Double-layer silencer and compressor

Abstract

This invention relates to the field of compressor technology, and more particularly to a double-layer silencer and compressor. The double-layer silencer is mounted on the upper cylinder head of the compressor. The double-layer silencer includes an inner silencer and an outer silencer coaxially arranged and tightly fitted from the inside out. The upper cylinder head has an exhaust port. The wall surface of the inner silencer facing the exhaust port is formed by a first inclined surface, which slopes downwards away from the center of the inner silencer. The inner and outer silencers form a first cavity, and the upper cylinder head and the inner silencer form a second cavity. The first and second cavities are connected. The second cavity can reduce jet impact noise, while the first cavity dissipates the energy of the jet noise. The first and second cavities are connected, and the first inclined surface increases the space of the first cavity, thus increasing the noise reduction in the first cavity and improving the silencer effect. Furthermore, the first inclined surface also acts as a guide, reducing the jet impact noise in the second cavity.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a double-layer silencer and compressor. Background Technology

[0002] In the compressor, after high-pressure gas is discharged from the exhaust port on the upper cylinder head, the strong pressure pulsations and airflow impact the exhaust valve plates and the upper cylinder head muffler, generating noise. The cavity of the upper cylinder head muffler forms an expansion chamber, which plays a role in noise reduction.

[0003] To enhance the noise reduction effect of the upper cylinder head muffler, some existing compressors employ a double-layer structure. Exhaust from the upper cylinder head passes through the inner muffler cavity into the space between the inner and outer mufflers, and then exits through this space before exiting the compression mechanism. This double-layer structure provides stronger noise reduction than a single-layer muffler. However, in this existing structure, the space between the inner and outer mufflers is very small, resulting in minimal noise reduction and poor noise reduction performance.

[0004] Therefore, there is an urgent need for a double-layer silencing device and compressor to solve the above problems. Summary of the Invention

[0005] One object of the present invention is to provide a double-layer silencing device that can increase the amount of noise reduction and reduce pressure loss to improve energy efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A double-layer muffler is provided, which is installed on the upper cylinder head of a compressor. The double-layer muffler includes an inner muffler and an outer muffler that are coaxially arranged and tightly fitted from the inside to the outside. The upper cylinder head is provided with an exhaust port. The wall surface of the inner muffler facing the exhaust port is set as a first inclined surface. The first inclined surface is inclined downward in a direction away from the center of the inner muffler. The inner muffler and the outer muffler form a first cavity. The upper cylinder head and the inner muffler form a second cavity. The first cavity and the second cavity are connected.

[0008] As a preferred embodiment of the double-layer silencing device, the angle between the first inclined plane and the horizontal plane is greater than or equal to 10° and less than 90°.

[0009] As a preferred embodiment of the double-layer silencing device, both the first cavity and the second cavity have multiple lobes, and they are arranged in a one-to-one correspondence.

[0010] As a preferred embodiment of the double-layer silencing device, both the first cavity and the second cavity have four lobes.

[0011] As a preferred embodiment of the double-layer silencer, the inner silencer is provided with a first hole, which connects the first cavity and the second cavity. The first hole is disposed on the wall surface opposite to the first inclined surface along a first direction.

[0012] As a preferred embodiment of the double-layer silencer, the outer silencer is provided with two second holes, which are respectively located on two opposite walls of the outer silencer.

[0013] As a preferred embodiment of the double-layer silencing device, the two second holes are arranged along the second direction, and the first direction is perpendicular to the second direction.

[0014] As a preferred embodiment of the double-layer silencer, the top of the outer silencer is provided with a buffer step protruding towards the first cavity.

[0015] As a preferred embodiment of the double-layer silencer device, the inner silencer is bolted to the outer silencer.

[0016] Another object of the present invention is to provide a compressor that can reduce noise.

[0017] To achieve this objective, the present invention adopts the following technical solution:

[0018] A compressor is provided, including an upper cylinder head and the aforementioned double-layer muffler, wherein the double-layer muffler is coaxially mounted on the upper cylinder head and bolted to the upper cylinder head.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a double-layer silencer device, which is installed on the upper cylinder head of a compressor. The double-layer silencer device includes an inner silencer and an outer silencer coaxially arranged and tightly fitted. An exhaust port is provided on the upper cylinder head. The wall surface of the inner silencer facing the exhaust port is formed by a first inclined surface, which slopes downwards away from the center of the inner silencer. The inner and outer silencers form a first cavity, and the upper cylinder head and the inner silencer form a second cavity. The first and second cavities are connected. The second cavity can reduce jet impact noise, while the first cavity dissipates the energy of the jet noise. The first and second cavities are connected, and the first inclined surface increases the space of the first cavity, thus increasing the noise reduction in the first cavity and improving the silencer effect. Furthermore, the first inclined surface acts as a flow guide, reducing flow resistance and decreasing the pressure loss of the compressor, thereby improving energy efficiency. Simultaneously, the first inclined surface can reduce the jet impact noise in the second cavity.

