JPS62142898A - Variable pitch axial blower - Google Patents

Abstract

PURPOSE:To improve performance by providing a driving source for a blade angle variable moving blade on a stationary blade side, and enabling the angle of said stationary blade also to be varied being driven by said driving source, to obtain the optimum angle in line with the angle of said moving blade. CONSTITUTION:A stationary blade supporting cylinder 3 as a casing is fixed by means of a support rod 4 which passes through a stationary blade 5. The stationary blade 5 has a round bar-like arm 7 and a ball type roller 19. When a control motor 10 is driven, a rotating device 13 is rotated, an external thread part 21 slides, and an impeller 6 varies the blade angle of blades 8. At the same time, the arm 7 which is inserted in a groove 18 is displaced causing the stationary blade 5 to make a circular ark motion centering around the support rod 4. Thereby, the optimum streamlining can be obtained at every blade angle, improving performance.

Description

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

Conventional technology The stationary blades of this type of conventional variable pitch 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 achieved only at a certain blade angle, and ideal flow rectification is not achieved at all blade 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.
3 is fixed, and an impeller 36 having rotatable blades 35 is directly connected to the motor shaft 34.
has a connecting rod 37 on the front side that allows the blade angle of the blade 35 to be changed by sliding, and the tip of this connecting rod 37 is
One end was rotatably attached to the casing 31, and the other end passed through the casing 31 and was connected to a drive source 38 for varying the blade angle outside the casing 31. It had a structure in which it was connected to the drive rod 39 at approximately the central axis position of the casing 31 .

Problems to be Solved by the Invention In such a conventional configuration, the drive source 38 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 36 are changed by sliding, and since the impeller 36 is directly connected to the shaft 34 of the motor 33 fixed to the stationary blade 32 fixed in the casing 11, the blade angle can be changed. Even if they are varied, the curvature and mounting angle of the stationary blades 32 are always constant, and there is a problem in that ideal flow rectification is possible only at a certain blade angle, and it is structurally impossible to achieve ideal flow rectification at all blade angles. Ta.

The present invention solves these problems by providing a variable pitch axial flow blower with a drive source on the side of the stator blade whose installation angle can be changed, and which simultaneously changes the installation angle of the stator blade as the blade angle changes. The purpose is to provide

Means to Solve the Problem In order to solve this problem, a stator blade support cylinder is provided with a hemispherical lid at one end inside the cylindrical casing, and a plate-shaped stator blade with a curvature is provided on the stator blade support cylinder. A blade is rotatably mounted, the stator blade has a round bar arm rotatably equipped with a spherical roller at its tip, a control motor fixed inside the stator blade support cylinder, and the stator blade The other end of the support cylinder is closed, and a rotator is rotatably mounted on the stator blade support cylinder, an arcuate groove is formed on the outer periphery of the rotor, and a spherical groove is formed at the tip of the stator blade in this groove. It has a structure in which a round bar-shaped arm equipped with a roller is inserted.

When the variable blade angle variable blade drive drive source installed on the stator blade side is driven, the blade angle of the rotor blade changes and at the same time, the installation angle of the stator blade changes smoothly and steplessly, resulting in the optimal The angle of the rotor blade and stator blade will be determined.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1, 2, and 3.

