moisture in the humid air. Of course, the material of the water absorbing member 510 is not limited to wool felt, and can also be other materials.

[0098] In an optional embodiment, as shown in Figure 5, the locking member is a cylinder 520, the outer diameter of the cylinder 520 is larger than the inner wall diameter of the first through hole 311, the cylinder 520 and the first through hole 311 are interference fit, and a third through hole 521 is provided on the cylinder 520, and the third through hole 521 corresponds to the second through hole 312.

[0099] That is, the column 520 and the first through hole 311 are in interference fit, so that the column 520 can be firmly connected to the first through hole 311. The third through hole 521 corresponds to the second through hole 312, so that the third through hole 521 and the second through hole 312 can form an air flow channel.

[0100] In an optional embodiment, as shown in FIG. 4 , the diameter of the third through hole 521 is greater than or equal to the diameter of the second through hole 312 .

[0101] In the embodiment of the present application, the diameter of the third through hole 521 is greater than or equal to the diameter of the second through hole 312. On the one hand, this can prevent the column 520 from affecting the airflow; on the other hand, the larger the diameter of the third through hole 521, the larger the contact area between the water absorbent member 510 and the cavity 34, thereby improving the water absorption effect of the water absorbent member 510.

[0102] In an alternative embodiment, the locking member is a second clip, which is clipped onto the inner wall of the first through hole 311. Compared to the column 520, the second clip occupies less space, which increases the contact area between the water absorbing member 510 and the interior of the cavity 34, thereby improving the water absorption effect of the water absorbing member 510.

[0103] In an optional embodiment, as shown in Figure 3, the rotor assembly includes a rotor housing 221, and there is a gap between the end of the rotor housing 221 and the bracket 30. The position of the corresponding air vent 310 on the rotor assembly is close to the outer wall of the rotor housing 221, and the air vent 310 is connected to the gap.

[0104] As shown in FIG3 , the opening of the air vent 310 faces the stator assembly 20 and is radially located inside the rotor housing 221 and close to the outer wall of the rotor housing 221. A fan is connected to the end of the motor away from the bracket 30. The direction of the airflow generated by the fan's rotation is as indicated by the arrow in FIG3 , that is, along the stator axis. When the airflow inside the rotor housing 211 flows to the bracket 30, it flows toward the gap. During this process, the cooling airflow can enter the cavity 34 through the air vent 31, forming a circulating airflow within the cavity 34 to remove moisture within the cavity 34. It is also worth noting that when the airflow from the periphery of the rotor housing 221 flows to the gap, it can guide the airflow out of the air vent 310, making the airflow out of the cavity 34 directional, accelerating the outflow of the airflow from the cavity 34, and preventing backflow into the cavity 34 or the interior of the rotor housing 221. This also prevents excessive moisture outside the cavity 34 from affecting the stator and rotor assemblies.

[0105] In an optional embodiment, as shown in Figures 6 and 7, the stator assembly includes a stator mounting frame 213, a stator core 211, and a stator winding 212. The stator winding 212 is wound around the stator core 211. The stator core 211 is connected to the stator mounting frame 213, which is connected to the bracket 30. The stator core 211 has a hollow area 2111 at its center. The stator mounting frame 213 is connected to the hollow area 2111 and extends from the inner wall of the hollow area 2111 toward the center of the stator core 211. At least two stator mounting frames 213 are spaced apart. The number of stator mounting frames 213 is determined based on the size of the motor and is not limited in this embodiment.

[0106] There is a hollow area 2111 between adjacent stator mounting frames 213. The hollow area 2111 can meet the lightweight requirement while also reducing wind resistance, improving heat dissipation and saving production materials.

[0107] As shown in Figures 8 and 9, the rotor-stator assembly 20 further includes a connecting assembly, which includes a first bearing 232, a second bearing 233, and an output shaft 231. The first bearing 232 and the second bearing 233 are both mounted on the output shaft 231. The bracket 30 extends to form a bearing cavity 3a. The first bearing 232 and the second bearing 233 are connected to the inner wall of the bearing cavity 3a. The first bearing 232, the second bearing 233, and the output shaft 231 are coaxial. The bracket 30 extends to form the bearing cavity 3a to ensure the structural strength of the motor and further ensure the stability of the motor operation.

