Engine exhaust silencer

Abstract

The invention discloses an engine exhaust silencing device, which belongs to the technical field of engine exhaust silencing, and comprises a sound insulation cover, the sound insulation cover comprises a frame, an embedded sound absorption plate and a sound absorption partition plate are fixedly mounted in the frame, the sound absorption partition plate divides the sound insulation cover into a first sound absorption chamber and a second sound absorption chamber, an engine is arranged in the first sound absorption chamber, and the second sound absorption chamber is arranged in the second sound absorption chamber; the top of the first sound absorption chamber communicates with an axial flow fan, and the top of the axial flow fan communicates with an air inlet silencer. Through cooperation of the air inlet silencer, the air exhaust silencer, the embedded sound absorption plate, the sound absorption partition plate and the first silencing mechanism, the multiple silencing effect of engine exhaust is achieved, the vibration state of the sound absorption partition plate can be monitored and adjusted in real time through the rotating arm and the swing mechanism, and sound waves generated by exhaust are eliminated as much as possible; and by arranging the switching mechanism and the second silencing mechanism, the silencing effect can be improved when the gas displacement of the engine is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of engine exhaust silencing, and in particular to an engine exhaust silencing device. Background Art

[0002] A trenching machine, also known as a slotting machine, is a mechanical device used to excavate trenches from the ground surface during the construction of underground continuous walls. During operation, a slotted hole of a specified width and depth is excavated in the soil or rock mass based on ground conditions and project design. A rebar cage is then placed and concrete is poured to form the underground continuous wall. This machine is commonly used in the open-cut construction of subway stations and tunnel retaining structures.

[0003] With the progress of society and the development of cities, people's living standards are constantly improving, and urban subway transportation has become a matter of vital importance to our lives. China currently boasts one of the fastest-growing urban rail transit systems in the world. Based on urban planning, subway stations are generally located in key passenger flow distribution points, such as residential and commercial areas, to facilitate public transportation. Factors such as land use, convenient connections to other modes of transportation, and surrounding environmental conditions are also considered. When constructing the outer shell of a subway station, such as the underground diaphragm wall, a trenching machine is used to form a deep trench around the foundation pit. A rebar cage is then hoisted into the trench and concrete is poured to create a reinforced concrete wall section, protecting the pit and its surroundings.

[0004] The trenching machine also poses a major hidden danger to environmental noise pollution during the construction process. During subway construction, the trenching machine often receives complaints from surrounding residents due to its excessive noise, forcing the construction to stop, which directly affects the construction period. The current trenching machine engine silencer usually adopts the traditional engine exhaust silencer, which can only achieve basic silencer effect and cannot be adjusted in real time according to the exhaust volume and noise value. The traditional silencer usually adopts a fixed structure design and cannot adjust the silencer structure according to changes in the engine operating state (such as speed, load, exhaust volume, etc.), resulting in unsatisfactory silencer effect; therefore, we propose an engine exhaust silencer to solve this problem. Summary of the Invention

[0005] The object of the present invention is to provide an engine exhaust muffler to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An engine exhaust silencer comprises: a soundproof enclosure, the soundproof enclosure comprising a frame, an embedded sound-absorbing panel and a sound-absorbing baffle fixedly mounted within the frame, the sound-absorbing baffle dividing the soundproof enclosure into a first sound-absorbing chamber and a second sound-absorbing chamber, the engine being disposed within the first sound-absorbing chamber, the top of the first sound-absorbing chamber being connected to an axial flow fan, the top of the axial flow fan being connected to an air intake muffler, the air intake muffler comprising an air intake housing and a plurality of first sound-absorbing sheets, the front side of the first sound-absorbing chamber being connected to an exhaust muffler, the exhaust muffler comprising an exhaust housing and a plurality of second sound-absorbing sheets;

[0008] The rear side of the exhaust housing is provided with a first silencer mechanism and a second silencer mechanism, the first silencer mechanism comprising: a first sound-absorbing frame, a first rear baffle, a first rear baffle, a first front baffle, a first air intake pipe, a first air return pipe and a first exhaust pipe, the second silencer mechanism comprising: a second sound-absorbing frame, a second rear baffle, a second rear baffle, a second front baffle, a second front baffle, a second air intake pipe, a second air return pipe and a second exhaust pipe, a switching mechanism is provided on the rear side of the first sound-absorbing frame, the switching mechanism comprising: a connecting frame, an annular plate, a connecting spring, a rotating drum, a rotating ring, an L-frame, a first sliding frame, a second sliding frame, a connecting rod and an abutting wheel, the connecting frame is slidably installed in the first sound-absorbing frame, and the connecting frame is adapted to the second sound-absorbing frame;

[0009] A rotating plate is installed inside the frame for rotation, a controller and a swing mechanism are set on the top of the rotating plate, acceleration sensors are set on both sides of the sound-absorbing partition, and the swing mechanism includes: a drive motor, a rotating arm, a connecting frame, a cross bar, a connecting frame, a sliding seat, a slide rail and a connecting column.

