Motor

Abstract

The utility model provides a motor, and belongs to the technical field of motors. The problem that an existing motor is poor in heat dissipation is solved. The motor comprises a front end cover with a center hole, a barrel-shaped casing and a rotating shaft horizontally fixed in the casing, the front end of the rotating shaft penetrates through the center hole, a positioning pipe is horizontally arranged in the casing, the rotating shaft is sleeved with the positioning pipe, the positioning pipe and the rotating shaft are connected through a bearing, the front end of the positioning pipe is fixedly connected with the front end cover, and a stator assembly is fixed on the outer wall of the positioning pipe. A circle of magnetic steel is fixed on the inner wall of the casing, a baffle ring is integrally formed on the front end face of the casing, and the baffle ring is inserted into the rear end of the front end cover and is in clearance fit with the front end cover. A circle of air inlets penetrate through the side wall of the front end of the front end cover, a circle of air outlets penetrate through the side wall of the rear end of the machine shell, and fan blades pushing air towards the air outlets are formed on the inner side of the rear end face of the machine shell. The motor is good in heat dissipation.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a motor. Background Art

[0002] An electric motor is a device that converts electrical energy into mechanical energy. Its working principle is based on the phenomenon of electromagnetic induction, that is, an energized coil is forced to rotate in a magnetic field.

[0003] Existing electric motors, such as an outer rotor motor disclosed in the Chinese Patent Library (application number: 202210744514.2), include an axially extending shaft, an inner stator sleeved on the outer periphery of the shaft, an outer rotor and a fan fixed on the shaft, wherein the inner stator is located between the shaft and the outer rotor, and the fan rotates with the shaft to generate airflow; the fan has a hub driven by the shaft and a plurality of blades radially protruding outward from the outer peripheral surface of the hub, and the diameter d of the hub is equal to the diameter of the outer rotor. The ratio of the diameter D of the fan is less than or equal to 0.6; the outer rotor is provided with an annular side wall and an end wall located at one axial end of the annular side wall, the annular side wall and the end wall are arranged to form the accommodating cavity, the inner stator is accommodated in the accommodating cavity, and the fan is arranged adjacent to the end wall; the end wall is fixed on the rotating shaft and is provided with an air inlet connected to the accommodating cavity, the fan is arranged adjacent to the air inlet, and the ratio of the total air inlet area S1 of the air inlet to the circumferential area S2 of the end wall is greater than or equal to 0.7.

[0004] In the above motor, the air inlet is arranged on the outer rotor, and when in use, the outer rotor rotates at a high speed, which easily causes air flow turbulence, reduces air intake efficiency, and thus affects the heat dissipation of the motor. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a motor with good heat dissipation effect.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an electric motor, comprising a front end cover with a center hole, a barrel-shaped casing and a rotating shaft fixed horizontally in the casing, the front end of the rotating shaft passes through the center hole, and a positioning tube is also horizontally arranged in the casing, the positioning tube is sleeved on the rotating shaft and the two are connected by a bearing, the front end of the positioning tube is fixedly connected to the above-mentioned front end cover, a stator assembly is fixed on the outer wall of the positioning tube, and a circle of magnetic steel is fixed on the inner wall of the casing, characterized in that a retaining ring coaxial with the casing is integrally formed on the front end surface of the casing, the retaining ring is inserted into the rear end of the front end cover and the two are gap-matched; a circle of air inlets is penetrated on the front end side wall of the front end cover, a circle of exhaust ports is penetrated on the rear end side wall of the casing, and a fan blade coaxial with the casing and pushing the gas toward the exhaust port is formed on the inner side of the rear end surface of the casing.

[0007] When the motor is running, the casing rotates at high speed to form a negative pressure inside the casing. External air is drawn in through the air inlet and flows through the stator assembly to quickly take away the heat on the stator assembly. The air is finally thrown out through the exhaust port under the action of the fan blades.

[0008] The air inlet is arranged on the front cover in a fixed state, and the front port of the casing is arranged opposite to the inner cavity of the front cover, so that the external air can be stably and quickly drawn into the casing, and the air entering the casing is quickly thrown out through the exhaust port under the action of the fan blades, so that the gas can flow efficiently in the casing, thereby quickly taking away the heat on the stator assembly, thereby greatly improving the working stability and life of the motor.

[0009] In the above-mentioned motor, the above-mentioned fan blades are composed of a cylindrical base and a circle of blades formed on the inner side of the rear end surface of the casing. The length of the blades extends along the radial direction of the casing, and the two ends of the blades extend to the outer side surface of the base and the inner side surface of the casing respectively; the rear end of the rotating shaft is inserted into the base and the two are fixedly connected, and an exhaust channel is formed between two adjacent blades. The exhaust port and the exhaust channel are the same in number and their positions are opposite to each other, so that the gas in the casing can be thrown out through the exhaust port faster, so that the heat dissipation of the motor is better.

