Exhaust gas recirculation internal combustion engine intake muffler

Abstract

This invention discloses an exhaust gas recirculation (EGR) intake muffler for an internal combustion engine. The muffler cylinder contains a perforated central tube and a Venturi tube. Helical blades are wound around the perforated central tube. A core guide tube is fitted onto the Venturi tube shell; a middle ring guide tube is spaced apart on the core guide tube; and an outer ring guide tube is spaced apart on the middle ring guide tube. The Venturi tube is located on the intake side of the muffler cylinder, and the perforated central tube is located on the exhaust side. The throat section of the Venturi tube connects to a recirculating exhaust gas pipe and a balancing gas pipe. The recirculating exhaust gas pipe leads to an exhaust gas return pipe via an exhaust gas balancing valve, and the balancing gas pipe leads to the balancing chamber of the exhaust gas balancing valve. The exhaust gas balancing valve includes a valve seat, a valve body, and a balancing diaphragm. The balancing diaphragm is clamped in the balancing chamber between the valve seat and the valve body. A sliding core is slidably mounted on the valve body, and a valve disc is fixedly installed on the valve body. This intake muffler not only achieves wideband noise reduction, but also enables automatic control of the intake volume of recirculated exhaust gas.

Description

Technical Field

[0001] This invention relates to an intake muffler for an internal combustion engine, and more particularly to an intake muffler for an internal combustion engine that directs a portion of the exhaust gas into the intake side for re-intake. Background Technology

[0002] Internal combustion engines, such as diesel engines, gasoline engines, and rotary engines, have advantages such as high thermal efficiency, wide power and speed range, and good maneuverability. However, the operation of internal combustion engines will bring noise pollution and exhaust pollution to the environment. The noise pollution of internal combustion engines mainly consists of aerodynamic noise, combustion noise, and mechanical noise. These noise sources work together to make the noise of internal combustion engines reach more than 110 decibels, and even exceed 130 decibels for high-speed or large internal combustion engines.

[0003] Internal combustion engine intake supercharging, including turbocharging and supercharging, allows for more complete fuel combustion, thus significantly increasing engine power and torque. Both types of supercharging increase the amount of air entering the engine, leading to more complete combustion and consequently, significantly improved engine power and torque. However, both turbocharging and supercharging generate additional noise, resulting in extremely high noise levels in internal combustion engines.

[0004] Internal combustion engines release nitrogen oxides through their exhaust systems during operation. These exhaust gases not only cause air pollution and ecological damage but also endanger health and public safety. Exhaust gas recirculation (EGR) technology addresses this by diverting a portion of the exhaust gases from the engine into the intake system, allowing them to mix and reduce the oxygen concentration in the intake air, thus suppressing nitrogen oxide production. The Venturi tube installed in the EGR system utilizes the negative pressure effect generated when fluid flows through a expanding structure to effectively introduce exhaust gases into the intake system, significantly reducing exhaust flow resistance and making it easier to achieve a higher EGR rate. Currently, the Venturi tube can be connected to the intake manifold in parallel or in series. When using a series connection, the EGR rate is adjusted using a flow control valve in the EGR pipeline, making it difficult to simultaneously meet the requirements of high and low loads. At low loads, the intake airflow is small. To ensure a sufficient EGR rate at low loads, the throat diameter of the venturi tube must be reduced. However, at high loads, the flow rate increases and the velocity accelerates, leading to increased flow losses caused by the venturi tube. When the venturi tube is connected in parallel with the intake pipe, a butterfly valve is installed on the intake pipe to adjust the flow rate through the venturi tube, thereby regulating the EGR rate. This structure indirectly regulates the venturi tube flow rate by adjusting the intake pipe flow rate, which cannot effectively control the intake volume and flow rate of recirculated exhaust gas, thus hindering EGR rate stability. Furthermore, whether the venturi tube and intake pipe are connected in series or in parallel, they occupy a significant amount of space, making their structures relatively complex. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide an intake muffler for an exhaust gas recirculation internal combustion engine that can not only achieve wide-band noise reduction and low intake resistance, but also achieve automatic control of the intake volume of recirculated exhaust gas.