[0108] The rotor assembly includes a magnet 222 , which is connected to the inner wall of the rotor housing 221 . The rotor housing 221 is connected to the output shaft 231 . The rotor housing 221 and the magnet 222 rotate along with the output shaft 231 .

[0109] The motor 100 provided in the embodiment of the present application is an external rotor motor, and the stator winding 212 is also an electromagnetic coil. An alternating current is passed through each stator winding 212. The magnet 222 is a permanent magnet, and an interaction force is generated between the magnet 222 and the stator winding 212. When an alternating current is passed through the stator winding 212, a rotating magnetic field is generated within the stator assembly. This magnetic field generates an interaction force with the magnet 222, causing the magnet 222 and the rotor housing 221 to rotate. Since the current on the stator assembly is alternating current, the magnetic field of the stator winding 212 will continuously change, thereby causing the interaction force on the rotor assembly to continuously change, thereby causing the rotor assembly to continue to rotate.

[0110] In an optional embodiment, as shown in FIG9 , the first bearing 232 is located at one end of the bearing cavity 3 a close to the circuit board 10 , and the first bearing 232 is in transition fit with the output shaft 231 and in interference fit with the bearing cavity 3 a .

[0111] The second bearing 233 is located at one end of the bearing cavity 3 a away from the circuit board 10 . The second bearing 233 is in interference fit with the output shaft 231 and in transition fit with the bearing cavity 3 a .

[0112] The interference fit can ensure the concentricity of the second bearing 233 relative to the output shaft 231 , thereby ensuring the concentricity between the first bearing 232 and the second bearing 233 , and further ensuring the smooth rotation of the rotor assembly.

[0113] In an optional embodiment, the side wall of the bearing cavity 3a is made of metal. The side wall of the bearing cavity 3a is formed by metal manufacturing and enclosing. During the tight fit or interference fit process, the deformation of the bearing cavity 3a is greatly reduced, further ensuring the concentricity of the first bearing and the second bearing relative to the output shaft.

[0114] In an optional embodiment, as shown in FIG7 , the stator assembly further includes a stator pole shoe connected to the ends of the stator teeth of the stator core 211 , and a symmetrical groove 214 is provided on a side of the stator pole shoe close to the rotor assembly.

[0115] The symmetrical grooves 214 provided on the stator pole shoes can optimize the cogging torque and thus improve noise and vibration.

[0116] In an optional embodiment, the connection assembly further includes a limiting member, which is clamped between the first bearing 232 and the output shaft 231, and / or between the second bearing 233 and the inner wall of the bearing cavity 3a.

[0117] The positions of the first bearing 232 and the second bearing 233 are limited by a limiting member to prevent axial transmission.

[0118] Furthermore, the limiting member is a first retaining spring 234 and / or a wave washer 235. The first retaining spring 234 and the wave washer 235 both have a good clamping effect, and can prevent the first bearing 232 and the second bearing 233 from axial transmission.

[0119] In an optional embodiment, as shown in Figures 1 and 10, a plurality of rivet blocks 320 are provided on the side wall of the bracket 30, and a plurality of rivet grooves 410 are formed outwardly on the edge of the back cover 40. The rivet grooves 410 cover the rivet blocks 320, and the rivet grooves 410 have recessed ribs 411. The recessed ribs 411 abut against the surface of the side wall of the bracket 30, so that the back cover 40 is fixedly connected to the bracket 30.

[0120] In the embodiment of the present application, the back cover 40 and the bracket 30 are firmly connected by the recessed ribs 411 on the rivet groove 410, thereby ensuring the connection stability between the back cover 40 and the bracket 30. There is no need to introduce screws for locking, which reduces the locking process and can greatly reduce the risk of tripping in a vibration environment.

[0121] In an optional embodiment, the back cover 40 is made of metal, and a recessed rib 411 is formed on the rivet groove 410 by a riveting process.

[0122] Based on the fluidity of the metal itself, a press riveting process is used to form a recessed rib 411 on the rivet groove 410 to achieve a fixed connection between the back cover 40 and the bracket 30. This method is easy to operate, simple in process and highly efficient.

[0123] It can be understood that during the riveting process, the contact area between the riveting equipment and the rivet groove 410 is small, which can avoid stress concentration, ensure the stability of the shape of the rivet groove 410 before and after riveting, and further ensure the effectiveness of riveting.

