Double-layer silencing device and compressor

Abstract

The invention relates to the technical field of compressors, in particular to a double-layer silencing device and a compressor, the double-layer silencing device is arranged on an upper cylinder cover of the compressor in a covering mode, the double-layer silencing device comprises an inner-layer silencer and an outer-layer silencer which are coaxially arranged and tightly attached from inside to outside, the upper cylinder cover is provided with an exhaust hole, and the inner-layer silencer and the outer-layer silencer are arranged in a staggered mode. The wall face, right opposite to the exhaust hole, of the inner-layer silencer is a first inclined face, the first inclined face inclines downwards in the direction away from the center of the inner-layer silencer, a first cavity is defined by the inner-layer silencer and the outer-layer silencer, a second cavity is defined by the upper cylinder cover and the inner-layer silencer, and the first cavity is communicated with the second cavity. The second cavity can slow down jet flow impact noise, the first cavity dissipates energy of the jet flow noise, the first cavity communicates with the second cavity, the space of the first cavity can be increased through the first inclined face, and therefore the noise elimination amount in the first cavity is increased, the noise elimination effect is improved, the first inclined face can play a role in flow guiding, and the noise elimination effect is improved. And the jet flow impact noise in the second cavity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a double-layer muffler device and a compressor. Background Art

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

[0003] To enhance the muffler's effectiveness, some existing compressors utilize a double-layer structure. Exhaust from the upper cylinder head is discharged through the inner muffler cavity into the interlayer between the inner and outer mufflers, and then out of the compression mechanism through this interlayer. This double-layer structure provides a stronger muffler effect than a single-layer muffler. However, the interlayer space between the inner and outer mufflers in this existing structure is very small, resulting in minimal noise attenuation and poor muffler effectiveness.

[0004] Therefore, a double-layer muffler and a compressor are urgently needed to solve the above problems. Summary of the Invention

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

[0006] To achieve this object, the present invention adopts the following technical solutions:

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

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

[0009] As a preferred solution for the double-layer silencer, the first cavity and the second cavity both have multiple lobes and are arranged in a one-to-one correspondence.

[0010] As a preferred solution of the double-layer silencer, the first cavity and the second cavity both have four petals.

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

[0012] As a preferred solution of the double-layer silencer, the outer layer silencer is provided with two second holes, and the two second holes are respectively arranged on two opposite wall surfaces of the outer layer silencer.

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

[0014] As a preferred solution for the double-layer silencer, a buffer step is provided on the top of the outer silencer toward the first cavity.

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

[0016] Another object of the present invention is to provide a compressor capable of reducing noise.

[0017] To achieve this object, the present invention adopts the following technical solutions:

[0018] Provided is a compressor, comprising an upper cylinder head and the above-mentioned double-layer muffler device, wherein a coaxial cover of the double-layer muffler device is arranged on the upper cylinder head and is bolted to the upper cylinder head.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a double-layer muffler, which is mounted on the upper cylinder head of the compressor. The double-layer muffler includes an inner muffler and an outer muffler that are coaxially arranged and tightly fitted. The upper cylinder head is provided with an exhaust hole. The wall of the inner muffler facing the exhaust hole 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 are enclosed to form a first cavity. The upper cylinder head and the inner muffler are enclosed to form a second cavity. The first cavity and the second cavity are connected. The second cavity can reduce the impact noise of the jet flow. The first cavity dissipates the energy of the jet noise. The first cavity and the second cavity are connected. The first inclined surface can increase the space of the first cavity, so the noise reduction amount in the first cavity becomes larger, thereby improving the muffler effect. The first inclined surface can play a guiding role, reduce the flow resistance and reduce the pressure loss of the compressor, thereby improving energy efficiency. At the same time, the first inclined surface can reduce the impact noise of the jet flow in the second cavity.

