Double-layer silencer capable of stabilizing oil level and compressor

Abstract

The double-layer silencer comprises a silencer inner layer and a silencer outer layer, an annular edge is arranged on the periphery of the bottom of the double-layer silencer, the silencer inner layer and the silencer outer layer are respectively connected with the annular edge, an exhaust port is formed in the silencer inner layer, an exhaust hole is formed in the silencer outer layer, and the silencer inner layer and the silencer outer layer are respectively connected with the annular edge. The upper portion of the silencer outer layer serves as a ventilation cavity, an inner silencing cavity is defined by the silencer inner layer, a main body of the upper cylinder cover and a center shaft of the upper cylinder cover, an outer silencing cavity is defined by the silencer outer layer, the silencer inner layer and the center shaft of the upper cylinder cover, and the ventilation cavity is communicated with the inner silencing cavity and the outer silencing cavity through an exhaust port and an exhaust hole. The annular edge is outwards provided with a flange, an oil discharge groove is formed in the root of the flange in the circumferential direction of the flange, and on the plane perpendicular to the axis of the double-layer silencer, the projection of the oil discharge groove and the projection of the through-flow hole in the edge of the upper cylinder cover are partially intersected or completely not overlapped. Compared with the prior art, on one hand, the noise of the compressor can be reduced, and on the other hand, the oil level of the compressor can be stabilized.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration compressor technology, and relates to a double-layer silencer and compressor that can stabilize the oil level. Background Technology

[0002] Currently, refrigeration compressors are developing towards high speed and miniaturization through variable frequency technology, resulting in increasingly wider operating speed ranges. This high-speed miniaturization of variable frequency compressors not only leads to frequent compressor noise issues but also causes problems such as rapid fluctuations and drops in the oil level in the compressor's internal lubricating oil sump. As the speed increases, the lubricating oil at the bottom of the motor is carried by the high-speed refrigerant airflow to the top of the motor and accumulates there. A small portion of the lubricating oil that cannot be separated in time is discharged from the compressor with the refrigerant; most of the lubricating oil separates from the refrigerant and flows down the inner wall of the casing through the microchannel formed between the outer diameter of the motor and the inner diameter of the casing, returning to the oil sump at the bottom of the compressor. If the oil level in the sump is too high, the lubricating oil is easily agitated by the high-speed airflow discharged from the pump body. The exhaust flow field easily causes the airflow to carry a large amount of lubricating oil, which enters the top of the motor more quickly. The higher the motor speed, the greater the pulsation of the airflow discharged from the bottom of the motor, obstructing the downward flow channel of the lubricating oil in the top of the motor, causing poor oil return, a rapid drop in the oil level in the sump, and consequently affecting the lubrication and long-term reliability of the compressor pump body.

[0003] Patent CN114593054A discloses a roller compressor and refrigeration equipment, wherein the muffler housing has an extension surrounding the muffler cavity; the wall of the storage space of the extension is used to guide the oil separated from the oil-gas to the oil tank; the storage space of the extension is an annular bowl groove surrounding the muffler cavity, and the oil tank is the bottom of the annular bowl groove; the bottom of the oil tank has a through hole, and the oil in the oil tank flows into the oil passage under the action of gravity and enters the corresponding surface between the slider and the first bearing device. However, the annular bowl groove design of this patent is only used to guide the oil separated from the oil-gas to the oil passage for lubricating the slider, and does not have the function of guiding the oil separated from the oil-gas back to the oil tank.

[0004] Patent CN117072447A discloses an air conditioner, a compressor, and a silencer structure. The silencer includes an annular plate and an upwardly projecting structure from the inner circumference of the annular plate, the upwardly projecting structure having a through-hole. The silencer is fitted onto a neck via the through-hole, and a silencer cavity is formed between the upper outer circumference of the upwardly projecting structure, the annular plate, and the flange portion. An oil reservoir is formed on the side of the upwardly projecting structure opposite to the flange portion. The device also includes a second silencer, which includes a second annular plate and a second upwardly projecting structure from the inner circumference of the second annular plate, the second upwardly projecting structure having a through-hole. The second silencer is fitted onto the neck via the second inner hole, and a second silencer cavity is formed between the outer circumference of the neck, the second upwardly projecting structure, and the upwardly projecting structure. The oil reservoir is formed on the side of the second upwardly projecting structure opposite to the upwardly projecting structure. A silencer channel is formed on the upwardly projecting structure connecting the silencer cavity and the second silencer cavity. However, the patent's double-layer design cannot prevent the high-speed exhaust flow field from disturbing the oil surface of the external oil sump of the pump body. Utility Model Content

