JP6178545B2 - Impeller manufacturing method - Google Patents

Description

The present invention also relates to the production how of the impeller.

  An impeller used in a compressor or the like is generally provided with a hub having a diameter that gradually decreases in one direction of an axis, and a hub surface that is inclined to the hub, and is inclined to one side in the circumferential direction and is circumferentially provided. A plurality of blades arranged at predetermined intervals.

  When manufacturing an impeller having such a shape, a multi-axis machine tool is used to cut out a block-shaped material (see Patent Document 1 below).

JP 2010-269417 A

  However, when a multi-axis machine tool is used, the machining time is long and not only the production efficiency is poor but also the cost is high. Therefore, it is conceivable to mold the impeller by injection molding or the like. However, when the inclined blade covers the hub surface, the mold release structure is poor, and the mold structure is complicated for smooth release. And cost increases.

In view of the above, the present invention aims to provide a manufacturing how the impeller can be manufactured impeller efficiently low cost.

In order to achieve such an object, the present invention includes a hub and a plurality of blades provided on the hub surface of the hub, which are inclined to one side in the circumferential direction and arranged at predetermined intervals in the circumferential direction. In the impeller manufacturing method provided, a blade forming step for forming the blade, a hub forming step for forming the hub, and each blade formed by the blade forming step at a predetermined angle with respect to the axial direction of the rotation shaft. And a connecting step of connecting the hub and each blade, and in the blade forming step, the annular connecting portion and the connecting portion are integrated with a predetermined interval. A blade coupling body composed of a plurality of connected blades is molded, and in the hub molding step, a hub having a fitting portion for fitting the coupling portion of the blade coupling body is molded, and the coupling is performed. The posture of each blade of the blade coupling body is changed so as to have a predetermined inclined posture that is inclined with respect to the axial direction of the rotation shaft rather than the posture when the blade is formed in the blade forming step. a blade inclined step of, characterized Rukoto a fitting step of fitting the coupling portion of the blade connecting body in the fitting portion of the hub.

  According to the present invention, since the blade is molded by the blade molding process and the hub is molded by the hub molding process, when the blade and the hub are molded by injection molding or the like, the mold can be smoothly released from the mold. The structure is not complicated. Thereby, an impeller can be manufactured at low cost.

  By forming the blade coupling body in the blade forming step, the joining step can be performed in a state where the blades arranged at a predetermined interval are connected by the connecting portion, and the blade is placed at a predetermined position on the hub surface. The impeller can be manufactured more efficiently than the operation of sequentially connecting the blades one by one.

  Further, in the blade tilting step of the coupling step, the blades connected to the connecting member are tilted, so that the blades can be in a tilted posture without shifting their positions, and in the fitting step Since the connecting portion is fitted to the fitting portion, each blade can be positioned very easily. Therefore, an impeller can be manufactured efficiently.

  Further, in the present invention, a blade having a convex portion is formed on a coupling surface of the blade to the hub surface by the blade molding step, and a concave portion corresponding to the convex portion of the blade is formed on the hub surface by the hub molding step. The hub is provided, and the coupling step includes an engaging step of engaging the convex portion of the blade with the concave portion of the hub surface.

  According to this, since each blade can be coupled to the hub very easily only by engaging the convex portion of the blade with the concave portion of the hub surface in the coupling step, the impeller can be manufactured efficiently.

The perspective view which shows the impeller of embodiment of this invention. The disassembled perspective view which shows the structure of the impeller of this embodiment. Explanatory sectional drawing which shows the convex part of a braid | blade, and the recessed part of a hub. The top view which shows the shaping | molding state of a blade coupling body. An explanatory plan view showing assembly of a blade to a hub. The explanatory perspective view which shows the assembly | attachment of the braid | blade to the hub using an assembly jig. Explanatory drawing which shows the braid | blade and hub of other embodiment.

  Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the impeller 1 of the present embodiment includes a hub 2 and a plurality of blades 3. The hub 2 includes an inclined hub surface 4 on the outer peripheral surface thereof. Each blade 3 is provided on the hub surface 4 with a predetermined interval in a posture inclined to one side in the circumferential direction.

