JPS58500449A - propeller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] propeller The invention relates to a propeller as defined in the preamble of claim 1.

More particularly, the present invention relates to a propeller adapted for use in a blower. .

A wholesaler of noise generated from blowers is concerned about the problems associated with blowers that are difficult to solve. This is one of the most difficult problems. For example, a trumpet-shaped soundproof chamber or a blower. Use a muffler, such as a sound trap, connected at the back in the direction of flow. Efforts have been made to eliminate the noise generated from the blower propeller. came. However, the conventionally known 77L is not satisfactory. (expanding at the end trumpet-shaped sound-insulating chamber or tubular sound-insulating chamber Installing bars requires a large amount of space, and the manufacturing of these chambers Expensive to create and install. Therefore, 77 cannot be attached. When using 77ler, the blower output decreases. do.

In addition to this, conventionally known blowers are not satisfactory in terms of output◇ Increase the blower output and input, increase the propeller pitch angle and/or Increasing the propeller diameter will most likely result in acceptable propeller noise levels. It deviates from in and becomes higher.

It is therefore an object of the invention to overcome the above-mentioned drawbacks. Eyes of the invention The target is also significantly quieter than conventionally known propellers, especially when used in blowers. A propeller whose sound level is the same as that of a conventionally known propeller. It is an object of the present invention to provide a propeller that has succeeded in significantly lowering the propeller. Others of the present invention The aim is to provide a more efficient, especially black An object of the present invention is to provide a propeller adapted for use in a lower.

Advantageous embodiments of the invention are specified in subclaims 2 to 8. That's right.

The invention will now be described in detail with reference to embodiments illustrated in the accompanying drawings. .

Therefore, FIG. 1 illustrates a partially broken perspective view of a blower according to the present invention. It is something.

Figure 2 shows the blower vane shown in Figure 1 cut along line nn in Figure 1. FIG.

The blower shown in FIG. 1 includes a propeller constructed in accordance with the present invention. . The propeller according to the present invention can rotate in the middle of the seven trumpet-shaped frames 13. It includes a hub 1 and vanes 2, 2' which are pivotally supported. The vanes 2, 2' are hub of the hub (visible in Figure 2) and extending radially from l. It is mounted at an angle from a plane that is perpendicular to the axis. Propeller is frame 1 3 is positioned on the extension of the hub 1 and carried by the support 15. It is attached so that it can be rotated by an electric motor 14 that is mounted. As shown , of the vane that the fluid first hits in a propeller rotating in a fluid that is air. Side 3 is the leading edge and the opposite side is the trailing edge. On the other hand, a base that collides with the fluid while rotating The side of the tube 2 is the pressure side 5 and the opposite side is the vacuum side 6.

Located in front of each vane of the propeller shown in Figures 1 and 2 to rotate the vane. A front louvre element 7 is arranged partially in front of the front edge 3 of the vane 2 when viewed in the direction. The front louver element 7 extends substantially parallel to the vane 2 and has a cross-sectional shape. It has an airfoil shape. A part of the front louver element 7 is on the vacuum side of the vane 2. A slot 8 is formed between the front louver element 7 and the vane 2.

The cross-sectional shape of the front louver element 7 is made thinner than the vane 2, and its thickness and width are also narrower. Ru. The front louver element 7 directs some of the fluid that hits the vane to the back of the vane. turbulence generated in the region of the leading edge 3 of the vane is greatly reduced. Can be done. Reduced turbulence reduces fluid resistance as the vanes rotate through the fluid. At the same time as the resistance decreases, the height of the generated noise (i.e. power) also decreases. .

In the illustrated embodiment, the front louver element 7 is similar to the propeller vane. It is fixed to the knob of the ropera.

The front louver element 7 has the same shape as the propeller vane 2, but the pitch is similar to that of the propeller vane 2. For example, the pitch angle is within the range of 0 to 2500 and is more positive than the pitch angle of the propeller vane. Or it is set smaller in the negative direction. If necessary, just in case, pin fixing means The front louver element 7 may be fixed to the vane 2 using a A front hole is attached to the vane torus that surrounds the tip of the sound suppression fin, which will be described later. The bar element 7 may also be fixed.

In the embodiment shown in FIGS. 1 and 2, the trailing edge 4 of each vane 2 is A sound suppression fin 9 is disposed on the side, and the sound suppression fin 9 is concentric with the vane. It extends almost parallel to the vane, and has an airfoil-shaped cross section.

A slot 10 is formed between the sound 111 suppression fin and the vane. acoustic suppression As mentioned above, the fin has an airfoil cross-sectional shape, and has a different thickness and width. They are dimensioned significantly smaller than vanes. Sound suppression fins are vane 2 It is fixed to the propeller hub 1 in the same way.

