JP4584628B2 - Manufacturing method of vortex blower - Google Patents

Description

  The present invention relates to a vortex blower, and more particularly to the structure of an impeller thereof.

  Conventionally, in an eddy current blower, a plurality of blades having a concave curved surface inclined at a predetermined angle with respect to a rotating shaft are provided in an annular casing in order to meet demands for reduction in size, weight, pressure, and noise. Impellers are used. In manufacturing the impeller, a plurality of blades having a concave curved surface (hereinafter referred to as a three-dimensional blade) and the annular casing are separately manufactured, and after the manufacture, the three-dimensional blade is formed into the annular shape. There are a method of fixing to a casing at a predetermined interval, a method of integrally forming a wheel, a plurality of blades (blades) and a hub with a mold, and combining a separately manufactured hub compensator. References describing the structure and manufacturing technique of the conventional three-dimensional blade include, for example, Japanese Patent No. 2680136 (Patent Reference 1) and Japanese Patent Laid-Open No. 6-272692 (Patent Reference 2).

Japanese Patent No. 2680136

JP-A-6-272692

Of the above-described conventional techniques, the technique of separately manufacturing the three-dimensional blade and the casing requires time and labor to assemble and adjust the impeller after each manufacture. Since there is no through space in the rotational axis direction between the three-dimensional blades, it is difficult to manufacture the three-dimensional blade itself by molding or the like. In addition, the technology that combines the hub compensator with the wheel, blades, and hub integrated into one piece complicates the structure of the mold, as well as the assembly time and adjustment for combining the hub compensator. I need time.
An object of the present invention is to make it possible to easily form an impeller integrally with a vortex blower, such as using a simple structure, and to eliminate the need for a combination with a hub compensator, etc. It is to be.
The objective of this invention is providing the impeller structure which can solve this subject and can improve productivity.

In order to solve the above problems, in the present invention, the vortex blower accelerates the fluid flowing in from the stationary flow path by the rotation of the first casing portion that forms a stationary flow path having an annular concave cross section in a fixed state. An impeller that flows out into the stationary flow path, and a cover portion that covers a side surface of the impeller in a fixed state that is opposite to the stationary flow path side. A second casing portion, a plurality of blades having a curved surface disposed on an inner peripheral side of the second casing portion and inclined at a predetermined angle with respect to the rotation shaft, and the plurality of blades fixed to the rotation shaft. A wheel portion that is supported at a position closer to the first casing portion than a position of the end surface of the blade in the rotation axis direction, and the plurality of blades penetrates along the rotation axis direction to the stationary flow path. Is it a continuous space, The cover part, when the inner surface has an inner surface of the vertical straight plane to the axis of rotation of the impeller is configured facing the end surface of the blade, the spatial portion to form the second casing portion Using a mold having a configuration in which a space portion forming a plurality of blades and a space portion forming the wheel portion are continuous, a molding material is poured into the continuous space portion of the mold, and the second casing portion, A plurality of blades and the wheel portion are integrally formed to manufacture the impeller, and the side surface of the manufactured impeller and the cover portion are opposed to each other, and the opposed portion is sealed. To manufacture.

  According to the present invention, the impeller can be formed integrally with a simple mold, and the productivity of the impeller or the vortex blower using the impeller can be improved.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.
1-4 is explanatory drawing of the 1st Embodiment of this invention. 1A and 1B are configuration examples of a vortex blower according to a first embodiment of the present invention, in which FIG. 1A is a perspective view, FIG. 1B is a cross-sectional view of a main portion in a rotation axis direction, and FIG. FIG. 3 is a cross-sectional view of a main part in a direction perpendicular to the rotation axis of the vortex blower of FIG. 1, and FIG. 4 is a cross-sectional configuration of the impeller side surface portion and the cover portion in the vortex blower of FIG. It is an example figure.

