Power cabin arrangement and working machine

Abstract

The present application relates to the technical field of engineering machinery, and particularly relates to a power cabin device and engineering machinery. The power cabin device comprises an engine, a machine cover which is arranged outside the engine, and an exhaust device which is communicated with an exhaust port of the engine and is used for discharging gas flowing out of the exhaust port to outside the machine cover. The exhaust device comprises an ejector pipe and an exhaust tail pipe which are arranged in sequence along an exhaust direction. The ejector pipe comprises a first pipe section and a second pipe section which are connected to each other. The first pipe section is connected with the exhaust port. The second pipe section is at least partially inserted into the exhaust tail pipe. An outlet end surface of the second pipe section comprises wave crest portions and wave trough portions which are connected in sequence and alternately in a circumferential direction. Based on this, the exhaust device not only has an ejecting function, but also has a function of strengthening fluid mixing, so that the cooling and noise reduction performance of the power cabin can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, and in particular relates to a power cabin device and engineering machinery. BACKGROUND

[0002] The power cabin of the engineering machinery is a semi-closed space, and an engine and an exhaust device are usually arranged inside the power cabin, and the exhaust device is used for exhausting the gas discharged by the engine to the outside of the power cabin.

[0003] The heat dissipation performance and the noise intensity are two important performance indexes of the power cabin, however, the two indexes are contradictory to each other, and how to give consideration to the two performances has been a technical problem.

[0004] In the related art, the pipeline of the exhaust device is generally circular in cross section, and a hole is opened on the bonnet to assist heat dissipation. SUMMARY

[0005] One of the technical problems to be solved by the present application is to improve the cooling and noise reduction performance of the power cabin.

[0006] In order to solve the above technical problem, the present application provides a power cabin device, which comprises:

[0007] an engine;

[0008] a bonnet arranged outside the engine; and

[0009] an exhaust device in communication with an exhaust port of the engine and used for exhausting the gas flowing out of the exhaust port to the outside of the bonnet, the exhaust device comprising an injection pipe and an exhaust tail pipe arranged in sequence along an exhaust direction, the injection pipe comprising a first pipe section and a second pipe section connected to each other, the first pipe section being connected with the exhaust port, the second pipe section being at least partially inserted into the exhaust tail pipe, and an outlet end surface of the second pipe section comprising wave crest portions and wave trough portions connected in sequence and alternately along a circumferential direction.

[0010] In some embodiments, the wave crest portions and / or the wave trough portions are arc-shaped.

[0011] In some embodiments, the wave crest portions and the wave trough portions are both arc-shaped, and the tangent lines of adjacent wave crest portions and wave trough portions coincide.

[0012] In some embodiments, the cross section of the second pipe section comprises wave crest portions and wave trough portions connected in sequence and alternately along the circumferential direction; and / or, the cross-sectional areas of the second pipe section are equal along the exhaust direction.

[0013] In some embodiments, a first opening is arranged on the pipe wall of the inlet end of the first pipe section.

[0014] In some embodiments, the number of the first openings is at least two, and the at least two first openings are arranged at intervals along the circumferential direction of the first pipe section.

[0015] In some embodiments, the exhaust tail pipe is located outside the cowling, and the exhaust device further comprises a connecting pipe arranged on the cowling, and the exhaust tail pipe is sleeved outside the connecting pipe.

[0016] In some embodiments, the exhaust tail pipe comprises a first tail pipe portion, a second tail pipe portion, a third tail pipe portion and a fourth tail pipe portion connected in sequence along the exhaust direction, the second pipe section is at least partially inserted into the first tail pipe portion, and the cross-sectional area of the second tail pipe portion gradually decreases along the exhaust direction.

[0017] In some embodiments, the fourth tail pipe portion is connected with the third tail pipe portion at an angle; and / or, the cross-sectional area of at least one of the first tail pipe portion, the third tail pipe portion and the fourth tail pipe portion is equal along the exhaust direction.

[0018] In some embodiments, a second opening is arranged on the pipe wall of the inlet end of the first tail pipe portion.

[0019] In some embodiments, the number of the second openings is at least two, and the at least two second openings are arranged at intervals along the circumference of the first tail pipe portion.

[0020] In some embodiments, the exhaust device further comprises a muffler connected between the exhaust port and the ejector pipe.

[0021] In some embodiments, the muffler is an impedance compound muffler.

[0022] In some embodiments, the power cabin device further comprises a fan, and the fan is located upstream of the engine along the exhaust direction, and the fan is a suction fan.

[0023] The application also provides an engineering machine comprising the power cabin device of the application.

[0024] By additionally arranging the ejector pipe, and setting the outlet shape of the ejector pipe as a curve shape with concave-convex alternation, the exhaust device not only has the function of ejecting, but also has the function of strengthening fluid mixing, so that the cooling and noise reduction performance of the power cabin can be effectively improved.

