JPH0960599A - Blade angle adjustment mechanism of axial blower - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] Improving the workability of the initial setting of the blade angle of the moving blade of the axial flow fan and the fine adjustment of the blade angle after the on-site installation.
Fine adjustment of blade angle can be easily performed by only external screw operation without disassembling the rotor hub. SOLUTION: For a hollow rotor hub 6 connected to a drive motor shaft, rotor blades 7 mounted on the peripheral surface of the rotor hub, and a support shaft 7b on the blade root side of each rotor blade are pivotally fixed to the rotor hub. In the axial blower in which the end surface of the rotor hub is closed by the hub cover 6a, the blade angle adjusting lever 11 is coupled to the spindle of the rotor blade via the key 12 on the inner side of the rotor hub,
Further, a bifurcated operation leg portion 1 formed on the blade angle adjusting lever
A blade angle adjusting screw 15 is screwed on the front wall of the rotor hub so that the screw tips abut against 1a and 11b, and by operating the blade angle adjusting screw from the outside with the moving blade assembled to the rotor hub, Finely adjust the blade angle of the moving blade by swinging the blade angle adjustment lever.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade angle adjusting mechanism for an axial blower applied to tunnel ventilation equipment for automobile roads.

[0002]

2. Description of the Related Art First, FIG. 3 shows the entire structure of the axial blower described above. In the figure, 1 is an outer cylinder of a casing forming a wind tunnel of a blower, 2 is an inner cylinder fixed to the center of the outer cylinder 1 through a vane 3, stay vanes 4, and 5 is a drive incorporated in the inner cylinder 2. A motor, 6 is a rotor hub connected to the shaft of the drive motor 5, 7 is a rotor blade arranged and mounted on the peripheral surface of the rotor hub 6, and 8 is a cone-shaped wind direction cover provided in front of the rotor hub 6.

Next, FIG. 4 shows a detailed structure for mounting the moving blades in the blower. The rotor hub 6 is formed as a hollow body, the boss portion 6a of the center thereof is fitted and connected to the shaft 5a of the drive motor 5, and the open end surface of the axial direction is closed by a hub cover 6b to prevent intrusion of dust and the like. . With respect to the rotor hub 6, the rotor blade 7 is such that the root side support shaft 7b connected to the blade 7a is inserted into a mounting hole formed in the peripheral surface of the rotor hub 6, and the blade angle of the blade 7a is initially set to a predetermined angle. The support shaft 7b is firmly fastened and fixed to the rotor hub 6 with the double fixing nut 9 so that the moving blade does not move from this position.

In this case, the above-mentioned moving blade 7 is set with a standard blade angle at the time of assembling the blower at the factory, and after the blower product is installed at a site such as an automobile road tunnel, a wind pressure test is carried out at the site. The fine wing angle is fine-tuned again while checking the air volume. As a work procedure for fine adjustment of the blade angle performed at the installation site, the wind direction cover 8 (see FIG. 3) is removed with the blower installed, the hub cover 6a is further removed from the rotor hub 6, and the fixing nut 9 is loosened. The blade angle of the moving blade 7 is finely adjusted, and after the adjustment, the double nut 9 is tightened again to firmly fix the moving blade 7, and then the hub cover 6a and the wind direction cover 8 are assembled. In addition,
Actually, the blade angle fine adjustment and the air blowing test are repeated to determine the optimum blade angle.

[0005]

As can be seen from the above work procedure, when the blade angle of the moving blade 7 is finely adjusted at the installation site of the blower, the conventional moving blade mounting structure shown in FIG. It is necessary to remove the hub cover 6a of the rotor hub 6 each time and then loosen or tighten the nut 9 fixing the rotor blade 7 to perform a troublesome disassembling operation. Further, when the fixing nut 9 is tightened with a tool after the rotor blade 7 is finely adjusted and set to a new blade angle, a rotational torque acts on the support shaft 7b of the rotor blade 7 due to a frictional force, so that the blade 7a of the rotor blade 7 is moved. There is a risk that it will be displaced from the adjusted and set position.

