Silencer assembly of electric light truck

Abstract

The utility model discloses a silencer assembly of an electric light truck, which relates to the technical field of automobile silencers, and comprises a silencer shell, a barrier plate I, a barrier plate II and a barrier plate III are arranged on the inner side of the silencer shell, a resistance expansion cavity is formed between the barrier plate I and the silencer shell, and a resistance expansion cavity is formed between the barrier plate II and the silencer shell. A first-stage Helmholtz resonant cavity is formed among the second barrier plate, the first barrier plate and the silencer shell, a resistive cavity is formed between the third barrier plate and the silencer shell, and a second-stage Helmholtz resonant cavity is formed among the third barrier plate, the second barrier plate and the silencer shell. An air inlet pipeline is arranged in the resistive cavity, the air outlet end of the air inlet pipeline extends into the second-stage Helmholtz resonant cavity, an air outlet pipeline is arranged in the resistive cavity, and the air inlet end of the air outlet pipeline extends into the first-stage Helmholtz resonant cavity. According to the electric light truck silencer assembly, broadband efficient noise reduction is achieved through cooperation of the three layers of composite shells and the multi-stage silencing structure.

Description

Technical Field

[0001] This utility model relates to the field of automotive muffler technology, specifically to an electric light truck muffler assembly. Background Technology

[0002] With the increasing popularity of electric freight vehicles, noise control of their drive systems (such as motors and reducers) has become crucial for improving driving comfort and meeting environmental regulations. Compared to traditional fuel-powered trucks, the noise spectrum of electric light trucks is dominated by mid-to-high frequency electromagnetic noise and mechanical noise, but some low-frequency noise still needs to be effectively suppressed. As a core noise reduction component, the performance of the muffler directly affects the overall NVH level of the vehicle.

[0003] Traditional noise reduction technologies are mainly divided into two categories: resistive silencers rely on sound-absorbing materials (such as glass wool and rock wool) to consume sound energy, and are good at dealing with mid-to-high frequency noise, but have limited effect on low frequencies. Moreover, the materials are prone to aging, pulverization or blockage in high-temperature, humid or oily environments, resulting in rapid performance degradation. Reactive silencers, on the other hand, utilize acoustic impedance mismatch (such as expansion cavities, contraction cavities, and Helmholtz resonant cavities) to cancel sound waves through reflection or interference. They are effective in specific low-frequency bands, but have weak high-frequency noise reduction capabilities and a narrow frequency band.

[0004] To broaden the noise reduction frequency band, composite mufflers combining resistive and reactive principles are widely used. However, existing designs have insufficient low-frequency coverage, and a single reactive structure is difficult to effectively cover multiple low-frequency noise peaks of electric vehicles. The mid-to-high frequency durability is poor, and traditional sound-absorbing materials cannot maintain their performance for long under harsh conditions. The muffler housing may vibrate due to internal airflow pulsation and external excitation, becoming a new source of radiated noise.

[0005] Therefore, in order to address the above problems, the applicant needs to design an electric light truck muffler assembly to solve the problem. Utility Model Content

[0006] The purpose of this utility model is to provide an electric light truck muffler assembly to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an electric light truck muffler assembly, comprising a muffler housing, a first baffle plate disposed on the inner side of the muffler housing, forming a resistive expansion cavity between the first baffle plate and the muffler housing, a second baffle plate disposed on the inner side of the muffler housing, forming a primary Helmholtz resonant cavity between the second baffle plate, the first baffle plate, and the muffler housing, a third baffle plate disposed on the inner side of the muffler housing, forming a resistive cavity between the third baffle plate and the second baffle plate, forming a secondary Helmholtz resonant cavity between the third baffle plate, the second baffle plate, and the muffler housing, an air inlet pipe disposed within the resistive expansion cavity, with the air outlet of the air inlet pipe extending into the secondary Helmholtz resonant cavity, and an air outlet pipe disposed within the resistive cavity, with the air inlet of the air outlet pipe extending into the primary Helmholtz resonant cavity.

[0008] Furthermore, the air intake end of the air intake pipe extends to the outside of the muffler housing and is fixedly provided with a connecting flange.

[0009] Furthermore, the outlet end of the air outlet pipe extends to the outside of the muffler housing and is fixedly provided with a connecting flange two.

[0010] Furthermore, the muffler housing is provided with an outer layer, a middle layer and an inner layer from the outside to the inside, and the outer side and the inner side of the middle layer are respectively attached to the inner side of the outer layer and the outer side of the inner layer.

[0011] Furthermore, the outer layer is made of aluminum-zinc coated steel sheet.

[0012] Furthermore, the intermediate layer is made of open-cell aluminum foam.

