CN215633247U - Silencer with improved structure - Google Patents

Abstract

The embodiment of the utility model belongs to the technical field of silencers, and particularly relates to a silencer. The embodiment of the utility model aims to solve the problem of large mass of the silencer in the related art. The silencer comprises a box body, wherein a first partition plate is arranged in the box body, the box body is divided into a first cavity communicated with an engine and a second cavity communicated with the outside atmosphere by the first partition plate, and a fire extinguishing layer is arranged on the side wall of the second cavity; be provided with the water conservancy diversion hole of intercommunication first cavity and second cavity on the first baffle, the edge in water conservancy diversion hole is provided with the guide plate of slope, and the guide plate is used for leading by the waste gas of water conservancy diversion hole outflow to make waste gas flow to the fire extinguishing layer. According to the fire extinguishing star silencer provided by the embodiment of the utility model, the guide plate can guide waste gas without surrounding the guide hole, and compared with silencers in the related art, the mass of the first partition plate is reduced, so that the mass of the silencer is reduced.

Description

Silencer with improved structure

Technical Field

The embodiment of the utility model belongs to the technical field of silencers, and particularly relates to a silencer.

Background

The fields such as ships, ocean platforms, oil fields and the like generally have higher requirements on the discharge of mars. Therefore, for the engine used on such a site, it is necessary to equip a muffler with a spark extinguishing function to extinguish sparks in exhaust gas.

In the related art, the muffler generally includes a case. The first partition plate is arranged in the box body in parallel and at intervals, the first partition plate divides the interior of the box body into a first cavity and a second cavity, the first cavity is communicated with an exhaust port of an engine, and the second cavity is communicated with the outside atmosphere. A fire extinguishing layer is arranged on the side wall of the second cavity, a flow guide hole is formed in the first partition plate, a flow guide pipe is welded on the first partition plate, and the flow guide pipe is located in the middle cavity and communicated with the flow guide hole; the draft tube is obliquely arranged relative to the first partition plate so as to guide the waste gas from the first cavity to the fire extinguishing layer to eliminate sparks in the waste gas.

However, the guide pipe communicated with the guide hole is welded on the first partition plate to guide the waste gas, so that the first partition plate has large mass and the silencer has large mass.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention provides a fire extinguishing star silencer to solve the technical problem of large mass of the silencer.

The embodiment of the utility model provides a fire extinguishing star silencer, which comprises a box body, wherein a first partition plate is arranged in the box body, the box body is divided into a first cavity and a second cavity by the first partition plate, the first cavity is used for being communicated with an engine, the second cavity is used for being communicated with the outside atmosphere, and a fire extinguishing layer is arranged on the side wall, adjacent to the first partition plate, in the second cavity; be provided with the water conservancy diversion hole of first cavity of intercommunication and second cavity on the first baffle, first baffle is provided with the guide plate on the side of second cavity, and the edge that is located the water conservancy diversion hole, and the guide plate sets up for first baffle slope, and the guide plate is used for leading by the waste gas of water conservancy diversion hole outflow to make waste gas flow to the fire extinguishing layer.

According to the silencer provided by the embodiment of the utility model, the first partition plate between the first cavity and the second cavity is provided with the flow guide hole, the side surface of the first partition plate facing the second cavity is provided with the flow guide plate, the flow guide plate is arranged at the edge of the flow guide hole, and the flow guide plate is obliquely arranged relative to the first partition plate. Waste gas in the first cavity flows through the water conservancy diversion hole, and the guide plate leads to the waste gas that flows by the water conservancy diversion hole to make the waste gas flow direction be located the fire extinguishing layer on the lateral wall of second cavity, the spark in the waste gas contacts with the fire extinguishing layer, thereby extinguishes the spark. The guide plate is arranged at the edge of the guide hole, the guide plate can guide the waste gas without surrounding the guide hole, and compared with the silencer in the related art, the guide plate has the advantages that the area of the guide plate is small, the mass of the first partition plate is reduced, and therefore the mass of the silencer is reduced.

In some embodiments, which may include the above embodiments, the first partition plate is a circular plate, the plurality of diversion holes are distributed around the center of the first partition plate at equal central angles; the edge of each flow guide hole is provided with a flow guide plate, and the included angles between the flow guide plates and the first partition plate are equal; in the adjacent diversion holes, the diversion plate corresponding to the previous diversion hole is positioned on one side of the diversion hole far away from the next diversion hole.

