Engineering machinery engine exhaust pipe assembly and exhaust system

Abstract

The utility model discloses an engineering machinery engine exhaust pipe assembly and an exhaust system, and belongs to the technical field of engineering machinery exhaust, the engineering machinery engine exhaust pipe assembly comprises a first connecting pipe section used for connecting an engine, and a first corrugated section is formed in the middle of the first connecting pipe section; the second connecting pipe section is used for being connected with the postprocessor, the second connecting pipe section is communicated with the first connecting pipe section, and a second corrugated section is formed in the middle of the second connecting pipe section; the connecting plate is used for being connected to a frame, and the connecting plate is welded between the first corrugated section and the second corrugated section; wherein the first connecting pipe section and the second connecting pipe section are integrally formed. The problem that the structural strength of the engineering machinery engine exhaust pipe is insufficient is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of exhaust technology for engineering machinery, and more specifically, to an exhaust pipe assembly and exhaust system for an engineering machinery engine. Background Technology

[0002] As an indispensable type of specialized machinery, construction machinery plays a wide role in all aspects of modern infrastructure construction, mainly involving national defense construction, transportation construction, energy industry construction, mining, agriculture, forestry and water conservancy construction, urban construction, and building construction.

[0003] The main power source for construction machinery is diesel engines. With the increasing number of construction machinery in operation, diesel engines are causing increasingly serious environmental pollution. In response to policy and development requirements, the state has promulgated the latest emission regulations - "Emission Limits and Measurement Methods for Exhaust Pollutants from Diesel Engines for Non-Road Mobile Machinery (China Stage III and IV)" (GB20891-2014).

[0004] In response to the new emission regulations, major engine manufacturers have developed their own emission technology roadmaps based on their technological and product characteristics. Compared to non-road Euro III engines, these engines require an additional exhaust aftertreatment system, mainly including a urea pump, urea tank, water shut-off solenoid valve, and aftertreatment unit. The aftertreatment unit is the core component of the aftertreatment system. The aftertreatment unit can be integrated into the engine block or installed separately, with the OEM responsible for its placement and installation. Regardless of the installation method, the engine block and the aftertreatment unit must be connected via a metal bellows to ensure smooth entry of engine exhaust gases into the aftertreatment unit, making it a crucial component of the entire aftertreatment system.

[0005] For example, Chinese patent document (publication number: CN 217841801 U) provides a heat-insulated exhaust pipe and an automobile, which includes: a first double-layer pipe, which includes a first inner pipe and a first outer pipe, the first outer pipe being sleeved outside the first inner pipe, and a first heat-insulating gap between the first outer pipe and the first inner pipe; a second double-layer pipe, which includes a second inner pipe and a second outer pipe, the second outer pipe being sleeved outside the second inner pipe, and a second heat-insulating gap between the second outer pipe and the second inner pipe; a corrugated pipe, one end of which is connected to one end of the first inner pipe, and the other end of which is connected to one end of the second inner pipe.

[0006] The exhaust pipe in the above application can enhance the stability of the connection to a certain extent. However, it can only be used on ordinary road vehicles. When the exhaust pipe is used in engineering machinery such as rock drilling rigs, it often faces harsh environments such as high vibration, high dust, high noise, high temperature, and low temperature. Under these conditions, the structural strength of the existing engine exhaust pipe is difficult to meet the usage requirements.

[0007] The relevant technologies do not provide effective solutions to the above problems. Utility Model Content

[0008] To address potential problems in related technologies, some embodiments of this application provide an exhaust pipe assembly for an engineering machinery engine, comprising: a first connecting pipe section for connecting to an engine, wherein a first corrugated section is formed in the middle of the first connecting pipe section; a second connecting pipe section for connecting to an after-processor, wherein the second connecting pipe section communicates with the first connecting pipe section, and a second corrugated section is formed in the middle of the second connecting pipe section; and a connecting plate for connecting to a vehicle frame, wherein the connecting plate is welded between the first corrugated section and the second corrugated section; wherein the first connecting pipe section and the second connecting pipe section are integrally formed.

[0009] Furthermore, the portion where the first connecting pipe section connects to the second connecting pipe section forms a bend, and the connecting plate is welded to the bend.

[0010] Furthermore, both the first corrugated segment and the second corrugated segment have an elastic insulation layer on their outer surface, and the inner diameter of the two elastic insulation layers can expand or shrink as the first corrugated segment and the second corrugated segment expand or shrink respectively.

[0011] Furthermore, a first connecting part is welded to the end of the first connecting pipe segment away from the second connecting pipe segment for engaging with the engine's air outlet; a second connecting part is welded to the end of the second connecting pipe segment away from the first connecting pipe segment for engaging with the aftertreatment unit's air inlet.

