Exhaust silencer and working method

Abstract

The invention provides an exhaust silencer and a working method, relates to the field of compressor silencers, and aims to solve the problem that in the prior art, a cantilever structure air pipe is arranged to prolong an air flow path, so that the structure of the silencer is complex, partition plates and annular plates are reasonably arranged in a cavity, a plurality of cavities are formed, and silencing holes are formed between the cavities; the path length of airflow from the inlet end of the first chamber to the outlet end of the fourth chamber of the cavity is prolonged, when the airflow flows among different chambers, more time and space are provided for buffering and diffusion, the condition of sound wave interference cancellation is met, the silencing effect is further enhanced, the axis of the second silencing hole is obliquely distributed relative to the axis of the annular plate, and therefore the silencing effect is improved. And one end communicated with the third cavity is inclined towards the direction of the first partition plate, so that a specific guiding effect on airflow can be achieved, the airflow can flow in the cavities more orderly, the space of each cavity is more fully utilized for buffering, mixing and energy dissipation, an air pipe of a cantilever structure does not need to be adopted, and therefore the structure of the silencer is simplified.

Description

Technical Field

[0001] The invention relates to the field of compressor mufflers, and in particular to an exhaust muffler and a working method thereof. Background Art

[0002] During the operation of a reciprocating compressor, the gas is compressed through the reciprocating motion of the piston. The gas pressure and pulsation after compression are relatively large, and large noise and vibration will be generated when flowing through the compressor gas path system. After the compressor is installed on the refrigerator, the noise and vibration generated when the compressor is exhausted are too large, which will affect the service life of the compressor and reduce the customer's experience of purchasing the refrigerator. The exhaust muffler is one of the key components in the compressor gas path system. Its main function is to reduce the noise during the gas discharge process. The noise is generated by vibration. Therefore, reducing the exhaust pulsation of the compressed gas can effectively reduce the exhaust noise of the compressor and improve the overall quality of the compressor. In the design of the exhaust muffler, the key role in reducing the exhaust pulsation is the distribution of different chambers and pores. Therefore, the appropriate number of chambers and reasonable pore distribution play a key role in reducing the exhaust noise of the compressor.

[0003] When using a muffler to weaken or eliminate exhaust pulsation, when the airflow enters another cavity from one cavity, a better muffler effect can be achieved by extending the path length from the inlet end to the outlet end of the cavity, so that the airflow has more time and space for buffering and diffusion, and the longer path provides more opportunities for the airflow to mix and interact internally. When the airflow flows in the cavity, it will rub and collide with the cavity wall and internal obstacles, thereby consuming the energy of the airflow. In the muffler, in order to extend the airflow flow path, a cantilever structure air pipe is set to connect to the outlet end to extend the distance between the cavity inlet end and the outlet end. However, the cantilever structure air pipe makes the structure of the muffler complicated, increasing the difficulty and cost of design and manufacturing. The cantilever structure air pipe is prone to vibration and deformation under the action of airflow, especially in a high-velocity, high-pressure airflow environment, and will increase the airflow resistance and reduce the efficiency of airflow discharge. Long-term use may cause structural damage, affecting the normal operation and service life of the muffler. Summary of the invention

[0004] The purpose of the present invention is to provide an exhaust silencer and a working method to address the defects of the prior art. By reasonably arranging partitions and ring plates in the cavity to form multiple chambers and silencer holes between the chambers, the path length of the airflow from the inlet end of the first chamber to the outlet end of the fourth chamber of the cavity is extended. When the airflow flows between different chambers, there is more time and space for buffering and diffusion, which meets the conditions for sound wave interference and destructiveness, thereby enhancing the silencer effect.

[0005] The first object of the present invention is to provide an exhaust muffler, which adopts the following scheme:

[0006] It includes a shell, in which a columnar cavity with both ends blocked is formed, a first partition and a second partition are distributed in the cavity along the axial direction at intervals, and the cavity is divided into a first chamber, an intermediate chamber and a fourth chamber, an annular plate is installed between the first partition and the second partition, so that the intermediate chamber is divided into a second chamber outside the annular plate and a third chamber inside the annular plate, a first silencer hole connecting the first chamber and the second chamber is arranged on the first partition, a second silencer hole is arranged on the outer peripheral wall of the annular plate away from one end of the first partition in the axial direction to connect the second chamber and the third chamber; a third silencer hole connecting the third chamber and the fourth chamber is arranged on the second partition; the axis of the second silencer hole is inclined compared to the axis of the annular plate, and one end of the second silencer hole connecting the third chamber is inclined toward the first partition.

