JPS62206293A - Variable pitch axial blower - Google Patents

Abstract

PURPOSE:To improve the performance of a blower by providing a mechanism for changing a dynamic blade itself to change the angle by the drive of a rotor due to a drive source to provide simultaneously an optimum angle set to a drive angle. CONSTITUTION:A rotor 15 is rotated by driving a motor 12 to slide a control member 21 and change the blade angle of a blade 10 of an impeller 8. Simultaneously, since an arm 9 is displaced, the intake side portion 6 of a static blade 5 is moved arcuately about a fulcrum of a static support rod 4. Thus, an optimum commutation can be carried out in all blade angles to improve substantially the performance of the motor.

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, conventional variable pitch axial flow blowers
For example, as shown in FIG. 4, a cylindrical casing 31
A mold 33 is fixed inside the mold shaft 34 via a stationary blade 32 having a plurality of curvatures, and an impeller 36 having rotatable blades 36 is directly connected to the mold shaft 34.
6 has a connecting rod 37 which becomes a blade angle variable mechanism for the blade 36 by sliding, the tip of this connecting rod 37 is connected to the center of a driving rod 39, and one end of this driving rod 39 is It had a structure in which it was rotatably attached to the casing 31 and the other end passed through the casing 31 and was connected to a blade angle variable drive source 38 outside the casing 31.

Problems to be Solved by the Invention In such a conventional configuration, the driving source 38 causes the driving rod 39 to move in an arc shape, and the connecting rod 37 connected to the driving rod 39 near the approximately central axis position of the casing 31 is moved. By sliding the blades 35 of the impeller 36, the impeller 36 is directly connected to the shaft 34 of the mold 33 fixed to the stationary blade 32 fixed in the casing 11, so that 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 takes these problems into consideration and aims to provide a variable pitch axial flow blower in which the mounting angle of the stationary blades can be varied at the same time as the blade angle changes.

Means for Solving the Problem In order to solve this problem, the present invention provides a rotor blade driven by a motor within a cylindrical casing, and
A stator blade support tube is disposed at one end of the cylindrical casing, a stator blade is disposed outside the stator blade support tube, and the stator blade support tube is rotated by a control motor in the stator blade support tube. A rotator is provided to be rotatable, a control member is provided that slides in the axial direction as the rotor rotates to vary the angle of the rotor blade, a guide groove is provided on the outer periphery of the rotor, and the stationary blade is supported. A variable pitch axial flow having a suction side part that is pivotally supported on a rod and rotates independently, and a protrusion of the suction side part is inserted into the guide groove so that the angle can be varied by rotation of a rotator. It has the configuration of a blower.

Operation With this configuration, when the drive source of the rotor blade provided on the stator blade side is driven, the blade angle of the rotor blade changes and at the same time, the attachment angle of the suction side of the stator blade changes smoothly and steplessly. The optimal angle between the moving blade and the stationary blade will be determined.

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 a cylindrical stator blade support cylinder 3 with a hemispherical lid 2 at one end is arranged inside the casing 1, and the stator blade support cylinder 3 is located on its outer periphery. The casing 1 is made up of a plurality of round stator blade support rods 4 arranged radially.
is fixed to.

The stator blade 6 has a substantially airfoil shape and is composed of a suction side portion 6 and a discharge side portion 7, and the discharge side portion 7 is arranged approximately parallel to the air flow direction between the casing 1 and the stator blade support cylinder 3. The suction side portion e is formed in such a length that both ends thereof do not come into contact with either the casing 1 or the stator blade support cylinder 3. The rear part of the suction side part 6 and the front part of the discharge side part 7 are pivotally connected to the stator blade support rod 4 in a hinge-like structure, so that the suction side part 6 and the discharge side part 7 are connected. A control mode 12 is fixed inside the stationary blade support cylinder 3 via a trapezoidal mode support 11 as a drive source for angular movement of the blades 10 and stationary blades 6.
A rotation control gear 14 is fixed to the tip of the shaft 13 on the 20-impeller 8 side. The blade 10 side of the stator blade support tube 3 is closed by a forest-shaped rotator 16 that is rotatable relative to the stator blade support tube 3. The bottom 16 of this rotator 16
A screw hole 17 is formed in the center. It also has tooth profiles 18 on the inner wall. A rotation control gear 14 at the tip of the shaft 13 is meshed with the tooth profile 18 of the shaft 13.

