Low-noise alternating current motor

Abstract

The invention aims to provide a low-noise alternating current motor which comprises a damping device, and the damping device comprises supporting legs, a base, a first spring and a second spring and can reduce vibration of a shell. The sound insulation device comprises a sound insulation shell and a sealing bolt, and sound conduction can be hindered, so that noise transmission is reduced; the noise reduction device comprises the first cover body, the second cover body and the sound insulation cotton, noise generated by the airflow can be isolated and absorbed through the sound insulation cotton, and therefore the noise is reduced.

Description

Technical Field

[0001] The invention relates to the field of AC motors, and in particular to a low-noise AC motor. Background Art

[0002] During the use of AC motors, due to the uneven distribution of internal mass, the rotor inside the motor will vibrate when it rotates, and cause resonance in the motor housing and connections, thereby generating noise. If the noise is too loud, it will affect the working environment of the workshop and cause hearing damage to the staff.

[0003] For example, the low-noise motor proposed in CN116545162A comprises a casing, a front end cover and a rear end cover are respectively provided at both ends of the casing, a rotor is provided between the front end cover and the rear end cover, a commutator is provided at one end of the rotor shaft of the rotor close to the front end cover, a brush holder located on the end face of the front end cover is provided on the peripheral side of the commutator, a plurality of Hall elements electrically connected to each other and two brushes symmetrically arranged on both sides of the commutator are fixed on the end face of the brush holder facing the rear end cover, a Hall plate electrically connected to the Hall element is fixed on the other end face of the brush holder. The invention has the characteristics of separately fixing the Hall element and the Hall plate, reducing the influence of brush vibration, maintaining structural stability, and reducing the noise when the motor is working, but it is not suitable for AC motors and does not solve the above problems.

[0004] The present invention can reduce the vibration of the shell through the provided shock absorbing device, thereby achieving the purpose of reducing noise. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a low-noise AC motor, which can reduce the vibration of the housing through the provided vibration reduction device, thereby achieving the purpose of reducing noise.

[0006] The present invention provides a low-noise AC motor, comprising a shell, a front cover, a connecting frame, a rear cover, a stator assembly, a rotor assembly and a rotor fan, characterized in that a front cover is provided at the front of the shell, a rear cover is provided at the rear end of the shell through the connecting frame, the stator assembly is arranged inside the shell, a junction box is provided on one side of the shell and connected to the stator assembly wire, the rotor assembly is rotatably mounted on the front cover and the connecting frame, the rotor assembly is located on the inner side of the stator assembly, a rotor fan is provided at the end of the rotor assembly, the rotor fan is located between the rear cover and the connecting frame, the rear cover is provided with through holes for ventilation and heat dissipation, and also includes a shock absorbing device arranged below the shell, a sound insulation device arranged outside the shell, and a noise reduction device arranged behind the rear cover.

[0007] Furthermore, the shock absorbing device includes a supporting foot, a base, a first spring and a second spring. The supporting foot is arranged below the shell, the base is arranged below the supporting foot, a protruding sleeve is provided on the base, the supporting foot is installed in the sleeve, a first spring is provided between the bottom of the supporting foot and the base, and a second spring is provided on the inside of the sleeve.

[0008] Furthermore, the second spring is conical, the inner side of the second spring is sleeved on the supporting foot, and the outer side of the second spring is sleeved in the sleeve.

[0009] Furthermore, lubricating oil is contained in the sleeve on the base, and a sealing cover is provided above the sleeve to connect the supporting feet, and the sealing cover is made of corrosion-resistant elastic materials including rubber and silicone.

[0010] Furthermore, the sound insulation device includes a sound insulation shell and a sealing bolt. The sound insulation shell is fixed to the outside of the shell. A cavity is formed between the sound insulation shell and the shell. A sealing bolt is provided at the top of the sound insulation shell and corresponding openings. A plurality of heat dissipation fins are provided on the outside of the sound insulation shell and the shell.

[0011] Furthermore, the cavity between the sound insulation shell and the shell body is filled with granular sound-absorbing cotton.

[0012] Furthermore, the noise reduction device includes a first cover body, a second cover body and sound insulation cotton. The first cover body is fixed to the rear of the rear cover through a support frame connected to the base. The second cover body is slidably installed above the first cover body and is fixed with bolts. The sound insulation cotton is arranged between the first cover body and the second cover body. Through holes are arranged on the first cover body, the second cover body and the sound insulation cotton.