  In FIG. 1, 1 is an induction motor that rotationally drives an impeller, 2 is a rotary shaft, 3 is a fixed casing as a first casing part, 4 is a stationary flow path of the fixed casing 3, and 5 is a vortex blower. The impeller 5a is a blade casing of the impeller 5 as a second casing part, 5b is a blade of the impeller 5, 5c is a wheel part of the impeller 5, and 6 is a side part as a cover part of the vortex blower. A cover 7 is a sound absorber.

  The fixed casing 3 is provided in a fixed state in the vortex blower, and forms an annular stationary flow path 4 concentric with the rotating shaft 2 at the outer peripheral portion thereof. The blade casing 5a has an annular structure and is rotated by the rotating shaft 2 together with the blade 5b and the wheel portion 5c. The blade 5b is composed of a plurality of blades (three-dimensional blades) disposed on the inner peripheral side of the blade casing 5a and having a curved surface inclined by a predetermined angle γ with respect to the rotary shaft 2. The wheel portion 5c is fixed to the rotating shaft 2 and supports the plurality of blades. A space between the plurality of blades penetrates along the direction of the rotary shaft 2 and is a space that continues to the stationary flow path 4 of the fixed casing 3. The side cover 6 is disposed in a fixed state so as to face the side surface of the blade casing 5a of the impeller 5, covers the portion of the space opposite to the stationary flow path 4, and forms a side wall with respect to the space. A fluid flow path is formed in the space together with the blade 5b. The penetrating space between the plurality of blades is provided so that the impeller 5 can be integrally formed with a simple configuration mold. A space between the side cover 6 and the side surface of the impeller 5 including the side surface of the blade casing 5a is a seal configuration that suppresses fluid leakage.

Hereinafter, the components of the vortex blower of FIG. 1 used in the description of FIGS.
2 is a configuration diagram of the impeller 5 used in the vortex blower of FIG. 1, (a) is a configuration when the impeller 5 is viewed from the side cover 6 side, and (b) is a stationary flow of the fixed casing 3. This is a configuration when viewed from the road 4 side.

  In FIG. 2, 5 d is a through space that passes between the blades 5 b and is provided along the direction of the rotating shaft 2, 11 is a fluid that flows from the stationary flow path 4 of the fixed casing 3 to the blade 5 b side, and 12 is The fluid flows out from the blade 5 b side to the stationary flow path 4 of the fixed casing 3. The through space 5d is formed continuously with the stationary flow path 4 of the fixed casing 3 on the fixed casing 3 side, and on the side of the side cover 6 (not shown), the inner surface of the side cover 6 forms a side wall, thereby expanding. Limited. The fluid 11 that has flowed into the blade 5b from the stationary flow path 4 passes through the through space 5d between the blades 5b, proceeds to the fixed side cover 6 side while being accelerated by the rotating blade 5b, and the side cover 6 The travel is blocked by the inner surface, and again passes through the through space 5d and is accelerated by the blade 5b, then flows out from the blade 5b side and flows into the stationary flow path 4. When the fluid flows into the blade 5b, it enters from the inner peripheral side of the impeller, flows in a curved shape within the blade 5b, is accelerated by centrifugal force, and flows out to the outer peripheral side of the impeller.

  By providing the penetrating space 5d, the impeller 5 can be integrally formed with a simple configuration mold. As a means for manufacturing the impeller 5 by a mold, there are die casting and other casting techniques. In manufacturing the impeller 5, for example, as the mold, the space portion forming the blade casing 5a, the space portion forming the plurality of blades 5b, and the space portion forming the wheel portion 5c are continuous, A molding material such as molten metal is poured into the space portion to integrally form the impeller 5 including the blade casing 5a, the plurality of blades 5b, and the wheel portion 5c. Removal of the mold after the formation is easy because the mold structure has a structure corresponding to the through space 5d.

FIG. 3 is a cross-sectional view of a main part in a direction perpendicular to the rotation axis of the vortex blower of FIG.
In FIG. 3, each of the plurality of blades 5b has a curved surface inclined at a predetermined angle γ with respect to the rotation axis direction. The angle γ is an angle that can increase the pressure coefficient (a dimensionless amount representing work per unit impeller outer diameter) and suppress fluid flow disturbance. The fluid flows into the through space 5d between the plurality of blades 5b from the stationary flow path 4 side of the fixed casing 3 at an angle substantially equal to the angle γ and also flows out to the stationary flow path 4 side. It flows out from the side at an angle substantially equal to the angle γ.

