Fully-sealed motor with good heat dissipation performance

Abstract

The utility model discloses a fully-sealed motor with good heat dissipation performance, which adopts a waterproof breathable film to cover an end cover hole, so that gas can pass through and impurities such as water, dust and the like cannot pass through, gas inside and outside the motor can be exchanged and circulated while the sealing performance is ensured, and air-cooled heat dissipation inside the motor is completed. According to the design, on one hand, convection can be directly formed in the motor so that airflow can be blown to the rotor to achieve rapid heat dissipation of the rotor, on the other hand, airflow inside and outside the motor can be exchanged through the waterproof breathable film to balance internal and external air pressure, and on the other hand, the waterproof breathable film corresponding to the end cover hole can achieve air convection through the design of the end cover hole. Therefore, simple internal and external air pressure balance is not only realized, and internal and external slow air flow exchange is realized, so that the heat is brought out by the air flow to realize direct heat dissipation in the motor. The design is low in energy consumption, high in reliability, good in heat dissipation performance and long in service life, and meanwhile the manufacturing cost of the motor is not obviously increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a motor, in particular to a full-sealed motor with good heat dissipation. BACKGROUND

[0002] The electric tricycle, electric weeding machine and other equipment all adopt the motor (generally brushless motor) as the power component, and considering the bad working environment, the motor needs to be designed for waterproof and dustproof. Generally, the motor with power above 4000W is equipped with a water cooling system, and the motor with power below 4000W generally adopts the mode of leading the heat in the motor to the motor shell and then blowing the motor shell by a large fan to complete heat dissipation. This mode will cause high power consumption and affect the endurance time. These designs are all through the sealing design of the motor to realize dustproof and waterproof.

[0003] At present, most of the motors are below 4000W, so the air cooling is adopted. However, in the daily use process, if the motor is used for a long time or overloaded, the temperature in the motor will rapidly rise, and at the same time, the heat is led out by the shell, so the heat dissipation effect in the motor is very poor, and the temperature in the motor is often above 150℃, which will easily cause the demagnetization of the permanent magnet in the motor and damage the motor. According to the actual investigation, the service life of the motor of the electric tricycle and the electric weeding machine is mostly concentrated in about half a year to one year, and the reason for the short service life is basically the demagnetization caused by the insufficient heat dissipation.

[0004] Therefore, how to improve the heat dissipation performance of the motor while ensuring the waterproof and dustproof of the motor is a technical problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0005] In view of the above defects of the prior art, the technical problem to be solved by the utility model is to provide a full-sealed motor with good heat dissipation, which can improve the heat dissipation performance of the motor while realizing the waterproof and dustproof of the motor, so as to improve the service life of the motor.

[0006] In order to realize the above purpose, the utility model provides a full-sealed motor with good heat dissipation, which comprises a motor body and an output shaft, and the output shaft is installed in the motor body.

[0007] A fan cover is installed on the motor body, the inside of the fan cover is a hollow fan cavity, a fan blade and an end cover are installed in the fan cavity, the fan blade is installed on the output shaft or the motor shaft of the fan blade motor, and the output shaft or the fan blade motor drives the fan blade to rotate.

[0008] The end cover is assembled with the fan cover, a plurality of end cover holes distributed from inside to outside are arranged on the end cover, and the end cover holes are directly or indirectly sealed and closed by waterproof and breathable membranes.

[0009] As a further improvement of the utility model, a fan flange is arranged in the fan cavity, and the fan flange is assembled and fixed with the end cover.

[0010] As a further improvement of the utility model, the end cover and the waterproof and breathable part are arranged in the outer cover, the outer cover is arranged on the fan cover, and a plurality of through outer cover holes are arranged on the outer cover.

[0011] As a further improvement of the utility model, the waterproof and breathable film is sealed and pasted on the end cover, and the waterproof and breathable film seals the end cover hole.

[0012] As a further improvement of the utility model, the waterproof and breathable film is arranged on the waterproof and breathable part, and the waterproof and breathable part is arranged on the end cover or the fan cover.

[0013] As a further improvement of the utility model, a protective net is arranged at least on one end surface of the waterproof and breathable film, a plurality of through net holes are arranged on the protective net, and the protective net is assembled and fixed on the waterproof and breathable part.