If necessary, a bin attachment method such as that described above may be used as an eave attachment means for the acoustic suppression fin. and/or it is also possible to use a vane torus as described above. Ru.

In this embodiment, further acoustic suppression fins 11 are provided at the top of each vane 2. The acoustic suppression fins 11 are also disposed on the rear edge side of the acoustic suppression fins 9. so that the vane 2 and the first acoustic suppression fin 9 are concentrically arranged and the vane 2 and the first The sound suppression fins 9 extend substantially parallel to each other. The first sound suppression fin 9 and the first sound suppression fin 9 A slot 12 is formed between the two acoustic suppression fins 11. second sound damper The dimensions (width and thickness) of the limiting fin 11 are significantly smaller than the dimensions of the vane 2, and are In an embodiment, the dimensions are smaller than the dimensions of the first acoustic suppression fin. second acoustic suppression fin 11 is fixed to the first acoustic suppression fin 9 or vane 2 by pin attachment means. Alternatively, it may be fixed to the hub 1, as in the case of vanes. vane and front As described above for the louver element and the first acoustic suppression fin, the vane torus is It may be used as a bottom attachment means or as a supplementary attachment means.

The propeller vane 2 and the front louver element 7 and the first and second shown in FIG. The arrangement of the sound suppression fins 9 and 11 can be understood very well by looking at Figure 2. can be done. As shown in Figure 2, the front louver element and the vane and The first and second sound suppression fins are arranged substantially concavely when viewed from the pressure side 5. difference Furthermore, the front louver element 7, the vane 2, and the first and second sound suppression fins 9, 11 are Each has a concave shape when viewed from the pressure side 5. Front louver element 7 is approximately The first acoustic suppression fin 9 is located on the vacuum side 6 of the vane 2, and the first acoustic suppression fin 9 The second sound damping fin 11 is located on the side 5 and the second sound damping fin 11 is located between the vane 2 and the first sound damping fin. It is located on the pressure side of the control fin 9. Front roots kuichi element 7 and vane 2 and acoustic suppression The control fins 9 and 11 are thicker near the leading edge, and from this part It tapers and becomes thinner towards the trailing edge.

Example 1: In order to determine the characteristics of the propeller according to the invention, the same The propeller shown in Figure 1 was tested alongside a propeller of the same size. test The number of vanes in each propeller used was 8, and the diameter of the propeller was approximately 3 0 cm iτ, and the area occupied by the propeller vanes is It was almost the same as Ropera. During the test, both propellers were rotated at 1400 revolutions per minute. Driven at speed. During the test, the amount of air transported by the propeller was measured. at a certain distance from the propeller and under positive propeller pressure. The overpressure generated on the side was also measured. The level of noise generated by the propeller is audible was rated.

The measurement results are shown in the table below.

Diameter 51cm 30cm Rotation speed 1.400 r, POM 1.400 r, p1m Exhaust air volume 1. 500W? /br 1.500 i/hr Pressure force difference Water column 7u Water column 58 0° Example 2: Measuring the efficiency of the propeller according to the present invention and the tovel of noise generated by the rotation of the propeller. Measurements were taken to determine the The measurements are shown in Figures 1 and 2. An axial blower was used. The rotational speed of the propeller is 1,462 r, p, m. The temperature of the discharged air was -8°C. Efficiency is 1.42 Or, pom A 2.2KW HXUR20802B3 motor made by Strömbelb rotates with Calculated based on the power output by the Connected to the duct so that it can blow out freely The test equipment was listed in Part 1 of BSS No. 84s established in 1982. It was used in accordance with the guidelines.

Table 2 Measurement result 1 Flow rate expressed in volume 4.45 m37 sec Static pressure Water column 54° Total pressure 420 Pa Measurement result 2 Volumetric flow rate 14.753rr? / Efficiency calculated for hr: Output at the time of measurement The power generated was 1.9 KW.

Total pressure 420 Pa Efficacy rate 91% Total sound pressure 76 to 78 decibels Example 6: Similar to the noise level of a propeller according to the invention made for use in an axial blower. Tests were conducted to compare the noise levels of Utsuzu axial blowers made to the same diameter. However, during the test, a diameter of 50 mm rotating at 1.480 r, p, m was used. Sound power levels were measured in the duct test rig of Example 2 using a propeller of Ta.

Table 5 Sound power level in the duct Pst = 160PaHz 63 125 250 500 1.000 2,000 4,000 8.000dB+8 4 B2 85 83 sl sOso 72dB2 97 98 98 96 96 96 96 74 The power level of the propeller according to the present invention is aB+ of 8 The power level of the standard propeller is entered in the dB2 row of the table. It is as it is.

