Silencer and four-turbine double-exhaust-port diesel engine
By designing a large-cavity muffler with dual inlet and dual outlet pipes, the internal structure of the muffler was optimized, allowing gas to flow through a larger expansion cavity. This solved the space waste problem caused by the parallel arrangement of mufflers, and improved the noise reduction effect and overall compactness.
Patent Information
- Application Number
- CN202520150049.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2035-01-22
AI Technical Summary
For large-scale construction machinery with four-turbo dual-exhaust diesel engines, the existing muffler design requires two mufflers to be arranged side by side when using a single-inlet-single-outlet muffler, which results in wasted space and poor noise reduction effect, affecting the compactness and aesthetics of the whole machine.
A large-cavity muffler with dual inlet and dual outlet pipes was designed. The muffler has a left inlet chamber, a middle chamber, and a right outlet chamber, which are connected by perforated pipes and baffles. The gas flow direction is larger through the expansion chamber, which optimizes the internal structure of the muffler.
It improves the noise reduction effect of the muffler, especially in terms of transmission loss in the 100-1000Hz frequency band, and enhances the compactness and aesthetics of the whole machine.
Smart Images
Figure CN223549330U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of muffler technology, and in particular to a muffler and a four-turbo dual-exhaust diesel engine. Background Technology
[0002] The top view diagram of the engine exhaust muffler commonly used in construction machinery is shown below. Figure 8 As shown, the muffler has a 3-chamber structure. The left chamber is equipped with an air inlet perforated pipe, the middle chamber has a perforated pipe in the middle, and the upper part of the right chamber is an air outlet pipe. The airflow first enters the left chamber through the vent on the air inlet perforated pipe, then diffuses to the middle chamber through the middle perforated pipe, and finally flows into the right chamber through the perforated baffle on the right side and is discharged through the air outlet pipe.
[0003] The main parameters affecting muffler performance include: volume ratio (the ratio of the muffler's internal volume to the engine displacement), perforation rate of the perforated tubes (hole diameter, hole spacing, hole arrangement, etc.), internal perforated tube dimensions, and baffle settings.
[0004] The existing solution has the following shortcomings: The above-mentioned muffler is a single intake pipe and a single exhaust pipe (referred to as "single intake-single exhaust"). For large-displacement four-turbo dual exhaust diesel engines used in large construction machinery, if the above-mentioned "single intake-single exhaust" muffler is used, two mufflers are required, that is, each exhaust port is connected to a "single intake-single exhaust" muffler. In order to ensure that the connecting pipe between the engine and the muffler is short and the overall compactness and aesthetics of the machine are maintained, the two mufflers are generally arranged side by side with a close spacing. This results in the waste of space between the two mufflers. If this space is also included in the volume of the muffler, the noise reduction effect will be further improved, and the overall compactness and aesthetics of the machine will also be improved. Utility Model Content
[0005] The purpose of this utility model is to provide a muffler and a four-turbo dual-exhaust-port diesel engine to solve the problem of wasted space between the two mufflers caused by the parallel arrangement of the two mufflers in the large-displacement four-turbo dual-exhaust-port diesel engine.
[0006] To achieve the above objectives, the present invention provides a muffler, comprising a muffler body, wherein the muffler body has a left air inlet chamber, a middle chamber, and a right air outlet chamber. The left air inlet chamber is provided with two air inlet pipes, the middle chamber is provided with two perforated pipes, and the right air outlet chamber is provided with two air outlet pipes. The two ends of the perforated pipes are respectively connected to the left air inlet chamber and the right air outlet chamber, and a first partition is provided in the middle of the perforated pipe.
[0007] Furthermore, the left air intake chamber is separated from the middle chamber by a second partition, and the middle chamber is separated from the right air outlet chamber by a second partition.
[0008] Furthermore, both ends of the perforated tube are connected to the second partitions on both sides, and the openings of both ends of the perforated tube pass through the second partitions on both sides.
[0009] Furthermore, the two air inlet pipes correspond to the left ends of the two perforated pipes, and the two air outlet pipes correspond to the right ends of the two perforated pipes.
[0010] Furthermore, the two intake pipes are distributed along the front and back, the two perforated pipes are distributed along the front and back, and the two exhaust pipes are distributed along the front and back.
[0011] Furthermore, the intake pipe extends vertically along its axial direction, the perforated pipe extends horizontally along its axial direction, and the exhaust pipe extends vertically along its axial direction.
[0012] Furthermore, the portion of the air intake pipe inserted into the left air intake chamber has a perforated structure, and the portion of the air outlet pipe inserted into the right air outlet chamber has a perforated structure.
