WO2022104963A1

WO2022104963A1 - High pressure silencing exhaust apparatus

Info

Publication number: WO2022104963A1
Application number: PCT/CN2020/136002
Authority: WO
Inventors: 李悦; 李茂东; 黄国家; 杨波; 周杨飞; 李仕平
Original assignee: 广州特种承压设备检测研究院
Priority date: 2020-11-23
Filing date: 2020-12-14
Publication date: 2022-05-27
Also published as: CN112628597A

Abstract

A high pressure silencing exhaust apparatus comprising a second silencing cavity; the second silencing cavity comprises a housing and a throttle core within the housing and coaxial with same; an inner wall of the housing is provided with an inner threading, an outer wall of the throttle core is provided with an outer threading that matches with the inner threading of the housing, a gas flow channel is formed between the inner threading of the housing and the outer threading of the throttle core, and a gas flow enters from a gas inlet end of the housing and, after passing the throttle core, is discharged outside of the housing. The high pressure silencing exhaust apparatus of the present application implements partitioned pressure reduction and noise reduction by means matching between the inner and outer threadings of the housing and the throttle core, a threading structure can achieve a greater gas flow contact area at a same size, thereby having a compact apparatus structure while ensuring pressure reduction and noise reduction, and also the gas flow flows along a helical surface, and consequently flow is smooth and steady, and good stability is achieved.

Description

High pressure muffler exhaust device

This application claims the priority of the Chinese patent application with an application date of November 23, 2020 and an application number of 202011320380.9, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of product exhaust equipment, for example, to a high-pressure muffler exhaust device.

Background technique

In the fields of power generation, chemical industry, metallurgy, and textile, due to the extensive use of boilers, fans and other equipment, these equipment will generate high-pressure gas and accompanied by large noise, causing noise pollution. Noise pollution will bring greater interference and harm to operators and the surrounding environment. The commonly used technical means to reduce noise pollution is to install mufflers on the airflow passages or in the intake and exhaust systems of aerodynamic equipment, such as blowers, air compressors, boiler exhaust ports, generators, water pumps, etc. It is necessary to ensure that the sound transmission is prevented and the normal passage of air is allowed.

Please refer to FIG. 1 , the patent application No. 201420374530.8 discloses a straight pipe muffler, comprising an outer cylinder 1 , an inlet end plate 2 arranged at the inlet end of the outer cylinder 1 , and an air inlet end plate 2 arranged at the outlet end of the outer cylinder 1 . The air outlet orifice plate 3, the baffle plate 4 with through holes which divide the inside of the outer cylinder 1 into two upper and lower cavities, and the damping orifice plate arranged between the air inlet end plate 2 and the baffle plate 4 5. The air duct 6 arranged between the baffle plate 4 and the air outlet orifice plate 3 , the inner orifice plate 7 and the outer orifice plate 8 sequentially arranged between the air duct 6 and the outer cylinder 1 . The damping orifice plate 5 may be spherical and/or planar and is provided with a plurality of through holes. The side wall of the air duct 6 is provided with a muffler hole, and between the air duct 6 and the inner orifice plate 7 , between the inner orifice plate 7 and the outer orifice plate 8 , and between the outer orifice plate 8 . Damping materials such as glass fiber wool or wave crest sound-absorbing sponge are filled between the orifice plate 8 and the outer cylinder 1 . The airflow enters from the intake end plate 2 , passes through the damping orifice plate 5 to reduce the airflow energy to reduce the airflow noise and then enters the air duct 6 , and then flows to the air duct 6 along the muffler holes on the side wall of the air duct 6 in sequence. The inner orifice plate 7, the outer orifice plate 8 and the outer cylinder 1 are absorbed by the damping material to further reduce the noise, throttling and reducing the pressure through small holes, etc., and cooperate with the vibration isolation material to achieve noise reduction.

However, for high-pressure equipment such as gas cylinders used for storing and transporting hydrogen, due to the need to apply a large pressure to hydrogen when storing hydrogen energy, if the pressure reduction and deceleration are unstable during the process of releasing high-pressure hydrogen, explosions are likely to occur. Safety accident, so it needs its exhaust device to smoothly control the speed of exhaust. In addition, in terms of high-pressure exhaust noise, due to the need to absorb high dynamic loads, more throttling and vibration isolation structures should be set up as much as possible, resulting in a complex structure and large volume of the muffler, and its use environment is limited.