[0005] The purpose of this invention is to overcome at least one of the defects in the prior art and provide a double-layer silencer and compressor that can stabilize the oil level. This invention can reduce compressor noise and stabilize the compressor oil level.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] One of the technical solutions of this utility model is to provide a double-layer muffler that can stabilize the oil level. The double-layer muffler includes an inner muffler layer and an outer muffler layer. A ring edge is provided on the outer periphery of the bottom of the double-layer muffler. The inner muffler layer and the outer muffler layer are respectively connected to the ring edge. An exhaust port is provided on the inner muffler layer, and an exhaust hole is provided on the outer muffler layer. The upper part of the outer muffler layer serves as a ventilation chamber. The inner muffler layer, the main body of the upper cylinder head, and the central axis of the upper cylinder head form an inner muffler chamber. The outer muffler layer, the inner muffler layer, and the central axis of the upper cylinder head form an outer muffler chamber. The ventilation chamber communicates with the inner muffler chamber and the outer muffler chamber through the exhaust port and the exhaust hole.

[0008] The ring edge is provided with a flange on the outward side. The flange is used to isolate the high-speed airflow discharged from the pump body and the lubricating oil flowing down the inner wall of the casing, so as to prevent the lubricating oil from being agitated again by the high-speed airflow and re-entering the upper part of the motor. When the oil level in the oil sump is too high, the flange on the outer layer of the muffler can isolate the high-speed airflow and prevent the high-speed airflow from agitating the oil surface and carrying excessive lubricating oil into the upper part of the motor.

[0009] The root of the flange is provided with an oil drain groove along its circumference. The oil drain groove is used to promptly remove the lubricating oil accumulated on the outer surface of the muffler and return it to the oil sump to avoid it being carried away by the high-speed airflow and re-entering the upper part of the motor stator.

[0010] On a plane perpendicular to the axis of the double-layer muffler, the projection of the oil drain groove intersects with or does not overlap with the projection of the flow hole on the edge of the upper cylinder head. This prevents a large amount of exhaust gas from flowing into the lower oil sump from the oil drain groove, and prevents the oil accumulated on the surface of the muffler from being carried away by the airflow in the flow hole of the upper cylinder head during the process of returning to the lower oil sump through the oil drain groove.

[0011] As a preferred technical solution, both the inner layer and the outer layer of the muffler include a first upper protrusion and a second upper protrusion. The first upper protrusion is provided with a second upper protrusion. An exhaust port is opened on the second upper protrusion of the inner layer of the muffler, and an exhaust hole is opened on the second upper protrusion of the outer layer of the muffler.

[0012] As a preferred technical solution, a central hole is provided in the center of the second upper protrusion of both the inner layer and the outer layer of the muffler. The muffler is sleeved on the upper cylinder head by passing through the central hole through the central shaft of the upper cylinder head. An exhaust port is provided next to the central hole of the inner layer of the muffler and the exhaust port is connected to the central hole of the inner layer of the muffler. An exhaust hole is provided next to the central hole of the outer layer of the muffler and the exhaust hole is connected to the central hole of the outer layer of the muffler.

[0013] As a preferred technical solution, a connecting hole is provided on the ring edge. The connecting hole is used to connect the muffler to the top surface groove of the upper cylinder head body. The connecting hole avoids upward protrusion.

[0014] Furthermore, the outer diameter D of the flange, the outer diameter D2 of the motor stator coil, and the inner diameter D1 of the housing satisfy the following condition: D2≤D≤D1. In this way, the high-speed airflow discharged from the pump body can flow upward along the flange, allowing it to circulate as much as possible through the airflow channels inside the motor stator coil and the motor rotor, avoiding a large amount of high-speed airflow flowing towards the housing and impacting it, so as to prevent the lubricating oil flowing down the inner wall of the housing from being disturbed by the high-speed airflow discharged from the pump body.

[0015] Furthermore, the height H of the flange, the height H2 of the motor stator coil, and the installation height H1 of the upper cylinder head satisfy: 0 < H ≤ H1 - H2. This setting can prevent the flange height from being too high, thereby affecting the motor stator coil above the double-layer muffler, and at the same time avoid the lubricating oil being disturbed by the pump exhaust when the oil level is high.