[0021] The present invention further provides a compressor comprising an upper cylinder head and the above-mentioned double-layer muffler, wherein the double-layer muffler is covered on the upper cylinder head and bolted to the upper cylinder head. The compressor can reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 This is an axonometric view of a double-layer muffler provided by an embodiment of the present invention installed on an upper cylinder head;

[0024] Figure 3 The figure is a graph comparing the noise attenuation of the double-layer silencer provided by the embodiment of the present invention and the silencer of the prior art.

[0025] In the picture:

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

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

[0028] 3. Outer muffler; 301. First cavity; 302. Second hole; 31. Buffer step. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only show portions relevant to the present invention, not all of them.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a double-layer silencer, which is covered on the upper cylinder head 1 of the compressor. The double-layer silencer 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, and the wall of the inner muffler 2 facing the exhaust hole 101 is set as a first inclined surface 21, and 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 are enclosed into a first cavity 301, and the upper cylinder head 1 and the inner muffler 2 are enclosed into a second cavity 201. The first cavity 301 and the second cavity 201 are connected. The second cavity 201 can slow down the jet impact noise, the first cavity 301 can dissipate the energy of the jet noise, the first cavity 301 is connected to the second cavity 201, and the first slope 21 can increase the space of the first cavity 301, so the noise reduction amount in the first cavity 301 becomes larger, thereby improving the noise reduction effect. At the same time, the first slope 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 slope can also slow down the jet impact noise in the second cavity 201.

[0033] In this embodiment, if Figure 1 As shown, the double-layer silencer is used to reduce the noise when the gas refrigerant is discharged from the cylinder. The inner silencer 2 is arranged in the outer silencer 3 to divide the space in the outer silencer 3 into a first chamber 301 and a second chamber 201. The first chamber 301 and the second chamber 201 are connected. The gas refrigerant enters the second chamber 201 through the exhaust hole 101. The second chamber 201 can slow down the jet impact noise, and then enters the first chamber 301 to dissipate the energy, thereby reducing the noise. The wall of the exhaust hole 101 facing the inner silencer 2 is the first slope 21. The first slope 21 can increase the space of the first chamber 301, so that when the gas refrigerant flows through the first chamber 301 for secondary silencer, the silencer volume in certain frequency bands increases. Figure 3 As shown, the double-layer silencer significantly reduces mid-frequency noise. The horizontal axis in the figure represents the noise frequency band, and the vertical axis represents the noise reduction amount. Compared with existing silencers, the double-layer silencer provided in this embodiment can effectively reduce jet noise in the mid-frequency band.

[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 is directly opposite the exhaust hole 101, where the jet impact noise is the largest. The first inclined surface 21 can guide the gas refrigerant, reduce the flow resistance, and reduce the pressure loss of the compressor, thereby forming an energy efficiency advantage. At the same time, the first inclined surface 21 can also slow down the jet impact noise in the second cavity 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., which are not limited here.

[0035] Furthermore, the number of petals of the first cavity 301 and the second cavity 201 are both multi-petal and arranged in a one-to-one correspondence. The first cavity 301 and the second cavity 201 are designed as a multi-petal silencer cavity structure, which can increase the cavity volume of the first cavity 301 and the second cavity 201, thereby increasing the expansion ratio of the gas refrigerant flowing from the inner silencer 2 to the outer silencer 3, thereby increasing the muffler volume and improving the muffler effect. In this embodiment, the number of petals of the first cavity 301 is the same as the number of petals of the second cavity 201 and is arranged in a one-to-one correspondence. Each petal silencer cavity of the first cavity 301 is located in one of the silencer cavities of the second cavity 201 as a whole. In addition, the height of the second cavity 201 is less than the height of the first cavity 301.

[0036] Preferably, the first cavity 301 and the second cavity 201 both have four petals, so as to maximize the space of the first cavity 301 and the second cavity 201 and improve the sound insulation effect.

[0037] Preferably, the inner muffler 2 is provided with a first hole 202, which connects the first chamber 301 and the second chamber 201. The first hole 202 is arranged along the first direction on the wall surface opposite the first inclined surface 21. The first hole 202 connects the first chamber 301 and the second chamber 201. The gas refrigerant enters the second chamber 201 from the exhaust hole 101 and enters the first chamber 301 from the first hole 202 through the diversion effect of the first inclined surface 21. Figure 1 The AB direction in the figure is the first direction. Meanwhile, the first hole 202 is provided on the wall opposite to the first inclined surface 21, which can make the gas refrigerant stay in the second cavity 201 for a longer time, thereby improving the effect of reducing the impact noise of the jet.

