Heat dissipation and noise reduction system for engineering machine, and engineering machine

Abstract

The present disclosure provides a heat dissipation and noise reduction system for an engineering machine, comprising: two heat dissipation devices (4, 5) arranged in sequence along an air inlet direction; and a cooling apparatus (6) arranged between the two heat dissipation devices (4, 5) and configured to cool air passing therethrough.

Description

Heat dissipation and noise reduction systems for construction machinery and construction machinery Technical Field

[0001] This disclosure relates to the field of heat dissipation and noise reduction technology for construction machinery, specifically to heat dissipation and noise reduction systems and construction machinery. Background Technology

[0002] Construction machinery, as crucial equipment in engineering construction, is characterized by its high power and torque, and its complex and harsh operating conditions. It has numerous heat-generating components during operation, resulting in significant heat dissipation requirements. Heat sources include the engine, hydraulic actuators, transmission system, turbocharging system, and air conditioning system. Typical radiators include water radiators, hydraulic oil radiators, transmission oil radiators, air-to-ground intercoolers, and air conditioning condensers. Construction machinery operates at low speeds with almost no headwinds, necessitating forced airflow from fans to cool the system. Due to the limited space and numerous pipes in the engine compartment, the cooling and noise reduction system typically employs a double-row or multi-row series arrangement. Outside air passes through the upstream radiator for heat exchange before entering the downstream radiator, leading to excessively high intake air temperatures for the downstream radiator. This severely reduces the downstream radiator's cooling capacity, frequently causing engine coolant and oil temperatures to rise under high-temperature and harsh operating conditions, significantly reducing the overall performance and lifespan of the construction vehicle.

[0003] In addition, fan noise is a significant source of noise from the main unit of construction machinery, and reducing fan noise is crucial for overall noise reduction in construction machinery. After a fan is matched with a radiator, the increased airflow resistance and changes in the gas flow field lead to an increase in noise. Fan noise is divided into rotational noise and eddy current noise. Rotational noise is harmonic noise with distinct frequency components generated by the periodic impact of fan blades on the surrounding air; eddy current noise is broadband noise generated by the eddies created by the fan rotation, which cause air disturbance through compression and rarefaction processes. Clearly, reducing fan noise requires addressing both rotational and eddy current noise. Therefore, reducing fan noise has become a critical issue that urgently needs to be addressed. Summary of the Invention

[0004] This disclosure provides a heat dissipation and noise reduction system for engineering machinery, comprising:

[0005] Two radiators arranged sequentially along the air intake direction; and

[0006] A cooling device is arranged between the two radiators to cool the air flowing through it.

[0007] In some embodiments, the cooling device includes a circumferential inner wall and a plurality of cooling fins arranged at intervals, each cooling fin having both ends connected to the circumferential inner wall, and a cooling flow path formed in each cooling fin.

[0008] In some embodiments, the heat dissipation and noise reduction system includes multiple rows of wavy cooling fins arranged alternately along the air intake direction, each row of cooling fins including multiple wavy cooling fins arranged at intervals.

[0009] In some embodiments, each of the cooling fins has a water-absorbing material layer arranged on opposite sides, and a transverse channel is provided in the cooling fin, the transverse channel extending from the cooling flow path to the water-absorbing material layer, so that the water-absorbing material layer absorbs water from the cooling flow path.

[0010] In some embodiments, the cooling device includes a sound-absorbing chamber arranged around the outer periphery of the circumferential inner wall for reducing noise from the main engine of the construction machinery.

[0011] In some embodiments, the anechoic chamber is divided into a plurality of anechoic sub-chambers along the circumferential direction.

[0012] In some embodiments, at least two silencing sub-chambers have different volumes.

[0013] In some embodiments, noise reduction devices are provided in at least some anechoic chambers, the noise reduction devices communicating with the outside through openings formed on the side of the anechoic chamber adjacent to the main unit.

[0014] In some embodiments, the noise reducer has a narrow-diameter inlet channel and an outlet channel, the inlet channel communicating with the outside through the opening, a large-diameter intermediate chamber between the inlet channel and the outlet channel, and sound-absorbing material disposed within the inlet channel.

[0015] In some embodiments, the cross-sectional shape of the anechoic chamber is a trapezoid that gradually narrows from the outside to the inside.