[0016] Furthermore, the flange angle α satisfies: 0 < α ≤ 90°. If the flange angle α is too small, it will easily affect each other when assembled with the upper cylinder head. If the flange angle α is too large, it will not be able to prevent a large amount of high-speed airflow from flowing towards the housing and impacting it, so as to prevent the lubricating oil flowing down the inner wall of the housing from being disturbed by the high-speed airflow discharged by the pump body.

[0017] Furthermore, the shape of the unloading groove is either a circular hole or an annular shape, or a number of circular holes arranged adjacent to each other. The circular hole shape or the number of circular holes arranged adjacent to each other is convenient for processing, while the annular shape can maximize the flow area within a limited range.

[0018] As a preferred technical solution, the flow hole on the edge of the upper cylinder head is shaped like an annular ring.

[0019] Furthermore, the area S of the oil unloading groove and the flow area S1 of the flow hole on the edge of the upper cylinder head satisfy the following condition: S≤1 / 2S1. If the area S is too large, it will increase the disturbance of the exhaust to the lower oil sump. If the area S is too small, it will be not conducive to the return of lubricating oil to the oil sump.

[0020] As a preferred technical solution, the oil unloading tank is provided with several of varying lengths along the circumferential direction of the flange.

[0021] Furthermore, the top of the flange is provided with a folded edge, which further strengthens the isolation of downward lubricating oil and upward exhaust in the circumferential space.

[0022] As a preferred technical solution, the folded edge is folded upward, downward, or flat. Folding upward can further prevent exhaust from running towards the housing side, folding downward can further prevent exhaust from interfering with the oil surface of the lower oil sump, and folding flat can further strengthen the isolation of downward lubricating oil and upward exhaust in the circumferential space.

[0023] Furthermore, the outer diameter Dz of the folded edge, the outer diameter D2 of the motor stator coil, and the inner diameter D1 of the housing satisfy the condition: D2≤Dz≤D1, which is also to further strengthen the isolation of the downward lubricating oil and the upward exhaust in the circumferential space.

[0024] Furthermore, on a plane perpendicular to the axis of the double-layer muffler, the projection of the exhaust port intersects at least partially with the projection of the exhaust hole, thus facilitating the exhaust of the pump body from the inner muffler cavity and the outer muffler cavity to the ventilation cavity.

[0025] One of the technical solutions of this utility model is to provide a compressor that can stabilize the oil level. The compressor housing is provided with the aforementioned double-layer muffler, as well as a motor stator coil and an upper cylinder head. The double-layer muffler is installed on the upper cylinder head, and the motor stator coil is located above the double-layer muffler.

[0026] As a preferred technical solution, the circumferential side of the upper cylinder head is interference-fitted with the housing.

[0027] As a preferred technical solution, the circumferential side of the upper cylinder head is fixedly connected to the housing.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The silencer in this utility model adopts a double-layer and outer perimeter flange design. In addition to the conventional silence function, it also has the function of improving the internal oil circuit of the compressor and stabilizing the oil level in the oil sump, so that the compressor can operate at ultra-high speed and reliably at a safe oil level.

[0030] (2) In this utility model, by designing the outer diameter and angle of the flange, the flange guides the high-speed exhaust airflow, so that most of the exhaust is discharged from the air gap between the stator and rotor at the top of the pump body, avoiding interference of the high-speed exhaust airflow with the lubricating oil flowing down the inner wall of the casing, which would lead to poor oil return.

[0031] (3) In this utility model, by designing the flange height, the high-speed exhaust airflow is avoided from disturbing the oil surface of the oil tank under the condition of high oil level;

[0032] (4) In this utility model, the design of the oil unloading groove avoids the deposition of lubricating oil on the muffler and further stabilizes the oil level in the lower oil tank. At the same time, by setting the relative position of the oil unloading groove and the flow hole of the upper cylinder head, it is beneficial to guide the lubricating oil after oil-gas separation back to the oil tank and avoid the lubricating oil being carried away by the airflow in the flow hole of the upper cylinder head during the process of returning to the lower oil tank. Attached Figure Description

[0033] Figure 1 This is a top view of the outer layer of the muffler in Embodiment 2 of this utility model;

[0034] Figure 2 This is a schematic diagram of the main cross-sectional structure of the outer layer of the muffler in Embodiment 2 of this utility model;

[0035] Figure 3 This is a schematic diagram of the structure of the double-layer silencer that can stabilize the oil surface in Embodiment 1 of this utility model;

[0036] Figure 4 This is a schematic diagram of the compressor capable of stabilizing the oil level in Embodiment 1 of this utility model;

[0037] Figure 5 This is a schematic diagram of the upper cylinder head in Embodiment 1 of this utility model;

[0038] Figure 6 This is a schematic diagram of the oil unloading tank in Embodiment 5 of this utility model;

[0039] Figure 7 This is a schematic diagram of the oil unloading tank in Embodiment 1 of this utility model.

