CN113294388A - Air inlet multi-cavity perforated silencer based on additive manufacturing process - Google Patents
Air inlet multi-cavity perforated silencer based on additive manufacturing process Download PDFInfo
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- CN113294388A CN113294388A CN202110704900.4A CN202110704900A CN113294388A CN 113294388 A CN113294388 A CN 113294388A CN 202110704900 A CN202110704900 A CN 202110704900A CN 113294388 A CN113294388 A CN 113294388A
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- silencer
- air inlet
- pipe
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- additive manufacturing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention belongs to the technical field of air inlet systems of passenger vehicles, and relates to an air inlet multi-cavity perforated silencer based on an additive manufacturing process; the first part comprises an air inlet pipe and a silencer outer pipe; the second part comprises an air outlet pipe, a silencer core pipe and a silencing cavity partition plate; the two parts are spliced to form an assembly; the silencer core pipe and the silencer outer pipe adopt a plug-in structure and are sealed by a fin-shaped sealing ring; the joint of the silencer core pipe and the air inlet pipe is additionally provided with a lower circular mushroom-shaped sealing ring and an upper circular mushroom-shaped sealing ring; flanges are added on the core pipe and the outer pipe of the silencer, and an aluminum alloy plate is added at the flange for reinforcement; a triangular ring groove is added on the sound attenuation cavity partition plate, and the cross section of the sound attenuation cavity partition plate added with the sealing ring is designed into a triangular belt fin shape; the silencer was printed using PA66+ GF30 powder; the core tube is detachable, so that only the core tube needs to be printed during scheme iteration, and development cost and period can be reduced; different positions adopt different sealing forms, so that the sealing continuity is ensured; the printing deformation can be inhibited to the maximum extent; the installation is easy.
Description
Technical Field
The invention belongs to the technical field of air inlet systems of passenger vehicles, and relates to an air inlet multi-cavity perforated silencer based on an additive manufacturing process.
Background
The multi-cavity perforated silencer for reducing noise of the turbocharger utilizes the Helmholtz resonator principle, has a compact structure, meets the installation requirement, has a good silencing effect on broadband noise, and has the main structure of a main pipeline (core pipe) and a plurality of annular resonant cavities, wherein a plurality of sound-absorbing micropores are arranged on the core pipe and respectively communicated with each resonant cavity. In the early development and test verification stage, the requirement of parts is usually less, the cost factor is considered, expensive mass production molds cannot be used for manufacturing, at present, the ideal test result cannot be achieved through the following 5 modes of trial production, and the development process is seriously influenced.
Firstly, after steel is processed in a numerical control mode, the total length of the steel is over 200mm, and because the wall thicknesses of the core tube and the partition plate are only 3mm, vibration and clamping deformation are generated in the processing process, the volume of the anechoic cavity is inaccurate, gaps are generated in tailor welding, and the test result is influenced. The weight is 7 times of that of a mass-produced part, and the assembly state of adjacent parts is influenced by overlarge weight;
integrated 3D printing: because the silencing cavity and the core pipe which can be communicated with the outside only have small holes with the diameter of 3 mm-5 mm, the support removal or the complete powder cleaning cannot be realized, on one hand, the volume of the silencing cavity is influenced, and on the other hand, the powder is easy to enter and damage the engine;
thirdly, dividing the core tube and the partition plate into a plurality of sections for split printing: each layer of core tube is inserted into the outer tube for bonding and fixing after being coated with glue, and because the outer tube is deep and long, the mode cannot completely and uniformly coat the glue, the sound attenuation cavities and the sound attenuation cavities are communicated with the outside, and the position degree between micropores on the core tube is difficult to ensure;
fourthly, opening a skylight from the side wall of the outer pipe: the skylight part and the body are respectively printed, the mode is favorable for clearing powder, but the mode of disassembling from one side can generate larger printing deformation, a larger gap is generated at the bonding position, air leakage is easy to generate, and the phenomenon of pipe explosion is easy to generate under the specified working pressure;
integral metal 3D printing: the powder cleaning is difficult, the printing cost is about 7 times of that of nonmetal, and the cost is high.
