A noise-reducing direct current motor

Abstract

The application relates to a noise reduction direct current motor, belonging to the direct current motor technical field, which comprises a noise reduction box, the noise reduction box is used for fixing and installing a direct current motor into the noise reduction box, the cross section of the noise reduction box is in a rectangular shape, the noise reduction box is hollowly arranged along the side wall parallel to the length direction of a direct current motor output shaft to form a cavity, a plurality of partitions are arranged in the cavity, the plane where the partitions are located is perpendicular to the length direction of the direct current motor output shaft, a plurality of elastic cloths are arranged in the adjacent partitions, the elastic cloths are in a tension state, the elastic cloths are used for transmitting the noise generated by the direct current motor to the elastic cloths and driving the elastic cloths to vibrate, and sound insulation cotton is filled between the elastic cloths deviating from the direct current motor body and the cavity side wall. The application has the effect of reducing noise propagation during motor operation.

Description

Technical Field

[0001] This application relates to the field of DC motor technology, and in particular to a noise-reducing DC motor. Background Technology

[0002] A DC motor is a type of motor that converts direct current electrical energy into mechanical energy. It is widely used in electric drives due to its excellent speed regulation performance. DC motors are classified into permanent magnet, separately excited, and self-excited types according to their excitation method. Self-excited motors are further divided into shunt-wound, series-wound, and compound-wound types. A DC motor consists of two parts: the stator and the rotor. The stator mainly includes the main magnetic poles, frame, commutating poles, and brush assembly; the rotor mainly includes the armature core, armature windings, commutator, shaft, and fan. During operation, the rotor acts as the output shaft, outputting mechanical energy. DC motors generate noise in the following ways during operation:

[0003] Electromagnetic noise is mainly caused by air gap harmonic magnetic fields. The radial alternating magnetic pull generated by the interaction of stator and rotor tooth harmonic fluxes causes periodic dynamic radial deformation of the stator core yoke, which in turn excites electromagnetic noise in the stator. In addition, broken bars in squirrel-cage rotors, short circuits between turns in wound rotors, rotor eccentricity, and asymmetry or short circuits between turns in stator windings can all cause electromagnetic noise.

[0004] Mechanical noise is mainly composed of bearing noise and structural component resonance noise, followed by rotational vibration noise.

[0005] Ventilation noise is mainly generated by the periodic impact of protruding parts such as fan blades and rotor blades on the air when the motor rotates.

[0006] Regarding the aforementioned technologies, the inventors believe that the following drawbacks exist: the noise generated by the DC motor is transmitted into the working environment through the air, resulting in a relatively harsh working environment for the workers. Summary of the Invention

[0007] To reduce noise propagation during motor operation, this application provides a noise-reducing DC motor.

[0008] The noise-reducing DC motor provided in this application adopts the following technical solution:

[0009] A noise-reducing DC motor includes a noise-reducing box for fixing the DC motor inside the box. The noise-reducing box has a rectangular cross-section and is hollow along a side wall parallel to the length of the DC motor's output shaft, forming a cavity. Multiple partitions are arranged inside the cavity, with the plane of each partition perpendicular to the length of the DC motor's output shaft. Multiple layers of elastic fabric are arranged inside adjacent partitions, and the elastic fabric is in a taut state. The elastic fabric is used to transmit noise generated by the DC motor to the elastic fabric and drive the elastic fabric to vibrate. Sound-insulating cotton is filled between the elastic fabric away from the DC motor body and the side wall of the cavity.

[0010] By adopting the above technical solution, the noise generated during the operation of the DC motor is transmitted from the DC motor body, passing through the elastic cloth and sound insulation cotton in sequence. When the noise passes through the elastic cloth, it causes the elastic cloth to vibrate. During the vibration process, the elastic cloth converts the energy of the noise into the kinetic energy and elastic potential energy of the elastic cloth, thereby reducing the energy of the noise, thus reducing the loudness, and thus reducing the decibel of the noise, thereby reducing the propagation of the noise. The setting of multiple layers of elastic cloth further reduces the propagation of the noise. After the noise is transmitted to the sound insulation cotton, the sound insulation cotton, being a porous material, further hinders the propagation of the noise.