[0006] To solve the above-mentioned technical problems, the present invention provides an exhaust gas recirculation internal combustion engine intake muffler, comprising a muffler body, wherein a perforated central tube and a Venturi tube are disposed at a distance from each other at the center of the cavity of the muffler body; a helical blade is wound on the perforated central tube; a core guide tube is fitted on the Venturi tube shell of the Venturi tube, a middle ring guide tube is fitted on the core guide tube at intervals, and an outer ring guide tube is fitted on the middle ring guide tube at intervals;

[0007] The Venturi tube is located on the air inlet side of the muffler cylinder, and the perforated center tube is located on the air outlet side of the muffler cylinder; the throat section of the Venturi tube is connected to a circulating exhaust gas pipe and a balancing gas pipe, the circulating exhaust gas pipe leads to the exhaust gas return pipe via the exhaust gas balancing valve, and the balancing gas pipe leads to the balancing chamber of the exhaust gas balancing valve.

[0008] Furthermore, the exhaust gas balancing valve includes a valve seat, a valve body, and a balancing diaphragm. The balancing diaphragm is clamped in a balancing cavity between the valve seat and the valve body, which are fixedly connected to each other. A sliding core is slidably disposed on the valve body. One end of the sliding core is fixedly installed on the balancing diaphragm, and the other end of the sliding core corresponds to the valve disc, which is fixedly installed on the valve body.

[0009] Furthermore, the balancing diaphragm divides the balancing chamber into a left balancing chamber and a right balancing chamber; the circulating waste gas pipe fixedly connected to the valve seat is connected to the right balancing chamber of the balancing chamber; the valve body is provided with a valve body air passage; the balancing gas pipe passes through the valve body air passage to the left balancing chamber of the balancing chamber.

[0010] Furthermore, a through-hole is provided at the center of the slide core, and the slide core sealing surface on the slide core corresponds to the valve disc sealing surface on the valve disc; the slide core is slidably supported in the slide core hole of the valve body by the slide core seal.

[0011] Furthermore, a valve cover is fixedly installed on the valve body, and an exhaust gas return pipe is fixed on the valve cover; an exhaust gas chamber is provided between the valve cover and the valve body, and the exhaust gas return pipe is connected to the exhaust gas chamber of the valve cover; the sliding core sealing surface and the valve disc sealing surface are located in the exhaust gas chamber of the valve body, and the exhaust gas chamber of the valve body, which is connected to the exhaust gas chamber of the valve cover, is provided on the valve body; the exhaust gas chamber of the valve cover passes sequentially through the exhaust gas chamber of the valve body, the gap between the sliding core sealing surface and the valve disc sealing surface, and the balance right chamber of the balance chamber through the sliding core air passage.

[0012] Furthermore, the cylinder wall of the silencer body adopts a double-layer structure, and the cavity of the cylinder wall is filled with sound-absorbing material. The inner cylinder wall plate of the silencer body is a perforated plate; the perforation rate of the perforated plate is 25%-30%, and the diameter of the perforation is 4mm-6mm.

[0013] Furthermore, the outer ring guide tube, the middle ring guide tube, and the core guide tube all have a double-layer structure. The cavity of the tube wall is filled with sound-absorbing material, and the wall plate is a perforated plate with a perforation rate of 25%-30% and a perforation diameter of 4mm-6mm.

[0014] Furthermore, the perforation rate of the tube wall of the perforated central tube is 25%-30%, and the perforation diameter is 4mm-6mm; the spiral blade adopts a double-layer structure, and the blade surface cavity of the spiral blade is filled with sound-absorbing material, the perforation rate of the spiral blade surface is 25%-30%, and the perforation diameter is 4mm-6mm.

[0015] Furthermore, the perforated central tube and the Venturi tube are located on the center line of the muffler cylinder; the perforated central tube is supported on the inner wall of the muffler cylinder by a central tube support rod; the Venturi tube, core guide tube, middle ring guide tube and outer ring guide tube, which are nested together, are supported on the inner wall of the muffler cylinder by guide tube support rods.