[0010] In the above-mentioned motor, there are at least two bearings distributed axially along the rotating shaft, and the rear end face of the inner ring of the rearmost bearing is pressed against the front end face of the base, so that the base also plays the axial limiting function of the bearing, thereby simplifying the structure and facilitating assembly.

[0011] In the above-mentioned motor, a cylindrical filter screen whose shape and size match the inner cavity of the front end cover is inserted and fixed in the front end cover, and the air inlet is arranged opposite to the cylindrical filter screen to prevent large particles of impurities from entering through the air inlet, ensuring that the inside of the casing always maintains good heat dissipation.

[0012] In the above-mentioned motor, the front end of the positioning tube is detachably connected to the front end cover, and the cylindrical filter is clamped and positioned in the front end cover, so that after removing the positioning tube, the cylindrical filter can be pulled out forcefully for cleaning or replacement, which is convenient for subsequent maintenance.

[0013] In the above-mentioned motor, a ring-shaped limit seat is formed on the front outer wall of the positioning tube, the front end of the limit seat is pressed on the front cover and the two are fixedly connected by a circle of screws, the axis of the screw extends along the axis of the shaft, and the head of the screw is outside the front cover. The above design makes it easy to separate the positioning tube from the front cover.

[0014] In the above-mentioned motor, a support ring is provided on the rear side of the cylindrical filter, and the support ring is sleeved on the positioning tube. The cylindrical filter is pressed on the front end surface of the support ring and the two are fixedly connected. The inner diameter of the cylindrical filter is larger than the inner diameter of the support ring to increase the operating area and make the cylindrical filter easier to insert or pull out.

[0015] In the above-mentioned motor, a circle of pull rods is vertically fixed on the rear end surface of the support ring to provide a more convenient holding point for inserting or pulling out the cylindrical filter.

[0016] In the above motor, the stator assembly includes a winding lead wire, and the cylindrical filter screen is provided with a through hole for the winding lead wire to pass through. The above design can maximize the air inlet area, increase the air intake volume, and make the motor heat dissipation stronger.

[0017] In the above-mentioned motor, a guide ring coaxial with the positioning tube is formed on the front end surface of the positioning tube. The shape and size of the guide ring match the above-mentioned center hole, and the guide ring is inserted into the center hole to guide the connection between the positioning tube and the front end cover for easy assembly.

[0018] Compared with the prior art, this motor has the following advantages:

[0019] 1. The air inlet is set on the front cover in a fixed state, and the front port of the casing is set opposite to the inner cavity of the front cover, so that the external gas can be stably and quickly drawn into the casing, and the gas entering the casing is quickly thrown out through the exhaust port under the action of the fan blades, so that the gas flows efficiently in the casing, thereby quickly taking away the heat on the stator assembly, so as to greatly improve the working stability and life of the motor.

[0020] 2. The front end of the positioning tube is detachably connected to the front end cover, and the cylindrical filter is clamped and positioned in the front end cover. In this way, after removing the positioning tube, the cylindrical filter can be pulled out forcefully for cleaning or replacement, which is convenient for subsequent maintenance.

[0021] 3. With the cooperation of the support ring and the pull rod, a more convenient holding point is provided for the insertion or removal of the cylindrical filter, which is convenient for the insertion of the cylindrical filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of an electric motor.

[0023] Figure 2 It is a cross-sectional schematic diagram of the motor.

[0024] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0025] Figure 4 It is a three-dimensional schematic diagram of the casing.

[0026] In the figure, 1, front cover; 1a, air inlet; 2, casing; 2a, baffle ring; 2b, exhaust port; 2c, fan blade; 2c1, base; 2c2, blade; 3, rotating shaft; 4, positioning tube; 4a, limit seat; 4b, guide ring; 5, bearing; 6, stator assembly; 6a, winding lead wire; 7, magnet; 8, cylindrical filter; 9, screw; 10, support ring; 11, pull rod. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0028] like Figure 1 and Figure 2 As shown, the motor comprises a front end cover 1 with a center hole, a barrel-shaped casing 2 and a rotating shaft 3 horizontally fixed in the casing 2, and the rotating shaft 3, the front end cover 1 and the casing 2 are coaxially arranged.

[0029] in,

[0030] The front end of the rotating shaft 3 passes through the center hole, and a positioning tube 4 is also horizontally arranged in the housing 2. The positioning tube 4 is sleeved on the rotating shaft 3 and the two are connected by a bearing 5. The front end of the positioning tube 4 extends out of the housing 2 and is fixedly connected to the front cover 1. A stator assembly 6 is fixed on the outer wall of the positioning tube 4, and the stator assembly 6 is an existing structure and will not be described in detail here. A circle of magnetic steel 7 is fixed on the inner wall of the housing 2, and the magnetic steel 7 is arranged directly opposite the stator assembly 6.