[0025] Other features and advantages of the application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or in the prior art, brief introduction will be given to the drawings needed to be used in the following embodiment descriptions and prior art descriptions. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 An external structure schematic diagram of the power cabin device of the present application is shown.

[0028] Figure 2 An internal structure schematic diagram of the power cabin device is shown. Figure 1 An internal structure schematic diagram of the power cabin device is shown.

[0029] Figure 3 A partial structure schematic diagram of the exhaust device is shown. Figure 2 A partial structure schematic diagram of the exhaust device is shown.

[0030] Figure 4 A perspective structure schematic diagram of the ejector pipe is shown. Figure 3 A perspective structure schematic diagram of the exhaust device is shown.

[0031] Figure 5 A right view of the exhaust device is shown. Figure 4 A right view of the exhaust device is shown.

[0032] Figure 6 A structure schematic diagram of the exhaust tail pipe is shown. Figure 3 A structure schematic diagram of the exhaust tail pipe is shown.

[0033] Figure 7 A gas flow state schematic diagram of the exhaust device in operation is shown. Figure 2 A gas flow state schematic diagram of the exhaust device in operation is shown.

[0034] In the figure:

[0035] 1, vehicle frame;

[0036] 2, hood;

[0037] 3, engine;

[0038] 4, exhaust device; 41, muffler; 42, ejector pipe; 421, first pipe section; 422, second pipe section; 422a, wave crest; 422b, wave trough; 422c, connecting section; 423, first opening; 43, connecting pipe; 44, exhaust tail pipe; 441, first tail pipe section; 442, second tail pipe section; 443, third tail pipe section; 444, fourth tail pipe section; 445, second opening;

[0039] 5, radiator; 6, fan. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without carrying out creative work are within the protection scope of the present application.

[0041] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the disclosure in appropriate circumstances.

[0042] In the description of the present application, it should be understood that the use of the words "first", "second", and the like, to describe various components, is merely intended to differentiate one component from another, and the above words should not be understood as having a special meaning unless otherwise stated, and therefore should not be understood as limiting the scope of protection of the present application.

[0043] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as they do not conflict with each other.

[0044] As a structure of the power cabin device, the power cabin is internally provided with an engine, a cooling system and an exhaust system. The exhaust system includes a muffler and an exhaust tail pipe, and the exhaust tail pipe is connected with the exhaust port of the engine through the muffler. The outlet end of the muffler is inserted into the exhaust tail pipe, and the outlet shape of the muffler is circular. The exhaust tail pipe extends into the engine cover through the mounting hole on the engine cover, and has a gap between the mounting hole. The cooling system includes a radiator and a fan, and the fan is arranged between the radiator and the engine, and the fan is a blowing fan.

[0045] The above power cabin device has the following problems:

[0046] (1) The outlet shape of the muffler is circular, mainly relying on the action of the shear force of the exhaust gas of the engine to suck the air in the power cabin and mix with it, without the function of enhancing the mixing of the fluid, the injection efficiency is low, and the accumulation of high-temperature gas in the power cabin is easy to cause, which affects the cooling and noise reduction effect, and increases the fuel consumption.

[0047] (2) There is a gap between the exhaust tail pipe and the mounting hole on the engine cover, which is not conducive to fluid injection and the exhaust noise is large.

[0048] (3) The fan is a blowing fan, which blows part of the hot gas flow in the power cabin to the radiator, which affects the heat dissipation performance of the radiator on the one hand, and is not conducive to the realization of the injection effect on the other hand.

[0049] (4) The injection efficiency is low, and a very long exhaust tail pipe is needed to realize the full mixing of the working fluid and the injection fluid. For engineering machinery, the longer exhaust tail pipe will cause higher pressure loss and increase the overall weight, affecting the economy of the whole vehicle, and also affecting the operator's view.

[0050] Based on the above research, the structure of the power cabin device is improved to improve the cooling effect of the power cabin device and reduce the noise of the power cabin device.

[0051] Figures 1-7 An embodiment of the power cabin device of the present application is shown.

[0052] With reference to Figures 1-7 The power cabin device provided by the present application comprises:

[0053] an engine 3;

[0054] a casing 2 arranged outside the engine 3; and

[0055] an exhaust device 4 in communication with an exhaust port 31 of the engine 3 and configured to exhaust the gas flowing out of the exhaust port 31 to the outside of the casing 2, the exhaust device 4 comprising an ejector pipe 42 and an exhaust tail pipe 44 arranged in sequence along an exhaust direction, the ejector pipe 42 comprising a first pipe section 421 and a second pipe section 422 connected to each other, the first pipe section 421 being connected to the exhaust port 31, the second pipe section 422 being at least partially inserted into the exhaust tail pipe 44, and an outlet end surface of the second pipe section 422 comprising wave crest portions 422a and wave trough portions 422b connected to each other in sequence along a circumferential direction.

