CN218276280U - A new type of motor end cover and motor - Google Patents

Abstract

The utility model discloses a novel motor end cover, include: a bearing chamber for mounting a bearing; the end cover spigot can be connected with the stator assembly; the end cover wall cavity is connected between the outer wall of the bearing chamber and the end cover spigot and comprises an inner ring part body, an inclined part body and an outer ring part body which are arranged along the radial direction, and the inclined part body extends outwards in an inclined mode along the axial direction from the inner ring part body to the outer ring part body and from the direction of the end cover spigot; and the heat dissipation unit is arranged on one side surface of the end cover wall cavity far away from the end cover seam allowance. The utility model also discloses a motor. The utility model discloses utilize the shape design in end cover wall chamber for the bearing room is extensive, and utilize distribution, arrangement and the shape design of radiating element, increased heat radiating area, reduced the bearing temperature, the bearing temperature descends 9.1, about 10% on average decline, guarantees bearing life, guarantees all the other performance index of motor simultaneously again.

Description

A new type of motor end cover and motor

technical field

The utility model belongs to the technical field of motor equipment, in particular to a novel motor end cover and a motor.

Background technique

At present, most of the motors on the market are designed with built-in bearings. When running under high ambient temperature conditions, the built-in bearings are not easy to dissipate heat and cool down, so the bearing temperature is often too high, which will cause an alarm, cause the equipment to stop, and cause damage to the motor in severe cases. . In order to improve the high temperature of the bearing, an external bearing cover is designed, and heat dissipation ribs are added outside the bearing chamber to dissipate heat from the bearing, reduce the bearing temperature, and ensure the normal operation of the equipment. For example, ring-shaped cooling ribs and radial ribs are set on the outer end surface of the end cover.

The cooling fan is also used to dissipate heat from the base. In the field of three-phase asynchronous motors, since the cooling fan mainly focuses on dissipating heat from the base, it cannot effectively cool the bearings. Therefore, the temperature of the bearings often uses self-radiation and is limited by the temperature of the motor itself. liter and the influence of the ambient temperature, which increases accordingly. In order to solve this problem, the usual way is to reduce the temperature rise of the motor by increasing the air volume of the fan, thereby reducing the bearing temperature. However, due to the increase of the fan, new problems will follow. They are: (1) Due to the increase of air volume, the wind wear of the motor will increase, and the efficiency of the motor will decrease accordingly, which will not meet the requirements of high energy efficiency motors, resulting in the motor becoming unqualified product. ②Due to the increase of air volume, wind noise increases, especially for 2P motors, which will cause increased noise and reduce the market competitiveness of products. ③ Due to the increase of the fan, the risk of motor vibration may increase.

In practice, neither of the above two heat dissipation methods can achieve ideal results.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a new type of motor end cover and motor with increased heat dissipation area, effective heat dissipation, and no influence on the normal use of the bearing.

The technical solution adopted by the utility model to solve the technical problem is: a novel motor end cover, comprising:

Bearing chamber for installing bearings;

The end cover seam can be connected with the stator assembly;

The wall cavity of the end cover is connected between the outer wall of the bearing chamber and the seam of the end cover, which includes an inner ring body arranged radially, an inclined body, and an outer ring body, and the inclined body is formed from the inner ring body To the outer ring body, from the direction where the end cover seam is located, it extends obliquely outward in the axial direction;

The heat dissipation unit is arranged on the surface of the wall cavity of the end cover away from the notch of the end cover.

The utility model utilizes the shape design of the wall cavity of the end cover to extend the bearing chamber, and uses the heat dissipation unit to increase the heat dissipation area, reduce the bearing temperature, and ensure the service life of the bearing.

Further, one end of the heat dissipation unit is connected to the outer surface of the bearing, and the other end is connected to the surface of the inclined body. One end of the heat dissipation unit is directly connected to the outer surface of the bearing to quickly dissipate the large amount of heat generated by the bearing and reduce the bearing temperature in time.