[0012] Furthermore, the first connecting pipe segment also includes a first reinforcing pipe, which is located between the first corrugated segment and the first connecting portion; the second connecting pipe segment also includes a second reinforcing pipe, which is located between the second corrugated segment and the second connecting portion.

[0013] Furthermore, within the first and second connecting pipe sections, the areas outside the first and second corrugated sections are fitted with rigid insulation sleeves. The rigid insulation sleeves consist of an inner layer and an outer layer, the inner layer being a thermal insulation medium and the outer layer being a rigid material.

[0014] Furthermore, the length of the first corrugated segment is greater than that of the second corrugated segment.

[0015] Furthermore, the thickness of the connecting plate is greater than the thickness of the first connecting pipe segment and the second connecting pipe segment.

[0016] Furthermore, the thickness of the first connecting pipe section and the second connecting pipe is 1.8 mm to 2.3 mm.

[0017] To achieve the above objectives, this application also provides an exhaust system for construction machinery, including an exhaust pipe assembly for a construction machinery engine as described in any of the above solutions, and further including an engine and an after-processor, wherein the exhaust pipe assembly for the construction machinery engine is connected between the engine and the after-processor.

[0018] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0019] Because both the first and second connecting pipe sections are equipped with corrugated pipes, they are more suitable for the working conditions of construction machinery. The first and second connecting pipe sections are integrally formed, greatly reducing the number of connection points between them and improving the overall vibration resistance. Furthermore, the first and second connecting pipe sections are connected and supported to the frame by a welded rigid connecting plate. To a certain extent, this connecting plate "separates" the first and second connecting pipe sections. The vibration amplitudes of the engine and the after-processor are quite different. The first corrugated section in the first connecting pipe section is used to absorb the vibration force of the engine, and the second corrugated section in the second connecting pipe section is used to absorb the vibration force of the after-processor. Not only is the vibration force on the connecting plate reduced, but the two corrugated pipe sections in the exhaust pipe assembly of the construction machinery engine vibrate independently relative to the frame through the intermediate connecting plate, greatly reducing the superposition of vibration effects and avoiding the generation of unnecessary internal vibration stress, thus greatly extending the service life of the exhaust pipe. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the exhaust pipe assembly structure of an engineering machinery engine according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the exploded structure of an exhaust pipe assembly for an engineering machinery engine according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the exhaust pipe assembly structure of an engineering machinery engine according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of an exhaust system for engineering machinery according to an embodiment of this application;

[0025] Label Explanation:

[0026] 100. First connecting pipe section; 110. First corrugated section; 120. First connecting part; 130. First reinforcing pipe;

[0027] 200. Second connecting pipe section; 210. Second corrugated section; 220. Second connecting part; 221. Transition part; 230. Second reinforcing pipe;

[0028] 300. Connecting plate;

[0029] 400. Elastic insulation layer;

[0030] 500. Rigid insulation sleeve;

[0031] 600, Engine;

[0032] 700, Post-processor. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0035] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0036] like Figures 1 to 4 As shown, this application provides an exhaust pipe assembly for an engineering machinery engine, which is mainly used in engineering machinery, such as excavators, drilling rigs, loaders, etc., to be suitable for harsh working environments.

[0037] like Figure 1 As shown, the exhaust pipe assembly of the construction machinery engine includes a first connecting pipe section 100, a second connecting pipe section 200, and a connecting plate 300.

[0038] A first connecting pipe section 100 is used to connect to the engine 600, and a first corrugated section 110 is formed in the middle of the first connecting pipe section 100. A second connecting pipe section 200 is used to connect to the aftertreatment unit 700, and the second connecting pipe section 200 communicates with the first connecting pipe section 100, and a second corrugated section 210 is formed in the middle of the second connecting pipe section 200. A connecting plate 300 is used to connect to the frame connecting plate 300 and welded between the first corrugated section 110 and the second corrugated section 210. The first connecting pipe section 100 and the second connecting pipe section 200 are integrally formed.

[0039] The first connecting pipe section 100 can be directly or indirectly connected to the engine 600, and the second connecting pipe section 200 can be directly or indirectly connected to the after-treatment unit 700.