[0010] Preferably, the frame includes: a longitudinal beam, a connecting beam and a curved beam, a mounting plate is fixedly installed on the outer side of the longitudinal beam, both ends of the connecting beam are fixedly connected to the corresponding mounting plates, both ends of the curved beam are fixedly connected to the corresponding connecting beams, fixed shafts are fixedly installed on both sides of the curved beam, the rotating plate is rotatably sleeved on the outer side of the fixed shaft, a plurality of first reserved holes are opened on the mounting plate, and a plurality of second reserved holes are opened on both ends of the connecting beam.

[0011] Preferably, the controller, slide rail and drive motor are all fixedly mounted on the bottom of the curved beam, one end of the rotating arm is fixedly mounted on the output shaft of the drive motor, and the other end of the rotating arm is rotatably mounted on the top of the connecting frame, and the connecting frame is slidably sleeved on the outer side of the cross bar, and one end of the cross bar is fixedly connected to the connecting frame, and the sliding seat is fixedly mounted on the top of the connecting frame, and the sliding seat is slidably sleeved on the outer side of the slide rail, and the connecting column is fixedly mounted on the top of the rotating plate, and the connecting column movably abuts against the inner side of the connecting frame.

[0012] Preferably, the rotating drum is rotatably sleeved on the outside of the first air inlet pipe, the rotating ring is fixedly sleeved on the outside of the rotating drum, the first sliding frame and the second sliding frame are both slidably sleeved on the outside of the L frame, the two ends of the connecting rod are respectively hinged to the first sliding frame and the second sliding frame, and the abutment wheel is rotatably installed on the outside of the first sliding frame, the L frame, the first sliding frame, the second sliding frame, the connecting rod and the abutment wheel are all arranged in multiple groups, the L frame is fixedly installed on the outside of the rotating ring, and multiple L frames are distributed in a circular shape with equal intervals, an annular groove is opened on the inner side of the annular plate, and multiple abutment wheels are all abutted in the annular groove, the annular plate is fixedly installed in the connecting frame, the connecting spring is fixedly installed between the annular plate and the first rear partition plate, and a plurality of spiral sheets are integrally formed on the inner side of the rotating drum.

[0013] Preferably, the first rear baffle, the first rear baffle, the first front baffle and the first front baffle are all fixedly installed in the first sound-absorbing frame, the first air intake pipe passes through the first rear baffle, the first rear baffle and the first front baffle, the first air return pipe passes through the first rear baffle and the first front baffle, the first exhaust pipe passes through the first rear baffle, the first front baffle and the first front baffle, and a plurality of first fine holes are opened on the outer side of the first air intake pipe;

[0014] The second rear baffle, the second rear baffle, the second front baffle and the second front baffle are all fixedly installed in the second sound-absorbing frame, the second air intake pipe runs through the second rear baffle, the second rear baffle and the second front baffle, the second air return pipe runs through the second rear baffle and the second front baffle, the second exhaust pipe runs through the second rear baffle, the second front baffle and the second front baffle, and a plurality of second fine holes are opened on the outside of the second air intake pipe.

[0015] Preferably, two sealed doors are hingedly connected to the front side of the soundproof enclosure, and a closing mechanism is provided on the front side of the soundproof enclosure, wherein the closing mechanism comprises: a mounting shaft, a closing plate, a transverse plate, a locking frame, a fixed plate and a compression spring, wherein the compression spring is fixedly installed between the fixed plate and the locking frame, the fixed plate and the mounting shaft are fixedly installed on the front side of the soundproof enclosure, a guide rail is fixedly installed on one side of the fixed plate, the locking frame is slidably sleeved on the outer side of the guide rail, a locking groove is provided on one side of the locking frame, one end of the transverse plate is movably inserted into the locking groove, the other end of the transverse rod is fixedly connected to the closing plate, and the closing plate is rotatably sleeved on the outer side of the mounting shaft.