[0016] In this invention, a core guide tube, a middle ring guide tube, and an outer ring guide tube are sequentially and spaced apart between the venturi tube on the air inlet side of the muffler body. Part of the pressurized airflow enters the cavity of the venturi tube, while the other part flows through the spaced channels between the core guide tube, the middle ring guide tube, and the outer ring guide tube. Since the core guide tube, the middle ring guide tube, and the outer ring guide tube all adopt a double-layer structure, the double-layer cylinder wall cavity is filled with sound-absorbing material, and the cylinder wall plate is a perforated plate. The perforated plate and the sound-absorbing material constitute a resistive muffler, which uses friction, viscosity, and damping to convert sound energy into heat energy dissipation, and has good mid- and high-frequency noise reduction performance. Furthermore, because a perforated central tube is installed on the outlet side of the muffler cylinder, and helical blades are wound around the perforated central tube, the perforations on the perforated central tube absorb and reduce noise generated during gas flow. Part of the gas flows along the helical channel between the muffler cylinder and the helical blades, while another part enters the perforated central tube and flows towards the outlet. This not only creates swirling disturbances between the incoming gas and the recirculated exhaust gas, making the intake and recirculated exhaust gas more uniform, but also increases the contact area and contact length between the noise and the blades, improving the high-frequency silencer effect. The perforated central tube and the Venturi tube are spaced apart, creating an expanding and contracting airflow. The abrupt changes in the cross-section of the expanding and contracting pipe cause abrupt changes in acoustic impedance, altering the direction of sound wave propagation and creating reflections and interference to achieve the silencing of mid-to-low frequency noise. The Venturi tube and the perforated central tube are on the same centerline, forming a straight-through structure, which has the advantages of smooth gas flow and low flow resistance. Furthermore, because the air intake channels between the core guide tube, the middle ring guide tube, and the outer ring guide tube form a parallel flow structure with the venturi tube, the structure occupies less space and is more compact. The throat section of the venturi tube connects to the recirculating waste gas pipe and the balancing pipe. The recirculating waste gas pipe leads to the waste gas return pipe via the waste gas balancing valve, and the balancing pipe leads to the balancing chamber of the waste gas balancing valve. The balancing diaphragm in the balancing chamber can change and adjust the opening between the valve disc and the sliding core cover according to the pressure difference between the two chambers of the balancing diaphragm, thereby changing the intake volume of the recirculated waste gas to automatically adjust the EGR rate. When the flow rate is high under high operating conditions, the air pressure in the throat section of the venturi tube decreases, and the balancing diaphragm drives the sliding core to move to the left, making the gap between the valve disc and the sliding core sealing surface smaller, and the flow rate of the recirculated waste gas decreases. Most of the intake gas flows into the inlet from the guide tube interval and the venturi tube, and a small portion of the recirculated waste gas flows into the venturi tube. When the flow rate is low under low operating conditions, the balancing diaphragm drives the sliding core to move to the right, making the gap between the valve disc and the sliding core sealing surface larger, and the flow rate of the recirculated waste gas increases, allowing more recirculated waste gas to enter the intake flow. The exhaust gas balancing valve in this structure is reasonably designed and ingeniously constructed, and can automatically regulate the flow rate of circulating exhaust gas based on the air pressure on both sides of the diaphragm. Attached Figure Description

[0017] The exhaust gas recirculation internal combustion engine intake muffler of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a cross-sectional structural diagram of a specific embodiment of the exhaust gas recirculation internal combustion engine intake muffler of the present invention;

[0019] Figure 2 yes Figure 1 An enlarged structural diagram of the exhaust gas balancing valve in the embodiment shown.

[0020] Figure 3 yes Figure 2 Cross-sectional view of the structure after removing the valve cover and circulating exhaust pipe;

[0021] Figure 4 yes Figure 3 The left view;

[0022] Figure 5 yes Figure 2 Front view of the middle valve disc;

[0023] Figure 6 yes Figure 5 Left sectional view;

[0024] Figure 7 yes Figure 2 Main sectional view of the middle sliding core.

