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Impeller, blower and freezing-cooling storeroom

A technology for refrigerators and impellers, which is applied to mechanical equipment, household refrigeration devices, machines/engines, etc., can solve the problems of deterioration of air supply performance of impeller 1, large airflow turbulence, and increased turbulent sound.

Inactive Publication Date: 2003-01-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when the airflows on the pressure surface 5 side and the negative pressure surface 7 side of the trailing edge of the blade 4 merge, the speed difference makes the turbulence of the airflow large.
As a result, the air blowing performance of the impeller 1 deteriorates, and the turbulent sound emitted increases.

Method used

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  • Impeller, blower and freezing-cooling storeroom
  • Impeller, blower and freezing-cooling storeroom
  • Impeller, blower and freezing-cooling storeroom

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0037] Figure 1 to Figure 15 The impeller of the first embodiment of the present invention is shown. exist figure 1 , figure 2 Among them, a plurality of blades 8 are arranged around the hub 3 . The convex part (airflow attachment device) 8a is provided on the trailing edge of the blade 8, the concave part (airflow direction changing device) 8b is provided on the pressure surface 5 side of the blade 8, and one end of the concave part 8b extends to the vicinity of the trailing edge of the blade 8. through the impeller figure 1 Turn left as indicated by the middle arrow 30, and the air is directed as figure 2 Axial outflow indicated by arrow 31. When the impeller 9 is set under the condition of large air duct resistance in the refrigerator, if image 3 As shown, the airflow B with a large velocity component in the radial direction passing through the blade 8 is blocked by the concave part 8b, as Figure 4 and Figure 5 The transformations shown are axial. Therefore...

no. 2 example

[0045] Figure 16 An impeller showing a second embodiment of the present invention. The same symbols are used for the same structural parts as those of the previous embodiments, and descriptions thereof are omitted.

[0046] exist Figure 16 Among them, one end of the concave portion 8b extends to the front end of the convex portion 8a. According to this structure, the airflow F having a large radial velocity component passing through the impeller 9 is blocked by the concave portion 8b on the pressure surface 5 side and transformed into an axial airflow, and flows out from the pressure surface 5 side. By providing the convex portion 8a at the trailing edge of the blade 8 and partially extending the chord length of the blade to suppress the separation of the airflow D on the side of the negative pressure surface 7, the airflow flowing out from the side of the negative pressure surface 7 and the airflow in the axial direction The turbulence generated at the time of merging is...

no. 3 example

[0048] Figure 17 ~ Figure 20 A blower 16 according to a third embodiment of the present invention is shown. The same symbols are used for the same structural parts as those of the previous embodiments, and descriptions thereof are omitted.

[0049] exist Figure 17 , Figure 18 Among them, the outer wall 12 of the blower 16 surrounds two plate-shaped inlet and outlet flanges that divide the suction side and the exhaust side of the blade 8, that is, the outer peripheral edges of the first inlet and outlet flanges 10 and the second inlet and outlet flanges 11 . The swirling flow circulation space 14 between the first inlet and outlet flanges 10 and the second inlet and outlet flanges 11 has an opening 13 facing the blade 8 . A plurality of columns 15 a, 15 b provided in the swirling flow circulation space 14 extend substantially in the radial direction of the blade 8 from the opening edges of the first inlet and outlet flanges 10 and the second inlet and outlet flanges 11 . ...

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PUM

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Abstract

An impeller is provided. A recessed part (air flow direction changing means) 8b is provided on the side of a pressure surface 5 of the blade 8, and a protruded part 8a (air flow adhering means) is provided at a trailing edge part of the blade 8. An air flow passing the impeller 9 is converted into an axial direction by the recessed part 8b and separation of the negative surface side air flow is restricted by the protruded part 8a. Turbulence when the air flow on the negative surface side is confluent with the air flow on the pressure surface side can thus be restricted, thereby deterioration of blowing performance of the impeller and increase of blowing noise can be restricted.

Description

technical field [0001] The present invention relates to blowers used in freezers, air conditioners, office automation equipment, and the like. Background technique [0002] In recent years, axial blowers have been installed in refrigerators, air conditioners, office automation equipment, etc., and are widely used. As a conventional axial flow blower, a blower disclosed in JP-A-11-44432 is known. Hereinafter, a conventional axial flow blower will be described with reference to the drawings. [0003] Figure 22 to Figure 25 is the existing axial flow impeller, Figure 22 is the front view of the impeller, Figure 23 yes Figure 22 The cross-sectional view of the x-x line in the middle, Figure 24 is a partial enlarged view showing the action of the impeller, Figure 25 yes Figure 24 The profile of the y-y line in the middle. [0004] like Figure 22 As shown, the impeller 1 has a hub 3 mountable on a motor 2 and a plurality of blades 4 arr...

Claims

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Application Information

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IPC IPC(8): F04D29/38F04D29/32F04D29/54F04D29/66F25D17/06
CPCF04D29/384F25D2317/0681F05D2240/304F04D29/38
Inventor 森下贤一铃木创三木田琢巳
Owner PANASONIC CORP
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