[0016] Preferably, pull plates are fixedly installed on both sides of the first sound-absorbing frame, the rear end of the pull plate is fixedly connected to the second sound-absorbing frame, the first sound-absorbing sheet is fixedly installed in the air inlet shell, the second sound-absorbing sheet is fixedly installed in the air exhaust shell, and the tail of the second sound-absorbing sheet is set to be curved.

[0017] The beneficial effects of the present invention are:

[0018] 1. In the present invention, the engine exhaust silencer is configured to start an axial flow fan to introduce outside air into the soundproof enclosure through the air intake housing, absorb the air intake noise through the first sound-absorbing sheet, and the gas exhausted from the engine contacts the embedded sound-absorbing plate and the sound-absorbing baffle in the soundproof enclosure to achieve the first absorption of the noise. At the same time, the noise is transmitted from the first sound-absorbing chamber to the second sound-absorbing chamber through the space at the bottom of the curved beam, thereby driving the two sides of the sound-absorbing baffle to vibrate. When the vibration frequencies of the air on both sides of the baffle are the same and the directions are opposite, they can cancel each other out, thereby reducing the noise generation. The vibration state of the sound-absorbing baffle is monitored by the acceleration sensor, and the signal is transmitted to the controller. When the sound absorption is detected, the controller generates a signal. When the vibration amplitude of the partition increases, the controller controls the drive motor to start, driving the rotating arm to rotate. The rotating arm drives the connecting frame and the sliding seat to move back and forth along the slide rail through the cooperation of the connecting frame and the cross bar. At the same time, the connecting frame drives the rotating arm to rotate back and forth around the fixed axis through the cooperation with the connecting column. During the rotation of the rotating plate, the sound waves will be blocked, and the direction of conduction will be changed, thereby adjusting the vibration effect on both sides of the sound-absorbing partition. When the vibration effects on both sides are largely offset, the actual vibration amplitude of the sound-absorbing partition is reduced. When the acceleration sensor detects that the vibration amplitude of the sound-absorbing partition is reduced to a lower state, the controller controls the drive motor to stop running, thereby improving the sound insulation effect by changing the angle of the rotating plate in real time.

[0019] 2. In the present invention, the engine exhaust silencer is configured such that the gas exhausted by the engine and the gas in the soundproof cover are discharged through the first sound absorbing frame and the exhaust shell. The gas entering the first sound absorbing frame first passes through the rotating drum and the first air intake pipe and enters between the first front baffle and the first front baffle. At this time, the vibration generated by the gas vibrates back and forth between the first front baffle and the first front baffle and cancels each other out. Then, the gas passes through the first air return pipe and enters between the first rear baffle and the first rear baffle. At this time, the vibration sound waves generated by the gas rebound back and forth between the first rear baffle and the first rear baffle and cancel each other out. Then, the gas is discharged into the exhaust shell through the first exhaust pipe and is absorbed by the second sound absorbing sheet. When the gas circulates in the first air intake pipe, the vibration sound waves can be transmitted to between the first front baffle and the first rear baffle through the first suction hole and act on the outside of the first air return pipe and the first exhaust pipe. At the same time, when the gas flows through the first air return pipe and the first exhaust pipe, the sound waves generated by its vibration act on the inside of the first air return pipe and the first exhaust pipe, thereby canceling each other out and improving the sound insulation effect.

[0020] 3. In the present invention, the engine exhaust silencer device, when the gas flows through the drum, can drive the drum to rotate by pushing the spiral sheet, and drives the L frame to rotate through the rotating ring, so that the second sliding frame moves away from each other under the action of centrifugal force, and drives the first sliding frame and the abutment wheel to move backward through the connecting rod, and the abutment wheel drives the annular plate and the connecting frame to move backward by abutting against the inner wall of the annular groove, and stretches the connecting spring. When the engine exhaust speed is large enough, the connecting frame is connected with the second sound-absorbing frame, so that the gas must first pass through the second sound-absorbing frame before entering the first sound-absorbing frame and then be discharged. When the gas flows through the second sound-absorbing frame, it can further achieve silencer with the cooperation of the second rear baffle, the second rear baffle, the second front baffle, the second front baffle, the second intake pipe, the second return pipe and the second exhaust pipe;

[0021] 4. In the present invention, the engine exhaust muffler device is configured such that by pulling the locking frame to release the fixation of the transverse plate, and then rotating the closing plate to disengage the closing plate from the sealing plate, the sealing door can be opened to facilitate inspection and maintenance of the interior of the soundproof enclosure.