SUMMARY OF THE INVENTION

The present application provides a high-pressure muffler and exhaust device with compact structure and good stability.

The technical solutions adopted in this application are as follows:

A high-pressure sound-absorbing and exhausting device includes a second sound-absorbing cavity; the second sound-absorbing cavity includes a casing and a throttle core arranged in the casing and coaxial with it; the inner wall of the casing is provided with Internal thread, the outer wall of the throttle core is provided with an external thread matched with the internal thread of the casing, and a gas flow channel is formed between the internal thread of the casing and the external thread of the throttle core, and the air flow from The intake end of the casing enters and flows through the throttle core and then is discharged out of the casing.

The high-pressure muffler and exhaust device of the present application cooperates with the inner and outer threads of the throttling core to achieve zoned decompression and noise reduction. The threaded structure can obtain a larger airflow contact area under the same volume, thereby ensuring the decompression drop At the same time, the structure of the device is compact, and the airflow flows along the helical surface, so the flow is smooth and the stability is good.

Optionally, in a cross section perpendicular to the axial direction of the throttle core, the area of the gas flow passage formed between the inner thread of the housing and the outer thread of the throttle core is equal. The gas flow channels with the same area further improve the stability of the gas flow and reduce the impact on the device.

Optionally, it also includes a first muffling cavity communicating with the second muffling cavity; the first muffling cavity is provided with a diffusion part and a drainage hole; the diffusion part is a semi-enclosed frame with an opening at one end body, the drainage hole is arranged on the diffuser to communicate with the first muffler cavity and the second muffler cavity, and the axis of the drainage hole is parallel to the axis of the throttle core; the housing sleeved on the outside of the diffuser, and the opening of the diffuser faces away from the throttle core; the throttle core is fixedly connected with the diffuser; the air flows from the intake end of the first muffler cavity After entering, it enters the casing after passing through the diffuser, flows through the throttling core and then discharges. After the high-pressure airflow is injected into the diffuser with partial pressure, the impact of the airflow on the throttle core can be reduced, and the stability and service life of the device can be improved.

Optionally, the diffuser is a rotating body with the throttle core axis as the rotation axis; along the flow direction of the gas, the cross-sectional area of the inlet end of the diffuser is larger than the cross-sectional area of the outlet end of the diffuser. The airflow shrinks through the diffuser with a gradually smaller cross-sectional area, and then diffuses and injects through the drainage holes, resulting in a steady loss of energy, achieving stable deceleration and decompression, and improving stability.

Optionally, it also includes a third muffler cavity, the third muffler cavity is a semi-enclosed frame body with an opening at one end, the opening of which faces the second muffler cavity and is connected to the casing; The inner wall of the second muffler cavity is provided with a discharge hole that communicates with the outside, and the axis of the discharge hole is parallel to the axis of the throttle core; after the airflow enters from the intake end of the first muffler cavity, it passes through the The diffuser and the orifice are then discharged from the discharge hole. Through the decompression and noise reduction of the first muffler cavity and the second muffler cavity, the frequency of the high-pressure airflow entering the third muffler cavity can be reduced, and the stability of the overall structure can be improved.

Optionally, the diameter of the discharge hole is smaller than the diameter of the drainage hole. In the direction of airflow flow, the diameter of the small holes located in the front is larger than that of the small holes in the rear, which is conducive to achieving stable airflow and multi-stage depressurization.

Optionally, the third muffler cavity is a rotating body with the axis of the throttle core as the axis of rotation; along the flow direction of the gas, the cross-sectional area of the inlet end of the third muffler cavity is greater than the cross-sectional area of the outlet end of the third muffler cavity. cross-sectional area. The third muffler cavity with a gradually smaller cross-sectional area further shrinks the airflow, decompressing and reducing noise.

Optionally, along the flow direction of the gas, the cross-sectional area of the inlet end of the drainage hole and the outlet hole is smaller than the cross-sectional area of the outlet end thereof. When the airflow passes through the drainage holes and the discharge holes, the expansion and decompression are realized.

Optionally, the first muffler cavity further includes a noise reduction cavity disposed between the inlet end of the first muffler cavity and the diffuser; the noise reduction cavity is an axis and the throttle core A rotating body with parallel axes, and its interior is filled with flexible material. The flexible material absorbs the energy of the high pressure gas.