[0011] Optionally, a first telescopic rod is provided between adjacent elastic fabrics, with both ends of the first telescopic rod fixedly mounted on the elastic fabrics on both sides, and an elastic element is provided inside the first telescopic rod for driving the first telescopic rod to the initial state.

[0012] By adopting the above technical solution, the elastic cloth drives the first telescopic rod to reciprocate during vibration. During the extension and retraction process, the first telescopic rod further converts the energy of the noise, thereby reducing the loudness and propagation of the noise. At the same time, during the extension and retraction process, under the action of the elastic element, the kinetic energy of the first telescopic rod is converted into the potential energy of the elastic element, further reducing the energy of the noise, thereby reducing the intensity and propagation of the noise.

[0013] Optionally, the noise reduction box is provided with a circulation pipe, which includes a threaded pipe wound around the DC motor body and a connecting pipe for connecting the two ends of the threaded pipe. Cooling water is injected into both the connecting pipe and the threaded pipe, and the cooling water fills the connecting pipe and the threaded pipe. The length direction of the connecting pipe is parallel to the length direction of the DC motor output shaft. A sliding plate is slidably disposed in the connecting pipe. The sliding plate slides along the length direction of the connecting pipe, and the sliding of the sliding plate drives the cooling water to flow. The noise reduction DC motor also includes a conversion component for converting the DC motor noise energy into the kinetic energy of driving the sliding plate to slide back and forth in the connecting pipe.

[0014] By adopting the above technical solution, the DC motor generates a certain amount of heat during operation. Cooling water helps cool the motor body, reducing the possibility of damage. However, the heat generated in different parts of the DC motor varies, potentially causing localized heating of the cooling water and resulting in a less effective cooling effect. In this case, the conversion component transforms noise energy into kinetic energy that drives the sliding plate. During sliding, the plate moves the cooling water in the threaded pipe and connecting pipe, reducing the possibility of localized high temperatures in the cooling water, improving the cooling effect on the DC motor, and extending its service life. Furthermore, the conversion component further reduces noise energy, lowering the noise level and its propagation.

[0015] Optionally, the conversion component includes a second telescopic rod disposed within a noise reduction box. The second telescopic rod is a telescopic structure, with one end fixedly mounted on an elastic cloth and the other end fixedly mounted on the side wall of a cavity. A first gear is rotatably disposed within the cavity. A rack meshing with the first gear is disposed on the sliding rod of the second telescopic rod. Due to noise vibration, the elastic cloth causes the sliding rod of the second telescopic rod to slide, thereby causing the rack to slide and thus causing the first gear to rotate. A reciprocating screw is rotatably disposed within the connecting pipe, and the sliding plate is threadedly connected to the reciprocating screw. The conversion component also includes a rotating component for transmitting the reciprocating oscillation of the first gear to the reciprocating screw and driving the reciprocating screw to rotate.

[0016] By adopting the above technical solution, when the elastic cloth vibrates due to noise, the elastic cloth drives the second telescopic rod to slide back and forth. During the sliding process, the second telescopic rod drives the rack to slide, and the rack to slide drives the first gear to rotate. Under the action of the rotating component, the first gear swings back and forth, driving the reciprocating screw to rotate. The rotation of the reciprocating screw drives the slide plate to slide during the rotation process, thereby driving the cooling water to flow in the connecting pipe and the circulation pipe. The operation is simple and convenient.

[0017] Optionally, the rotating component includes a first actuating rod disposed on the first gear, a first driving rod rotatably disposed within the cavity, the length direction of the first driving rod being parallel to the axial direction of the first gear, a plurality of first abutting rods being disposed circumferentially on the first driving rod, the first actuating rod swinging to abut against the first abutting rods and driving the first driving rod to rotate, a second driving rod rotatably disposed within the noise reduction box, the length direction of the second driving rod being parallel to the length direction of the reciprocating screw, and a first conveyor belt being disposed between the first driving rod and the second driving rod, and between the second driving rod and the reciprocating screw.

[0018] By adopting the above technical solution, during the reciprocating oscillation of the first gear, when the first gear oscillates, the first gear drives the first actuating rod to rotate, the first oscillating rod rotates and abuts against the first abutting rod, the first abutting rod rotates around the first driving rod as the rotation axis, thereby driving the first driving rod to rotate, the first driving rod drives the first conveyor belt to run during the rotation, thereby driving the second driving rod to rotate, the second driving rod rotates and drives the reciprocating screw to rotate, thereby driving the slide plate to slide, which is simple and convenient to operate.