[0124] In the embodiment of the present application, the back cover 40 is first placed on the bracket 30, and the rivet block 320 is inserted into the rivet groove 410, and then the side walls of the rivet groove 410 are respectively applied with riveting pressure toward the rivet block 320, and then the metal fluidity is used to make the rivet block 320 and the rivet groove 410 riveted together and fixed.

[0125] It should be noted that after the rivet block 320 is inserted into the rivet groove 410 , there may be a gap between the back cover 40 and the bracket 30 , or they may abut against each other.

[0126] In an optional embodiment, the riveting process adopts point pressing, which can further avoid concentrated force and ensure the stability of the shape of the rivet groove 410 before and after the riveting.

[0127] In a preferred embodiment, the back cover 40 is made of aluminum, which has better fluidity and improves the connection strength between the back cover 40 and the bracket 30 .

[0128] In the prior art, the radial dimensions of mounting portion 620 are larger than those of the motor housing, and mounting portion 620 is designed as a solid structure to ensure structural strength. When the condenser fan is in operation, airflow flows approximately along the axial direction of the condenser motor, dissipating heat only from the exterior of motor 100 and its housing. Essentially no cooling airflow flows into the interior of the motor, resulting in poor heat dissipation from the condenser motor 100.

[0129] Based on the above technical problems, an embodiment of the present application provides a fan device for a car condenser, which is provided with a plurality of heat dissipation holes 621 on the mounting portion 620 of the fan blade 600. When the condenser fan is in working state, the wind flows through the plurality of heat dissipation holes 621 and directly acts on the outer casing of the motor 100 and flows through the interior of the motor 100, thereby greatly improving the heat dissipation effect of the motor 100.

[0130] Specifically, as shown in Figures 11 and 12, an embodiment of the present application provides a fan device for an automotive condenser. The fan device includes a motor 100 provided in any of the above-described embodiments; and further includes a fan blade 600. The fan blade 600 includes a mounting portion 620 and a plurality of blades 610 surrounding and connected to the mounting portion 620. The mounting portion 620 corresponds to the motor 100 and is provided with a plurality of heat dissipation holes 621. The rotor-stator assembly 20 has a first end and a second end disposed opposite each other along its axial direction. The rotor-stator assembly 20 has an air inlet facing the first end of the fan blade 600, and a gap is formed between the second end facing the bracket 30 and the bracket 30. A first airflow flowing from the blade 610 toward the motor acts on the periphery of the rotor-stator assembly. A second airflow flowing from the heat dissipation holes 621 toward the motor 100 at least partially enters the interior of the motor 100 through the air inlet, flows out through the gap, and then merges with the first airflow.

[0131] In an optional embodiment, the orthographic projection of the rotor housing of the stator-rotor assembly in the first plane perpendicular to the rotation axis of the motor is located outside the orthographic projection of the blade in the first plane, and the orthographic projection of the rotor housing of the stator-rotor assembly in the first plane perpendicular to the rotation axis of the motor at least partially overlaps with the orthographic projection of the heat dissipation through hole in the first plane.

[0132] As shown in Figure 11, Figure 11 is a schematic diagram of the direction of airflow in the condenser, the fan blades 600 of the fan device and the motor 100 in the embodiment of the present application. The fan blades 600 in the fan device provided in the embodiment of the present application play a flow-aiding role in the airflow flowing from the front of the vehicle through the condenser in the form of exhaust under the driving force of the motor 100. The airflow flowing through the condenser flows to the motor 100 through the blades 610 of the fan blades 600 and the multiple heat dissipation holes 621 on the mounting portion 620. The airflow can directly act on the outer casing of the motor 100 and flow through the interior of the motor 100 from the heat dissipation holes 621, thereby improving the heat dissipation effect of the motor 100. In addition, the heat dissipation holes 621 and the airflow channel formed in the motor 100 increase air fluidity, further improving the heat dissipation efficiency of the condenser.

[0133] In addition, as shown in Figure 11, the motor 100 includes a rotor housing 221 and a bracket 30. There is a gap between the rotor housing 221 of the motor 100 and the bracket 30. The rotor housing 221 is provided with an air inlet at the first end facing the fan blade. The first airflow flowing from the blade 610 to the motor 100 acts on the periphery of the rotor housing 221, and the second airflow flowing from the heat dissipation through-hole 621 to the motor 100 at least partially enters the interior of the motor 100 and flows out at the gap. When the airflow inside the motor is accelerated, it can better flow out from the gap between the rotor housing 221 and the bracket 30 and merge with the first airflow outside the rotor housing 221. Not only will the phenomenon of airflow backflow not be formed, but the air fluidity can also be increased and the airflow rate can be accelerated.