[0013] Furthermore, the inner layer is made of carbon fiber reinforced polypropylene composite board.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the electric light truck muffler assembly achieves wide-band high-efficiency noise reduction through the synergistic effect of a three-layer composite shell and a multi-stage sound-absorbing structure, as detailed below:

[0015] When the electric light truck muffler assembly is in use, the engine exhaust gas first enters the intake pipe through connecting flange one, and the airflow is directly discharged from the intake pipe outlet into the secondary Helmholtz resonant cavity. In this cavity, sound waves of a specific frequency enter the chamber through the openings on the cavity wall, generate resonance, and are consumed. Subsequently, the airflow carrying the remaining noise passes through the channel on baffle plate two and enters the primary Helmholtz resonant cavity. This cavity again absorbs noise of a specific frequency band through the principle of resonance. Then, the airflow enters the resistive cavity through the channel on baffle plate three, and converts sound energy into heat energy through friction and viscosity, mainly dealing with mid-to-high frequency noise. Finally, the airflow that has undergone multi-stage silencing is discharged through the exhaust pipe and connecting flange two. During this process, the resistive expansion cavity formed between the intake pipe outlet and the primary Helmholtz resonant cavity generates acoustic impedance through the abrupt change in cross-section, reflecting some low-frequency sound waves, thereby achieving silencing.

[0016] When in use, the muffler assembly of this electric light truck has a sandwich shell structure consisting of an outer layer of aluminum-zinc coated steel, an intermediate layer of open-cell foamed aluminum, and an inner layer of carbon fiber reinforced polypropylene. This structure effectively blocks internal noise from radiating outward and absorbs the vibration energy of the shell, thereby achieving a wide-bandwidth and high-efficiency noise reduction effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0018] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the layered structure of the muffler housing of this utility model;

[0020] Figure 4 This is a schematic diagram of the layered distribution of the muffler housing of this utility model.

[0021] In the diagram: 1. Muffler housing; 2. Connecting flange one; 3. Connecting flange two; 4. Baffle plate one; 5. Inlet pipe; 6. Resistant expansion cavity; 7. Baffle plate two; 8. First-stage Helmholtz resonant cavity; 9. Baffle plate three; 10. Outlet pipe; 11. Resistive cavity; 12. Second-stage Helmholtz resonant cavity; 100. Outer layer; 101. Middle layer; 102. Inner layer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1-4 As shown, the present invention discloses an electric light truck muffler assembly, comprising a muffler housing 1, a baffle plate 4 disposed on the inner side of the muffler housing 1, forming a resistive expansion cavity 6 between the baffle plate 4 and the muffler housing 1, a baffle plate 7 disposed on the inner side of the muffler housing 1, forming a primary Helmholtz resonant cavity 8 between the baffle plate 7, the baffle plate 7, the baffle plate 4, and the muffler housing 1, a baffle plate 9 disposed on the inner side of the muffler housing 1, forming a resistive cavity 11 between the baffle plate 9, the baffle plate 9, the baffle plate 7, and the muffler housing 1, forming a secondary Helmholtz resonant cavity 12, an air inlet pipe 5 disposed in the resistive expansion cavity 6, and an air outlet end of the air inlet pipe 5 extending into the secondary Helmholtz resonant cavity 12, and an air outlet pipe 10 disposed in the resistive cavity 11, with the air inlet end of the air outlet pipe 10 extending into the primary Helmholtz resonant cavity 8.

[0024] The intake end of the intake pipe 5 extends to the outside of the muffler housing 1 and is fixedly provided with a connecting flange 2. By providing the connecting flange 2 at the intake end of the intake pipe 5, it is easy to quickly and securely connect the muffler assembly with the vehicle's intake system, which enhances the sealing performance, reduces the risk of gas leakage, simplifies the installation and maintenance process, and improves the assembly efficiency and reliability of the whole vehicle.

[0025] The outlet end of the exhaust pipe 10 extends to the outside of the muffler housing 1 and is fixedly provided with a connecting flange 2 3. By providing a connecting flange 2 3 at the outlet end of the exhaust pipe 10, the muffler assembly and the exhaust system can be conveniently connected, ensuring the sealing and stability of the exhaust process, reducing the loosening or leakage problems caused by vibration, thereby improving the noise reduction effect and system durability.

[0026] The muffler housing 1 is provided with an outer layer 100, a middle layer 101 and an inner layer 102 from the outside to the inside. The outer side and the inner side of the middle layer 101 are respectively attached to the inner side of the outer layer 100 and the outer side of the inner layer 102. The muffler housing 1 adopts a three-layer composite structure of outer layer 100, middle layer 101 and inner layer 102, which significantly enhances the overall sound insulation, vibration reduction and mechanical strength. The outer layer 100 provides basic protection, the middle layer 101 absorbs vibration energy, and the inner layer 102 is in direct contact with the airflow. The three work together to effectively suppress the propagation of mid-to-high frequency noise and improve the impact resistance of the muffler under harsh road conditions.