[0019] Optionally, the rotating component further includes a compensation component, which is used to drive the reciprocating screw to rotate after the first actuating rod separates from the first abutting rod.

[0020] By adopting the above technical solution, during the reciprocating oscillation of the first gear, after the first gear reverses and separates from the first abutting rod, the first drive rod is in a stationary state, which causes the reciprocating screw to be in a stationary state. The stationary period of the sliding plate is relatively long, resulting in a relatively poor cooling effect of the cooling water on the DC motor body. Under the action of the compensation component, after the first actuating rod separates from the first abutting rod, it drives the reciprocating screw to rotate. The rotation of the reciprocating screw drives the sliding plate to slide, thereby reducing the stationary period of the sliding plate and improving the cooling effect on the DC motor.

[0021] Optionally, the compensation component includes a third drive rod rotatably disposed within the cavity, the length direction of the third drive rod being parallel to the length direction of the first drive rod, the first actuating rod being located between the first drive rod and the third drive rod, and a second abutting rod being disposed on the third drive rod that abuts against the first actuating rod. The first actuating rod rotates counterclockwise to drive the first drive rod to rotate, and rotates clockwise to drive the third drive rod to rotate. The compensation component also includes a second gear coaxially disposed on the third drive rod, a third gear meshing with the second gear being rotatably disposed within the cavity, and a second conveyor belt being disposed between the third gear and the reciprocating lead screw.

[0022] By adopting the above technical solution, after the first actuating rod separates from the first abutting rod, the first actuating rod rotates toward the third driving rod and then abuts against the second abutting rod. The second abutting rod drives the third driving rod to rotate, and the rotation of the third driving rod drives the second gear to rotate. The rotation of the second gear drives the third gear to rotate. After the gears reverse direction, the rotation direction of the third gear is the same as the rotation direction of the first driving rod. The rotation of the third gear drives the reciprocating screw to rotate, which in turn drives the reciprocating screw to rotate, thereby reducing the blank period of the sliding plate and making the operation simple and convenient.

[0023] Optionally, the ends of the first actuating rod, the first abutting rod, and the second abutting rod used for abutting collision are all provided with rubber sleeves.

[0024] By adopting the above technical solution, the impact during the contact process of the first actuating rod, the first abutting rod, and the second abutting rod is reduced under the action of the rubber sleeve, thereby reducing the noise generated during the transmission process.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. During the operation of a DC motor, the noise generated is transmitted from the DC motor body, passing through the elastic cloth and sound insulation cotton in sequence. When the noise passes through the elastic cloth, it causes the elastic cloth to vibrate. During the vibration process, the elastic cloth converts the energy of the noise into the kinetic energy and elastic potential energy of the elastic cloth, thereby reducing the energy of the noise, thus reducing the loudness, and thus reducing the decibel of the noise, thereby reducing the propagation of the noise. The setting of multiple layers of elastic cloth further reduces the propagation of noise.

[0027] 2. After the noise is transmitted to the sound insulation cotton, the porous nature of the cotton further hinders the propagation of the noise. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a noise-reducing DC motor according to an embodiment of this application;

[0029] Figure 2 This is a cross-sectional view of a noise reduction box in a noise reduction DC motor according to an embodiment of this application;

[0030] Figure 3 This is a cross-sectional view of a connecting pipe in a noise-reducing DC motor according to an embodiment of this application;

[0031] Figure 4 yes Figure 2 Cross-sectional view of the rear side;

[0032] Figure 5 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0033] Figure 6 yes Figure 4 Enlarged schematic diagram of part B.