[0040] In this way, since both the first connecting pipe section 100 and the second connecting pipe section 200 are equipped with corrugated pipes, it is more in line with the working conditions of construction machinery. The first connecting pipe section 100 and the second connecting pipe are integrally formed, greatly reducing the connection points between them and improving the overall shock resistance. Moreover, the first connecting pipe section 100 and the second connecting pipe are connected and supported to the frame by a welded rigid connecting plate 300. To a certain extent, the connecting plate 300 "separates" the first connecting pipe section 100 and the second connecting pipe section 200. The amplitudes of the engine 600 and the after-processor 700 are significantly different. The first corrugated section 110 in the first connecting pipe section 100 is used to absorb the vibration force of the engine 600, and the second corrugated section 210 in the second connecting pipe section 200 is used to absorb the vibration force of the after-processor 700. Not only is the vibration force on the connecting plate 300 reduced, but the two corrugated pipes in the exhaust pipe assembly of the construction machinery engine vibrate independently relative to the frame through the middle connecting plate 300, greatly reducing the superposition of vibration effects, avoiding the generation of unnecessary internal vibration stress as much as possible, and greatly extending the service life of the exhaust pipe.

[0041] In the relevant technology, the exhaust pipe only has a section of corrugated pipe near the engine 600. This causes the rigid pipe of the aftertreatment unit 700 to transmit most of the force in the opposite direction to the only section of corrugated pipe when it encounters vibration, exceeding the load-bearing limit of the corrugated pipe and making the entire exhaust pipe more susceptible to damage.

[0042] If the connecting plate 300 is removed, the two sections of the bellows in the exhaust pipe will cause uneven stress inside the entire exhaust bellows. The area between the two bellows will also generate superimposed internal stress, making the exhaust pipe prone to damage.

[0043] Specifically, such as Figure 1 As shown, the portion where the first connecting pipe section 100 and the second connecting pipe section 200 are connected together forms a bend, and the connecting plate 300 is welded to the bend. This bend can be L-shaped or other shapes to fit different vehicle body structures.

[0044] Preferred, such as Figure 2 , 3 As shown, both the first corrugated section 110 and the second corrugated section 210 have an elastic insulation layer 400 on their outer layers. The first corrugated section 110 and the second corrugated section 210 will expand when exposed to high-temperature gas, and the inner diameter of the two elastic insulation layers 400 can expand or shrink with the first corrugated section 110 and the second corrugated section 210, respectively. Furthermore, since the elastic insulation layer 400 has a certain deformation capability, it can also adapt to different installation methods with the first corrugated section 110 and the second corrugated section 210.

[0045] As an optional solution, the elastic insulation layer 400 is insulation cotton, which is generally made of high-temperature resistant material and has springs and spring buckles on its surface. The spring buckles are fixed to the insulation cotton. When the insulation cotton is wrapped around the first corrugated section 110 and the second corrugated section 210, the springs pull the spring buckles to tighten and fix it, thus achieving the insulation effect of the corrugated section and the deformation capability of the elastic insulation layer 400.

[0046] Furthermore, such as Figure 1 As shown, the end of the first connecting pipe section 100 away from the second connecting pipe section 200 is welded with a first connecting part 120 for engaging with the air outlet of the engine 600. The end of the second connecting pipe section 200 away from the first connecting pipe section 100 is welded with a second connecting part 220 for engaging with the air inlet of the aftertreatment unit 700. Specifically, the above-mentioned "engagement" can be achieved by using a V-shaped clamp.

[0047] More specifically, such as Figure 1 As shown, since the first connecting pipe section 100 and the second connecting pipe section 200 are integrally formed, they are generally of equal diameter to consider manufacturing costs. However, the air inlet of the after-processor 700 may not be equal to the air outlet of the engine 600. Therefore, the first connecting part 120 or the second connecting part 220 may be formed with a transition part 221 for further expanding or reducing the diameter, so as to realize the connection with the first connecting pipe section 100 and the second connecting pipe section 200.

[0048] Furthermore, such as Figure 1As shown, the first connecting pipe section 100 further includes a first reinforcing pipe 130, which is located between the first corrugated section 110 and the first connecting portion 120. The second connecting pipe section 200 further includes a second reinforcing pipe 230, which is located between the second corrugated section 210 and the second connecting portion 220. This reinforcing pipe is used to increase the stability of the connection between the pipe body and the engine 600 or the after-treatment system 700, and to strengthen its own strength.

[0049] In detail, the first reinforcing tube 130 is integrally formed with the first corrugated section 110, and the second reinforcing tube 230 is integrally formed with the second corrugated section 210.

[0050] Preferred, such as Figure 2 As shown, within the first connecting pipe section 100 and the second connecting pipe section 200, the areas outside the first corrugated section 110 and the second corrugated section 210 are all fitted with rigid insulation sleeves 500. The rigid insulation sleeve 500 comprises an inner layer and an outer layer; the inner layer is a thermal insulation medium, and the outer layer is a rigid material. This thermal insulation medium can be rock wool, glass wool, expanded perlite, or foamed plastic insulation materials (such as EPS, XPS, PUF, PET, etc.).