[0021] The present invention also provides a compressor, including an upper cylinder head and the aforementioned double-layer silencer, wherein the double-layer silencer is mounted on the upper cylinder head and bolted to the upper cylinder head. This compressor is capable of reducing noise. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the double-layer muffler provided in this embodiment of the invention installed on the upper cylinder head;

[0023] Figure 2 This is an isometric view of the double-layer muffler device provided in this embodiment of the invention installed on the upper cylinder head;

[0024] Figure 3 This is a comparison curve of the noise reduction of the double-layer silencing device provided in the embodiments of the present invention and the silencing device of the prior art.

[0025] In the picture:

[0026] 1. Upper cylinder head; 101. Exhaust port;

[0027] 2. Inner silencer; 21. First inclined surface; 201. Second cavity; 202. First hole;

[0028] 3. Outer silencer; 301. First cavity; 302. Second hole; 31. Buffer step. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, not all of them.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a double-layer muffler device, which is installed on the upper cylinder head 1 of the compressor. The double-layer muffler device includes an inner muffler 2 and an outer muffler 3 that are coaxially arranged and tightly fitted from the inside to the outside. The upper cylinder head 1 is provided with an exhaust hole 101. The wall surface of the inner muffler 2 facing the exhaust hole 101 is set as a first inclined surface 21. The first inclined surface 21 is inclined downward in a direction away from the center of the inner muffler 2. The inner muffler 2 and the outer muffler 3 form a first cavity 301. The upper cylinder head 1 and the inner muffler 2 form a second cavity 201. The first cavity 301 and the second cavity 201 are connected. The second cavity 201 can reduce jet impact noise, and the first cavity 301 can dissipate the energy of jet noise. The first cavity 301 is connected to the second cavity 201, and the first inclined surface 21 can increase the space of the first cavity 301. Therefore, the noise reduction in the first cavity 301 is increased, thereby improving the noise reduction effect. At the same time, the first inclined surface 21 can guide the gas refrigerant in the second cavity 201, reduce the flow resistance and reduce the pressure loss of the compressor, thereby improving energy efficiency. The first inclined surface can also reduce jet impact noise in the second cavity 201.

[0033] In this embodiment, as Figure 1 As shown, the double-layer muffler is used to reduce the noise when gaseous refrigerant is discharged from the cylinder. The inner muffler 2 is located inside the outer muffler 3 to divide the space inside the outer muffler 3 into a first chamber 301 and a second chamber 201. The first chamber 301 and the second chamber 201 are connected. The gaseous refrigerant enters the second chamber 201 through the exhaust port 101. The second chamber 201 can reduce the jet impact noise. Then it enters the first chamber 301, where energy is dissipated, thereby reducing the noise. The wall surface of the exhaust port 101 facing the inner muffler 2 is a first inclined surface 21. The first inclined surface 21 can increase the space of the first chamber 301, so that when the gaseous refrigerant flows through the first chamber 301 for secondary silencing, the silencing amount in certain frequency bands is increased. Figure 3 As shown, this double-layer silencing device significantly reduces mid-frequency noise. The horizontal axis in the figure represents the noise frequency band, and the vertical axis represents the noise reduction level. Compared with existing silencing devices, the double-layer silencing device provided in this embodiment can effectively reduce mid-frequency jet noise.

[0034] Preferably, the angle between the first inclined surface 21 and the horizontal plane is greater than or equal to 10° and less than 90°. The first inclined surface 21 faces the exhaust port 101, where the jet impact noise is greatest. The first inclined surface 21 can guide the flow of gaseous refrigerant, reducing flow resistance and thus reducing the pressure loss of the compressor, thereby improving energy efficiency. At the same time, the first inclined surface 21 can also reduce the jet impact noise in the second chamber 201. In this embodiment, the angle between the first inclined surface 21 and the horizontal plane is 45°. In other embodiments, the angle between the first inclined surface 21 and the horizontal plane can also be 10°, 23°, 30°, 50°, 60°, 70°, 89°, etc., and is not limited here.

[0035] Furthermore, both the first cavity 301 and the second cavity 201 have multiple lobes, arranged in a one-to-one correspondence. The first cavity 301 and the second cavity 201 are designed as multi-lobed silencing cavity structures, which increases the cavity volume of both cavities, thereby increasing the expansion ratio of the gas refrigerant flowing from the inner silencer 2 to the outer silencer 3, thus increasing the noise reduction and improving the silencing effect. In this embodiment, the number of lobes in the first cavity 301 is the same as the number of lobes in the second cavity 201, and they are arranged in a one-to-one correspondence. Each silencing cavity lobe of the first cavity 301 is entirely located within one of the silencing cavities of the second cavity 201. Additionally, the height of the second cavity 201 is less than the height of the first cavity 301.

[0036] Preferably, both the first cavity 301 and the second cavity 201 have four lobes to maximize the space between the first cavity 301 and the second cavity 201 and improve the sound absorption effect.

