Motor with good heat dissipation and knife sharpener provided with motor

Abstract

The utility model provides a motor with good heat dissipation, which comprises a shell, a stator, a rotor and a motor shaft, the shell is provided with an air inlet and an air outlet which penetrate through the shell, the motor shaft penetrates through the rear end of the shell or is coaxially connected with a mounting shaft in a transmission manner, and fan blades are mounted on the motor shaft protruding out of the shell or the mounting shaft. The shell is connected with a fan cover which leads air generated by the fan blades into the shell, the air inlet is located within the range covered by the fan cover, and the air outlet is located outside the range of the fan cover. The beneficial effects of the utility model are that the fan cover is covered outside the motor, and wind is introduced into the motor through the fan cover and the fan blades, so that the high-speed flowing air directly radiates heat of the rotor and the stator in the motor, the heat radiation effect is good, and the service life of the motor is long.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and knife sharpeners, in particular to a small mini electric knife sharpener. Background Art

[0002] Traditional mini electric knife sharpeners use motors to drive the sanding belt to sharpen knives. Since the motor is in a high-speed running state for a long time, it is easy to cause the motor to heat up and burn out. The current technical means is to set a vent on the motor housing and connect a fan blade to the motor shaft inside the housing. Since the knife sharpener is mini, it has strict requirements on the motor size. Therefore, the limited motor size makes the size of the fan blade subject to greater restrictions, resulting in unsatisfactory heat dissipation in the motor, which will also cause the motor to heat up quickly and reduce the service life of the motor. In addition, if the size of the motor is increased, the cost will be greatly increased. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to improve the heat dissipation performance of the motor.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A motor with good heat dissipation comprises a shell, a stator, a rotor and a motor shaft. The shell is provided with an air inlet and an air outlet which are arranged through the shell. The rear end of the motor shaft passes through the shell or a mounting shaft is coaxially connected to the motor shaft. Fan blades are installed on the motor shaft or the mounting shaft which protrudes out of the shell. A wind shield which guides wind generated by the fan blades into the shell is connected to the shell. The air inlet is within the range covered by the wind shield, and the air outlet is outside the range of the wind shield.

[0006] Preferably, the wind shield is fixed to the outside of the shell, one end of the wind shield has a large opening and the other end has a small opening, and the end with the small opening is sleeved on the shell.

[0007] Preferably, the end of the wind hood with a smaller opening has an "L"-shaped groove, and the "L"-shaped groove is opened at the end of the wind hood, so that one side of the "L"-shaped groove is a fixed part and the other side of the "L"-shaped groove is a movable part, and mounting parts are provided on the fixed part and the movable part, and the mounting part of the fixed part and the mounting part of the movable part are connected by fasteners.

[0008] Preferably, an annular reinforcing rib is provided on the outer wall of the end of the wind shield with a smaller opening.

[0009] Preferably, a vertically arranged mounting portion is provided on the main frame, the mounting portion and the main frame are an integral structure, the mounting portion is formed by bending on the main frame, and the motor and the sharpening assembly are installed on the mounting portion.

[0010] Preferably, a through groove is provided at the bent mounting portion of the main frame, and a heat dissipation plate with heat dissipation holes is installed at the through groove.

[0011] The beneficial effect of the utility model is that the utility model arranges a wind cover on the outside of the motor, introduces wind into the motor through the wind cover and the fan blades, so that the high-speed flowing air directly dissipates the heat to the rotor and the stator in the motor, the heat dissipation effect is good, and the service life of the motor is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the wind hood;

[0013] Figure 2 It is a schematic diagram of the overall structure of the embodiment;

[0014] Figure 3 A top view of an embodiment;

[0015] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0016] Figure 5 It is a structural schematic diagram of the main frame in the embodiment;

[0017] Figure 6 For three-dimensional motor with fan cover Figure 1 ;

[0018] Figure 7 For three-dimensional motor with fan cover Figure 2 . DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example