Further, the heat dissipation unit includes a plurality of heat dissipation rib groups, each heat dissipation rib group includes a plurality of parallel and spaced heat dissipation ribs, and the plurality of heat dissipation rib groups are radially distributed from the periphery of the bearing chamber. There is sufficient heat dissipation gap between adjacent heat dissipation ribs, and there is also sufficient heat dissipation space between adjacent heat dissipation rib groups, so as to ensure a good heat dissipation effect of the heat dissipation unit.

Further, one end of the heat dissipation rib is evenly distributed on the outer circumference of the bearing chamber; the heat dissipation unit extends to the surface of the outer ring body. One end of all heat dissipation ribs is evenly distributed on the outer circumference of the bearing chamber, which makes the heat dissipation of the bearing chamber more uniform; the heat dissipation unit extends to the surface of the outer ring, and its heat dissipation area is large, and the heat dissipation effect is better.

Further, the height of the highest point of the heat dissipation ribs is H, and the distance between adjacent heat dissipation ribs is L1, then L1=2/3H. Ensure that the heat dissipation ribs have sufficient heat dissipation area and heat dissipation space, so that the heat of the bearing chamber can be conducted outward in time.

Further, it also includes a reinforcing rib arranged on the side of the end cap wall cavity close to the end cap seam, which is connected to the surface of the inclined part body and the outer ring part body. The ribs can compensate the supporting strength of the wall cavity of the end cover and prevent the motor from vibrating during operation.

Further, the inner ring part body and the outer ring part body are arranged in parallel, and both the inner ring part body and the outer ring part body extend radially; the section of the wall cavity of the end cover is Z-shaped. Since the stator is connected to the end cover spigot, and the stator part is the main heat source of the motor temperature rise, the wall cavity of the end cover is Z-shaped, which can isolate the bearing from the heat source of the stator on the one hand, avoid heat superposition, and increase the stator wire package on the other hand. Space to prevent heat conduction from the stator.

Further, if the axial length of the bearing chamber is L, the distance between the inner ring body and the end face of the bearing chamber on the side away from the notch of the end cover is at least 2/3L. Ensure that 2/3L is exposed outside the bearing, keep the bearing away from the heat source of the stator, avoid heat superposition, and increase the space of the stator wire package to prevent the heat conduction of the stator.

Further, the inner wall of the seam of the end cap is connected to the reinforcing rib; the end surface of the seam of the end cap is provided with a connecting part, which is in the shape of a ring, with an axial length of 3-7 mm and a radial thickness of 3-5 mm.

A motor includes a motor main body and the above-mentioned novel motor end cover.

The beneficial effect of the utility model is that the bearing chamber is extended by utilizing the shape design of the wall cavity of the end cover, and the heat dissipation area is increased by utilizing the distribution, arrangement and shape design of the heat dissipation units, and the bearing temperature is reduced by 9.1° , The average decrease is about 10%, ensuring the service life of the bearing, and at the same time ensuring the rest of the performance indicators of the motor.

Description of drawings

Fig. 1 is the front view of the motor end cover in the utility model.

FIG. 2 is an enlarged view of the structure at A in FIG. 1 .

Fig. 3 is the first perspective view of the motor end cover in the utility model.

Fig. 4 is the second perspective view of the motor end cover in the utility model.

Fig. 5 is a side view of the motor end cover in the utility model.

Fig. 6 is a cross-sectional view of A-A in Fig. 5 .

Fig. 7 is a lateral side view of the motor end cover in the present invention.

Fig. 8 is a B-B sectional view in Fig. 7 .

detailed description

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the utility model. Obviously, the described The embodiments are only some of the embodiments of the present utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

As shown in FIGS. 1-6 , a new motor end cover includes a bearing chamber 1 , an end cover opening 2 , an end cover wall cavity 3 , and a cooling unit 4 .

Bearing chamber 1 is used to install bearings, and mainly plays the role of fixing bearings and heat conduction. Through the close fit between the size of the inner side of bearing chamber 1 and the outer circle of the bearing, the heat generated by the bearing during high-speed operation can be dissipated in time to ensure that the bearing Safe and reliable operation.