The invention is not limited only to the embodiments described above, but as set forth in the claims below. The present invention may be modified as appropriate without departing from the scope described above. . For example, the shape and pitch angle of vanes, front louver elements, and acoustic suppression fins are compatible. The relative position and number of sheets can be changed as appropriate. Kneematic For blowers, for example, the 90° It is advantageous to use a second acoustic suppression fin with a pitch angle. in this case, In order to increase the output of the blower, the tube-like frame of the blower is fitted with the second acoustic damping film. It may also expand outward at the tip. Front louvered element and base The cross-sectional shape of the fins and sound suppression fins may be plate-like, arcuate, or curved. It may be in the shape of a plate.

If desired, acoustic suppression fins may also be provided on the vacuum side of the vane. Similarly, base A front louver element may be provided on the pressure side of the pump. In addition, the propeller vane The number, and therefore the number of louver elements and sound suppression fins, can be, for example, 2, 6. , 4, 5, 6, 7, 8 or more vanes. You may change it as appropriate to suit your performance. The propeller according to the present invention can be used as a blower. It can be applied not only to a boat or ship on the water. It can also be applied to propellers or for transporting or stirring liquids.

Furthermore, the vanes and front louver elements and acoustic dampers belonging to the propeller according to the invention Each control fin rotates about a radially extending axis about the propeller hub. The configuration may be such that it is possible to do so. Therefore, vanes and front louvers are required. control the pitch angle of the acoustic suppression fins together and/or separately; The vane, front louver element and acoustic suppression fins are brought together to control the Alternatively, they may be rotated separately and moved to the desired position.

Figure 2 Procedural amendment (formality) %formula% 1 Incident indication PCT/FI82100011, title of invention Propeller 3. Person who makes corrections Relationship to the incident: Patent applicant Address: Helsinki, Finland 87SF 00870 Rajkisalo 61 people name Hoefun Owai Representative Heiki Partiala Nationality: Finland 4 Agents: 210 Phone (044) 233-4206 Address: Sunako, Kawasaki-ku, Kawasaki City 1-chome 10-26, subject to correction Translation of application form and drawings Type engraving of description and claims (no change in content) International search report C PC N&ti 5C 3E.

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Claims (1)

[Claims] 1 A hub 1, extending radially from the hub and having an inclined pitch angle (α) consisting of at least two concentric vanes 2 with , the side of the vane that the fluid first encounters is the leading edge 3, and the opposite side is the trailing edge 4. So, on the other hand, the side of the vane where the fluid collides is the pressure side 5, and the opposite side is the vacuum side. In a propeller configured to be side 6, the front side as viewed in the direction of rotation of each vane 2 Concentric front louver elements located on the side and partially in front of the leading edge 3 of the vane. element 7 is arranged, and the front louver element 7 extends substantially parallel to the vane. In addition, its cross-sectional shape is airfoil-shaped, and it partially extends to the vacuum side 6 of the vane. and a slot 8 is formed between the front louver element and the vane. A propeller featuring: 2. A concentric acoustic suppression fin 9 is arranged on the back side of each vane 2, and the acoustic suppression The fins extend parallel to the vanes, and their cross-sectional shape is airfoil-shaped. It is characterized in that a slot 10 is formed between the acoustic suppression fin and the vane. 2. A propeller according to claim 1, characterized in that: 6. Another sound suppression fin 11 is arranged on the back side of the sound suppression fin 9 of each vane 2. The acoustic suppression fins 11 are concentric and extend parallel to the vanes. At the same time, there is a slot between the first sound suppression fin 9 and the second sound suppression fin 110. A propeller according to claim 2, characterized in that the propeller has a jet 12 formed therein. 4. At least a portion of the sound suppression fins 9, 11 are located on the pressure side 5 of the vane 2 A propeller according to claim 2 or 6, characterized in that: 5. Front louver element 7, vane 2, first sound suppression fin 9 and second sound suppression The limiting fin 11 is characterized by forming a concave vane profile when viewed from the pressure side 5. A propeller according to any one of claims 1 to 4. 6 Claim characterized in that the vane 2 has a concave shape when viewed from the pressure side 5. The propeller according to any one of Items 1 to 5 below. 7. The front louver element has a concave shape when viewed from the pressure side 5. A propeller according to any one of claims 1 to 6. 8 The sound suppression fins 9 and 11 attached to the propeller have a concave shape when viewed from the pressure side. Any one of claims 1 to 7, characterized in that propeller on board.