[0013] Furthermore, the outer diameter of the air inlet pipe, the perforated pipe, and the air outlet pipe is approximately 240mm ± 10mm, the thickness is 2-3mm, the perforation diameter is 5-6mm, and the hole spacing is 9-10mm.
[0014] Furthermore, the length of the muffler body extends from left to right, and the cross-section of the muffler body is elliptical.
[0015] This utility model also provides a four-turbo dual-exhaust diesel engine, including a four-turbo dual-exhaust diesel engine body and a muffler as described in any of the above technical solutions, wherein the two exhaust ports of the four-turbo dual-exhaust diesel engine body are respectively connected to the two intake pipes of the muffler.
[0016] In summary, the application of the technical solution of this utility model has the following beneficial effects: The structure of this utility model is reasonable. (1) The muffler body is provided with a left intake chamber, a middle chamber and a right exhaust chamber. The left intake chamber is provided with two intake pipes, the middle chamber is provided with two perforated pipes and the right exhaust chamber is provided with two exhaust pipes. Thus, in order to address the problem of wasted space between the two mufflers caused by the parallel arrangement of the two mufflers in the large displacement four-turbo dual exhaust port diesel engine, a large cavity muffler with two intake pipes and two exhaust pipes is designed. (2) The perforated pipe is connected to the left air inlet chamber and the right air outlet chamber at both ends, respectively, and a first baffle is set in the middle of the perforated pipe; thus, the flow direction of gas inside the muffler is as follows: air inlet pipe, left air inlet chamber, left side of the perforated pipe, middle chamber, right side of the perforated pipe, right air outlet chamber, and air outlet pipe. In this way, for each air inlet pipe of the muffler, when the sound wave is incident, it passes through an expansion chamber with a larger volume (more than twice the volume of a "single inlet-single outlet" muffler) for noise reduction, and the noise reduction effect is greatly improved. From this analysis, it can be seen that this utility model designs a large-cavity muffler with double air inlets and double air outlets, and optimizes the internal structure of the muffler, thereby improving the transmission loss of the muffler (an indicator for evaluating the noise reduction effect of the muffler). Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of the silencer of this utility model;
[0018] Figure 2 This is a top view cross-sectional structural diagram of the silencer of this utility model;
[0019] Figure 3 This is another top view cross-sectional structural schematic diagram of the silencer of this utility model;
[0020] Figure 4 This is a top view schematic diagram of the gas flow in the silencer of this utility model;
[0021] Figure 5 This is a front view cross-sectional structural diagram of the silencer of this utility model;
[0022] Figure 6 This is another front view cross-sectional structural schematic diagram of the silencer of this utility model;
[0023] Figure 7 This is a front view schematic diagram of gas flow in the silencer of this utility model;
[0024] Figure 8 This is a schematic diagram of the structure of a muffler in the prior art;
[0025] Explanation of reference numerals in the attached drawings: 1-Muffler body, 101-Left air inlet chamber, 102-Intermediate chamber, 103-Right air outlet chamber; 2-Inlet pipe, 3-Perforated pipe, 4-Outlet pipe, 5-First partition, 6-Second partition, 7-Airflow direction, 8-Perforated area of inlet pipe, 9-Perforated area of outlet pipe, 10-Perforated area of first intermediate pipe, 11-Perforated area of second intermediate pipe. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, but this does not constitute a limitation on the scope of protection of the present utility model.
[0027] In this utility model, for clearer description, the following explanation is provided: The observer faces the attached... Figure 1 When observing, the observer's left side is designated as left, the observer's right side as right, the area in front of the observer as front, the area behind the observer as back, the area above the observer as top, and the area below the observer as bottom. It should be noted that the terms "front end," "rear end," "left side," "right side," "middle," "above," and "below" used in this document indicate the orientation or positional relationship based on the accompanying drawings. These are merely for the purpose of clearly describing the present invention and do not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used only for the purpose of clarity or simplification of description and should not be construed as indicating or implying relative importance or quantity.
