A dump truck intake and exhaust system and a dump truck

Abstract

This utility model provides an intake and exhaust system for a dump truck and a dump truck itself, relating to the field of transportation technology. The dump truck intake and exhaust system includes an engine, an intake pipe, an air filter, an exhaust pipe, and a muffler. The engine has an intake port and an exhaust port; the intake pipe has an inlet and an outlet, the inlet connecting to the air filter and the outlet connecting to the engine's intake port; the exhaust pipe includes a high-temperature section and a low-temperature section, the engine's exhaust port connecting to the high-temperature section, and the high-temperature section connecting to the muffler via the low-temperature section; wherein, along a first direction, the inlet is higher than the outlet; and / or, the diameter of the high-temperature section is larger than the diameter of the exhaust port. Utilizing gravity-assisted intake creates a natural airflow direction, reducing resistance during the intake process and making the intake smoother. The larger diameter of the high-temperature section reduces the initial flow velocity of the high-temperature exhaust gas, reducing exhaust back pressure and making engine exhaust smoother, thus helping to extend the engine's service life.

Description

Technical Field

[0001] This utility model generally relates to the field of transportation technology, and more specifically, to an intake and exhaust system for a dump truck and a dump truck. Background Technology

[0002] Mining dump trucks operate in harsh environments, and the performance of their intake and exhaust systems directly affects engine efficiency and lifespan. Traditional intake and exhaust system designs are often based on experience and lack scientific optimization methods, easily leading to problems such as poor airflow, large pressure loss, and high noise. Existing mining dump truck intake and exhaust system designs have the following shortcomings:

[0003] 1. The design of the air intake and exhaust pipes is simple. The air intake pipe relies on a single air pressure difference for air intake and is mostly a straight pipe or a simple bend. However, since dump trucks generally work in harsh working environments such as mining areas, the air entering the intake and exhaust system of the dump truck contains a certain amount of dust, which can easily lead to poor airflow and large pressure loss.

[0004] 2. When the exhaust gas from the engine enters the exhaust pipe, the temperature is relatively high. The airflow is prone to generating eddies at bends or joints, which leads to increased pressure loss and affects engine efficiency. Utility Model Content

[0005] This utility model provides an intake and exhaust system for a dump truck and the dump truck itself, which improves airflow efficiency and engine performance.

[0006] According to a first aspect of the present invention, a dump truck intake and exhaust system is provided, comprising:

[0007] An engine, the engine being provided with an air inlet and an air outlet;

[0008] An intake pipe and an air filter, wherein the intake pipe is provided with an inlet and an outlet, the inlet is connected to the air filter, and the outlet is connected to the air intake port of the engine;

[0009] An exhaust pipe and a muffler, wherein the exhaust pipe includes a high-temperature section and a low-temperature section, the exhaust port of the engine is connected to the high-temperature section, and the high-temperature section is connected to the muffler through the low-temperature section;

[0010] Wherein, along the first direction, the inlet is higher than the outlet; and / or, the diameter of the high-temperature section is larger than the diameter of the air outlet.

[0011] In some embodiments, the height difference between the central axis of the inlet and the central axis of the outlet along the first direction is 390 mm to 410 mm.

[0012] In some embodiments, the air intake pipe includes an air intake section, a connecting section, and a guide section. The inlet is located at one end of the air intake section, the other end of the air intake section is connected to the guide section through the connecting section, and the outlet is located at the end of the guide section away from the connecting section.

[0013] Wherein, along the first direction, the height of the air intake and the connecting portion are coaxial and at the same height; and / or, along the first direction, the guide portion extends away from the connecting portion, so that the outlet is lower than the connecting portion.

[0014] In some embodiments, there are two air intakes and two air filters, with one end of each air intake connected to one of the two air filters and the other end connected to the connecting part.

[0015] In some implementations, it also includes:

[0016] A transition pipe, through which the air outlet is connected to the high-temperature section;

[0017] Wherein, the diameter of the transition tube gradually increases from the air outlet to the high-temperature section; and / or, the inclination angle of the inner wall surface of the transition tube is ≤15°; and / or, the diameter of the transition tube is ≥1.2 times the diameter of the air outlet.