So set up, first baffle is the plectane, and a plurality of water conservancy diversion holes encircle the distribution of the central equal central angle of first baffle, and the guide plate sets up in same one side in every water conservancy diversion hole, and the guide plate equals with the contained angle of first baffle for waste gas in the first cavity evenly flows from a plurality of water conservancy diversion holes, with the area of contact on increase waste gas and the fire extinguishing layer on the second cavity lateral wall, improves the mars and extinguishes the effect.

In some embodiments, which may include the above embodiments, the widths of the baffle holes and the baffle plate are gradually increased from the center of the first partition plate to the edge of the first partition plate.

So set up, can increase the flow area in water conservancy diversion hole, reduce the resistance that first baffle produced waste gas to reduce the backpressure of muffler, prevent that the engine from taking place the not smooth problem of exhaust.

In some embodiments, which may include the above embodiments, the baffle is a unitary structure with the first baffle.

So set up, can reduce the processing degree of difficulty of guide plate, and can improve the convenience of first baffle installation and debugging.

In some embodiments, which may include the above embodiments, the angle between the baffle and the first baffle is 45 ° to 60 °.

In some embodiments, which may include the above embodiments, the muffler further includes a plurality of intake pipes, each intake pipe having one end for communicating with one exhaust port of the engine; the other end of each air inlet pipe is connected with the box body and communicated with the first cavity.

According to the silencer, the flow area of waste gas can be increased, resistance to the waste gas is reduced, accordingly, exhaust back pressure of the silencer is reduced, and the problem that the engine is unsmooth in exhaust is solved.

In some embodiments, which may include the above embodiments, a second partition is disposed within the first chamber, the second partition being disposed parallel to and spaced apart from the first partition, the second partition dividing the first chamber into a first expansion chamber and a diversion chamber, the diversion chamber being disposed proximate to the first partition; the air inlet pipe comprises a first section positioned in the first expansion cavity and a second section positioned outside the box body, the second section is used for being communicated with an air outlet of the engine, and a plurality of first holes are formed in the side wall of the first section; the second partition plate is provided with a first communicating hole, and one end of the first section, which is far away from the second section, is communicated with the first communicating hole.

According to the arrangement, the exhaust gas enters the second section of the air inlet pipe from the exhaust port of the engine, then enters the first section of the air inlet pipe, and enters the first expansion cavity through the plurality of first holes arranged on the first section, so that the noise of exhaust gas emission is reduced; then, the waste gas in the first expansion cavity enters the first section of the air inlet pipe through the first holes and enters the flow guide cavity through the first communication holes.

In some embodiments, which may include the above embodiments, the plurality of first holes are uniformly arranged along a circumferential direction of the intake pipe.

So set up, a plurality of first holes evenly set up along the circumference of intake pipe for waste gas can evenly flow into first inflation intracavity through a plurality of first holes, thereby reduces the resistance that the intake pipe produced waste gas, thereby reduces the exhaust backpressure of muffler.

In some embodiments, which may include the above embodiments, the muffler further includes an exhaust pipe disposed on the box body, one end of the exhaust pipe is communicated with the second cavity, and the other end of the exhaust pipe is used for communicating with the outside atmosphere.

So set up, the waste gas in the second cavity passes through the blast pipe and discharges to the external world, discharges waste gas from the muffler in to realize the exhaust emission of engine.

In some embodiments, which may include the above embodiments, a third partition is disposed within the second chamber, the third partition being disposed parallel to the first partition, the third partition dividing the second chamber into a fire extinguishing chamber and a second expansion chamber, the fire extinguishing chamber being disposed adjacent to the first partition, the fire extinguishing layer being disposed on a side wall of the fire extinguishing chamber adjacent to the first partition; the exhaust pipe comprises a third section and a fourth section, the third section is positioned in the second expansion cavity, the fourth section is positioned outside the box body, and a plurality of second holes are formed in the side wall of the third section; and a second communicating hole is formed in the third partition plate, and one end, far away from the fourth section, of the third section is communicated with the second communicating hole.