[0028] See Figures 1 to 7This embodiment provides a muffler, including a muffler body 1. The muffler body 1 has a left intake chamber 101, a middle chamber 102, and a right exhaust chamber 103 inside. The left intake chamber 101 is provided with two intake pipes 2, the middle chamber 102 is provided with two perforated pipes 3, and the right exhaust chamber 103 is provided with two exhaust pipes 4. The two ends of the perforated pipes 3 are respectively connected to the left intake chamber 101 and the right exhaust chamber 103, and a first partition 5 is provided in the middle of the perforated pipes 3. Function: (1) The muffler body has a left intake chamber, a middle chamber, and a right exhaust chamber inside. The left intake chamber is provided with two intake pipes, the middle chamber is provided with two perforated pipes, and the right exhaust chamber is provided with two exhaust pipes. Therefore, in order to solve the problem of wasted space between the two mufflers caused by the parallel arrangement of the two mufflers in the large displacement four-turbo dual exhaust port diesel engine, a large cavity muffler with two intake pipes and two exhaust pipes is designed. (2) The perforated pipe is connected to the left air inlet chamber and the right air outlet chamber at both ends, respectively, and a first baffle is set in the middle of the perforated pipe; thus, the flow direction of gas inside the muffler is as follows: air inlet pipe, left air inlet chamber, left side of the perforated pipe, middle chamber, right side of the perforated pipe, right air outlet chamber, and air outlet pipe. In this way, for each air inlet pipe of the muffler, when the sound wave is incident, it passes through an expansion chamber with a larger volume (more than twice the volume of a "single inlet-single outlet" muffler) for noise reduction, and the noise reduction effect is greatly improved. From this analysis, it can be seen that this utility model designs a large-cavity muffler with double air inlets and double air outlets, and optimizes the internal structure of the muffler, thereby improving the transmission loss of the muffler (an indicator for evaluating the noise reduction effect of the muffler).
[0029] Specifically, the left intake chamber 101 and the middle chamber 102 are separated by a second partition 6, and the middle chamber 102 and the right exhaust chamber 103 are separated by a second partition 6. Function: The second partition 6 effectively separates the three chambers. Preferably, the three chambers are separated by two large non-perforated partitions (i.e., the preferred second partition 6), and each perforated pipe has a non-perforated plate (i.e., the preferred first partition 5) in the middle to prevent gas from passing through.
[0030] Specifically, the two ends of the perforated pipe 3 are connected to the second partitions 6 on both sides, and the two ends of the perforated pipe 3 pass through the second partitions 6 on both sides. Function: to enable better communication between the three cavities of the left air intake chamber 101, the middle chamber 102, and the right air outlet chamber 103 through the perforated pipe 3, and to block the passage of gas through the first partition 5 and the second partition 6.
[0031] Specifically, the two air inlet pipes 2 correspond to the left ends of the two perforated pipes 3, and the two air outlet pipes 4 correspond to the right ends of the two perforated pipes 3. Function: By matching the positions in pairs, for reference... Figure 4The airflow direction 7 of the two air intake pipes 2 can pass through the air intake pipe, the left air intake chamber, the left side of the perforated pipe, the middle chamber, the right side of the perforated pipe, the right air outlet chamber, and the air outlet pipe in sequence, thereby improving the transmission loss of the muffler.
[0032] Specifically, two intake pipes 2 are distributed front to back, two perforated pipes 3 are distributed front to back, and two exhaust pipes 4 are distributed front to back. Purpose: This arrangement provides greater symmetry and facilitates compatibility with large-displacement four-turbo dual-exhaust-port diesel engines.
[0033] Specifically, the intake pipe 2 extends vertically, the perforated pipe 3 extends horizontally, and the exhaust pipe 4 extends vertically. This design prevents the inlets of the intake pipe 2 and exhaust pipe 4 from directly aligning with the inlet of the perforated pipe 3, thereby reducing the transmission loss of the muffler.
[0034] Specifically, the portion of the intake pipe 2 inserted into the left intake chamber 101 has a perforated structure, and the portion of the exhaust pipe 4 inserted into the right exhaust chamber 103 also has a perforated structure. Function: The perforated structure allows airflow to enter or exit, while simultaneously reducing the transmission loss of the muffler. For details on the perforated structure, please refer to [reference needed]. Figure 5 The perforation structures of the intake pipe 2 and the exhaust pipe 4 are respectively the intake pipe perforation area 8 and the exhaust pipe perforation area 9. The perforation structures on both sides of the perforated pipe 3 are respectively the first intermediate pipe perforation area 10 and the second intermediate pipe perforation area 11.
[0035] Specifically, the outer diameter of the intake pipe 2, the perforated pipe 3, and the exhaust pipe 4 is approximately 240mm ± 10mm, the thickness is 2-3mm, the perforation diameter is 5-6mm, and the perforation spacing is 9-10mm. Function: By optimizing the perforation rate of the perforated pipe and the internal structure of the muffler, the transmission loss of the muffler is improved. Preferably, the perforation arrangement is a "square".
[0036] Specifically, the length of the muffler body 1 extends left and right, and the cross-section of the muffler body 1 is elliptical. Function: This shape facilitates airflow and allows for the symmetrical arrangement of the two perforated pipes, the inlet pipe, and the outlet pipe.