The present invention has been made in view of the above points, and an object thereof is to solve the above problems and to improve the workability of the initial setting of the blade angle with respect to the moving blade and the fine adjustment of the blade angle after the on-site installation of the blower. An object of the present invention is to provide a blade angle adjusting mechanism for an axial blower, which is improved and allows fine adjustment of the blade angle of a moving blade simply by screw operation from the outside without disassembling the rotor hub each time.

[0007]

In order to achieve the above object, according to the present invention, a hollow rotor hub connected to the shaft end of a drive motor is provided on its peripheral surface for each rotor blade. In the axial blower in which the support shaft of the blade root side is pivotally fixed to the rotor hub and multiple rotor blades are attached, and the axial opening end surface of the rotor hub is closed by the hub cover, the rotor hub inner side is used as the rotor shaft support shaft. A blade angle adjusting lever is connected, and a blade tip is pressed against the operating end of the blade angle adjusting lever to screw a blade angle adjusting screw on the front surface of the rotor hub, and the blade is assembled in the rotor hub. The angle adjustment screw is externally operated to adjust the blade angle of the moving blade via the blade angle adjustment lever.

Here, the blade angle adjusting lever in the above-mentioned configuration is a ring body in which the operating legs are formed by being divided into two portions on the circumference thereof, and a pair of operating members in which the end faces of the operating legs are screwed into the rotor hub. It shall be fitted and connected to the spindle of the moving blade by facing the screw for use. The means for connecting the support shaft of the moving blade and the ring body of the blade angle adjusting lever may be a method of connecting with a key, or a groove between the support shaft of the moving blade and the blade angle adjusting lever. A wedge-shaped pressing ring is installed on the blade, and a fixing flange for pressing the pressing ring onto the end surface of the blade angle adjusting lever and a fastening bolt for the fixing flange are attached, and the pressing ring is tightened through the fixing flange by the tightening operation of the fastening bolt. It is possible to adopt a method in which the shaft of the moving blade and the blade angle adjusting lever are connected by pushing the blade into the groove.

Further, after adjusting the blade angle of the moving blade, it is preferable to fix the blade angle adjusting screw with a lock screw for preventing loosening. According to the above configuration, when fine-adjusting the blade angle of the moving blade in the assembled state of the blower, the simple operation of screwing the blade angle adjusting screw from the outside without removing the hub cover of the rotor hub each time is required. Fine adjustment of the blade angle can be done with. In other words, of the pair of blade angle adjustment screws set up on the rotor hub,
When loosening one adjustment screw and tightening the other adjustment screw, the blade angle adjustment lever rotates due to the constraint of the adjustment screw,
Along with this, the blade of the moving blade rotates around its supporting shaft and the blade angle changes. In addition, after adjusting the blade angle, the moving bolt can be stably fixed and held at the adjusting position by fixing the adjusting bolt with the lock screw.

Further, with respect to the connection between the support shaft of the moving blade and the blade angle adjusting lever, a key which is a general connecting means can be adopted, and particularly in the connecting structure using a wedge-shaped pressing ring, the support of the moving blade is supported. The mounting angle of the adjustment lever relative to the shaft can be set arbitrarily. In the key coupling method, the relative mounting position of the adjusting lever with respect to the spindle of the moving blade is uniquely determined by being constrained by the key.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. Note that FIG.
The same reference numerals are attached to the same members corresponding to. [Embodiment 1] In FIGS. 1A and 1B, the moving blade 7 is a blade 7.
A support 7b connected to the root side of "a" is supported by a fitting shaft on the peripheral surface of the rotor hub 6, and is rotatably supported by a stopper nut 10 so as not to come off. A ring-shaped blade angle adjusting lever 11 is connected via a key 12 to the shaft end of a support shaft 7b that penetrates the rotor hub 6 and projects inwardly thereof, and further, a fixing flange 13 and a fastening bolt 14 are provided. It is fastened and fixed to the coupling position via.