[0018] In some implementations, it also includes:

[0019] A flange is fitted over the outside of the transition pipe and connected to the engine;

[0020] A retaining ring is fitted around the outside of the transition pipe and positioned between the transition pipe and the flange.

[0021] In some embodiments, along the first direction, the connection position between the high-temperature section and the air outlet is lower than the connection position between the low-temperature section and the silencer;

[0022] And / or, along the first direction, the connection position between the high-temperature part and the air outlet is flush with the connection position between the low-temperature part and the high-temperature part.

[0023] In some embodiments, the low-temperature section includes a first low-temperature section and a second low-temperature section, one end of the first low-temperature section is connected to the end of the high-temperature section away from the air outlet, and the other end of the first low-temperature section is connected to the muffler through the second low-temperature section;

[0024] The first low-temperature section and the second low-temperature section are arranged at an angle, so that a clearance space is formed between the first low-temperature section and the second low-temperature section.

[0025] In some embodiments, the roughness of the inner wall of the intake pipe is ≤0.4μm;

[0026] And / or, the roughness of the inner wall of the outlet pipe is ≤0.4μm;

[0027] And / or, the boundary layer thickness of the intake pipe is 0.1 mm to 0.3 mm;

[0028] And / or, the boundary layer thickness of the exhaust pipe is 0.1mm to 0.3mm.

[0029] According to a second aspect of the present invention, an embodiment of the present invention also provides a dump truck, including the above-described dump truck intake and exhaust system.

[0030] One embodiment of this utility model has the following advantages or beneficial effects:

[0031] The dump truck intake and exhaust system provided in this embodiment, by setting the inlet higher than the outlet, creates a natural airflow direction. Utilizing gravity-assisted intake reduces resistance during the intake process, resulting in smoother airflow and ensuring the engine receives sufficient and stable air volume. This, in turn, improves engine combustion efficiency and performance. The larger diameter high-temperature section reduces the initial flow velocity of high-temperature exhaust gases, decreasing exhaust back pressure and ensuring smoother exhaust flow. This avoids problems such as power loss and increased fuel consumption caused by poor exhaust, and also helps extend engine lifespan.

[0032] This embodiment provides a dump truck that, by employing the aforementioned intake and exhaust system, can significantly improve the engine's intake and exhaust efficiency, optimize the engine's combustion process, and thereby enhance the engine's power performance, fuel economy, and reliability. Simultaneously, a well-designed intake and exhaust system helps reduce noise and exhaust emissions during vehicle operation, improves the vehicle's overall performance and environmental performance, and enhances the dump truck's operational capability and stability under harsh conditions. Attached Figure Description

[0033] To better understand this invention, reference can be made to the embodiments shown in the following drawings. Components in the drawings are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this invention. Furthermore, related elements or components may have different arrangements as known in the art. Additionally, in the drawings, the same reference numerals denote the same or similar components in various figures. The above and other features and advantages of this invention will become more apparent by describing exemplary embodiments of the invention in detail with reference to the drawings.

[0034] in:

[0035] Figure 1The diagram shown is a structural schematic of the intake and exhaust system of a dump truck according to an embodiment of the present invention;

[0036] Figure 2 The diagram shown is a structural schematic of the intake pipe and air filter in the intake and exhaust system of a dump truck according to an embodiment of the present invention.

[0037] Figure 3 The diagram shown is a structural schematic of the exhaust pipe and muffler in the intake and exhaust system of a dump truck according to an embodiment of the present invention.

[0038] Figure 4 The diagram shown is a structural schematic of the exhaust pipe and transition pipe in the intake and exhaust system of a dump truck according to an embodiment of the present invention.

[0039] Figure 5 The diagram shown is a structural schematic of the flange and retaining ring in the intake and exhaust system of a dump truck according to an embodiment of the present invention.

[0040] The reference numerals in the attached figures are explained as follows:

[0041] 100. Fixed frame; 101. Horizontal bar; 102. Vertical bar;

[0042] 1. Engine; 2. Intake pipe; 3. Air filter; 4. Exit pipe; 5. Muffler; 6. Transition pipe; 7. Flange; 8. Retaining ring;

[0043] 11. Air inlet; 12. Air outlet;

[0044] 21. Air intake section; 211. Inlet; 22. Connecting section; 23. Guide section; 231. Outlet;

[0045] 41. High-temperature section; 42. Low-temperature section; 420. Clearance space; 421. First low-temperature section; 422. Second low-temperature section. Detailed Implementation

[0046] The technical solutions of the exemplary embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this utility model.

