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Radiator fan and engine cooling device using it

A radiator fan and fan technology, applied in the field of engine cooling device and radiator fan, to achieve the effect of reducing noise, preventing noise increase, and suppressing noise generation

Inactive Publication Date: 2006-06-28
YANMAR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accompanying this, as Figure 10 As shown, if the characteristics of the original fan are maintained, the specific noise becomes larger. Although it is difficult for the noise of the engine to leak to the outside, the radiator fan becomes a new noise source for the outside of the engine room.

Method used

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  • Radiator fan and engine cooling device using it
  • Radiator fan and engine cooling device using it
  • Radiator fan and engine cooling device using it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0057] Embodiments of the present invention are described below with reference to the accompanying drawings

[0058] (first embodiment)

[0059] figure 1 A schematic diagram showing an engine cooling device using a radiator fan according to a first embodiment of the present invention, 1 is an engine, 2 is a radiator fan (fan) integrally connected to the crankshaft 1a of the engine 1, and 3 is An operating machine such as a power generator or a pump is driven by an output shaft (not shown) of the engine 1 .

[0060] The engine 1 described above is mounted in an engine compartment 11 . The engine compartment 11 is a highly airtight space. An air inlet 11a is provided on an upstream end surface constituting its front portion, and an air discharge port 11b is provided on a downstream end surface constituting its rear portion.

[0061] and, if figure 2 As shown, the radiator fan 2 is accommodated in the fan guard 4, and the fan guard 4 is provided on the downstream side end f...

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PUM

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Abstract

Whereas for each propeller blade of a radiator fan, an attachment angle theta1 at a propeller blade base portion, projected onto a plane parallel to an attachment surface of the propeller blades with respect to the boss is set in a range of 35 to 45 DEG , an attachment angle theta2 of a propeller blade tip portion is set in a range of 15 to 22 DEG . Seven propeller blades and a chord length Ct of the propeller blade tip portion, and an outer circumference length pixDf of the propeller blades are set to satisfy a relationship 0.65<7 Ct / (pixDf)<0.85. A tip broadening ratio of the propeller blades is set to within a range Ct / Cb=1.5 to 2.1, based on the chord length Ct at the propeller blade tip portion, and a chord length Cb at the propeller blade base portion. A fan sweep angle theta3 is set in a range of 15 to 25 DEG.

Description

technical field [0001] The present invention relates to a radiator fan in which a plurality of propeller-shaped blades are mounted on a hub to force air to flow, and an engine cooling device using the radiator fan. Countermeasures for more efficient flow in chambers, increased static pressure efficiency, and reduced noise. Background technique [0002] Conventionally, such a radiator fan, as disclosed in Japanese Patent Application Laid-Open No. Sho 57-44799, can efficiently flow air while maintaining strength while suppressing the length in the direction of the rotation axis. [0003] However, when installing the engine in the engine compartment to cool the radiator with the radiator fan, if Figure 11 As shown, in the characteristics of conventional fans ( Figure 11 Indicated by the thin dashed line) and the air flow resistance in the engine room in the past ( Figure 11 Indicated by the thick dotted line in ), the flow state of the engine cooling air is certain. Then, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/38F04D29/34F01P5/02F01P11/10F04D29/16F04D29/54F04D29/58F04D29/66
CPCF04D29/164F04D29/384F04D29/582F04D29/00F04D29/38
Inventor 大野仪明斋藤昌弘
Owner YANMAR CO LTD