CN208934831U resonant cavity filters support the utility model provides a can solve the resonant cavity that filters the inefficacy problem and filter support. The resonant cavity filtering support comprises a filter screen and a plastic support, wherein the filter screen is arranged on the inner side of the plastic support and is of an integrated structure. The utility model adopts an integrated structure, effectively avoids the phenomena of unevenness, easy damage and easy falling of the filter screen attaching bracket, and greatly improves the production qualification rate; the production efficiency is effectively improved, the manual wrapping and welding steps after the traditional process bracket is injected are reduced, and the cost is effectively reduced; the filtering performance of the resonant cavity silencer can be economically and conveniently improved, and silencing substances caused by high-speed airflow are prevented from entering a turbocharger and an inner cavity of an engine to damage an automobile power system; different filter screens can be selected according to different use environments and engines with different powers, so that the use rationality is improved, and the service life is prolonged.
CN205841060U muffler for an internal combustion engine of a motor vehicle, the present invention relates to a muffler for an internal combustion engine of a motor vehicle, having: a turbocharger module (2) having a through-passage (20); an inlet connection (21), which can be fastened, in particular detachably, to an outlet connection (1) of a turbocharger of an internal combustion engine; and an outlet interface (22), and a resonance module (3,4), the resonance module (3) having a through channel (30, 40); at least one separate resonance chamber (33; 34) communicating with the through channel (30,40) through at least one throttle valve (34, 44); an inlet connection (31), which can be fastened, in particular detachably or permanently, to an outlet connection (22) of the turbocharger module (2); and an outlet interface (32, 42).
However, the technical solutions related to the above patents have low relevance to the present invention.
The multi-cavity perforated silencer of the air inlet system for reducing the noise of the turbocharger only needs 2-5 air inlet systems to be tested and verified in the early development process, and the cost is extremely high by adopting a mass production method. It is desirable to produce such prototypes in a low cost, low volume, rapid and accurate manner. The existing trial production modes have the defects of influencing the test result, and the flexibility degree is low and the cost is higher.
Disclosure of Invention
The invention aims to solve the technical problem that the small-batch trial production manufacturability is poor and the test requirement cannot be met in the prior art, and provides a method for trial production of an accurate multi-cavity perforated silencer from three aspects of structure, process and material to meet the test requirement.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
a gas inlet multi-cavity perforated silencer based on an additive manufacturing process is divided into two parts, wherein the first part comprises a gas inlet pipe and a silencer outer pipe; the second part comprises an air outlet pipe, a silencer core pipe and a silencing cavity partition plate; the two parts are spliced to form an assembly.
Furthermore, a plug-in structure is adopted between the silencer core tube and the silencer outer tube, and the silencer core tube and the silencer outer tube are sealed by fin-shaped sealing rings.
Furthermore, a mushroom-shaped sealing ring is arranged on the upper portion of the lower portion of the lap joint of the silencer core pipe and the air inlet pipe, the lower portion of the silencer core pipe is clamped into the groove, and the upper portion of the silencer core pipe is circular and provides sealing pressing force.
Further, a flange is added on the core pipe of the silencer and connected through bolts; holes are uniformly distributed at the connecting flange, and reinforcing ribs are correspondingly added in the direction of each hole;
a flange is added at the end part of the outer pipe of the silencer;
and an aluminum alloy plate is additionally arranged at the flange for reinforcement.
Further, the thickness of the fin-shaped sealing ring is 0.25mm, and the height of the fin-shaped sealing ring is 0.35 mm;
the width of the flange is 8.5 mm, the thickness of the reinforcing rib is 4mm, the bottom edge length is 14.25 mm, and the angle is 45 degrees;
the thickness of the aluminum alloy plate is 4 mm.
