CN111917243A - A ceiling fan motor with dual cooling air path structure - Google Patents

Abstract

A ceiling fan motor with a self-contained dual cooling air duct structure relates to the technical field of ceiling fan motors and solves technical problems such as motor damage of industrial ceiling fans, and includes a rotor assembly and a stator assembly; The lower end cover; the annular array on the upper end cover has air inlet holes, the annular array on the hub has ventilation holes, and the annular array on the lower end cover has air outlet holes; the air inlet holes, ventilation holes and air outlet holes constitute the main cooling air path; inside the upper end cover There is an upper end cover groove on the side; a circular ring is provided on the winding insulating plate; the gap between the upper end cover groove and the ring, the groove on the stator iron core, and the gap between the hub and the lower end cover constitute the cooling air bypass. The dripping water is blocked by the ring and cannot enter the stator iron core, and the dust can also be blocked by the ring, which effectively protects the motor and makes the motor meet the IP23 protection level; the invention forms two parallel cooling air duct structures to improve the cooling effect of the motor. .

Description

A ceiling fan motor with dual cooling air path structure

technical field

The invention relates to the technical field of ceiling fan motors, in particular to the improvement of cooling structures of industrial ceiling fan motors.

Background technique

In the design of modern industrial ceiling fans, the permanent magnet torque motor is usually used to directly drive the ceiling fan blades. This type of high-efficiency motor has the characteristics of high efficiency and high power density, and the corresponding loss density is also relatively large. The temperature rise is relatively high, especially the stator winding. Compared with traditional motors, permanent magnet torque motors have higher and faster temperature rises during operation. In this case, in order to solve the problem of motor heating and temperature rise, many motors pass through the heat dissipation holes of the upper and lower end covers to form the internal air of the motor. To solve the problem of temperature rise, it is generally divided into the main cooling air path and the bypass. The main path of the air path is to dissipate heat from the heat dissipation holes of the upper end cover - the through holes of the hub - the heat dissipation holes of the lower end cover. The dust and water droplets entrained in the air convection will not cause damage to the motor windings. However, the bypass path of the air path is the heat dissipation hole of the upper end cover - the fan blade of the end cover - the winding groove path - the heat dissipation hole of the lower end cover. The airflow through this path is easy to make more dust and even water droplets enter the internal winding of the motor, resulting in damage to the motor. Therefore, in order to ensure the safe and stable operation of the motor, it is necessary to develop a new cooling structure design according to the characteristics of the permanent magnet torque motor.

SUMMARY OF THE INVENTION

To sum up, the purpose of the present invention is to solve technical deficiencies such as the cooling structure of an industrial ceiling fan that easily allows dust and even water droplets to enter the internal windings of the motor, resulting in damage to the motor, and proposes a ceiling fan motor with a dual cooling air path structure.

In order to solve the technical problem proposed by the present invention, the technical scheme adopted is:

A ceiling fan motor with a self-contained dual cooling air path structure includes a rotor assembly and a stator assembly; the rotor assembly includes a rotor casing, a rotor body fixed in the rotor casing, an upper end cover arranged on the upper end of the rotor casing, and The lower end cover is arranged on the lower end of the rotor casing; the stator assembly includes a stator shaft, a hub, a stator iron core, a winding insulating plate and a winding; the stator shaft is respectively connected with the upper end cover and the lower end cover through bearings. The iron core is placed in the rotor casing, the stator iron core is fixedly connected with the stator shaft through the hub, the winding insulating plate is arranged on the stator iron core, and the winding is arranged on the winding insulating plate; There are several air inlet holes in the annular array on the upper end cover, a plurality of ventilation holes corresponding to the air inlet holes in the annular array on the hub, and a plurality of air inlet holes in the annular array on the lower end cover. Several air outlet holes corresponding to the ventilation holes; the air inlet holes, the ventilation holes and the air outlet holes constitute the main cooling air path; the inner side of the upper end cover is provided with an annular upper end cover at the position corresponding to the junction between the hub and the stator iron core groove; the winding insulating plate is provided with a ring that protrudes upwards into the groove of the upper end cover, the gap between the groove of the upper end cover and the ring, a number of holes on the stator iron core The slots between the windings and the gap between the hub and the lower end cover constitute the cooling air bypass; the bypass air inlet and the bypass air outlet of the cooling air bypass are respectively communicated with the cooling air main path.

As the technical scheme further limiting the present invention includes:

The top of the upper end cover is provided with two or more first-level radial fan blades for guiding wind to the air inlet holes.

The distance from the center of the air inlet hole to the center of the upper end cover is equal to the distance from the center of the first-stage radial fan blade to the center of the upper end cover.

The first-stage radial fan blades are radially evenly distributed on the upper end cover.