[0022] 5. In the present invention, the engine exhaust silencer device can achieve multiple silencer effects of the engine exhaust through the cooperation of the air intake silencer, the exhaust silencer, the embedded sound absorbing panel, the sound absorbing baffle and the first silencer mechanism. The vibration state of the sound absorbing baffle can be monitored and adjusted in real time through the rotating arm and the swinging mechanism, so that the sound waves generated by the exhaust can be eliminated as much as possible. The switching mechanism and the second silencer mechanism can improve the silencer effect when the engine exhaust volume increases. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of an engine exhaust muffler device proposed by the present invention;

[0024] Figure 2 for Figure 1 A partial enlarged view of part A;

[0025] Figure 3 This is a partial cross-sectional structural diagram of an engine exhaust muffler device proposed by the present invention;

[0026] Figure 4 This is a schematic cross-sectional view of an engine exhaust muffler device proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the swing mechanism, rotating plate and sound-absorbing baffle proposed in the present invention;

[0028] Figure 6 for Figure 5 A partial enlarged view of part B;

[0029] Figure 7 This is a schematic cross-sectional view of the swing mechanism, rotating plate, and sound-absorbing baffle proposed in the present invention;

[0030] Figure 8 for Figure 7 A partial enlarged view of part C in the middle;

[0031] Figure 9 This is a schematic diagram of the three-dimensional structure of the switching mechanism proposed in the present invention;

[0032] Figure 10 A schematic diagram of the three-dimensional structure of the framework proposed in the present invention;

[0033] Figure 11 This is a schematic diagram of a partially exploded three-dimensional structure of the frame proposed in the present invention;

[0034] Figure 12 This is a schematic diagram of the three-dimensional structure of the air inlet muffler proposed by the present invention;

[0035] Figure 13 This is a schematic diagram of the three-dimensional structure of the exhaust muffler, the first muffler mechanism and the second muffler mechanism proposed in the present invention;

[0036] Figure 14 This is a schematic three-dimensional cross-sectional view of the exhaust muffler, the first muffler mechanism, and the second muffler mechanism proposed in the present invention;

[0037] Figure 15 This is a side sectional structural diagram of the exhaust muffler, the first muffler mechanism, the switching mechanism, and the second muffler mechanism proposed in the present invention;

[0038] Figure 16 for Figure 15 A partial enlarged view of the

[0039] Figure 17 This is a schematic diagram of the three-dimensional structure of the closing mechanism proposed in the present invention.

[0040] In the figure: 1. Soundproof enclosure; 101. Frame; 1011. Connecting beam; 1012. Longitudinal beam; 1013. Curved beam; 1014. Mounting plate; 1015. First reserved hole; 1016. Second reserved hole; 102. Embedded sound-absorbing panel; 2. Inlet muffler; 201. Inlet housing; 202. First sound-absorbing sheet; 203. Axial fan; 3. Exhaust muffler; 301. Exhaust housing; 302. Second sound-absorbing sheet. 4. First silencer; 401. First sound-absorbing frame; 402. First air inlet pipe; 403. First air return pipe; 404. First exhaust pipe; 405. First rear baffle; 406. First rear baffle; 407. First front baffle; 408. First front baffle; 5. Second silencer; 501. Second sound-absorbing frame; 502. Second air inlet pipe; 503. Second air return pipe; 504. Second exhaust pipe; 505. Second rear baffle ; 506, second rear baffle; 507, second front baffle; 508, second front partition; 6, closing mechanism; 601, mounting shaft; 602, closing plate; 603, horizontal plate; 604, locking frame; 605, guide rail; 606, compression spring; 607, fixing plate; 7, switching mechanism; 701, connecting frame; 702, annular plate; 703, connecting spring; 704, rotating drum; 705, abutting wheel; 706, first sliding frame ;707, connecting rod; 708, second sliding frame; 709, L frame; 710, rotating ring; 8, sound-absorbing baffle; 801, acceleration sensor; 9, rotating plate; 901, fixed axis; 10, engine; 11, controller; 12, drive motor; 13, rotating arm; 14, connecting frame; 15, cross bar; 16, connecting frame; 17, sliding seat; 18, slide rail; 19, connecting column; 20, pull plate; 21, sealing door. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Reference Figures 1-17 An engine exhaust muffler device includes: a soundproof enclosure 1, the soundproof enclosure 1 including a frame 101, an embedded sound-absorbing panel 102 and a sound-absorbing baffle 8 fixedly installed in the frame 101, the sound-absorbing baffle 8 dividing the soundproof enclosure 1 into a first sound-absorbing chamber and a second sound-absorbing chamber, an engine 10 is disposed in the first sound-absorbing chamber, the top of the first sound-absorbing chamber is connected to an axial flow fan 203, the top of the axial flow fan 203 is connected to an air intake muffler 2, the air intake muffler 2 includes an air intake shell 201 and a plurality of first sound-absorbing sheets 202, the front side of the first sound-absorbing chamber is connected to an exhaust muffler 3, the exhaust muffler 3 includes an exhaust shell 301 and a plurality of second sound-absorbing sheets 302;

