Compressor front cover and compressor

Abstract

The present invention provides a compressor front cover and a compressor, wherein the compressor front cover comprises a cover body having an inlet, an outlet and an oil distribution channel, an oil distribution pipe connected to the outlet is arranged in the oil distribution channel, a sound absorption hole, the oil distribution channel and the oil distribution pipe form a sound absorption structure, and resonance is caused when the noise frequency of the compressor exhaust gas is the same as the resonance frequency of the sound absorption structure. Compared with the prior art, the compressor front cover provided by the present invention has a sound absorption hole on the oil distribution channel of the cover body, and the sound absorption hole, the oil distribution channel and the oil distribution pipe form a sound absorption structure, and the sound energy is converted into heat energy through the resonance of the noise gas and the sound absorption structure, thereby achieving the purpose of reducing noise and improving the human ear's experience of the good sound quality of the working compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and more specifically, relates to a compressor front cover and a compressor. Background Art

[0002] With the rapid development of science and technology, many devices are constantly improving with the development of science and technology. During the operation of the equipment, it is inevitable that certain noise will be generated, causing noise pollution to the surrounding environment.

[0003] For the noise test of new energy vehicle compressors, the national standard requires that tests be conducted in three directions: the compressor motor, top of the controller, and the front cover to evaluate the noise level of the entire machine.

[0004] When the gas passes through the oil distribution channel of the front cover, noise is generated due to airflow noise and the large pressure pulsation caused by the volume change of the gas ejected from the high-pressure chamber of the compressor. Summary of the invention

[0005] The object of the present invention is to provide a compressor front cover and a compressor, so as to solve the problem in the prior art that the gas generates a large noise when passing through the oil separation channel of the front cover.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a compressor front cover, including a cover body with an inlet, an outlet and an oil distribution channel, an oil distribution pipe connected to the outlet is arranged in the oil distribution channel, the sound absorption hole and the oil distribution pipe and the oil distribution channel form a sound absorption structure, and resonance is caused when the noise frequency of the compressor exhaust gas is the same as the resonance frequency of the sound absorption structure.

[0007] Furthermore, the resonant frequency is , c is the speed of sound, α is the perforation rate, h is the diameter of the oil separation channel, k is the effective diameter of the sound absorbing hole, and when the aperture d of the sound absorbing hole is greater than the wall thickness t, k=t+0.8d.

[0008] Preferably, the sound absorbing holes are distributed in a triangular, circular or rectangular shape.

[0009] Preferably, when the sound absorbing holes are distributed in a circular or rectangular shape, the perforation rate α=π / 4*(d / l)², d is the aperture of the sound absorbing hole, and l is the distance between the sound absorbing holes.

[0010] Preferably, when the sound-absorbing holes are distributed in a triangular shape, the perforation rate α=π / 2 *(d / l)², d is the aperture of the sound absorbing hole, l is the distance between the sound absorbing holes.

[0011] Preferably, the shape of the sound absorbing hole is circular or elliptical.

[0012] Preferably, the sound absorbing holes are evenly distributed on the oil separation channel.

[0013] Preferably, the cross-sectional sizes of the air inlet and the air outlet of the sound absorbing hole are different.

[0014] Preferably, the spacing between adjacent sound absorbing holes is in the range of 6 mm ≤ 1 ≤ 10 mm.

[0015] Another object of the present invention is to provide a compressor, comprising the above-mentioned compressor front cover, wherein the pressure in the inner cavity of the compressor is greater than the pressure in the oil separation channel.

[0016] The beneficial effect of the compressor front cover provided by the present invention is that: compared with the prior art, the present invention opens sound absorption holes on the oil distribution channel of the cover body, and the sound absorption holes and the oil distribution pipe form a sound absorption structure. The sound energy is converted into heat energy through resonance between the noise gas and the sound absorption structure, thereby achieving the purpose of reducing noise and improving the human ear's experience of the good sound quality of the working compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a compressor front cover provided by an embodiment of the present invention, with some structures not shown;

[0019] Figure 2 A cross-sectional schematic diagram of a compressor front cover provided by an embodiment of the present invention, with some structures not shown;

[0020] Figure 3 A schematic cross-sectional view of a compressor front cover from another perspective provided by an embodiment of the present invention, with some structures not shown.