[0007] Furthermore, the first baffle, the second baffle and the ring plate are coaxially distributed, and along the ring direction of the first baffle, a plurality of first silencer holes are evenly distributed on the first baffle, and a plurality of second silencer holes are evenly distributed on the ring plate, so that the airflow passing through the second silencer holes is counteracted along the radial direction of the ring plate.

[0008] Furthermore, the plurality of second silencer holes are divided into a plurality of pairs, and the second silencer holes of the same pair are distributed at two ends of the same diameter of the ring plate.

[0009] Furthermore, a cylindrical second chamber is formed on the outer side of the ring plate, and a columnar third chamber is formed on the inner side of the ring plate. The first silencer hole flows through the second chamber along the axial length of the ring plate and then enters the second silencer hole.

[0010] Furthermore, the first partition plate has an annular groove for accommodating one end of the ring plate on one side facing the middle chamber, and the second partition plate has an annular groove for accommodating one end of the ring plate on one side facing the middle chamber, and both ends of the ring plate are respectively embedded in the annular grooves for sealing.

[0011] Furthermore, the third silencer hole is coaxially distributed with the second partition plate.

[0012] Furthermore, the shell includes a first shell, a second shell and a third shell which are connected in sequence along the axial direction of the cavity, and the second shell is cylindrical and is sleeved outside the ring plate.

[0013] Furthermore, the first shell corresponding to the end of the first chamber near the first partition is provided with a reducing section, and the third shell corresponding to the end of the fourth chamber near the second partition is also provided with a reducing section. The diameter of the reducing section gradually increases along the axis of the ring plate in the direction close to the middle chamber, so that one end of the first shell forms an expansion structure, and one end of the third shell forms a contraction structure.

[0014] A second object of the present invention is to provide a method for operating the exhaust muffler as described in the first object, comprising:

[0015] The first chamber of the exhaust muffler is connected to the exhaust port of the compressor cylinder through an intake pipe, and the exhaust gas is introduced into the chamber;

[0016] After the exhaust gas enters the first chamber, it passes through the first muffler hole, the second chamber, the second muffler hole, the third chamber, the third muffler hole and the fourth chamber in sequence, and is discharged through the exhaust pipe;

[0017] The exhaust gas flows through the second chamber and then enters the second silencer hole. Under the guidance of the second silencer hole, the exhaust gas flows into the third chamber and flows toward the first partition first. After being blocked by the first partition, it returns and enters the third silencer hole, thereby weakening the sound intensity.

[0018] Furthermore, a plurality of first silencer holes and second silencer holes are provided, and the exhaust gas flows from the first baffle plate to the first silencer holes at the plurality of positions to enter the second chamber, and flows from the ring plate to the second silencer holes at the plurality of positions to enter the third chamber.

[0019] Compared with the prior art, the present invention has the following advantages and positive effects:

[0020] In view of the problem in the prior art that the airflow path is extended by setting a cantilever structure air pipe, which leads to a complex structure of the muffler, increased difficulty in design and manufacturing and cost, by reasonably setting baffles and ring plates in the cavity to form multiple chambers and silencer holes between the chambers, the path length of the airflow from the inlet end of the first chamber to the outlet end of the fourth chamber of the cavity is extended. When the airflow flows between different chambers, there is more time and space for buffering and diffusion, which meets the conditions for sound wave interference and cancellation, thereby enhancing the silencing effect. In addition, the axis of the second silencer hole is inclined compared to the axis of the ring plate, and the end connected to the third cavity is inclined toward the direction of the first baffle, which can play a specific guiding role on the airflow, making the flow of the airflow in the chamber more orderly and making more effective use of the space of each chamber for buffering, mixing and energy dissipation. There is no need to use a cantilever structure air pipe, thereby simplifying the structure of the muffler.

[0021] The axis of the second silencer hole is inclined compared to the axis of the ring plate, and one end connected to the third cavity is inclined toward the first partition, so that when the airflow enters the third cavity from the second cavity, it first flows toward the first partition, and then returns to enter the third silencer hole after being blocked by the first partition. The guiding effect changes the flow direction of the airflow, so that the airflow forms a circuitous flow path in the third cavity. Without using a cantilever structure air pipe, the length of the flow path of the airflow in the cavity is effectively increased.