[0056] Based on the above arrangement, the ejector pipe 42 and the exhaust tail pipe 44 cooperate to form an ejector, which plays an ejecting role and can strengthen fluid mixing during the ejecting process, effectively improve the ejecting efficiency, and improve the ejecting effect, so as to more fully reduce the temperature in the power cabin and reduce the noise intensity of the power cabin.

[0057] The ejecting role refers to a process of mixing different fluids with each other and causing energy exchange between different fluids by using the turbulent diffusion of a jet flow. Among them, the fluid with higher pressure is called working fluid, or main fluid. The fluid with lower pressure is called ejecting fluid, or secondary fluid. When the working fluid jet flows, the ejecting fluid around the working fluid is entrained, and the two fluids are mixed and exchange energy, so as to reduce the air flow velocity and air flow temperature, and play a role of ventilation and heat dissipation, and noise reduction.

[0058] In the present application, the working fluid is the engine exhaust flowing out of the ejector pipe 42, and the ejecting fluid is the air in the power cabin. The engine exhaust has high temperature and high pressure, and has a pressure difference with the surrounding gas when it flows out of the outlet of the ejector pipe 42. Therefore, the high-temperature air and dust in the power cabin are entrained and mixed with the high-temperature air and dust in the power cabin, and are discharged to the outside of the power cabin through the exhaust tail pipe 44, so as to realize the ejecting role.

[0059] At the same time, the negative pressure generated by the gas discharged through the exhaust tail pipe 44 can suck the fresh air from the outside of the power cabin through the partial apertures (the gaps between the bottom of the power cabin and the casing 2), so as to form a circulating air flow in the power cabin, and realize continuous ventilation and heat dissipation of the inside of the power cabin.

[0060] Furthermore, since the outlet shape of the ejector tube 42 is no longer circular but has been changed to a curved shape with crests 422a and troughs 422b, on the one hand, with the same outlet area, the outlet of the ejector tube 42 has a larger circumference, which can increase the interface area between the two fluids and increase the ejection boundary. On the other hand, the crests 422a and troughs 422b can guide the working fluid and the ejector fluid to flow in opposite directions at the outlet of the ejector tube 42, forming a reverse circulation between the two fluids. Therefore, the exhaust device 4 can not only play an ejection role, but also It can also enhance fluid mixing during the ejection process, allowing the two airflows to mix fully within a short axial distance after entering the exhaust tailpipe 44. This can improve ejection performance, reduce exhaust temperature and exhaust velocity more efficiently, and achieve better cooling and noise reduction. On the other hand, it can also reduce the length requirements of the exhaust tailpipe 44, so that the required mixing effect can be achieved with a shorter exhaust tailpipe 44, thereby reducing pressure loss, reducing vehicle weight, improving vehicle economy, and providing the operator with a wider field of vision.

[0061] Among them, reference Figures 4-5 The crest portion 422a is the portion that expands radially outward from the center of the outlet end face of the second pipe section 422, and the trough portion 422b is the portion that is recessed relative to the crest portion 422a towards the center of the outlet end face of the second pipe section 422. During ejection, the crest portion 422a guides the engine exhaust gas flowing out of the ejector tube 42 to flow radially outward from the ejector tube 42, while the trough portion 422b guides the ejected fluid outside the ejector tube 42 to flow radially inward from the ejector tube 42. This causes the two fluids to form a counter-current circulation at the outlet of the ejector tube 42, enhancing their mixing effect.

[0062] The crest portion 422a and the trough portion 422b can be constructed into various shapes such as rectangle, trapezoid, ellipse or circle. Furthermore, the shapes of the crest portion 422a and the trough portion 422b can be the same or different.

[0063] Additionally, refer to Figure 1 and Figure 3 In some embodiments, the exhaust tailpipe 44 is located outside the engine shroud 2, and the exhaust device 4 also includes a connecting pipe 43, which is disposed on the engine shroud 2, and the exhaust tailpipe 44 is sleeved on the outside of the connecting pipe 43. Since the exhaust tailpipe 44 no longer mates with the mounting hole on the engine shroud 2, but is connected to the engine shroud 2 through the connecting pipe 43, there is no longer a gap between the exhaust tailpipe 44 and the mounting hole on the engine shroud 2. This can improve the sealing of the engine compartment and enhance the ejection capability of the exhaust device 4, which is not only beneficial for heat dissipation in the engine compartment, but also helps to further reduce noise intensity.

[0064] In addition, refer to Figure 2In some embodiments, the construction machinery also includes a fan 6, which is located upstream of the engine 3 in the exhaust direction and is a suction fan. Changing the fan 6, located upstream of the engine 3, from a blowing fan to a suction fan allows the fan 6 to force air upstream of the engine 3 to downstream of the engine 3, thus improving the airflow within the engine compartment. In particular, it can work in conjunction with the exhaust device 4, which has an ejector function, to accelerate the circulation of airflow within the engine compartment, further improving the ejector effect and achieving better cooling and noise reduction.