[0037] Preferably, the inner silencer 2 is provided with a first hole 202, which connects the first cavity 301 and the second cavity 201. The first hole 202 is disposed on the wall surface opposite to the first inclined surface 21 along a first direction. The first hole 202 connects the first cavity 301 and the second cavity 201. Gas refrigerant enters the second cavity 201 from the exhaust hole 101 and enters the first cavity 301 from the first hole 202 after being guided by the first inclined surface 21. Figure 1 The AB direction is the first direction. At the same time, the first hole 202 is set on the wall opposite to the first inclined surface 21, which allows the gas refrigerant to stay in the second cavity 201 for a longer time, thus improving the effect of reducing jet impact noise.

[0038] After the gaseous refrigerant enters the first chamber 301, in order to allow the gaseous refrigerant to flow out of the first chamber 301, preferably, the outer muffler 3 is provided with two second holes 302, which are respectively located on two opposite walls of the outer muffler 3. Since the gaseous refrigerant may affect other components if it is discharged from the top of the outer muffler 3, exhaust is provided on the side walls of the outer muffler 3 to reduce damage to other components.

[0039] Preferably, the two second holes 302 are arranged along a second direction, with the first direction perpendicular to the second direction. This positions the first hole 202 on the perpendicular line connecting the two second holes 302, thereby forming an annular exhaust within the first cavity 301. This improves the buffering effect of the gas refrigerant and effectively reduces the generation of eddies. Figure 2 The CD direction is the second direction, which is the direction of the line connecting the two second holes 302. In this invention, the shape of the first hole 202 and the second hole 302 can be a circular hole, a square hole, or an irregularly shaped hole, etc. In this embodiment, a circular hole is preferred.

[0040] Furthermore, a buffer step 31 protrudes from the top of the outer silencer 3 toward the first cavity 301. The buffer step 31 can further reduce the pressure pulsation and aerodynamic noise of the gas refrigerant, and reduce the noise generated when the gas refrigerant is discharged from the outer silencer 3 from the inside to the outside.

[0041] Furthermore, the inner muffler 2 and the outer muffler 3 are bolted together, thus fixing the inner muffler 2 and the outer muffler 3. In this embodiment, the bottom diameters of the inner muffler 2 and the outer muffler 3 are the same, but this is not a limitation. The edges of the inner muffler 2 and the outer muffler 3 are respectively provided with annular flanges, and bolt holes are provided on the annular flanges. Multiple bolt holes are equidistantly distributed along the circumference. The inner muffler 2 and the outer muffler 3 are connected using a first bolt. In other embodiments, the inner muffler 2 and the outer muffler 3 may also use other connection methods, such as welding or bonding, which are not limited here.

[0042] This embodiment also provides a compressor, including an upper cylinder head 1 and the aforementioned double-layer muffler. The double-layer muffler is coaxially mounted on the upper cylinder head 1 and bolted to it. The bottom surface of the inner muffler 2 in the double-layer muffler is in contact with the end face of the upper cylinder head 1. Bolt holes are provided on the bottom surface of the double-layer muffler and the end face of the upper cylinder head 1, respectively. The double-layer muffler and the upper cylinder head 1 are connected by a second bolt. This compressor can reduce noise and pressure loss, thereby improving energy efficiency.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A double-layer silencer, mounted on the upper cylinder cover (1) of the compressor, characterized in that, The double-layer muffler includes an inner muffler (2) and an outer muffler (3) that are coaxially arranged and tightly fitted from the inside to the outside. The upper cylinder head (1) is provided with an exhaust port (101). The wall surface of the inner muffler (2) facing the exhaust port (101) is set as a first inclined surface (21). The first inclined surface (21) is inclined downward in a direction away from the center of the inner muffler (2). The inner muffler (2) and the outer muffler (3) form a first cavity (301). The upper cylinder head (1) and the inner muffler (2) form a second cavity (201). The first cavity (301) and the second cavity (201) are connected. The inner silencer (2) is provided with a first hole (202), which connects the first cavity (301) and the second cavity (201). The first hole (202) is disposed on the wall surface opposite to the first inclined surface (21) along the first direction.

2. The double-layer silencing device according to claim 1, characterized in that, The angle between the first inclined plane (21) and the horizontal plane is greater than or equal to 10° and less than 90°.

3. The double-layer silencing device according to claim 2, characterized in that, Both the first cavity (301) and the second cavity (201) have multiple lobes, and they are configured in a one-to-one correspondence.

4. The double-layer silencing device according to claim 3, characterized in that, Both the first cavity (301) and the second cavity (201) have four lobes.

5. The double-layer silencing device according to claim 1, characterized in that, The outer silencer (3) is provided with two second holes (302), which are respectively located on two opposite wall surfaces of the outer silencer (3).

6. The double-layer silencing device according to claim 5, characterized in that, The two second holes (302) are arranged along a second direction, and the first direction is perpendicular to the second direction.

7. The double-layer silencing device according to any one of claims 1-6, characterized in that, The top of the outer silencer (3) is provided with a buffer step (31) protruding towards the first cavity (301).

8. The double-layer silencing device according to any one of claims 1-6, characterized in that, The inner silencer (2) is bolted to the outer silencer (3).

9. A compressor, characterized in that, It includes an upper cylinder head (1) and a double-layer muffler as described in any one of claims 1-8, wherein the double-layer muffler is coaxially mounted on the upper cylinder head (1) and bolted to the upper cylinder head (1).

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