FIG. 4 is a diagram illustrating a cross-sectional configuration example of a facing portion between the side surface portion of the impeller 5 and the side cover 6 in the vortex blower of FIG. 1. (A) is the case where the inner surface of the side cover 6 is made to face the side surface of the blade casing 5a and the end surface of the blade 5b, and (b) is provided with a sealing material 20 on the side surface of the blade casing 5a, This is a case where the material 20 is brought into contact with the facing surface of the side cover 6. In either case, the facing portion between the rotating impeller 5 and the fixed side cover 6 is sealed, and the fluid accelerated in the impeller 5 is prevented from leaking from the facing portion. By suppressing the fluid leakage, a decrease in fluid pressure in the impeller 5 is suppressed.

In FIG. 4A, the gap dimension δ ₁ of the facing portion between the blade casing 5a of the rotating impeller 5 and the fixed side cover 6 and the facing portion of the blade 5b of the impeller 5 and the side cover 6 are opposed. both of pore size [delta] _2, and a small size enough to suppress the leakage of fluid from the impeller within 5, for sealing the fluid between the impeller 5 and the side cover 6.

In FIG. 4B , the gap dimension δ ₁ between the blade casing 5 a of the impeller 5 and the side cover 6 and the gap dimension δ ₂ between the blade 5 b of the impeller 5 and the side cover 6. The blade casing 5a has a sealing material 20 at the portion facing the side cover 6, and the blade casing 5a and the side cover 6 are separated from each other. Seal the fluid between. For example, a resin material is used as the sealing material 20. In this configuration, the sealing material 20 provided on the blade casing 5 a slides on the inner surface of the side cover 6 by the rotation of the impeller 5. In this configuration, the portion of the gap dimension δ ₁ at the facing portion between the side surface of the impeller 5 and the side cover 6 is closed by the sealing material 20, so that the sealing function can be further improved from this point.

  According to the first embodiment of the present invention described in FIG. 1 to FIG. 4, the impeller 5 can be integrally formed by die casting or the like using a die having a simple configuration. Productivity of the vortex blower used can be improved. In addition, a fluid seal between the impeller 5 and the side cover 6 is ensured, and a decrease in fluid pressure in the impeller 5 is also suppressed.

  FIG. 5 is a configuration example diagram of an impeller as a second embodiment of the present invention. Also in the description of FIG. 5, the same reference numerals as those in the case of the vortex blower shown in FIG. The impeller 5 of the second embodiment is coupled to a blade 5b and a blade casing 5a at a portion facing the side cover 6 and extends in a direction substantially perpendicular to the rotary shaft 2, and is partially fluidized at the portion. This is an example in the case of having a portion for forming a flow path (hereinafter referred to as a partial flow path forming portion). FIG. 5 shows a state in which a part of the blade casing 5a is removed in order to show the configuration inside the impeller 5.

  In FIG. 5, 5 d is a penetrating space that passes between the blades 5 b and is provided along the direction of the rotary shaft 2, and 5 e is a blade 5 b and a blade casing on the side facing the side cover 6 of the impeller 5. This is a partial flow path forming part that is coupled to 5a and extends in a direction substantially perpendicular to the rotation axis 2 to form a partial side wall of the through space 5d and partially form a fluid flow path. As in the case of the first embodiment, the through space 5d is formed continuously to the stationary flow path 4 of the fixed casing 3 on the fixed casing 3 side, and the partial flow path forming portion 5e on the side cover 6 side. And the inner surface of the side cover 6 are limited.