[0034] Explanation of reference numerals in the attached drawings: 1. Noise reduction box; 2. DC motor; 3. Cavity; 4. Partition plate; 5. Elastic cloth; 6. First telescopic rod; 7. Threaded pipe; 8. Connecting pipe; 9. Air inlet; 10. Slide plate; 11. Second telescopic rod; 12. First gear; 13. Rack; 14. Reciprocating screw; 15. First actuating rod; 16. First drive rod; 17. First abutting rod; 18. Second drive rod; 19. First conveyor belt; 20. Third drive rod; 21. Second abutting rod; 22. Second gear; 23. Third gear; 24. Second conveyor belt; 25. Sound insulation cotton. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0036] This application discloses a noise-reducing DC motor. (Refer to...) Figure 1 and Figure 2 The noise-reducing DC motor includes a noise-reducing box 1, which is used to fix the DC motor 2 inside the noise-reducing box 1. The cross-section of the noise-reducing box 1 is rectangular to facilitate stable installation at the required location. The noise-reducing box 1 is hollow along the side wall parallel to the length direction of the output shaft of the DC motor 2 to form a cavity 3. All four side walls are separated. Multiple partitions 4 are provided in the cavity 3, which divide the cavity 3 into individual compartments. The plane of the partition 4 is perpendicular to the length direction of the output shaft of the DC motor 2. Multiple layers of elastic cloth 5 are provided between adjacent partitions 4. The elastic cloth 5 is made of imitation animal skin. The elastic cloth 5 is in a taut state between adjacent partitions 4. The elastic cloth 5 is used to transmit the noise generated by the DC motor 2 to the elastic cloth 5 and drive the elastic cloth 5 to vibrate.

[0037] During operation, the sound generated by the DC motor 2 is transmitted to the elastic cloth 5, causing the elastic cloth 5 to vibrate, thereby reducing the loudness and decibels of the sound. When the loudness of the sound is reduced, its transmission capacity is greatly reduced, which in turn reduces the possibility of the sound being transmitted out of the noise reduction box 1 and improves the comfort of the working environment.

[0038] Reference Figure 2 and Figure 3 To further reduce the loudness of the sound, a first telescopic rod 6 is provided between adjacent elastic fabrics 5. Both ends of the first telescopic rod 6 are fixedly mounted on the elastic fabrics 5 on both sides. The length direction of the first telescopic rod 6 is perpendicular to the length direction of the output shaft of the DC motor 2. The first telescopic rod 6 includes a sleeve rod disposed between adjacent elastic fabrics 5 and a slide rod slidably sleeved in the sleeve rod. Both the sleeve rod and the slide rod are fixedly mounted on adjacent elastic fabrics 5. An elastic element for driving the first telescopic rod 6 to its initial state is provided inside the first telescopic rod 6. The elastic element includes a spring disposed in the cavity of the sleeve rod. The other end of the spring is fixedly mounted on the end of the slide rod. Furthermore, a damper is sleeved inside the spring. One end of the damper is fixedly mounted on the sleeve rod, and the other end is fixedly mounted on the slide rod. When the elastic fabric 5 drives the first telescopic rod 6 to slide, under the action of the spring and the damper, the kinetic energy of the elastic fabric 5 is converted into potential energy, further reducing the sound energy.

[0039] Reference Figure 3 and Figure 4The DC motor 2 is located inside the noise reduction box 1, which makes it difficult for the heat generated by the DC motor 2 to be transferred to the air, eventually leading to damage to the DC motor 2. To extend the service life of the DC motor 2, a circulation pipe is installed inside the noise reduction box 1. The circulation pipe includes a threaded tube 7 that is threaded around the body of the DC motor 2 and a connecting tube 8 for connecting the two ends of the threaded tube 7. Furthermore, the threaded tubes 7 are close to each other to reduce the blank space of the threaded tubes 7. Cooling water is injected into both the connecting tube 8 and the threaded tube 7, and the length direction of the connecting tube 8 is parallel to the length direction of the output shaft of the DC motor 2. Under the action of the cooling water, the body of the DC motor 2 is cooled down, extending the service life of the DC motor 2. Furthermore, an air inlet 9 is opened on the end wall of the noise reduction box 1 away from the output shaft of the DC motor 2, and the air inlet 9 is opened directly opposite the cooling fan of the DC motor 2.

[0040] Reference Figure 3 and Figure 5 To improve the cooling effect of the cooling water on the DC motor 2, a sliding plate 10 is slidably installed inside the connecting pipe 8. The peripheral wall of the sliding plate 10 is tightly fitted with the inner peripheral wall of the connecting pipe 8. Furthermore, a limit block is provided on the side wall of the sliding plate 10, and a limit groove is opened inside the connecting pipe 8 for the limit block to slide. The sliding plate 10 slides along the length of the connecting pipe 8, and the sliding of the sliding plate 10 drives the cooling water to flow. The noise reduction DC motor also includes a conversion component for converting the noise energy of the DC motor 2 into the kinetic energy for driving the sliding plate 10 to reciprocate within the connecting pipe 8.