Furthermore, a triangular ring groove is additionally arranged on the sound attenuation cavity partition plate, and the cross section of the additional sealing ring is designed to be in a triangular belt fin shape.
Further, the thickness of the fin of the triangular finned sealing ring is 0.3 mm, and the height of the fin is 0.4 mm.
Further, the air inlet multi-cavity perforated silencer based on an additive manufacturing process is printed using PA66+ GF30 powder.
Further, the sealing ring uses a silicone rubber material. And the air inlet multi-cavity perforated silencer based on the additive manufacturing process is dried after being cleaned in an ultrasonic cleaning machine.
Further, the outer pipe of the silencer is heated to 80-100 ℃ of temperature difference with the core pipe of the silencer in an air heating mode, the outer pipe of the silencer is taken out and then quickly inserted into the core pipe of the silencer, and after cooling, an aluminum alloy fixing plate is additionally arranged and the bolt is screwed down.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the core tube with the partition board and the outer tube which are separated from each other and made of nylon and glass fiber materials, adopts the mode of splicing after the material increase manufacturing process SLS or MJF printing, and uses the silicon rubber cushion to seal the gap between the partition board and the outer tube, and has the following advantages:
the core tube is flexible, and only the core tube needs to be printed during scheme iteration due to the fact that the core tube is detachable, so that development cost and period can be reduced.
Different positions adopt different sealing forms: the tail part is sealed by a butt joint rubber gasket, the partition part is sealed by a groove-circular rubber gasket, the end surface is sealed by a bolt flange, a groove and a circular rubber ring, the thickness of the sealing gasket is determined according to the internal pressure requirement and the compression characteristic of the rubber gasket, and the sealing continuity is ensured;
③ the powder is easy to be cleaned;
fourthly, the structure can restrain the printing deformation to the maximum extent.
Easy installation: the assembly process of the core tube and the outer tube is thermal expansion assembly and is connected through five evenly distributed bolts.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural decomposition diagram of an air inlet multi-cavity perforated silencer based on an additive manufacturing process according to the present invention;
FIG. 2 is a sectional view taken along line 1-1 of FIG. 1;
FIG. 3 is a schematic view of an added flange reinforcement plate;
FIG. 4 is a schematic view of the muffler core tube increasing in width;
FIG. 5 is a schematic view of the addition of an annular groove;
FIG. 6 is a schematic view of a flange hole and a reinforcing rib;
FIG. 7 is a schematic view of the position of an aluminum alloy reinforcing plate;
FIG. 8 is a schematic view of an outer tube end flange;
FIG. 9a is a schematic view of the core tube plugging and sealing structure;
FIG. 9b is a partial enlarged view of the core tube plugging and sealing structure;
FIG. 10 is a schematic view of a flange interface mushroom-type cross-sectional seal ring;
FIG. 11 is a schematic view of a V-ribbed sealing ring between the baffle plate and the outer tube wall;
in the figure:
1. the external structure of the original silencer;
2. the internal structure of the original silencer;
3. the integral external structure of the silencer is improved;
4. one of the modified silencer parts: an air outlet pipe and a silencer core pipe which comprise a silencing cavity partition plate;
5. one of the modified silencer parts: an air inlet pipe and an outer silencer pipe;
8. the annular groove is used for assembling the round mushroom-shaped silicon rubber sealing ring;
9. annular groove for mounting triangular sealing ring with fins
10. And mounting a rectangular annular groove with a fin sealing ring.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the 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. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
The invention is described in detail below with reference to the attached drawing figures:
the scheme is explained from three aspects of structure, material and process.
(1) Structural aspects
The first part includes air inlet pipe and outer pipe of silencer. The second part is an air outlet pipe, a silencer core pipe and a silencing cavity partition plate. The two parts are spliced to form an assembly. This enables smooth removal of residual powder adhering to the surface of the part. As shown in fig. 1 and 2:
the first arrow in fig. 1 indicates the appearance change from the original muffler structure;
the second arrow in fig. 1 indicates the manner of splitting by the altered structure;
"+" indicates that the split silencer is split into two parts.