[0021] Among them, the main marks of the drawings in the figure are:

[0022] 1. Inlet; 2. Outlet; 3. Oil distribution channel; 4. Sound absorption hole; 5. Oil distribution pipe. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Please also read Figures 1 to 3, the compressor front cover provided by the embodiment of the present invention is now described. The compressor front cover includes a cover body, and the cover body is provided with an inlet 1, an outlet 2 and an oil separation channel 3. The oil separation channel 3 is provided with a plurality of sound absorption holes 4, and an oil separation pipe 5 is provided in the oil separation channel 3. The oil separation pipe 5 is connected with the outlet 2, and the sound absorption holes 4 and the oil separation channel 3 and the oil separation pipe 5 form a sound absorption structure. The refrigerant enters the oil separation channel 3 from the inlet 1 and the sound absorption hole 4, and is discharged from the outlet 2 through the oil separation pipe 5 after silencing. When the frequency of the gas noise discharged by the compressor is the same as the resonant frequency of the sound absorption structure, resonance is caused. When resonance occurs, the refrigerant at the sound absorption hole 4 reciprocates, and the speed and amplitude of the refrigerant reach the maximum, and the friction and damping also reach the maximum. Therefore, a large amount of sound energy will be converted into heat energy, thereby effectively reducing the noise of the compressor.

[0025] Compared with the prior art, the compressor front cover provided by the present invention has sound absorption holes 4 on the oil separation channel 3 of the cover body. The sound absorption holes 4, the oil separation channel 3 and the oil separation pipe 5 form a sound absorption structure. The sound energy is converted into heat energy through resonance between the noise gas and the sound absorption structure, thereby achieving the purpose of reducing noise and improving the human ear's experience of the good sound quality of the working compressor.

[0026] Specifically, the sound absorption hole 4, the oil separation channel 3, and the oil separation pipe 5 not only have the above-mentioned good effect of reducing noise, but also the refrigerant enters the oil separation channel 3 from the inlet 1 and the sound absorption hole 4 at the same time. Among them, the refrigerant contains a certain amount of lubricating oil when entering the inlet 1 and the sound absorption hole 4. The lubricating oil is liquid and heavier than the gaseous refrigerant. The sound absorption hole 4 has a certain blocking effect on the lubricating oil, and the lubricating oil is more difficult to enter the sound absorption hole 4. Therefore, the sound absorption hole 4 has a good oil blocking effect when the refrigerant enters. Reduce the oil content of the compressor exhaust.

[0027] Further, as a specific embodiment of the compressor front cover provided by the present invention, the resonance frequency is , c is the speed of sound, where the speed of sound refers to the speed at which noise propagates with a refrigerant containing a small amount of refrigeration oil as the medium, α is the perforation rate, h is the diameter of the oil separation channel 3, and k is the effective diameter length of the sound absorption hole 4. When the aperture d of the sound absorption hole 4 is greater than the wall thickness t, k=t+0.8d. Therefore, once the parameters of the oil separation channel 3, the oil separation pipe 5 and the sound absorption hole 4 are determined, the resonance frequency and sound absorption frequency of the sound absorption structure are also determined.

[0028] Preferably, please also refer to Figure 1 and Figure 2 As a specific embodiment of the compressor front cover provided by the present invention, the sound absorption holes 4 are distributed in the shape of, but not limited to, triangle, circle or rectangle.

[0029] Preferably, as a specific embodiment of the compressor front cover provided by the present invention, since the perforation rate α=S 1 / S, that is, the ratio of the area of ​​the hole to the total area. Therefore, when the sound-absorbing holes 4 are distributed in a circular or rectangular shape, the perforation rate α=π / 4*(d / l)², where d is the aperture of the sound-absorbing hole 4 and l is the distance between the sound-absorbing holes 4.

