JPS61226600A - Variable pitch axial flow blower - Google Patents

Abstract

PURPOSE:To set the optimum angle relation between moving and stationary blades by providing the driving source of a blade-angle variable moving blade on an angle variable stationary blade side and enabling the angle of said stationary blade to be varied by itself being driven by said driving source and to be varied steplessly in line with the angle of said moving blade. CONSTITUTION:When a control motor 10 is driven, a gear 12 fixed to a shaft 11 rotates and the rotation is transmitted to a meshed gear 15, causing a rotary device 17 to rotate, and the external thread part 20 which is meshed with an internal thread 14, slides, varying the blade angle of the blade 8 of an impeller 6. At the same time, an arm 7 inserted in a groove 18 is displaced, causing a stationary blade 5 to make circular arc motion centering around a stationary blade supporting bar 4. If adjustment is performed on assembling to set the blade angle of the blade 8 and the mounting angle of the stationary blade 5 to be optimum, since both the moving and stationary blades rotate simultaneously, the mounting angle of the stationary blade 5 varies steplessly at the same time the blade angle of the moving blade 8 is varied, enabling the optimum angle relation between the moving blade 8 and the stationary blade 5 to be set, to carry out an ideal streamlining at every angle, and always maintaining the angle relation between the blade 8 and the stationary blade 5 optimum.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a variable pitch axial flow M machine used for air conditioning and ventilation in factories, pill mills, etc.

Conventional technology The stationary blades of this type of conventional variable-bitch axial flow blower are fixed;
Even if the blade angle of the moving blade changes, the installation angle of the stationary blade is always constant, and ideal flow rectification is only achieved at a certain blade angle, and ideal flow rectification is not achieved at all angles. , it was not possible to obtain optimal characteristics in terms of performance as a blower. Therefore, there has been a need for a mechanism that can set the optimal stator vane mounting angle for any set vane angle.

For this reason, conventional variable pitch axial flow blowers
For example, as shown in FIG.
is fixed, and an impeller 36 having rotatable blades 35 is directly connected to the modle shaft 34, and the front side of the impeller 36 has a connecting rod 37 which becomes a blade angle variable mechanism for the blades 35 by sliding. One end of the connecting rod 37 is rotatably attached to the casing 31, and the other end connects the casing 3 to a drive rod 39 that passes through the casing 31 and is connected to a drive source 38 for varying the blade angle outside the casing 31.
It had a structure in which it was connected in the vicinity of approximately the central axis position of No. 1.

Problems to be Solved by the Invention In such a conventional configuration, the drive source 3B causes the drive rod 39 to smoothly move, and the connecting rod 37 connected to the drive rod 39 near the approximate central axis position of the casing 31. The blades 35 of the impeller 3G are changed by sliding, and the impeller 36 is directly connected to the shaft 34 of the modle 33 fixed to the stationary blade 32 fixed in the casing 11. Even if the angle is variable, the curvature and mounting angle of the stationary blade 32 are always constant, and ideal airflow is only possible at a certain blade angle, and ideal airflow is structurally impossible at all blade angles. There was a problem.

The present invention solves these problems, and provides a variable pitch axial flow blower that has a driving source on the Shizuoka side that can change the mounting angle, and that simultaneously changes the mounting angle of the stationary blades as the blade angle changes. The purpose is to

Means for Solving the Problem In order to solve this problem, the present invention provides a driving source for the internal variable angle vane on the side of the variable angle stator blade, and the stator vane can change its angle by itself by driving from the driving source. , which is configured to change steplessly according to the rotor blade angle.

Function: With this configuration, when the variable blade angle provided on the stator blade side is driven, the blade angle of the rotor blade changes and at the same time, the mounting angle of the stator blade changes steplessly, making it possible to achieve the optimum! lI
It becomes possible to set the angle relationship between the angle and the stationary blade.

EXAMPLE Below, an example of the present invention will be explained using the drawings (Figs. 1 to 3).
The explanation will be based on Figure).