[0025] In the diagram, 1—silencer cylinder, 2—balance air pipe, 3—circulating exhaust gas pipe, 4—exhaust gas balance valve, 401—valve seat, 402—balance diaphragm, 403—valve body, 404—valve body air passage, 405—valve cover, 406—sliding core, 407—valve disc, 408—valve cover exhaust chamber, 409—valve body exhaust chamber, 410—sliding core seal, 411—sliding core air passage, 412—balance chamber, 413—valve disc sealing surface, 414—sliding core sealing surface, 415—diaphragm 416—Valve disc flow passage hole, 5—Exhaust gas return pipe, 6—Rear end flange of cylinder, 7—Central tube support rod, 8—Perforated central tube, 9—Helical blade, 10—Guide tube support rod, 11—Middle ring guide tube, 12—Middle ring guide tube, 13—Core guide tube, 14—Venturi tube, 15—Expansion section, 16—Venturi tube shell, 17—Throat section, 18—Front end flange of cylinder, 19—Contraction section, 20—Venturi inner tube, 21—Venturi tube support rod. Detailed Implementation

[0026] like Figure 1The exhaust gas recirculation (EGR) internal combustion engine intake muffler shown includes a muffler body 1, which is a cylindrical steel structure with a double-layer structure. The inner wall of the muffler body 1 is filled with sound-absorbing material, such as rock wool or glass fiber. The inner wall of the muffler body 1 is a perforated plate with a perforation rate of 30% and a perforation diameter of 5 mm. A front flange 18 is fixedly installed at the intake port of the muffler body 1, and a rear flange 6 is fixedly installed at the outlet port of the muffler body 1.

[0027] A perforated central tube 8 and a venturi tube 14 are disposed at a distance from each other inside the cavity of the muffler body 1. The perforated central tube 8 is located on the side of the air outlet port of the muffler body 1, and the venturi tube 14 is located on the side of the air inlet port of the muffler body 1.

[0028] A perforated central tube 8 is positioned at the center of the cavity of the muffler body 1, and is supported by a support rod 7 on the inner wall of the muffler body 1. The perforated central tube 8 is located at the centerline of the muffler body 1. The perforation rate of the tube wall of the perforated central tube 8 is 25%–30%, and the perforation diameter is 4mm–6mm. Expansion cavities are formed at both ends of the perforated central tube 8. A helical blade 9 is wound around the perforated central tube 8. The helical blade 9 has a perforation rate of 25% and a perforation diameter of 5mm. The helical blade 9 adopts a double-layer structure, and the cavity between the blade surfaces of the helical blade 9 is filled with sound-absorbing material, which is rock wool or glass fiber.

[0029] The Venturi tube 14 includes a Venturi tube shell 16 made of rolled steel plate. The Venturi tube shell 16 is a circular tube structure. A Venturi inner tube 20 is fixedly installed inside the cavity of the Venturi tube shell 16. The Venturi inner tube 20 is also a perforated plate. Sound-absorbing material is filled between the Venturi tube shell 16 and the Venturi inner tube 20. The Venturi inner tube 20 is a reducing tube, so that the cavity of the Venturi tube 14 forms a contraction section 19, a throat section 17, and an expansion section 15. The front end of the Venturi tube shell 16 (near the air inlet port of the muffler body 1) is supported on the inner wall of the muffler body 1 by a Venturi tube strut 21.