Optionally, it also includes a guide ring sleeved on both ends of the throttle core, and the guide ring is provided with guide fins extending along its radial direction. The deflector rectifies the gas, reduces the generation of gas eddies, further reduces gas noise and improves stability.

Description of drawings

Fig. 1 is the structural representation of a kind of straight pipe muffler in the related art;

2 is a schematic diagram of the overall structure of the high-pressure muffler exhaust device in the application;

Fig. 3 is the front sectional view of the high-pressure muffler exhaust device in the application;

Fig. 4 is a perspective cross-sectional view of the high-pressure muffler exhaust device in the application;

5 is a schematic structural diagram of a first diffuser in the application;

FIG. 6 is a front cross-sectional view of the diffuser in the application;

7 is a front partial cross-sectional view of an embodiment of the application;

FIG. 8 is a schematic view of the structure of the guide ring in the present application.

Detailed ways

Please refer to FIG. 2 to FIG. 4 , the high-pressure muffler and exhaust device of the present application includes a first muffler cavity 10 , a second muffler cavity 20 and a third muffler cavity 30 . The first muffler cavity 10 , the second muffler cavity 20 and the third muffler cavity 30 each have a depressurization and muffling function, and can be independently communicated with a high-pressure gas outlet (not shown) for muffling. , or a free connection and combination to provide a stable noise reduction effect. In this embodiment, the first muffler cavity 10 is communicated with a high-pressure hydrogen gas outlet (not shown), and the high-pressure gas enters the first muffler cavity 10 and then passes through the second muffler cavity 20 in sequence. And the third muffler cavity 30 smoothly decelerates and decompresses and then discharges, so as to reduce the occurrence of safety accidents.

Wherein, the first muffler cavity 10 includes a connector 110 communicating with the high-pressure gas discharge port and a first diffuser 120 . The connector 110 is a cylindrical body with a hollow interior and openings at both ends, and the end connected to the high-pressure gas discharge port is an intake end 111 . Optionally, in a direction parallel to its axis and away from the intake end 111 , the inner diameter of the connecting member 110 decreases sequentially. Please refer to FIG. 5 , the first diffuser 120 is hollow inside and is covered at the end of the connecting member 110 away from the intake end 111 , and is provided with a joint portion 121 and a diffusing portion 122 connected to the connecting member 110 . and a drainage hole 123 disposed on the side wall of the diffuser 122 . The connecting portion 121 is located between the connecting member 110 and the diffusing portion 122 . Optionally, the coupling portion 121 is a hollow cylindrical body coaxial with the connecting member 110 , and the inner diameter of the coupling portion 121 at the connecting portion is equal to the inner diameter of the connecting member 110 . The diffusing portion 121 is a semi-enclosed frame with an opening at one end, and the opening faces the connecting portion 121 . Further, the diffuser 121 is a semi-enclosed frame body with a spherical or truncated cross-sectional area with an opening at the large end, and is parallel to the axis of the connecting piece 110 and away from the connecting piece 110. The cross-sectional area of the diffuser 121 perpendicular to the axis of the connector 110 gradually decreases, that is, along the gas flow direction, the cross-sectional area of the inlet end of the diffuser 121 is larger than the cross-sectional area of the outlet end of the diffuser 121 . The drainage hole 123 communicates the inside and the outside of the first muffler cavity 10, and its axis is parallel to the axis of the connecting piece 110. The parallel airflow is beneficial to the stability of the airflow and reduces the need for the high-pressure muffler exhaust device. impact and improve the stability of the device. Optionally, along the projection with the axial direction of the joint portion 121, a plurality of drainage holes 123 are evenly distributed on the diffusion portion 121 and the axial distances between the drainage holes 123 are equal; further, please refer to FIG. In the plane where the axis of the engaging portion 121 is located, along the direction parallel to the axis of the engaging portion 121 and away from the connecting member 110 , the axis of the drainage hole 123 is parallel to the axis of the engaging portion 121 and the aperture gradually increases, forming expansion hole. Along the gas flow direction, the cross-sectional area of the inlet end of the drainage hole 123 is smaller than the cross-sectional area of the outlet end thereof. Further, the first muffler cavity 10 further includes a plurality of noise reduction cavities 130 disposed between the intake end 111 and the diffuser 122 , and the noise reduction cavity 130 passes through the first muffler cavity. The bracket connected to the inner wall of the body 10 is installed in the connecting piece 110 or the first diffuser 120, the noise reduction cavity 130 is a cylinder whose axis is parallel to the axis of the connecting piece 110, and its interior is filled with resonance A flexible material that acts as sound absorption. Optionally, please refer to FIG. 7 , in a direction parallel to the axis of the connector 110 and away from the connector 110 , a cross section of the noise reduction cavity 130 perpendicular to the axis of the connector 110 The area gradually decreases. Along the gas flow direction, the cross-sectional area of the end of the noise reduction cavity 130 toward the second muffler cavity 20 is the smallest, so that the inner wall of the first muffler cavity 10 and the noise reduction cavity 130 and the noise reduction cavity 130 have the smallest cross-sectional area. Guide passages 140 that are gradually enlarged are formed between the cavities 130 , that is, along the gas flow direction, the cross-sectional area of the inlet end of the guide passage 140 is smaller than the cross-sectional area of the outlet end of the guide passage 140 . In this embodiment, in order to better communicate with the second muffler cavity 20, the connecting member 110 is provided with a first connecting portion 112 connected to the high-pressure gas discharge port, and is connected to the The first connecting portion 112 is connected to the second connecting portion 113, the first connecting portion 112 and the second connecting portion 113 are both coaxial hollow cylinders, and the inner diameter of the first connecting portion 112 is larger than that of the first connecting portion 112. The inner diameter of the second connecting portion 113; the diffusing portion 121 is a hollow circular truncated cone with an opening at its large end, and its large end faces the second connecting portion 113 and is coaxially connected to it; the drainage hole 123 has a diameter of 5 mm and is provided with On the truncated side wall of the diffuser 121 ; the noise reduction cavity 130 is a hollow truncated truncated cone filled with closed-cell foam; the bracket for installing the noise reduction cavity 130 is arranged on the inner wall of the second connection part 113 After entering the first muffler cavity 10 from the intake end 111, the high-pressure gas flows along the first connection part 112, contracts at the second connection part 113, and then follows the guide The diversion channel 140 diffuses, the noise reduction cavity 130 absorbs part of the vibration, and finally shrinks along the side wall of the diffuser 122 and injects into the diversion hole 123. In the process of repeated contraction and expansion, the energy is gradually lost and the deceleration is stably decelerated, thereby improving the stability of deceleration and decompression.