[0041] Reference Figure 3 , Figure 5 and Figure 6The conversion component includes a second telescopic rod 11 disposed within the noise reduction box 1. Further, the length direction of the second telescopic rod 11 is perpendicular to the length direction of the output shaft of the DC motor 2. The second telescopic rod 11 is a telescopic structure, with one end fixedly mounted on the elastic cloth 5 and the other end fixedly mounted on the side wall of the cavity 3. The end of the second telescopic rod 11 closest to the DC motor 2 body is located at the point where the DC motor 2 operates at maximum noise, so that the sound generated by the DC motor 2 drives the extension and retraction of the second telescopic rod 11. A first gear 12 is rotatably disposed within the cavity 3, with the rotation axis of the first gear 12 parallel to the length direction of the output shaft of the DC motor 2. A rack 13 is provided on the sliding rod of the rod 11 to mesh with the first gear 12. Furthermore, the teeth of the rack 13 face the side wall of the noise reduction box 1. The elastic cloth 5 causes the sliding rod of the second telescopic rod 11 to slide due to noise vibration, so as to drive the rack 13 to slide and drive the first gear 12 to rotate. A reciprocating screw 14 is rotatably provided inside the connecting pipe 8. The length direction of the reciprocating screw 14 is parallel to the length direction of the connecting pipe 8. The surface of the reciprocating screw 14 is coated with waterproof paint. The slide plate 10 is threadedly connected to the reciprocating screw 14. The conversion component also includes a rotating component for transmitting the reciprocating oscillation of the first gear 12 to the reciprocating screw 14 and driving the reciprocating screw 14 to rotate.

[0042] Reference Figure 3 , Figure 5 and Figure 6 The rotating component includes a first actuating rod 15 mounted on the first gear 12, the length direction of the first actuating rod 15 being parallel to the axial direction of the first gear 12. A first driving rod 16 is rotatably mounted inside the cavity 3, the length direction of the first driving rod 16 being parallel to the axial direction of the first gear 12. A plurality of first abutting rods 17 are evenly arranged circumferentially on the first driving rod 16. The first actuating rod 15 swings to abut against the first abutting rods 17 and drives the first driving rod 16 to rotate. A second driving rod 18 is rotatably mounted inside the noise reduction box 1, the length direction of the second driving rod 18 being parallel to the length direction of the reciprocating screw 14. A first conveyor belt 19 is provided between the first driving rod 16 and the second driving rod 18, and between the second driving rod 18 and the reciprocating screw 14.

[0043] When the elastic cloth 5 reciprocates, the second telescopic rod 11 drives the rack 13 to slide. The sliding of the rack 13 drives the first gear 12 to rotate at a small angle. The rotation of the first gear 12 drives the first actuating rod 15 to rotate. After the first actuating rod 15 rotates to abut against the first abutting rod 17, the first abutting rod 17 drives the first driving rod 16 to rotate. Under the action of the first conveyor belt 19, the rotation of the first driving rod 16 is transmitted to the reciprocating screw 14, which in turn drives the reciprocating screw 14 to rotate. The operation is simple and convenient.

[0044] Reference Figure 3 , Figure 5 and Figure 6To reduce the rotational idle period of the reciprocating screw 14, the rotating component also includes a compensation component. The compensation component is used to drive the reciprocating screw 14 to rotate after the first actuating rod 15 separates from the first abutting rod 17. The compensation component includes a third driving rod 20 rotatably disposed in the cavity 3. The length direction of the third driving rod 20 is parallel to the length direction of the first driving rod 16. The first actuating rod 15 is located between the first driving rod 16 and the third driving rod 20 and is located in the same vertical plane. The third driving rod 20 is provided with a plurality of second abutting rods 21 that abut against the first actuating rod 15. The plurality of second abutting rods 21 are evenly arranged around the circumference of the third driving rod 20. The first actuating rod 15 rotates counterclockwise to drive the first driving rod 16 to rotate, and the first actuating rod 15 rotates clockwise to drive the third driving rod 20 to rotate. The compensation component also includes a second gear 22 coaxially disposed on the third driving rod 20. A third gear 23 meshing with the second gear 22 is rotatably disposed in the cavity 3. A second conveyor belt 24 is disposed between the third gear 23 and the reciprocating screw 14.