[0014] As a further improvement of the utility model, the protective nets are arranged on both end surfaces of the waterproof and breathable film, the protective nets are assembled and fixed on the waterproof and breathable part and clamp the waterproof and breathable film in the middle.

[0015] As a further improvement of the utility model, the waterproof and breathable head is further provided, the waterproof and breathable film is arranged in the waterproof and breathable head, and the waterproof and breathable film divides one end of the waterproof and breathable head, which is communicated with the motor body, and one end, which is communicated with the atmosphere.

[0016] As a further improvement of the utility model, the waterproof and breathable head comprises a connector pipe, a connector seat and a connector cap, one end of the connector pipe is assembled with the connector seat, the other end is sealed and assembled into the end cover hole, the inside of the connector cap is a hollow connector cap cavity, a plurality of through connector cap holes are arranged on the outer wall of the connector cap, the connector cap holes are communicated with the connector cap cavity, the connector seat is assembled into the connector cap cavity and is assembled and fixed, a film seat is arranged in the connector cap cavity, the waterproof and breathable film is assembled and fixed on the film seat, and the waterproof and breathable film separates the communication between the connector pipe and the connector cap cavity; the connector cap is located on the side far from the fan blade.

[0017] As a further improvement of the utility model, an extrusion ring is further arranged in the fan cavity of the fan cover, an expansion ring is further arranged on the part between the extrusion ring and the fan flange, the inside of the expansion ring is a hollow expansion cavity, the inside of the expansion cavity is filled with insulating liquid, the expansion ring is made of water-swelling rubber, and the insulating liquid is a non-conductive liquid.

[0018] The expansion cavity is communicated with one end of the connecting pipe, the other end of the connecting pipe is arranged into the display shell after penetrating out of the fan cover, the inside of the display shell is a hollow display cavity, the inside of the connecting pipe is a hollow connecting pipe cavity, one end of the connecting pipe cavity arranged into the display shell is sealed by the sealing head, the sealing head is installed on the sealing piece, the sealing piece and the inner end face of the display cavity are respectively pressed or assembled with the two ends of the spring, the spring applies the elastic force to the sealing piece to push the connecting pipe cavity to keep the sealing head sealing the connecting pipe cavity;

[0019] The end cover is close to the end face of the fan blade, the inner side of the end cover hole and the outer wall of the fan flange are respectively close to the water absorption piece, the water absorption piece is made of water absorption material, and the end face of the water absorption piece is close to the expansion ring.

[0020] The utility model discloses the beneficial effects are:

[0021] The utility model discloses waterproof and breathable membrane covers end cover hole, so that gas can pass through, and water, dust and other impurities cannot pass through, which ensures the sealing performance while enabling the gas exchange and circulation inside and outside the motor, thereby completing the air cooling heat dissipation of the motor. This design can directly form convection in the motor to blow the rotor to achieve rapid heat dissipation of the rotor, on the other hand, the air flow inside and outside the motor exchanges through the waterproof and breathable membrane to balance the internal and external air pressure, and the design of the end cover hole enables the waterproof and breathable membrane corresponding to the end cover hole to realize the gas convection. This is not only a simple internal and external air pressure balance, but also a slow air flow exchange inside and outside, so that the heat is taken out by the air flow to achieve direct heat dissipation of the motor. Compared with the traditional fan blowing motor shell heat dissipation mode, the design has low energy consumption, high reliability, good heat dissipation performance and long service life, and does not significantly increase the manufacturing cost of the motor. That is to say, the performance and service life of the motor are improved without significant increase in cost, which has wide market promotion space and potential. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure schematic of example one Figure One ;

[0023] Figure 2 It is the structure schematic of example one Figure Two ;

[0024] Figure 3 It is the sectional view of example one at the center surface where the output shaft axis is located;

[0025] Figure 4 It is the part explosion drawing of example one;

[0026] Figure 5 It is the convection schematic of end cover 150 and waterproof and breathable membrane 310 in use in example one;

[0027] Figure 6is a part explosion of example two Figure One ;

[0028] Figure 7 is a part explosion of example two Figure Two ;