In the figure, 1 is a cylindrical casing, and inside this casing 1, a cylindrical stator blade support cylinder 3 having a hemispherical lid 2 at one end is fixed radially with a plurality of round stator blade support rods 4, The stator blade support rod 4 is a plate-shaped stator II 5 having a curvature that is so good that it does not come into contact with either the casing 1 or the stator blade support cylinder 3.
It is rotatably provided through the. The stationary blade 5 has a round bar-shaped arm 7 for adjusting arcuate motion near the center of the casing 1 and on the impeller 6 side. Inside the stator blade support cylinder 3, a control model 10 is fixed on a platform-shaped modem support 9 as a driving source for angular movement of the blades 8 and stationary blades 115. A rotation control gear 12 is fixed to the tip of the shaft 11 on the wheel 6 side. Reference numeral 11 denotes a forest-shaped rotator which closes the other end side of the stator blade support cylinder 3 and is rotatable relative to the stator blade support cylinder 3, and a female thread 14 is formed in the bottom part 13 of the rotator 11 passing through the center in the axial direction. It has a tooth profile 15 formed in a hill shape around which the gear 12 meshes, and has a cylindrical part 16 with a smaller outer diameter at the opposite end, which is used to support the stator blade. It is fitted into the inner surface of the cylinder 3 on the side of the blade II6 so as to be rotatable and not to come off. Further, on the outer periphery of this forest-like rotator 11, the stationary blade 5 has a groove 18 into which the tip of an arm 7 that performs an arcuate motion is inserted and moved. , the female thread 14
, the plurality of blades 8 of the impeller 6 are moved by sliding.
A male threaded portion 20 at the end of a round rod-shaped connecting rod 19 whose inner angle can be varied at the same time meshes with the male threaded portion 20 at the end.

The connecting rod 19 is supported by a bearing 21 inside the impeller 6 and has a structure that does not transmit the rotation of the impeller 6. The impeller 6 is directly connected to a shaft 24 of a moldle 23 fixed on a table-shaped moldle support 22 fixed inside the casing 1.

In the above configuration, when the model 10 for IIJ III is driven, the gear 12 fixed to the shaft 11 rotates, which is transmitted to the meshed tooth profiles 15, causing the rotator 17 to rotate.

When the rotator 17 rotates, the male threaded portion 20 meshing with the female thread 14 slides, thereby varying the internal angle of the blades 8 of the impeller 6. At the same time, the arm 7 inserted into the groove 18 is displaced, so that the stator blade 5 moves in an arc around the stator blade support rod 4. By the way, if the inner angle of the blade 8 and the mounting angle of the stationary blade 5 are adjusted at the time of assembly and set to the optimum value, they will rotate at the same time, so when the blade angle is α1, the outflow velocity C21 will be reduced as shown in Fig. 3. Ideal rectification is performed at all angles so that the installation angle β1 of the stationary blade matches the internal angle α2 and the installation angle β2 of the stationary blade matches the outflow velocity 022, and the blade 8 and the stationary II5 are always kept in the best condition. can be kept in a relationship.

Effects of the Invention As described above, according to the present invention, the drive source for the variable squareness stomach is provided on the side of the stator blade, and the stator blade has a structure in which the angle can be changed by itself by driving from the drive source, and the angle of the rotor blade is changed. By creating a mechanism that can simultaneously obtain the optimal angle, it is possible to perform optimal rectification at all internal angles, significantly improving performance compared to conventional models of the same type.
Its industrial effects are significant.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a sectional view of a variable pitch axial flow blower, Figure 2 being a cutaway perspective view of the main parts, and Figure 3 showing the blade angle relationship. The explanatory diagram, FIG. 4, is a side view of a conventional variable pitch axial flow blower. DESCRIPTION OF SYMBOLS 1... Casing, 3... Stator blade support tube, 4... Stator blade support rod, 5... Stator blade, 6... Impeller, 7... Arm, 8... Blade, 10...control mode,
12...Gear, 14...Female screw, 15...Gear,
17...Rotator, 18...Groove, 19...Connecting rod,
20...Male thread part, 23...Mold agent
Yoshihiro Morimoto 1st Figure 3"--'i; Wings Aoi Grape 4---4 flk Poetry Terre 1-Sesagi 6--- Impeller 6--G 1-Door 0---m #rll-11-) Le 17--face JpA aching day-'' begging stick 23-1-7-tl Figure 2

Claims (1)

[Claims] 1. A drive source for the variable angle vane is provided on the side of the variable angle stationary blade,
The variable pitch axial flow blower is configured such that the stationary blades are variable in angle by driving from a drive source and are configured to change steplessly in accordance with the rotor blade angle.