Silencer for sleigh car

Abstract

The utility model belongs to the technical field of silencers, and relates to a silencer for a sleigh car, which comprises a shell assembly, the shell assembly comprises an inner shell and an outer shell, and a glass fiber heat insulation layer is filled between the inner shell and the outer shell; the left side and the right side outside the shell assembly are wrapped with a left glass fiber heat insulation layer and a right glass fiber heat insulation layer respectively, the end face of the left glass fiber heat insulation layer abuts against the end face of the right glass fiber heat insulation layer to form an annular structure, and the left glass fiber heat insulation layer is covered with a left heat insulation cover for fixing the left glass fiber heat insulation layer. A right heat insulation cover for fixing the right glass fiber heat insulation layer is arranged outside the right glass fiber heat insulation layer in a covering mode, and the left heat insulation cover and the right heat insulation cover are fixedly connected through a hemming structure. The silencer for the sleigh car has the advantages of being simple in structure and good in heat insulation effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of mufflers and relates to a muffler for a sled vehicle. Background Art

[0002] As a new snow transportation and entertainment tool, sleds are becoming more and more popular. At present, medium and large displacement sleds mainly use two-stroke engines, which are noisy. In order to reduce noise and emissions, special mufflers are needed.

[0003] However, due to the gradual improvement of emission requirements, more and more snowmobiles use four-stroke engines, and the emission temperature of four-stroke engines is relatively high, especially the temperature difference with the snowmobile operating environment is very large, and the existing mufflers can no longer meet their performance requirements. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a muffler for a sled vehicle, which has the advantages of simple structure and good heat insulation effect.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A muffler for a sled comprises a shell assembly, wherein the shell assembly comprises an inner shell and an outer shell, wherein a glass fiber insulation layer is filled between the inner shell and the outer shell; a left glass fiber insulation layer and a right glass fiber insulation layer are respectively wrapped on the left and right sides outside the shell assembly, wherein the end surfaces of the left glass fiber insulation layer and the right glass fiber insulation layer are in conflict with each other and form an annular structure, wherein the outer cover of the left glass fiber insulation layer is provided with a left insulation cover for fixing the left glass fiber insulation layer, and the outer cover of the right glass fiber insulation layer is provided with a right insulation cover for fixing the right glass fiber insulation layer, and the left insulation cover and the right insulation cover are fixedly connected by a crimping structure.

[0007] In the above-mentioned muffler for a sled vehicle, the left heat shield and the right heat shield are made of metal sheets with excellent toughness. Preferably, the left heat shield and the right heat shield are both aluminum plates.

[0008] In the above-mentioned muffler for a sled vehicle, the curling structure includes: a long connecting end formed on one heat insulation cover and a short connecting end formed on another heat insulation cover, and the long connecting end is bent to form a winding end that wraps the short connecting end.

[0009] In the above-mentioned muffler for a sled, the inner side surface of the long connection end is in contact with the inner side surface of the short connection end, and the inner side surface of the winding end is in contact with the outer side surface of the short connection end.

[0010] In the above-mentioned muffler for a sled vehicle, the long connecting end portion and the short connecting end portion are provided with more than two bends.

[0011] In the above-mentioned muffler for a sled vehicle, a first partition and a second partition are arranged in the shell assembly, and the first partition and the second partition divide the inner cavity of the muffler into an air inlet cavity, an intermediate cavity and an air outlet cavity. An air inlet pipe connected to the air inlet cavity and an air outlet pipe connected to the air outlet cavity are arranged on the shell assembly. A hole-shaped structure connecting the air inlet cavity and the intermediate cavity is arranged on the first partition, and a hole-shaped structure connecting the intermediate cavity and the air outlet cavity is arranged on the second partition.

[0012] In the above-mentioned muffler for a sled vehicle, an inner tube is arranged in the middle of the first partition, one end of the inner tube extends into the air inlet cavity and is arranged in a bell-mouth structure, the other end of the inner tube extends into the middle cavity and is provided with a plugging cover, and a plurality of ventilation holes are arranged on the inner tube body in the middle cavity.

[0013] In the above-mentioned muffler for a sled vehicle, preferably, the muffler is a double air intake pipe structure.

[0014] In the above-mentioned muffler for a sled vehicle, preferably, the aperture of the vent hole is larger than the aperture of the hole-shaped structure.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model provides a muffler for a sled vehicle. In view of the great temperature difference between the ambient temperature and the exhaust temperature of the sled vehicle, a double-layer glass fiber insulation structure is provided by an inner shell, an outer shell and a heat insulation cover, which can greatly improve the heat insulation performance of the muffler and meet the use requirements of the sled vehicle. At the same time, the outer glass fiber insulation structure of the utility model adopts a combination of left and right glass fiber insulation layers and left and right heat insulation covers, and is fixed by a crimping structure, which can reduce the difficulty of assembly and increase the thickness of the glass fiber insulation layer.

