JPS62206291A - Blower - Google Patents

Abstract

PURPOSE:To reduce a change in a wind amount relative to blast resistance by forming auxiliary blade pieces shorter than main blade pieces between the main blade pieces at the connecting end plate side of a multiblade impeller. CONSTITUTION:A ventilating fan 1 has a fan casing 6 and a multi-blade impeller 2 which has disk-like connecting end plate 14, main blade pieces 15, auxiliary blade pieces 16 and a reinforcing ring 17 provided projectingly on the outer peripheral portion of said end plate 14. The auxiliary blade piece 16 is formed to have a half length of the main one 15. Thus, since the degree of vacuum in the half side of connecting end plate 14 becomes larger than that in the half side of air inflow, air suction to the neiborhood of the connecting end plate 14 remote form air inflow port of the multi-blade impeller 2 is improved so that an uniform blast is provided over the whole width of the impeller 2.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a blower using a multi-blade impeller.

It is used in ventilation fans, air conditioners, hair dryers, M-style heaters, etc.

(b) Prior art As a technology prior to the present invention, Utility Model Publication No. 39-25071'
There is an axial flow impeller described in the l+ publication. The axial flow impeller is constructed by the peripheral edge of the mounting disk fixed to the shaft end of the drive shaft.
A plurality of inner blades shorter than the wing length of the outer blades are attached concentrically to the outer blades on the inside of the sword blade. Therefore, the air inlet 11 of the impeller
1J Engineering, 0 By increasing the intake and exhaust efficiency in the inner part, the air flow f'L blown out from the impeller is made to flow at right angles to the outer blade.
This improves the overall efficiency of the impeller by raising the airflow.

However, the inner blade was housed inside the outer blade.

Since the rotational speed of the outer and inner blades is higher, turbulence occurs between the inner and outer blades, which affects the air flow of the entire impeller, resulting in a significant increase in efficiency. Hananakatsu 7'2: @Mat1 The round mold of the impeller has become complicated, and the flow of synthetic resin is not as smooth as before (unable to run smoothly,
Conventional mold v! i. It was difficult to use the entire mold technology as is. Furthermore, there is a limit to its use in impellers with a small outer diameter, and it cannot be used in small-diameter impellers.

Problems to be Solved by the Invention The present invention provides a blower device that reduces changes in air volume due to air resistance from a multi-blade impeller, reduces changes in fan efficiency due to external influences, and is compatible with high efficiency and miniaturization. It provides:

4. Means for Solving the Problems The present invention provides a multi-blade impeller that forms a connection between an electric motor and a rotating shaft of the electric motor, and that protrudes from the outer periphery of the connecting end plate. and a fan casing having an air outlet facing the upper periphery of the suction port facing the tip of the blade of the multi-blade impeller, the blade being a main blade that regulates the length of the multi-blade impeller. This problem is solved by means of forming the main wing piece F with a short secondary wing piece F.

(E) Function The present invention can prevent the structure inside the multi-blade impeller from becoming cylindrical and the generation of turbulence by forming the sub-wing pieces between the main blade pieces. It is possible to improve the air blowing efficiency and even out the air blowing from the impeller.

(f) Example The present invention will be explained based on an example in which the blower device of the present invention is used in a ventilation fan 1.

Fig. 1 is a perspective view of the multi-blade impeller 2, a partial cross-sectional plan view of the ventilation fan l inserted into the opening formed in the second wall W, and Fig. 3 is a view of the multi-blade impeller 20. It is.

Exchange 5. The fan 1 includes a fitting frame 3 which is inserted into an insertion hole formed in a wall W, and a decorative body 4 which is attached to the inner part of the frame 3. The frame body 3 has nine air passages 5 communicating with the layer inner air intake port, a fan casing 6 of the multi-blade impeller 2, and a housing g for a single engine 7 that disturbs the multi-blade impeller 2.
The uncasing 6 has a suction port 9 that faces the center of the end of the multi-blade impeller 2 and communicates with the ventilation shaft 5, and a front multi-blade impeller 20. g5
Suitaguchi IO facing VC and communicating with the outdoors and curved power distribution cutoff machine 7
An insertion hole 12 is formed through which the rotating shaft 11 is inserted.

Due to its structure, the frame body 3 is appropriately divided into a plurality of structural members, molded, and then connected together. The air is sucked into the multi-blade impeller 2 through the ventilation holes J:n1 and 5 on the opposite sides of the decorative body 4 and the frame body 3, and into the multi-blade impeller 2 through the 0 suction RO9 holes.

Air is blown around the outer periphery of the multi-blade impeller 2 and exhausted to the outside from the air outlet 10.

The multi-blade impeller 2 has a disk-shaped connecting end plate 14 in which a connecting portion 13 with the rotating shaft 11 is formed in the center.