[0040] Explanation of markings in the diagram:

[0041] 1—Inner layer of muffler, 2—Outer layer of muffler, 3—Stator coil of motor, 4—Housing, 5—Upper cylinder head;

[0042] 21—Ring edge, 22—Flanged edge, 23—Folded edge, 24—Oil unloading groove, 25—First upper convexity, 26—Second upper convexity, 27—Central hole, 28—Exhaust hole, 29—Connecting hole, 51—Central shaft, 52—Flow hole, 53—Main body. Detailed Implementation

[0043] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and are not intended to imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] A compressor that can stabilize the oil level, such as Figure 4 and Figure 5 As shown, the compressor housing 4 is equipped with a double-layer muffler, a motor stator coil 3 and an upper cylinder head 5. The double-layer muffler is installed on the upper cylinder head 5, and the circumferential side of the upper cylinder head 5 is welded to the housing 4. The motor stator coil 3 is located above the double-layer muffler.

[0047] The following embodiments describe the structure of a double-layer muffler.

[0048] Example 1:

[0049] A double-layer muffler capable of stabilizing the oil level is installed inside the compressor described above. It includes an inner muffler layer 1 and an outer muffler layer 2. A ring edge 21 is provided on the outer periphery of the bottom of the double-layer muffler. The inner muffler layer 1 and the outer muffler layer 2 are respectively connected to the ring edge 21. An exhaust port is provided on the inner muffler layer 1, and an exhaust hole 28 is provided on the outer muffler layer 2. The upper part of the outer muffler layer 2 serves as a ventilation chamber. The inner muffler layer 1, the main body 53 of the upper cylinder head 5, and the central axis 51 of the upper cylinder head 5 form an inner muffler chamber. The outer muffler layer 2, the inner muffler layer 1, and the central axis 51 of the upper cylinder head 5 form an outer muffler chamber. The ventilation chamber is connected to the inner muffler chamber and the outer muffler chamber through the exhaust port and the exhaust hole 28.

[0050] Both the inner layer 1 and the outer layer 2 of the muffler include a first upper protrusion 25 and a second upper protrusion 26. The second upper protrusion 26 is provided on the first upper protrusion 25. An exhaust port is provided on the second upper protrusion 26 of the inner layer 1 of the muffler, and an exhaust hole 28 is provided on the second upper protrusion 26 of the outer layer 2 of the muffler.

[0051] On a plane perpendicular to the axis of the double-layer muffler, the projection of the exhaust port intersects at least partially with the projection of the exhaust hole 28, thus facilitating the exhaust of the pump body from the inner muffler chamber and the outer muffler chamber to the ventilation chamber.

[0052] Both the inner layer 1 and the outer layer 2 of the muffler have a central hole 27 in the center of their second upper protrusion 26. The muffler is fitted onto the upper cylinder head 5 by passing the central shaft 51 through the central hole 27. An exhaust port is provided next to the central hole 27 of the inner layer 1 of the muffler, and the exhaust port is connected to the central hole 27 of the inner layer 1 of the muffler. An exhaust port 28 is provided next to the central hole 27 of the outer layer 2 of the muffler, and the exhaust port 28 is connected to the central hole 27 of the outer layer 2 of the muffler.

[0053] A connecting hole 29 is provided on the circumferential edge 21. The connecting hole 29 is used to connect the muffler to the groove on the top surface of the main body 53 of the upper cylinder head 5. The connecting hole 29 avoids the upward protrusion.

[0054] The outer layer 2 of the muffler has flanges 22 arranged around its entire circumference. The flanges 22 are used to isolate the high-speed airflow discharged from the pump body and the lubricating oil flowing down the inner wall of the housing 4, so as to prevent the lubricating oil from being agitated by the high-speed airflow and re-entering the upper part of the motor. When the oil level in the oil sump is too high, the flanges 22 of the outer layer 2 of the muffler can isolate the high-speed airflow and prevent the high-speed airflow from agitating the oil surface and carrying excessive lubricating oil into the upper part of the motor.