[0017] 2. The utility model improves the ventilation structure in the muffler, and adopts a combination of an inner tube and micropores. When the sled vehicle is in an idling state, the gas can flow smoothly through the hole-shaped structure on the partition. When the sled vehicle is in a high-speed state, the gas can be ventilated simultaneously through the ventilation holes on the inner tube and the hole-shaped structure on the partition, thereby further reducing the exhaust noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a partial schematic diagram of the thermal insulation structure of the utility model;

[0020] Figure 3It is a structural schematic diagram of the inner tube of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the first partition of the utility model;

[0022] Figure numerals: 1. Shell assembly; 2. Left fiberglass insulation layer; 3. Right fiberglass insulation layer; 4. Left insulation cover; 5. Right insulation cover; 6. Long connection end; 7. Short connection end; 8. Winding end; 9. First partition; 10. Second partition; 11. Air inlet cavity; 12. Middle cavity; 13. Air outlet cavity; 14. Air inlet pipe; 15. Air outlet pipe; 16. Hole-shaped structure; 17. Inner pipe; 18. Bell-mouth structure; 19. Blocking cover; 20. Vent. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings. Figure 1-4 :

[0024] A muffler for a sled comprises a shell assembly 1, wherein the shell assembly 1 comprises an inner shell and an outer shell, wherein a glass fiber heat insulation layer is filled between the inner shell and the outer shell; the left and right sides of the shell assembly 1 are respectively wrapped with a left glass fiber heat insulation layer 2 and a right glass fiber heat insulation layer 3, wherein the end surfaces of the left glass fiber heat insulation layer 2 and the right glass fiber heat insulation layer 3 are in contact with each other and form an annular structure, the outer cover of the left glass fiber heat insulation layer 2 is provided with a left heat insulation cover 4 for fixing the left glass fiber heat insulation layer 2, and the outer cover of the right glass fiber heat insulation layer 3 is provided with a right heat insulation cover 5 for fixing the right glass fiber heat insulation layer 3, and the left heat insulation cover 4 and the right heat insulation cover 5 are fixedly connected by a crimping structure.

[0025] In this embodiment, the inner shell, the glass fiber insulation layer and the outer shell are first formed into a shell assembly 1 by welding, and then the left glass fiber insulation layer 2, the left insulation cover 4, the right glass fiber insulation layer 3 and the right insulation cover 5 are respectively covered on the shell assembly 1 from the left and right sides, and finally the ends of the left insulation cover 4 and the right insulation cover 5 are rolled up by crimping to form a fixed structure and the left glass fiber insulation layer 2 and the right glass fiber insulation layer 3 are pressed to be firmly wrapped outside the shell assembly 1. In this embodiment, the double-layer insulation structure greatly increases the insulation performance of the muffler, so that it can better adapt to the sled.

[0026] In this embodiment, the left heat insulation cover 4 and the right heat insulation cover 5 are both made of aluminum plates.

[0027] Compare with Figure 2 The curling structure includes: a long connecting end 6 formed on the right heat insulation cover 5, and a short connecting end 7 formed on the left heat insulation cover 4. The long connecting end 6 is bent to form a winding end 8 that wraps the short connecting end 7.

[0028] Furthermore, the inner side surface of the long connection end 6 is in contact with the inner side surface of the short connection end 7 , and the inner side surface of the winding end 8 is in contact with the outer side surface of the short connection end 7 .

[0029] Preferably, the long connecting end portion 6 and the short connecting end portion 7 are provided with more than two bends.

[0030] The specific curling method of this embodiment is: before installation, the long connecting end 6 of the right heat insulation cover 5 is bent outward in the vertical direction, and the short connecting end 7 of the left heat insulation cover 4 is bent outward in the vertical direction, and then the left heat insulation cover 4 and the right heat insulation cover 5 are covered outside the left glass fiber insulation layer 2 and the right glass fiber insulation layer 3. After covering, the inner side surfaces of the long connecting end 6 and the short connecting end 7 are in contact and connected, and then the winding end 8 is bent in the direction of the short connecting end 7 until the inner side surface of the winding end 8 is in contact and connected with the outer side surface of the short connecting end 7 to form a wrapping structure, and finally, they are bent downward at the same time in the same direction to complete the curling.

[0031] Compare with Figure 1 The specific structure of the muffler of this embodiment is: the shell assembly 1 is provided with a first partition plate 9 and a second partition plate 10, the first partition plate 9 and the second partition plate 10 divide the inner cavity of the muffler into an air inlet cavity 11, an intermediate cavity 12 and an air outlet cavity 13, the shell assembly 1 is provided with an air inlet pipe 14 connected to the air inlet cavity 11 and an air outlet pipe 15 connected to the air outlet cavity 13, the first partition plate 9 is provided with a hole-shaped structure 16 connecting the air inlet cavity 11 and the intermediate cavity 12, and the second partition plate 10 is provided with a hole-shaped structure 16 connecting the intermediate cavity 12 and the air outlet cavity 13.