[0030] Preferably, as a specific embodiment of the compressor front cover provided by the present invention, since the perforation rate α=S 1 / S, that is, the ratio of the hole area to the total area. Therefore, when the sound-absorbing holes 4 are distributed in a triangle, the perforation rate α=π / 2 *(d / l)², where d is the aperture of the sound absorbing hole 4 and l is the distance between the sound absorbing holes 4.

[0031] Preferably, please also refer to Figure 1 and Figure 2 As a specific embodiment of the compressor front cover provided by the present invention, the shape of the sound absorbing hole 4 includes but is not limited to a circle or an ellipse.

[0032] Preferably, as a specific embodiment of the compressor front cover provided by the present invention, the sound absorption holes 4 are evenly distributed on the oil separation channel 3, which helps to improve the elimination of noise.

[0033] Preferably, as a specific embodiment of the compressor front cover provided by the present invention, the cross-sectional sizes of the air inlet and the air outlet of the sound absorption hole 4 are different, and the sizes of the air inlet and the air outlet are determined according to the frequency of the noise that actually needs to be reduced. Of course, in other embodiments, the cross-sectional sizes of the air inlet and the air outlet of the sound absorption hole 4 can also be designed to be the same.

[0034] Preferably, as a specific embodiment of the compressor front cover provided by the present invention, the diameter of the sound absorption hole 4 is d=2 mm. Of course, in other embodiments, the diameter of the sound absorption hole 4 can also be selected according to actual conditions and needs. The diameter of the sound absorption hole 4 is determined according to the actual structure and size of the oil separation channel 3 and the frequency of the noise to be reduced.

[0035] Preferably, as a specific embodiment of the compressor front cover provided by the present invention, the spacing range of adjacent sound absorption holes 4 is 6mm≤l≤10mm, wherein when d=2mm, l=8mm, the noise of 503Hz can be reduced, and the overall noise of the compressor can be reduced by 2 to 4dB.

[0036] The present invention also provides a compressor, comprising the above-mentioned compressor front cover, wherein the pressure of the compressor cavity is greater than the pressure in the oil separation channel 3, wherein the compressor cavity usually refers to the exhaust chamber of the compressor.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressor front cover, comprising a cover body having an inlet, an outlet and an oil separation channel, characterized in that: a plurality of sound absorption holes are formed in the oil separation channel, the sound absorption holes are distributed in a triangular, circular or rectangular shape, the sound absorption holes are evenly distributed on the oil separation channel, an oil separation pipe communicating with the outlet is arranged in the oil separation channel, and the sound absorption holes, the oil separation channel and the oil separation pipe form a sound absorption structure, and resonance is caused when the noise frequency of the gas discharged by the compressor is the same as the resonance frequency of the sound absorption structure; the refrigerant enters the oil separation channel from the inlet and the sound absorption holes, and after silencing, is discharged from the outlet through the oil separation pipe.

2. The compressor front cover according to claim 1, characterized in that: The resonant frequency is c is the speed of sound, α is the perforation rate, h is the diameter of the oil separation channel, k is the effective diameter length of the sound absorbing hole, and when the hole diameter d of the sound absorbing hole is greater than the wall thickness t, k=t+0.8d.

3. The compressor front cover according to claim 1, characterized in that: when the sound absorption holes are distributed in a circular or rectangular shape, the perforation rate α = π / 4*(d / l)2, where d is the aperture of the sound absorption hole and l is the distance between the sound absorption holes.

4. The compressor front cover according to claim 1, characterized in that: When the sound-absorbing holes are distributed in a triangular shape, the perforation rate d is the aperture of the sound absorbing hole, and l is the distance between the sound absorbing holes.

5. The compressor front cover according to claim 1, characterized in that: the shape of the sound absorption hole is circular or oval.

6. The compressor front cover according to claim 1, characterized in that: the cross-sectional sizes of the air inlet and the air outlet of the sound absorption hole are different.

7. The compressor front cover according to claim 1, characterized in that: the spacing range between adjacent sound absorption holes is 6mm ≤ l ≤ 10mm.

8. A compressor, characterized in that: it includes the compressor front cover according to any one of claims 1-7, and the pressure in the cavity of the compressor is greater than the pressure in the oil separation channel.

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