Engineering machinery and hood heat dissipation air outlet structure thereof

Abstract

The utility model relates to a hood air outlet structure, in particular to an engineering machine and a hood heat dissipation air outlet structure of the engineering machine, and the hood heat dissipation air outlet structure comprises a hood and a radiator installed in the hood. An air outlet window is arranged at the position, right opposite to the radiator, of the hood, and a cooling fan is arranged between the air outlet window and the radiator; a windproof non-perforated area is arranged in the middle of a perforated area of the air outlet window, the projection of the non-perforated area on the plane where a fan disc of the cooling fan is located is square, the center of the projection coincides with the center of the fan disc, the side length L is L = A * D, the coefficient A ranges from 1.3 to 1.7, and D is the diameter of the fan disc. The non-perforated area with proper size and shape is arranged on the air inlet window of the hood, so that the flow field of air flowing out of the air inlet window is improved, the air speed at each part of the air outlet side of the radiator is increased to different degrees, the air return and dust suction conditions in the middle of the air inlet window of the hood are obviously improved, and the aerodynamic noise of a radiating system is reduced.

Description

Technical Field

[0001] The utility model relates to a hood air outlet structure, and more particularly to an engineering machine and a hood heat dissipation and air outlet structure thereof. Background Art

[0002] Construction machinery, such as loaders and graders, has a radiator installed within its hood. An air outlet window is located on the rear end of the hood, and a cooling fan is positioned between the window and the radiator. The fan drives air from the hood out through the window, creating a negative pressure inside the hood. This draws outside air in through the hood's air intake window and flows through the radiator. In existing construction machinery, the air outlet window on the rear end of the hood is a perforated structure. Except for a central area, which may be used for brand logos, perforations are provided throughout the perforated area, allowing air inside the hood to be discharged into the hood.

[0003] The cooling fan includes a fan disc located in the center and fan blades fixed on the fan disc. Since the fan disc has no axial driving effect on the air flow, the flow field in the axial direction of the fan disc is weak, and the air generates turbulence in this area, which generates noise and affects the heat dissipation performance of the cooling system. Utility Model Content

[0004] The technical problem to be solved by the utility model is the high turbulence noise of the heat dissipation and air outlet structure of the hood of an engineering machinery, and provides an engineering machinery and a heat dissipation and air outlet structure of the hood thereof.

[0005] The present invention provides a technical solution for achieving its objectives: a heat dissipation and air outlet structure for a hood of engineering machinery, comprising a hood and a radiator mounted within the hood; an air outlet window disposed on the hood directly opposite the radiator, and a cooling fan disposed between the air outlet window and the radiator; a non-perforated area having an airtight seal in the middle of the perforated area of the air outlet window; the projection of the non-perforated area on the plane of the fan disk of the cooling fan being a square projection of the non-perforated area, the center of the projection of the non-perforated area coinciding with the center of the fan disk; and a side length L of the projection of the non-perforated area being: L = A * D, wherein the coefficient A is between 1.3 and 1.7, and D is the diameter of the fan disk. Furthermore, the coefficient A is equal to 1.5.

[0006] In the heat dissipation and air outlet structure of the engineering machinery hood of the present invention, the upper and lower edges of the non-perforated area are horizontal edges.

[0007] In the heat dissipation and air outlet structure of the engineering machinery hood of the present invention, the distance from the center of the fan disc to the center of the non-perforated area is between 350 mm and 550 mm. Furthermore, the distance from the center of the fan disc to the center of the non-perforated area is between 400 mm and 500 mm.

[0008] In the heat dissipation and air outlet structure of the engineering machinery hood of the present invention, the aperture of the perforations arranged in the perforation arrangement area is 10±2 mm, and the hole spacing of the perforations is 12.5±2 mm. Furthermore, the aperture of the perforations is 10 mm, and the hole spacing of the perforations is 12.5 mm.

[0009] In the heat dissipation and air outlet structure of the engineering machinery hood of the utility model, the air outlet window is arranged at the rear end portion of the hood.

[0010] The technical solution for achieving the purpose of the utility model is: an engineering machine having the above-mentioned engineering machine hood heat dissipation and air outlet structure. The engineering machine can be a loader, a grader, a roller, a bulldozer, etc.

[0011] Compared with the prior art, the utility model provides a non-perforated area of appropriate size and shape on the air inlet window of the hood. The non-perforated area of appropriate shape and size can improve the flow field of the air inside and outside the middle of the air outlet window, so that the wind speed at various places on the air outlet side of the radiator is increased to varying degrees, significantly improving the return air and dust absorption conditions in the middle of the air inlet window of the hood, and reducing the aerodynamic noise of the cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the rear part of the engineering machinery hood of the utility model.

