Drainage motor beneficial to reducing temperature rise of rotor

Abstract

The utility model discloses a drainage motor beneficial to reducing temperature rise of a rotor. The drainage motor comprises a stator and a permanent magnet rotor, the stator comprises a shell, and a tubular accommodating cavity and a tubular bearing accommodating cavity are formed in the shell; the permanent magnet rotor comprises a rotor iron core and a rotor shaft which are coaxially arranged; the outer end of the rotor shaft is fixedly connected with the impeller; the inner end of the rotor shaft is fixedly connected with the bearing; the rotor core is arranged in the tubular accommodating cavity, the bearing is fixed in the tubular bearing accommodating cavity in an interference fit manner, and the inner side wall of the tubular bearing accommodating cavity is provided with an exhaust groove extending along the axial direction; the motor further comprises a duckbill valve arranged at the front end of the stator shell, the duckbill valve is arranged on the outer side wall of the tubular bearing containing cavity in a sleeving mode, and the tubular containing cavity is communicated with an exhaust port of the duckbill valve through an exhaust groove in the inner side wall of the tubular bearing containing cavity. The drainage motor can effectively discharge high-temperature gas in the stator cavity containing the permanent magnet rotor out of the motor, so that the temperature in the stator cavity is effectively reduced, the temperature rise of the motor rotor is reduced, the service life of the motor is prolonged, and the drainage motor is simple in structure and easy to produce.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage motors, in particular to a drainage motor which is beneficial to reducing the temperature rise of a rotor. Background Art

[0002] In the drainage motors currently on the market, the permanent magnet rotor is sealed and installed in the stator cavity. The permanent magnet rotor and its impeller rotate at a speed of 3000 revolutions per minute. After working for a period of time, the temperature in the stator cavity accommodating the permanent magnet rotor rises, and the gas in the cavity will expand at high temperature, causing the permanent magnet rotor to work under high temperature and high pressure, further aggravating its heating problem, thereby reducing the service life of the permanent magnet rotor.

[0003] In the permanent magnet motor rotor with publication number CN102104289A, circumferential grooves are opened on the rotor protective cover to block the axial channel of the rotor eddy current, reduce the rotor eddy current loss, and thus reduce the heat generation of the rotor; at the same time, the surface area of ​​the rotor cover is increased, which is more conducive to the heat dissipation of the rotor, thereby reducing the temperature rise of the motor rotor and improving the efficiency and service life of the motor. Although this structure reduces the temperature rise of the motor rotor to a certain extent, it is complex in structure and high in cost.

[0004] In a permanent magnet synchronous motor with publication number CN101626185A, the rotor shaft is a hollow shaft, and inside the hollow shaft is an inner ventilation hole that is connected at both ends, an outer ventilation hole connected to the inner ventilation hole of the hollow shaft is radially arranged on the rotor shaft, a magnetic isolation sleeve ventilation hole is radially arranged on the magnetic isolation sleeve, and a magnetic pole ventilation hole is radially arranged on the magnetic pole. The magnetic isolation sleeve ventilation holes and the magnetic pole ventilation holes are connected to the inner ventilation holes, and the three form a radiant heat dissipation structure that crosses axially and radially, which effectively controls the temperature rise of the motor during operation. Although this structure reduces the temperature rise of the motor rotor to a certain extent, it has a complex structure, high cost, and is not easy to produce.

[0005] In a permanent magnet synchronous motor rotor structure with a publication number of CN103915926B, the permanent magnets of each pole in the rotor structure are triangular trapezoids, the maximum value of the thickness of the permanent magnet in the magnetization direction appears in the middle of a pole, and the minimum value appears on both sides of the permanent magnet of the pole. The thickness of the permanent magnet in the magnetization direction linearly transitions from the thickest part in the middle magnetization direction to the thinnest parts in the magnetization direction on both sides. The transition process is a linear transition, which reduces the temperature rise of the motor rotor and the permanent magnet. Similarly, although this structure reduces the temperature rise of the motor rotor to a certain extent, it has a complex structure and high cost. Utility Model Content

[0006] Purpose of the utility model: The purpose of the utility model is to provide a drainage motor which is beneficial to reducing the temperature rise of the rotor. The drainage motor has a simple structure and can effectively discharge the high-temperature gas in the stator cavity accommodating the permanent magnet rotor out of the motor, thereby effectively reducing the temperature in the stator cavity.