The end cover seam 2 can be connected with the stator assembly, which is the key hinge to ensure the mutual position between the stator and the rotor; the end face of the end cap seam 2 is provided with a connecting part 21, which is in the shape of a ring with an axial length of 3-7mm , that is, S=3-7mm in Fig. 6; the radial thickness is 3-5mm, that is, h=3-5mm in Fig. 6 . The circular runout of the outer surface of the end cap 2 relative to the center line of the bearing chamber 1 is less than 0.07 mm, so as to ensure that the inner circle of the bearing is evenly stressed during operation and prevent the motor from shaking.

The end cover wall cavity 3 is connected between the outer wall of the bearing chamber 1 and the end cover seam 2, and mainly acts as a fixed support for the end cap seam 2 and the bearing chamber 1, which includes radially arranged from inside to outside The inner ring part body 31, the inclined part body 32, and the outer ring part body 33, the inclined part body 32 extends obliquely outward in the axial direction from the inner ring part body 31 to the outer ring part body 33 and from the direction where the end cover seam 2 is located . In other words, defining the side where the end cap seam 2 is located as the inner side, and taking the direction shown in FIG. 5 as an example for illustration, the inclined body 32 extends obliquely from left to right and from inside to outside.

As shown in FIG. 6 , the axial length of the bearing chamber 1 is L, and the distance between the inner ring body 31 and the end face of the bearing chamber 1 away from the end cover 2 is at least 2/3L. That is to ensure that the bearing chamber 1 is exposed to 2/3L, and the bearing is kept away from the heat source of the stator to avoid heat superposition. It can also increase the space of the stator wire package to prevent heat conduction of the stator (the heat of the stator part is quickly dissipated through the action of the frame and the cooling fan).

In this embodiment, the inner ring part body 31 and the outer ring part body 33 are arranged in parallel, and both the inner ring part body 31 and the outer ring part body 33 extend radially, therefore, the cross section of the end cap wall cavity 3 is in a Z shape , as shown in Figure 7 and Figure 8.

The heat dissipation unit 4 is arranged on the surface of the wall cavity 3 of the end cover away from the notch 2 of the end cover, in other words, it is arranged outside the end cover of the motor. The heat dissipation unit 4 includes a plurality of heat dissipation rib groups 41 , and the plurality of heat dissipation rib groups 41 are radially distributed from the outer periphery of the bearing chamber 1 . Each cooling rib group 41 includes a plurality of cooling ribs 42 arranged in parallel and at intervals.

One end of the cooling rib 42 is connected to the outer surface of the bearing chamber 1, and the other end is connected to the surface of the inclined body 32, and even extends to the surface of the outer ring body 33. In other words, one side of the cooling rib 42 faces outward, The side opposite to it is not only integrally connected with the surface of the inner ring body 31 , but also integrally connected with the surface of the inclined body 32 and the surface of the outer ring body 33 . Therefore, the heat conducted from the wall cavity 3 of the end cover can be transferred to the outside for heat dissipation through the heat dissipation ribs 42 , the heat dissipation area is large, and the heat dissipation effect is good.

In this embodiment, each heat dissipation rib group 41 includes four heat dissipation ribs 42, and the number of heat dissipation rib groups 41 is eight, so one ends of all heat dissipation ribs 42 are evenly spaced on the outer periphery of the bearing chamber 1, increasing the bearing chamber 1 The heat dissipation surface quickly dissipates the large amount of heat generated, reduces the bearing temperature in time, and makes the heat dissipation of the bearing chamber 1 circumferentially to all places more uniform.

As shown in FIG. 6 , the height of the highest point of the cooling ribs 42 is H. As shown in FIG. 2 , the distance between adjacent cooling ribs 42 is L1, and L1=2/3H. The height of the heat dissipation ribs 42 and the distance between adjacent heat dissipation ribs 42 are guaranteed, so that the heat dissipation ribs 42 have a good heat dissipation effect and increase the heat dissipation area of the bearing chamber 1 .