[0013] Furthermore, the first cover body and the second cover body are provided with convex columns, and the inner sides of the first cover body and the second cover body are provided with sealing rings to connect the back cover.

[0014] Furthermore, the through holes on the first cover body, the second cover body and the sound insulation cotton have an aperture distribution that is smaller on the inside and larger on the outside.

[0015] Beneficial effects: 1. The supporting foot is installed in the sleeve, and a first spring is provided between the bottom of the supporting foot and the base, and a second spring is provided on the inside of the sleeve. The second spring is conical, and the inner side of the second spring is sleeved with the supporting foot, and the outer side of the second spring is sleeved in the sleeve. The sleeve on the base is filled with lubricating oil, and a sealing cover is provided above the sleeve to connect the supporting foot. The sealing cover is made of corrosion-resistant elastic material including rubber and silicone, and can absorb the vibration transmitted to the shell through the elastic deformation of the first spring, thereby reducing the upper and lower vibrations of the shell, thereby reducing noise, and also reducing the displacement of the supporting foot through the elastic potential energy of the second spring, thereby reducing the vibration of the shell, thereby achieving the purpose of reducing noise.

[0016] 2. The sound insulation shell is fixed to the outside of the shell, and a cavity is formed between the sound insulation shell and the shell. A sealing bolt is provided at the top of the sound insulation shell, and corresponding openings are provided. A plurality of heat dissipation fins are provided on the outside of the sound insulation shell and the shell, which can hinder the conduction of sound through the cavity between the sound insulation shell and the shell, thereby reducing the transmission of noise.

[0017] 3. The first cover body is fixed to the rear of the back cover through a support frame connected to the base, the second cover body is slidably installed on the top of the first cover body and is fixed with bolts, the sound insulation cotton is arranged between the first cover body and the second cover body, and the first cover body, the second cover body and the sound insulation cotton are provided with through holes, when the airflow passes through the first cover body, the second cover body and the through holes on the sound insulation cotton, the noise generated by the airflow can be isolated and absorbed by the sound insulation cotton, thereby reducing noise.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0020] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0021] Figure 3 The explosion of the present invention Figure 1 .

[0022] Figure 4 The explosion of the present invention Figure 2 .

[0023] Figure 5 It is a cross-sectional view of the shock absorbing device of the present invention.

[0024] Figure 6 It is a cross-sectional view of the sound insulating device of the present invention.

[0025] Figure 7 is an exploded view of the noise reduction device of the present invention.

[0026] Figure numerals: shell 1; front cover 2; connecting frame 3; rear cover 4; stator assembly 5; rotor assembly 6; rotor fan 7; supporting foot 8; base 9; first spring 10; second spring 11; sealing cover 12; sound insulation shell 13; lifting ring 14; sealing bolt 15; first cover body 16; second cover body 17; sealing ring 18; sound insulation cotton 19. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0028] Hereinafter, a low noise AC motor according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 - Figure 7 As shown, the low-noise AC motor includes a shell 1, a front cover 2, a connecting frame 3, a rear cover 4, a stator assembly 5, a rotor assembly 6 and a rotor fan 7. The front cover 2 is provided in front of the shell 1, and the rear cover 4 is provided at the rear end of the shell 1 through the connecting frame 3. The stator assembly 5 is arranged inside the shell 1, and a terminal box is provided on one side of the shell 1 to connect the stator assembly 5 with wires. The rotor assembly 6 is rotatably installed on the front cover 2 and the connecting frame 3, and the rotor assembly 6 is located on the inner side of the stator assembly 5. A rotor fan 7 is provided at the end of the rotor assembly 6, and the rotor fan 7 is located between the rear cover 4 and the connecting frame 3. The rear cover 4 is provided with a through hole for ventilation and heat dissipation, and also includes a shock absorbing device arranged below the shell 1, a sound insulation device arranged outside the shell 1, and a noise reduction device arranged behind the rear cover 4.

[0029] In a specific embodiment: the stator assembly 5 is connected to an external circuit through a junction box and energized, so that the stator assembly 5 generates magnetic force to drive the rotor assembly 6 to rotate, thereby making the motor work.

