JPS6220699A - Variable pitch axial blower - Google Patents

Abstract

PURPOSE:To straighten air flow most suitably, by providing with a side of a stationary blade a drive source for changing an angle of moving blades and making the stationary blade in such a construction that it is actuated by the drive source to change its angle so that the most suitable angle of the stationary blade is simultaneously obtained according to the angle of the moving blades. CONSTITUTION:Driving of a control motor 10 is transmitted to gears 12 and 16 for rotating a rotary unit 13, which permits a male screw 15 and a female screw portion 20 to slide for making a blade angle of blades 8 of a runner 6 variable. Likewise, an arm 7 inserted into a groove 18 is changed so that a stationary blade 5 makes a circular motion about a stationary blade support shaft 4. Since the runner 6 and the stationary blade 5 rotate simultaneously, ideal straightening of air flow can be effected at any angle by most suitably setting a blade angle of the blades 8 and a fitting angle of the stationary blade 5.

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 or ventilation in factories, buildings, etc.

Conventional technology The stator blades of conventional variable pitch axial flow blowers of this type are fixed, and even if the blade angle of the rotor blades is varied, the installation angle of the stator blades is always constant, and it is ideal only at a certain blade angle. The air flow was rectified, and the ideal air flow was not achieved at all blade angles, making it impossible to obtain optimal performance characteristics 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, the conventional variable pinch axial flow blower
For example, as shown in FIG. 4, the motor 3
3 is fixed, and an impeller 36 having rotatable blades 35 is directly connected to the motor shaft 34.
A connecting rod 37 is provided on the front side of the blade 36 by sliding and serves as a blade angle variable mechanism for the blade 36, and the tip of this connecting rod 37 is
A structure in which one end is rotatably attached to the casing 31 and the other end is connected at approximately the center axis position of the casing 31 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

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, and provides a variable pitch axial flow blower in which a drive source is provided on the side of the stator blade whose mounting angle can be varied, and the mounting angle of the stator vane is simultaneously varied as the blade angle changes. The purpose is to

Means for Solving the Problem In order to solve this problem, a stator blade support tube 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 tube. The blade is rotatably mounted, a round bar-shaped arm is provided at the tip of the stator blade base, a control motor is fixed inside the stator blade support cylinder, and the other end of the stator blade support cylinder is closed and the stator blade is closed. A rotator rotatably attached to a blade support cylinder, and an arc-shaped groove formed on the outer periphery of the rotor, and a round rod-shaped arm of the stationary blade is inserted into the groove. It is.

Operation With this configuration, when the variable blade angle variable blade drive drive source 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, resulting in the optimal rotor blade being set. It becomes possible to set the angular relationship between the stator blade and the stator blade.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 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 rotatably provided so as to pass through a plate-shaped stator blade 6 having a length that does not contact either the casing 1 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 side of the impeller e. Inside the stator blade support cylinder 3,
A control motor 1o is fixed on a table-shaped motor support e as a drive source for angular movement of the blades 8 and stator vanes 6, and a rotating shaft 11 is attached to the tip of a shaft 11 on the impeller θ side of the control motor 10. A control gear 12 is fixed. Reference numeral 13 denotes 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 16 is formed in the bottom part 14 of the rotator 13 so as 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 male threaded portion 2o at the end of a round bar-shaped connecting rod 19 that can slide to simultaneously change the blade angles of a plurality of blades 8 of the impeller 6 meshes with the female thread 16. 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 60. Impeller 6
is directly connected to the shaft of a motor 23 fixed on a table-shaped motor support 22 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 rotates, the male threaded portion 20 meshing with the female thread 15 slides, thereby varying the blade 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 blade angle of the blade 8 and the installation angle of the stator 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 α2 that match
Ideal flow rectification is performed at all angles so that the mounting angle β2 of the stator vane matches the outflow velocity C22, and the blade 8 and the stator vane 6 can always be maintained in the best relationship.

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

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a variable pinch axial flow blower according to an embodiment of the present invention, Fig. 2 is a cutaway perspective view of the main parts, Fig. 3 is an explanatory diagram of the blade angle relationship, and Fig. 4 is a conventional variable pinch axial flow blower. It is a side view of a 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, 1o...Control motor, 1
2...Gear, 13...Rotator, 16.
...Female thread, 16...Gear, 18...
...Groove, 19...Connecting rod, 2o...
Male thread part, 23...Motor. Name of agent: Patent attorney Toshio Nakao 1 person 8-
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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. a control motor having a rod-shaped arm and fixed inside the stator blade support tube; a rotator that closes the other end of the stator blade support tube and is rotatably attached to the stator blade support tube; A variable pitch axial flow blower, wherein an arcuate groove is formed on the outer periphery of the rotator, and the round rod-shaped arm of the stationary blade is inserted into the groove.