CN219124032U - Heat radiation structure and brushless motor using same - Google Patents

Abstract

The utility model discloses a heat radiation structure and a brushless motor using the heat radiation structure, comprising: the cooling device comprises an inner shell, an outer shell sleeved on the outer layer of the inner shell, and a cooling liquid channel formed on the outer wall of the inner shell and extending in a spiral manner; wherein the inner wall of the outer shell is in sealing fit with the outer wall of the inner shell; the inner shell is a cylinder with one end being formed with an opening and the other end being a closed end, and the closed end is provided with a bearing seat; the closed end is also provided with a liquid discharge hole communicated with the cooling liquid channel; the outer shell is provided with a liquid inlet hole communicated with the cooling liquid channel. The utility model can effectively accelerate the heat dissipation efficiency generated in the running process of the motor.

Description

Heat dissipation structure and brushless motor using the heat dissipation structure

technical field

The utility model relates to the technical field of motors, in particular to a heat dissipation structure and a brushless motor using the heat dissipation structure.

Background technique

For a high-speed motor with a rotating speed of 10000r/min, different losses will occur due to mechanical structure or material factors during its operation, and iron loss is one of the common energy losses in the motor. Eddy current, when the eddy current passes through the iron core, heat energy will be generated inside the iron core. This heat energy consumes energy, so it is called iron loss.

Specifically, take a motor with 12 slots and 2 poles as an example, according to the formula n=60f/p. Among them, n in the formula is the speed of the motor (rev/min); 60 is per minute (second); f is the frequency of the power supply (Hz); p is the number of pole pairs of the motor's rotating magnetic field, from which the motor can be calculated Frequency up to 2500Hz. In the case of using 20SW1200 brand stator and rotor iron core, under the magnetic induction intensity of 1T, when the motor frequency is as high as 2500Hz, the iron loss power is about a hundred times that of 50Hz. At the same time, when a large current flows through the copper wire coil, the coil will also generate heat loss, which is called copper loss.

In addition, in the motor, due to the performance of the bearing, it will also cause a certain mechanical loss. A single item of these losses will cause huge heat generation, and the combination of the heat generated by the three losses will cause a relatively large temperature rise of the motor, greatly shorten the rated life of the winding and cause irreversible demagnetization of the permanent magnet. harm. However, the heat dissipation structure generally used in the motor in the prior art often ignores the problem of heat generated during the use of the above-mentioned bearing parts. This means that the overall motor heat dissipation performance still has certain defects.

Utility model content

The first purpose of the utility model is to provide a heat dissipation structure to solve the technical problem of optimizing the heat dissipation performance of the heat dissipation structure.

The second purpose of the utility model is to provide a motor to solve the technical problem of effectively speeding up the heat dissipation efficiency generated during the operation of the motor.

The heat dissipation structure of the present utility model is realized in this way:

A heat dissipation structure, comprising: an inner casing, an outer casing sheathed on the outer layer of the inner casing, and a spirally extending coolant channel formed on the outer wall of the inner casing; wherein

The inner wall of the outer casing is in sealing fit with the outer wall of the inner casing;

The inner casing is a cylindrical body formed with an opening at one end and a closed end at the other end, wherein a bearing seat is provided on the closed end; and

The closed end is also provided with a drain hole communicating with the cooling liquid channel;

The outer casing is provided with a liquid inlet hole communicating with the cooling liquid passage.

In an optional embodiment of the present utility model, a plurality of cooling ribs are arranged on the outer wall of the outer casing.

In an optional embodiment of the present invention, a plurality of cooling ribs are arranged at intervals along the circumferential direction of the outer casing; and

Each cooling rib extends along the length direction of the outer casing.

In an optional embodiment of the present invention, both the outer casing and the inner casing are cylindrical structures; and

Both axial ends of the outer casing are open.

In an optional embodiment of the present invention, the axial length of the inner casing is smaller than the axial length of the outer casing; and

The shaft end of the outer casing facing away from the bearing seat protrudes from the shaft end of the inner casing facing away from the bearing seat.