[0043] The rear side of the exhaust housing 301 is provided with a first silencer mechanism 4 and a second silencer mechanism 5. The first silencer mechanism 4 includes: a first sound absorbing frame 401, a first rear baffle 405, a first rear baffle 406, a first front baffle 407, a first front baffle 408, a first air inlet pipe 402, a first air return pipe 403 and a first exhaust pipe 404; the second silencer mechanism 5 includes: a second sound absorbing frame 501, a second rear baffle 505, a second rear baffle 506, a second front baffle 507, a second front baffle 508, The second air intake duct 502, the second air return duct 503, and the second air exhaust duct 504 are provided with a switching mechanism 7 on the rear side of the first sound absorbing frame 401. The switching mechanism 7 includes: a connecting frame 701, an annular plate 702, a connecting spring 703, a rotating drum 704, a rotating ring 710, an L-shaped frame 709, a first sliding frame 706, a second sliding frame 708, a connecting rod 707, and an abutting wheel 705. The connecting frame 701 is slidably installed in the first sound absorbing frame 401 and is adapted to the second sound absorbing frame 501.

[0044] The frame 101 is internally rotatably installed with a rotating plate 9, the top of the rotating plate 9 is provided with a controller 11 and a swinging mechanism, acceleration sensors 801 are provided on both sides of the sound-absorbing partition 8, and the swinging mechanism includes: a driving motor 12, a rotating arm 13, a connecting frame 14, a cross bar 15, a connecting frame 16, a sliding seat 17, a slide rail 18 and a connecting column 19.

[0045] In this embodiment, the frame 101 includes: a longitudinal beam 1012, a connecting beam 1011 and a curved beam 1013. A mounting plate 1014 is fixedly installed on the outer side of the longitudinal beam 1012. The two ends of the connecting beam 1011 are fixedly connected to the corresponding mounting plates 1014. The two ends of the curved beam 1013 are fixedly connected to the corresponding connecting beam 1011. A fixed shaft 901 is fixedly installed on both sides of the curved beam 1013. The rotating plate 9 is rotatably sleeved on the outer side of the fixed shaft 901. A plurality of first reserved holes 1015 are provided on the mounting plate 1014. A plurality of second reserved holes 1016 are provided at both ends of the connecting beam 1011.

[0046] In this embodiment, the controller 11, the slide rail 18 and the drive motor 12 are all fixedly mounted on the bottom of the curved beam 1013, one end of the rotating arm 13 is fixedly mounted on the output shaft of the drive motor 12, and the other end of the rotating arm 13 is rotatably mounted on the top of the connecting frame 14, and the connecting frame 14 is slidably sleeved on the outer side of the cross bar 15, and one end of the cross bar 15 is fixedly connected to the connecting frame 16, and the sliding seat 17 is fixedly mounted on the top of the connecting frame 16, and the sliding seat 17 is slidably sleeved on the outer side of the slide rail 18, and the connecting column 19 is fixedly mounted on the top of the rotating plate 9, and the connecting column 19 is movably abutted against the inner side of the connecting frame 16.

[0047] In this embodiment, the rotating drum 704 is rotatably sleeved on the outside of the first air inlet pipe 402, the rotating ring 710 is fixedly sleeved on the outside of the rotating drum 704, the first sliding frame 706 and the second sliding frame 708 are both slidably sleeved on the outside of the L frame 709, the two ends of the connecting rod 707 are respectively hinged to the first sliding frame 706 and the second sliding frame 708, the abutting wheel 705 is rotatably installed on the outside of the first sliding frame 706, the L frame 709, the first sliding frame 706, the second sliding frame 708, the connecting rod 707 and the connecting rod 707 are respectively hinged to the first sliding frame 706 and the second sliding frame 708. The rods 707 and the abutment wheels 705 are arranged in multiple groups, the L-frame 709 is fixedly installed on the outside of the rotating ring 710, and multiple L-frames 709 are distributed in a circular shape with equal intervals. An annular groove is opened on the inner side of the annular plate 702, and multiple abutment wheels 705 are all abutted in the annular groove. The annular plate 702 is fixedly installed in the connecting frame 701, and the connecting spring 703 is fixedly installed between the annular plate 702 and the first rear partition 405. The inner side of the rotating drum 704 is integrally formed with multiple spiral sheets.