The upper end cover is also provided with a secondary radial fan blade, and the distance from the center of the primary radial fan blade to the center of the upper end cover is smaller than the distance from the center of the secondary radial fan blade to the center of the upper end cover. ; The cooling air bypass air inlet is arranged between the first-stage radial fan blades and the second-stage radial fan blades.

The secondary radial fan blades are radially evenly distributed on the upper end cover.

The beneficial effects of the present invention are as follows: the present invention has a two-stage series-excited bypass cooling air duct with IP23 protection, and realizes IP23 protection under the condition that the bypass air duct inside the motor is not affected, and the cooling air duct has a simple structure and is easy to produce. The manufacturing cost is low and the cooling effect is good, which can effectively reduce the temperature rise of the motor and improve the operation efficiency of the motor.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the present invention;

Fig. 2 is the schematic diagram of enlarged structure principle of cooling air bypass of the present invention;

FIG. 3 is a schematic diagram of the three-dimensional structure of the upper end cap of the present invention;

Fig. 4 is the brief structural principle schematic diagram of the present invention;

FIG. 5 is a schematic diagram of the inherent wind field during use of the present invention.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present application, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features of the embodiments may be combined with each other unless there is conflict. Many specific details are set forth in the following description to facilitate a full understanding of the present application, and the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

It should be noted that, unless otherwise specified, when a feature is called "fixed" or "connected" to another feature, it can be directly fixed or connected to another feature, or it can be indirectly fixed or connected to another feature. on a feature. In addition, the descriptions of upper, lower, left, right, etc. used in the present invention are only relative to the mutual positional relationship of each component of the present invention in the accompanying drawings. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the present application are for the purpose of describing particular embodiments only, and are not intended to limit the present application.

The structure of the present invention will be further described below with reference to FIGS. 1 to 5 and preferred specific embodiments of the present invention.

The present invention discloses a ceiling fan motor with a self-contained dual cooling air path structure, which includes two parts: a rotor assembly 1 and a stator assembly 2 .

The rotor assembly 1 includes a rotor casing 11 , a rotor body 12 fixed in the rotor casing 11 , an upper end cover 13 disposed on the upper end of the rotor casing 11 , and a lower end cover 14 disposed on the lower end of the rotor casing.

The stator assembly 2 includes a stator shaft 21, a hub 22, a stator core 23, a winding insulating plate 24 and a winding; the stator shaft 21 is rotatably connected to the upper end cover 13 and the lower end cover 14 through two bearings 211 respectively; The stator iron core 23 is placed in the rotor casing 11, and is electromagnetically driven and matched with the rotor body 12; the stator iron core 23 is fixedly connected with the stator shaft 21 through the hub 22; the winding insulating plate 24 is arranged on the stator iron core 23, and the windings are arranged around On the wire insulating plate 24; a plurality of windings on the stator core 23 are provided with upper and lower connected slots.

Compared with the prior art, the present invention mainly lies in that a plurality of air inlet holes 131 are arranged in an annular array on the upper end cover 13 , and a plurality of air inlet holes 221 corresponding to the air inlet holes 131 are arranged in an annular array on the hub 22 . There are a plurality of air outlet holes 141 corresponding to the ventilation holes 221 in an annular array on the lower end cover 14 of the lower end cover 14; Since the hub 22 has low requirements for dust and water resistance, during the operation of the motor, after the outside air enters from the air inlet hole 131, it flows through the ventilation hole 221 on the hub 22 to cool the hub 22, and the hub 22 indirectly cools the stator. The iron core 23 performs heat exchange and absorbs the heat of the stator iron core 23 .

In order to directly air-cool the stator iron core 23 and ensure that the stator iron core 23 meets the IP23 protection level requirements, the inner surface of the upper end cover 13 is provided with an annular upper end cover concave corresponding to the junction position between the hub 22 and the stator iron core 23 Slot 132; the winding insulating plate 24 is provided with a ring 241 that protrudes upward into the upper end cover groove 132; the gap between the upper end cover groove 132 and the ring 241, the stator The slots between several windings on the iron core 23 and the gap between the hub and the lower end cover 14 of 22 constitute a cooling air bypass; the bypass air inlet and bypass air outlet of the cooling air bypass are respectively connected to the main cooling air path. In the same way, part of the cold air entering the air inlet hole 131 enters the cooling air bypass under the action of centrifugal force, so as to directly air-cool the stator iron core 23 .