[0065] The following is combined with Figures 1-7 The embodiments shown further illustrate the present invention.

[0066] like Figures 1-7 As shown, in this embodiment, the power compartment includes a hood 2, an engine 3, an exhaust system 4, a radiator 5, and a fan 6.

[0067] Depend on Figure 1 and Figure 2 It can be seen that the engine cover 2 is installed on the frame 1 and forms a semi-enclosed power compartment space between it and the frame 1 to accommodate the engine 3, etc.

[0068] like Figures 2-3 As shown, engine 3 is located in the power compartment and fixed to the frame 1, providing power to the construction machinery. Engine 3 has an exhaust port 31 for discharging the exhaust gases generated during its operation. The gas discharged from exhaust port 31 has a high temperature and high pressure, belonging to high-temperature and high-pressure gases. At the same time, engine 3 radiates heat into the power compartment during operation, making the air temperature inside the power compartment also high. The accumulation of these high-temperature gases in the power compartment will cause the power compartment temperature to become too high, affecting the heat dissipation performance of radiator 5, and also affecting the working performance and service life of engine 3.

[0069] The exhaust system 4 is used to vent the exhaust gases produced by the engine 3 to the outside of the engine compartment. For example... Figure 2 and Figure 3 As shown, in this embodiment, the exhaust device 4 includes a muffler 41, an ejector tube 42, a connecting pipe 43, and an exhaust tailpipe 44.

[0070] The muffler 41 connects the exhaust port 31 and the ejector pipe 42, and is used to regulate the pressure and reduce noise of the exhaust gas from the engine 3 discharged from the exhaust port 31, and guide the exhaust gas flow towards the ejector pipe 42. Specifically, the muffler 41 is an impedance composite muffler, which is fixed on the engine 3, and its intake and exhaust ports are connected to the exhaust port 31 and the ejector pipe 42, respectively. Using an impedance composite muffler as the muffler 41 is beneficial for significantly reducing the full-frequency noise of the exhaust.

[0071] The ejector 42 connects the muffler 41 and the exhaust tailpipe 44, and is used to guide the engine exhaust gas from the muffler 41 to the exhaust tailpipe 44. The exhaust tailpipe 44 is located outside the engine compartment and is connected to the engine hood 2 through the connecting pipe 43, and is used to discharge the engine exhaust gas to the external environment.

[0072] In this embodiment, the ejector tube 42 works in conjunction with the exhaust tailpipe 44 to effectively eject exhaust gas. By utilizing the pressure difference formed by the high temperature and high pressure exhaust gas of the engine, the surrounding gas is drawn in to ventilate and reduce noise in the power compartment.

[0073] like Figure 4 As shown, the ejector tube 42 includes a first pipe section 421 and a second pipe section 422. The first pipe section 421 is connected to the muffler 41, and the second pipe section 422 is connected to the first pipe section 421 and the exhaust tailpipe 44. Based on this, the engine exhaust, after being regulated and noise-reduced by the muffler 4, flows sequentially through the first pipe section 421 and the second pipe section 422 before flowing into the exhaust tailpipe 44. The inlet of the first pipe section 421 is the inlet of the ejector tube 42, and the outlet of the second pipe section 422 is the outlet of the ejector tube 42.

[0074] Among them, such as Figure 3 As shown, in this embodiment, the first pipe section 421 is sleeved outside the air outlet of the muffler 41 to achieve a tighter connection between the two and effectively prevent gas leakage. Furthermore, to facilitate the connection between the first pipe section 421 and the air outlet of the muffler 41, as shown... Figure 4 As shown, a first opening 423 is provided on the pipe wall at the inlet end of the first pipe section 421. The first opening 423 is an elongated opening extending axially along the first pipe section 421. By providing the first opening 423, it is convenient for the first pipe section 421 to deform during the process of fitting onto the outlet of the muffler 41, thereby making it easier to insert the outlet of the muffler 41 into the first pipe section 421. This is particularly beneficial in solving the problem of installation inconvenience caused by processing errors. In other words, it also helps to reduce the requirements for the processing accuracy of the first pipe section 421 and the outlet of the muffler 41, as well as the fitting accuracy between the two, thus reducing processing difficulty and saving processing costs. Among these, although Figure 4 In this embodiment, the first pipe segment 421 is provided with three first openings 423, but this does not constitute a unique limitation on the number of first openings 423. In other embodiments, the number of first openings 423 may be one, two or more, which is also within the scope of protection of this invention. When the number of first openings 423 is at least two, these at least two first openings 423 may be arranged at intervals along the circumference of the first pipe segment 421, and in particular, may be evenly arranged along the circumference of the first pipe segment 421, so as to facilitate more uniform deformation of the first pipe segment 421 during the fitting process, thereby further facilitating the fitting of the ejector tube 42 and the silencer 41 and improving assembly efficiency.