[0051] Specifically, such as Figure 2 As shown, the areas outside the first corrugated section 110 and the second corrugated section 210 within the first connecting pipe section 100 and the second connecting pipe section 200, specifically the bend formed by the first corrugated section 110 and the second corrugated section 210, as well as the first reinforcing section and the second reinforcing section, are all fitted with rigid insulation sleeves 500. This ensures that the first connecting pipe section 100 and the second connecting pipe section 200 are fully insulated, preventing heat from dissipating to the outside and reducing the possibility of thermal damage to other components inside the vehicle. The after-processor 700 can also more efficiently utilize the high temperature of the gas for conversion.

[0052] Preferred, such as Figure 1 As shown, the length of the first corrugated section 110 is greater than that of the second corrugated section 210. Considering that the first corrugated section 110 is close to the engine 600 and the vibration amplitude of the engine 600 is greater, this embodiment further extends the length of the first corrugated section 110 to alleviate more vibration, thereby reducing the damage to the pipe structure in the first step.

[0053] Specifically, the thickness of the connecting plate 300 is greater than the thickness of the first connecting pipe section 100 and the second connecting pipe section 200, in order to increase the load-bearing strength of the connecting plate 300.

[0054] Furthermore, the thickness of the first connecting pipe section 100 and the second connecting pipe is 1.8mm to 2.3mm, such as 1.9mm, 2mm, 2.1mm or 2.5mm, which makes the pipe structure lightweight and avoids causing large bending moments or tensile forces at the connection points of the engine 600 and the aftertreatment, thus preventing damage to the interfaces.

[0055] As a specific embodiment, such as Figure 4 As shown, this application also provides an exhaust system for construction machinery, which further includes an engine 600 and an after-processor 700. An exhaust pipe assembly for the construction machinery engine is connected between the engine 600 and the after-processor 700. This exhaust pipe assembly for the construction machinery engine can further improve the working efficiency of the exhaust system.

[0056] In this application, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An exhaust pipe assembly for an engineering machinery engine, characterized in that, include: A first connecting pipe section is used to connect to the engine, and a first corrugated section is formed in the middle of the first connecting pipe section; The second connecting pipe section is used to connect to the post-processor. The second connecting pipe section is connected to the first connecting pipe section, and a second corrugated section is formed in the middle of the second connecting pipe section. A connecting plate for connecting to the frame, the connecting plate being welded between the first corrugated section and the second corrugated section; The first connecting pipe section and the second connecting pipe section are integrally formed.

2. The exhaust pipe assembly for an engineering machinery engine according to claim 1, characterized in that: The portion where the first connecting pipe section and the second connecting pipe section are connected forms a bend, and the connecting plate is welded to the bend.

3. The exhaust pipe assembly for an engineering machinery engine according to claim 1, characterized in that: Both the first corrugated section and the second corrugated section have an elastic insulation layer on their outer surface, and the inner diameter of the two elastic insulation layers can expand or shrink as the first corrugated section and the second corrugated section expand or shrink respectively.

4. The exhaust pipe assembly for an engineering machinery engine according to claim 1, characterized in that: The first connecting pipe section has a first connecting part welded to the end away from the second connecting pipe section, which is used to engage with the engine's exhaust port; The second connecting pipe section has a second connecting part welded to the end away from the first connecting pipe section, which is used to engage with the air inlet of the post-processor.

5. The exhaust pipe assembly for an engineering machinery engine according to claim 4, characterized in that: The first connecting pipe section further includes a first reinforcing pipe, which is located between the first corrugated section and the first connecting portion; The second connecting pipe section also includes a second reinforcing pipe, and the first reinforcing pipe is located between the second corrugated section and the second connecting part.

6. The exhaust pipe assembly for an engineering machinery engine according to claim 5, characterized in that: Within the first and second connecting pipe sections, the areas outside the first and second corrugated sections are all fitted with rigid insulation sleeves. The rigid insulation sleeves consist of an inner layer and an outer layer. The inner layer is a thermal insulation medium, and the outer layer is a rigid material.

7. An exhaust pipe assembly for an engineering machinery engine according to any one of claims 1 to 6, characterized in that: The length of the first corrugated segment is greater than that of the second corrugated segment.

8. The exhaust pipe assembly for an engineering machinery engine according to claim 7, characterized in that: The thickness of the connecting plate is greater than the thickness of the first connecting pipe section and the second connecting pipe section.

9. The exhaust pipe assembly for an engineering machinery engine according to claim 8, characterized in that: The thickness of the first connecting pipe section and the second connecting pipe is 1.8 mm to 2.3 mm.

10. An exhaust system for construction machinery, comprising the exhaust pipe assembly of a construction machinery engine as described in any one of claims 1 to 9, characterized in that: It also includes an engine and an after-processor, with the exhaust pipe assembly of the construction machinery engine connected between the engine and the after-processor.

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