[0048] In this embodiment, the first rear baffle 405, the first rear baffle 406, the first front baffle 407, and the first front baffle 408 are all fixedly installed in the first sound-absorbing frame 401. The first air intake pipe 402 runs through the first rear baffle 405, the first rear baffle 406, and the first front baffle 407. The first air return pipe 403 runs through the first rear baffle 406 and the first front baffle 407. The first exhaust pipe 404 runs through the first rear baffle 406, the first front baffle 407, and the first front baffle 408. A plurality of first fine holes are opened on the outer side of the first air intake pipe 402.

[0049] The second rear baffle 505, the second rear baffle 506, the second front baffle 507 and the second front baffle 508 are all fixedly installed in the second sound-absorbing frame 501, the second air intake pipe 502 runs through the second rear baffle 505, the second rear baffle 506 and the second front baffle 507, the second air return pipe 503 runs through the second rear baffle 506 and the second front baffle 507, the second exhaust pipe 504 runs through the second rear baffle 506, the second front baffle 507 and the second front baffle 508, and a plurality of second fine holes are opened on the outside of the second air intake pipe 502.

[0050] In this embodiment, two sealed doors 21 are hingedly connected to the front side of the soundproof enclosure 1. A closing mechanism 6 is provided on the front side of the soundproof enclosure 1. The closing mechanism 6 includes: a mounting shaft 601, a closing plate 602, a transverse plate 603, a locking frame 604, a fixing plate 607 and a compression spring 606. The compression spring 606 is fixedly installed between the fixing plate 607 and the locking frame 604. The fixing plate 607 and the mounting shaft 601 are fixedly installed on the front side of the soundproof enclosure 1. A guide rail 605 is fixedly installed on one side of the fixing plate 607. The locking frame 604 is slidably sleeved on the outer side of the guide rail 605. A locking groove is provided on one side of the locking frame 604. One end of the transverse plate 603 is movably inserted into the locking groove. The other end of the cross bar 15 is fixedly connected to the closing plate 602. The closing plate 602 is rotatably sleeved on the outer side of the mounting shaft 601.

[0051] In this embodiment, pull plates 20 are fixedly installed on both sides of the first sound-absorbing frame 401, the rear end of the pull plate 20 is fixedly connected to the second sound-absorbing frame 501, the first sound-absorbing sheet 202 is fixedly installed on the air inlet shell 201, and the second sound-absorbing sheet 302 is fixedly installed in the air exhaust shell 301, and the tail of the second sound-absorbing sheet 302 is set to be curved.

[0052] In this embodiment, by starting the axial flow fan 203, the outside air is introduced into the sound insulation cover 1 through the air intake housing 201, and the air intake noise is absorbed by the first sound absorbing sheet 202. The gas exhausted from the engine 10 contacts the embedded sound absorbing plate 102 and the sound absorbing baffle 8 in the sound insulation cover 1, thereby achieving the first absorption of the noise. At the same time, the noise is transmitted from the first sound absorption chamber to the second sound absorption chamber through the space at the bottom of the curved beam 1013, thereby driving the two sides of the sound absorbing baffle 8 to vibrate. When the vibration frequencies caused by the air on both sides of the baffle are the same and in opposite directions, they can cancel each other out, thereby reducing the generation of noise. The vibration state of the sound absorbing baffle 8 is monitored by the acceleration sensor 801, and the signal is transmitted to the sensor. The signal is transmitted to the controller 11. When the vibration amplitude of the sound-absorbing baffle 8 is detected to increase, the controller 11 controls the drive motor 12 to start, driving the rotating arm 13 to rotate. The rotating arm 13 drives the connecting frame 16 and the sliding seat 17 to move back and forth along the slide rail 18 through the cooperation of the connecting frame 14 and the cross bar 15. At the same time, the connecting frame 16 drives the rotating arm 13 to rotate back and forth around the fixed axis 901 through the cooperation with the connecting column 19. During the rotation of the rotating plate 9, the sound waves will be blocked, the conduction direction will be changed, and the vibration effect on both sides of the sound-absorbing baffle 8 will be adjusted. When the vibration effects on both sides are largely offset, the actual vibration amplitude of the sound-absorbing baffle 8 is reduced. When the acceleration sensor 801 monitors When the vibration amplitude of the sound-absorbing baffle 8 is reduced to a lower state, the controller 11 controls the driving motor 12 to stop running, so that the noise reduction effect can be improved by changing the angle of the rotating plate 9 in real time. The gas exhausted by the engine 10 and the gas in the soundproof cover 1 are discharged through the first sound-absorbing frame 401 and the exhaust shell 301. The gas entering the first sound-absorbing frame 401 first passes through the rotating drum 704 and the first air inlet pipe 402 and enters between the first front baffle 408 and the first front baffle 407. At this time, the vibration generated by the gas vibrates back and forth between the first front baffle 408 and the first front baffle 407 and offsets each other. Then the gas enters the first rear baffle 406 and the first rear baffle 405 through the first return air pipe 403. At this time, the vibration sound waves generated by the gas bounce back and forth between the first rear baffle 406 and the first rear partition 405 and cancel each other out, and then are discharged into the exhaust housing 301 through the first exhaust pipe 404, and the noise is absorbed by the second sound-absorbing sheet. When the gas flows in the first air inlet pipe 402, the vibration sound waves can be transmitted to between the first front baffle 407 and the first rear baffle 406 through the first suction hole, and act on the outside of the first return air pipe 403 and the first exhaust pipe 404. At the same time, when the gas flows through the first return air pipe 403 and the first exhaust pipe 404, the sound waves generated by its vibration act on the inside of the first return air pipe 403 and the first exhaust pipe 404, so that they can cancel each other out, thereby improving the silencing effect;