[0016] In some embodiments, a circumferential water channel is provided in the circumferential inner wall, the circumferential water channel being divided into an upper water channel and a lower water channel, the upper water channel being connected to the inlet of the cooling flow path of the plurality of cooling fins, and the lower water channel being connected to the outlet of the cooling flow path of the cooling fins.

[0017] In some embodiments, the heat dissipation and noise reduction system includes a water tank that is connected to the upper water channel and the lower water channel.

[0018] In some embodiments, the heat dissipation and noise reduction system includes a drain pipe for conveying condensate from the air conditioning unit of the construction machinery to the water tank.

[0019] In some embodiments, the cooling device is detachably mounted between the two radiators.

[0020] This disclosure also provides an engineering machinery, including the aforementioned heat dissipation and noise reduction system.

[0021] In some embodiments, the construction machinery includes an exhaust pipe, the ventilation area of ​​the cooling device is smaller than the ventilation area of ​​the two radiators, and two negative pressure flow paths connect the two radiators beyond the ventilation area of ​​the cooling device and the exhaust pipe, respectively, to apply negative pressure to the ventilation area, so that the airflow in the ventilation area can be discharged from the exhaust pipe.

[0022] In some embodiments, the ventilation area is located at the corner of the two generally rectangular radiators.

[0023] In some embodiments, the construction machinery includes a fan for driving air through the heat dissipation and noise reduction system.

[0024] In some embodiments, the two ejector tubes are connected to the exhaust pipe via an ejector cavity, the ejector cavity being configured to create a negative pressure inside the ejector cavity when the high-speed airflow from the engine passes through the exhaust pipe, so as to drive the airflow in the ventilation area to be discharged from the exhaust pipe.

[0025] In some embodiments, a one-way valve is provided in each of the two ejector tubes to connect the ejector tube only when a negative pressure is formed inside the ejector cavity.

[0026] The heat dissipation and noise reduction system disclosed herein can achieve at least one of the following technical effects:

[0027] By using a cooling device to reduce the intake air temperature of the downstream radiator, the cooling capacity of the heat dissipation and noise reduction system can be improved.

[0028] By using multiple sub-anechoic chambers and / or noise reducers of different sizes, the effect of impedance composite noise reduction can be achieved without causing airflow loss and can effectively reduce the rotational harmonic noise and eddy current broadband noise of the fan.

[0029] By setting up an exhaust ejector component, the negative pressure effect of the exhaust ejector is used to improve the heat dissipation capacity of the area with lower airflow speed at the corner of the radiator.

[0030] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:

[0032] Figure 1 shows a schematic diagram of the structure of an engineering machine according to an embodiment of the present disclosure;

[0033] Figure 2 shows a partial cross-sectional view of a heat dissipation and noise reduction system according to an embodiment of the present disclosure;

[0034] Figure 3 shows a schematic diagram of the cooling device according to an embodiment of the present disclosure;

[0035] Figure 4 shows a schematic diagram of the cooling device according to an embodiment of the present disclosure with the outer casing removed, showing multiple sound-absorbing sub-chambers and noise reduction devices located inside;

[0036] Figure 5 shows an enlarged cross-sectional view of region B in Figure 4;

[0037] Figure 6 shows a cross-sectional view of a cooling fin according to an embodiment of the present disclosure;

[0038] Figure 7 shows a cross-sectional view of a noise reduction device according to an embodiment of the present disclosure;

[0039] Figure 8 shows a structural schematic diagram of an engineering machine with an air conditioning unit and a drain pipe according to an embodiment of the present disclosure; and

[0040] Figure 9 shows a partially enlarged view of the exhaust ejector mechanism according to an embodiment of the present disclosure. Detailed Implementation

[0041] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0043] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to specify components is merely for the purpose of distinguishing the corresponding components, and "multiple" means two or more. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0044] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are generally based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0045] As shown in Figure 1, the engineering vehicle includes an engine 1, a fan 2, an air guide 3, a first radiator 4, a second radiator 5, a cooling device 6, and an exhaust ejector mechanism 7. The heat dissipation and noise reduction system includes the first radiator 4, the second radiator 5, and the cooling device 6. The first radiator 4 and the second radiator 5 are arranged sequentially along the air intake direction A, and the cooling device 6 is located between the first radiator 4 and the second radiator 5. Along the air intake direction A, the fan 2 is located downstream of the first radiator 4, drawing air from the outside into the engineering vehicle through the second radiator 5, the cooling device 6, the first radiator 4, and the air guide 3. The air first enters the second radiator 5 for heat exchange, then is cooled by the cooling device 6, and finally enters the first radiator 4 for heat exchange, reducing the intake air temperature of the downstream radiator and improving its cooling capacity.