[0022] The multiple second silencer holes are divided into multiple pairs, and the same pair of second silencer holes are distributed at both ends of the same diameter of the ring plate, so that the airflow passing through the second silencer holes is counter-acted along the radial direction of the ring plate. When the two airflows are counter-acting, mutual collision, friction and interference will occur, and the interaction can consume the energy of the airflow and reduce the sound intensity of the airflow. According to the principle of acoustics, the reduction of airflow energy means the reduction of noise intensity, thereby achieving the effect of silencing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 It is a schematic diagram of the disassembly of an exhaust muffler in one or more embodiments of the present invention.

[0025] Figure 2 Schematic diagram of the internal structure of the exhaust muffler in one or more embodiments of the present invention.

[0026] Figure 3 Schematic diagram of a first partition in one or more embodiments of the present invention.

[0027] Figure 4 Schematic diagram of the second partition in one or more embodiments of the present invention.

[0028] Among them, 1. first shell; 2. first partition; 3. ring plate; 4. second shell; 5. second partition; 6. third shell; 7. exhaust pipe; 8. first chamber; 9. second chamber; 10. third chamber; 11. fourth chamber. DETAILED DESCRIPTION

[0029] Example 1

[0030] In a typical embodiment of the present invention, Figure 1-Figure 4 As shown, an exhaust muffler is provided.

[0031] Existing silencers usually use cantilever structure air pipes to extend the airflow path, which makes the structure complicated, greatly increases the difficulty of design and manufacturing, and increases the cost. In addition, in a high-velocity, high-pressure airflow environment, the cantilever structure is prone to vibration and deformation. The cantilever structure air pipe will also increase the airflow resistance and reduce the efficiency of airflow discharge, resulting in poor silencing effect and failure to effectively weaken the noise generated by exhaust pulsation. Based on this, this embodiment provides an exhaust silencer that uses a means of reasonably setting a partition and a ring plate 3 in the cavity, forming multiple chambers, and using the silencing holes between the chambers to extend the airflow path, optimize the overall structure, and eliminate the use of air pipes to extend the airflow path, thereby ensuring the silencing effect.

[0032] like Figure 1 and Figure 2 As shown, a cylindrical cavity with both ends blocked is constructed in the shell, and a first partition plate 2 and a second partition plate 5 are distributed in the cavity along the axial interval, thereby dividing the cavity into a first chamber 8, an intermediate chamber and a fourth chamber 11. An annular plate 3 is installed between the first partition plate 2 and the second partition plate 5, so that the intermediate chamber is further divided into a second chamber 9 outside the annular plate 3 and a third chamber 10 inside the annular plate 3. A first muffler hole connecting the first chamber 8 and the second chamber 9 is provided on the first partition plate 2; a second muffler hole is provided on the outer peripheral wall of the annular plate 3 at one end away from the first partition plate 2 in the axial direction, for connecting the second chamber 9 and the third chamber 10; a third muffler hole connecting the third chamber 10 and the fourth chamber 11 is provided on the second partition plate 5.

[0033] like Figure 1 and Figure 2 As shown, the main structure of the exhaust muffler is a shell, which is formed by the first shell 1, the second shell 4 and the third shell 6 being connected in sequence, and a cavity is formed inside. The first partition 2, the second partition 5 and the ring plate 3 are installed in the cavity to divide the cavity into four chambers. The first partition 2 and the second partition 5 are arranged in the cavity at intervals, and the ring plate 3 is installed between the first partition 2 and the second partition 5. The first shell 1, the second shell 4 and the third shell 6 are connected to form a capsule-shaped shell, and the ring plate 3 is arranged in the cylindrical section of the shell.

[0034] like Figure 2 As shown, the four chambers are respectively a first chamber 8 formed by a first shell 1 and a second partition 5, a second chamber 9 formed by a ring plate 3 and a second shell 4 sleeved outside the ring plate 3 in combination with the first partition 2 and the second partition 5, a third chamber 10 formed after both ends of the ring plate 3 are blocked by the first partition 2 and the second partition 5, and a fourth chamber 11 formed by the second partition 5 and the third shell 6. The first chamber 8, the second chamber 9, the third chamber 10 and the fourth chamber 11 are connected in sequence, the first chamber 8 is connected to the exhaust port of the compressor, the exhaust of the compressor cylinder is introduced into the exhaust muffler, and after the muffler effect of other chambers, it is discharged to the outside of the exhaust muffler through the exhaust pipe 7 connected to the fourth chamber 11.