[0007] Technical solution: The drainage motor described in the utility model includes a stator and a permanent magnet rotor; the stator includes a shell, and a tubular accommodating cavity and a tubular bearing accommodating cavity are provided in the shell; the permanent magnet rotor includes a coaxially arranged rotor core and a rotor shaft; the outer end of the rotor shaft is fixedly connected to the impeller, and the inner end of the rotor shaft is fixedly connected to the bearing; the rotor core is placed in the tubular accommodating cavity, and the bearing is fixed in the tubular bearing accommodating cavity by interference fit, and an exhaust groove extending in the axial direction is opened on the inner side wall of the tubular bearing accommodating cavity; it also includes a duckbill valve arranged at the front end of the stator shell, the duckbill valve sleeve is arranged on the outer side wall of the tubular bearing accommodating cavity, and the tubular accommodating cavity is connected to the exhaust port of the duckbill valve through the exhaust groove on the inner side wall of the tubular bearing accommodating cavity.

[0008] Wherein, the duckbill valve is a rubber duckbill valve.

[0009] Wherein, the duckbill valve comprises a fixed sleeve and an exhaust cavity surrounded by a curved wall, and the exhaust cavity has an exhaust port on a side away from the fixed sleeve.

[0010] When the air pressure in the tubular accommodation cavity is normal, the exhaust port is in a closed state, and at this time, the gap spacing of the exhaust port is 0.05 to 0.1 mm.

[0011] Wherein, the tubular accommodating cavity is connected with the exhaust cavity through an exhaust groove on the inner wall of the tubular bearing accommodating cavity; the number of the exhaust grooves is at least two.

[0012] Wherein, the tubular accommodating cavity is coaxially arranged with the tubular bearing accommodating cavity, and the diameter of the tubular accommodating cavity is larger than the diameter of the tubular bearing accommodating cavity.

[0013] When the gas in the tubular containing chamber accommodating the permanent magnet rotor expands at high temperature, the high-temperature gas in the tubular containing chamber passes through the exhaust groove and the exhaust chamber in sequence under the driving force of pressure, and drives the rubber exhaust port to open, and the high-temperature gas is discharged to the outside of the drainage motor through the exhaust port, thereby effectively reducing the temperature rise of the rotor. When the air pressure in the tubular containing chamber accommodating the permanent magnet rotor is normal, the exhaust port is in a normal closed state, which has a dust-proof effect.

[0014] Beneficial effects: Compared with the prior art, the utility model has the following advantages: the drainage motor of the utility model can effectively discharge the high-temperature gas in the stator cavity accommodating the permanent magnet rotor out of the motor, thereby effectively reducing the temperature in the stator cavity, achieving the effect of reducing the temperature rise of the motor rotor and increasing the service life of the motor, and its structure is simple and easy to produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the drainage motor of the utility model;

[0016] Figure 2 This is a schematic diagram of the main structure of the drainage motor of the utility model;

[0017] Figure 3 for Figure 2 Sectional view in the AA direction;

[0018] Figure 4 for Figure 3 Cross-sectional view in the BB direction;

[0019] Figure 5 is a schematic diagram of the structure of the shell;

[0020] Figure 6 It is a three-dimensional structural schematic diagram of the duckbill valve;

[0021] Figure 7 It is a structural schematic diagram of the duckbill valve;

[0022] Figure 8 for Figure 7 A partial enlarged view of Figure I. DETAILED DESCRIPTION

[0023] like Figures 1 to 8 As shown, the drainage motor of the utility model comprises a stator 1 and a permanent magnet rotor 2; the stator 1 comprises a housing 11, a tubular accommodating chamber 111 and a tubular bearing accommodating chamber 112 are arranged in the housing 11, the tubular accommodating chamber 111 and the tubular bearing accommodating chamber 112 are coaxially arranged, and the diameter of the tubular accommodating chamber 111 is larger than the diameter of the tubular bearing accommodating chamber 112; the permanent magnet rotor 2 comprises a rotor core 21 and a rotor shaft 22, the rotor shaft 22 passes through the axial hole of the rotor core 21 and is fastened to the rotor core 21; the outer end of the rotor shaft 22 is fixedly connected to the impeller 23, and the inner end of the rotor shaft 22 extends into the hole of the bearing 3 and is fixedly connected to the bearing 3; the rotor core 21 is placed in the tubular accommodating chamber 111, the bearing 3 is fixed in the tubular bearing accommodating chamber 112 by interference fit, and the inner side wall of the tubular bearing accommodating chamber 112 is provided with an exhaust groove 114 extending in the axial direction;