[0046] As shown in Figure 2, the cooling device 6 includes a silencing chamber 68 arranged around the outer periphery of the circumferential inner wall 64 to reduce noise from the main body of the engineering machinery. The cross-sectional shape of the silencing chamber 68 is approximately trapezoidal, gradually narrowing from the outside to the inside. The silencing chamber 68 is formed by the circumferential inner wall 64, the circumferential outer wall 61, and a first side wall 62 and a second side wall 63. The first side wall 61 connects the cooling device 6 and the first radiator 4, and the second side wall 63 connects the cooling device 61 and the second radiator 5.

[0047] As shown in Figures 3-5, the cooling device 6 includes a circumferential inner wall 64 and a plurality of parallel and spaced cooling fins 65. The circumferential inner wall 64 is connected to both ends of each cooling fin 65. Each cooling fin 65 has a cooling flow path 653 formed within it, through which water flows to cool the air flowing through it. The multiple rows of cooling fins 65 can be staggered along the air inlet direction, increasing the contact area with the airflow and effectively rectifying the airflow, resulting in more thorough cooling.

[0048] As shown in Figure 6, the cooling fin 65 includes a fin body 651, a water-absorbing material layer 652, cooling water channels 653, and transverse channels 654. The cooling fin 65 is a hollow structure with the cooling water channels 653 inside. Multiple transverse channels 654 are provided between the cooling water channels 653 and the two side walls of the cooling fin 65. Water-absorbing material layers 652 are respectively provided on the two side walls of the cooling fin 65. These water-absorbing material layers 652 are made of a material with good water absorption properties. When the cooling water channels 653 are filled with water, the water can reach the water-absorbing material layers 652 through the transverse channels 654. After absorbing water, the water-absorbing material layers 652 can exchange heat when hot air passes through their surface, achieving evaporative cooling. By setting up cooling fins and circumferential water channels, the evaporative cooling effect of water is utilized to reduce the inlet air temperature of the downstream radiator, which is beneficial to improving the cooling capacity of the downstream radiator.

[0049] As shown in Figures 2 and 5, the circumferential inner wall 64 is hollow, and a circumferential water channel 641 is provided inside. Two baffles 645 divide the circumferential water channel 641 into an upper water channel and a lower water channel. The cooling flow path 653 of each cooling fin 65 is connected to the upper water channel through a water inlet 642, and the cooling flow path 653 of each cooling fin 65 is connected to the lower water channel through a water outlet 643. When the upper water channel of the circumferential water channel 641 is filled with water, water enters the cooling water channel 653 through the water inlet 642. Part of the water is absorbed by the water-absorbing material layer 652, and the other part of the water enters the lower water channel of the circumferential water channel 641.

[0050] As shown in Figure 3, an inlet pipe 611, a water pump 612, a water valve 613, and an outlet pipe 614 are arranged on the circumferential outer wall 61. One end of the inlet pipe 611 passes through the top of the circumferential outer wall 61 and communicates with the upper waterway of the circumferential water channel 641, while the other end of the inlet pipe 611 is connected to the water tank 67. The water pump 612 and the water valve 613 are also provided and connected to the inlet pipe 611. The water pump 612 is mounted on the circumferential outer wall 61. One end of the outlet pipe 614 passes through the bottom of the circumferential water channel 641 and communicates with the lower part of the circumferential water channel 641, while the other end of the outlet pipe 614 is connected to the water tank 67. The cooling device 6 also includes a water tank 67 located at the bottom. The water tank 67 is mounted on the vehicle frame via a mounting base 672. A filter screen 671 is provided inside the water tank 67 to filter the water that enters through the outlet pipe 614 after heat dissipation. The water pump 612 enables water to circulate between the various cooling channels and the water tank.

[0051] As shown in Figure 4, the silencing chamber 68 can be divided into multiple silencing sub-chambers 681 along the circumference by multiple partitions 69. The volumes of the multiple silencing sub-chambers 681 can be different, and the larger silencing sub-chambers 681 are suitable for absorbing low-frequency noise.