[0021] See also Figure 1-Figure 7, as shown in the figure, is a knife sharpener, comprising a main frame 1, a main shell 2, a knife sharpening assembly 3 and a motor 4. The knife sharpening assembly is a prior art and has nothing to do with the technical problem to be solved by the present application, so its specific structure is not elaborated in detail here. It is worth noting that the motor 4 comprises a shell 41, a stator, a rotor 42, and a motor shaft 43. The shell 41 is provided with an air inlet 411 and an air outlet 412 which are arranged through the shell 41. The motor shaft 43 is arranged through the rear end of the shell 41 or is coaxially connected with a mounting shaft on the motor shaft 43, and a fan blade 44 is installed on the motor shaft 43 or the mounting shaft protruding from the shell 41. A wind hood 45 is connected to the shell 41 to introduce the wind generated by the fan blade 44 into the interior of the shell 41, and the air inlet 411 is within the range covered by the wind hood 45, and the air outlet 412 is outside the range of the wind hood 45. The sharpening assembly 3 is connected to the motor shaft 43 by transmission. The bottom of the main frame 1 is provided with a heat dissipation port 11. An air duct is provided between the air outlet 412 of the housing 41 of the motor 4 and the heat dissipation port 11 of the main frame 1. A wind shield is provided outside the motor 4, and wind is introduced into the motor 4 through the wind shield and the fan blades 44, so that the high-speed flowing air directly dissipates the heat of the rotor 42 and the stator in the motor 4, and the heat dissipation effect is good, and the motor 4 has a long service life.

[0022] The wind hood 45 is fixed to the outside of the outer shell 41. One end of the wind hood 45 has a large opening and the other end has a small opening. The end with the small opening is sleeved on the outer shell 41. The wind hood 45 has a conical structure at least partially to form an inclined guide surface during the wind suction process to avoid wind resistance caused by direct collision.

[0023] In order to facilitate and quickly install the wind hood 45 on the housing 41 of the motor 4, the present embodiment has an "L"-shaped groove 451 at the end with a small opening of the wind hood 45, and the "L"-shaped groove is opened at the end of the wind hood 45, so that one side of the "L"-shaped groove 451 is a fixed part 452, and the other side of the "L"-shaped groove 451 is a movable part 453, and mounting parts 454 are provided on the fixed part 452 and the movable part 453, and the mounting part 454 of the fixed part 452 and the mounting part 454 of the movable part 453 are connected by fasteners (not shown in the figure), and the fasteners are bolts or screws. Due to the setting of the "L"-shaped groove, the movable part 453 has good flexibility, and then the two mounting parts 454 between the fixed part 452 and the movable part 453 are fixed by fasteners. When the fasteners are loosened, the diameter of the wind hood 45 will be slightly larger than the motor 4 housing 41, and the wind hood 45 can be easily put on the motor 4 housing 41. After the wind hood 45 is put on the motor 4 housing 41, the fasteners are screwed, and the movable part 453 is tightened to make the entire wind hood 45 firmly fixed on the motor 4 housing 41, so as to achieve quick assembly. The wind hood 45 is preferably made of PE material, but other materials can also be used. In order to strengthen the strength of the wind hood 45, in this embodiment, the outer wall of the end with a small opening of the wind hood 45 is provided with an annular reinforcement rib, and one or more reinforcement ribs can be provided, all of which are within the protection scope of this application.

[0024] The air outlet 412 of the shell 41 is arranged on the end face of the output end of the motor shaft 43 of the shell 41, and the end face of the motor 4 is installed close to the main housing 2, and a groove 12 is arranged on the end face of the main frame 1 close to the shell 41 of the motor 4, a part of the groove 12 is communicated with the air outlet 412 of the shell 41 of the motor 4, and a part of the groove 12 is communicated with the heat dissipation port 11 of the main frame 1 to form an air duct, and the groove can be a blocked groove or a through groove. When it is a through groove, it is necessary to cooperate with other parts of the sharpening assembly to block the groove outside, and of course, it is also possible to directly dissipate heat from the place without blocking the place. The air outlet 412 of the shell 41 is arranged on the end face of the output end of the motor shaft 43 of the shell 41 so that the cold air can pass through the inside of the motor 4, and the entire inside of the motor 4 can be cooled, thereby improving the cooling effect.