  As shown in FIG. 2, the impeller 1 includes two members, a hub 2 and a blade coupling body 5. The hub 2 is formed in a substantially conical shape that gradually decreases in diameter toward one direction (upward in the drawing) of the rotation axis x. The blade coupling body 5 includes an annular coupling portion 6 and a plurality of blades 3 that are integrally coupled to the coupling portion 6 at a predetermined interval.

  A convex portion 7 is provided at the lower end of each blade 3. A fitting portion 8 for fitting the connecting portion 6 of the blade connecting body 5 is formed at the upper end portion of the hub 2, and the convex portions 7 of the blades 3 are respectively engaged with the lower end portion of the hub surface 4. A plurality of recesses 9 to be combined are formed.

  As shown in FIG. 3, the recess 9 of the hub 2 is formed to be recessed in the direction of the rotation axis x. On the other hand, the convex portion 7 of the blade 3 protrudes at a predetermined angle with respect to the blade 3 so that the blade 3 assumes a predetermined inclined posture when inserted and engaged with the concave portion 9 of the hub 2. Yes. As a result, the blade 3 is simply inserted into the concave portion 9 by moving the blade 3 along the rotation axis x (vertically downward in the figure) by directing the convex portion 7 in the insertion direction into the concave portion 9. It becomes a predetermined inclination posture.

  Although not shown, it is possible to form the concave portion of the hub 2 at an angle corresponding to the inclined posture of the blade 3, contrary to that shown in FIG. 3. However, in this case, the convex portion of the blade 3 must be inserted obliquely along the concave portion. Therefore, as in the present embodiment shown in FIG. 3, the convex portion 7 is projected with a predetermined angle with respect to the blade 3, and the concave portion 9 is recessed in the direction of the rotation axis x of the hub 2. It is preferable to keep the engagement work easier.

  Next, a method for manufacturing the impeller 1 having the above configuration will be described. First, as shown in FIG. 2, the blade connector 5 and the hub 2 are individually molded. That is, the blade coupling body 5 is injection-molded using a synthetic resin as a material and an injection mold for blades (not shown) (blade molding process), and the synthetic resin is used as a hub and an injection mold for hubs (not shown). The hub 2 is injection molded (hub molding process).

  At this time, as shown in a plan view in FIG. 4, the blade coupling body 5 is molded in a posture in which each blade 3 stands in the vertical direction. By doing so, the blade assembly 5 can be easily released from the mold, and the mold structure is not complicated, and can be molded efficiently at low cost.

  Next, as shown in FIG. 5A, the positions of the connecting portion 6 of the blade connecting body 5 and the fitting portion 8 of the hub 2 are aligned, and the blade connecting body 5 is opposed to the upper side of the hub 2. Subsequently, as shown in FIG. 5B, each blade 3 is tilted at a predetermined angle (blade tilting step). At this time, each blade 3 is connected by the connecting portion 6, so that the displacement of each blade 3 is prevented. Then, the coupling portion 6 of the blade coupling body 5 is fitted into the fitting portion 8 of the hub 2 (fitting process), the lower edge of each blade 3 of the blade coupling body 5 is seated on the hub surface 4, and each projection The part 7 is engaged with each recess 9 of the hub surface 4 (engagement step). Thereby, each blade 3 is couple | bonded with the hub 2 (joining process). Also at this time, since the blades 3 are maintained in the state of being connected by the connecting portions 6, the blades 3 are reliably positioned at a predetermined distance from each other, and the connecting work to the hub 2 is easy. Yes. Further, as described above, the convex portions 7 of the respective blades 3 are projected at a predetermined angle with respect to the blade 3, so that the convex portions 7 of the respective blades 3 are merely engaged with the concave portions 9 of the hub 2. Each blade 3 is in a predetermined inclined posture.

  In addition, before performing the operation | work which inclines each braid | blade 3 to a predetermined angle by a blade inclination process, it may be made to fit the connection part 6 of the blade coupling body 5 to the fitting part 8 of the hub 2 by a fitting process. Good. In this case, the connecting portion 6 of the blade connecting body 5 is fitted into the fitting portion 8 of the hub 2 and each blade 3 is positioned, and each blade 3 is inclined at a predetermined angle. The convex portion 7 of each blade 3 can be engaged with the concave portion 9 of the hub surface 4. In addition, an adhesive may be applied to the lower edge of each blade 3 in advance, whereby a strong bonded state can be obtained.