With the arrangement, after the sparks in the waste gas are extinguished by the fire extinguishing layer on the side wall of the fire extinguishing chamber, the waste gas enters the third section of the exhaust pipe through the second communication hole and enters the second expansion chamber through the second hole on the third section, so that the noise of the waste gas emission is further reduced; then, the exhaust gas in the second expansion cavity enters the fourth section of the exhaust pipe through the second hole and is exhausted to the outside atmosphere.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is easy to see that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a muffler of the related art;

fig. 2 is a schematic structural diagram of a silencer provided in this embodiment;

FIG. 3 is a schematic cross-sectional view of the muffler of FIG. 2;

FIG. 4 is a sectional view taken along line A-A of the muffler of FIG. 3;

fig. 5 is a schematic structural view of the first separator in fig. 2.

Description of reference numerals:

100-a silencer;

10-a box body;

11-a first separator;

111-flow guide holes;

112-a baffle;

12-a first cavity;

121-a second separator;

122-a first expansion chamber;

123-a flow guide cavity;

124-first via hole;

13-a second cavity;

131-a third separator;

132-a fire extinguishing chamber;

133-a second expansion chamber;

134-second communication hole;

135-fire extinguishing layer;

20-an air inlet pipe;

21-first stage;

211-a first hole;

22-a second section;

30-an exhaust pipe;

31-third section;

311-a second hole;

32-fourth section;

200-related art silencers;

300-manifold.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An engine is a machine capable of converting various forms of energy into mechanical energy, and is generally used as a power source for various vehicles and other mechanical equipment. The engine generally includes a cylinder block, a cylinder head and a piston, the piston is slidably connected in the cylinder block, the cylinder head is hermetically connected with the cylinder block to form a combustion chamber, and an oil inlet, an air inlet and an air outlet communicated to the combustion chamber are formed in the cylinder head. The fuel enters the combustion chamber through the oil inlet, external fresh air enters the combustion chamber through the air inlet and is mixed with the fuel, the fuel and the gas are combusted in ignition or compression ignition modes and the like to generate power, and therefore the piston is pushed to act to achieve power output. Exhaust gases formed after combustion are discharged through an exhaust port, and sparks are usually carried in the exhaust gases.

However, sites such as ships, offshore platforms, oil fields, etc. often have high requirements for the emission of sparks in exhaust gases. Therefore, it is necessary to provide a muffler having a spark extinguishing function for an engine used in such a site, and to connect an exhaust port of the engine to the muffler to discharge exhaust gas through the muffler, thereby reducing noise and extinguishing sparks in the exhaust gas.

In order to increase the power of the engine, the number of cylinder blocks in the engine may be plural, and the plural cylinder blocks are arranged in some manner, such as an in-line engine and a V-type engine. In the inline engine, a plurality of cylinder blocks are arranged in a straight line, a cylinder head is provided with an air inlet and an air outlet, and the plurality of cylinder blocks share the air inlet and the air outlet. The V-type engine divides the cylinder block into two rows, and accordingly, two intake ports and two exhaust ports are provided in the cylinder head, and each row of the cylinder block shares one intake port and one exhaust port. Referring to fig. 1, when a muffler is connected to a V-type engine, two exhaust ports of the V-type engine are generally connected to a manifold 300, and exhaust gas discharged through the two exhaust ports is collected by the manifold 300 and then enters the muffler 200 of the related art.

The related art muffler 200 generally includes a case. Be provided with first baffle in the box body, first baffle is with box body internal partitioning become with the first cavity of the gas vent intercommunication of engine and with the second cavity of external atmosphere intercommunication. And a fire extinguishing layer is arranged on the side wall of the second cavity. Be provided with the water conservancy diversion hole on the first baffle, still weld the honeycomb duct on the first baffle, the honeycomb duct is located middle intracavity and communicates with the water conservancy diversion hole, and the honeycomb duct sets up for first baffle slope. In all got into the honeycomb duct by the waste gas of water conservancy diversion hole outflow, the honeycomb duct led intraductal waste gas, made waste gas flow direction fire extinguishing layer guide, the spark in the waste gas contacts with the layer of putting out a fire to eliminate the spark in the waste gas. However, in the related art, when the exhaust gas is guided, the flow guide pipe needs to be covered on the flow guide hole, that is, the side wall of the flow guide pipe needs to surround the flow guide hole, so that the diameter of the flow guide pipe is large, the mass of the flow guide pipe is large, and the mass of the first partition plate is large, so that the mass of the silencer is large.