[0024] The drainage motor of the utility model also includes a duckbill valve 4 arranged at the front end of the stator housing 11. The duckbill valve 4 is a rubber duckbill valve. The duckbill valve 4 includes a fixed sleeve 41 and an exhaust chamber 43 surrounded by a curved wall 42. The exhaust chamber 43 has an exhaust port 44 on the side away from the fixed sleeve 41; the fixed sleeve 41 of the duckbill valve 4 is sleeved on the outer side wall 113 of the tubular bearing accommodating chamber 112, the tubular accommodating chamber 111 is connected with the exhaust chamber 43 through the exhaust groove 114 on the inner wall of the tubular bearing accommodating chamber 112, and the number of the exhaust grooves 114 is three; the tubular accommodating chamber 111 is connected with the exhaust port 44 of the duckbill valve 4 through the exhaust groove 114 and the exhaust chamber 43.

[0025] When the air pressure in the tubular accommodation chamber 111 is normal, the exhaust port 44 is in a closed state, and the gap spacing t of the exhaust port 44 is 0.05-0.1 mm. When the gas in the tubular accommodation chamber 111 accommodating the permanent magnet rotor 2 expands at high temperature, the high-temperature gas in the tubular accommodation chamber 111 passes through the exhaust groove 114 and the exhaust chamber 43 in sequence under pressure driving, and drives the rubber exhaust port 44 to open, and the high-temperature gas is discharged to the outside of the drainage motor through the exhaust port 44, thereby effectively reducing the temperature rise of the rotor.

Claims

1. A drainage motor that is beneficial to reducing rotor temperature rise, characterized in that: The invention comprises a stator (1) and a permanent magnet rotor (2); the stator (1) comprises a housing (11), wherein a tubular accommodating cavity (111) and a tubular bearing accommodating cavity (112) are provided in the housing (11); the permanent magnet rotor (2) comprises a coaxially arranged rotor core (21) and a rotor shaft (22), wherein the outer end of the rotor shaft (22) is connected to an impeller (23), and the inner end of the rotor shaft (22) is connected to a bearing (3); the rotor core (21) is placed in the tubular accommodating cavity (111), and the bearing (3 ) is fixed in a tubular bearing accommodating chamber (112) by interference fit, and an exhaust groove (114) extending in the axial direction is formed on the inner side wall of the tubular bearing accommodating chamber (112); and also includes a duckbill valve (4) arranged at the front end of the stator housing (11), the duckbill valve (4) is sleeved on the outer side wall (113) of the tubular bearing accommodating chamber (112), and the tubular accommodating chamber (111) is connected to the exhaust port (44) of the duckbill valve (4) through the exhaust groove (114) on the inner side wall of the tubular bearing accommodating chamber (112).

2. The drainage motor that is beneficial to reducing rotor temperature rise according to claim 1 is characterized in that: The duckbill valve (4) is a rubber duckbill valve.

3. The drainage motor that is beneficial to reducing rotor temperature rise according to claim 2 is characterized in that: The duckbill valve (4) comprises a fixed sleeve (41) and an exhaust cavity (43) formed by a curved wall (42), wherein the exhaust cavity (43) has an exhaust port (44) on a side away from the fixed sleeve (41).

4. The drainage motor that is beneficial to reducing rotor temperature rise according to claim 3 is characterized in that: When the air pressure in the tubular accommodation cavity (111) is normal, the exhaust port (44) is in a closed state, and at this time, the gap spacing of the exhaust port (44) is 0.05 to 0.1 mm.

5. The drainage motor that is beneficial to reducing rotor temperature rise according to claim 1 is characterized in that: The tubular accommodating chamber (111) is connected to the exhaust chamber (43) via an exhaust groove (114) on the inner wall of the tubular bearing accommodating chamber (112); the number of the exhaust grooves (114) is at least two.

6. The drainage motor that is beneficial to reducing rotor temperature rise according to claim 1 is characterized in that: The tubular accommodating cavity (111) is coaxially arranged with the tubular bearing accommodating cavity (112), and the diameter of the tubular accommodating cavity (111) is greater than the diameter of the tubular bearing accommodating cavity (112).

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