[0031] like Figures 2 to 4 As shown, a baffle ring 2a coaxial with the housing 2 is integrally formed on the front face of the housing 2, and the baffle ring 2a is inserted into the rear end of the front cover 1 and the two are gap-matched. At this time, the baffle ring 2a and the front cover 1 are not in contact, and there is an annular gap between the outer side of the baffle ring 2a and the inner side of the front cover 1. A circle of air inlets 1a is penetrated on the front side wall of the front cover 1, and a circle of exhaust ports 2b is penetrated on the rear side wall of the housing 2, and a fan blade 2c coaxial with the housing 2 and pushing the gas toward the exhaust port 2b is formed on the inner side of the rear end face of the housing 2.

[0032] When the motor is running, the casing 2 rotates at high speed to form a negative pressure inside the casing 2, and external air is drawn in through the air inlet 1a and flows through the stator assembly 6 to quickly take away the heat on the stator assembly 6, and the air is finally thrown out through the exhaust port 2b under the action of the fan blades 2c.

[0033] The air inlet 1a is set on the front end cover 1 in a fixed state, and the front end of the casing 2 is set opposite to the inner cavity of the front end cover 1, so that the external air can be stably and quickly drawn into the casing 2, and the air entering the casing 2 is quickly thrown out through the exhaust port 2b under the action of the fan blade 2c, so that the gas can flow efficiently in the casing 2, thereby quickly taking away the heat on the stator assembly 6, so as to greatly improve the working stability and life of the motor.

[0034] In this embodiment,

[0035] like Figure 2 and Figure 4As shown, the structure of the fan blade 2c is as follows: the fan blade 2c is composed of a cylindrical base 2c1 and a circle of blades 2c2 formed on the inner side of the rear end surface of the housing 2. The base 2c1 and the housing 2 are coaxially arranged; the length of the blade 2c2 extends along the radial direction of the housing 2, and the two ends of the blade 2c2 extend to the outer side of the base 2c1 and the inner side of the housing 2 respectively. The rear end of the rotating shaft 3 is inserted into the base 2c1 and the two are fixedly connected; an exhaust channel is formed between two adjacent blades 2c2, and the exhaust port 2b and the exhaust channel are the same in number and the positions are opposite to each other, so that the gas in the housing 2 is thrown out faster through the exhaust port 2b, so that the heat dissipation of the motor is better.

[0036] Further explanation: there are at least two bearings 5 ​​and they are distributed axially along the rotating shaft 3. The type of bearing 5 is a ball bearing 5, and the rear end face of the inner ring of the rearmost bearing 5 is pressed on the front end face of the base 2c1, so that the base 2c1 also plays the axial limiting function of the bearing 5, so as to simplify the structure and facilitate assembly.

[0037] like Figure 2 and Figure 3 As shown, a cylindrical filter screen 8 whose shape and size match the inner cavity of the front end cover 1 is inserted and fixed in the front end cover 1, and the air inlet 1a is arranged opposite to the cylindrical filter screen 8 to prevent large particles of impurities from entering through the air inlet 1a, ensuring that the inside of the housing 2 always maintains good heat dissipation. Further explanation: the front end of the positioning tube 4 is detachably connected to the front end cover 1, and the cylindrical filter screen 8 is clamped and positioned in the front end cover 1, so that after removing the positioning tube 4, the cylindrical filter screen 8 can be pulled out by force for cleaning or replacement, which is convenient for subsequent maintenance.

[0038] in,

[0039] The connection method of the positioning tube 4 and the front end cover 1 is as follows: a ring-shaped limit seat 4a is formed on the front end outer wall of the positioning tube 4, the front end of the limit seat 4a is pressed on the front end cover 1 and the two are fixedly connected by a circle of screws 9, the axis of the screw 9 extends axially along the rotating shaft 3, and the head of the screw 9 is outside the front end cover 1, so that the screw 9 can be easily unscrewed to quickly separate the positioning tube 4 from the front end cover 1. Further explanation, a guide ring 4b coaxial with the positioning tube 4 is integrally formed on the front end surface of the positioning tube 4, the shape and size of the guide ring 4b match the center hole, and the guide ring 4b is inserted in the center hole, which is used for guiding the connection between the positioning tube 4 and the front end cover 1, and is convenient for assembly.