[0025] The main shell 2 is fixedly connected to the main frame 1, and an air suction groove 21 is provided on one side of the main shell 2, which is communicated with the end with a larger opening of the wind hood 45, and the end with a larger opening of the wind hood 45 is arranged in contact with the main shell 2. The air suction port and the air exhaust port of the entire sharpener are not on the same plane, so as to avoid the hot air that has been dissipated from the heat being sucked into the motor 4, ensure that the inhaled air is cold air, and further ensure the heat dissipation effect. The opening of the wind hood 45 abuts against the main shell 2 to ensure that the gap between them is small or there is no gap, further ensuring that hot air will not be sucked in. In this embodiment, in order to improve the processing efficiency, this embodiment provides a vertically arranged mounting portion on the main frame, and the mounting portion and the main frame are arranged in an integrated structure. The main frame is a flat plate, and then a mounting portion 13 is stamped and bent in the middle position, so that the mounting portion and the main frame are an integrated structure, and there is no need to install other fasteners, which improves the assembly efficiency and also increases the strength of the product. The motor and the sharpening assembly are installed on the mounting portion. Since the bending setting of the installation part will leave a through groove 14 on the main frame, in order to prevent foreign objects from being easily inserted into the product and causing damage to internal parts, this embodiment installs a heat sink with heat dissipation holes at the through groove. The heat sink can not only prevent the invasion of foreign objects, but also play a good heat dissipation role.

Claims

1. A motor with good heat dissipation, comprising a housing, a stator, a rotor, and a motor shaft, wherein the housing is provided with an air inlet and an air outlet which penetrate the housing, and wherein: The motor shaft passes through the rear end of the shell or is coaxially connected to the motor shaft with a mounting shaft, and fan blades are installed on the motor shaft or the mounting shaft protruding from the shell. A wind hood is connected to the shell to introduce wind generated by the fan blades into the shell, and the air inlet is within the range covered by the wind hood, and the air outlet is outside the range of the wind hood.

2. A motor with good heat dissipation as claimed in claim 1, characterized in that: The wind shield is fixed on the outside of the shell, one end of the wind shield has a large opening and the other end has a small opening, and the end with the small opening is sleeved on the shell.

3. A motor with good heat dissipation as claimed in claim 1, characterized in that: The end of the wind shield with a small opening has an "L"-shaped groove, and the "L"-shaped groove is opened at the end of the wind shield, so that one side of the "L"-shaped groove is a fixed part and the other side of the "L"-shaped groove is a movable part. Both the fixed part and the movable part are provided with mounting parts, and the mounting part of the fixed part and the mounting part of the movable part are connected by fasteners.

4. A motor with good heat dissipation as claimed in claim 2 or 3, characterized in that: The outer wall of the end of the wind shield with a smaller opening is provided with an annular reinforcing rib.

5. A knife sharpener, comprising a main frame, a main housing, and a knife sharpening assembly, characterized in that: The knife sharpener is equipped with a motor with good heat dissipation as described in any one of claims 1-4, the knife sharpening assembly is transmission-connected to the motor shaft, a heat dissipation port is provided at the bottom of the main frame, and an air duct is provided between the air outlet of the motor housing and the heat dissipation port of the main frame.

6. The knife sharpener according to claim 5, characterized in that: The air outlet of the shell is arranged on the end face of the output end of the shell motor shaft, and the end face of the motor is installed close to the main shell, and a groove is provided on the end face of the main frame close to the motor shell. A part of the groove is communicated with the air outlet of the motor shell, and a part of the groove is communicated with the heat dissipation port of the main frame to form an air duct.

7. The knife sharpener according to claim 6, characterized in that: The main shell is fixedly connected to the main frame, and an air suction groove communicating with the end of the wind cover with a larger opening is provided on one side of the main shell, and the end of the wind cover with a larger opening is abutted against the main shell.

8. The knife sharpener according to claim 5, 6 or 7, characterized in that: A vertically arranged mounting portion is arranged on the main frame. The mounting portion and the main frame are an integrated structure. The mounting portion is formed by bending on the main frame, and the motor and the sharpening assembly are mounted on the mounting portion.

9. The knife sharpener according to claim 8, characterized in that: A through slot is provided at the bent mounting portion of the main frame, and a heat dissipation plate with heat dissipation holes is installed at the through slot.

Images