[0134] It should be noted that the number of heat dissipation holes 621 provided on the mounting portion 620 is set according to the size of the fan blades and is not limited in this embodiment of the present application.

[0135] In one embodiment, as shown in Figure 12, a fourth through hole 626 for connecting the output shaft 231 is provided on the mounting portion 620, the axis of the mounting portion 620 is arranged colinearly with the axis of the output shaft 231 and rotates synchronously, and a plurality of heat dissipation through holes 621 are distributed on the mounting portion 620 with the fourth through hole 626 as the center.

[0136] That is to say, the output shaft 231 on the motor 100 is connected to the fourth through hole 626 of the mounting part 620, and the fan blade 600 rotates under the drive of the motor 100. Multiple heat dissipation holes 621 are distributed with the fourth through hole 626 as the center, thereby improving the force uniformity of the mounting part 620.

[0137] Preferably, multiple heat dissipation holes 621 are evenly distributed on the mounting portion 620 with the fourth hole 626 as the center. The even distribution of multiple heat dissipation holes 621 further improves the force uniformity of the mounting portion 620 and the entire fan blade 600, ensuring the working stability of the fan device.

[0138] In one embodiment, as shown in FIG. 13 and FIG. 14 , the heat dissipation through hole 621 includes an arc-shaped through hole 62 a , and the arc-shaped through hole 62 a corresponds to the side wall of the housing of the motor 100 .

[0139] That is, the airflow flows through the arc through hole 62 a and directly flows to the side wall of the housing of the motor 100 , so as to directly dissipate heat from the side wall of the housing of the motor 100 and improve the heat dissipation effect of the motor 100 .

[0140] Further, as shown in Figures 13 and 14, the outer casing of the motor 100 is the rotor casing 221. Along the radial direction of the fan blade 600, the first inner wall 6211 of the arc through hole 62a is located on the outside of its second inner wall 6212. The first inner wall 6211 and the second inner wall 6212 of the arc through hole 62a correspond to the outer casing wall 2213 and the casing shell 2214 of the motor 100. The second inner wall 6212 of the arc through hole 62a is located on the outside of the inner casing wall 2212 of the motor 100.

[0141] That is, after the airflow passes through the arc-shaped through-hole 62a, a portion of the airflow flows directly toward the outer housing wall 2213 of the motor 100, while another portion of the airflow directly acts on the housing shell 2214, that is, the chamfered corner of the rotor housing 221, and flows toward the outer housing wall 2213 under the obstruction of the housing shell 2214. The airflow passing through the arc-shaped through-hole 62a directly dissipates heat from the outer housing wall 2213 and the housing shell 2214, thereby improving the heat dissipation effect.

[0142] It is understood that the edge shape of the orthographic projection of the rotor housing 221 of the motor 100 on the mounting portion 620 corresponds to the shape of the arc-shaped through-hole 62a. As an example, the rotor housing 221 of the motor 100 is a cylindrical structure, and its orthographic projection on the mounting portion 620 is an arc, and the shape of the arc-shaped through-hole 62a corresponds to the arc.

[0143] It can also be understood that the edge shape of the rotor housing 221 of the motor 100 projected on the mounting portion 620 is a closed arc, and the arc through hole 62a is composed of multiple independent arcs, which correspond to partial areas of the closed arc.

[0144] In one embodiment, as shown in Figure 13, the two ends of the arc through hole 62a extend to form edge through holes 62b, and the edge through holes 62b correspond to the air inlet on the rotor housing 221 of the motor 100. The air inlet includes at least a fifth through hole 2211, and the fifth through hole 2211 is a heat dissipation hole on the motor 100.

[0145] That is to say, the edge through hole 62b is connected to the arc through hole 62a, and the edge through hole 62b corresponds to the fifth through hole 2211. The airflow enters from the edge through hole 62b, flows through the fifth through hole 2211 and enters the interior of the motor 100, increasing the fluidity of the airflow and thereby improving the heat dissipation effect of the motor 100.

