Low-noise air compressor

Abstract

The low-noise air compressor comprises a motor and a compression pump, the motor comprises a machine shell, a stator, a rotor and an output shaft, the stator, the rotor and the output shaft are arranged in the machine shell, an air inlet is formed in the machine shell, a compressed air outlet is formed in the compression pump, and the machine shell is located on the left side of the compression pump. The motor further comprises a first silencing element arranged on the output shaft in a sleeving mode and located on the left side of the rotor and a second silencing element arranged on the output shaft in a sleeving mode and located on the right side of the rotor, and the first silencing element and the second silencing element are each provided with main silencing holes which are through in the left-right direction. The shell of the motor is utilized, the air inlet is designed at the left end of the shell of the motor, and air coming out of the air outlet side of the motor enters the compression pump to be compressed, so that pneumatic noise of the air inlet is obviously improved after passing through the first silencing element and the second silencing element, and the whole size of the compressor is relatively small.

Description

Technical Field

[0001] The utility model belongs to the field of air spring accessories, and in particular relates to a low-noise air compressor. Background Art

[0002] Currently, air compressors used in the air supply systems of automobile air suspension systems generally suffer from high vibration noise. To reduce the vibration noise during air compressor inflating, an acoustic package is generally added to the outside of the air compressor, completely enclosing the compressor. However, while the acoustic package effectively suppresses the mid- and high-frequency noise generated by the air compressor during operation, it has little effect on suppressing the low-frequency vibration noise during compressor operation. Low-order gas pulsation noise generated by the air compressor during compression and low-order vibration noise generated by the operation of the drive shaft and piston have a significant impact on the ride comfort of passengers in the vehicle. The unbalanced forces generated by the moving parts of the compressor can be minimized by adding an eccentric mass block, but the eccentric mass block can only optimize the low-order vibration characteristics of the air compressor and has little effect on the low-order gas pulsation noise generated during operation. Adding a muffler to the external piping of the air compressor has very limited effect on optimizing the vibration noise of the air compressor itself. In order to reduce the noise during the intake and exhaust of the air suspension system, a muffler can be added to the air supply pipeline. This will also increase the cost. In addition, the motors of some air compressors will also generate large electromagnetic noise or carbon brush friction noise, etc., and the external muffler has almost no noise reduction effect. Summary of the Invention

[0003] The purpose of the utility model is to provide a low-noise air compressor which can effectively reduce noise and has a small overall volume.

[0004] To solve the above technical problems, the present utility model adopts the following technical solution: a low-noise air compressor, which includes a motor and a compression pump, the motor includes a casing, a stator, a rotor and an output shaft arranged in the casing, the casing is provided with an air inlet, the compression pump is provided with a compressed air outlet, the casing is located on the left side of the compression pump, and the motor further includes: a first silencer element sleeved on the output shaft and located on the left side of the rotor, a second silencer element sleeved on the output shaft and located on the right side of the rotor, and the first silencer element and the second silencer element are respectively provided with main silencer holes that pass through left and right.

[0005] In another embodiment, the main body of the first silencer element is annular, and a first rib, a second rib, and a third rib are formed on its right end face, wherein a main silencer hole is formed on the end face between the first rib and the second rib, which passes through the left and right sides.

[0006] In another embodiment, a connecting plate connecting the second rib and the third rib is formed on the right end surface between the second rib and the third rib, and the connecting plate is arc-shaped and is coaxially arranged with the first silencer element.

[0007] In another embodiment, the end surface of the first silencer element on the outer side of the connecting plate is recessed axially toward the first silencer element to form an arc-shaped clearance groove.

[0008] In another embodiment, a secondary muffler hole perpendicular to the axis of the main muffler hole is formed on the first rib.

[0009] In another embodiment, a plurality of first connection holes for fixed connection with the housing are provided on the end surface of the first sound-absorbing element.

[0010] In another embodiment, the main muffler holes on the second muffler element are evenly distributed on the end surface thereof.

[0011] In another embodiment, a plurality of second connection holes for fixed connection with the housing are provided on the end surface of the second sound-absorbing element.

[0012] In another embodiment, the low-noise air compressor further includes a drying chamber connected to the compression pump, wherein an air flow path that rotates up and down is provided in the drying chamber.

[0013] In another embodiment, the left side of the first sound-absorbing element and / or the right side of the second sound-absorbing element are filled with sound-absorbing material.

[0014] The beneficial effect of the present invention is that the present invention utilizes the housing of the motor and designs the air inlet at the left end of the motor housing. The gas coming out from the air outlet side of the motor then enters the compression pump for compression. In this way, the aerodynamic noise of the air inlet will be significantly improved after passing through the first silencer element and the second silencer element, and the overall volume of the compressor is ensured to be small. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of the utility model;

[0016] Figure 2 for Figure 1 Cross-sectional view AH-AH;

[0017] Figure 3 is a perspective view of a first muffler element;

[0018] Figure 4 It is a three-dimensional diagram of the second muffler element. DETAILED DESCRIPTION

[0019] The following is a detailed description of the present invention in conjunction with the embodiments shown in the accompanying drawings:

[0020] like Figure 1-2 As shown, the low-noise air compressor includes a motor 1 and a compression pump 2. The motor 1 includes a casing 17, a stator 18 arranged in the casing, a rotor 19 and an output shaft 20. The casing is provided with an air inlet 4, and the compression pump 2 is provided with a compressed air outlet. The casing is located on the left side of the compression pump 2. The motor 1 also includes: a first silencer element 6 sleeved on the output shaft and located on the left side of the rotor, a second silencer element 7 sleeved on the output shaft and located on the right side of the rotor, and the first silencer element 6 and the second silencer element 7 are respectively provided with a main silencer hole 8 that passes through the left and right sides.