The second muffler cavity 20 includes a casing 210 and a throttle core 220 disposed in the casing 210 and coaxial with the throttle core 220 , and a gas flow is formed between the casing 210 and the throttle core 220 The throttling core 220 decompresses and decelerates the gas in zones. The casing 210 is a hollow cylinder with internal threads on the inner wall. The throttling core 220 is arranged in the casing 210 under the support of a bracket and is coaxial with it. , Cross-sectional shape, the distance between the helix and the axis are matched with the external thread. Optionally, in a cross section perpendicular to the axis of the throttle core 220, the area of the gas flow passage between the housing 210 and the throttle core 220 is kept equal. The inner and outer threads of the casing 210 and the throttle core 220 cooperate with each other to increase the contact area with the air flow under the same volume, compact the device, make the air flow smoothly, and improve the stability of deceleration and pressure reduction. In addition, the throttling core 220 can also be set as a conical screw, and in the cross section perpendicular to the axis of the throttling core 220 , the area of the airflow passage changes according to a certain rule, so as to obtain different deceleration and pressure reduction effects. When communicating with the first muffler cavity 10 , the side of the casing 210 abutting on the air inlet end is sleeved outside the first diffuser 120 . Projected along the axial direction of the throttle core 220, the axial center of the throttle core 220 is located at the center of the end face of the diffuser 122 toward the second muffler cavity 20. Optionally, the diffuser 122 is a rotating body, and is coaxially connected to the throttle core 220 , and the airflow flowing out through the drainage hole 123 flows into the casing 210 and is connected between the casing 210 and the casing 210 . flow between the throttling cores 220 . After the airflow entering the second muffler cavity 20 is injected with partial pressure through the first diffuser 120 of the first muffler cavity 10, the impact of the airflow on the throttle core 220 can be reduced, and the throttle core 220 can be reduced to a certain extent. The stability and service life of the flow core 220 can avoid excessive damage due to short-term airflow. Optionally, the connecting member 110 and the outer side of the casing 210 are both fixed with mutually connected flanges, and the connecting member 110 and the flange of the casing 210 are fixed by screws.

