JPS5912196A - Axial-flow fan - Google Patents

Abstract

PURPOSE:To reduce the number of consuming parts such as bearings or the like by a method wherein power and signal, necessary for the operation of an electric motor equipped with a brake, are transmitted to the outside of the machine through a slip ring. CONSTITUTION:The signals of limit switches 24, 25 are transmitted to the outside of the machine through the slip ring 12. A meter arm 26, fixed to a sleeve 10, operates a potentiometer or a differential transformer, which is a rotating wing angle detector 27, to detect the rotating angle of a shaft 17. This signal is also transmitted to the outside of the machine through the slip ring 12. Accordingly, the bearing, which was necessary in case of adjusting the rotating wing angle, becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is used in devices such as air conditioners, industrial cooling towers, and heat exchangers, in which rotary blades are attached to a runner hub fixed to a rotary drive shaft so that the attachment angle can be adjusted. Regarding axial flow blowers.

In general, this type of blower needs to be able to control the angle of the rotor blades so that the air volume and pressure of the blower reach the required values in response to changes in temperature, etc., and energy consumption can be reduced by controlling the angle. , reducing noise.

To this end, the rotary blades of the blower are attached to the runner hub so that the angle of attachment of the rotary blades can be fully adjusted, and the runner hub is driven by a motor. In order to adjust the TI angle, various types of bearings are always required when transmitting operating force from outside the aircraft to the support of the rotor blade. It survives by constantly receiving the radial load due to the rotation of the For this reason, maintenance regarding the life of the bearing and lubrication is required, which is not always satisfactory or desirable.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and to adjust the mounting angle of the rotor blade by changing the angle of rotation by operating an electric motor with a brake for adjusting the angle of the rotor blade attached to the runner hub via a transmission device M. In addition, an axial flow blower is provided with a rotor blade angle detector to detect the mounting angle of the rotor blade, and transmits electric power to be supplied to the electric motor with a brake, signals of its operation or stop, and the mounting angle via a slip ring. The goal is to provide the following.

According to the axial flow blower invented by John, there is no need for bearings, which were necessary when adjusting the rotor blade angle by operating force from outside the machine, and maintenance is also simpler, making it extremely practical. There are advantages.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, a speed reducer 2 is installed in the center of a fan casing 1. The speed reducer 2 is connected to the motor 5 via a transmission shaft 6. Output shaft 3 of reduction gear 2
A runner hub 4 containing a variable blade adjustment device is fitted into the runner hub 4 . At the center of the runner hub 4, a slip ring 12,
An electric motor 7 with a brake and a speed reducer 8 are installed. The electric motor 7 with a brake is a drive source for controlling the angle of the rotary blade 160, and is decelerated by a reducer 8, and its rotational force is transmitted to an adjustment frame 9 serving as an output shaft. Next, referring to FIG. 2, a sleeve 10 is screwed onto the adjustment frame 9.
The sleeve 1D is moved in the vertical direction by the adjustment frame 9 being rotated by the brake motor 7. A spider 11 is fixed to the sleeve 10, and therefore the spider 11 moves up and down as the sleeve 10 moves up and down. The electric power supplied to the electric motor 7 with a brake, its operating signal, and stop signal are equipped with a brake! , is transmitted via a slip ring 12 installed at one end of the motive 7 (see Figure 1). According to this invention, the sleeve 10 is moved up and down by the adjustment frame 9, and in particular, the runner
- This relates to an axial flow blower equipped with a rotary blade angle adjustment device in which a reducer 8, a brake-equipped electric motor 7, and a slip ring 12 are sequentially arranged in series with respect to the blade 4. Then,
The rotor angle adjustment device will be explained with reference to FIGS. 2 and 6. The rotor 16 is fixed by bolts 18 to a pivot 17 which is pivoted to the runner hub 4 by means of bearings 14, 15, 16. The bearing 15 is a thrust bearing for supporting the centrifugal force of the rotor 13, etc., and the bearings 14 and 16 are radial bearings for supporting the radial load of the rotor. The pivot pin 17 is fixed to the adjustment arm 19 by a knock pin 20. In particular, as shown in FIG. 3, a roller shaft 21 is provided through the adjustment arm 19 at a position offset from the center of the pivot shaft 17 by a distance l, and the roller shaft 21 is provided with a roller 22.
is loosely fitted so that it can rotate freely. Therefore, the roller shaft 21
When the rotor blade 13 is pivoted or swung around the center of the adjustment arm 19, that is, the center of the pivot shaft 17, the attachment angle of the rotor blade 13 to the runner blade 4 will respond to the amount of oscillation of the adjustment arm 19 within the range of angle θ. This will change.

The sleeve 10 is fixed to the spider 11 by bolts, and the roller 22 is held between them. Therefore, the vertical movement of the sleeve 10 is caused by the axis 1
7f: Rotate the pivot 17 by swinging the roller 22 as a pivot point. The rotational movement of the pivot shaft 17 is adjusted by changing the mounting angle θ of the rotary blade 16 fixed to the pivot shaft 17. A dog arm 23 fixed to the sleeve 10 with bolts moves up and down together with the sleeve 10 to open and close limit switches 24 and 25f. limit switch 24
．． Reference numeral 25 controls the upper limit or lower limit of the sleeve 10, and operates or stops the electric motor 7 with a brake, or controls reversible rotational movement. Of course, limit switch 2.4.
The signal 25 is transmitted to the outside of the machine via the slip ring 12.

Furthermore, a meter arm 26 fixed to the sleeve 10 operates a potentiometer or a differential transformer, ie, a rotor angle detector 27, to detect the rotation angle of the pivot shaft 17. Of course, this signal is also transmitted to the outside, ie, outside the machine, via the slip ring 12.

As described above, in the axial blower according to the present invention, the electric motor with a brake, which is the drive source, is attached to the runner to adjust the installation angle of the rotor blade, and the electric power and signals necessary for operating the electric motor with the brake are required. It can be transmitted to the outside of the machine via all slip rings, reducing the number of consumable parts such as bearings, and further improving the reliability of axial flow blowers with rotary blade adjustment devices. The practical effects are remarkable.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an axial blower according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 6 is a partial side view of FIG. 2 showing the relationship between the pivot shaft and the roller shaft. . 6...Output shaft (rotary drive shaft) 4...Runner hub 7...Electric motor with brake 8...Reducer 12...Slip ring 13...Rotor blade 27...Rotor blade angle detector Agent Patent attorney 1) Parent Male

Claims (1)

[Claims] In an axial flow blower in which a rotor blade is added to a runner fixed to a rotary drive shaft so that the mounting angle can be adjusted, an electric motor with a brake for adjusting the mounting angle of the rotor blade, and a motor for adjusting the mounting angle of the rotor blade are provided. a rotary blade angle detector for detecting the mounting angle, the electric motor with a brake is attached to the runner hub via a reducer, and furthermore, electric power and signals for driving the electric motor with a brake are transmitted via a slip ring. An axial flow blower characterized by a transmission.