JPH0792078B2 - Turbo blower - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive motor mounting portion structure of a steel plate casing such as a turbo blower, and more particularly to a pipe arm structure suitable for preventing adhesion of cotton dust and the like.

[Conventional technology]

FIG. 5 shows a sectional configuration diagram of a conventional turbo blower. Reference numeral 1 is an impeller, and 4 is a motor for rotationally driving the impeller. A square rod or flat steel is used for the arm 3 to which the motor 4 is attached, and the casing 2 is formed by bolts or welding.
Fixed to. There are 3 to 4 mounting arms 3, but these are reinforcing rings 10 for the purpose of improving the strength of the arm mounting portion.
Are linked by. At this time, there is a problem that dust such as cotton dust mixed in the air adheres to the corners of the arm 3 and the reinforcing ring 10.

It is known from Japanese Utility Model Publication No. 48-59153 that the arm 3 has a pipe structure in a ventilation fan.

[Problems to be solved by the invention]

The prior art described above does not consider rubber adhesion, and there is a problem in adhesion of cotton dust particularly in the turbo blower used in the spinning machine. In addition, since the joint area of the mounting surface is small for the square rod and the flat steel, a reinforcing ring is required in terms of the strength of the arm, which causes problems in cost and appearance.

An object of the present invention is to obtain a turbo blower which can prevent dust mixed in air from adhering to an arm, can improve the strength of an arm mounting portion, and can be easily assembled.

[Means for solving problems]

In order to achieve the above object, a feature of the present invention is that a steel plate is formed around the motor to form an air intake portion of an impeller attached to a rotation shaft of the motor by disposing the motor in the central portion. In a case where a casing is provided and the motor is attached to the steel plate casing by a plurality of pipe arms, the steel plate casing to which one end of each of the pipe arms is attached matches the radius of the pipe arm, The arm fixing groove that accommodates one end and is welded and fixed, and the finishing portion that is continuous with the arm fixing groove on the opening side of the arm fixing groove and that forms a groove wider than the arm fixing groove are formed. .

[Action]

According to the above structure, since the pipe arm has no corners, it is possible to prevent the adhesion of rubber such as cotton dust.

Further, since the arm fixing groove provided on the steel plate surface of the pipe arm mounting portion facilitates the positioning of the pipe arm and can increase the joint area of the pipe arm, the strength of the mounting of the pipe arm can be significantly improved. . Even when the pipe arm is welded, since there is no clearance between the pipe arm and the arm fixing groove, the welding work for fixing can be facilitated, and the reliability of the welded portion can be improved.

Further, as described above, since the rising portion that forms a groove wider than the arm fixing groove that matches the radius of the pipe arm is formed in the steel plate frame, the other end of the pipe arm is fixed to the motor. At the time of positioning, the rising part absorbs a slight deviation of the pipe arm, so that the other end of the pipe arm and the motor mounting part can be easily positioned,
The assemblability can be improved.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional structure view of a turbo blower according to the present invention. There are 3 to 4 arms 3 for mounting the motor 4,
Pipes are used for these and are fixed to the steel plate casing 2 by welding. When the impeller 1 directly connected to the motor shaft 5 rotates, the centrifugal force of the impeller 1 causes an air flow 7
Is passed from the motor 4 side through the steel plate casing 2 into the impeller 1 where it is pressurized and released to the atmosphere. At this time, a pipe structure without corners is adopted so that dust such as cotton dust mixed in the air does not adhere to the arm 3 facing the air inflow passage.

2 to 4 show a casing according to the invention,
The drawing is this plan view, FIG. 3 is the sectional view taken along the line AB--B '-O in FIG. 2, and FIG. 4 is the sectional view taken along the line C--C'.

As shown in FIGS. 2 to 4, a groove 8 having the radius of the pipe used for the arm 3 is provided on the casing surface of the mounting portion of the pipe arm 3, and the pipe arm 3 is set in this groove to set the pipe 3 and the groove portion. Weld both ends in contact with each other. Since the pipe 3 is guided by the groove 8 provided in the casing 2 as shown in FIG. 4, the welding work of the D portion is facilitated and the quality is improved. Compared to a flat surface when a square bar or flat steel is used, since it is a round surface, the joint area is enlarged, and a rising portion 9 is provided to escape from the joint surface between the groove 8 of the casing 2 and the pipe 3 to the outside of the pipe. As a result, the strength of the mounting portion can be improved. As a result, conventionally, in the case of a square bar or flat steel arm structure, a reinforcing ring was required to increase the strength of the mounting part, but the adoption of a pipe arm structure eliminates the need for a reinforcing ring and makes the appearance neat and clean. I was able to improve the value. Further, by providing the rising portion 9, the positioning for fixing the pipe arm 3 to the motor 4 (the rising portion 9 absorbs a slight deviation of the pipe arm 3) becomes easy. In addition, F is a welded portion for fixing the reinforcing plate 6 and the casing 2 to each other.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the arm facing the air flow has no corners, and rubber such as cotton dust can be prevented from adhering, and the strength of the arm mounting portion is improved so that the reinforcing ring is not necessary. The cost can be reduced, and the product value can be improved with a neat appearance.

Furthermore, according to the present invention, since the rising portion that forms a groove wider than the arm fixing groove is formed in the steel plate frame, during alignment for fixing the other end of the pipe arm to the motor, Since the rising portion absorbs a slight deviation of the pipe arm, the other end of the pipe arm and the motor mounting portion can be easily aligned with each other, and the assembling property can be improved.

[Brief description of drawings]

FIG. 1 is a sectional structural view showing an embodiment of the blower of the present invention. FIG. 2 is a plan view showing an example of a casing adopting the pipe structure according to the present invention. FIG. 3 is a sectional view taken along the line A-B-B'-O in FIG. FIG. 4 shows a sectional view taken along the line C-C 'in FIG. FIG. 5 shows a sectional structural view of a conventional blower. 1 ... Impeller, 2 ... Casing, 3 ... Motor mounting arm, 4 ... Motor, 5 ... Motor shaft, 6 ... Reinforcing plate, 7 ... Air flow, 8 ... Groove with radius R of pipe , 9 ...
… Casing upright, 10… Reinforcement ring.

Claims (1)

[Claims] 1. A steel plate casing is provided around the motor to form an air suction portion of an impeller attached to a rotation shaft of the motor by disposing the motor in a central portion, and the motor is constituted by a plurality of pipe arms. In the case of being attached to the steel plate casing, the steel plate casing to which one end of each of the pipe arms is attached has an arm fixing groove that matches the radius of the pipe arm and accommodates one end of the pipe arm by welding. The turbo blower is characterized in that a rising portion is formed which is continuous with the arm fixing groove on the opening side of the arm fixing groove and forms a groove wider than the arm fixing groove.