The third muffler cavity 30 is a semi-enclosed frame with an opening at one end, and along the axial direction of the throttle core 220 , the cross-sectional area of the third muffler cavity 30 changes gradually, and along the gas flow direction , the cross-sectional area of the air inlet end of the third muffler cavity 30 is larger than the cross-sectional area of the air outlet end, and the inner wall of the third muffler cavity 30 is provided with a plurality of discharge ports that communicate with the outside world and whose axes are parallel to the airflow direction. hole 310 ; in this embodiment, the axis of the discharge hole 310 is parallel to the axis of the throttle core 220 . The diameter of the discharge holes 310 is smaller than the diameter of the drainage holes 123 , and projected along the axis of the discharge holes 310 , the ratio of the center distance of the adjacent discharge holes 310 to their diameters is 2 to 5 or less. If the ratio of the center distance to the pore size is less than 2, after the airflow passes through the discharge hole 310, the air columns are easily combined together, which affects the stability; if the ratio of the center distance to the pore size is greater than 5, the depressurization ability is low, which affects noise reduction. ability. Through the discharge hole 310, the air flow is decompressed and reduced in noise by the principle of small hole injection, and the air is discharged out of the high-pressure exhaust device. Further, along the gas flow direction, the cross-sectional area of the inlet end of the exhaust hole 310 is smaller than the cross-sectional area of the outlet end thereof. Optionally, flanges connected to each other are fixed on the outer sides of the casing 210 and the third muffler cavity 30 , and the shell 210 and the flanges of the third muffler cavity 30 are fixed by screws. Further, the third muffler cavity 30 is an arc-shaped frame body, and the arc center is located on the side close to the second muffler cavity 20. The arc-shaped structure can not only increase the volume of the third muffler cavity 30 In order to increase the number of discharge holes 310 arranged on the inner wall, and to compact the overall structure size and improve the compactness of the overall structure; optionally, the center of the third muffler cavity 30 is located close to the On the axis of the throttle core 220 on one side of the second muffler cavity 20 , a spherical frame body is formed that is coaxial with the throttle core 220 and protrudes from the side away from the second muffler cavity 20 . In this embodiment, the diameter of the discharge hole 310 is 2 mm, and an excessively small diameter not only increases the difficulty of processing, but also tends to cause blockage during use. In addition, decompression and noise reduction through the first muffler cavity 10 and the second muffler cavity 20 can reduce the frequency of the high-pressure airflow entering the third muffler cavity 30 and improve the stability of the overall structure.

Further, please refer to FIG. 8 , in order to rectify the gas, reduce the generation of gas vortex, further reduce the gas noise and improve the stability, the high-pressure muffler and exhaust device also includes a guide ring fixed at both ends of the throttle core 220 40 , the guide ring 40 includes a ring body 41 and a guide vane 42 . The ring body 41 is coaxial with the throttle core 220 , and the guide vanes 42 extend radially along the ring body 41 and rectify the gas flowing into and out of the throttle core 220 . Optionally, the outer diameter of the ring body 41 is equal to the inner diameter of the casing 210 . When the guide ring 40 is installed in the casing 210 , the outer wall of the ring body 41 and the inner wall of the casing 210 fit and support the throttle core 220 as a bracket. Further, in order to facilitate coaxial connection with the throttle core 220 , the diversion ring 40 further includes a mounting member 43 coaxial with the ring body 41 , the mounting member 43 is annular, and the mounting member 43 The inner diameter is equal to the outer diameter of the two ends of the throttle core 220 , the guide ring 40 is sleeved on both ends of the throttle core 220 through the mounting member 43 , and the guide vane 42 is radially connected to the between the inner wall of the ring body 41 and the outer wall of the mounting member 43 . In this embodiment, the number of the guide vanes 42 is four, and in the plane projected along the axis direction of the ring body 41 , the guide vanes 42 are perpendicular to each other.