The blade angle adjusting lever 11 is shown in FIG. 1 (b).
As shown in FIG. 3, the operating leg portions 11a and 11b are formed in two forks on the circumference, and the blade 7a of the rotor blade 7 is set to the standard blade angle with respect to the rotor hub 6, An end surface of a bifurcated operation leg portion formed on the adjusting lever 11 is connected to the support shaft 7b via a key 12 so that the end surface of the operation leg portion faces the front surface of the rotor hub 6 in parallel. Further, a pair of blade angle adjusting screws 15 are screwed on the front wall of the rotor hub 6 so as to face the operation leg portions 11a and 11b of the blade angle adjusting lever 11 and abut the screw tips on the end faces thereof.

With this configuration, when finely adjusting the blade angle of the moving blade 7 from the standard angle, one of the pair of blade angle adjusting screws 15 screwed to the front surface of the rotor hub 6 is adjusted by operating the screw from the outside. While loosening the screw, tighten the other adjusting screw. As a result, the blade angle adjusting lever 11 is constrained by the two adjusting screws 15 to rotate from the solid line position in FIG. 1 (b) to the chain line position, and the moving blade 7 coupled to the adjusting lever 11 accordingly. The blade angle is finely adjusted by rotating around the support shaft 7b. That is, of the operating legs 11a and 11b of the adjusting lever 11, the adjusting screw 15 facing the operating leg 11a is loosened, and the adjusting screw 1 facing the operating leg 11b is loosened.
When 5 is tightened, the moving blade 7 rotates counterclockwise, and when the screw operation is performed in the opposite direction to the above, the moving blade 7 rotates clockwise and the blade angle is finely adjusted. . Moreover, since the support shaft 7b of the moving blade 7 and the blade angle adjusting lever 11 are connected by the key 12, there is no risk of the blade angle shifting from the adjustment position, and the adjusting screw 15 is used after adjusting the blade angle. By pressing the lock screw 16 for preventing loosening, the backlash of the adjusting screw 15 can be suppressed and the moving blade 7 can be stably fixed and held. Note that the lock screw 16 may be sealed by injecting an adhesive into the screw hole, if necessary.

[Second Embodiment] FIGS. 2A to 2C show an application example of the first embodiment. In this embodiment, the support shaft 7b of the moving blade 7 and the blade angle adjusting lever 11 are shown. As a coupling means between the support shaft 7b and the adjustment lever 11 fitted to the outer periphery of the support shaft 7b, as shown in FIG.
Two wedge-shaped pressing rings 17 whose cross-sectional shape is a right triangle
And insert them in alternate directions as shown in the figure,
A fixing flange is provided on the end surface of the adjusting lever 7 so as to push the pressing ring 17 into the groove from the axial direction (a protrusion 13a protruding toward the pressing ring 17 in the circumferential groove is provided on the inner peripheral side of the flange). ) 13 and fastening bolts 14 are attached, and other structures are the same as those in the first embodiment, and the blade angle fine adjustment method of the moving blade 7 is also performed in the same manner.

With such a construction, the rotor blade 6 is initially set to the standard blade angle, and the blade angle adjusting lever 11 fitted to the support shaft 7b is arranged such that the operating legs 11a and 11b thereof are parallel to each other. When positioning is performed so as to face the front wall of the rotor hub 6, and the fastening bolt 14 is tightened in this state, the wedge-shaped pressing ring 17 pushed into the circumferential groove via the protrusion 13a of the fixed flange 13 deepens the overlapping and supports it. Axis 7
b and the adjusting lever 11 are pushed in the radial direction, and the frictional force connects the support shaft 7b and the adjusting lever 11 to each other. Therefore, according to this embodiment, the key 12 uniquely regulates the relative connecting position (circumferential connecting position) between the support shaft 7b and the adjusting lever 11 as in the key connecting system of the first embodiment. It can be changed arbitrarily without the need.

[0016]

As described above, according to the structure of the present invention, the following effects can be obtained. 1) The blade angle adjusting screw for the rotor blade is screwed on the front surface of the rotor hub, and when finely adjusting the blade angle in the assembled state of the fan with the rotor blade attached to the rotor hub, disassemble the rotor hub (remove the hub cover). It is possible to easily fine-tune the blade angle of the moving blade by simply operating the adjusting screw from outside. Therefore, it is possible to greatly improve the workability of fine adjustment of the blade angle when the blower is installed at the delivery site.