The IP23 protection level of the motor means that it can prevent solid foreign objects with a diameter greater than 12mm from entering the casing, and can prevent fingers from touching the live or moving parts in the casing; dripping water within an angle of 15 ^° from the plumb line should not directly enter the motor. As shown in FIG. 2 , in the present invention, due to the existence of an upwardly protruding ring 241 , part of the cold air entering the air inlet hole 131 needs to rise along the ring 241 from the top of the ring 241 and the groove bottom of the upper end cover groove 132 The gap crosses the ring 241, and then goes down to the grooves between several windings on the stator core 23, and the stator core 23 is air-cooled. The water dripping from the air inlet hole 131 is blocked by the ring 241 and cannot enter the stator core 23, and the dust entrained in the cold air can also be effectively blocked by the ring 241 and cannot enter the slot on the stator core 23. The motor effectively protects the motor, so that the motor of the present invention conforms to the IP23 protection level; by setting the cooling air bypass, two parallel cooling air paths are formed with the cooling air main path, which further improves the cooling effect of the motor.

In order to allow the outside cold air to better enter from the air inlet holes 131 to form a strong airflow, as shown in FIG. First stage radial blades 134 . The distance from the center of the air inlet hole 131 to the center of the upper end cover 13 is equal to the distance from the center of the first-stage radial fan blade 134 to the center of the upper end cover. That is to say, the air inlet holes 131 and the first-stage radial fan blades 134 are located in the annular area of the same diameter of the upper end cover 13, and are evenly distributed; during the rotation of the motor of the present invention, the first-stage radial fan blades 134 can realize the air inlet holes. The cold air input in 131 is stirred to increase the airflow intensity of the cooling air main path and the cooling air bypass, speed up the flow speed of the cold air inside the present invention, and realize the cooling and heat dissipation effect of the cooling air path.

In the specific implementation process, a plurality of secondary radial fan blades 135 may also be provided on the upper end cover as required, and the distance from the center of the primary radial fan blade 134 to the center of the upper end cover 13 is smaller than that of the upper end cover 13 . The distance from the center of the secondary radial fan blade 135 to the center of the upper end cover 134; the cooling air bypass inlet 136 can be separately provided on the primary radial fan blade 134 and the secondary radial fan blade between 135. The secondary radial fan blades are radially evenly distributed on the upper end cover.

The preferred embodiments of the present invention have been described in detail above, and it should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, any technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the present invention according to the present invention shall be within the protection scope determined by the present claims.

Claims (6)

1. A ceiling fan motor with a double cooling air path structure comprises a rotor assembly and a stator assembly;

the rotor assembly comprises a rotor shell, a rotor body fixed in the rotor shell, an upper end cover arranged at the upper end of the rotor shell and a lower end cover arranged at the lower end of the rotor shell;

the stator assembly comprises a stator shaft, a hub, a stator core, a winding insulation plate and a winding; the stator shaft is respectively and rotatably connected with the upper end cover and the lower end cover through bearings, the stator core is arranged in the rotor shell and fixedly connected with the stator shaft through a hub, the winding insulation plate is arranged on the stator core, and the winding is arranged on the winding insulation plate; a plurality of windings on the stator core are provided with slot circuits which are communicated up and down;

the method is characterized in that:

the upper end cover is provided with a plurality of air inlet holes in an annular array, the hub is provided with a plurality of air vent holes corresponding to the air inlet holes in the annular array, and the lower end cover is provided with a plurality of air outlet holes corresponding to the air vent holes in the annular array; the air inlet hole, the air vent and the air outlet hole form a cooling air main path;

an annular upper end cover groove is formed in the inner side face of the upper end cover at the position corresponding to the junction position of the hub and the stator core; a circle of circular ring which protrudes upwards into the groove of the upper end cover is arranged on the winding insulating plate, and a cooling air bypass is formed by a gap between the groove of the upper end cover and the circular ring, a slot circuit between a plurality of windings on the stator core and a gap between the hub and the lower end cover; and a bypass air inlet and a bypass air outlet of the cooling air bypass are respectively communicated with the cooling air main path.

2. The ceiling fan motor with dual cooling air path structure as claimed in claim 1, wherein: the top of upper end cover be equipped with more than two and be used for the radial flabellum of one-level to the fresh air inlet wind-guiding.

3. The ceiling fan motor with dual cooling air path structure as claimed in claim 2, wherein: the distance from the center of the air inlet hole to the center of the upper end cover is equal to the distance from the center of the first-stage radial fan blade to the center of the upper end cover.

4. The ceiling fan motor with dual cooling air path structure as claimed in claim 2, wherein: the first-stage radial fan blades are radially and uniformly distributed on the upper end cover.

5. The ceiling fan motor with dual cooling air path structure as claimed in claim 2, wherein: the upper end cover is also provided with a second-stage radial fan blade, and the distance from the center of the first-stage radial fan blade to the center of the upper end cover is smaller than the distance from the center of the second-stage radial fan blade to the center of the upper end cover; and the cooling air bypass air inlet is arranged between the first-stage radial fan blade and the second-stage radial fan blade.

6. The ceiling fan motor with dual cooling air path structure as claimed in claim 5, wherein: the second-stage radial fan blades are radially and uniformly distributed on the upper end cover.

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