[0030] like Figure 3 and Figure 5 As shown, the low-noise AC motor includes a shock absorbing device, which includes a supporting foot 8, a base 9, a first spring 10 and a second spring 11. The supporting foot 8 is arranged below the housing 1, and the base 9 is arranged below the supporting foot 8. The base 9 is provided with a protruding sleeve, and the supporting foot 8 is installed in the sleeve. A first spring 10 is provided between the bottom of the supporting foot 8 and the base 9, and a second spring 11 is provided on the inner side of the sleeve. The second spring 11 is conical, and the inner side of the second spring 11 is sleeved with the supporting foot 8, and the outer side of the second spring 11 is sleeved in the sleeve.

[0031] Preferably, the sleeve on the base 9 is filled with lubricating oil, and a sealing cover 12 is provided above the sleeve to connect the supporting foot 8, and the sealing cover 12 is made of corrosion-resistant elastic material including rubber and silicone.

[0032] In a specific embodiment: when in use, the first spring 10 supports the supporting foot 8, and the motor will generate vibration when running. The vibration is transmitted to the first spring 10 through the supporting foot 8, so that the elastic deformation of the first spring 10 absorbs the vibration transmitted to the shell 1, thereby reducing the upper and lower vibrations of the shell 1, thereby reducing noise. At the same time, when the shell 1 vibrates, it will produce displacement on the plane. When displaced, the second spring 11 will be deformed through the supporting foot 8, so that the displacement of the supporting foot 8 is reduced by the elastic potential energy of the second spring 11, and then the vibration of the shell 1 is reduced, thereby achieving the purpose of reducing noise.

[0033] like Figure 6 As shown, the low-noise AC motor includes a sound insulation device, which includes a sound insulation shell 13 and a sealing bolt 15. The sound insulation shell 13 is fixed to the outside of the shell 1, and a cavity is formed between the sound insulation shell 13 and the shell 1. The top of the sound insulation shell 13 is provided with a sealing bolt 15 and corresponding openings. The outside of the sound insulation shell 13 and the shell 1 are provided with a plurality of cooling fins for heat dissipation.

[0034] Preferably, the cavity between the sound insulation shell 13 and the housing 1 is filled with granular sound-absorbing cotton.

[0035] In a specific embodiment, when the motor is running, the housing 1 conducts the internal noise out, and under the action of the cavity between the sound insulation shell 13 and the housing 1, the conduction of the sound is hindered, thereby reducing the transmission of the noise.

[0036] like Figure 3 and Figure 7 As shown, the low-noise AC motor includes a noise reduction device, which includes a first cover body 16, a second cover body 17 and sound insulation cotton 19. The first cover body 16 is fixed to the rear of the back cover 4 through a support frame connected to the base 9, and the second cover body 17 is slidably installed above the first cover body 16 and is fixed with bolts. The sound insulation cotton 19 is arranged between the first cover body 16 and the second cover body 17. Through holes are arranged on the first cover body 16, the second cover body 17 and the sound insulation cotton 19. Bosses are arranged on the first cover body 16 and the second cover body 17 for fixing the sound insulation cotton 19. Sealing rings 18 are arranged on the inner sides of the first cover body 16 and the second cover body 17 to connect to the back cover 4, so as to reduce the vibration of the back cover 4 from being transmitted to the first cover body 16 and the second cover body 17, and to prevent airflow from escaping.

[0037] Preferably, the through holes on the first cover body 16 , the second cover body 17 and the sound insulation cotton 19 have an aperture distribution of small inside and large outside, thereby matching the heat dissipation and ventilation structure of large airflow on the outside and small airflow in the middle formed by the rotor fan 7 .

[0038] In a specific embodiment: when the motor is running, the rotor fan 7 rotates to generate airflow, and the airflow passes through the through holes on the first cover body 16 and the second cover body 17 and the sound insulation cotton 19, thereby dissipating the heat of the motor. At the same time, the sound insulation cotton 19 isolates and absorbs the noise generated by the airflow, thereby reducing noise.