[0040] like Figure 2 and Figure 3As shown, a support ring 10 is provided at the rear side of the cylindrical filter 8, and the support ring 10 is sleeved on the positioning tube 4, the cylindrical filter 8 is pressed on the front end surface of the support ring 10 and the two are fixedly connected, and the inner diameter of the cylindrical filter 8 is larger than the inner diameter of the support ring 10 to increase the operating area and make it easier to insert or remove the cylindrical filter 8. Further explanation, a circle of pull rods 11 are vertically fixed on the rear end surface of the support ring 10 to provide a more convenient gripping point for the cylindrical filter 8 to be inserted or removed. Preferably, the support ring 10 is welded and fixedly connected to the cylindrical filter 8; the pull rod 11 is welded and fixedly connected to the support ring 10.

[0041] In the actual product, the stator assembly 6 includes a winding lead wire 6a, and a through hole is provided on the cylindrical filter screen 8 for the winding lead wire 6a to pass through. The above design can maximize the area of ​​the air inlet 1a, increase the air intake, and make the heat dissipation of the motor stronger. A clearance hole is provided on the side wall of the front cover 1 for the winding lead wire 6a to pass through. Embodiment 2

[0042] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that the front end of the positioning tube 4 is screwed into the center hole to achieve a detachable connection between the positioning tube 4 and the front end cover 1 .

[0043] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An electric motor, comprising a front end cover (1) having a center hole, a barrel-shaped housing (2) and a rotating shaft (3) fixed horizontally in the housing (2), the front end of the rotating shaft (3) passing through the center hole, a positioning tube (4) being horizontally arranged in the housing (2), the positioning tube (4) being sleeved on the rotating shaft (3) and the two being connected by a bearing (5), the front end of the positioning tube (4) being fixedly connected to the front end cover (1), a stator assembly (6) being fixed on the outer wall of the positioning tube (4), and a circle of magnetic steel (7) being fixed on the inner wall of the housing (2), characterized in that: A retaining ring (2a) coaxial with the casing (2) is integrally formed on the front end surface of the casing (2), and the retaining ring (2a) is inserted into the rear end of the front end cover (1) and the two are fitted with a gap; a circle of air inlets (1a) is formed through the front end side wall of the front end cover (1), a circle of air outlets (2b) is formed through the rear end side wall of the casing (2), and a fan blade (2c) coaxial with the casing (2) and pushing the gas toward the exhaust port (2b) is formed on the inner side of the rear end surface of the casing (2).

2. The electric motor according to claim 1, characterized in that The fan blade (2c) is composed of a cylindrical base (2c1) and a circle of blades (2c2) formed on the inner side of the rear end surface of the casing (2); the length of the blades (2c2) extends along the radial direction of the casing (2), and the two ends of the blades (2c2) extend to the outer side surface of the base (2c1) and the inner side surface of the casing (2), respectively; the rear end of the rotating shaft (3) is inserted into the base (2c1) and the two are fixedly connected, and an exhaust channel is formed between two adjacent blades (2c2); the exhaust port (2b) and the exhaust channel are the same in number and are located opposite to each other.

3. The electric motor according to claim 2, characterized in that There are at least two bearings (5) distributed axially along the rotating shaft (3), and the rear end face of the inner ring of the rearmost bearing (5) is pressed against the front end face of the base body (2c1).

4. The electric motor according to claim 1, characterized in that A cylindrical filter screen (8) having a shape and size matching the inner cavity of the front end cover (1) is inserted and fixed in the front end cover (1), and the air inlet (1a) is arranged facing the cylindrical filter screen (8).

5. The electric motor according to claim 4, characterized in that The front end of the positioning tube (4) is detachably fixedly connected to the front end cover (1), and the cylindrical filter screen (8) is clamped and positioned in the front end cover (1).

6. The electric motor according to claim 5, characterized in that An annular limiting seat (4a) is formed on the front end outer wall of the positioning tube (4), the front end of the limiting seat (4a) is pressed on the front end cover (1), and the two are fixedly connected by a circle of screws (9), the axis of the screw (9) extends axially along the rotating shaft (3), and the head of the screw (9) is located outside the front end cover (1).

7. The electric motor according to claim 5 or 6, characterized in that: A support ring (10) is provided at the rear side of the cylindrical filter screen (8), and the support ring (10) is sleeved on the positioning tube (4). The cylindrical filter screen (8) is pressed onto the front end surface of the support ring (10) and the two are fixedly connected. The inner diameter of the cylindrical filter screen (8) is larger than the inner diameter of the support ring (10).

8. The electric motor according to claim 7, characterized in that A pull rod (11) is vertically fixed on the rear end surface of the support ring (10).

9. The electric motor according to claim 4, characterized in that The stator assembly (6) comprises a winding lead wire (6a), and the cylindrical filter screen (8) is provided with a through hole for the winding lead wire (6a) to pass through.

10. The electric motor according to claim 6, characterized in that A guide ring (4b) coaxial with the positioning tube (4) is formed on the front end surface of the positioning tube (4); the shape and size of the guide ring (4b) match the central hole, and the guide ring (4b) is inserted into the central hole.

Images