Since the total power of turbulent noise is proportional to the square of the nozzle diameter and the eighth power of the fluid velocity, and according to the Lighthill U ⁸ law, the flow velocity of the jet is assumed to be U, and the expression of the total power of turbulent noise is:

in:

c ₀ - speed of sound propagation;

K——Lightill coefficient;

D——Nozzle diameter;

ρ——the density of the fluid;

U - fluid flow rate;

ρ ₀ — density of sound propagation medium;

In the present application, by setting up a three-stage muffler cavity, a graded decompression and noise reduction of the gas is formed. Under the condition that the exhaust pipe port remains unchanged, the decompression and speed reduction can effectively realize the muffler of the high-pressure gas.

Compared with the related art, the high-pressure sound-absorbing and exhausting device of the present application has a plurality of sound-absorbing cavities, which can realize the step-by-step decompression and speed reduction of the high-pressure airflow. The air flow contact area is increased by the threaded structure, the compact device structure, and the "retraction-expansion-retraction-expansion" is used to repeatedly change the direction of the airflow. Sex is high. Further cooperate with flexible materials to absorb gas energy and deflector for rectification, which can well reduce gas noise and improve stability. In addition, there is a structure to reduce the impact of air flow, which can prolong the service life of the device.

Claims

A high-pressure sound-absorbing and exhausting device includes a second sound-absorbing cavity; the second sound-absorbing cavity includes a casing and a throttle core arranged in the casing and coaxial with it; the inner wall of the casing is provided with Internal thread, the outer wall of the throttle core is provided with an external thread matched with the internal thread of the casing, and a gas flow channel is formed between the internal thread of the casing and the external thread of the throttle core, and the air flow from The intake end of the casing enters and flows through the throttle core and then is discharged out of the casing.
The high-pressure muffler and exhaust device according to claim 1, wherein: in a cross section perpendicular to the axial direction of the throttle core, there is a gap between the inner thread of the casing and the outer thread of the throttle core. The formed gas flow channel area is equal.
The high-pressure muffling and exhausting device according to claim 1, further comprising a first muffling cavity communicating with the second muffling cavity; the first muffling cavity is provided with a diffusion part and a drainage hole; the diffusion The part is a semi-enclosed frame with an opening at one end, the drainage hole is arranged on the diffuser to communicate the first muffler cavity and the second muffler cavity, and the axis of the drainage hole is connected to the joint. The axis of the flow core is parallel; the casing is sleeved outside the diffuser, and the opening of the diffuser faces away from the throttle core; the throttle core is fixedly connected with the diffuser; After the intake end of the first muffler cavity enters, it enters the casing after passing through the diffuser, and flows through the throttling core before being discharged.
The high-pressure muffler exhaust device according to claim 3, wherein: the diffuser is a rotating body with the axis of the throttle core as the rotation axis; along the flow direction of the gas, the cross section of the intake end of the diffuser is The area is larger than the cross-sectional area of its outlet end.
The high-pressure muffler and exhaust device according to claim 3, further comprising a third muffler cavity, wherein the third muffler cavity is a semi-enclosed frame with an opening at one end, the opening of which faces the second muffler cavity and connected with the housing; the inner wall of the second muffler cavity is provided with a discharge hole communicating with the outside, the axis of the discharge hole is parallel to the axis of the throttle core; the air flow from the first muffler cavity After the intake end enters, it passes through the diffuser and the throttle core in sequence, and then is discharged from the discharge hole.
The high-pressure muffler and exhaust device according to claim 5, wherein the diameter of the discharge hole is smaller than the diameter of the drainage hole.
The high-pressure muffler and exhaust device according to claim 6, wherein: the third muffler cavity is a rotating body with the throttle core axis as the rotation axis; along the flow direction of the gas, the third muffler cavity The cross-sectional area of the gas inlet end is greater than the cross-sectional area of the gas outlet end.
The high-pressure muffler and exhaust device according to claim 7, wherein: along the flow direction of the gas, the cross-sectional area of the inlet end of the inflow hole and the outlet hole is smaller than the cross-sectional area of the outlet end thereof.
The high-pressure muffler exhaust device according to claim 7, wherein: the first muffler cavity further comprises a noise reduction cavity disposed between the intake end of the first muffler cavity and the diffuser; the The noise reduction cavity is a rotating body whose axis is parallel to the axis of the throttle core, and the interior of which is filled with flexible materials.
The high-pressure muffler and exhaust device according to claim 7, further comprising a guide ring sleeved on both ends of the throttle core, and the guide ring is provided with guide fins extending along its radial direction.