In an optional embodiment of the present invention, the shaft end of the outer casing facing away from the bearing housing is fitted with an end cover; and

The end cover has an insertion portion adapted to be inserted into the outer casing.

In an optional embodiment of the utility model, the insertion part is connected and fixed to the shaft end of the inner casing facing away from the bearing seat through a plurality of fasteners.

In an optional embodiment of the present invention, the inner wall surface of the outer casing is a smooth surface; and the two shaft ends of the mating contact surface formed by the outer casing and the inner casing are provided with sealant.

In an optional embodiment of the present utility model, an outlet hole is also provided on the closed end of the inner casing.

The brushless motor of the present utility model is realized like this:

A motor, comprising: the heat dissipation structure.

Adopting the above-mentioned technical scheme, the utility model has the following beneficial effects: the heat dissipation structure of the utility model and the brushless motor using the heat dissipation structure first pass through the spirally extending coolant channel formed on the outer wall of the inner casing, To realize the cooling effect on the heat of the iron core and coil during operation. Secondly, through the closed end formed on one shaft end of the inner casing, and a bearing seat is provided on the closed end, under such a structure, for the inner casing with an integrated structure, the inner casing is connected by the cooling liquid channel While cooling down, the closed end of the inner casing can be cooled together, so as to realize the cooling effect on the bearing seat.

In addition, the heat dissipation ribs provided on the outer casing can cooperate with the coolant channel to achieve a heat dissipation effect on the overall brushless motor and accelerate heat dissipation efficiency.

Description of drawings

Fig. 1 is a schematic diagram of an exploded structure of a brushless motor in an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a first viewing angle of a brushless motor in an implementation of the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of a brushless motor in an embodiment of the present invention;

Fig. 4 is a first view structural diagram of the inner casing of the brushless motor in an embodiment of the present invention;

Fig. 5 is a schematic structural view of the outer casing of the brushless motor in an implementation of the present invention;

Fig. 6 is a structural schematic diagram of a second viewing angle of the inner casing of the brushless motor in an implementation of the present invention.

In the figure: outer casing 1, inner casing 2, drain joint 3, liquid inlet joint 4, cooling rib 5, bearing seat 7, liquid inlet 8, drain hole 10, bearing 11, outlet hole 12, end cover 13. Insertion part 14, screw 15, coolant channel 16.

Detailed ways

In order to make the content of the utility model more clearly understood, the utility model will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

Example 1:

Please refer to Fig. 1 to Fig. 6, this embodiment provides a heat dissipation structure, which is applicable to brushless motors, and the specific heat dissipation structure includes: an inner casing 2, an outer casing set on the outer layer of the inner casing 2 Shell 1, and the cooling liquid passage 16 extending in a spiral shape formed on the outer wall of the inner casing 2; wherein the inner wall of the outer casing 1 is in sealing fit with the outer wall of the inner casing 2 so that the cooling liquid in the cooling liquid passage 16 can Smooth circulation along the coolant channel 16. The rapid circulation of the coolant can ensure that the temperature of the coolant will not rise too fast, and the combined effect of high frequency and low temperature can ensure the effect of cooling the motor.

More specifically, the inner casing 2 is a cylindrical body with an opening formed at one end and a closed end at the other end, wherein a bearing seat 7 is provided on the closed end, and the bearing seat 7 is used for fitting the bearing 11 . The closed end of the inner casing 2 is provided with an outlet hole 12 . Here, the outer casing 1 can be fitted on the outside of the inner casing 2 through, for example but not limited to, a shrink-fit process, so that a good sealing effect is formed between the outer casing 1 and the inner casing 2 . Here, a closed end formed by an axial end of the inner casing 2 is provided, and a bearing seat 7 is provided on the closed end. While cooling the inner casing 2 , the closed end of the inner casing 2 can be cooled simultaneously, so as to realize the cooling effect on the bearing seat 7 .