[0030] A core guide tube 13 is fitted at the rear end of the Venturi tube shell 16 of the Venturi tube 14. A middle ring guide tube 12 is fitted at intervals around the core guide tube 13, and an outer ring guide tube 11 is fitted at intervals around the middle ring guide tube 12. The outer ring guide tube 11 is fixedly installed on the inner wall of the muffler body 1. The two ends of the core guide tube 13, the middle ring guide tube 12, and the outer ring guide tube 11 are respectively fixedly installed on the inner wall of the muffler body 1 and the Venturi tube shell 16 via corresponding guide tube support rods 10. The lengths of the core guide tube 13, the middle ring guide tube 12, and the outer ring guide tube 11 are shorter than the length of the Venturi tube 14 to ensure good sound absorption and smooth air intake. Preferably, the lengths of the core guide tube 13, the middle ring guide tube 12, and the outer ring guide tube 11 are 1 / 3 to 2 / 3 of the length of the Venturi tube 14. The centerlines of the Venturi tube 14 and the perforated center tube 8 are located on the centerline of the silencer body 1. The core guide tube 13, the middle ring guide tube 12 and the outer ring guide tube 11 all have a double-layer structure. The hollow cavity of the tube wall is filled with sound-absorbing material, which is still made of rock wool or glass fiber. The wall panel is a perforated plate with a perforation rate of 25%-30% and a perforation diameter of 4mm-6mm.

[0031] The throat section 17 of the Venturi 14 connects a recirculating exhaust gas pipe 3 and a balancing gas pipe 2. The diameter of the recirculating exhaust gas pipe 3 is larger than that of the balancing gas pipe 2. The recirculating exhaust gas pipe 3 leads to the exhaust gas return pipe 5 via the exhaust gas balancing valve 4, and the balancing gas pipe 2 leads to the balancing chamber 412 of the exhaust gas balancing valve 4. The centerline of the slide core 406 in the exhaust gas balancing valve 4 is arranged horizontally to avoid the interference of gravity on the movement of the slide core.

[0032] like Figure 2 , Figure 3 and Figure 4 As shown, the exhaust gas balancing valve 4 includes a valve seat 401, a balancing diaphragm 402, and a valve body 403. The opposing surfaces of the valve seat 401 and the valve body 403 are concave surfaces. The valve seat 401 and the valve body 403 are fixedly connected to each other by bolts. The balancing diaphragm 402 is fixedly clamped between the two. The balancing diaphragm 402 is located in the balancing cavity 412 formed by the opposing concave surfaces of the valve seat 401 and the valve body 403. The balancing cavity 412 is divided into a non-connected balancing left cavity and a balancing right cavity by the balancing diaphragm 402 (the balancing left cavity and balancing right cavity here are only for the convenience of description and do not limit their positions). A circulating exhaust gas pipe 3 is glued to the valve seat 401 with adhesive. The circulating exhaust gas pipe 3 is a flexible hose made of polymer material. The circulating exhaust gas pipe 3 leads to the balancing right cavity of the balancing cavity 412 through the central hole on the valve seat 401.

[0033] A slide core 406 is slidably mounted on the valve body 403, and a through slide core air passage 411 is provided at the center of the slide core 406. A slide core hole is provided at the center of the valve body 403, and two slide core seals 410 are embedded in the hole wall. An oil-receiving groove is also provided on the hole wall of the two slide core seals 410. The groove is filled with lubricating oil to improve the sliding flexibility of the slide core 406. The slide core seals 410 are common O-rings. The centerline of the slide core 406 and its reciprocating movement direction are both located on the horizontal plane to avoid the influence of gravity on the movement sensitivity of the slide core 406.

[0034] One end of the slide core 406 is fixedly mounted at the center of the balance diaphragm 402, and the slide core air passage 411 of the slide core 406 leads to the right balance chamber of the balance chamber 412. The other end of the slide core 406 corresponds to the position of the valve disc 407, which is fixedly mounted on the valve body 403. The slide core sealing surface 414 at this end of the slide core 406 corresponds to the valve disc sealing surface 413 on the valve disc 407.

[0035] A valve body air passage 404 is provided on the valve body 403, and a balance air pipe 2 is also connected to the valve body 403. The balance air pipe 2 leads to the balance left chamber of the balance chamber 412 through the valve body air passage 404. A valve cover 405 is fixedly installed on the other side of the valve body 403. A recess is provided on the mounting surface of the valve cover 405. The recess on the valve cover 405 and the valve body 403 form a valve cover exhaust gas chamber 408. An exhaust gas return pipe 5 is glued to the valve cover 405 with adhesive. The exhaust gas return pipe 5 is connected to the valve cover exhaust gas chamber 408, and the other end of the exhaust gas return pipe 5 leads to the exhaust gas discharge pipe of the internal combustion engine.

