Totally-enclosed generator structure

Abstract

The utility model relates to a totally-enclosed generator structure, which comprises a casing internally provided with a stator and a rotor, the front end of the casing is connected with a front cover, the rear end of the casing is connected with a rear cover, the casing, the front cover and the rear cover form a closed casing structure, and the inner periphery of the casing is provided with a plurality of air return channels along the front-back direction. A fan blowing air towards the front end of the air return channel is arranged in the middle of the front cover, and the center of the fan is connected to a rotating shaft of the rotor. The totally-enclosed generator is ingenious in structural design and novel in structure, adopts a totally-enclosed structure, does not have an air inlet or an air outlet, is high in protection grade, can reach IP44 and above, and can quickly and effectively dissipate heat of the motor, thereby improving the performance of the motor and prolonging the service life of the motor.

Description

Technical Field

[0001] The utility model relates to the field of generators, in particular to a fully enclosed generator structure. Background Art

[0002] Ordinary small and medium-sized generators use a self-fan cooling method. The heat of the stator and rotor is dissipated through the fan on the rotor. When the rotor rotates, wind pressure is generated. The heat generated by the stator and rotor will be directly discharged to the outside of the generator for cooling. The entire cooling device includes a fan, front cover, base, air inlet, air outlet, etc. Figure 1 As shown, since it is not a fully enclosed structure, the protection level is low and can only reach IP23 protection level. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a fully enclosed generator structure with a high protection level, which can quickly and effectively dissipate the heat of the motor, thereby improving the motor performance and increasing the life of the motor.

[0004] The utility model is implemented by the following scheme: a fully enclosed generator structure, including a casing with a stator and a rotor arranged inside, the front end of the casing is connected to a front cover, and the rear end is connected to a rear cover, the casing, the front cover and the rear cover form a closed outer shell structure, the inner periphery of the casing is provided with a plurality of return air passages along the front and rear directions, a fan is provided in the middle of the front cover for blowing air toward the front end of the return air passage, and the center of the fan is connected to the rotating shaft of the rotor.

[0005] Furthermore, the inner wall of the front cover is connected to a partition between the fan and the return air channel, and the partition is provided with a plurality of jet holes with an inlet end facing the fan and an outlet end aligned with the front end of the return air channel. The diameter of the return air channel gradually decreases from the two ends to the middle.

[0006] Furthermore, the outer peripheral wall of the stator is in contact with the inner wall of the casing.

[0007] Furthermore, heat dissipation ribs are distributed on the outer periphery of the casing.

[0008] Compared with the prior art, the utility model has the following beneficial effects: the fully enclosed generator of the utility model has an ingenious structural design and a novel structure, adopts a fully enclosed structure, has no air inlet or outlet, has a high protection level, can reach IP44 and above, can quickly and effectively dissipate the heat of the motor, thereby improving the motor performance and increasing the life of the motor.

[0009] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1is a partial cross-sectional view of a prior art generator;

[0011] Figure 2 This is a partial cross-sectional view of a generator according to an embodiment of the utility model;

[0012] Figure 3 This is the working principle diagram of the ejector;

[0013] Figure 1 , Figure 2 Explanation of the bid numbers: 1-air inlet, 2-air outlet, 3-fan, 4-casing, 5-stator, 6-rotor, 7-front cover, 8-rear cover, 9-return air duct, 10-partition, 11-jet hole, 12-heat dissipation ribs. DETAILED DESCRIPTION

[0014] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0015] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0016] like Figure 2 As shown, a fully enclosed generator structure includes a casing 4 with a stator 5 and a rotor 6 inside, the stator and the rotor are formed by stacking a plurality of stator punching sheets, and a coil is wound thereon, the front end of the casing 4 is connected to a front cover 7, and the rear end is connected to a rear cover 8, the casing, the front cover and the rear cover form a closed outer shell structure, the inner periphery of the casing 4 is provided with a plurality of return air channels 9 along the front and rear directions, a fan 3 is provided in the middle of the front cover for blowing air toward the front end of the return air channel, and the center of the fan 3 is connected to the rotating shaft of the rotor.

[0017] The utility model generator has a fully enclosed structure, has no air inlet or outlet, and has a protection level of IP44 or above. It adopts an internal air circulation method to dissipate heat. The heat generated by the stator and the rotor can be dissipated through heat conduction of the casing. The air in the middle of the generator flows from back to front to take away the heat of the stator and the rotation. The air taking away the heat flows back to the rear end of the engine through the return air channel on the inner side of the casing, and transfers the heat to the casing and dissipates it to the outside during the process of flowing through the return air channel.

