JPH0436279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an impeller for a mixed flow blower, and particularly to the structure of an impeller for a mixed flow blower used as a blower for an air conditioner.

(Prior Art) Conventionally, the impeller structure of a mixed flow blower has a conical surface 1a of a truncated conical boss 1 as shown in FIG.
It is known that a plurality of wing pieces 2, 2, etc. are individually implanted in the blade (for example, see Japanese Utility Model Application No. 55-67392). However, in this case, since the structure is such that 2, 2, etc. are individually planted on the boss conical surface 1a, it is very difficult to determine the mounting position and mounting angle of the wing pieces 2. mounting means,
For example, the same number of nuts, bolts, etc. as the number of blades are required, resulting in an extremely complicated assembly process.

(Object of the Invention) An object of the present invention is to improve productivity by reducing assembly man-hours by configuring an impeller as a combination of two impeller units each having half the desired number of blades. It's in the middle of nowhere.

(Structure of the Invention) The present invention provides an impeller for a mixed flow blower in which an even number of blade pieces is provided on the conical surface of a truncated conical boss, in which integral protrusions are formed on the blade pieces and the base end of the blade pieces. A spacer piece provided between adjacent wing pieces and forming a part of the conical surface, and a mounting provided integrally projecting in the radial direction from the small diameter side end of the spacer piece to form the truncated surface. A wing unit is formed by the mounting pieces, and the mounting pieces are connected to each other via a connecting member so that half of the desired number of blade units are arranged at equal radial intervals. The two impeller units are assembled with the circumferential end surface of the spacing piece on one side in contact with the base end of the blade on the other side.

Embodiment The structure of an impeller of a mixed flow blower according to an embodiment of the present invention will be described below with reference to FIGS. 2 to 6.

This impeller is constructed by combining two types of impeller units 3, 4 each having half the desired number of blades (three in this embodiment) of blades 2, 2, 2.

The impeller units 3 and 4 are integrally molded from synthetic resin and have the same shape except for a portion (ie, the connecting members 8 and 9).

In other words, both the impeller units 3 and 4 are connected to the blade 2.
and a spacing piece 5 integrally protruding from the base end 2a of the wing piece 2 and forming a part of the conical surface 1a between the adjacent wing pieces 5, and a small diameter side end of the spacing piece 5. Part 5
Three blade units 7 are arranged radially at equal intervals, each consisting of a mounting piece 6 protruding in the radial direction to form the truncated surface 1b of the impeller.
6 connected by annular connecting members 8 and 9 (see FIGS. 4 and 5).

The spacing pieces 5 are shaped so that when the impeller units 3, 4 are combined, the spacing pieces 5, 5, . . . can complete the conical surface 1a of the impeller boss 1. That is, the spacing piece 5 is connected to the adjacent blade pieces 2, 2.
It has the function of determining the spacing between the base end portions 2a, 2a of the blade and forming a part of the boss conical surface 1a. Therefore, the circumferential end surface 5b of the spacing piece 5 It has the same shape as the end portion 2a.

Further, a mounting boss portion 10 integrally protruding in the axial direction is provided at a position on the large diameter end side of the inner surface of the spacer piece 5.
A ring body 11 for preventing swinging in the radial direction of... is attached by screws 12, 12.... Further, each spacer piece 5 is formed with an air hole 13 for cooling the motor.

Bolt holes 14 are formed in each of the mounting pieces 6.

One connecting member 8 (impeller unit 3 side) is
It has a hole 16 into which a bearing boss 15 (described later) is inserted, and the other connecting member 9 (impeller unit 4
side) has a hole 17 into which the connecting member 8 is inserted. That is, when the impeller units 3 and 4 are combined, the connecting members 8 and 9 are fitted together. Furthermore, a protrusion 19 into which a washer 18 (described later) is to be fitted is integrally provided on the back surface of the connecting member.