[0053] When the gas flows through the drum 704, it can drive the drum 704 to rotate by pushing the spiral sheet, and drive the L frame 709 to rotate through the rotating ring 710, so that the second sliding frame 708 moves away from each other under the action of centrifugal force, and drives the first sliding frame 706 and the abutting wheel 705 to move backward through the connecting rod 707. The abutting wheel 705 drives the annular plate 702 and the connecting frame 701 to move backward by abutting against the inner wall of the annular groove, and stretches the connecting spring 703. When the exhaust speed of the engine 10 is large enough, the connecting frame 701 is connected to the second sound absorbing frame 501, so that the gas must first pass through the second sound absorbing frame 501 before entering the first sound absorbing frame 401 and then be discharged. When the gas flows through the second sound absorbing frame 501, it can further achieve noise reduction with the cooperation of the second rear baffle 505, the second rear baffle 506, the second front baffle 507, the second front baffle 508, the second intake pipe 502, the second return pipe 503 and the second exhaust pipe 504;

[0054] By pulling the locking frame 604 to release the fixation of the horizontal plate 603, and then rotating the closing plate 602 to disengage the closing plate 602 from the sealing plate, the sealing door 21 can be opened to facilitate inspection and maintenance of the interior of the soundproof enclosure 1.

[0055] The above is a detailed introduction to the engine exhaust muffler device provided by the present invention. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that, for those skilled in the art, various improvements and modifications may be made to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An engine exhaust muffler, characterized in that: include: A soundproof enclosure (1), the soundproof enclosure (1) comprising a frame (101), an embedded sound-absorbing plate (102) and a sound-absorbing baffle (8) fixedly mounted in the frame (101), the sound-absorbing baffle (8) dividing the soundproof enclosure (1) into a first sound-absorbing chamber and a second sound-absorbing chamber, an engine (10) being arranged in the first sound-absorbing chamber, the top of the first sound-absorbing chamber being connected to an axial flow fan (203), the top of the axial flow fan (203) being connected to an air intake muffler (2), the air intake muffler (2) comprising an air intake shell (201) and a plurality of first sound-absorbing sheets (202), the front side of the first sound-absorbing chamber being connected to an exhaust muffler (3), the exhaust muffler (3) comprising an exhaust shell (301) and a plurality of second sound-absorbing sheets (302), the rear side of the exhaust shell (301) being provided with a first muffler mechanism (4) and a second muffler mechanism (5); A rotating plate (9) is rotatably mounted inside the frame (101), a controller (11) and a swing mechanism are provided on the top of the rotating plate (9), acceleration sensors (801) are provided on both sides of the sound-absorbing baffle (8), and the swing mechanism includes: a driving motor (12), a rotating arm (13), a connecting frame (14), a crossbar (15), a connecting frame (16), a sliding seat (17), a slide rail (18) and a connecting column (19).