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 provided rotatably through a plate-shaped stator blade 5 having a length that does not contact either the casing IK or the stator blade support tube 3 and has a curvature. 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 motor 10 is fixed on a table-shaped motor support 9 as a drive source for angular movement of the blades 8 and stator vanes 6, and the tip of a shaft 11 on the impeller θ side of the control motor 10 is equipped with a rotating motor. A control gear 12 is fixed. Reference numeral 13 designates a forest-shaped rotator that closes the other end of the stator blade support cylinder 3 and is rotatable relative to the stator blade support cylinder 3, and a female thread 15 is formed in the bottom portion 14 of the rotator 13 to pass through the stator blade support cylinder 3 in the axial direction. It is formed into a hill shape. The inner wall of the bottom part 14 is provided with a tooth profile 16 with a smaller inner diameter than the gear 12, and a cylindrical part 17 with a smaller outer diameter is provided at the tip on the opposite side, which is used as a stator blade support cylinder. It is fitted into the inner surface on the impeller 6 side of No. 3 so as to be rotatable and not to come off. Furthermore, the outer periphery of this forest-like rotator 13 has a groove 18 into which the tip of the arm 7 in which the stationary blade 5 moves in an arc is inserted and moved. A rotatable spherical roller 19 is provided at the tip of the arm 7. The female thread 15 has a male thread 2 at the end of a round bar-shaped connecting rod 20 that can slide to simultaneously change the blade angles of a plurality of blades 8 of the impeller 6.
1 is in mesh. The connecting rod 2o is connected to the bearing 2 inside the impeller 6.
1 and has a structure that does not transmit the rotation of the impeller 6. The impeller 6 is directly connected to the shaft of a motor 24 fixed on a platform-shaped motor support 23 fixed inside the casing 1.

In the above configuration, when the control motor 1o is driven, the gear 12 fixed to the shaft 11 rotates, which is transmitted to the meshed teeth 16, and the rotator 13 rotates. Rotator 13
When the impeller 6 rotates, the male threaded portion 21 meshing with the female thread 15 slides, thereby varying the blade angle of the blades 8 of the impeller 6. At the same time, since the arm 7 inserted into the groove 18 is displaced, the stator blade 5 moves in an arc around the stator blade support rod 4.

By the way, if the blade angle of the blade 8 and the mounting angle of the stationary blade 6 are adjusted at the time of assembly and set to the optimum angle, they will rotate at the same time, so as shown in Fig. 3, when the blade angle is α1, the outflow velocity C21 Stator blade installation angle β1 and blade angle α that match
2, the installation angle β2 of the stator blade matches the outflow velocity C22
Thus, ideal rectification is performed at all angles, and the blades 8 and stator vanes 5 can always be kept in the best relationship.

Effects of the Invention As described above, according to the present invention, a driving source for a variable blade angle blade is provided on the stator blade side, and the stator blade has a structure in which its angle can be varied by one drive from the driving source, and the rotor blade By creating a mechanism that can simultaneously obtain the optimal angle according to the angle, it is possible to perform optimal flow rectification at all blade angles, and it is possible to significantly improve performance compared to conventional structures of the same type. The industrial effects are significant. In addition, the gears on the motor side that can rotate the blade angle and the mounting angle of the stator vanes are engaged as far outward as possible, so the motor can rotate the blade angle with the minimum load torque. Furthermore, the mounting angle of the stationary blade can be varied.

In addition, since a spherical roller is provided at the tip of the stator blade arm, the resistance when moving the stator blade can be reduced, allowing smooth movement of the stator blade.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a variable pitch axial flow blower which is an embodiment of the present invention, Fig. 2 is a cutaway perspective view of the same main part, Fig. 3 is a sectional view of the stator blade attachment part, and Fig. 4 is the same. An explanatory diagram showing the blade angle relationship,
FIG. 6 is a side view of a conventional variable pitch axial flow blower. 1...Casing, 3...Stator blade support tube, 4...Stator blade support rod, 5...Stator blade, 6
...Impeller, 7...Arm, 8...
...Blade, 10...Control motor, 1
2.--gear, 13.-rotator, 15.
...Female thread, 16...Gear, 18...
...Groove, 19...Spherical roller, 20...
...Connecting rod, 21...Male thread. Name of agent: Patent attorney Toshio Nakao and one other person? −
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Claims (1)

[Claims] A stator blade support tube having a hemispherical lid is attached to one end of the inside of a cylindrical casing, and a plate-shaped stator blade having a curvature is rotatably attached to the stator blade support tube, and the stator blade has a spherical shape at its tip. a control motor having a round bar-shaped arm rotatably equipped with a roller and fixed inside the stator blade support tube; a rotator rotatably attached to the stator blade support tube; A variable pitch axial flow blower in which an arcuate groove is formed on the outer periphery of the container, and a round rod-shaped arm having a spherical roller at the tip of the stationary blade is inserted into the groove.