[0032] Furthermore, an inner tube 17 is provided in the middle of the first partition 9, one end of the inner tube 17 extends into the air inlet cavity 11 and is provided with a bell-mouth structure 18, the other end of the inner tube 17 extends into the middle cavity 12 and is provided with a plug cover 19, and a plurality of ventilation holes 20 are provided on the tube body of the inner tube 17 in the middle cavity 12.

[0033] In this embodiment, the muffler is a double air intake pipe 14 structure.

[0034] Preferably, the aperture of the vent hole 20 is larger than the aperture of the hole-shaped structure 16 .

[0035] The muffler principle of this embodiment is: high-temperature and high-speed gas enters the intake chamber 11 from the intake pipe 14, hits the first partition 9, then repeatedly turns around and enters the middle chamber 12 through the hole-shaped structure 16 of the first partition 9 and the vent 20 of the inner tube 17, the gas entering the middle chamber 12 hits the second partition 10, then repeatedly turns around and enters the outlet chamber 13 through the hole-shaped structure 16 of the second partition 10, and finally is discharged from the muffler through the arc-shaped outlet pipe 15, and the noise is gradually attenuated through the above circulation process, thereby achieving the muffler effect. When the sled is idling, the exhaust volume is low. Since the air flow in the muffler is driven by air pressure, and the gas flow path of the inner tube 17 is relatively tortuous, the air pressure at this time is not enough to allow the exhaust to pass through the vent 20. Therefore, through the hole-shaped structure 16 on the first partition 9, the sled can also be exhausted smoothly when idling. When the sled is running at high speed, the vent holes 20 of the inner tube 17 provide a gas flow path with a larger aperture for the high-temperature and high-speed gas. By exhausting the gas simultaneously through the hole-shaped structure 16 and the vent holes 20, a better sound-absorbing effect can be obtained.

[0036] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A muffler for a sled, characterized in that: The invention comprises a shell assembly (1), wherein the shell assembly (1) comprises an inner shell and an outer shell, wherein a glass fiber heat insulation layer is filled between the inner shell and the outer shell; the left and right sides of the shell assembly (1) are respectively wrapped with a left glass fiber heat insulation layer (2) and a right glass fiber heat insulation layer (3), wherein the end faces of the left glass fiber heat insulation layer (2) and the right glass fiber heat insulation layer (3) are in contact with each other and form an annular structure; the outer cover of the left glass fiber heat insulation layer (2) is provided with a left heat insulation cover (4) for fixing the left glass fiber heat insulation layer (2), and the outer cover of the right glass fiber heat insulation layer (3) is provided with a right heat insulation cover (5) for fixing the right glass fiber heat insulation layer (3); and the left heat insulation cover (4) and the right heat insulation cover (5) are fixedly connected by a crimping structure.

2. A muffler for a sled according to claim 1, characterized in that: The left heat insulation cover (4) and the right heat insulation cover (5) are both made of aluminum plates.

3. A muffler for a sled according to claim 1, characterized in that: The curling structure comprises: a long connecting end (6) formed on one heat insulation cover and a short connecting end (7) formed on the other heat insulation cover, wherein the long connecting end (6) is bent to form a winding end (8) that wraps around the short connecting end (7).

4. A muffler for a sled according to claim 3, characterized in that: The inner side surface of the long connection end (6) is in contact with the inner side surface of the short connection end (7), and the inner side surface of the winding end (8) is in contact with the outer side surface of the short connection end (7).

5. A muffler for a sled according to claim 4, characterized in that: The long connecting end (6) and the short connecting end (7) are provided with more than two bends.

6. A muffler for a sled according to claim 1, characterized in that: The shell assembly (1) is provided with a first partition plate (9) and a second partition plate (10), the first partition plate (9) and the second partition plate (10) dividing the inner cavity of the muffler into an air inlet cavity (11), an intermediate cavity (12) and an air outlet cavity (13); the shell assembly (1) is provided with an air inlet pipe (14) connected to the air inlet cavity (11) and an air outlet pipe (15) connected to the air outlet cavity (13); the first partition plate (9) is provided with a hole-shaped structure (16) connecting the air inlet cavity (11) and the intermediate cavity (12); the second partition plate (10) is provided with a hole-shaped structure (16) connecting the intermediate cavity (12) and the air outlet cavity (13).

7. A muffler for a sled according to claim 6, characterized in that: An inner tube (17) is provided in the middle of the first partition plate (9), one end of the inner tube (17) extends into the air inlet cavity (11) and is provided with a bell-mouth structure (18), the other end of the inner tube (17) extends into the middle cavity (12) and is provided with a plugging cover (19), and a plurality of ventilation holes (20) are provided on the inner tube (17) in the middle cavity (12).

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