[0018] In this embodiment, the inner wall of the front cover 7 is connected to a partition 10 which is separated between the fan and the return air channel. There are gaps between the partition and the fan and between the partition and the front end of the return air channel. There is also a gap between the partition and the rotating shaft of the rotor. The partition 11 is provided with a plurality of jet holes 11 with an inlet end facing the fan and an outlet end facing the front end of the return air channel. The diameter of the return air channel 9 gradually decreases from the two ends to the middle. The front side of the partition is a compartment cavity, and the back side is a mixing chamber. The fan is located in the compartment cavity. The fan rotates to form high-pressure gas. Part of the air is ejected from the compartment cavity into the return air duct through the jet hole, and the other part of the air enters the return air duct from the mixing chamber. The high-pressure gas forms an ejector effect through the jet hole and the return air duct, which accelerates the air flow inside the generator (the inner surface of the stator and the outer surface of the rotor) and brings its heat to the return air duct. The return air duct is connected to the casing, and the heat of the air is conducted to the casing through the return air duct and dissipated to the outside through heat radiation, reducing the heat of the wind in the return air duct. The wind enters the generator (the inner surface of the stator and the outer surface of the rotor) from the outlet of the return air duct, thereby cooling the copper wire and iron core.

[0019] Since the casing is provided with a return air channel using the ejector principle, driven by the fan, the air flows faster inside the engine, thereby quickly taking away the heat generated by the rotor and stator when they are working, and the heat is transferred to the casing through the return air channel, and the casing is transferred to the surrounding environment through heat conduction, thereby solving the problem of poor heat dissipation of the rotor of the closed generator and improving the heat dissipation effect of the whole machine. The utility model is cleverly designed, simple and novel in structure, can quickly and effectively dissipate heat from the motor, thereby improving motor performance, saving major costs such as iron cores, and at the same time increasing the life of the motor.

[0020] like Figure 3 As shown in the figure, the ejector works as follows: After the high-pressure gas passes through the nozzle, due to adiabatic expansion, the pressure energy in the high-pressure moving fluid is converted into kinetic energy, causing the flow rate to increase but the pressure to drop. At this time, due to the pressure drop of the moving fluid, it will form a low-pressure area in the mixing chamber. Due to the existence of the low-pressure area, the mixing chamber will inhale the fluid and mix the inhaled fluid with the moving fluid in the mixing chamber; the mixed fluid then enters the venturi-shaped diffuser, where they are fully mixed and the kinetic energy is converted back into pressure energy; the final result will be a mixed fluid with a pressure higher than the low-pressure inhaled fluid but lower than the high-pressure moving fluid.

[0021] In this embodiment, the outer peripheral wall of the stator 5 is attached to the inner wall of the casing. At the same time, the stator core is in close contact with the casing, and the heat of the stator is directly transferred to the casing through heat conduction and dissipated to the surrounding environment through heat radiation.

[0022] In this embodiment, heat dissipation ribs 12 are distributed on the outer periphery of the housing to increase the heat dissipation area of ​​the housing and improve the heat dissipation effect.

[0023] Unless otherwise stated, any technical solution disclosed in the above utility model, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many feasible numerical values. Since there are too many numerical values ​​to be exhaustive, the utility model discloses only some numerical values ​​to illustrate the technical solution of the utility model, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the utility model.

[0024] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0025] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0026] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0027] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A fully enclosed generator structure, characterized in that: It includes a casing with a stator and a rotor inside, the front end of the casing is connected to a front cover, and the rear end is connected to a rear cover, the casing, the front cover and the rear cover form a closed shell structure, the inner periphery of the casing is provided with a plurality of return air passages along the front and rear directions, a fan is provided in the middle of the front cover for blowing air toward the front end of the return air passage, and the center of the fan is connected to the rotating shaft of the rotor.

2. The fully enclosed generator structure according to claim 1, characterized in that: The inner wall of the front cover is connected with a partition between the fan and the return air channel. The partition is provided with a plurality of jet holes with an inlet end facing the fan and an outlet end facing the front end of the return air channel. The diameter of the return air channel gradually decreases from the two ends to the middle.

3. The fully enclosed generator structure according to claim 1, characterized in that: The outer peripheral wall of the stator is attached to the inner wall of the casing.

4. The fully enclosed generator structure according to claim 1, characterized in that: The outer periphery of the housing is provided with heat dissipation ribs.

Images