[0047] In the description of this utility model, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the / described" object or "an" object are also intended to indicate one of a possible plurality of such objects.

[0048] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] Furthermore, in the description of this utility model, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this utility model are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this utility model. It should also be understood that, in the context, when an element or feature is mentioned as being "upper," "lower," "inner," or "outer" of another element (one or more), it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or it can be indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0050] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0051] This embodiment provides an intake and exhaust system for a dump truck, such as... Figure 1 As shown, the intake and exhaust system of the dump truck includes an engine 1, an intake system, and an exhaust system. The intake system includes an intake pipe 2 and an air filter 3. The exhaust system includes an exhaust pipe 4 and a muffler 5. The engine 1 is provided with an intake port 11 and an exhaust port 12. The intake pipe 2 is provided with an inlet 211 and an outlet 231. The inlet 211 is connected to the air filter 3, and the outlet 231 is connected to the intake port 11 of the engine 1. The exhaust port 12 of the engine 1 is connected to the muffler 5 through the exhaust pipe 4.

[0052] For example, the air introduced by the inlet 211 is filtered by the air filter 3 and enters the air intake 11 of the engine 1 through the air intake pipe 2. The exhaust gas formed after combustion in the engine 1 is discharged from the air outlet 12 and transported to the muffler 5 through the air outlet pipe 4. The exhaust gas is discharged into the atmosphere after being silenced by the muffler 5.

[0053] Among them, engine 1 has at least one reference plane, which is parallel to the horizontal plane. The first direction is perpendicular to the reference plane, and the second direction and the third direction are two mutually perpendicular directions within the reference plane. The first direction, the second direction and the third direction are mutually perpendicular to each other. The first direction is identified by D1, the second direction is identified by D2, and the third direction is identified by D3.

[0054] Since dump trucks generally operate in harsh working environments such as mining areas, the air entering the dump truck's intake and exhaust systems contains a certain amount of dust, which can easily lead to poor airflow and significant pressure loss in the dump truck's intake and exhaust systems.

[0055] Therefore, such as Figures 1-2 As shown, in the dump truck intake and exhaust system provided in this embodiment, along the first direction, the inlet 211 of the intake pipe 2 is higher than the outlet 231.

[0056] By setting the inlet 211 higher than the outlet 231, a natural airflow is formed, and gravity assists the intake, reducing resistance during the intake process and making the intake smoother. This ensures that the engine 1 can obtain a sufficient and stable intake volume, thereby improving the combustion efficiency and performance of the engine 1.

[0057] In one embodiment, along the first direction, the height difference h between the central axis of the inlet 211 and the central axis of the outlet 231 is 390mm to 410mm, for example, 390mm, 400mm, or 410mm, with 400mm being the preferred height difference.

[0058] This setup ensures effective natural air intake assistance without causing difficulties in the layout of the intake pipe due to excessive height difference. It better balances intake efficiency and actual installation requirements, maximizing the intake effect.

[0059] In one embodiment, such as Figures 1-2 As shown, the intake pipe 2 includes an intake section 21, a connecting section 22, and a guide section 23, wherein the diameter R of the guide section 23 is approximately 184 mm. An inlet 211 is located at one end of the intake section 21, and the other end of the intake section 21 is connected to the guide section 23 through the connecting section 22. An outlet 231 is located at the end of the guide section 23 away from the connecting section 22.

[0060] Along the first direction, the height of the air intake section 21 and the connecting section 22 are coaxial and at the same height, so that the gas flows smoothly in the section of the pipeline between the air intake section 21 and the connecting section 22, reducing airflow turbulence and resistance caused by abrupt changes in pipeline structure.

[0061] In this configuration, along the first direction, the guide portion 23 extends away from the connecting portion 22, making the outlet 231 lower than the connecting portion 22. This arrangement further utilizes gravity and airflow inertia to facilitate the smooth flow of air from the connecting portion 22 through the guide portion 23 to the air intake 11 of the engine 1, thus optimizing the airflow direction within the intake pipe 2 and improving intake efficiency.