  Here, when the blades 3 are coupled to the hub 2, as an example, as illustrated in FIGS. 6A to 6C, a joining jig 10 may be used.

  As shown in FIG. 6A, the joining jig 10 includes a first frame 11 and a second frame 12 that is rotatable with respect to the first frame 11. A columnar holding shaft 13 extending downward is fixed to the center of the first frame 11, and a plurality of first contact bars 14 extending downward are provided at predetermined intervals on the periphery of the first frame 11. It is fixed. The second frame 12 is formed in a disc shape, and a plurality of second contact rods 15 extending downward are fixedly provided at the periphery of the second frame 12 at a predetermined interval. The lower end portion of the first contact rod 14 and the lower end portion of the second contact rod 15 are bent at an angle along a predetermined inclined posture of the blade 3.

  Then, as shown in FIG. 6B, the connecting portion 6 of the blade connecting body 5 is attached to the holding shaft 13. At the same time, the first contact bar 14 is positioned along one side surface of the blade 3 (the surface that is inclined to face the hub surface 4), and the second contact bar 15 is positioned along the other side surface of the blade 3. Next, the first frame 11 is rotated with respect to the second frame 12. Thereby, the blade 3 is sandwiched between the first contact rod 14 and the second contact rod 15, and the blade coupling body 5 is connected to the first frame 11 and the second frame in a state where the blade 3 is in a predetermined inclined posture. The frame 12 is held.

  Subsequently, as shown in FIG. 6C, the blade coupling body 5 held by the first frame 11 and the second frame 12 is seated on the hub surface 4 and joined. Thus, by using the joining jig 10, the blade 3 and the hub 2 can be coupled very smoothly, and the impeller 1 can be easily manufactured.

  As shown in FIG. 7 (a), a key 16 protruding inside the connecting portion 6 of the blade connecting body 5 is provided and connected to the fitting portion 8 of the hub 2 as shown in FIG. 7 (b). A key groove 17 corresponding to the key 16 of the portion 6 may be provided. By doing so, it is very easy to align the blade assembly 5 with respect to the hub 2 prior to the connection between the blade 3 and the hub 2.

  In the above embodiment, the projections 7 are provided on the blades 3 and the recesses 9 are provided on the hubs 2. However, for example, an adhesive is applied to the lower edge of each blade 3 in advance. When bonding to the surface 4, the convex portion 7 and the concave portion 9 may not be provided.

  x: rotation axis (axis), 1 ... impeller, 2 ... hub, 3 ... blade, 4 ... hub surface, 5 ... blade coupling body, 6 ... coupling portion, 7 ... convex portion, 8 ... fitting portion, 9 ... concave portion .

Claims (2)

In a method of manufacturing an impeller comprising a hub and a plurality of blades provided on the hub surface of the hub and inclined at one side in the circumferential direction and arranged at predetermined intervals in the circumferential direction,
A blade forming step for forming the blade;
A hub molding step of molding the hub;
Each of the blades formed by the blade forming step is inclined to a predetermined angle with respect to the axial direction of the rotating shaft and is seated on the hub surface, and the hub and the blades are connected to each other.
In the blade forming step, a blade connecting body is formed which includes an annular connecting portion and a plurality of blades integrally connected to the connecting portion at a predetermined interval;
In the hub forming step, a hub including a fitting portion for fitting the connecting portion of the blade connector is formed,
In the joining step, the posture of each blade of the blade coupling body is set to a predetermined inclined posture that is inclined with respect to the axial direction of the rotation shaft rather than the posture when the blade is formed in the blade forming step. An impeller manufacturing method comprising: a blade inclination step to be changed; and a fitting step in which a coupling portion of the blade coupling body is fitted into the fitting portion of the hub. In the blade molding step, a blade having a convex portion is formed on the coupling surface of the blade to the hub surface,
In the hub forming step, a hub having a concave portion corresponding to the convex portion of the blade is formed on the hub surface,
The impeller manufacturing method according to claim 1, wherein the coupling step includes an engagement step of engaging a convex portion of the blade with a concave portion of the hub surface.

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