[0029] Figure 8 is a part explosion of example two Figure Three ;

[0030] Figure 9 is a part explosion of the waterproof and breathable piece 300 of example two Figure One ;

[0031] Figure 10 is a part explosion of the waterproof and breathable piece 300 of example two Figure Two ;

[0032] Figure 11 is a structural schematic diagram (cross-sectional view at the center plane where the axis of the end cap hole 151 is located) of example three;

[0033] Figure 12 is a structural schematic diagram of example four;

[0034] Figure 13 is Figure 12 an enlarged view at A in FIG. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Example one

[0036] Referring to Figures 1-4 , the fully-sealed motor of the embodiment comprises a motor body 110 and an output shaft 120, the output shaft is installed in the motor body 110, and the motor body 110 drives the output shaft 120 to rotate circumferentially to output power outward after being started.

[0037] The motor body 110 is further provided with a fan cover 140, the fan cover 140 is internally provided with a hollow fan cavity 141, the fan cavity 141 is provided with a fan flange 142, and the fan cavity 141 is provided with a fan blade 210, the fan blade 210 is installed on the output shaft 120, so that the output shaft 120 can drive the fan blade 210 to rotate when rotating. Of course, the fan blade 210 can also be installed on an independent fan blade motor, so as to control the running state of the fan blade 210 by using the fan blade motor, and the design can greatly improve the flexibility of controlling the running state of the fan blade 210.

[0038] The fan flange 142 is fixed with the end cover 150, and the end cover 150 is provided with a plurality of end cover holes 151 distributed from inside to outside, and the waterproof and breathable member 300 is installed outside the end cover hole 151, and the waterproof and breathable film 310 is installed on the waterproof and breathable member 300. The waterproof and breathable film 310 can allow airflow to pass through but not water, and the waterproof and breathable film can be a polytetrafluoroethylene film, a TPU transparent frosted semi-transparent film, an ePTFE waterproof and breathable film, etc. Of course, the waterproof and breathable film 310 can also be directly sealed and pasted on the end cover 150, so that the airflow can pass through but the water cannot pass through by using the waterproof and breathable film 310.

[0039] The end cover 150 and the waterproof and breathable member 300 are installed in the outer cover 130, the outer cover 130 is installed on the fan cover 140, and the outer cover 130 is provided with a plurality of through outer cover holes 131 for facilitating airflow.

[0040] In combination Figure 5 When the motor is started or the fan blade motor is started, the fan blade 210 rotates to blow the airflow to the rotor in the motor body 110, and the airflow is formed in the motor 110, so that the heat can be quickly led out, and the rotor is quickly cooled. In the use process, there may be a pressure difference between the inside and outside of the motor body 110, at this time, a part of the waterproof and breathable film corresponding to the end cover hole 151 is in the state of convection of discharging the airflow in the motor body 110 to the outside, and the other part of the waterproof and breathable film corresponding to the end cover hole 151 is in the state of convection of pumping the airflow in the motor body 110 to the motor body 110. Although the amount of such convection is small due to the blocking of the waterproof and breathable film, this way can quickly and uniformly transfer the heat in the motor, thereby increasing the heat dissipation performance of the motor shell, on the other hand, part of the convection, the exhaust gas in the motor carries the temperature output, and the outside air enters the motor to absorb heat, thereby greatly improving the heat dissipation performance of the motor. At the same time, this design does not need to add a fan to blow the motor shell outside to dissipate heat, thereby greatly simplifying the structure. Moreover, the design of the embodiment makes the fan blade rotate synchronously to dissipate heat after the motor is started, so as to quickly and uniformly transfer the heat in the motor. At this time, the motor shell, the convection of the inside and outside air can realize high-efficiency heat dissipation, so the rotation speed of the fan blade does not need to be too fast to realize better heat dissipation effect, which is more energy-saving. Through actual measurement, the internal temperature of the embodiment is difficult to exceed 100℃, which means that there is no demagnetization risk, and the service life of the motor can reach two years or more, but the cost is almost not increased, and the cost will be lower than that of the existing similar products after subsequent standardization and mass production.