[0045] When the first gear 12 reciprocates at a small angle, the first actuating rod 15 abuts against the first abutting rod 17 and the second abutting rod 21 respectively, thereby driving the corresponding first driving rod 16 and third driving rod 20 to rotate. When the third driving rod 20 rotates, it first passes through the reversal of the second gear 22 and the third gear 23, and then drives the reciprocating screw 14 to rotate through the second conveyor belt 24. At the same time, under the action of the second gear 22 and the third gear 23, the reciprocating screw 14 rotates in the same direction, thereby driving the slide plate 10 to slide back and forth in the connecting pipe 8.

[0046] To reduce the impact noise between the first actuating rod 15 and the first abutting rod 17 and the second abutting rod 21, rubber sleeves are provided at the ends of the first actuating rod 15, the first abutting rod 17 and the second abutting rod 21 used for abutting and collision.

[0047] Reference Figure 2 To further improve the sound insulation effect of the noise reduction box 1, the space between the elastic cloth 5 away from the DC motor 2 body and the side wall of the cavity 3 is filled with sound insulation cotton 25; after the sound passes through the elastic cloth 5, it is transmitted to the sound insulation cotton 25 and enters the channel inside the sound insulation cotton 25, thereby improving the sound attenuation treatment.

[0048] The implementation principle of a noise-reducing DC motor in this application embodiment is as follows:

[0049] When the DC motor 2 is working, the sound it generates is transmitted to the elastic cloth 5 and causes the elastic cloth 5 to vibrate, thereby reducing the loudness and decibels of the sound. When the loudness of the sound is reduced, its transmission capacity is greatly reduced, which in turn reduces the possibility of the sound being transmitted out of the noise reduction box 1.

[0050] Meanwhile, as the elastic cloth 5 reciprocates, the second telescopic rod 11 drives the rack 13 to slide. The sliding of the rack 13 drives the first gear 12 to rotate at a small angle. The rotation of the first gear 12 drives the first actuating rod 15 to rotate. After the first actuating rod 15 rotates and abuts against the first abutting rod 17, the first abutting rod 17 drives the first driving rod 16 to rotate. Under the action of the first conveyor belt 19, the rotation of the first driving rod 16 is transmitted to the reciprocating screw 14, which in turn drives the reciprocating screw 14 to rotate. The rotation of the reciprocating screw 14 drives the slide plate 10 to slide, thereby driving the cooling water to flow in the connecting pipe 8 and the threaded pipe 7, which improves the cooling treatment of the DC motor 2. At the same time, it improves the conversion effect of sound energy, further improving the noise reduction treatment of the DC motor 2.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A noise-reduced direct current motor, characterized by: The application relates to a noise reduction box (1) for fixedly mounting a direct current motor (2) in the noise reduction box (1), wherein the cross section of the noise reduction box (1) is rectangular, the noise reduction box (1) is hollow along the side wall parallel to the length direction of the output shaft of the direct current motor (2) to form a cavity (3), a plurality of partitions (4) are arranged in the cavity (3), the plane of the partitions (4) is perpendicular to the length direction of the output shaft of the direct current motor (2), a plurality of layers of elastic cloth (5) are arranged in the adjacent partitions (4), the elastic cloth (5) is in a tension state, the elastic cloth (5) is used for transmitting the noise generated by the direct current motor (2) to the elastic cloth (5) to drive the elastic cloth (5) to vibrate, and sound insulation cotton (25) is filled between the elastic cloth (5) and the side wall of the cavity (3) away from the body of the direct current motor (2). First telescopic rods (6) are arranged between the adjacent elastic cloth (5), both ends of the first telescopic rods (6) are fixedly arranged on the elastic cloth (5) on both sides, the first telescopic rods (6) comprise sleeve rods arranged between the adjacent elastic cloth (5) and sliding rods slidingly sleeved in the sleeve rods, the sleeve rods and the sliding rods are fixedly arranged on the adjacent elastic cloth (5), elastic elements for driving the first telescopic rods (6) to be in an initial state are arranged in the first telescopic rods (6), the elastic elements comprise springs arranged in the cavities of the sleeve rods, the other end of the spring is fixedly arranged on the end of the sliding rod, a damper is sleeved in the spring, one end of the damper is fixedly arranged on the sleeve rod, and the other end of the damper is fixedly arranged on the sliding rod. A circulating pipe is arranged in the noise reduction box (1), the circulating pipe comprises a threaded pipe (7) threaded on the body of the direct current motor (2) and a connecting pipe (8) for connecting two ends of the threaded pipe (7), cooling water is injected into the threaded pipe (7) and the connecting pipe (8), the cooling water fills the connecting pipe (8) and the threaded pipe (7), the length direction of the connecting pipe (8) is parallel to the length direction of the output shaft of the direct current motor (2), a sliding plate (10) is slidingly arranged in the connecting pipe (8), the sliding plate (10) slides along the length direction of the connecting pipe (8), the sliding plate (10) slides to drive the cooling water to flow, and the noise reduction direct current motor is used for converting the noise energy of the direct current motor (2) into kinetic energy of driving the sliding plate (10) to reciprocatingly slide in the connecting pipe (8).