[0062] The air intake section 21 and the connecting section 22 are smoothly transitioned by an arc, and the connecting section 22 and the guide section 23 are also smoothly transitioned by an arc. The multi-segment optimized design reduces the number of bends, increases the bend radius, and reduces airflow resistance. In addition, the use of a larger turning arc can reduce gas flow resistance.

[0063] The total resistance of the entire intake system consists of two parts: the resistance generated by the air filter 3 and the resistance generated by the intake pipe 2. The pressure drop of the intake pipe 2 is approximately 1146.69 Pa, and the pressure drop of the air filter 3 is approximately 2.6 kPa. Therefore, the pressure drop of the intake system P = 1.15 kPa + 2.6 kPa = 3.75 kPa < 6.0 kPa, which meets the intake requirements.

[0064] In one embodiment, there are two air intakes 21 and two air filters 3. One end of each air intake 21 is connected to one of the two air filters 3, and the other end is connected to the connecting part 22.

[0065] By setting two air intakes 21 and two air filters 3, the total air intake area is increased, which can filter more air into the engine 1 per unit time, meet the demand of the engine 1 for a large amount of clean air under high load conditions, further improve the power performance of the engine 1, and at the same time, to a certain extent, share the filtration pressure of each air filter 3 and extend the service life of the air filter 3.

[0066] In the existing exhaust system, airflow is prone to generate vortices between engine 1 and exhaust pipe 4, which leads to increased exhaust pressure loss and affects the exhaust efficiency of engine 1.

[0067] Therefore, such as Figure 1 and Figure 3 As shown, the exhaust pipe 4 provided in this embodiment includes a high-temperature section 41 and a low-temperature section 42. The exhaust port 12 of the engine 1 is connected to the high-temperature section 41, and the high-temperature section 41 is connected to the muffler 5 through the low-temperature section 42. The diameter of the high-temperature section 41 is larger than the diameter of the exhaust port 12.

[0068] In this way, the high-temperature section 41 with a larger diameter can reduce the flow rate of high-temperature exhaust gas in the initial stage of discharge, reduce exhaust back pressure, make the exhaust of engine 1 smoother, avoid problems such as power reduction and increased fuel consumption caused by poor exhaust, and also help extend the service life of engine 1.

[0069] In one embodiment, such as Figures 3-4 As shown, the intake and exhaust system of the dump truck also includes a transition pipe 6, through which the exhaust port 12 is connected to the high-temperature section 41. The diameter of the transition pipe 6 gradually increases from the exhaust port 12 to the high-temperature section 41, which effectively slows down the flow rate of exhaust gas, reduces exhaust back pressure, and makes exhaust smoother.

[0070] For example, the inclination angle of the inner wall surface of the transition pipe 6 is ≤15°, such as 10° or 15°, which can reduce the flow resistance of exhaust gas in the transition pipe 6, avoid the formation of turbulence, and improve the smoothness of exhaust.

[0071] For example, the diameter of the transition pipe 6 is ≥ 1.2 times the diameter of the outlet 12, providing a sufficient flow passage for exhaust gas, further ensuring smooth exhaust, reducing the extra burden on the engine 1 caused by poor exhaust, and improving the reliability and durability of the engine 1.

[0072] For example, the inner wall roughness Ra of the transition tube 6 is ≤0.8μm to reduce the occurrence of turbulence.

[0073] In one embodiment, such as Figures 3-5 As shown, the intake and exhaust system of the dump truck also includes a flange 7, which is sleeved on the outside of the transition pipe 6 and connected to the engine 1. The flange 7 serves to secure the connection and seal the system to prevent exhaust gas leakage.

[0074] The dump truck's intake and exhaust system also includes a retaining ring 8, which is fitted over the outside of the transition pipe 6 and positioned between the transition pipe 6 and the flange 7. This arrangement enhances the sealing effect and, to a certain extent, protects the transition pipe 6, preventing damage caused by stress concentration at the connection point and improving the stability and reliability of the entire exhaust connection.

[0075] In one embodiment, along the first direction, the connection position between the high-temperature section 41 and the air outlet 12 is lower than the connection position between the low-temperature section 42 and the silencer 5, which facilitates the flow of exhaust gas in the pipeline and reduces the accumulation of exhaust gas in the pipeline.