The muffler of this embodiment through set up the guide plate that inclines mutually with first baffle at water conservancy diversion hole edge, contacts by the waste gas and the guide plate that the water conservancy diversion hole flows, and the guide plate plays the effect of direction to waste gas for waste gas flows to the flame-out layer on the second cavity lateral wall, extinguishes the spark in the waste gas. In this embodiment, the guide plate need not to realize the direction to waste gas around the water conservancy diversion hole, compares with the muffler among the correlation technique, and the guide plate area is little, has reduced the quality of first space bar to the quality of muffler has been reduced.

Referring to fig. 2, the muffler 100 of the present embodiment includes a case 10, an intake duct 20, and an exhaust duct 30. The case 10 is hollow inside. One end of the air inlet pipe 20 is disposed on one end surface of the case 10. The other end of the intake pipe 20 is adapted to communicate with an exhaust port of the engine, for example, via a pipe having an expansion joint at one end. One end of the exhaust pipe 30 is provided on the other end surface of the case 10. The other end of the exhaust pipe 30 is connected to the outside atmosphere, for example, via an extension line. The exhaust gas discharged from the exhaust port of the engine enters the case body 10 through the intake duct 20, the case body 10 muffles the exhaust gas and extinguishes sparks in the exhaust gas, and then the exhaust gas is discharged into the outside atmosphere through the exhaust duct 30.

In the present embodiment, the number of the intake pipes 20 is plural, one end of each intake pipe 20 communicates with one exhaust port of the engine, and the other end of each intake pipe 20 is connected to the case 10. That is, the number of intake pipes 20 is the same as the number of exhaust ports of the engine, one intake pipe 20 for each exhaust port of the engine. In waste gas gets into box body 10 through an intake pipe 20 after every gas vent from the engine is discharged, with among the relevant art with waste gas from every gas vent of engine discharge earlier through the manifold 300 after gathering, compare in rethread intake pipe 20 lets in box body 10, the muffler 100 of this embodiment can increase the flow area of waste gas, reduces the resistance to waste gas to reduce the exhaust backpressure of muffler 100, prevent that the engine from taking place the not smooth problem of exhaust.

The box body 10 is used for silencing waste gas and extinguishing sparks in the waste gas. Referring to fig. 3, a first partition 11 is provided in the cartridge body 10, and the first partition 11 divides the cartridge body 10 into a first cavity 12 and a second cavity 13. The first chamber 12 communicates with an exhaust port of the engine through an intake duct 20, and the second chamber 13 communicates with the outside atmosphere through an exhaust duct 30. A fire extinguishing layer 135 is arranged on the side wall of the second cavity 13 adjacent to the first partition plate 11, and the fire extinguishing layer 135 is used for extinguishing sparks in the tail gas. The fire extinguishing layer 135 may be fire extinguishing cotton, and for example, the material of the fire extinguishing cotton may be stainless steel, etc. The first partition 11 is provided with a flow guide hole 111 communicating the first cavity 12 and the second cavity 13. The first partition board 11 faces the side of the second chamber 13, and a guide plate 112 is disposed at the edge of the guide hole 111, the guide plate 112 is disposed in an inclined manner with respect to the first partition board 11, and the guide plate 112 is used for guiding the exhaust gas flowing out from the guide hole 111 so that the exhaust gas flows toward the fire extinguishing layer 135. The angle between the baffle 112 and the first baffle 11 may be 45 ° to 60 °, for example 45 °, 50 ° or 60 °.

The silencer 100 of this embodiment, the exhaust gas that is discharged by the gas vent of engine gets into first cavity 12 through intake pipe 20, and the exhaust gas in first cavity 12 flows out through water conservancy diversion hole 111, and guide plate 112 is to the exhaust gas by water conservancy diversion hole 111 outflow to make the exhaust gas flow direction be located the flame-out layer 135 on the lateral wall of second cavity 13, the spark in the exhaust gas and the contact of flame-out layer 135, thereby extinguish the spark. In this embodiment, the guide plate 112 is disposed at the edge of the guide hole 111, and the guide plate 112 can guide the exhaust gas without surrounding the guide hole 111, and compared with the muffler 200 of the related art, the guide plate 112 has a small area, and reduces the mass of the first partition plate 11, thereby reducing the mass of the muffler 100.