[0039] Working principle: the stator assembly 5 is connected to the external circuit through the junction box and energized, so that the stator assembly 5 generates magnetic force to drive the rotor assembly 6 to rotate, so that the motor works. When the motor is running, it will generate vibration, and the vibration will be transmitted to the first spring 10 through the support foot 8, so that the first spring 10 will absorb the vibration transmitted to the shell 1 through the elastic deformation, thereby reducing the vibration of the shell 1 up and down, thereby reducing noise and noise. At the same time, when the shell 1 vibrates, it will produce displacement on the plane. When displaced, the second spring 11 will be deformed through the support foot 8, so that the displacement of the support foot 8 will be reduced by the elastic potential energy of the second spring 11, thereby reducing the vibration of the shell 1, thereby achieving the purpose of reducing noise. Then the shell 1 conducts the internal noise out, and under the action of the cavity between the sound insulation shell 13 and the shell 1, the conduction of sound is hindered, thereby reducing the transmission of noise. Then the rotor fan 7 rotates to generate airflow, and the airflow will pass through the through holes on the first cover 16 and the second cover 17 and the sound insulation cotton 19, thereby dissipating the heat of the motor. At the same time, the sound insulation cotton 19 isolates and absorbs the noise generated by the airflow, thereby reducing noise.

Claims

1. A low-noise AC motor, comprising a housing (1), a front cover (2), a connecting frame (3), a rear cover (4), a stator assembly (5), a rotor assembly (6) and a rotor fan (7), characterized in that: A front cover (2) is provided in front of the housing (1), a rear cover (4) is provided at the rear end of the housing (1) via a connecting frame (3), a stator assembly (5) is provided inside the housing (1), a junction box is provided on one side of the housing (1) and is connected to the stator assembly (5) by wires, a rotor assembly (6) is rotatably mounted on the front cover (2) and the connecting frame (3), the rotor assembly (6) is located on the inner side of the stator assembly (5), a rotor fan (7) is provided at the end of the rotor assembly (6), the rotor fan (7) is located between the rear cover (4) and the connecting frame (3), a through hole for ventilation and heat dissipation is provided on the rear cover (4), and the housing (1) further includes a shock absorbing device provided below the housing (1), a sound insulation device provided outside the housing (1), and a noise reduction device provided behind the rear cover (4).

2. A low noise AC motor as claimed in claim 1, characterized in that: The shock absorbing device comprises a supporting foot (8), a base (9), a first spring (10) and a second spring (11); the supporting foot (8) is arranged below the housing (1); the base (9) is arranged below the supporting foot (8); a protruding sleeve is arranged on the base (9); the supporting foot (8) is installed in the sleeve; a first spring (10) is arranged between the bottom of the supporting foot (8) and the base (9); and a second spring (11) is arranged inside the sleeve.

3. A low noise AC motor as claimed in claim 2, characterized in that: The second spring (11) is conical, the inner side of the second spring (11) is sleeved with the support foot (8), and the outer side of the second spring (11) is sleeved in the sleeve.

4. A low noise AC motor as claimed in claim 2, characterized in that: The sleeve on the base (9) is filled with lubricating oil, and a sealing cover (12) is provided above the sleeve to connect the supporting foot (8), and the sealing cover (12) is made of a corrosion-resistant elastic material including rubber and silicone.

5. A low noise AC motor as claimed in claim 1, characterized in that: The sound insulation device comprises a sound insulation shell (13) and a sealing bolt (15); the sound insulation shell (13) is fixed to the outside of the shell (1); a cavity is formed between the sound insulation shell (13) and the shell (1); the sealing bolt (15) is provided at the top of the sound insulation shell (13) and a corresponding opening; and a plurality of heat dissipation fins are provided on the outside of the sound insulation shell (13) and the shell (1).

6. A low noise AC motor as claimed in claim 5, characterized in that: The cavity between the sound insulation shell (13) and the shell body (1) is filled with granular sound-absorbing cotton.

7. A low noise AC motor as claimed in claim 1, characterized in that: The noise reduction device comprises a first cover body (16), a second cover body (17) and sound insulation cotton (19); the first cover body (16) is fixed to the rear of the rear cover (4) via a support frame connected to the base (9); the second cover body (17) is slidably mounted above the first cover body (16) and is fixed by bolts; the sound insulation cotton (19) is arranged between the first cover body (16) and the second cover body (17); and through holes are provided on the first cover body (16), the second cover body (17) and the sound insulation cotton (19).

8. A low noise AC motor as claimed in claim 7, characterized in that: The first cover body (16) and the second cover body (17) are provided with convex columns, and the inner sides of the first cover body (16) and the second cover body (17) are provided with sealing rings (18) for connecting with the rear cover (4).

9. A low noise AC motor as claimed in claim 7, characterized in that: The through holes on the first cover body (16), the second cover body (17) and the sound insulation cotton (19) have a distribution of apertures with smaller apertures on the inside and larger apertures on the outside.

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