[0076] In particular, along the first direction, the connection position between the high-temperature section 41 and the outlet 12 is flush with the connection position between the low-temperature section 42 and the high-temperature section 41, which helps to maintain the flow stability of the exhaust gas throughout the exhaust process, reduce airflow turbulence caused by changes in pipeline height, and improve exhaust efficiency.

[0077] In one embodiment, the low-temperature section 42 includes a first low-temperature section 421 and a second low-temperature section 422. One end of the first low-temperature section 421 is connected to the end of the high-temperature section 41 away from the air outlet 12, and the other end of the first low-temperature section 421 is connected to the silencer 5 through the second low-temperature section 422.

[0078] The first low-temperature section 421 and the second low-temperature section 422 are arranged at an angle, forming a clearance space 420 between them. This arrangement effectively avoids interference with other components of the dump truck, facilitates the rational layout of the exhaust system within the limited vehicle space, and the bent structure also helps to slow down the exhaust gas flow speed, further promoting exhaust gas cooling and improving the noise reduction effect of the muffler 5.

[0079] For example, the dump truck also includes a fixing frame 100 for fixing and installing the vent pipe 4. Specifically, the fixing frame 100 includes a plurality of horizontal bars 101 and a plurality of vertical bars 102. The plurality of horizontal bars 101 are arranged in parallel at intervals, and the plurality of vertical bars 102 are arranged in parallel at intervals and located between adjacent horizontal bars 101. The horizontal bars 101 and vertical bars 102 are arranged perpendicular to each other. The connection between the high-temperature part 41 and the first low-temperature part 421 can be fixed by one of the vertical bars 102, and the connection between the first low-temperature part 421 and the second low-temperature part 422 can be fixed by the other vertical bar 102.

[0080] In one embodiment, the inner wall roughness of the intake pipe 2 is ≤0.4μm; and / or, the inner wall roughness of the exhaust pipe 4 is ≤0.4μm. This configuration can significantly reduce the friction between the gas and the pipe wall when the gas flows in the pipe, reduce energy loss, and improve the efficiency of intake and exhaust.

[0081] The boundary layer is a velocity gradient layer formed by the viscous force when the fluid flows through the intake pipe 2 and the inner wall of the pipe. The boundary layer thickness of the intake pipe 2 and / or the exhaust pipe 4 is 0.1mm to 0.3mm. For example, the boundary layer thickness can be selected as 0.1mm, 0.2mm, or 0.3mm. The boundary layer thickness can be reduced by grinding the inner wall of the pipe. A thinner boundary layer can make the gas closer to the ideal laminar flow state, increase the airflow velocity, reduce airflow turbulence and energy loss, further ensure smooth intake, and improve the performance of engine 1.

[0082] It should be noted that the total resistance of the entire exhaust system consists of two parts: one part is the resistance P1 generated by the exhaust pipe 4, and the other part is the back pressure loss resistance P2 generated by the muffler 5, where P2 = 1.142 kPa.

[0083] The dump truck intake and exhaust system provided in this embodiment uses fluid simulation software to simulate airflow distribution, optimize the layout of the intake pipe 2 and exhaust pipe 4, reduce airflow resistance and pressure loss, ensure sufficient air intake to meet actual usage requirements, and improve the performance and reliability of engine 1. Simultaneously, based on the intake and exhaust parameters of engine 1, an air filter 3 and muffler 5 are initially selected. The appropriately selected muffler 5 and optimized exhaust pipe 4 effectively reduce noise. The appropriately selected air filter 3 can reduce the frequency of clogging, reduce maintenance frequency, and also reduce engine 1 wear, extending its service life.

[0084] This embodiment provides a dump truck, including the above-described dump truck intake and exhaust system.

[0085] This embodiment provides a dump truck. Employing the aforementioned intake and exhaust system significantly improves the intake and exhaust efficiency of engine 1, optimizes the combustion process of engine 1, and thus enhances the power performance, fuel economy, and reliability of engine 1. Simultaneously, a well-designed intake and exhaust system helps reduce noise and exhaust emissions during vehicle operation, improves the overall performance and environmental performance of the vehicle, and enhances the dump truck's operational capability and stability under harsh conditions.