[0055] like Figure 3As shown, the outer diameter D of the flange 22, the outer diameter D2 of the motor stator coil 3, and the inner diameter D1 of the housing 4 satisfy the following condition: D2≤D≤D1. In this way, the high-speed airflow discharged from the pump body can flow upward along the flange 22, so that it can flow through the airflow channel inside the motor stator coil 3 and the motor rotor as much as possible, avoiding a large amount of high-speed airflow flowing towards the housing 4 and impacting it, so as to prevent the lubricating oil flowing down the inner wall of the housing 4 from being disturbed by the high-speed airflow discharged from the pump body. In this embodiment, the outer diameter D is preferably (D1+D2) / 2.

[0056] The height H of the flange 22, the height H2 of the motor stator coil 3, and the installation height H1 of the upper cylinder head 5 satisfy: 0 < H ≤ H1 - H2. This setting can prevent the height of the flange 22 from being too high, thereby affecting the motor stator coil 3 above the double-layer muffler. At the same time, it avoids the lubricating oil being disturbed by the pump exhaust when the oil level is high. In this embodiment, the height H is preferably H1 - H2.

[0057] The angle α of the flange 22 satisfies: 0<α≤90°. If the angle α of the flange 22 is too small, it will easily affect each other when assembled with the upper cylinder head 5. If the angle α of the flange 22 is too large, it will not be able to prevent a large amount of high-speed airflow from flowing and impacting the housing 4, so as to prevent the lubricating oil flowing down the inner wall of the housing 4 from being disturbed by the high-speed airflow discharged from the pump body. In this embodiment, the angle α is preferably 45°.

[0058] The root of the flange 22 is provided with an oil drain groove 24 along its circumference. The oil drain groove 24 is used to promptly remove the lubricating oil accumulated on the surface of the outer layer 2 of the muffler so that it flows back to the oil sump, so as to avoid being carried away by the high-speed airflow and re-entering the upper part of the motor stator.

[0059] like Figure 7 As shown, the shape of the unloading tank 24 is an annular shape, which can maximize the flow area within a limited range;

[0060] The shape of the flow hole 52 on the edge of the upper cylinder head 5 is preferably an annular shape;

[0061] The area S of the oil unloading groove 24 and the flow area S1 of the flow hole 52 on the edge of the upper cylinder head 5 satisfy: S≤1 / 2S1. If the area S is too large, it will increase the disturbance of the exhaust to the lower oil sump. If the area S is too small, it will be not conducive to the return of lubricating oil to the oil sump. In this embodiment, the area S is preferably 1 / 2S1.

[0062] On a plane perpendicular to the axis of the double-layer muffler, the projection of the oil drain 24 intersects with the projection of the flow hole 52 on the edge of the upper cylinder head 5. This prevents exhaust from flowing into the lower oil sump from the oil drain 24 in large quantities, and prevents the oil accumulated on the surface of the muffler from being carried away by the airflow in the flow hole 52 of the upper cylinder head during the process of returning to the lower oil sump through the oil drain 24.

[0063] The oil unloading trough 24 is provided with several of varying lengths along the circumference of the flange 22, and in this embodiment, four are preferred.

[0064] Example 2:

[0065] A double-layer muffler that can stabilize the oil level is basically the same as that in Example 1, except that, as Figure 1 and Figure 2 As shown, the top of the flange 22 can also be provided with a folded edge 23 around the entire circumference, and the folded edge 23 further strengthens the isolation of the downward lubricating oil and the upward exhaust in the circumferential space;

[0066] When the fold 23 is folded flat in the direction of the fold, the isolation of the downward lubricating oil and the upward exhaust in the circumferential space can be further strengthened;

[0067] The outer diameter Dz of the folded edge 23, the outer diameter D2 of the motor stator coil 3, and the inner diameter D1 of the housing 4 satisfy the condition: D2≤Dz≤D1. This is also to further strengthen the isolation of the downward lubricating oil and the upward exhaust in the circumferential space. In this embodiment, the outer diameter Dz is preferably 9(D1+D2) / 10.

[0068] Example 3:

[0069] A double-layer muffler that can stabilize the oil level is basically the same as that in Example 2, except that the direction of the folded edge 23 can also be upward, which can further prevent the exhaust from running to the side of the housing 4.

[0070] Example 4:

[0071] A double-layer silencer that can stabilize the oil level is basically the same as that in Example 2, except that the direction of the folded edge 23 can also be downward, which can further prevent the exhaust from interfering with the oil level of the lower oil tank.