② the lapping position of the outer sides of the two parts, as shown in figure 3, the arrow part represents the lapping position. Referring to fig. 4, the core tube of the silencer is increased in width by 8.5 mm flanges, and is connected by bolts. 5 holes are uniformly distributed at the connecting flange, reinforcing ribs with the thickness of 4mm are correspondingly added in the direction of each hole, and referring to fig. 6, the length of the bottom edge is 14.25, and the angle is 45 degrees.
And thirdly, reinforcing the aluminum alloy plate with the thickness of 4mm at the flange part, as shown in figure 7:
the thickness of the flange at the end of the outer pipe of the silencer is increased to be 6 mm and the width of the flange is increased to be 10 mm, so as to resist deformation caused by working pressure, and the structure is shown in fig. 8:
the silencer core tube and the silencer outer tube are in a plug-in structure and sealed by a fin-shaped silicon rubber sealing ring, so that the phenomenon that the two parts are separated to generate air leakage due to internal working pressure is avoided, the thickness of each fin is 0.25, and the height of each fin is 0.35. as shown in figures 9a and 9 b:
and sixthly, a mushroom-shaped silicon rubber sealing ring is arranged at the lap joint of the silencer core pipe and the air inlet pipe, the lower part of the mushroom-shaped silicon rubber sealing ring is clamped into the groove, and the upper part of the mushroom-shaped silicon rubber sealing ring is round and provides sealing pressing force. As shown in fig. 10:
and a triangular ring groove is added on the partition plate of the silencing cavity, the cross section of the silicon rubber sealing ring is designed to be in a triangular belt fin shape, the thickness of the fin is 0.3 mm, and the height of the fin is 0.4 mm. The silicon rubber sealing ring is connected with the partition plate in an adhesive manner, so that the rubber ring is prevented from being separated from the annular groove by friction force in the installation process. The triangle shape can ensure the installation accuracy, increase the bonding area, and the arrangement of the fin structure can reduce the installation resistance, as shown in fig. 11.
(2) In the aspect of materials:
the body is printed by PA66+ GF30 powder, so that the quality of a printed trial sample is close to that of a mass-produced part;
the body is one of the parts of the modified silencer: outlet duct and muffler core pipe (including amortization chamber baffle) to and reform transform one of back muffler part: an air inlet pipe and an outer pipe of the silencer.
PA66 is a brand of nylon.
GF30 means 30% glass fiber.
The sealing ring is made of silicon rubber material and can resist temperature of 200 ℃;
the flange gusset plate uses the aluminum alloy material, and on the one hand the at utmost lightens weight, and coefficient of expansion is close nylon on the one hand, avoids the bolt to receive the shearing force.
Referring to fig. 2, the flange reinforcing plate is disposed outside the core tube flange and is stacked on the flange, and fixed together by bolts and nuts to limit the deformation of the flange.
(3) Aspects of the process
Firstly, data processing, namely splitting parts as required, adding an annular groove, a flange, a reinforcing rib, a sealing ring and the like, reserving a polishing allowance of 0.1-0.5 mm on the contact surface of the outer pipe of the space eliminator and the sealing ring, wherein the compression amount of the sealing ring is determined according to local size and selected material brand;
referring to fig. 4, the annular groove is added at the position of the red (r) (+ r) in fig. 4 for assembling the sealing ring, wherein the annular groove at the position of the red (r) triangular (r) annular groove (one is added at the lap joint of each sound attenuation cavity partition plate and the inner side of the outer pipe wall for sealing) is added at the position of the red (r) triangular (r) annular groove (r) (-) triangular (r) annular groove for installing the round mushroom-shaped silicon rubber sealing ring; ninthly, 4 triangular ring grooves are formed for mounting triangular sealing rings with fins, and the ring grooves at the position of the nodes are used for mounting rectangular fin-shaped silicon rubber sealing rings.