2. The engine exhaust muffler device according to claim 1, characterized in that: The first sound-absorbing mechanism (4) comprises: a first sound-absorbing frame (401), a first rear baffle (405), a first rear baffle (406), a first front baffle (407), a first front baffle (408), a first air intake pipe (402), a first air return pipe (403) and a first exhaust pipe (404); the second sound-absorbing mechanism (5) comprises: a second sound-absorbing frame (501), a second rear baffle (505), a second rear baffle (506), a second front baffle (507), a second front baffle (508), a second air intake pipe (502), a second air return pipe (503) and a first exhaust pipe (404); A second exhaust pipe (504) is provided, and a switching mechanism (7) is provided on the rear side of the first sound-absorbing frame (401). The switching mechanism (7) comprises: a connecting frame (701), an annular plate (702), a connecting spring (703), a rotating drum (704), a rotating ring (710), an L-frame (709), a first sliding frame (706), a second sliding frame (708), a connecting rod (707) and an abutting wheel (705). The connecting frame (701) is slidably installed in the first sound-absorbing frame (401), and the connecting frame (701) is adapted to the second sound-absorbing frame (501).

3. The engine exhaust muffler device according to claim 1, characterized in that: The frame (101) comprises: a longitudinal beam (1012), a connecting beam (1011) and a curved beam (1013); a mounting plate (1014) is fixedly mounted on the outer side of the longitudinal beam (1012); two ends of the connecting beam (1011) are fixedly connected to the corresponding mounting plates (1014); two ends of the curved beam (1013) are fixedly connected to the corresponding connecting beam (1011); a fixed shaft (901) is fixedly mounted on both sides of the curved beam (1013); the rotating plate (9) is rotatably sleeved on the outer side of the fixed shaft (901); a plurality of first reserved holes (1015) are provided on the mounting plate (1014); and a plurality of second reserved holes (1016) are provided on both ends of the connecting beam (1011).

4. The engine exhaust muffler device according to claim 1, characterized in that: The controller (11), the slide rail (18) and the drive motor (12) are all fixedly mounted on the bottom of the curved beam (1013); one end of the rotating arm (13) is fixedly mounted on the output shaft of the drive motor (12); the other end of the rotating arm (13) is rotatably mounted on the top of the connecting frame (14); the connecting frame (14) is slidably sleeved on the outside of the cross bar (15); one end of the cross bar (15) is fixedly connected to the connecting frame (16); the sliding seat (17) is fixedly mounted on the top of the connecting frame (16); the sliding seat (17) is slidably sleeved on the outside of the slide rail (18); the connecting column (19) is fixedly mounted on the top of the rotating plate (9), and the connecting column (19) is movably abutted against the inner side of the connecting frame (16).

5. The engine exhaust muffler device according to claim 2, characterized in that: The rotating drum (704) is rotatably sleeved on the outside of the first air inlet pipe (402), the rotating ring (710) is fixedly sleeved on the outside of the rotating drum (704), the first sliding frame (706) and the second sliding frame (708) are both slidably sleeved on the outside of the L frame (709), the two ends of the connecting rod (707) are respectively hinged to the first sliding frame (706) and the second sliding frame (708), the abutting wheel (705) is rotatably installed on the outside of the first sliding frame (706), the L frame (709), the first sliding frame (706), the second sliding frame (708), the connecting rod (707) and the connecting rod (707) are respectively hinged to the first sliding frame (706) and the second sliding frame (708). The connecting rod (707) and the abutment wheel (705) are both arranged in multiple groups. The L-frame (709) is fixedly mounted on the outside of the rotating ring (710). The multiple L-frames (709) are distributed in a circular shape with equal intervals. An annular groove is provided on the inner side of the annular plate (702). The multiple abutment wheels (705) are all abutted in the annular groove. The annular plate (702) is fixedly mounted in the connecting frame (701). The connecting spring (703) is fixedly mounted between the annular plate (702) and the first rear partition plate (405). The inner side of the rotating drum (704) is integrally formed with multiple spiral sheets.

6. The engine exhaust muffler device according to claim 1, characterized in that: Two sealing doors (21) are hinged on the front side of the soundproof enclosure (1), and a closing mechanism (6) is provided on the front side of the soundproof enclosure (1).

7. The engine exhaust muffler device according to claim 2, characterized in that: Pull plates (20) are fixedly mounted on both sides of the first sound-absorbing frame (401), and the rear end of the pull plate (20) is fixedly connected to the second sound-absorbing frame (501). The first sound-absorbing sheet (202) is fixedly mounted on the air inlet housing (201), and the second sound-absorbing sheet (302) is fixedly mounted in the air outlet housing (301). The rear end of the second sound-absorbing sheet (302) is arranged to be curved.

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