[0013] Figure 2 This is a layout diagram of the heat dissipation and air outlet structure of the engineering machinery hood of the utility model.

[0014] Figure 3 It is a three-dimensional diagram of the hood air outlet window of the engineering machinery of the present invention.

[0015] Figure 4 It is a rear side view of the hood air outlet window of the engineering machinery of the present invention.

[0016] Figure 5 It is a projection diagram of the non-perforated area on the air outlet window of the hood of the engineering machinery of the present invention on the plane where the cooling fan is located.

[0017] Figure 6 This is a comparison chart of the wind speed on the air outlet side of radiators with two different air outlet window structures.

[0018] Figure 7 This is a comparison chart of CFD simulation streamlines of cooling systems with two different air outlet structures.

[0019] Parts names and serial numbers in the figure:

[0020] The hood 10, the air inlet window 11, and the air outlet window 12.

[0021] Perforated area 121 , non-perforated area 122 , top side 123 , bottom side 124 , left side 125 , right side 126 , and non-perforated area projection 127 .

[0022] Engine 21 , radiator 22 , cooling fan 23 , fan disc 231 , fan blades 232 , partition 24 . DETAILED DESCRIPTION

[0023] The specific implementation scheme is described below with reference to the accompanying drawings.

[0024] like Figure 1 Figure 2 As shown, this embodiment relates to a heat dissipation and air outlet structure for a hood of engineering machinery. The air outlet structure includes a hood 10, a radiator 22 installed in the hood 10, an air outlet window 12 provided on the hood 10 directly opposite the radiator 22, and a cooling fan 23 arranged between the air outlet window 2 and the radiator 22. An engine 21 is arranged and installed in the chamber covered by the hood 10, and a partition 24 is provided between the engine 21 and the radiator 22 to separate the radiator 22 and the engine 21 into different chambers. The air inlet window 11 is connected to the chamber where the radiator 22 is arranged.

[0025] Alternatively, as Figure 1 As shown, the air outlet window 12 is located at the rear end of the hood 10, and air inlet windows 11 are provided on both sides and the top of the hood 10. The cooling fan 23 rotates to discharge the hot air in the hood 10 from the air outlet window 12. The air with relatively low external temperature enters the hood 10 through the air inlet window 11, flows through the radiator 22, enters the space between the radiator 22 and the air outlet window 12, and is then discharged by the cooling fan 23. When the air flows through the radiator, it takes away the heat of the radiator, thereby achieving heat dissipation.

[0026] The air outlet window 12 is a mesh grille structure with a cluster of air outlet holes formed into a perforated area 121. Air inside the hood 10 is discharged through the holes in the perforated area 121 to the exterior of the hood 10. The perforated area 121 occupies the majority of the air outlet window 12. An airtight non-perforated area 122 is located in the middle of the perforated area 121. Non-perforated area 122 has no perforations, preventing air from exiting the hood 10 through this area.

[0027] The cooling fan 23 is usually driven by a hydraulic motor or an electric motor. The cooling fan 23 includes a fan disk 231 located at the center and a plurality of fan blades 232 fixedly mounted on the fan disk.

[0028] like Figure 3 Figure 4As shown, non-perforated area 122 is roughly square in shape. Its projection on the plane of fan disk 231 is non-perforated area projection 127. Non-perforated area projection 127 is a square with its center coinciding with the center of fan disk 231. The side length L of non-perforated area projection 127 is: L = A * D, where coefficient A is between 1.3 and 1.7, and D is the diameter of fan disk 231. That is, the side length of non-perforated area projection 127 is 1.3 to 1.7 times the diameter of fan disk 231. A preferred value of coefficient A is 1.5.

[0029] Optionally, the upper side 123 and the lower side 124 of the non-perforated area 122 are horizontal sides, and the left side 125 and the right side 126 are vertical sides, as shown in FIG. Figure 4 On the air outlet window 12, the area surrounded by the upper edge 123, the lower edge 124, the left side 125, and the right side 126 is a non-perforated area 122, in which no perforations are provided, and the center portion thereof is usually used for providing a product logo.

[0030] like Figure 4 As shown, the area outside the non-perforated area 122 and within the dotted line is a perforated area 121, in which a group of perforated holes is provided. The perforations provided in the perforated area have a diameter of 10±2 mm and a spacing of 12.5±2 mm. Preferably, the diameter of the perforations is about 10 mm and the spacing of the perforations is about 12.5 mm.

[0031] like Figure 2 As shown, the distance from the center of the fan disk 231 to the center of the non-perforated area of the air outlet window 12 is between 350 mm and 550 mm.