[0146] Furthermore, the arc through hole 62a and the edge through hole 62b form a first angle, which is an acute angle, so that the edge through hole 62b can correspond to the interior of the motor 100. The combination of the arc through hole 62a and the edge through hole 62b greatly increases the fluidity of the airflow, further improving the heat dissipation effect on the condenser.

[0147] The size of the first angle can be set according to the position of the fifth through hole 2211 on the rotor housing 221 of the motor 100, and is not limited in this embodiment of the present application.

[0148] In one embodiment, as shown in Figures 6, 7, and 15, the hollowed-out area 2111 in the center of the stator core 211 extends between adjacent stator mounting frames 213. Specifically, the space formed between the stator core 211, the stator mounting frames 213, and the outer wall of the bearing cavity 3a corresponds to the fifth through-hole 2211. Thus, the edge through-hole 62b, the fifth through-hole 2211, and this space form an airflow channel, increasing the speed of airflow through the fan assembly, further improving the heat dissipation efficiency of the motor 100, and even further improving the heat dissipation efficiency of the condenser.

[0149] In one embodiment, as shown in Figure 16, a partial area of ​​the inner wall of the heat dissipation through hole 621 extends toward its center line to form an air collecting block 622 and a sixth through hole 624. On the air inlet side of the heat dissipation through hole 621, a step is formed between the surface of the air collecting block 622 and the inner wall of the heat dissipation through hole 621. The air flow can flow from the heat dissipation through hole 621 through the surface of the air collecting block 622 and then through the sixth through hole 624 to flow to the motor 100.

[0150] That is, when the airflow flows through the heat dissipation through-hole 621 , part of the airflow flows directly to the motor 100 through the sixth through-hole 624 , and the other part of the airflow flows to the sixth through-hole 624 after being blocked by the air collecting block 622 .

[0151] In an optional embodiment, the ratio of the flow area of ​​the sixth through hole 624 to the flow area of ​​the heat dissipation through hole is 0.4-0.75.

[0152] The purpose of the above-mentioned setting method is to accelerate the airflow flowing through the sixth through hole 624, so that the flow rate of the second airflow entering the interior of the motor 100 at the gap is still greater than the first airflow at the periphery, thereby preventing backflow and avoiding trapping hot air inside the motor 100 casing.

[0153] It is understood that on the air inlet side, the air collecting block 622 forms a groove at the heat dissipation through-hole 621, and the air flow can flow into the groove, that is, the surface of the air collecting block 622, and then flow into the sixth through-hole 624 from the surface of the air collecting block 622. Due to the presence of the air collecting block 622, the air inlet side area of ​​the air flow is larger than the cross-sectional area of ​​the sixth through-hole 624, which can accelerate the air flow passing through the sixth through-hole 624, further improving the heat dissipation efficiency of the motor 100. It is also worth noting that after the air flow is accelerated by the air collecting block 622, it enters the interior of the motor 100, dissipates heat from the interior of the motor 100, and then flows out from the above-mentioned gap. At this time, the flow rate of the air flow flowing out of the gap is greater than the flow rate of the air flow acting on the outside of the motor 100 by the fan blades 600, so it can flow out smoothly without causing backflow. Similarly, the air flow at the arc through-hole 62a will also be accelerated, and the flow rate of the air flow acting on the outer shell of the motor 100 is also greater than the flow rate of the air flow acting on the outside of the motor 100 by the fan blades 600. Furthermore, an air collecting block 622 is formed extending from the inner wall of one side of the heat dissipation through hole 621. As shown in Figure 16, the air collecting block 622 extends from the inner wall of one side of the heat dissipation through hole 621. When the diameter of the sixth through hole 624 is small, extending the air collecting block 622 from the inner wall of one side of the heat dissipation through hole 621 can meet the airflow rate requirement.

[0154] However, when the diameter of the sixth through hole 624 is large, the air collecting block 622 extending from the inner wall of one side of the heat dissipation through hole 621 cannot meet the airflow velocity. Alternatively, two air collecting blocks 622 are formed extending from the inner walls of the heat dissipation through hole 621 on both sides, with the sixth through hole 624 located between the two air collecting blocks 622.

[0155] It should be noted that the thickness of the air collecting block 622 is relatively thinner than that of the mounting portion 620. When the area of ​​the air collecting block 622 is large, the pressure caused by the rapidly passing airflow makes the air collecting block 622 unstable. Therefore, extending from the inside of both sides of the heat dissipation hole 621 at the same time can reduce the area of ​​a single air collecting block 622 and ensure the structural stability of the air collecting block 622.