2. A reduced noise DC motor as claimed in claim 1, wherein: The conversion piece includes a second telescopic rod (11) arranged in the noise reduction box (1), the second telescopic rod (11) is of telescopic structure, one end of the second telescopic rod (11) is fixedly arranged on the elastic cloth (5), the other end is fixedly arranged on the side wall of the cavity (3), the first gear (12) is rotatably arranged in the cavity (3), the rack (13) engaged with the first gear (12) is arranged on the sliding rod of the second telescopic rod (11), the elastic cloth (5) drives the sliding rod of the second telescopic rod (11) to slide due to noise vibration, so as to drive the rack (13) to slide and drive the first gear (12) to rotate; the connecting pipe (8) is rotatably arranged with the reciprocating screw rod (14), the sliding plate (10) is threadedly connected on the reciprocating screw rod (14), and the conversion piece further includes a rotating piece for transmitting the reciprocating swing of the first gear (12) to the reciprocating screw rod (14) and driving the reciprocating screw rod (14) to rotate.

3. A reduced noise DC motor as claimed in claim 2, wherein: The rotating piece includes a first toggle lever (15) arranged on the first gear (12), a first driving lever (16) is rotatably arranged in the cavity (3), the length direction of the first driving lever (16) is parallel to the axis direction of the first gear (12), a plurality of first abutting levers (17) are arranged on the first driving lever (16) in the circumferential direction, the first toggle lever (15) is abutted on the first abutting lever (17) and drives the first driving lever (16) to rotate, a second driving lever (18) is rotatably arranged in the noise reduction box (1), the length direction of the second driving lever (18) is parallel to the length direction of the reciprocating screw rod (14), and the first driving lever (16) and the second driving lever (18) and the reciprocating screw rod (14) are provided with the first conveying belt (19).

4. A reduced noise DC motor as claimed in claim 3, wherein: The rotating piece further includes a compensation piece for driving the reciprocating screw rod (14) to rotate after the first toggle lever (15) is separated from the first abutting lever (17).

5. A reduced noise DC motor as claimed in claim 4, wherein: The compensation piece includes a third driving lever (20) rotatably arranged in the cavity (3), the length direction of the third driving lever (20) is parallel to the length direction of the first driving lever (16), the first toggle lever (15) is located between the first driving lever (16) and the third driving lever (20), the second abutting lever (21) abutting with the first toggle lever (15) is arranged on the third driving lever (20), the first toggle lever (15) drives the first driving lever (16) to rotate counterclockwise, and the first toggle lever (15) drives the third driving lever (20) to rotate clockwise; the compensation piece further includes a second gear (22) coaxially arranged on the third driving lever (20), a third gear (23) engaged with the second gear (22) is rotatably arranged in the cavity (3), and the second conveying belt (24) is arranged between the third gear (23) and the reciprocating screw rod (14).

6. A reduced noise DC motor as claimed in claim 5, wherein: The end portions of the first toggle lever (15), the first abutting lever (17) and the second abutting lever (21) for abutting collision are provided with rubber sleeves.

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