[0075] In addition, such asFigure 4 As shown, the first pipe section 421 and the second pipe section 422 are connected at an angle, meaning their axes form an angle to accommodate the installation space within the engine compartment, saving space occupied by the exhaust device 4 and making the engine compartment structure more compact. Furthermore, both the first pipe section 421 and the second pipe section 422 are equal-section pipes, meaning their cross-sectional areas are equal along the exhaust direction, i.e., their cross-sectional areas do not change along the exhaust direction. Specifically, the first pipe section 421 is a cylindrical pipe, meaning its cross-section is circular, and its cross-sectional area is equal along the exhaust direction. Unlike the first pipe section 422, the second pipe section 422 is not a cylindrical pipe, but rather its cross-section includes alternating circumferentially connected crests 422a and troughs 422b. Specifically, taking a circle centered at the center of the cross-section of the second pipe segment 422 as a reference, the crest 422a protrudes radially outward from the circle, while the trough 422b is recessed radially inward from the circle. More specifically, adjacent crests 422a and troughs 422b are connected by a connecting part 422c. Both crests 422a and troughs 422b are arc-shaped, and the tangents of adjacent crests 422a and troughs 422b coincide. That is, the slope at the connection between crest 422a and connecting part 422c is equal to the slope at the connection between trough 422b and connecting part 422c. Based on this, the trough 4bb and the two adjacent crests 422a are connected to form a sinusoidal wave unit, and any cross-section of the second pipe segment 422 includes multiple sinusoidal wave units, so that any cross-section of the second tail pipe 422 is formed by connecting the beginning and end of a sinusoidal curve.

[0076] At the same time, such as Figure 3 As shown, when connected to the exhaust tailpipe 44, the second pipe section 422 is at least partially inserted into the exhaust tailpipe 44 to communicate with it. Wherein, as... Figure 6As shown, the exhaust tailpipe 44 includes a first tailpipe section 441, a second tailpipe section 442, a third tailpipe section 443, and a fourth tailpipe section 444 connected sequentially along the exhaust direction. The first tailpipe section 441 and the third tailpipe section 443 are both cylindrical pipes, meaning their cross-sectional areas are equal along the exhaust direction, and both have circular cross-sections. However, the diameters of the first tailpipe section 441 and the third tailpipe section 443 are different; specifically, the diameter of the first tailpipe section 441 is larger than that of the third tailpipe section 443. In this case, the cross-sectional area of ​​the second tailpipe section 442, which connects the first tailpipe section 441 and the third tailpipe section 443, gradually decreases along the exhaust direction, forming a tapered shape that tapers along the exhaust direction. The fourth tailpipe section 44 is connected to the third tailpipe section 43 at an angle, and the fourth tailpipe section 44 is also a cylindrical pipe, meaning its cross-section is circular and its cross-sectional area is equal along the exhaust direction. The second pipe section 422 is at least partially inserted into the exhaust tailpipe 44 by being at least partially inserted into the first tailpipe section 441, and is in communication with the exhaust tailpipe 44.

[0077] Based on the above configuration, when the high-temperature and high-pressure engine exhaust gas flows out from the second pipe section 422, a pressure difference is generated, which entrains the gas and dust in the engine compartment and enters the exhaust tailpipe 44 together, and is finally discharged from the exhaust tailpipe 44. At the same time, the negative pressure generated by the gas discharged from the exhaust tailpipe 44 draws fresh air from the outside into the engine compartment through some gaps (the bottom of the engine compartment and the gaps in the engine cover 2), forming a circulating airflow to ventilate and dissipate heat inside the engine compartment. During this process, on the one hand, the hot air in the engine compartment is drawn out to the outside of the engine compartment, and the cooler outside air is drawn into the engine compartment, forming ventilation and heat dissipation for the engine compartment. Therefore, the engine compartment can be continuously cooled, effectively reducing the temperature inside the engine compartment and improving the cooling performance of the engine compartment. This is beneficial to improving the working performance of the internal structural components of the engine compartment, such as engine 3, and extending the service life of the internal structural components of the engine compartment, such as engine 3. On the other hand, due to the mixing of working fluids (high-temperature and high-pressure engine exhaust gas) and ejector fluids (gas being entrained and drawn in) with different temperatures and velocities, momentum and mass exchange occur, which reduces the exhaust velocity and exhaust temperature. As the exhaust velocity decreases, the exhaust noise will decrease accordingly. Therefore, it can also reduce exhaust noise, achieve effective exhaust cooling and noise reduction, and reduce the noise pollution of the engine compartment to the environment.