[0156] In one embodiment, as shown in Figures 16 and 17 , a portion of the inner wall of the other side, opposite the inner wall of the heat dissipation through-hole 621 from which the air collecting block 622 extends, extends toward the centerline of the heat dissipation through-hole 621 to form an air dispersion block 623. On the outlet side of the heat dissipation through-hole 621, a step is formed between the surface of the air dispersion block 623 and the inner wall of the heat dissipation through-hole 621. Airflow exiting from the sixth through-hole 624 can flow toward the motor 100 via the surface of the air dispersion block 623. The air dispersion block 623 reduces obstruction to the airflow after passing through the sixth through-hole 624 by increasing its area, and can also serve to converge the airflow toward the axis of the motor 100, thereby allowing the airflow to better enter the interior of the motor 100 through the fifth through-hole 2211.

[0157] In the embodiment of the present application, the direction of the arrow s in FIG. 17 indicates the direction of the airflow, that is, the airflow flows from the air inlet side of the fan blade 600 through the sixth through hole 624 to the motor 100. When the air inlet side area of ​​the heat dissipation through hole 621 is larger than the cross-sectional area of ​​the sixth through hole 624, the rate at which the airflow enters the sixth through hole 624 can be increased. At the same time, when the air outlet side area of ​​the heat dissipation through hole 621 is also larger than the cross-sectional area of ​​the sixth through hole 624, the efficiency of the airflow out of the sixth through hole 624 can be increased, further increasing the rate at which the airflow flows to the motor 100.

[0158] In one embodiment, as shown in FIG. 13 , both ends of the arc through hole 62 a extend along a curve to form edge through holes 62 b .

[0159] In this embodiment, as air flows through edge through-hole 62b, it exerts pressure on the periphery of edge through-hole 62b. The ends of arc-shaped through-hole 62a extend along a curve to form curved edge through-hole 62b. Curved edge through-hole 62b, or non-linear edge through-hole 62b, allows for multiple points of force to be applied during airflow, avoiding concentrated force. This ensures the structural stability of mounting portion 620 and further ensures the rotational stability of fan blade 600.

[0160] The specific shape of the edge through hole 62b is not limited in the embodiment of the present application and can be set according to specific needs.

[0161] In addition, the shape of the arc through hole 62a can be selected as the arc mentioned above, which can match the outer wall shape of the rotor housing 221 of the motor 100 on the one hand, and avoid concentrated force when the airflow flows through the arc through hole 62a on the other hand.

[0162] In one embodiment, as shown in FIG18 , the mounting portion 620 is provided with reinforcing ribs, which include first closed reinforcing ribs 6251 . The first closed reinforcing ribs 6251 form a closed loop structure, and the ends of the edge through holes 62 b are connected to the first closed reinforcing ribs 6251 .

[0163] The first closed reinforcing rib 6251 can not only strengthen the support for the area formed by the heat dissipation through hole 621 and the mounting portion 620 , but also strengthen the support for the entire mounting portion 620 , thereby ensuring the structural strength of the mounting portion 620 .

[0164] In one embodiment, as shown in FIG18 , the reinforcing rib further includes a second closed reinforcing rib 6252 . In the radial direction of the fan blade 600 , the second closed reinforcing rib 6252 is located on the inner side of the first closed reinforcing rib 6251 , and the second closed reinforcing rib 6252 forms a closed loop structure.

[0165] The combination of the second closed reinforcing rib 6252 and the first closed reinforcing rib 6251 ensures the structural strength of the entire fan blade 600, and further ensures the working stability of the fan device.

[0166] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the claims. Various modifications and variations may be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form additional embodiments of the present application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of the present application and do not limit the scope of protection of the patent application.

Claims

1. A motor for an automotive condenser, characterized in that, Comprising: A circuit board (10); A bracket (30) connected to the circuit board (10), with ventilation holes (310) provided on the bracket (30); A rotor-stator assembly (20) electrically connected to the circuit board (10), the rotor-stator assembly (20) comprising a stator assembly and a rotor assembly, and the rotor assembly surrounding the periphery of the stator assembly; A rear cover (40) hermetically connected to the bracket (30), the bracket (30) being located between the rear cover (40) and the rotor-stator assembly (20), a cavity (34) being formed between the rear cover (40) and the bracket (30), and the circuit board (10) being located within the cavity (34); A ventilation component, which includes a water-absorbing member (510), the water-absorbing member (510) being located within the ventilation hole (310), the ventilation hole (310) communicating with the cavity (34), and the condensed water vapor formed within the cavity (34) being absorbed by the water-absorbing member (510) when flowing through the ventilation hole (310).