[0052] As shown in Figures 2, 4, and 7, noise reducers 621 can be installed in some or all of the anechoic chambers 681. The noise reducers 621 communicate with the outside through an opening 621 formed on the side 62 of the anechoic chamber 68 adjacent to the main unit. The noise reducer 66 includes a small-diameter inlet channel 661 and an outlet channel 662. The inlet channel 661 communicates with the outside through the opening 621. A large-diameter intermediate chamber 663 is located between the inlet channel 661 and the outlet channel 662. Sound-absorbing material 664 is placed inside the inlet channel 661. The small-diameter inlet channel 661, the outlet channel 662, and the large-diameter intermediate chamber 663 together form a resistive noise reduction device. Due to the presence of the sound-absorbing material 664, airflow in the cooling duct will not enter the anechoic chamber 68. By using anechoic chambers of different volumes and noise reducers, impedance composite noise reduction is achieved, which effectively reduces fan rotational harmonic noise and eddy current broadband noise without causing airflow loss.

[0053] The size of the noise reduction device 66 is selected according to the volume of the noise reduction sub-chamber. A larger noise reduction sub-chamber is equipped with a larger noise reduction device 66, and a smaller noise reduction sub-chamber is equipped with a smaller noise reduction device 66.

[0054] As shown in Figures 8 and 9, the exhaust ejector mechanism 7 includes an exhaust port 71, an exhaust pipe 72, an ejector cavity 73, a first ejector tube 74, and a second ejector tube 75. One end of the first ejector tube 74 and one end of the second ejector tube 75 are respectively connected to the ejector cavity 73. The other end of the first ejector tube 74 is connected to the corner area of ​​the first radiator 4, and the other end of the second ejector tube 75 is connected to the corner area of ​​the second radiator 5. A first one-way valve 741 is provided between the first ejector tube 74 and the ejector cavity 73, and a second one-way valve 751 is provided between the second ejector tube 75 and the ejector cavity 73. When the high-speed airflow from the engine enters the exhaust pipe 72 through the exhaust port 71, the first one-way valve 741 and the second one-way valve 751 are only activated when a negative pressure is formed inside the ejector chamber 73. The airflow in the corner areas of the first radiator 4 and the second radiator 5, which are respectively connected by the first ejector pipe 74 and the second ejector pipe 75, then enters the ejector chamber 73 and is discharged to the outside along the exhaust pipe 72. The negative pressure effect of the exhaust ejection improves the heat dissipation capacity of the radiator corners where the wind speed is low, thus addressing the problem of poor heat dissipation at the radiator corners. The first one-way valve 741 and the second one-way valve 751 prevent hot air from the exhaust pipe 72 from entering the first and second radiators through the first ejector pipe 74 and the second ejector pipe 75.

[0055] As shown in Figure 8, the cooling device 6 also includes a drain pipe 83. One end of the drain pipe 83 is connected to a water tank 82, which collects condensate generated when the air conditioning unit 8 is working. The other end of the drain pipe 83 is connected to the water tank 67, so as to replenish the water tank with condensate discharged from the air conditioning unit 8 when it is working, which is lower than the ambient temperature. This helps to reduce the temperature of the water in the water tank and thus improve the evaporative cooling effect.

[0056] The cooling device 6 is detachably installed between the first radiator 4 and the second radiator 5, for example, by a slidable plug-in connection. As shown in Figure 3, the circumferential outer wall 61 is provided with a handle 615, which allows the cooling device 6 to be quickly installed and removed from the first radiator 4 and the second radiator 5 by pulling out and pushing in the cooling device 6, and facilitates cleaning and maintenance.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. A heat dissipation and noise reduction system for engineering machinery, comprising: Two radiators (4, 5) are arranged sequentially along the direction of air intake; as well as A cooling device (6) is arranged between the two radiators (4, 5) for cooling the air flowing through it.

2. The heat dissipation and noise reduction system according to claim 1, wherein the cooling device (6) includes a circumferential inner wall (64) and a plurality of cooling fins (65) arranged at intervals, wherein both ends of each cooling fin (65) are connected to the circumferential inner wall (64), and a cooling flow path (653) is formed in each cooling fin (65).