[0027] The outer layer 100 is made of aluminum-zinc coated steel sheet. The use of aluminum-zinc coated steel sheet in the outer layer 100 gives the muffler excellent corrosion resistance and weather resistance, which can resist environmental erosion such as rainwater and salt spray, and extend the service life of the muffler. At the same time, its high strength and low cost characteristics reduce the maintenance frequency and the overall vehicle operating cost, making it particularly suitable for the variable working conditions of electric light trucks.

[0028] The intermediate layer 101 is made of open-cell foamed aluminum. The use of open-cell foamed aluminum in the intermediate layer 101 provides excellent sound absorption performance and lightweight advantages. The open-cell structure can efficiently dissipate sound wave energy and absorb mid-to-low frequency noise. At the same time, the low density of foamed aluminum reduces the overall weight of the muffler and optimizes the energy efficiency and space layout of the electric light truck.

[0029] The inner layer 102 is made of carbon fiber reinforced polypropylene composite board. The inner layer 102 uses carbon fiber reinforced polypropylene composite board material, which combines high heat resistance, chemical corrosion resistance and lightweight characteristics. It can withstand the high temperature of exhaust and chemical media erosion, reduce the aging of the inner wall, and at the same time, carbon fiber reinforcement improves the structural rigidity, ensures the long-term stable operation of the silencing cavity, and supports the lightweight design goal of electric vehicles.

[0030] Working Principle: When using this electric light truck muffler assembly, engine exhaust gas first enters the intake pipe 5 through connecting flange 2. The airflow is then directly discharged from the outlet of intake pipe 5 into the secondary Helmholtz resonant cavity 12. Within this cavity, sound waves of a specific frequency enter the chamber through openings in the cavity wall, generating resonance and being consumed. Subsequently, the airflow carrying the remaining noise passes through the channel on baffle plate 7 and enters the primary Helmholtz resonant cavity 8. This cavity again absorbs noise of a specific frequency band through resonance. Next, the airflow enters the resistive cavity 11 through the channel on baffle plate 9, where friction and viscosity are used to absorb the noise. Sound energy is converted into heat energy, mainly dealing with mid-to-high frequency noise. Finally, the airflow, after multi-stage noise reduction, is discharged through the exhaust pipe 10 and connecting flange 2 3. During this process, the resistive expansion cavity 6 formed between the outlet of the intake pipe 5 and the first-stage Helmholtz resonant cavity 8 generates acoustic impedance through abrupt changes in cross-section, reflecting some low-frequency sound waves. At the same time, the sandwich shell structure composed of an aluminum-zinc coated steel outer layer 100, an open-cell foam aluminum intermediate layer 101, and a carbon fiber reinforced polypropylene inner layer 102 effectively blocks internal noise from radiating outward and absorbs shell vibration energy, thereby achieving a wide-bandwidth and high-efficiency noise reduction effect.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An electric light truck muffler assembly, comprising a muffler housing (1), characterized in that, A first baffle plate (4) is provided on the inner side of the muffler housing (1), and a resistance expansion cavity (6) is formed between the first baffle plate (4) and the muffler housing (1). A second baffle plate (7) is provided on the inner side of the muffler housing (1), and a first-order Helmholtz resonance cavity (8) is formed between the second baffle plate (7), the first baffle plate (4), and the muffler housing (1). A third baffle plate (9) is provided on the inner side of the muffler housing (1), and a third baffle plate (9) is provided on the inner side of the muffler housing (1). A resistive cavity (11) is formed between the three baffles (9), the two baffles (7), and the muffler housing (1). A secondary Helmholtz resonant cavity (12) is formed between the three baffles (9), the two baffles (7), and the muffler housing (1). An air inlet pipe (5) is provided in the resistive expansion cavity (6), and the air outlet end of the air inlet pipe (5) extends into the secondary Helmholtz resonant cavity (12). An air outlet pipe (10) is provided in the resistive cavity (11), and the air inlet end of the air outlet pipe (10) extends into the primary Helmholtz resonant cavity (8).

2. The electric light truck muffler assembly according to claim 1, characterized in that: The air intake end of the air intake pipe (5) extends to the outside of the muffler housing (1) and is fixedly provided with a connecting flange (2).

3. The electric light truck muffler assembly according to claim 1, characterized in that: The outlet end of the air outlet pipe (10) extends to the outside of the muffler housing (1) and is fixedly provided with a connecting flange two (3).

4. The electric light truck muffler assembly according to claim 1, characterized in that: The muffler housing (1) is provided with an outer layer (100), a middle layer (101) and an inner layer (102) from the outside to the inside, and the outer side of the middle layer (101) and the inner side of the middle layer (101) are respectively attached to the inner side of the outer layer (100) and the outer side of the inner layer (102).

5. The electric light truck muffler assembly according to claim 4, characterized in that: The outer layer (100) is made of aluminum-zinc coated steel sheet.

6. The electric light truck muffler assembly according to claim 4, characterized in that: The intermediate layer (101) is made of open-cell aluminum foam.

7. The electric light truck muffler assembly according to claim 4, characterized in that: The inner layer (102) is made of carbon fiber reinforced polypropylene composite board.

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