The end cap wall cavity 3 is provided with a reinforcing rib 43 on the side close to the end cap notch 2, and the reinforcing rib 43 is connected to the surface of the inclined part body 32 and the outer ring part body 33, and the inner wall of the end cap notch 2 and the reinforcing rib 43 connected. There are a plurality of reinforcing ribs 43 , which are evenly spaced along the outer circumference of the bearing chamber 1 and extend radially toward the notch 2 of the end cap. The reinforcing rib 43 is mainly to compensate the support strength of the end cover wall cavity 3 and prevent the motor from vibrating. The inner wall of the mouth 2 has the same height and thickness as the cooling ribs 42.

A motor includes a motor body and a novel motor end cover with the above-mentioned structure. The motor body can be of any structure in the prior art, and details will not be described in detail.

The above-mentioned specific embodiments are used to explain the utility model, rather than to limit the utility model. Within the spirit of the utility model and the scope of protection of the claims, any modifications and changes made to the utility model fall into the scope of the utility model. scope of protection.

Claims (10)

1. A novel motor end cover, its characterized in that includes:

a bearing chamber (1) for mounting a bearing;

the end cover spigot (2) can be connected with the stator assembly;

the end cover wall cavity (3) is connected between the outer wall of the bearing chamber (1) and the end cover seam allowance (2) and comprises an inner ring part body (31), an inclined part body (32) and an outer ring part body (33) which are arranged along the radial direction, wherein the inclined part body (32) extends outwards in an inclined mode along the axial direction from the inner ring part body (31) to the outer ring part body (33) and from the direction of the end cover seam allowance (2);

and the heat dissipation unit (4) is arranged on one side surface of the end cover wall cavity (3) far away from the end cover seam allowance (2).

2. The novel motor end cap of claim 1, wherein: one end of the heat dissipation unit (4) is connected to the outer surface of the bearing chamber (1), and the other end of the heat dissipation unit is connected to the surface of the inclined part body (32).

3. The novel motor end cap of claim 2, wherein: the heat dissipation unit (4) comprises a plurality of heat dissipation rib groups (41), each heat dissipation rib group (41) comprises a plurality of heat dissipation ribs (42) arranged in parallel at intervals, and the plurality of heat dissipation rib groups (41) are radially distributed along the periphery of the bearing chamber (1).

4. The novel motor end cap of claim 3, wherein: one end of each heat dissipation rib (42) is uniformly distributed on the periphery of the bearing chamber (1) at intervals; the heat dissipation unit (4) extends to the surface of the outer ring part body (33).

5. The novel motor end cap of claim 3, wherein: the height of the highest position of the heat dissipation ribs (42) is H, the distance between every two adjacent heat dissipation ribs (42) is L1, and then L1=2/3H.

6. The novel motor end cap of claim 1, wherein: the end cover is characterized by further comprising a reinforcing rib (43) arranged on one side, close to the end cover seam allowance (2), of the end cover wall cavity (3), and the reinforcing rib is connected to the surfaces of the inclined portion body (32) and the outer ring portion body (33).

7. The novel motor end cap of claim 1, wherein: the inner ring part body (31) and the outer ring part body (33) are arranged in parallel, and the inner ring part body (31) and the outer ring part body (33) both extend along the radial direction; the cross section of the end cover wall cavity (3) is Z-shaped.

8. The novel motor end cap of claim 1, wherein: and the axial length of the bearing chamber (1) is L, and the distance between the inner ring part body (31) and the end surface of the bearing chamber (1) far away from the end cover spigot (2) is at least 2/3L.

9. The novel motor end cap of claim 6, wherein: the inner wall of the end cover spigot (2) is connected with the reinforcing rib (43); the end face of the end cover spigot (2) is provided with a connecting part (21) which is annular, the axial length is 3-7mm, and the radial thickness is 3-5mm.

10. An electric machine comprising a machine body and a novel machine end cap as claimed in any one of claims 1 to 9.

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