3. The heat dissipation and noise reduction system according to claim 2 includes multiple rows of wavy cooling fins (65) arranged alternately along the air inlet direction, each row of cooling fins (65) including multiple wavy cooling fins (65) arranged at intervals.

4. The heat dissipation and noise reduction system according to claim 2 or 3, wherein each of the cooling fins (65) is provided with a water-absorbing material layer (652) on each opposite side, and a transverse channel (654) is provided in the cooling fin (65) extending from the cooling flow path (653) to the water-absorbing material layer (652) so that the water-absorbing material layer (652) absorbs water from the cooling flow path (653).

5. The heat dissipation and noise reduction system according to any one of claims 2-4, wherein the cooling device (6) includes a sound-absorbing chamber (68) arranged around the outer periphery of the circumferential inner wall (64) for reducing noise from the main machine of the engineering machinery.

6. The heat dissipation and noise reduction system according to claim 5, wherein the silencing chamber (68) is divided into a plurality of silencing sub-chambers (681) along the circumferential direction.

7. The heat dissipation and noise reduction system according to claim 6, wherein at least two silencing sub-chambers have different volumes.

8. The heat dissipation and noise reduction system according to claim 6 or 7, wherein a noise reducer (621) is provided in at least some of the anechoic chambers, the noise reducer (621) communicating with the outside through an opening (621) formed on the side (62) of the anechoic chamber (68) adjacent to the host.

9. The heat dissipation and noise reduction system according to claim 8, wherein the noise reducer (66) is provided with a small-diameter inlet channel (661) and an outlet channel (662), the inlet channel (661) communicates with the outside through the opening (621), a large-diameter intermediate chamber (663) is provided between the inlet channel (661) and the outlet channel (662), and a sound-absorbing material (664) is provided in the inlet channel (661).

10. The heat dissipation and noise reduction system according to any one of claims 5-9, wherein the cross-sectional shape of the anechoic chamber (68) is a trapezoid that gradually narrows from the outside to the inside.

11. The heat dissipation and noise reduction system according to any one of claims 2-10, wherein a circumferential water channel (641) is provided in the circumferential inner wall (64), the circumferential water channel (641) is divided into an upper water channel and a lower water channel, the upper water channel is connected to the inlet of the cooling flow path (653) of the plurality of cooling fins (65), and the lower water channel is connected to the outlet of the cooling flow path (653) of the cooling fins (65).

12. The heat dissipation and noise reduction system according to claim 11 includes a water tank (67), wherein the water tank (67) is connected to the upper water channel and the lower water channel.

13. The heat dissipation and noise reduction system according to claim 12 includes a drain pipe (81) for conveying condensate from the air conditioning unit (8) of the construction machinery to the water tank (67).

14. The heat dissipation and noise reduction system according to any one of claims 1-13, wherein the cooling device (6) is detachably installed between the two radiators (4, 5).

15. An engineering machine, comprising the heat dissipation and noise reduction system according to any one of claims 1-14.

16. The engineering machinery according to claim 15, comprising an exhaust pipe (72) and two ejector pipes (74, 75), wherein the ventilation area of ​​the cooling device (6) is smaller than the ventilation area of ​​the two radiators (4, 5), and the two ejector pipes (74, 75) respectively connect the two radiators (4, 5) beyond the ventilation area of ​​the cooling device (6) and the exhaust pipe (72), thereby discharging the airflow in the ventilation area from the exhaust pipe (72).

17. The engineering machinery according to claim 16, wherein the ventilation area is located at the corner of the generally rectangular two radiators (4, 5).

18. The engineering machinery according to any one of claims 16 or 17, comprising a fan (2) for driving air through the heat dissipation and noise reduction system.

19. The engineering machinery according to any one of claims 16-18, wherein the two ejector tubes (74, 75) are connected to the exhaust pipe (72) through an ejector cavity (73), the ejector cavity (73) being configured to form a negative pressure inside the ejector cavity (73) when the high-speed airflow discharged from the engine passes through the exhaust pipe (72), so as to drive the airflow in the ventilation area to be discharged from the exhaust pipe (72).

20. The engineering machinery according to claim 19, wherein a one-way valve is provided in each of the two ejector tubes (74, 75) for connecting the ejector tube only when a negative pressure is formed inside the ejector cavity (73).

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