The rotator 15 can be freely rotated by fitting the cylindrical portion 19 into the inner surface of the stator blade support tube 3 on the impeller 8 side so as not to come off. Furthermore, a guide groove 20 is formed on the outer periphery of this forest-like rotor 16, and a guide groove 20 is formed on the outer periphery of the forest-like rotor 16.
A protrusion 9 formed at the end of the suction side portion 6 is inserted, and the rotation of the rotator 16 causes the suction side portion 6 to move in an inner arc shape. A male threaded portion 22 at the tip of a round rod-shaped control member 21 is screwed into the screw hole 17 . The control member 21 is configured to vary the blade angles of the plurality of blades 1o of the impeller 8 by sliding. Further, this control member 21 is supported by a bearing 23 inside the impeller 8 and has a structure in which rotation of the impeller 8 is not transmitted. The impeller 8 is a moder 25
The mold 25 is fixed on a mold support 24 inside the casing 1.

In the above configuration, when the control mode 12 is driven, the gear 14 fixed to the shaft 13 rotates, which is transmitted to the meshed teeth 18, and the rotator 16 rotates. Rotator 15
When the control member 21 rotates, the control member 21 having the male threaded portion 22 screwed into the threaded hole 17 slides, and the blade angle of the blade 1o of the impeller 8 is varied.

At the same time, the arm 9 inserted into the guide groove 2o is displaced, so that the suction side portion 8 of the stator blade 6 moves in an arc around the stator blade support rod 4 as a fulcrum.

The relationship between the blade angle of the blade 10 and the mounting angle of the stationary blade 6 at this time is shown in FIG. In the figure, β2 is the blade angle, β
1. β2 is the stationary blade mounting angle, and C21 and C22 are the blade angles α1 and C22, respectively. It shows the outflow velocity at α2. Now, when the blade angle is α1, the mounting angle of the stator blade that matches the direction of the outflow speed C21 is set to β1, and when the blade angle is α2, the mounting angle of the stator blade that matches the direction of the outflow speed C22 is set to β2. This makes it possible to always maintain the best relationship between the blades 10 and the stator vanes 6 so as to perform ideal flow rectification at all angles.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, the drive source for the rotor blades is provided on the stator blade side, the angle of the rotor blades is changed by the drive source, and the stator blades are rotated by the rotor by the drive source. It has a structure that allows the angle to be adjusted by itself when driven, and by creating a mechanism that can simultaneously obtain the optimal angle according to the driving angle,
Optimal flow rectification can be performed at any blade angle, and performance can be significantly improved compared to conventional models of the same type, which has great industrial effects. In addition, the gears on the mold side that can rotate the blade angle and the mounting angle of the stator vanes are engaged as far outward as possible, so the molder can adjust the blade angle and the mounting angle with the minimum load torque. , the mounting angle of the stationary blade can be varied.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a variable pitch axial flow blower according to an embodiment of the present invention, Fig. 2 is a cutaway perspective view of the same essential parts, Fig. 3 is an explanatory diagram of the blade angle relationship, and Fig. 4 is a conventional variable pitch blower. FIG. 2 is a side view of a pitch axial blower. 1...Casing, 3...Stator blade support tube, 4...Stator blade support rod, 6...Stator blade,
6... Suction side part, 7... Discharge side part, 8... Impeller, 9... Arm, 1o
...Blade, 12 ... Control mode, 14 ... Gear, 16 ... Rotator,
17...Screw hole, 18...Gear, 20
...Guide groove, 21 ...Control member, 2
2... Male thread. Name of agent: Patent attorney Toshio Nakao and 1 other person3-
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Claims (1)

[Claims] A rotor blade driven by a motor is provided in a cylindrical casing, a stator blade support tube is provided at one end of the cylindrical casing, a stator blade is provided outside the stator blade support tube, and a stator blade is provided at one end of the cylindrical casing. A rotator rotated by a control motor in the stator blade support cylinder is rotatably provided in the support cylinder, and a control member is provided that slides in the axial direction by rotation of the rotor to vary the angle of the rotor blade, a guide groove is provided on the outer periphery of the rotator, the stationary blade has a suction side portion that is pivotally supported by a support rod and rotates independently, and a protrusion of the suction side portion is inserted into the guide groove; A variable pitch axial flow blower configured to change the angle by rotating a rotator.