Printing: printing by using MJF or SLS technology, and taking out after air cooling along with the furnace;
MJF and SLS are additive manufacturing technologies; MJF is multi-jet fusion flow; SLS: and selective laser sintering.
Grinding: polishing the inner wall of the outer pipe by using an automatic tensioning mechanism with a sand strip, polishing the lap joint by using gauze, and improving the roughness to improve the sealing performance;
fourthly, installing sealing rings at each position: uniformly coating a small amount of high-temperature-resistant sealant at the annular groove, assembling a sealing ring, and drying;
cleaning and drying: putting the two parts which are manufactured into an ultrasonic cleaning machine for cleaning and then drying;
assembly: the outer pipe of the silencer is heated to 80-100 ℃ of temperature difference with the core pipe of the silencer in an air heating mode by adopting a hot mounting mode, the outer pipe of the silencer is taken out and then is rapidly inserted into the core pipe of the silencer, and after cooling, an aluminum alloy fixing plate is additionally mounted and the bolt is screwed down.
The invention uses nonmetal PA66+ GF30 material to print the noise reduction connecting pipe by MJF or SLS mode;
the core pipe, baffle of silencing cavity, air outlet pipe and silencer outer pipe, air inlet pipe of the silencer are split;
a flange is added on the end face of the core pipe of the silencer, and the width of the flange is 8.5 mm;
the flanges are connected through bolts;
arranging a reinforcing rib with the thickness of 4mm at the flange according to the hole position direction of the bolt;
reinforcing the side flange of the core pipe of the silencer by an aluminum alloy plate with the thickness of 4 mm;
a6 mm-thick circular flange is added at the outer pipe side of the silencer;
all sealing rings are made of heat-resistant silicon rubber;
the sealing form between the flanges is a mushroom-shaped rubber ring with an upper circle and a lower circle;
a triangular ring groove is formed in a partition plate on the side wall of the silencing cavity, the sealing ring is in a triangular belt fin shape, and the sealing gasket is in a bonding relation with the groove;
the connecting part of the disassembled silencer core pipe and the silencer outer pipe adopts an inserting structure;
the sealing at the splicing part is in a form of a butt joint rubber ring with fins, and the sealing ring is in a bonding relation with the annular groove;
considering different expansion amount and rigidity, the thickness of the fin at the inserting position of the end part of the silencer core pipe is 0.25mm, and the thickness of the partition plate fin is 0.3 mm;
before assembly, an automatic tensioning mechanism is used for polishing the inner wall of the outer pipe;
the assembly is assembled by adopting a hot-assembling mode, the temperature difference between the outer pipe and the core pipe is heated by an oven to be 80-100 ℃, the outer pipe is taken out and then is rapidly inserted into the core pipe of the silencer, and after the outer pipe is cooled, an aluminum alloy fixing plate is additionally arranged and the bolt is screwed down.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims. And those not described in detail in this specification are well within the skill of those in the art.
Claims (10)
1. The utility model provides a perforation muffler of multicavity of admitting air based on vibration material disk technology which characterized in that: the first part comprises an air inlet pipe and a silencer outer pipe; the second part comprises an air outlet pipe, a silencer core pipe and a silencing cavity partition plate; the two parts are spliced to form an assembly.
2. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 1, characterized in that:
the silencer core pipe and the silencer outer pipe are in an inserted structure and are sealed by fin-shaped sealing rings.
3. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 1, characterized in that:
the joint of the silencer core pipe and the air inlet pipe is additionally provided with a mushroom-shaped sealing ring on the lower part, the lower part is clamped into the groove, and the upper part is circular to provide sealing pressing force.
4. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 2 or 3, characterized in that:
the core pipe of the silencer is additionally provided with a flange which is connected by bolts; holes are uniformly distributed at the connecting flange, and reinforcing ribs are correspondingly added in the direction of each hole;
a flange is added at the end part of the outer pipe of the silencer;
and an aluminum alloy plate is additionally arranged at the flange for reinforcement.
5. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 4, wherein:
the thickness of the fin-shaped sealing ring is 0.25mm, and the height of the fin-shaped sealing ring is 0.35 mm;
the width of the flange is 8.5 mm, the thickness of the reinforcing rib is 4mm, the bottom edge length is 14.25 mm, and the angle is 45 degrees;
the thickness of the aluminum alloy plate is 4 mm.
6. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 4, wherein:
the sound attenuation cavity partition plate is additionally provided with a triangular ring groove, and the cross section of the additional sealing ring is designed to be in a triangular belt fin shape.
7. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 6, wherein:
the thickness of the fin of the triangular finned sealing ring is 0.3 mm, and the height of the fin is 0.4 mm.
8. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 1, characterized in that:
the air inlet multi-chamber perforated silencer based on additive manufacturing process was printed using PA66+ GF30 powder.
9. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 6, wherein:
the sealing ring is made of silicon rubber material;
and the air inlet multi-cavity perforated silencer based on the additive manufacturing process is dried after being cleaned in an ultrasonic cleaning machine.
10. An air inlet multi-chamber perforated silencer based on an additive manufacturing process according to claim 1, characterized in that:
the outer pipe of the silencer is heated to the temperature difference of 80-100 ℃ with the core pipe of the silencer in an air heating mode, the outer pipe of the silencer is taken out and then quickly inserted into the core pipe of the silencer, and after cooling, an aluminum alloy fixing plate is additionally arranged and the bolt is screwed down.
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| CN202110704900.4A CN113294388A (en) | 2021-06-24 | 2021-06-24 | Air inlet multi-cavity perforated silencer based on additive manufacturing process |
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| CN202110704900.4A CN113294388A (en) | 2021-06-24 | 2021-06-24 | Air inlet multi-cavity perforated silencer based on additive manufacturing process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374694A (en) * | 2021-07-13 | 2021-09-10 | 常熟市思源压缩机产业协同创新中心 | Silencer structure and manufacturing method thereof |
| CN113761661A (en) * | 2021-09-10 | 2021-12-07 | 潍柴动力股份有限公司 | Method, device, equipment, medium and product for judging flange hole shear bolt |
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| JP2003343259A (en) * | 2002-05-21 | 2003-12-03 | Toyota Motor Corp | Muffler for internal combustion engine |
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| CN210599179U (en) * | 2019-08-26 | 2020-05-22 | 江苏奥力威传感高科股份有限公司 | Quick-insertion type silencer for automobile turbocharging |
| EP3682987A1 (en) * | 2019-01-18 | 2020-07-22 | The Boeing Company | System and method for fabricating an object |
| CN212614973U (en) * | 2020-07-17 | 2021-02-26 | 恒升三维科技(天津)有限公司 | Vehicle exhaust pipe based on 3D printing |
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| JP2003343259A (en) * | 2002-05-21 | 2003-12-03 | Toyota Motor Corp | Muffler for internal combustion engine |
| CN106545414A (en) * | 2015-09-16 | 2017-03-29 | 通用电气公司 | Deafener pipeline with self-supporting sound-absorbing parts |
| EP3682987A1 (en) * | 2019-01-18 | 2020-07-22 | The Boeing Company | System and method for fabricating an object |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374694A (en) * | 2021-07-13 | 2021-09-10 | 常熟市思源压缩机产业协同创新中心 | Silencer structure and manufacturing method thereof |
| CN113761661A (en) * | 2021-09-10 | 2021-12-07 | 潍柴动力股份有限公司 | Method, device, equipment, medium and product for judging flange hole shear bolt |
| CN113761661B (en) * | 2021-09-10 | 2024-05-17 | 潍柴动力股份有限公司 | Method, device, equipment, medium and product for discriminating flange hole shear bolt |
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Application publication date: 20210824 |
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