2) Further, unlike the conventional structure in which the rotor shaft is fixed to the rotor hub by directly tightening and fixing it with a nut, the blade angle adjusting lever is previously coupled to the rotor shaft. Since the adjustment blade is constrained to the adjusting position by the two adjusting screws, there is no possibility that the moving blade is unduly displaced from the blade angle adjusting position. 3) Further, by fixing the adjusting screw with the lock screw after adjusting the blade angle, unnecessary loosening of the adjusting screw can be prevented and the moving blade can be stably fixed and held at the adjusting position, thereby improving reliability.

4) By adopting a wedge-shaped pressing ring as a connecting means between the support shaft of the moving blade and the blade angle adjusting lever, the relative connecting position of the adjusting lever with respect to the moving blade is arbitrarily set and changed. It is possible to change the mounting angle of the moving blade at the time of initial setting of the blade angle according to various operating conditions of the blower.

[Brief description of drawings]

1A and 1B are diagrams showing a configuration of a blade angle adjusting mechanism corresponding to a first embodiment of the present invention, in which FIG. 1A is a sectional side view, and FIG. 1B is a view seen from an arrow R direction in FIG. End view

2A and 2B are diagrams showing a configuration of a blade angle adjusting mechanism corresponding to a second embodiment of the present invention, in which FIG. 2A is a sectional side view and FIG. 2B is a view from a direction R in FIG. End view

FIG. 3 is a side view of the overall configuration of an axial blower.

FIG. 4 is a sectional view showing a conventional blade mounting structure.

[Explanation of symbols]

 6 rotor hub 6a hub cover 7 moving blade 7a blade 7b spindle 11 blade angle adjusting levers 11a, 11b operation leg 12 key 13 fixing flange 14 fastening bolt 15 blade angle adjusting screw 16 lock screw

Claims (5)

[Claims] 1. A hollow rotor hub connected to a shaft end of a drive motor, and on its peripheral surface, a support shaft on the blade root side of each rotor blade is fixed to the rotor hub so as to support a plurality of rotor blades. In an axial blower in which blades are attached and the axially open end surface of the rotor hub is closed by a hub cover, the blade angle adjusting lever is connected to the support shaft of the rotor blade on the inner side of the rotor hub, and at the operating end of the blade angle adjusting lever. A blade angle adjusting screw is screwed on the front surface of the rotor hub by abutting the screw tip, and the blade angle adjusting screw is externally operated while the moving blade is assembled to the rotor hub. A blade angle adjusting mechanism for an axial blower, which is characterized in that the blade angle of a moving blade is adjusted. 2. The blade angle adjusting mechanism according to claim 1, wherein the blade angle adjusting lever is a ring body which is divided into two portions on the circumference to form an operating leg portion, and the end face of the operating leg portion is screwed into a rotor hub. A blade angle adjusting mechanism for an axial-flow fan, comprising a pair of operation screws facing each other, fitted and connected to a spindle of a moving blade. 3. The blade angle adjusting mechanism according to claim 2, wherein the spindle of the moving blade and the ring body of the blade angle adjusting lever are connected by using a key. Adjustment mechanism. 4. A blade angle adjusting mechanism according to claim 2, wherein a wedge-shaped pressing ring is provided in the groove between the spindle of the moving blade and the blade angle adjusting lever, and the end face of the blade angle adjusting lever is provided. A fixing flange for pushing in the pressing ring and a fastening bolt for the fixing flange are attached, and the pressing ring is pushed into the groove through the fixing flange by a fastening operation of the fastening bolt so that the spindle of the moving blade and the blade angle adjusting lever A blade angle adjusting mechanism for an axial-flow blower, which is characterized by connecting the two. 5. The blade angle adjusting mechanism according to claim 1, wherein after adjusting the blade angle, the blade angle adjusting screw is fixed with a lock screw for preventing loosening.