Impeller units 3 and 4 having the above configuration
When manufacturing the connecting members 8 and 9, which have different shapes, by arranging replaceable insert molds, molding can be performed using the same mold, which reduces the molding cost and assembly cost. A wide reduction can be achieved.

The bearing boss 15 is integrally formed with a flange portion 15a that covers the front surfaces of the mounting pieces 6, 6, . . . of the impeller units 3, 4 and forms the truncated surface 1b of the impeller. The flange 15a has three bolt holes 2.
0, 20, 20 are formed.

In the drawings, 21 is a nut, 22 is a bolt, 2
3 is a bolt hole, and 24 is a guide claw piece for guiding the ring body 11.

This impeller is assembled as follows.

After combining the impeller units 3 and 4 on the same axis with a phase difference of 60 degrees, insert the bearing boss 15 into the hole 16 of the connecting member 8 on the impeller unit 3 side, and then The washer 18 is fitted onto the protrusion 19 of the connecting member 9, and in this state, the bolt 22 is fitted into the bolt holes 20, 14 and 23 and tightened and fixed with the nut 21. after that,
The ring body 11 is attached to the mounting boss portions 10, 10...
are fixed with screws 12, 12... In this embodiment, the bolt holes 14, 14, . . . on the impeller unit 3 side are
The bolts 22, 22... are inserted only into the bolt holes 14, 14... on the impeller unit 4 side, or the bolt holes 14, 14 on both impeller units 3, 4. Of course, it may also be inserted into...

(Effects of the Invention) According to the present invention, the blade 2 and the base end portion 2 of the blade 2
The truncated surface 1b is formed from a spacing piece 5 integrally protruding from a and forming a part of the conical surface 1a between the adjacent wing pieces 2 and 2, and the small diameter side end 5a of the spacing piece 5. Mounting piece 6 integrally protrudes in the radial direction
The mounting pieces 6, 6 are arranged in such a way that the blade units 7, 7, .
Two integrally molded impeller units 3, 4 connected to each other via connecting members 8, 9 are connected to circumferential end surfaces 5b, 5b of spacing pieces 5, 5 on one side.
Since the impeller units 3 and 4 are assembled in contact with the base end portions 2a and 2a of the other blade, respectively, the impeller units 3 and 4, which can be molded using the same mold, can be manufactured by simply combining them, and the assembly structure and This has the excellent effect of significantly simplifying assembly work, significantly improving productivity, and reducing costs through mass production.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view with a part cut away of an impeller of a conventionally known mixed-flow blower, and FIGS. 2 and 3 are a front view and a longitudinal cross-section of the impeller of a mixed-flow blower according to an embodiment of the present invention. 4 and 5 are front views of two impeller units, and FIG. 6 is an exploded sectional view of the impeller of FIG. 2. 1...Boss, 1a...Conical surface, 1b...Truncated surface, 2...
Wing piece, 2a... Base end portion of the wing piece, 3, 4... Impeller unit, 5... Spacing piece, 7... Wing unit.

Claims (1)

[Claims] 1 An impeller for a mixed flow blower comprising an even number of blades 2, 2... provided on the conical surface 1a of a truncated conical boss 1, wherein the blades 2 and the base end 2a of the blades 2. The truncated surface 1b is formed from the spacing piece 5 which is integrally provided in a protruding manner between the adjacent wing pieces 2 and constitutes a part of the conical surface 1a, and the small diameter side end 5a of the spacing piece 5. The blade unit 7 is constituted by the attachment pieces 6 which are integrally provided in the radial direction, and the blade units 7, 7, which are half the number of desired blades, are arranged at equal intervals in the radial direction. The mounting pieces 6, 6... The two impeller units 3, 4 which are integrally molded and are connected to each other via the connecting members 8, 9 are attached to the circumferential end surface of the spacing pieces 5, 5... on one side. An impeller for a mixed flow blower, characterized in that the impellers 5b, 5b... are assembled in a state in which the base end portions 2a, 2a... of the blade pieces on the other side are in contact with each other, respectively.