Furthermore, the closed end of the inner casing is also provided with a drain hole 10 communicating with the cooling liquid passage 16, where the drain hole 10 is provided with a drain joint 3; The liquid inlet hole of the channel 16 is equipped with a liquid inlet joint 4 here. Here, the drain holes 10 are arranged on the inner casing 2. On the one hand, the characteristic of water flowing down can be used to speed up the flow rate of the liquid in the cooling liquid passage 16. On the other hand, it can avoid the problem that the liquid discharge connector 3 and the liquid inlet connector 4 are easily collided and damaged when both are arranged on the outer casing 1 .

It should be noted that the minimum distance from the outer peripheral surface of the drain hole 10 to the outer peripheral surface of the bearing 11 assembled in the bearing seat 7 in this embodiment is between 3/5 and 2/3 of the radius of the inner casing 2, In this way, the drain hole 10 is arranged in a flat position, compared with the curved surface position where the water outlet is on the outer peripheral surface of the outer casing 1, it is easier to realize the sealing of the drain hole 10, reducing the risk of water leakage from the drain hole 10, and the drain The hole 10 is closer to the bearing 11, which improves the heat dissipation capacity of the end surface of the inner casing 2 and the bearing seat 7, thereby prolonging the service life of the bearing 11.

That is to say, for the coolant channel 16 here, the cooling effect is realized through the cooperation of the outer casing 1 and the inner casing 2. For this, the inner wall surface of the outer casing 1 in this embodiment is smooth surface; and the two axial ends of the mating contact surface formed by the outer casing 1 and the inner casing 2 are provided with sealant, so that the inner casing 2 and the outer casing 1 form a sealed state, ensuring the cooling liquid channel 16 Complete sealing, so that the coolant in the coolant channel 16 can only enter from the liquid inlet hole and be discharged from the liquid discharge hole 10, and there will be no other overflow directions that will affect the stability and safety of the operating system in the motor .

Next, in conjunction with the accompanying drawings, an example of an optional implementation is given. Both the outer casing 1 and the inner casing 2 in this embodiment are cylindrical structures; and both ends of the outer casing 1 in the axial direction are open. mouth.

Based on the above structure, furthermore, the axial length of the inner casing 2 is smaller than the axial length of the outer casing 1; The shaft end of seat 7. Such a design is for the convenience of assembling the end cover 13 . Specifically, the shaft end of the outer casing 1 facing away from the bearing seat 7 is fitted with an end cover 13 ; and the end cover 13 has an insertion portion 14 suitable for being inserted into the outer casing 1 . Here, inserting the insertion part 14 into the outer casing 1 can effectively increase the contact area between the end cover 13 and the outer casing 1 , so that the excellent heat dissipation effect of the outer casing 1 can be used to simultaneously realize accelerated heat dissipation of the end cover 13 .

On the basis of the above structure, in an optional implementation, the insertion part 14 is connected and fixed to the axial end of the inner casing 2 facing away from the bearing seat 7 through a plurality of fasteners such as but not limited to screws 15 .

In addition, for the purpose of further improving the heat dissipation efficiency, a plurality of heat dissipation ribs 5 are provided on the outer wall of the outer casing 1 adopted in this embodiment. Here, a plurality of cooling ribs 5 are arranged at intervals along the circumferential direction of the outer casing 1 ; and each cooling rib 5 extends along the length direction of the outer casing 1 .

Based on the above situation, in a preferred manner, a plurality of heat dissipation ribs 5 are evenly distributed along the circumferential direction of the outer casing 1, so that the angles of the corresponding central angles between every two adjacent heat dissipation ribs 5 are the same, of course. Considering the arrangement of the liquid inlet 8 between a pair of heat dissipation ribs 5, an included angle different from that of other adjacent heat dissipation ribs 5 can be formed. In an optional situation here, except for the case of two adjacent heat dissipation ribs 5, the angles of the circular corners corresponding to the other two adjacent heat dissipation ribs 5 are both 20°. For such a structure of heat dissipation ribs 5, Effectively guarantee its cooling effect.

For the heat dissipation rib 5 used in this embodiment, it can be a regular shape, such as a rectangular or arc-shaped structure in cross-section, or a special-shaped structure, which is not absolutely limited in this embodiment.