[0032] This embodiment also provides a construction machine having the aforementioned construction machine hood heat dissipation and air outlet structure. The construction machine may be a loader, a grader, a road roller, a bulldozer, or the like. On this construction machine, the hood 10 is reversibly mounted, with an air outlet window 12 provided at the rear end of the hood 10.

[0033] In this embodiment, a non-perforated area 122 of appropriate size and shape is provided at the air outlet window 12 of the hood 10. The non-perforated area 122 of appropriate shape and size can improve the flow field of the air inside and outside the air outlet window 12, so that the wind speed at various locations on the air outlet side of the radiator 22 is increased to varying degrees, significantly improving the return air and dust absorption conditions in the middle of the outer side of the air outlet window 12 of the hood 10, and reducing the aerodynamic noise of the cooling system.

[0034] Figure 6 This is a comparison chart of the wind speed on the air outlet side of radiators with two different air outlet window structures. Figure 7 This is a comparison of CFD simulation streamlines of cooling systems with two different air outlet structures. Figure 6 Figure 7In the figure, the heat dissipation and air outlet structure corresponding to the left figure does not have a non-perforated area of appropriate size and shape in the middle of the air outlet window (this structure is hereinafter referred to as before improvement), and the heat dissipation and air outlet structure corresponding to the right figure in the figure has a non-perforated area of appropriate size and shape in the middle of the air outlet window in this embodiment (this structure is hereinafter referred to as after improvement).

[0035] Through computer simulation, such as Figure 6 As shown, under the condition that other conditions are the same, by providing a non-perforated area 122 of appropriate size and shape in the middle of the air outlet window 12, the wind speed of the radiator's air-to-air cooling core (CAC), engine water radiator core (RAD), hydraulic oil cooling core (HOC), and torque converter oil cooling core (TOC) on the air outlet side can be increased. As the wind speed flowing through the cooling core increases, the heat dissipation performance of the radiator 22 is also improved.

[0036] like Figure 7 As shown, under the condition that other conditions are the same, by setting a non-perforated area 122 of appropriate size and shape in the middle of the air outlet window 12, the air flow field in the middle position of the outer side of the air inlet window 12 is improved, and the return air and dust absorption phenomena in this area are weakened. The weakening of the return air can reduce the aerodynamic noise of the cooling system and the external radiation noise of the whole machine.

Claims

1. A heat dissipation and air outlet structure for a hood of an engineering machinery, comprising a hood, a radiator installed in the hood, an air outlet window provided on the hood opposite to the radiator, and a heat dissipation fan arranged between the air outlet window and the radiator; characterized in that: The middle part of the perforated area of the air outlet window has an airtight non-perforated area, and the projection of the non-perforated area on the plane where the fan disk of the cooling fan is located is a square non-perforated area projection. The center of the non-perforated area projection coincides with the center of the fan disk of the cooling fan, and the side length L of the non-perforated area projection is: L=A*D, where the coefficient A is between 1.3 and 1.7, and D is the diameter of the fan disk.

2. The heat dissipation and air outlet structure of the engineering machinery hood according to claim 1, characterized in that: The coefficient A is equal to 1.

5.

3. The heat dissipation and air outlet structure of the engineering machinery hood according to claim 1, characterized in that: The upper and lower edges of the non-perforated area are horizontal edges.

4. The heat dissipation and air outlet structure of the engineering machinery hood according to claim 1, characterized in that: The distance from the center of the fan disc to the center of the non-perforated area is between 350 mm and 550 mm.

5. The heat dissipation and air outlet structure of the engineering machinery hood according to claim 4, characterized in that: The distance from the center of the fan disc to the center of the non-perforated area is between 400 mm and 500 mm.

6. The heat dissipation and air outlet structure of an engineering machinery hood according to any one of claims 1 to 5, characterized in that: The aperture of the perforations arranged in the perforation setting area is 10±2 mm.

7. The heat dissipation and air outlet structure of the engineering machinery hood according to claim 6, characterized in that: The hole spacing of the perforations arranged in the perforation setting area is 12.5±2 mm.

8. The heat dissipation and air outlet structure of the engineering machinery hood according to claim 7, characterized in that: The perforations in the perforation setting area have a diameter of 10 mm and a hole spacing of 12.5 mm.

9. The heat dissipation and air outlet structure of an engineering machinery hood according to claim 1, characterized in that: The air outlet window is arranged at the rear end portion of the hood.

10. An engineering machine, characterized in that: The invention has the heat dissipation and air outlet structure of an engineering machinery hood according to any one of claims 1 to 9.

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