[0035] Specifically, the cavity in the exhaust muffler is axially divided into three large parts from left to right (the airflow flows from left to right) by setting a first partition 2 and a second partition 5, namely a first chamber 8, a middle chamber and a fourth chamber 11, wherein the middle chamber is further subdivided by the ring plate 3.

[0036] The first chamber 8 is located at the starting end of the muffler. It is connected to the exhaust port of the compressor cylinder through the intake pipe and is the first chamber where the exhaust gas flow enters the muffler. The first chamber 8 is connected to the second chamber 9 in the middle chamber through the first muffler hole on the first partition 2, and the gas flow enters the second chamber 9 from the first chamber 8 through the first muffler hole. The middle chamber is between the first chamber 8 and the fourth chamber 11, and is divided into two parts by the ring plate 3 installed between the first partition 2 and the second partition 5.

[0037] The second chamber 9 is located outside the ring plate 3 and surrounds the ring plate 3 in a cylindrical shape. It receives the airflow flowing in from the first chamber 8 through the first silencer hole. After the airflow flows along the axial length of the ring plate 3 in the second chamber 9, it enters the third chamber 10 through the second silencer hole on the ring plate 3. The third chamber 10 is located inside the ring plate 3 and is columnar. The third chamber 10 is connected to the second chamber 9 through the second silencer hole on the outer peripheral wall of the ring plate 3, and is connected to the fourth chamber 11 through the third silencer hole on the second partition 5. After the airflow enters the third chamber 10 from the second chamber 9 through the second silencer hole, it first flows toward the first partition 2 in the third chamber 10, and then returns to the third silencer hole after being blocked by the first partition 2, and then flows into the fourth chamber 11. The fourth chamber 11 is located at the end of the muffler and is connected to the third chamber 10 through the third silencer hole on the second partition 5. The airflow processed by multiple chambers is finally discharged from the muffler from the fourth chamber 11 through the exhaust pipe 7.

[0038] After the cantilever structure air pipe is abandoned in this embodiment, the structure of the muffler is simplified, the difficulty and cost of design and manufacturing are reduced, and at the same time the stability of the structure is improved, and the risk of damage due to vibration deformation in harsh airflow environments is reduced, thereby extending the service life of the muffler. The optimized internal structure also reduces the airflow resistance and improves the efficiency of airflow discharge. Secondly, the setting of the multi-chamber structure and the silencer hole extends the airflow path, allowing the airflow to be fully buffered and diffused between the chambers, meeting the conditions for the interference and cancellation of sound waves, effectively enhancing the silencing effect, and better weakening the noise generated by exhaust pulsation. In addition, when the airflow flows between different chambers, it rubs and collides with the chamber wall, partition and ring plate 3, further promoting the dissipation of airflow energy and improving the silencing effect.

[0039] like Figure 2 and Figure 3 As shown, the first baffle 2, the second baffle 5 and the ring plate 3 are coaxially distributed, and a plurality of first silencer holes are evenly distributed in the circumferential direction of the first baffle 2, and a plurality of second silencer holes are evenly distributed on the ring plate 3. The first silencer holes and the second silencer holes are evenly distributed so that the airflow can evenly enter each chamber. The even airflow distribution helps to avoid the local airflow speed being too fast or too slow, ensures the stability and consistency of the silencer process, and enables the entire silencer to effectively play a silencer role in the circumferential direction.

[0040] As for the first silencer holes, the first silencer holes are distributed on the first partition plate 2, separating the first chamber 8 from the second chamber 9. When the airflow enters the second chamber 9 from the first chamber 8, the first silencer holes play a certain throttling and buffering role, limiting the flow rate of the airflow, so that the pressure of the airflow can be balanced to a certain extent when entering the second chamber 9, reducing the pressure pulsation of the airflow. In addition, a plurality of first silencer holes are evenly distributed along the first partition plate 2 in the circumferential direction. When the exhaust airflow enters the second chamber 9 from the first chamber 8 through the first silencer holes, the evenly distributed first silencer holes enable the airflow to be dispersed more evenly into the second chamber 9. This avoids the concentration of the airflow in a certain local area, so that the airflow has a wider diffusion space in the second chamber 9, can more fully contact the wall surface of the second chamber 9, increase the friction area and time between the airflow and the wall surface, thereby consuming more airflow energy and playing a role in initially weakening the sound intensity.