[0078] Furthermore, in this embodiment, the outlet end face of the ejector tube 42 (i.e., the outlet end face of the second pipe section 422) is a convex and concave curve. Compared with a smooth circular outlet end face, the outlet of the ejector tube 42 has a larger circumference under the same outlet area, which can increase the ejection boundary and increase the interface area between the two fluids. At the same time, at the outlet of the ejector tube 42, the crest portion 422a and the trough portion 422b guide the working fluid and the ejector fluid in opposite directions. The crest portion 422a guides the engine exhaust gas located inside the ejector tube 42 to flow outward radially, while the trough portion 422b guides the cabin gas located outside the ejector tube 42 to flow inward radially, so that the two fluids form a reverse circulation. All of these can improve the ejection capability of the exhaust device 4 and enhance the mixing of the two fluids, thereby reducing the exhaust temperature and exhaust velocity more fully and efficiently, and achieving better cooling and noise reduction effects.

[0079] In particular, in this embodiment, the adjacent crests 422a and troughs 422b are tangentially coincident arc-shaped. Compared with other arrangements, this not only helps to reduce the processing difficulty of the ejector tube 42, but also helps to increase the velocity uniformity of the ejector boundary airflow, reduce airflow vortices, and facilitate the formation of reverse circulation, thereby further enhancing the ejection effect on the airflow and reducing the pressure loss during the ejection process.

[0080] Furthermore, in this embodiment, the second pipe section 422 is not only configured with an alternating concave and convex curve at its outlet end, but the entire second pipe section 422 is configured with an alternating concave and convex curve. This means that the reverse flow guiding effect of the aforementioned crests 422a and troughs 422b on the two fluids is not limited to the outlet of the second pipe section 422, but begins to play a role from the inlet of the second pipe section 422. This is beneficial for more reliably guiding the two fluids to form a reverse circulation, more fully exerting the effect of enhancing fluid mixing, and thus more effectively cooling and reducing noise.

[0081] Meanwhile, in this embodiment, the second pipe section 422 is configured as a pipe structure with a constant cross-section. Compared to the case of a variable cross-section, this allows for a more suitable outlet airflow velocity for the second pipe section 422 and effectively improves the pressure stability of the airflow at the outlet, thus better facilitating the ejection performance. This is because if the cross-section of the second pipe section 422 gradually decreases, the outlet airflow velocity increases, and the pressure suddenly decreases. While this improves the ejection performance, it also increases pressure loss, engine power consumption, and high-velocity airflow leads to increased exhaust noise. Conversely, if the cross-section of the second pipe section 422 gradually increases, the outlet airflow velocity decreases, and the pressure increases, which is not only detrimental to the ejection performance but also easily leads to greater exhaust resistance.

[0082] By configuring the first tube segment 421 as a tracheal structure with a circular cross-section, the manufacturing difficulty of the ejector tube 42 can be reduced. Of course, in other embodiments, the first tube segment 421 can also be configured such that its cross-section includes crests 422a and troughs 422b that are alternately connected in the circumferential direction.

[0083] When the working fluid and the ejector fluid flow through the exhaust tailpipe 44, they sequentially pass through the first tailpipe section 441, the second tailpipe section 442, the third tailpipe section 443, and the fourth tailpipe section 444. The first tailpipe section 441 serves as a receiving section, and the third tailpipe section 443 serves as a mixing section. Engine exhaust gas, after being pressure-regulated and noise-reduced by the muffler 41, flows out from the ejector pipe 42 and enters the receiving section, where it entrains the surrounding fluid and enters the mixing section for mixing and energy exchange. The velocity gradually equalizes, and the exhaust gas is finally discharged from the fourth tailpipe section 444. In this embodiment, the second tailpipe section 442 tapers along the exhaust direction, which facilitates efficient airflow discharge and reduces pressure loss. The fourth tailpipe section 444 is connected to the third tailpipe section 443 at an angle, which serves to guide the flow and prevent rainwater from entering. Furthermore, the fourth tailpipe section 444 is designed with a uniform cross-section, rather than expanding or tapering, which not only reduces exhaust velocity and thus exhaust noise but also reduces manufacturing difficulty.

[0084] In addition, as mentioned above, in this embodiment, the exhaust tailpipe 44 no longer extends into the engine compartment through the mounting hole on the engine cover 2, but is instead fitted onto the outside of the connecting pipe 43, which is provided on the engine cover 2 and extends to the outside of the engine compartment. This means that in this embodiment, there is no gap between the exhaust tailpipe 44 and the mounting hole on the engine cover 2, thereby improving the sealing of the engine compartment, enhancing the ejection performance of the exhaust device 4, and reducing the intensity of noise radiated outward from the engine compartment.

[0085] Specifically, such as Figure 3 As shown, the connecting pipe 43 is a cylindrical gas pipe, the lower end of which is detachably connected to the inner wall of the shroud 2 via a threaded connector, while the upper end extends to the outside of the shroud 2. The ejector tube 42 is located in the connecting pipe 43 and has a gap between it and the connecting pipe 43, which facilitates the flow of gas inside the chamber through the gap between the connecting pipe 43 and the ejector tube 42 to the outlet of the ejector tube 42, where it is entrained and ejected.