The first partition 11 is located in the case 10, the shape of the first partition 11 may be the same as the shape of the cross section of the inside of the case 10, and the first partition 11 is installed in the case 10. Referring to fig. 4 and 5, the first barrier 11 may be a circular plate, the plurality of guide holes 111 may be provided, and the plurality of guide holes 111 may be distributed around the center of the first barrier 11 at an equal central angle. That is, the plurality of guide holes 111 are uniformly arranged in the circumferential direction of the first barrier 11. A guide plate 112 is arranged at the edge of each guide hole 111, and the included angle between each guide plate 112 and the first partition plate 11 is equal. In the adjacent flow guide holes 111, the flow guide plate 112 corresponding to the previous flow guide hole 111 is located on one side of the flow guide hole 111 far away from the next flow guide hole 111. That is, the diversion plate 112 is disposed on the same side of each diversion hole 111. So set up for the waste gas that gets into in the first cavity 12 can follow a plurality of water conservancy diversion holes 111 and evenly flow out, with the area of contact of the layer 135 that goes out a fire on increase waste gas and the second cavity 13 lateral wall, improve the effect of going out of mars.

In some other embodiments of this embodiment, the widths of the diversion holes 111 and the diversion plate 112 are gradually increased from the center of the first partition plate 11 to the edge of the first partition plate 11, so as to increase the flow area of the diversion holes 111 and reduce the resistance of the first partition plate 11 to the exhaust gas, thereby reducing the back pressure of the muffler 100 and preventing the engine from suffering from unsmooth exhaust.

The baffle 112 and the first partition 11 may be separate structures, and the baffle 112 is connected to the first partition 11 by a connector such as a bolt. The baffle 112 and the first baffle 11 may also be of unitary construction, such as by welding, casting, or integral stamping. The integrated structure can reduce the processing difficulty of the guide plate 112 and improve the convenience of assembling and adjusting the first partition plate 11.

Referring to fig. 2 and 3, in the present embodiment, one end of each intake pipe 20 communicates with one exhaust port of the engine, and the other end of each intake pipe 20 is connected to the case 10 and communicates with the first chamber 12. Each exhaust port of the engine communicates with the first chamber 12 via an inlet line 20.

A second partition board 121 is arranged in the first cavity 12, the second partition board 121 is parallel to and spaced from the first partition board 11, the second partition board 121 divides the first cavity 12 into a first expansion cavity 122 and a diversion cavity 123, and the diversion cavity 123 is arranged close to the first partition board 11. The air inlet conduit 20 comprises a first section 21 located inside the first expansion chamber 122 and a second section 22 located outside the enclosure 10. The second section 22 is adapted to communicate with an exhaust port of the engine, for example, via a conduit having an expansion joint at one end. A plurality of first holes 211 are formed in a sidewall of the first section 21. The second partition 121 is provided with a first communicating hole 124, and one end of the first section 21 away from the second section 22 is communicated with the first communicating hole 124.

The exhaust gas enters the second section 22 of the intake pipe 20 from the exhaust port of the engine, then enters the first section 21 of the intake pipe 20, and enters the first expansion chamber 122 via the plurality of first holes 211 arranged on the first section 21, so as to reduce the noise of the exhaust gas emission. Then, the exhaust gas in the first expansion chamber 122 enters the first section 21 of the air inlet 20 through the first holes 211 and enters the diversion chamber 123 through the first communication hole 124.

In some other embodiments of the present embodiment, the plurality of first holes 211 are uniformly arranged along the circumferential direction of the intake pipe 20, so that the exhaust gas can uniformly flow into the first expansion cavity 122 through the plurality of first holes 211, thereby reducing the resistance of the intake pipe 20 to the exhaust gas, and further reducing the exhaust back pressure of the muffler 100 to prevent the problem of poor exhaust of the engine.

Referring to fig. 2 and 3, an exhaust duct 30 is provided on the case 10, one end of the exhaust duct 30 communicating with the second chamber 13, and the other end of the exhaust duct 30 for communicating with the external atmosphere. The exhaust gas in the second chamber 13 is discharged to the outside through the exhaust pipe 30, and the exhaust gas is discharged from the muffler 100, thereby implementing exhaust emission of the engine.