The configuration of the vortex blower using the impeller 5 of the second embodiment is basically the same as that of the first embodiment. For example, in the configuration of FIG. 1, the impeller of FIG. There is a configuration to use. In the vortex blower, the fluid 11 flowing into the blade 5b from the stationary flow path 4 passes through the through space 5d between the blades 5b and is accelerated by the rotating blade 5b while the partial flow path forming portion 5e and After proceeding to the fixed side cover 6 side, the forward flow is blocked by the partial flow path forming portion 5e and the inner surface of the side cover 6, and again accelerated through the through space 5d by the blade 5b, It flows out from the blade 5b side and enters the stationary flow path 4. When the fluid flows into the blade 5b, it enters from the inner peripheral side of the impeller, flows in a curved shape within the blade 5b, is accelerated by centrifugal force, and flows out to the outer peripheral side of the impeller.
In the vortex blower, a seal structure that suppresses fluid leakage between the impeller 5 and the side cover 6 has, for example, the configuration shown in FIG.

  Also according to the second embodiment of the present invention, the impeller 5 can be integrally formed by die casting or the like using a die having a simple configuration, and the productivity of the impeller 5 or a vortex blower using the impeller 5 is improved. Can be made. In addition, fluid leakage between the impeller 5 and the side cover 6 can be suppressed, and a decrease in fluid pressure in the impeller 5 can be suppressed.

It is a structural example figure of the vortex blower as the 1st Embodiment of this invention. It is a block diagram of the impeller used for the eddy current blower of FIG. It is principal part sectional drawing of the direction orthogonal to the rotating shaft of the vortex | eddy_current blower of FIG. It is a cross-sectional block diagram of the impeller side part in the vortex | eddy_current blower of FIG. It is a structural example figure of the impeller as the 2nd Embodiment of this invention.

Explanation of symbols

1 ... induction motor,
2 ... Rotation axis,
3 ... fixed casing,
4 ... static flow path,
5 ... impeller,
5a ... blade casing,
5b ... blade,
5c: Wheel part,
5d ... through space,
5e ... Partial flow path forming part,
6 ... Side cover,
7 ... Sound absorber.

Claims (4)

A method of manufacturing a vortex blower that forms an accelerated flow of fluid by rotation of an impeller,
A first casing portion in which the vortex blower forms a stationary flow path having an annular concave cross section in a fixed state; and an impeller for accelerating a fluid flowing from the stationary flow path by rotation to flow out to the stationary flow path A cover portion that covers a side surface of the impeller in a fixed state opposite to the stationary flow path side. The impeller includes an annular second casing portion and the second casing portion. A plurality of blades having a curved surface arranged on an inner peripheral side of the casing portion and inclined at a predetermined angle with respect to the rotation axis; and the plurality of blades fixed to the rotation axis are positioned at a position higher than an end surface position of the plurality of blades in the rotation axis direction. and a wheel unit which supports at the position of the first casing portion closer, the mutual multiple blades, is a penetrating along the rotation axis direction continuous space in said stationary flow channel, and said cover portion , rotation of the impeller A structure in which the inner surface facing the end surface of the blade has an inner surface of the vertical straight plane,
Using a mold having a configuration in which a space portion forming the second casing portion, a space portion forming the plurality of blades, and a space portion forming the wheel portion are continuous, molding into the continuous space portion of the mold Pour material, and form the impeller by integrally forming the second casing part, the plurality of blades and the wheel part,
A method of manufacturing a vortex blower, characterized in that the vortex blower is manufactured by making a side surface of the manufactured impeller and the cover portion face each other and sealing the facing portion.   2. The method of manufacturing an eddy current blower according to claim 1, wherein when the impeller is manufactured, the mold is removed after forming the integrated second casing portion, the plurality of blades, and the wheel portion.   When the side surface of the impeller manufactured and the cover portion are opposed to each other and the facing portion is sealed, the inner surface of the flat surface of the cover portion is opposed to the side surface of the second casing portion and the end surface of the blade. The manufacturing method of the eddy current blower of Claim 1. The sealing member is provided on the side surface of the blade when the side surface of the manufactured impeller is opposed to the cover portion and the facing portion is sealed, and the sealing material is brought into contact with the opposing surface of the cover portion. The manufacturing method of the eddy current blower described in 1.

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