[0086] The exhaust tailpipe 44 is connected to the connecting pipe 43 via the first tailpipe section 441. Furthermore, as... Figure 6As shown, in this embodiment, a second opening 445 is provided on the inlet end wall of the first tailpipe section 441. This is to facilitate installation when the inner diameter of the first tailpipe section 441 is equal to the outer diameter of the connecting pipe 43, and installation is inconvenient due to processing errors or other reasons. The deformation of the first tailpipe section 441 helps reduce the difficulty of connection and prevents gas leakage. The second opening 445 is an elongated opening extending axially along the first tailpipe section 441. The number of second openings 445 is not limited; it can be one, two, or more. When the number is at least two, the second openings 445 can be arranged at circumferential intervals along the first tailpipe section 441. For example, as... Figure 6 As shown, in this embodiment, the number of second openings 445 is specifically three, and these three second openings 445 are evenly arranged along the circumference of the first tail tube 441, so that the inlet end of the first tail tube 441 has a three-pronged opening.

[0087] Radiator 5 and fan 6 are important components of the cooling system in the power compartment, used to cool and dissipate heat from the engine 3 and the power compartment. Radiator 5 is fixed to the frame 1 and located upstream of the engine 3 along the exhaust direction; in other words, radiator 5 is located in front of the engine 3. Fan 6 is located between radiator 5 and engine 3 and is connected to the fan shaft of engine 3, allowing fan 6 to rotate under the drive of engine 3. In this application, "front" is defined based on the direction of travel of the construction machinery, taking the forward direction of the construction machinery as "front," and defining directions such as "up," "down," "top," "bottom," and "rear" based on the orientation when facing forward.

[0088] In this embodiment, fan 6 is an intake fan. Thus, as... Figure 7 As shown, during operation, fan 6 no longer blows hot air from the compartment towards radiator 5, but instead forces the hot air flowing through radiator 5 to the rear of the engine compartment. This not only avoids the hot air flowing towards radiator 5 from affecting its heat dissipation performance, but also accelerates the airflow from front to back in the compartment, increases the airflow of cooling air at the air inlet of radiator 5, and enhances the ejector effect, causing more airflow to flow to the outlet of ejector tube 42 to participate in the entrainment and ejection process, thereby improving the cooling performance of the cooling system, more effectively reducing oil temperature and coolant temperature, and reducing noise.

[0089] Figure 7 The arrows in the diagram indicate the flow direction within the engine compartment. Next, we will combine... Figure 7 Briefly describe the working process of the power compartment in this embodiment:

[0090] During operation, the high-temperature and high-pressure exhaust gas discharged from engine 3 passes through muffler 4, where it is regulated and noise reduced by muffler 41. Then it flows into ejector pipe 42 and from ejector pipe 42 to exhaust tailpipe 44. When it flows through the outlet of ejector pipe 42, it ejects the hot air in the engine compartment. Under the action of the second pipe section 422, it mixes efficiently with the ejected gas in the engine compartment within a short axial distance in exhaust tailpipe 44, effectively reducing exhaust velocity and exhaust temperature, increasing exhaust mass flow rate, and thus significantly reducing temperature and noise.

[0091] At the same time, the negative pressure generated by the exhaust gas draws fresh air from the outside into the engine compartment through the bottom of the engine compartment and the gaps in the hood 2, thus forming a circulating airflow to continuously cool the engine compartment. In addition, the suction effect of the fan 6 forces the hot airflow flowing through the radiator 5 to the rear of the engine compartment, accelerating the circulation of airflow and assisting the internal flow field of the engine compartment. This fully utilizes the air movement inside the engine compartment to improve the cooling and noise reduction effect of the engine compartment.

[0092] In summary, the solution of this embodiment has the following effects:

[0093] (1) Improved ejector performance. With the same outlet area, the ejector tube 42 with the outlet shape of this embodiment can achieve a larger circumference, thereby increasing the interface area between the engine exhaust gas and the engine compartment air, enabling rapid mixing under conditions of less pressure loss, and effectively improving the ejector performance of the exhaust device 4.

[0094] (2) Improved heat dissipation performance. In this embodiment, the exhaust device 4 uses the exhaust gas from the engine as the working fluid and the gas inside the engine compartment as the ejector fluid. It uses the pressure difference generated by the engine exhaust gas to draw the high-temperature air and dust in the engine compartment to the outside of the engine. At the same time, the negative pressure generated by the exhaust gas draws fresh air from the outside into the engine compartment, thereby forming a circulating airflow. Combined with the suction effect of the fan 6, the heat dissipation performance is effectively improved.

[0095] (3) Reduced exhaust temperature. The exhaust device 4 in this embodiment can inject more gas into the exhaust tailpipe 44 to dilute and cool the engine exhaust gas, and achieve efficient mixing within a short axial distance, thereby reducing the temperature of the exhaust gas. Moreover, it has a simple structure, is easy to process, has low cost, good working reliability, and is convenient to install and maintain.