[0072] Example 5:

[0073] A double-layer muffler that can stabilize the oil level is basically the same as that in Example 1, except that, as Figure 6 As shown, the shape of the oil unloading groove 24 can also be selected by arranging several round holes adjacent to each other for easy processing. In this embodiment, nine holes are preferred.

[0074] Example 6:

[0075] A double-layer silencer that can stabilize the oil level is basically the same as that in Example 1, except that the shape of the oil unloading groove 24 can also be a round hole, which is convenient for processing.

[0076] Example 7:

[0077] A double-layer muffler that can stabilize the oil level is basically the same as that in embodiment 1, except that the projection of the oil unloading groove 24 on the plane perpendicular to the axis of the double-layer muffler can completely not overlap with the projection of the flow hole 52 on the edge of the upper cylinder head 5. This can prevent exhaust from flowing into the lower oil sump in large quantities from the oil unloading groove 24, and prevent the oil accumulated on the surface of the muffler from being carried away by the airflow in the flow hole 52 of the upper cylinder head during the process of returning to the lower oil sump through the oil unloading groove 24.

[0078] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A double-layered muffler capable of stabilizing an oil level, characterized by comprising: The double-layer muffler comprises a muffler inner layer (1) and a muffler outer layer (2), the outer periphery of the bottom of the double-layer muffler is provided with a ring edge (21), the muffler inner layer (1) and the muffler outer layer (2) are connected with the ring edge (21) respectively, the muffler inner layer (1) is provided with an exhaust port, the muffler outer layer (2) is provided with an exhaust hole (28), the upper portion of the muffler outer layer (2) is used as a ventilation cavity, the muffler inner layer (1) and the main body (53) of the upper cylinder cover (5) and the central shaft (51) of the upper cylinder cover (5) enclose an inner muffling cavity, the muffler outer layer (2) and the muffler inner layer (1) and the central shaft (51) of the upper cylinder cover (5) enclose an outer muffling cavity, the ventilation cavity is communicated with the inner muffling cavity and the outer muffling cavity through the exhaust port and the exhaust hole (28). The ring edge (21) is outwardly provided with a turned edge (22), the root of the turned edge (22) is provided with an oil discharging groove (24) along the circumferential direction, and the projection of the oil discharging groove (24) on a plane perpendicular to the axis of the double-layer muffler intersects with the projection of the through-flow hole (52) of the edge of the upper cylinder cover (5) or is completely not overlapped.

2. The double-layered muffler capable of stabilizing the oil level according to claim 1, wherein The outer diameter D of the turned edge (22), the outer diameter D2 of the motor stator coil (3) and the inner diameter D1 of the shell (4) satisfy D2≤D≤D1.

3. The dual layer muffler of claim 1, wherein, The height H of the turned edge (22), the height H2 of the motor stator coil (3) and the installation height H1 of the upper cylinder cover (5) satisfy 0<H≤H1-H2.

4. The dual-layered acoustic silencer capable of stabilizing the oil level according to claim 1, wherein, The angle α of the turned edge (22) satisfies 0<α≤90°.

5. The dual layer muffler of claim 1, wherein, The shape of the oil discharging groove (24) is a round hole shape or a ring waist shape, or a plurality of round holes are arranged adjacently.

6. The dual layer muffler of claim 1, wherein, The area S of the oil discharging groove (24) and the flow area S1 of the through-flow hole (52) of the edge of the upper cylinder cover (5) satisfy S≤1 / 2S1.

7. The dual-layered acoustic silencer capable of stabilizing the oil surface according to claim 1, wherein The top of the turned edge (22) is outwardly provided with a folded edge (23).

8. The double-layered muffler capable of stabilizing the oil level according to claim 7, wherein The outer diameter Dz of the folded edge (23), the outer diameter D2 of the motor stator coil (3) and the inner diameter D1 of the shell (4) satisfy D2≤Dz≤D1.

9. The dual-layered acoustic silencer capable of stabilizing the oil surface according to claim 1, wherein, The projection of the exhaust port and the projection of the exhaust hole (28) at least partially intersect on a plane perpendicular to the axis of the double-layer muffler.

10. A compressor that can stabilize the oil level, characterized by The shell (4) of the compressor is provided with the double-layer muffler as claimed in any one of claims 1 to 9, and a motor stator coil (3) and an upper cylinder cover (5), the double-layer muffler is mounted on the upper cylinder cover (5), and the motor stator coil (3) is located above the double-layer muffler.

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