[0041] Of course, due to the use of the fan is always rotating, so that the motor body inside and outside the airflow is always in convection, so even without the motor shell heat dissipation, the heat dissipation effect of the embodiment is much higher than the traditional fan blowing motor shell effect. For the motor inside the high temperature, the main reason is that the heat is gathered, through the motor shell heat dissipation slow, and the embodiment is always in heat dissipation, and adopt direct through the convection effect of gas discharge, just form similar to the effect of the chimney, the convection speed is fast, the heat exchange speed is also fast. Embodiment two

[0042] Referring to Figures 6-10 Because the waterproof breathable film 310 is a very thin film, in order to avoid being damaged in the process of use, the embodiment is also provided with a protective net 320 at both ends of the waterproof breathable film 310, the protective net 320 is provided with a plurality of through holes, the protective net 320 is fixed on the waterproof breathable member 300 and clamps the waterproof breathable film 310 in the middle. This design can greatly increase the strength of the waterproof breathable film 310 in the thickness direction, and can prevent some small particles and sharp objects from piercing the waterproof breathable film, thereby greatly improving the service life of the product and reducing maintenance costs. In addition, the mesh hole can ensure its air permeability, thereby providing the basis for the airflow convection inside and outside the waterproof breathable film 310.

[0043] This design is mainly based on the fact that in actual use, sharp straw, branches, stones and other objects may pass through the outer cover hole 131 and directly impact the waterproof breathable film 310, causing the waterproof breathable film 310 to be damaged, which may cause the motor to be waterlogged and certain maintenance costs. In addition, in actual use, if the pressure difference between the inside and outside of the waterproof breathable film is too large, it may generate a large blowing force or negative pressure to the waterproof breathable film, thereby causing the waterproof breathable film 310 to be easily torn, deformed or broken. After adding the protective net 320, the protective net 320 provides good support to the two end surfaces of the waterproof breathable film, thereby reducing the probability of being torn, deformed or broken. Embodiment three

[0044] Referring to Figure 11In this embodiment, the waterproof and breathable member 300 is replaced by a waterproof and breathable head, which includes a connector pipe 410, a connector seat 420, and a connector cap 430. One end of the connector pipe 410 is assembled with the connector seat 420, and the other end is sealed into the end cover hole 151. The connector cap 430 has a hollow connector cap cavity 431 inside. A plurality of connector cap holes 432 are provided on the outer wall of the connector cap 430 and communicate with the connector cap cavity 431. The connector seat 420 is assembled and fixed in the connector cap cavity 431. A diaphragm seat 440 is installed in the connector cap cavity 431. A waterproof and breathable diaphragm 310 is fixedly installed on the diaphragm seat 440. The waterproof and breathable diaphragm 310 separates the communication between the connector pipe 410 and the connector cap cavity 431. The connector cap 430 is located at one end of the outer cover 130.

[0045] This design seals the end cover hole 151 with the corresponding waterproof and breathable head, while retaining the waterproof and breathable function of the waterproof and breathable diaphragm 310. The connector cap 430 protects the waterproof and breathable diaphragm 310, making it difficult for external foreign matter to damage the waterproof and breathable diaphragm 310. It is also convenient for subsequent maintenance, as only the damaged waterproof and breathable head needs to be replaced. Embodiment Four

[0046] Referring to Figures 12-13 After long-term use, the waterproof and breathable diaphragm may be damaged due to external impact, aging of the waterproof and breathable diaphragm, etc. However, embodiments one to three do not have a design that can timely detect damage to the waterproof and breathable diaphragm, causing the motor to be flooded. If the waterproof and breathable diaphragm is actually damaged and not timely treated, it is easy to cause the motor to be flooded, thereby causing the motor to be scrapped.

[0047] To this end, the present embodiment adopts the following improvement scheme:

[0048] An extrusion ring 143 is also provided in the fan cavity 141 of the fan cover 140. An expansion ring 520 is also installed on the portion between the extrusion ring 143 and the fan flange 142. The expansion ring 520 has a hollow expansion cavity 521 inside, which is filled with an insulating liquid. The expansion ring 520 is made of water-swelling rubber, and the insulating liquid is a non-conductive liquid, such as transformer oil.