[0021] Specifically, if Figure 3 As shown, the main body of the first silencer element 6 is annular, with a first rib 9, a second rib 10, and a third rib 11 formed on its right end surface. A main silencer hole 8 extending from left to right is formed on the end surface between the first rib 9 and the second rib 10. A connecting plate 12 connecting the second rib 10 and the third rib 11 is formed on the right end surface between the second rib 10 and the third rib 11. The connecting plate 12 is arc-shaped and coaxially arranged with the first silencer element 6. The end surface of the first silencer element 6 outside the connecting plate 12 is axially recessed to form an arc-shaped clearance groove 13. A secondary silencer hole 14 is formed on the first rib 9 and is perpendicular to the axis of the main silencer hole 8. A plurality of first connecting holes 15 for fixed connection to the housing are provided on the end surface of the first silencer element 6.

[0022] like Figure 4 As shown, the primary muffler holes 8 on the second muffler element 7 are evenly distributed on its end surface. The end surface of the second muffler element 7 is provided with a plurality of second connection holes 16 for fixed connection to the housing. The low-noise air compressor also includes a drying chamber 3 connected to the air outlet of the compression pump 2. The drying chamber 3 has an air flow path that rotates up and down, and an air outlet 5 is provided on the drying chamber 3. The left side of the first muffler element 6 and / or the right side of the second muffler element 7 are filled with sound-absorbing material 21.

[0023] A first muffler element 6 and a second muffler element 7 are installed on either side of the motor 1 rotor, isolating the motor 1 housing into three sections: the air intake side serves as the first muffler chamber A, the chamber containing the intermediate rotor serves as the second muffler chamber B, and the motor 1 outlet side serves as the third muffler chamber C. The first and second muffler elements 6 and 7 can be fixed within the chambers using pre-retained bolts within the motor 1 housing, enabling embedded installation and easy removal. The muffler elements can be designed based on the noise characteristics of the air compressor. The muffler frequency can be adjusted by adjusting the direction of the air duct within the muffler element, the number and diameter of the muffler holes, and other factors. The muffler elements also provide a certain shielding effect on electromagnetic and mechanical noise generated by the rotor and stator. Sound-absorbing materials can also be installed within the first and third muffler chambers on the motor 1 side to enhance the sound absorption effect. When the air suspension system is exhausted, high-pressure, high-flow gas is blown back into the motor 1. As the airflow passes through the muffler elements within the motor 1, the high-frequency airflow noise is effectively suppressed.

[0024] The embodiments described above are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A low-noise air compressor comprising a motor and a compression pump, wherein the motor comprises a housing, a stator, a rotor and an output shaft arranged in the housing, the housing is provided with an air inlet, the compression pump is provided with a compressed air outlet, the housing is located on the left side of the compression pump, and is characterized in that: The motor further includes: a first muffler element sleeved on the output shaft and located on the left side of the rotor, and a second muffler element sleeved on the output shaft and located on the right side of the rotor, wherein the first muffler element and the second muffler element are respectively provided with a main muffler hole extending through the left and right sides.

2. The low-noise air compressor according to claim 1, characterized in that: The first muffler element body is annular, with a first rib, a second rib, and a third rib formed on its right end surface, wherein a main muffler hole is formed on the end surface between the first rib and the second rib, which passes through the left and right sides.

3. The low-noise air compressor according to claim 2, characterized in that: A connecting plate connecting the second rib and the third rib is formed on the right end surface between the second rib and the third rib. The connecting plate is arc-shaped and is coaxially arranged with the first muffler element.

4. The low-noise air compressor according to claim 3, characterized in that: The end surface of the first muffler element on the outer side of the connecting plate is recessed axially toward the first muffler element to form an arc-shaped clearance groove.

5. The low-noise air compressor according to claim 2, characterized in that: The first rib is formed with an auxiliary muffler hole perpendicular to the axis of the main muffler hole.

6. The low-noise air compressor according to claim 1, characterized in that: A plurality of first connection holes for fixed connection with the housing are provided on the end surface of the first muffler element.

7. The low-noise air compressor according to claim 1, characterized in that: The main muffler holes on the second muffler element are evenly distributed on the end surface thereof.

8. The low-noise air compressor according to claim 1, characterized in that: A plurality of second connection holes for fixed connection with the housing are provided on the end surface of the second muffler element.

9. The low-noise air compressor according to claim 1, characterized in that: The low-noise air compressor further comprises a drying chamber connected to the compression pump, wherein an air flow path rotating up and down is provided in the drying chamber.

10. The low-noise air compressor according to claim 1, characterized in that: The left side of the first sound-absorbing element and / or the right side of the second sound-absorbing element are filled with sound-absorbing material.

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