[0096] (4) Reduced exhaust noise. The exhaust device 4 in this embodiment has an impedance composite silencer 41, which can form a pair of opposing circulations at the outlet of the ejector tube 42, improving the ability to draw air from the engine compartment and accelerating the mixing of engine exhaust gas with the air in the compartment, reducing exhaust speed, increasing the mass flow rate of exhaust gas, and significantly suppressing exhaust noise.

[0097] It is evident that this embodiment can accelerate the mixing of engine exhaust gas and cabin air, thereby enhancing ejection capability, and can also improve the heat dissipation capacity of the cooling system while reducing noise.

[0098] Applying the power compartment device of the present invention to construction machinery can effectively improve the performance of the machinery. Therefore, the present invention also provides a type of construction machinery that includes the power compartment device of the present invention.

[0099] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power pod arrangement, characterized by The engine (3) comprises: a hood (2) covering the outside of the engine (3); and an exhaust device (4) communicating with an exhaust port (31) of the engine (3) and configured to exhaust gas flowing out of the exhaust port (31) to the outside of the hood (2), the exhaust device (4) comprising an ejector pipe (42) and an exhaust tail pipe (44) arranged in sequence along an exhaust direction, the ejector pipe (42) comprising a first pipe section (421) and a second pipe section (422) connected to each other, the first pipe section (421) being connected to the exhaust port (31), the second pipe section (422) being at least partially inserted into the exhaust tail pipe (44), and an outlet end surface of the second pipe section (422) comprising wave crest portions (422a) and wave trough portions (422b) connected to each other in sequence along a circumferential direction, the exhaust tail pipe (44) being located outside the hood (2), and the exhaust device (4) further comprising a connecting pipe (43) provided on the hood (2), the exhaust tail pipe (44) being sleeved outside the connecting pipe (43) and being sleeved with the connecting pipe (43) through a first tail pipe portion (441) of the exhaust tail pipe (44), an inner diameter of the first tail pipe portion (441) being equal to an outer diameter of the connecting pipe (43), and the second pipe section (422) extending outside the connecting pipe (43). The wave crest portions (422a) and / or the wave trough portions (422b) are arc-shaped. The wave crest portions (422a) and the wave trough portions (422b) are both arc-shaped, and tangent lines of adjacent wave crest portions (422a) and wave trough portions (422b) coincide.

2. The power pod apparatus of claim 1, wherein, Cross sections of the second pipe section (422) all comprise the wave crest portions (422a) and the wave trough portions (422b) connected to each other in sequence along the circumferential direction; and / or, cross sectional areas of the second pipe section (422) are equal along the exhaust direction.

3. The power pod apparatus of claim 2, wherein, A first opening (423) is provided on a pipe wall of an inlet end of the first pipe section (421).

4. The power pod apparatus of claim 1, wherein, The number of the first openings (423) is at least two, and the at least two first openings (423) are arranged at intervals along a circumferential direction of the first pipe section (421).

5. The power pod apparatus of claim 1, wherein, The exhaust tail pipe (44) comprises a first tail pipe portion (441), a second tail pipe portion (442), a third tail pipe portion (443) and a fourth tail pipe portion (444) connected in sequence along an exhaust direction, the second pipe section (422) being at least partially inserted into the first tail pipe portion (441), and a cross sectional area of the second tail pipe portion (442) gradually decreasing along the exhaust direction.

6. The power pod apparatus of claim 5, wherein, The fourth tail pipe portion (444) is connected to the third tail pipe portion (443) at an angle; and / or, cross sectional areas of at least one of the first tail pipe portion (441), the third tail pipe portion (443) and the fourth tail pipe portion (444) are equal along the exhaust direction.

7. The power pod assembly of any one of claims 1-6, wherein, A second opening (445) is provided on a pipe wall of an inlet end of the first tail pipe portion (441).

8. The power pod apparatus of claim 7, wherein, ​ 9. The power pod apparatus of claim 7, wherein, ​ 10. The power pod apparatus of claim 9, wherein, The number of the second openings (445) is at least two, and the at least two second openings (445) are arranged in a circumferential direction of the first tail pipe portion (441).

11. The power pod assembly of any one of claims 1-6, wherein, The exhaust device (4) further comprises a muffler (41) connecting the exhaust port (31) and the ejector pipe (42).

12. The power pod apparatus of claim 11, wherein, The muffler (41) is an impedance compound muffler.

13. The power pod assembly of any one of claims 1-6, wherein, The power cabin device further comprises a fan (6), and the fan (6) is located upstream of the engine (3) in the exhaust direction, and the fan (6) is a suction fan.

14. A working machine characterized by The power cabin device comprises the power cabin device according to any one of claims 1-13.

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