[0036] A valve body exhaust chamber 409 is provided between the valve disc 407 and the valve body 403. The sliding core sealing surface 414 of the sliding core 406 and the valve disc sealing surface 413 of the valve disc 407 are both located in the valve body exhaust chamber 409. When the sliding core sealing surface 414 and the valve disc sealing surface 413 separate to form an exhaust gas flow gap, the valve body exhaust chamber 409 is connected to the sliding core air passage 411 through the exhaust gas flow gap.

[0037] like Figure 5 , Figure 6 As shown, the valve disc 407 has a disc-shaped structure, with a boss on one side of the disc and an annular valve disc sealing surface 413 on the boss. The disc-shaped valve disc 407 also has three valve disc flow passage holes 416 with a through groove structure, which surround the periphery of the central boss of the valve disc.

[0038] like Figure 7As shown, the slide core 406 has a cylindrical structure. One end of the slide core 406 has an annular groove-shaped diaphragm mounting groove 415 on its outer periphery. The end face of the other end of the slide core 406 is the slide core sealing surface 414, which corresponds to the valve disc sealing surface 413 on the valve disc 407. A through slide core air passage 411 is provided in the core of the slide core 406, and a groove is provided on the outer tube surface of the slide core 406. This groove can form a lubricating oil reservoir between the slide core holes of the valve body 403 and can also limit the sliding stroke of the slide core 406 on the valve body 403.

[0039] When the flow rate is high under high operating conditions, the air pressure in the throat section 17 of the Venturi tube 14 decreases. The balance diaphragm 402 drives the slide core 406 to move to the left, which reduces the gap between the valve disc 407 and the slide core sealing surface 414, thus decreasing the flow rate of the recirculated waste gas. Most of the intake gas flows into the inlet from the guide tube gap and the Venturi tube, while a small portion of the recirculated waste gas flows into the Venturi tube 14. When the flow rate is low under low operating conditions, the balance diaphragm 402 drives the slide core 406 to move to the right, which increases the gap between the valve disc 407 and the slide core sealing surface 414, increasing the flow rate of the recirculated waste gas and allowing more recirculated waste gas to enter the intake flow.

[0040] The intake air mixed with the recirculated exhaust gas flows backward through the Venturi tube 14 and mixes with the intake air that flows in intermittently through the core guide tube 13, the middle ring guide tube 12 and the outer ring guide tube 11 before continuing to flow backward. The spiral blades 9 make the intake air more uniformly mixed and enter the intake port of the internal combustion engine. This structure not only achieves uniform mixing of intake air and recirculated exhaust gas, but also significantly reduces noise during the intake process.

[0041] The above are only some preferred embodiments of the present invention, but the present invention is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. An intake muffler for an exhaust gas recirculation internal combustion engine, comprising a muffler body (1), characterized in that: The silencer cylinder (1) has a perforated central tube (8) and a venturi tube (14) positioned at a distance from each other at the center of the cylinder cavity; a helical blade (9) is wound around the perforated central tube (8); a core guide tube (13) is fitted onto the venturi tube shell (16) of the venturi tube (14), a middle ring guide tube (12) is fitted onto the core guide tube (13) at intervals, and an outer ring guide tube (12) is fitted onto the middle ring guide tube (12) at intervals. 11); The Venturi tube (14) is located on the air inlet side of the muffler body (1), and the perforated center tube (8) is located on the air outlet side of the muffler body (1); the throat section (17) of the Venturi tube (14) is connected to the circulating exhaust gas pipe (3) and the balancing gas pipe (2), the circulating exhaust gas pipe (3) is connected to the exhaust gas return pipe (5) via the exhaust gas balancing valve (4), and the balancing gas pipe (2) is connected to the balancing chamber (412) of the exhaust gas balancing valve (4).