[0038] After the gas refrigerant enters the first chamber 301, in order to allow the gas refrigerant to flow out of the first chamber 301, the outer muffler 3 is preferably provided with two second holes 302, which are respectively arranged on two opposing walls of the outer muffler 3. Exhausting the gas refrigerant from the top of the outer muffler 3 may affect other components. Therefore, exhausting the gas refrigerant from the side walls of the outer muffler 3 reduces damage to other components.

[0039] Preferably, the two second holes 302 are arranged along the second direction, and the first direction is perpendicular to the second direction, so that the first hole 202 is located on a perpendicular line connecting the two second holes 302, thereby forming an annular exhaust in the first chamber 301, achieving a better buffering effect for the gas refrigerant and more effectively reducing the generation of eddy currents. Figure 2 The CD direction is the second direction, which is the direction of the line connecting the two second holes 302. In the present invention, the first hole 202 and the second hole 302 can be circular, square or special-shaped. In this embodiment, circular holes are preferred.

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

[0041] Furthermore, the inner muffler 2 is bolted to the outer muffler 3, thereby fixing the inner muffler 2 to the outer muffler 3. In this embodiment, the inner muffler 2 and the outer muffler 3 have the same bottom diameter, but this is not limiting. The edges of the inner muffler 2 and the outer muffler 3 are respectively provided with an annular flange, and the annular flange is provided with bolt holes. The multiple bolt holes are evenly distributed along the circumferential direction. 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, bonding, etc., which are not limited here.

[0042] This embodiment also provides a compressor comprising 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 the upper cylinder head 1. The bottom surface of the inner muffler 2 in the double-layer muffler 1 is aligned with the end surface of the upper cylinder head 1. Bolt holes are respectively provided on the bottom surface of the double-layer muffler and the end surface of the upper cylinder head 1. 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 the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A double-layer silencer, which is mounted on the upper cylinder cover (1) of the compressor, and is characterized in that: The double-layer silencer device comprises an inner silencer (2) and an outer silencer (3) which 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 silencer (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 silencer (2), the inner silencer (2) and the outer silencer (3) are arranged to form a first cavity (301), the upper cylinder head (1) and the inner silencer (2) are arranged to form a second cavity (201), and the first cavity (301) and the second cavity (201) are connected.

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

3. The double-layer muffler device according to claim 2, characterized in that: The first cavity (301) and the second cavity (201) both have multiple petals, which are arranged in a one-to-one correspondence.

4. The double-layer muffler device according to claim 3, characterized in that: The number of petals of the first cavity (301) and the second cavity (201) are both four.

5. The double-layer muffler device according to claim 4, characterized in that: The inner silencer (2) is provided with a first hole (202), the first hole (202) communicating the first cavity (301) and the second cavity (201), the first hole (202) being arranged along a first direction on a wall surface opposite to the first inclined surface (21).

6. The double-layer muffler device according to claim 5, characterized in that: The outer layer muffler (3) is provided with two second holes (302), and the two second holes (302) are respectively arranged on two opposite wall surfaces of the outer layer muffler (3).

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

8. The double-layer muffler device according to any one of claims 1 to 7, characterized in that: A buffer step (31) is provided on the top of the outer layer muffler (3) protruding toward the first chamber (301).

9. The double-layer muffler device according to any one of claims 1 to 7, characterized in that: The inner layer silencer (2) is connected to the outer layer silencer (3) by bolts.

10. A compressor, characterized in that It comprises an upper cylinder head (1) and a double-layer silencer as claimed in any one of claims 1 to 9, wherein a coaxial cover of the double-layer silencer is arranged on the upper cylinder head (1) and is bolted to the upper cylinder head (1).

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