[0037] Specifically, the volumes of the left intake chamber 101, the middle chamber 102, and the right exhaust chamber 103 are approximately equal. This ensures that all three chambers have sufficient working space.
[0038] This utility model also provides a four-turbo dual-exhaust-port diesel engine, including a four-turbo dual-exhaust-port diesel engine body and a muffler according to any of the above-mentioned technical solutions. The two exhaust ports of the four-turbo dual-exhaust-port diesel engine body are respectively connected to the two intake pipes 2 of the muffler. Function: It solves the problem of wasted space between the two mufflers caused by the parallel arrangement of the two mufflers in the large-displacement four-turbo dual-exhaust-port diesel engine.
[0039] It is worth noting that the "dual-inlet-dual-outlet" muffler design mainly considered the transmission losses at 100Hz, 200Hz, 240Hz, 300Hz, 480Hz, 500Hz, 600Hz, 720Hz, 800Hz, 960Hz, and 1000Hz (this engine is a 16-cylinder engine, with commonly used speeds of 750rpm and 1800rpm; the ignition frequency and its multiples are calculated using the formula "speed / 60*8*i", where i is a multiple). It can be observed that the muffler has a transmission loss of 40 < TL < 65 in the 100-600Hz range and a transmission loss of 9 < TL < 35 in the 700-1000Hz range, resulting in good noise reduction for engine exhaust noise at 750rpm and 1800rpm.
[0040] Therefore, this utility model designs a large-cavity muffler with dual intake pipes and dual exhaust pipes, and optimizes the perforation rate of the perforated pipe and the internal structure of the muffler, thereby improving the transmission loss of the muffler in the 100-1000Hz range, and especially improving the noise reduction effect of exhaust noise at 1800rpm.
[0041] Applicable scope: This technical solution is applicable to exhaust noise reduction of large-displacement (e.g., 60L), 16-cylinder, four-turbo, dual-exhaust-port diesel engines used in large-scale engineering machinery.
[0042] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A muffler, comprising a muffler body (1), characterized in that: The muffler body (1) has a left air intake chamber (101), a middle chamber (102), and a right air outlet chamber (103) inside. The left air intake chamber (101) is provided with two air intake pipes (2), the middle chamber (102) is provided with two perforated pipes (3), and the right air outlet chamber (103) is provided with two air outlet pipes (4). The two ends of the perforated pipes (3) are respectively connected to the left air intake chamber (101) and the right air outlet chamber (103), and a first partition (5) is provided in the middle of the perforated pipes (3).
2. The silencer according to claim 1, characterized in that: The left air intake chamber (101) and the middle chamber (102) are separated by a second partition (6), and the middle chamber (102) and the right air outlet chamber (103) are separated by a second partition (6).
3. A silencer according to claim 2, characterized in that: The two ends of the perforated tube (3) are respectively connected to the second partition (6) on both sides, and the two ends of the perforated tube (3) pass through the second partition (6) on both sides.
4. A silencer according to claim 1, characterized in that: The two air inlet pipes (2) correspond to the left ends of the two perforated pipes (3), and the two air outlet pipes (4) correspond to the right ends of the two perforated pipes (3).
5. A silencer according to claim 4, characterized in that: The two air inlet pipes (2) are distributed along the front and back, the two perforated pipes (3) are distributed along the front and back, and the two air outlet pipes (4) are distributed along the front and back.
6. A silencer according to claim 4, characterized in that: The air inlet pipe (2) extends vertically along its axial direction, the perforated pipe (3) extends horizontally along its axial direction, and the air outlet pipe (4) extends vertically along its axial direction.
7. A silencer according to any one of claims 1 to 6, characterized in that: The portion of the air intake pipe (2) inserted into the left air intake chamber (101) has a perforated structure, and the portion of the air outlet pipe (4) inserted into the right air outlet chamber (103) has a perforated structure.
8. A silencer according to claim 7, characterized in that: The outer diameter of the air inlet pipe (2), the perforated pipe (3), and the air outlet pipe (4) is approximately 240mm ± 10mm, the thickness is 2-3mm, the perforation diameter is 5-6mm, and the hole spacing is 9-10mm.
9. A silencer according to any one of claims 1 to 6, characterized in that: The length of the muffler body (1) extends from left to right, and the cross-section of the muffler body (1) is elliptical.
10. A four-turbo dual-exhaust-port diesel engine, comprising a four-turbo dual-exhaust-port diesel engine body, characterized in that: It also includes the muffler according to any one of claims 1 to 9, wherein the two exhaust ports of the four-turbo dual-exhaust-port diesel engine body are respectively connected to the two intake pipes (2) of the muffler.