2. The exhaust gas recirculation internal combustion engine intake muffler according to claim 1, characterized in that: The exhaust gas balancing valve (4) includes a valve seat (401), a valve body (403), and a balancing diaphragm (402). The balancing diaphragm (402) is sandwiched in a balancing cavity (412) between the valve seat (401) and the valve body (403) which are fixedly connected to each other. A sliding core (406) is slidably arranged on the valve body (403). One end of the sliding core (406) is fixedly installed on the balancing diaphragm (402), and the other end of the sliding core (406) corresponds to the valve disc (407). The valve disc (407) is fixedly installed on the valve body (403).

3. The exhaust gas recirculation internal combustion engine intake muffler according to claim 1 or 2, characterized in that: The balancing diaphragm (402) divides the balancing chamber (412) into a left balancing chamber and a right balancing chamber; the circulating waste gas pipe (3) fixedly connected to the valve seat (401) is connected to the right balancing chamber of the balancing chamber (412); the valve body (403) is provided with a valve body air passage (404); the balancing air pipe (2) is connected to the left balancing chamber of the balancing chamber (412) through the valve body air passage (404).

4. The exhaust gas recirculation internal combustion engine intake muffler according to claim 3, characterized in that: The center of the slide core (406) is provided with a through slide core air passage (411), and the slide core sealing surface (414) on the slide core (406) corresponds to the valve disc sealing surface (413) on the valve disc (407); the slide core (406) is slidably supported in the slide core hole of the valve body (403) by the slide core seal (410).

5. The exhaust gas recirculation internal combustion engine intake muffler according to claim 4, characterized in that: A valve cover (405) is fixedly installed on the valve body (403), and a waste gas return pipe (5) is fixed on the valve cover (405); a valve cover waste gas chamber (408) is provided between the valve cover (405) and the valve body (403), and the waste gas return pipe (5) is connected to the valve cover waste gas chamber (408); the sliding core sealing surface (414) and the valve disc sealing surface (413) are located in the valve body waste gas chamber (409), and the valve body waste gas chamber (409) connected to the valve cover waste gas chamber (408) is set on the valve body (403); the valve cover waste gas chamber (408) passes through the gap between the valve body waste gas chamber (409), the sliding core sealing surface (414) and the valve disc sealing surface (413), and the sliding core air passage (411) to the balance right chamber of the balance chamber (412).

6. The exhaust gas recirculation internal combustion engine intake muffler according to claim 1, characterized in that: The silencer cylinder (1) has a double-layer structure. The cylinder wall cavity is filled with sound-absorbing material. The inner cylinder wall plate of the silencer cylinder (1) is a perforated plate. The perforation rate of the perforated plate is 25%-30%, and the perforation diameter is 4mm-6mm.

7. The exhaust gas recirculation internal combustion engine intake muffler according to claim 1, characterized in that: The outer ring guide tube (11), the middle ring guide tube (12) and the core guide tube (13) all adopt a double-layer structure. The cavity of the tube wall is filled with sound-absorbing material. The wall plate of the tube wall is a perforated plate with a perforation rate of 25%-30% and a perforation diameter of 4mm-6mm.

8. The exhaust gas recirculation internal combustion engine intake muffler according to claim 1, characterized in that: The perforated central tube (8) has a perforation rate of 25%-30% and a perforation diameter of 4mm-6mm; the spiral blade (9) adopts a double-layer structure, and the blade surface cavity of the spiral blade (9) is filled with sound-absorbing material, the perforation rate of the spiral blade surface is 25%-30%, and the perforation diameter is 4mm-6mm.

9. The exhaust gas recirculation internal combustion engine intake muffler according to claim 1, 6, 7 or 8, characterized in that: The perforated central tube (8) and the venturi tube (14) are located on the center line of the muffler body (1); the perforated central tube (8) is supported on the inner wall of the muffler body (1) by the central tube support rod (7); the venturi tube (14), the core guide tube (13), the middle ring guide tube (12) and the outer ring guide tube (11) which are nested together are supported on the inner wall of the muffler body (1) by the guide tube support rod (10).

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