[0086] It should be noted that the embodiments of this utility model are merely one example of the principles employed by the present utility model, as shown in the accompanying drawings and described herein. Those skilled in the art will clearly understand that the principles of this utility model are not limited to any details or components of the apparatus shown in the accompanying drawings or described in the specification.

[0087] It should be understood that this invention is not limited to the detailed structure and arrangement of the components described herein. This invention can have other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this invention. It should be understood that the invention disclosed and defined herein extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of this invention. The embodiments described in this specification illustrate the best known mode for implementing this invention and will enable those skilled in the art to utilize this invention.

[0088] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered as exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

[0089] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this utility model is limited only by the appended claims.

Claims

1. A dump truck intake and exhaust system, characterized in that, include: An engine, the engine being provided with an air inlet and an air outlet; An intake pipe and an air filter, wherein the intake pipe is provided with an inlet and an outlet, the inlet is connected to the air filter, and the outlet is connected to the air intake port of the engine; An exhaust pipe and a muffler, wherein the exhaust pipe includes a high-temperature section and a low-temperature section, the exhaust port of the engine is connected to the high-temperature section, and the high-temperature section is connected to the muffler through the low-temperature section; Wherein, along the first direction, the inlet is higher than the outlet; and / or, the diameter of the high-temperature section is larger than the diameter of the air outlet.

2. The intake and exhaust system for a dump truck according to claim 1, characterized in that, Along the first direction, the height difference between the central axis of the inlet and the central axis of the outlet is 390mm to 410mm.

3. The intake and exhaust system for a dump truck according to claim 1, characterized in that, The air intake pipe includes an air intake section, a connecting section, and a guide section. The inlet is located at one end of the air intake section, and the other end of the air intake section is connected to the guide section through the connecting section. The outlet is located at the end of the guide section away from the connecting section. Wherein, along the first direction, the height of the air intake and the connecting portion are coaxial and at the same height; and / or, along the first direction, the guide portion extends away from the connecting portion, so that the outlet is lower than the connecting portion.

4. The intake and exhaust system for a dump truck according to claim 3, characterized in that, The number of air intakes and air filters is two. One end of each air intake is connected to one of the two air filters, and the other end is connected to the connecting part.

5. The intake and exhaust system for a dump truck according to claim 1, characterized in that, Also includes: A transition pipe, through which the air outlet is connected to the high-temperature section; Wherein, the diameter of the transition tube gradually increases from the air outlet to the high-temperature section; and / or, the inclination angle of the inner wall surface of the transition tube is ≤15°; and / or, the diameter of the transition tube is ≥1.2 times the diameter of the air outlet.

6. The dump truck intake and exhaust system according to claim 5, characterized in that, Also includes: A flange is fitted over the outside of the transition pipe and connected to the engine; A retaining ring is fitted over the outside of the transition pipe and positioned between the transition pipe and the flange.

7. The intake and exhaust system for a dump truck according to claim 1, characterized in that, Along the first direction, the connection position between the high-temperature section and the air outlet is lower than the connection position between the low-temperature section and the silencer; And / or, along the first direction, the connection position between the high-temperature part and the air outlet is flush with the connection position between the low-temperature part and the high-temperature part.

8. The intake and exhaust system for a dump truck according to claim 1, characterized in that, The low-temperature section includes a first low-temperature section and a second low-temperature section. One end of the first low-temperature section is connected to the end of the high-temperature section away from the air outlet, and the other end of the first low-temperature section is connected to the muffler through the second low-temperature section. The first low-temperature section and the second low-temperature section are arranged at an angle, so that a clearance space is formed between the first low-temperature section and the second low-temperature section.

9. The intake and exhaust system for a dump truck according to any one of claims 1-8, characterized in that, The inner wall roughness of the intake pipe is ≤0.4μm; And / or, the roughness of the inner wall of the outlet pipe is ≤0.4μm; And / or, the boundary layer thickness of the intake pipe is 0.1 mm to 0.3 mm; And / or, the boundary layer thickness of the exhaust pipe is 0.1mm to 0.3mm.

10. A dump truck, characterized in that, Includes the dump truck intake and exhaust system as described in any one of claims 1-9.

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