2. The motor for an automotive condenser according to claim 1, wherein The ventilation hole (310) includes a first through-hole (311) and a second through-hole (312) that are connected. One end of the first through-hole (311) is connected to the second through-hole (312), and the other end is connected to the cavity (34). The diameter of the first through-hole (311) is greater than the diameter of the second through-hole (312).

3. The motor for an automotive condenser according to claim 2, wherein The ratio range of the diameter of the second through-hole (312) to the diameter of the first through-hole (311) is 0.37 to 0.

43.

4. The motor for an automotive condenser according to claim 2, wherein The water-absorbing member (510) is located within the first through-hole (311).

5. The motor for an automotive condenser according to claim 4, wherein, The ventilation component further includes a locking member that abuts against the inner wall of the first through-hole (311), and the water-absorbing member (510) is located between the locking member and the bottom wall of the first through-hole (311).

6. The motor for an automotive condenser according to claim 5, wherein The water-absorbing member (510) is located on the bottom wall of the first through-hole (311), the locking member presses on the surface of the water-absorbing member (510), and the shape of the water-absorbing member (510) matches the shape of the bottom wall of the first through-hole (311).

7. The motor for an automotive condenser according to claim 5, characterized in that, The locking member is a cylinder (520), the outer diameter of the cylinder (520) is greater than the inner diameter of the first through-hole (311), and the cylinder (520) is in interference fit with the first through-hole (311). A third through-hole (521) is provided on the cylinder (520), and the third through-hole (521) corresponds to the second through-hole (312).

8. The motor for an automotive condenser according to claim 7, characterized in that, The diameter of the third through-hole (521) is greater than or equal to the diameter of the second through-hole (312).

9. The motor for an automotive condenser according to claim 1, wherein The rotor assembly includes a rotor housing (221), there is a gap between the end of the rotor housing (221) and the bracket (30), the position of the rotor assembly corresponding to the ventilation hole (310) is close to the outer wall of the rotor housing (221), and the ventilation hole (310) communicates with the gap.

10. The motor for an automotive condenser according to claim 9, characterized in that, The stator assembly includes a stator mounting bracket (213), a stator core (211), and a stator winding (212). The stator winding (212) is wound around the stator core (211). The stator core (211) is connected to the stator mounting bracket (213), and the stator mounting bracket (213) is connected to the bracket (30). The rotor-stator assembly (20) further includes: A connection assembly, which includes a first bearing (232), a second bearing (233), and an output shaft (231). Both the first bearing (232) and the second bearing (233) are sleeved on the output shaft (231). The bracket (30) extends to form a bearing cavity (3a). The first bearing (232) and the second bearing (233) are connected to the inner wall of the bearing cavity (3a). The first bearing (232), the second bearing (233), and the output shaft (231) are coaxial. The rotor assembly includes a magnet (222). The magnet (222) is connected to the inner wall of the rotor housing (221). The rotor housing (221) is connected to the output shaft (231). The rotor housing (221) and the magnet (222) follow The output shaft (231) to perform a rotational movement.

11. The motor for an automotive condenser according to claim 10, wherein, The first bearing (232) is located at one end of the bearing cavity (3a) close to the circuit board (10). There is an interference fit between the first bearing (232) and the output shaft (231), and an interference fit between the first bearing (232) and the bearing cavity (3a). The second bearing (233) is located at one end of the bearing cavity (3a) far from the circuit board (10). There is an interference fit between the second bearing (233) and the output shaft (231), and an interference fit between the second bearing (233) and the bearing cavity (3a).

12. The motor for an automotive condenser according to claim 10, wherein, The side wall of the bearing cavity (3a) is made of metal.

13. The motor for an automotive condenser according to claim 10, wherein The connection assembly further includes a limiting member. The limiting member is clamped between the first bearing (232) and the output shaft (231), and / or clamped between the second bearing (233) and the inner wall of the bearing cavity (3a).

14. The motor for an automotive condenser according to claim 13, characterized in that, The limiting member is a first snap ring (234) and / or a wave washer (235).