The connecting end plate 14 includes a main wing piece 15 and a secondary wing piece 0υ protruding from the outer circumference of the connecting end plate 14, and a reinforcing ring 17 that connects the outside of the tip of the main wing piece 15. The secondary wing piece 16 is the main wing piece 15
The main wing pieces 15 are formed to have half the length H, and the main wing pieces 15 are formed in two rows, and then the secondary wing pieces 16 are formed in one row. Therefore [I
flIi! In the multi-blade impeller 2, the number of blades on the half side of the connecting end plate 14 is increased by 50% of the air inflow half side. #
When the multi-blade impeller 2 is rotated, the degree of vacuum inside the connecting end plate 14 half is '9! Since the degree of vacuum is greater than that of the majority side of the airflow, the connection end plate 14 which is far away from the gust of air of the multi-blade impeller 2
Intake of air into the vicinity is improved, and uniform air is blown over the entire width of the multi-blade impeller 2. and the multi-blade impeller 2
The gust of air blown from the main wing pieces 15, 16 is carried out in the circumferential direction perpendicular to the wing pieces 15, 16, and the air flows in a straight line parallel to the inner surface of the fan casing 6, reducing turbulence.
5 and the secondary wing piece 16 are located on the same circumference, so that each wing piece is 15°1.
Drama 63+ -'F-kuNl="11j;-14t"F
There is no significant difference in flow velocity and direction from the air flow I and the air flow n, and turbulence is prevented from occurring between the air flows.

Figure 4 shows the static pressure between the conventional multi-blade impeller and the multi-blade impeller 2 of the present invention.
FIG. 3 is a diagram showing air volume performance characteristics. In the experiment, a conventional multi-blade impeller was used. 30 sheets are cast evenly spaced by 12 degrees.
I am using one made of Ia. The basic numerical values of the multi-blade impeller 2 of the present invention are the same as those of the conventional multi-blade impeller, and the blade length is t-3.
The tree is 30 IIs, which is approximately half of one tree, and has a -t'c structure. In FIG. 4, the ratio curve A shown as a solid line shows the characteristics of the multi-blade impeller 2 of the present invention, and the ratio curve B shown as a broken line shows the characteristics of the conventional multi-blade impeller. i
Curves L1 and L2, which have a larger slope than curves a and B and have a characteristic that the air volume changes less in response to changes in static pressure, are the air outlet 1.
This corresponds to the ventilation resistance curve of 0.

, In the experiment, by changing the diameter of the duct attached to the air outlet 10, a curve 1 which brings out its characteristics is obtained.
``The CC resistance curve L2 has a small resistance.When the ventilation resistance of the front outlet 10 changes from L2 to LIK, the characteristic on the curve A changes from point a to t)K, and the air volume change amount at that time changes to a. In addition, the characteristics of curve B change from point C to point d, and the change in air volume at that time is important.The fact that the air volume change is larger than that of curve A is that It can be understood from the characteristics.

This is because external pressure such as wind acts on the outlet 010 of the companion ventilation fan 1 (air blower) using the multi-blade impeller 2 of the present invention.

Even if the resistance changes, stable air blowing can be performed without large changes in air volume.

It should be noted that the invention is not limited to the above-described implementation structure, and can be implemented with various changes within the scope of the structure, operation, and effect. The nine toe is formed to the length H of the secondary wing piece gold main wing piece, and is 7BH-'AH *V
It may be shortened by 3Tl to form a multi-blade impeller, or V
You can shorten it by sH.

A secondary wing piece may be formed between the main wing pieces. Namely.

If the number of blades on the connecting end plate side is larger than the number of blades on the air inflow side of the multi-blade impeller, so-called the number of main blades, and the degree of vacuum on the connecting end plate side increases. 1. The effects of the present invention can be obtained. Part of the secondary wing piece is a free end, and if the length of the secondary wing piece is long, vibration problems will occur.

In order to prevent this, the auxiliary wing pieces may be connected with a reinforcing ring like the main wing pieces.

(G) Effects of the Invention What has not yet been invented is that secondary blades shorter than the main blades are formed between the main blades on the connecting end plate side of the multi-blade impeller, thereby preventing turbulent flow between the main blades and the secondary blades. without causing

The static pressure characteristics with respect to the air volume are improved, and efficient feeding can be performed even when the blowing resistance changes.

[Brief explanation of drawings]

Figure 1 is a perspective view of a multi-blade impeller, the second figure is a partially sectional plan view of the ventilation fan, and the third part is a cross-sectional view of the multi-blade impeller. FIG. 4 is a characteristic diagram. ′ (2j・-multi-blade impeller, +31・, frame, il+・
...Fan casing, j71,,, electric r! IJ machine,
+91-...Suction 0. tlol-air outlet, flll...
・Rotating shaft, U series gauze section, (141-・Connection end plate, (c)
...Main wing piece, [lL-・Secondary wing piece.

Claims (1)

[Claims] 1. An electric motor, a multi-blade impeller which forms a connecting part with the rotating shaft of the motor, and has a number of blades protruding from the outer periphery of a connecting end plate, and a blade tip of the multi-blade impeller. A fan casing is provided with a facing suction port and a peripherally facing air outlet, and the blades are formed by a main blade piece that regulates the length of a multi-blade impeller, and a secondary blade piece that is shorter than the main blade piece. A blower device.