[0041] The multiple second silencer holes are divided into multiple pairs, and the same pair of second silencer holes are distributed at both ends of the same diameter of the ring plate 3, so that the airflow passing through the second silencer holes is radially opposed to each other along the ring plate 3. When the two airflows are opposed, collision and interaction will occur. From an acoustic point of view, this collision can consume the energy of the airflow and reduce the intensity of the sound waves. At the same time, the collision of airflow will also make the airflow more turbulent, increase the friction and collision opportunities between the airflow and the chamber wall and the internal structure, further dissipate the energy of the airflow, and improve the silencing effect.

[0042] In this embodiment, the axis of the second silencer hole is tilted relative to the axis of the ring plate 3, and one end connected to the third cavity is tilted toward the first partition plate 2, so that when the airflow enters the third cavity 10 from the second cavity 9, it first flows toward the first partition plate 2, and then returns to the third silencer hole after being blocked by the first partition plate 2. The guiding effect of the second silencer hole changes the flow direction of the airflow, so that the airflow forms a circuitous flow path in the third cavity 10, and effectively increases the flow path length of the airflow in the cavity without using a cantilever structure air pipe.

[0043] The plurality of second silencer holes are evenly distributed on the ring plate 3, so that when the airflow enters the third chamber 10 from the second chamber 9, it does not enter from a certain position, but enters the third chamber 10 evenly in the circumferential direction of the ring plate 3. The flow range of the airflow in the third chamber 10 is wider, which extends the flow process of the airflow in the third chamber 10 as a whole, thereby increasing the flow path length of the airflow in the entire cavity.

[0044] The second silencer holes are evenly distributed on the ring plate 3, so that the airflow around the entire ring plate 3 can be effectively processed, avoiding the situation where the local airflow is not fully processed and causes poor silencer effect. The evenly distributed second silencer holes enable the airflow to evenly dissipate energy and interact with each other in the entire chamber after entering the third chamber 10, thereby ensuring the balance and stability of the silencer effect, and achieving a good silencer effect on the cross section of the entire silencer.

[0045] A cylindrical second chamber 9 is formed on the outside of the ring plate 3, and a columnar third chamber 10 is formed on the inside of the ring plate 3. The airflow from the first muffler hole flows through the second chamber 9 along the axial length of the ring plate 3 and then enters the second muffler hole. The design of this chamber structure provides a specific flow path for the airflow.

[0046] It should be pointed out in particular that Figure 2 As shown, when the exhaust gas flow enters the second chamber 9 from the first chamber 8 through the first silencer hole, since the second silencer hole is arranged on the outer peripheral wall of the ring plate 3 axially away from one end of the first partition plate 2, after entering the second chamber 9, the airflow will flow in the direction of the second silencer hole. Since there is no other obstacle to force the airflow to change the flow direction in this process, the airflow will flow along the axial direction of the second chamber 9. During the airflow flowing in the second chamber 9, there is enough space for buffering. When the airflow flows in the second chamber 9, the sound waves carried therein will continuously reflect from the wall surface of the second chamber 9. Interference will occur between sound waves reflected in different directions. When the phases of the two sound waves are opposite, they will cancel each other out, thereby reducing the intensity of the sound waves and effectively reducing the propagation of exhaust noise.

[0047] In addition, after the airflow flows through the second chamber 9 and completes buffering and diffusion, its state becomes more stable, which is conducive to better cooperation with the structure of the third chamber 10 when it subsequently enters the third chamber 10 through the second silencer hole, thereby further achieving the purpose of silencer.

[0048] Therefore, the cylindrical second chamber 9 allows the airflow to be buffered and diffused in a larger space, reducing the speed and pressure of the airflow. The columnar third chamber 10 provides a suitable space for subsequent airflow collision and energy dissipation, prolongs the residence time of the airflow in the muffler, and enhances the muffler effect.

[0049] The ring plate 3 is a cylindrical structure with both ends open. In order to realize the installation of the ring plate 3 in the cavity, as shown in FIG. Figure 3 and Figure 4As shown, the first partition plate 2 and the second partition plate 5 are provided with an annular groove for accommodating one end of the ring plate 3 on the side facing the middle chamber, and the two ends of the ring plate 3 are respectively embedded in the annular groove for sealing, which can prevent the airflow from leaking from the connection between the ring plate 3 and the partition plate, and ensure that the airflow can only follow the designed path and pass through the first chamber 8, the second chamber 9, the third chamber 10 and the fourth chamber 11 in sequence, avoiding the short circuit of the airflow and ensuring the normal operation and silencing effect of the silencer.