15. The motor for an automotive condenser according to claim 1, characterized in that, A plurality of riveting blocks (320) are provided on the side wall of the bracket (30). A plurality of riveting grooves (410) are formed by surrounding the edge of the rear cover (40) outward. The riveting grooves (410) are press-fitted over the riveting blocks (320). The riveting grooves (410) have recessed ribs (411). The recessed ribs (411) abut against the side wall surface of the bracket (30) so that the rear cover (40) is fixedly connected to the bracket (30).

16. The motor for an automotive condenser according to claim 15, characterized in that, The material of the rear cover (40) is metal. The recessed ribs (411) are formed on the riveting grooves (410) by a press riveting process.

17. A fan device for an automotive condenser, characterized in that, An electric motor for an automotive condenser according to any one of claims 1 to 16; further including: A fan blade (600) is connected to the output shaft (231) of the rotor-stator assembly (20). The fan blade (600) includes a mounting portion (620) and a plurality of blades (610) circumferentially connected to the mounting portion (620). The mounting portion (620) faces the motor (100), and a plurality of heat dissipation through holes (621) are provided on the mounting portion (620). The rotor-stator assembly (20) has a first end and a second end disposed opposite to each other along its axial direction. An air inlet is provided at the first end of the rotor-stator assembly (20) facing the fan blade (600), and a gap is formed between the second end facing the bracket (30) and the bracket (30). The first air flow flowing from the blade (610) to the motor (100) acts on the periphery of the rotor-stator assembly (20). The second air flow flowing from the heat dissipation through hole (621) to the motor (100) at least partially enters the interior of the motor (100) through the air inlet and flows out at the gap and then merges into the first air flow.

18. The fan device for an automotive condenser according to claim 17, characterized in that, The orthographic projection of the rotor housing (221) of the rotor-stator assembly (20) in a first plane perpendicular to the rotation axis of the motor (10) is located outside the orthographic projection of the blade (610) in the first plane. The orthographic projection of the rotor housing (221) of the rotor-stator assembly (20) in a first plane perpendicular to the rotation axis of the motor (10) at least partially overlaps with the orthographic projection of the heat dissipation through hole (621) in the first plane.

19. The fan device for an automotive condenser according to claim 17, characterized in that, A fourth through hole (626) for connecting the output shaft (231) is provided on the mounting portion (620). The axis of the mounting portion (620) is collinear with the axis of the output shaft (231) and rotates synchronously. A plurality of the heat dissipation through holes (621) are distributed on the mounting portion (620) centered on the fourth through hole (626).

20. The fan device for an automotive condenser according to claim 17, wherein, The heat dissipation through hole (621) includes an arc through hole (62a), and the arc through hole (62a) corresponds to the side wall of the rotor housing (221) of the rotor-stator assembly.

21. The fan device for an automotive condenser according to claim 20, wherein, Along the radial direction of the fan blade (600), the first inner wall (6211) of the arc through hole (62a) is located outside its second inner wall (6212). The first inner wall (6211) and the second inner wall (6212) of the arc through hole (62a) correspond to the outer side wall (2213) and the outer shell (2214) of the housing of the motor (100). The second inner wall (6212) of the arc through hole (62a) is located outside the inner side wall (2212) of the housing of the motor (100).

22. The fan device for an automotive condenser according to claim 20, characterized in that, Edge through holes (62b) are formed by extending the two ends of the arc through hole (62a), and the edge through holes (62b) correspond to the air inlet on the rotor housing (221) of the rotor-stator assembly. The air inlet at least includes a fifth through hole (2211).

23. The fan device for an automotive condenser according to claim 17, characterized in that, On a partial area of the inner wall of the heat dissipation through hole (621), a wind collecting block (622) and a sixth through hole (624) are formed by extending towards the center line direction thereof. On the air inlet side of the heat dissipation through hole (621), a step is formed between the surface of the wind collecting block (622) and the inner wall of the heat dissipation through hole (621), and air flow can flow from the heat dissipation through hole (621), through the surface of the wind collecting block (622), and then through the sixth through hole (624) to flow towards the motor (100).

24. The fan device for an automotive condenser according to claim 23, characterized in that, The ratio of the flow-through area of the sixth through hole (624) to the flow-through area of the heat dissipation through hole (621) is 0.4 - 0.75.

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