Be provided with third baffle 131 in the second cavity 13, third baffle 131 and first baffle 11 parallel arrangement, and fire extinguishing chamber 132 and second inflation chamber 133 are separated into with second cavity 13 to third baffle 131, and fire extinguishing chamber 132 is close to first baffle 11 and sets up, and fire extinguishing layer 135 sets up on the lateral wall that borders on with first baffle 11 in fire extinguishing chamber 132. The exhaust pipe 30 includes a third section 31 located in the second expansion chamber 133 and a fourth section 32 located outside the box body 10, and a plurality of second holes 311 are formed in a sidewall of the third section 31. The third partition 131 is provided with a second communication hole 134, and one end of the third segment 31 away from the fourth segment 32 is communicated with the second communication hole 134.

The exhaust gas in the first expansion chamber 122 flows out through the guiding holes 111, and the guiding plate 112 guides the exhaust gas to flow to the fire extinguishing layer 135 on the side wall of the fire extinguishing chamber 132. After the sparks in the exhaust gas are extinguished by the extinguishing layer 135, the exhaust gas enters the third section 31 of the exhaust pipe 30 through the second communication hole 134 and enters the second expansion chamber 133 through the second hole 311 on the third section 31, so as to further reduce the noise of the exhaust gas. Then, the exhaust gas in the second expansion chamber 133 enters the fourth section 32 of the exhaust pipe 30 through the second hole 311 and is discharged to the outside atmosphere.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A silencer is characterized by comprising a box body, wherein a first partition plate is arranged in the box body and divides the box body into a first cavity and a second cavity, the first cavity is used for being communicated with an engine, the second cavity is used for being communicated with the outside atmosphere, and a fire extinguishing layer is arranged on the side wall, adjacent to the first partition plate, in the second cavity;

the first baffle is provided with the intercommunication first cavity with the water conservancy diversion hole of second cavity, first baffle orientation on the side of second cavity, and be located the edge in water conservancy diversion hole is provided with the guide plate, the guide plate for first baffle slope sets up, the guide plate be used for to by the waste gas that the water conservancy diversion hole flows leads to, so that waste gas to the layer of putting out a fire flows.

2. The muffler of claim 1, wherein the first partition is a circular plate, the plurality of flow guide holes are distributed around a center of the first partition at an equal central angle; the edge of each flow guide hole is provided with one flow guide plate, and the included angle between each flow guide plate and the first partition plate is equal;

and in the adjacent diversion holes, the diversion plate corresponding to the previous diversion hole is positioned on one side of the diversion hole far away from the next diversion hole.

3. The muffler of claim 2, wherein the width of each of the baffle holes and the baffle plate is gradually increased from the center of the first partition plate toward the edge of the first partition plate.

4. The muffler of claim 1, wherein the baffle is of unitary construction with the first baffle.

5. The muffler of claim 1, wherein the angle between the baffle and the first baffle is 45 ° to 60 °.

6. The muffler of any one of claims 1-5, further comprising a plurality of intake pipes, each of the intake pipes having one end for communicating with an exhaust port of an engine; the other end of each air inlet pipe is connected with the box body and communicated with the first cavity.

7. The muffler of claim 6 wherein a second baffle is disposed within the first chamber, the second baffle disposed parallel to and spaced from the first baffle, the second baffle dividing the first chamber into a first expansion chamber and a diversion chamber, the diversion chamber disposed adjacent the first baffle;

the air inlet pipe comprises a first section positioned in the first expansion cavity and a second section positioned outside the box body, the second section is used for being communicated with an exhaust port of an engine, and a plurality of first holes are formed in the side wall of the first section; the second partition plate is provided with a first communicating hole, and one end, far away from the second section, of the first section is communicated with the first communicating hole.

8. The muffler of claim 7, wherein the first holes are uniformly arranged in a circumferential direction of the intake pipe.

9. The muffler of any one of claims 1-5, further comprising an exhaust pipe disposed on the box body, one end of the exhaust pipe being in communication with the second cavity, and the other end of the exhaust pipe being adapted to be in communication with the outside atmosphere.

10. The muffler of claim 9, wherein a third baffle is disposed within the second chamber, the third baffle being disposed parallel to the first baffle, the third baffle separating the second chamber into a fire extinguishing chamber disposed proximate to the first baffle and a second expansion chamber, the fire extinguishing layer being disposed on a sidewall of the fire extinguishing chamber adjacent to the first baffle;

the exhaust pipe comprises a third section and a fourth section, the third section is positioned in the second expansion cavity, the fourth section is positioned outside the box body, and a plurality of second holes are formed in the side wall of the third section; and a second communicating hole is formed in the third partition plate, and one end, far away from the fourth section, of the third section is communicated with the second communicating hole.

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