[0050] The third silencer hole is coaxially distributed with the second partition plate 5, so that the airflow flowing out of the third chamber 10 can evenly pass through the third silencer hole into the fourth chamber 11, further ensuring the smooth flow of the airflow and avoiding the problem of increased local noise or poor silencer effect caused by uneven airflow distribution.

[0051] like Figure 1 As shown, the shell includes a first shell 1, a second shell 4 and a third shell 6 which are connected in sequence along the axial direction of the cavity. The second shell 4 is cylindrical and is sleeved outside the ring plate 3. The segmented connection structure facilitates the manufacture, assembly and maintenance of the muffler. During the manufacturing process, each shell part can be processed separately to improve production efficiency and accuracy. During assembly, the various components can be easily installed together. If the muffler fails, it can also be more easily disassembled and repaired.

[0052] like Figure 1 and Figure 2 As shown, the first shell 1 corresponding to the end of the first chamber 8 near the first baffle 2 is provided with a reducing section, and the third shell 6 corresponding to the end of the fourth chamber 11 near the second baffle 5 is also provided with a reducing section, and the diameter of the reducing section gradually increases along the axis of the ring plate 3 close to the middle chamber, so that an expansion structure is formed at one end of the first shell 1, and a contraction structure is formed at one end of the third shell 6. When the airflow enters the expansion structure, its speed will decrease and the pressure will increase, which is helpful for the buffering and diffusion of the airflow, and can also cause the sound waves to reflect and interfere during the expansion process, weakening the sound intensity. The contraction structure can make the airflow more concentrated and stable when discharged, reducing the turbulence and noise of the airflow.

[0053] In terms of silencing performance, the noise generated by exhaust pulsation is effectively weakened through multiple methods such as airflow counteraction, buffering, diffusion and interference of sound waves. In terms of structural stability, the sealing structure and reasonable shell design ensure the normal operation and long-term use of the muffler. In terms of manufacturing and maintenance, the segmented docking shell structure provides convenience. The structure of the variable diameter section improves the flow characteristics of the airflow and improves the overall performance of the muffler.

[0054] Example 2

[0055] In another typical embodiment of the present invention, Figure 1-Figure 4As shown, a working method of an exhaust muffler is provided, using the exhaust muffler as in Example 1.

[0056] A method for operating an exhaust muffler, comprising:

[0057] The first chamber 8 of the exhaust muffler is connected to the exhaust port of the compressor cylinder through an air inlet pipe, and the exhaust gas is introduced into the chamber;

[0058] After the exhaust gas flows into the first chamber 8, it passes through the first muffler hole, the second chamber 9, the second muffler hole, the third chamber 10, the third muffler hole and the fourth chamber 11 in sequence, and then is discharged through the exhaust pipe 7;

[0059] The exhaust gas flows through the second chamber 9 and then enters the second silencer hole. Under the guidance of the second silencer hole, it enters the third chamber 10 and flows toward the first partition 2 first. After being blocked by the first partition 2, it returns and enters the third silencer hole, thereby weakening the sound intensity.

[0060] A plurality of first silencer holes and second silencer holes are provided, and the exhaust gas flows from the first partition plate 2 to the first silencer holes at the plurality of positions to enter the second chamber 9, and flows from the ring plate 3 to the second silencer holes at the plurality of positions to enter the third chamber 10.

[0061] In the process of airflow from the second chamber 9 to the third chamber 10, multi-position air intake and airflow counteraction are realized. A plurality of second silencer holes distributed in the annular direction are arranged on the ring plate 3, and the exhaust airflow enters the third chamber 10 from the second silencer holes at multiple positions of the ring plate 3 in the annular direction. In addition, the second silencer holes at both ends of the same diameter allow the incoming airflow to form a counteraction. The counteraction of airflow will cause a large amount of kinetic energy to be converted into heat energy and sound energy loss, significantly reduce the energy of the airflow, and weaken the intensity of the sound waves. In addition, the interference of sound waves during the counteraction process further offsets part of the noise energy.