[0049] The expansion cavity 521 is communicated with one end of the connecting pipe 530, the other end of the connecting pipe 530 is inserted into the display shell 540 after passing through the fan cover 140, and the display shell 540 is made of transparent material. The inside of the display shell 540 is a hollow display cavity 541, the inside of the connecting pipe 530 is a hollow connecting pipe cavity 531, one end of the connecting pipe cavity 531 is inserted and sealed with the sealing head 561, the sealing head 561 is provided with a flow guide groove 562, and the sealing head 561 is installed on the sealing element 560, the sealing element 560 and the inner end face of the display cavity 541 are pressed or assembled with the two ends of the spring 550 respectively, and the spring 550 applies elastic force to the sealing element 560 to push the connecting pipe cavity 531 to keep the sealing head 561 sealed.

[0050] The end cover 150 is close to the end face of the fan blade 210, the inner side of the end cover hole 151, and the outer wall of the fan flange 142, and is close to the water absorption element 510, the water absorption element 510 is made of high water absorption material, and the water absorption element 510 is close to the end face of the expansion ring 520.

[0051] In use, once the waterproof and breathable film 310 is damaged or water leaks at the end cover 150, the water is absorbed by the water absorption element 510 and guided to the expansion ring 520, the expansion ring 520 expands when encountering water, thereby extruding the insulating liquid in the inside of the expansion ring 520, the hydraulic pressure of the liquid is increased, thereby pushing the sealing head 561 to overcome the elastic force of the spring to open the sealing element 560, until the connecting pipe cavity 531 is communicated with the display cavity 541 or the connecting pipe cavity 531 is communicated with the display cavity 541 through the flow guide groove 562, then the insulating liquid enters the display cavity 541, at this time, it is convenient for the user to observe, thereby timely maintenance, preventing the motor from being waterlogged and scrapped. The design of the flow guide groove 562 is mainly to connect the connecting pipe cavity 531 and the display cavity 541 through the flow guide groove 562 when the sealing head 561 is not completely withdrawn from the connecting pipe cavity 531. The design of the spring is mainly to increase a resistance to prevent the sealing head 561 from being opened by mistake.

[0052] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the skilled person in the field to which the present application belongs.

[0053] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0055] In the present application, the circumferentially rotatable assembly is a connecting assembly that can rotate relative to each other, such as through a bearing assembly; the circumferentially rotatable and axially immovable assembly is an assembly that can rotate relative to each other, but cannot move axially, such as installing shaft clamps on both sides of the shaft and the mounting device to prevent the shaft from moving axially; the circumferentially rotatable and axially movable assembly is a movable assembly, such as a shaft assembly through a shaft hole; the circumferentially immovable and axially movable assembly can be a spline groove and spline assembly.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0058] The above is only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A fully sealed motor with good heat dissipation, comprising a motor body and an output shaft installed in the motor body; characterized in that: a fan cover is installed on the motor body, the fan cover has a hollow fan cavity inside, fan blades and an end cover are installed in the fan cavity, the fan blades are installed on the output shaft or the fan blades are installed on the motor shaft of a fan motor, the output shaft or the fan motor drives the fan blades to rotate; the end cover is assembled with the fan cover, a plurality of end cover holes are arranged on the end cover and distributed from inside to outside, and the end cover holes are directly or indirectly sealed and closed by waterproof and breathable membranes. A fan flange is arranged in the fan cavity, and the fan flange is assembled and fixed with the end cover. 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member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable member, the waterproof and breathable 2. The totally enclosed electric machine of claim 1, wherein: ​ 3. The totally enclosed electric motor of claim 1 wherein: ​ 4. A totally enclosed electric machine according to any one of claims 1-3, characterized in that: ​ 5. A totally enclosed electric machine according to any one of claims 1-3, characterized in that: ​ 6. The totally enclosed electric motor of claim 5 wherein: ​ 7. The totally enclosed electric motor of claim 6 wherein: ​ 8. The totally enclosed electric machine of any one of claims 1-3, wherein: ​ 9. The totally enclosed electric motor of claim 8 wherein: ​ 10. The totally enclosed electric motor of claim 2 wherein: ​ ​ ​

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