In this embodiment, a plurality of heat dissipation ribs 5 are provided on the outer wall of the outer casing 1, so that the overall outer casing 1 forms a radiating cold row structure, which can effectively absorb the cooling liquid channel 16 into the inside of the motor. The heat is transferred to the heat dissipation ribs 5 of the outer casing 1, and then radiated and transferred to the environment, so as to realize the function of efficient heat conduction and cooling for the motor as a whole.

Finally, it is necessary to explain that the three parts of the inner casing 2, the outer casing 1, and the end cover 13 in this embodiment can all be made of aluminum to ensure that its excellent thermal conductivity can efficiently take away the motor. internal heat. Moreover, the material of aluminum is convenient for one-piece die-casting to form the special shape required on the inner casing 2, which is helpful for the formation of the spiral cooling liquid channel 16.

To sum up, for the heat dissipation structure of this embodiment, not only the problem of heat loss during operation of the iron core and coil is considered, but also the problem of heat loss in the bearing installation environment is taken into account, so that the heat dissipation effect of the overall heat dissipation structure and The heat dissipation efficiency has been improved.

Example 2:

Referring to FIG. 1 to FIG. 6 , on the basis of the heat dissipation structure of the first embodiment, this embodiment provides a brushless motor, including: the heat dissipation structure of the first embodiment.

The above specific embodiments have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. It should be understood that the above are only specific embodiments of the present utility model, and are not intended to limit the present utility model. Within the spirit and principles of the present utility model, any modification, equivalent replacement, improvement, etc. should be included in the protection scope of the present utility model.

In the description of the utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the Means that a device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention.

In this utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the utility model is used. It is only for the convenience of describing the utility model and simplifying the description, rather than Any indication or implication that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the present invention, unless otherwise specified and limited, the first feature above or below the second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact. Rather, through additional characteristic contact between them. Moreover, the first feature on, above and above the second feature includes the first feature directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature being below, below and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Claims (10)

1. A heat dissipation structure, characterized in that it comprises: an inner casing, an outer casing sheathed on the outer layer of the inner casing, and a spirally extending coolant channel formed on the outer wall of the inner casing; wherein The inner wall of the outer casing is in sealing fit with the outer wall of the inner casing; The inner casing is a cylindrical body formed with an opening at one end and a closed end at the other end, wherein a bearing seat is provided on the closed end; and The closed end is also provided with a drain hole communicating with the cooling liquid channel; The outer casing is provided with a liquid inlet hole communicating with the cooling liquid passage. 2. The heat dissipation structure according to claim 1, wherein a plurality of heat dissipation ribs are arranged on the outer wall of the outer casing. 3. The heat dissipation structure according to claim 2, wherein a plurality of heat dissipation ribs are arranged at intervals along the circumferential direction of the outer casing; and Each cooling rib extends along the length direction of the outer casing. 4. The heat dissipation structure according to claim 1, wherein both the outer casing and the inner casing are cylindrical structures; and Both axial ends of the outer casing are open. 5. The heat dissipation structure according to claim 4, wherein the axial length of the inner casing is smaller than the axial length of the outer casing; and The shaft end of the outer casing facing away from the bearing seat protrudes from the shaft end of the inner casing facing away from the bearing seat. 6. The heat dissipation structure according to claim 5, wherein the shaft end of the outer casing facing away from the bearing seat is fitted with an end cover; and The end cover has an insertion portion adapted to be inserted into the outer casing. 7 . The heat dissipation structure according to claim 6 , wherein the insertion part is connected and fixed to the shaft end of the inner casing facing away from the bearing seat through a plurality of fasteners. 8 . 8. The heat dissipation structure according to any one of claims 4-7, wherein the inner wall surface of the outer casing is a smooth surface; and Sealant is provided at both shaft ends of the mating contact surface formed by the outer casing and the inner casing. 9 . The heat dissipation structure according to claim 1 , wherein an outlet hole is further provided on the closed end of the inner casing. 10 . 10. A brushless motor, characterized by comprising: the heat dissipation structure according to any one of claims 1-9.

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