[0062] The second silencer hole is also used to guide the airflow so that the airflow can flow back. The axis of the second silencer hole is inclined relative to the axis of the ring plate 3, and the end connected to the third cavity is inclined toward the first partition 2. This design guides the airflow into the third chamber 10 and then flows toward the first partition 2, and then turns back to enter the third silencer hole after being blocked by the first partition 2. The path and residence time of the airflow in the third chamber 10 are extended, the friction and collision times of the airflow with the chamber wall and the first partition 2 are increased, more airflow energy is consumed, and sound waves have more opportunities to reflect and interfere, further weakening the sound intensity.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An exhaust muffler, characterized in that: It includes a shell, in which a columnar cavity with both ends blocked is formed, a first partition and a second partition are distributed in the cavity along the axial direction at intervals, and the cavity is divided into a first chamber, an intermediate chamber and a fourth chamber, an annular plate is installed between the first partition and the second partition, so that the intermediate chamber is divided into a second chamber outside the annular plate and a third chamber inside the annular plate, a first silencer hole connecting the first chamber and the second chamber is arranged on the first partition, a second silencer hole is arranged on the outer peripheral wall of the annular plate away from one end of the first partition in the axial direction to connect the second chamber and the third chamber; a third silencer hole connecting the third chamber and the fourth chamber is arranged on the second partition; the axis of the second silencer hole is inclined compared to the axis of the annular plate, and one end of the second silencer hole connecting the third chamber is inclined toward the first partition.

2. The exhaust muffler according to claim 1, characterized in that: The first baffle, the second baffle and the ring plate are coaxially distributed. Along the ring direction of the first baffle, a plurality of first silencer holes are evenly distributed on the first baffle, and a plurality of second silencer holes are evenly distributed on the ring plate, so that the airflow passing through the second silencer holes is counteracted along the radial direction of the ring plate.

3. The exhaust muffler according to claim 2, characterized in that: The plurality of second silencer holes are divided into a plurality of pairs, and the second silencer holes of the same pair are distributed at two ends of the same diameter of the ring plate.

4. The exhaust muffler according to claim 1, characterized in that: The outer side of the ring plate forms a cylindrical second chamber, the inner side of the ring plate forms a columnar third chamber, and the first muffler hole flows through the second chamber along the axial length of the ring plate and then enters the second muffler hole.

5. The exhaust muffler according to claim 1 or 4, characterized in that: The first partition plate is provided with an annular groove for accommodating one end of the ring plate on one side facing the middle chamber, and the second partition plate is provided with an annular groove for accommodating one end of the ring plate on one side facing the middle chamber. Both ends of the ring plate are respectively embedded in the annular grooves for sealing.

6. The exhaust muffler according to claim 5, characterized in that: The third muffler hole is coaxially distributed with the second partition plate.

7. The exhaust muffler according to claim 1, characterized in that: The shell comprises a first shell, a second shell and a third shell which are connected in sequence along the axial direction of the cavity. The second shell is cylindrical and is sleeved outside the ring plate.

8. The exhaust muffler according to claim 7, characterized in that: The first shell corresponding to the end of the first chamber near the first partition is provided with a reducing section, and the third shell corresponding to the end of the fourth chamber near the second partition is also provided with a reducing section. The diameter of the reducing section gradually increases along the axis of the ring plate in the direction close to the middle chamber, so that one end of the first shell forms an expansion structure, and one end of the third shell forms a contraction structure.

9. A method for operating an exhaust muffler, using the exhaust muffler as claimed in any one of claims 1 to 8, characterized in that: include: The first chamber of the exhaust muffler is connected to the exhaust port of the compressor cylinder through an intake pipe, and the exhaust gas is introduced into the chamber; After the exhaust gas enters the first chamber, it passes through the first muffler hole, the second chamber, the second muffler hole, the third chamber, the third muffler hole and the fourth chamber in sequence, and is discharged through the exhaust pipe; The exhaust gas flows through the second chamber and then enters the second silencer hole. Under the guidance of the second silencer hole, the exhaust gas flows into the third chamber and flows toward the first partition first. After being blocked by the first partition, it returns and enters the third silencer hole, thereby weakening the sound intensity.

10. The operating method of the exhaust muffler according to claim 9, characterized in that: A plurality of first silencer holes and second silencer holes are provided, and the exhaust gas flows from the first baffle plate to the first silencer holes at the plurality of positions to enter the second chamber, and flows from the ring plate to the second silencer holes at the plurality of positions to enter the third chamber.

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