JP6091072B2 - Rotating body and impeller - Google Patents

Description

The present invention relates to a rotating body and an impeller that include a plurality of blades extending radially about a rotation axis and rotate around the rotation axis .

  Examples of this type of rotating body include impellers used in compressors, pumps, and the like. The impeller is provided with a plurality of blades around a shaft insertion portion into which a rotation shaft for transmitting a rotational driving force is inserted. In recent years, a high-performance impeller has been demanded, and accordingly, the blade shape is inclined and curved with respect to the rotation axis, and a part of blades adjacent to each other has a shape overlapping when viewed from the axial direction. Impellers are manufactured.

  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 low but also the cost is high.

  Therefore, it is conceivable to divide the impeller into a plurality of parts, simplify the shape of each part, and manufacture the impeller by joining the parts formed by, for example, injection molding. However, according to this, since the operation | work which assembles | attaches and joins each component is required, an operation man-hour increases. Moreover, an impeller formed by joining a plurality of parts with pre-divided shapes may not be able to maintain a strong joined state due to stress concentration at the joints between the parts. There is an inconvenience.

In view of the above points, an object of the present invention is to provide a rotating body and an impeller that are not only extremely easy to manufacture but also have high strength.

In order to achieve the above object, a rotating body according to the present invention is a rotating body that includes a plurality of blades extending radially about a rotation axis , and rotates around the rotation axis. A connecting portion formed by connecting the first member and the second member of each shape divided in the rotation axis direction, connected to the dividing surface of the first member, and extending in the rotation axis direction; A claw portion formed on one side surface of the connecting portion and projecting in a direction intersecting the rotation axis; a hook portion formed on the second member and hooked by the claw portion; and the hook portion An abutting member that abuts the side surface of the connecting portion opposite to the protruding side of the claw portion so as to maintain the hooked state of the claw portion with respect to the connecting portion. Formed in a shape having a warp in a direction away from the portion, the contact member to the connecting portion Contact by wherein the claw portion warpage of the connecting portion is corrected is hooked to the hook portion.

  According to the present invention, the first member and the second member are formed by connecting the first member and the second member having a shape obtained by dividing the rotating body in the rotation axis direction through a predetermined dividing surface. Since it connects only by latching the nail | claw part of a connection part to a latching part, manufacture is easy compared with the case where a multi-axis machine tool is used, and a low-cost rotary body can be provided.

  By the way, when hooking a claw part on a latching part, it is common to use the elasticity of a connection part. That is, until the claw part is hooked on the hooking part, the connecting part is elastically bent, and when the claw part is opposed to the hooking part thereafter, the hooking part is locked by elastic recovery of the connecting part. Hang on the part. However, for example, when the total length of the connecting portion (the length from the root end on the dividing surface side of the first member to the tip in the extending direction) is relatively short and sufficient deflection over the entire length cannot be obtained, There is a possibility that stress concentrates on the root end of the connecting portion until the portion is hooked on the hooking portion and breaks from the root end of the connecting portion.

On the other hand, according to the present invention, since the connecting portion is formed with a warp in advance, almost no stress is applied to the base end of the connecting portion until the claw portion is hooked on the hooking portion. Do not concentrate. Thereby, the break at the base end of the connecting portion can be reliably prevented. And when the claw portion is in a state of facing the latching portion, the abutting member abuts on the coupling portion and corrects the warpage of the coupling portion, so that the claw portion can be easily latched on the latching portion. It can be made into a firm latching state. By obtaining such a hooked state, it is possible to provide a rotating body with high strength.

  In the present invention, a plurality of the connecting portions are arranged at equal intervals in a circumferential direction concentric with the rotation axis. According to this, a strong connection state between the first member and the second member can be obtained without hindering the rotation accuracy of the rotating body, and stress during rotation around the rotation axis is evenly distributed to the plurality of connection portions. Since it is dispersed, a highly durable rotating body can be provided.

In order to achieve the above object, the impeller of the present invention includes a plurality of blades extending radially about the rotation axis, and when adjacent to each other, the blades adjacent to each other when viewed in plan with one of the rotation axis directions as an upper side. some are formed so as to overlap vertically, a impeller rotated about the rotation axis, a first member and a second member in the form of respective divided in the rotation axis direction through a predetermined dividing plane A connection part formed to be connected to the dividing surface of the first member and extending in the direction of the rotation axis, and a direction formed on one side surface of the connection part and intersecting the rotation axis A claw protruding to the hook, a hook formed on the second member and hooked by the hook, and the hook of the connecting portion to maintain the hook of the hook against the hook The abutting member that abuts on the side opposite to the protruding side of The connecting portion is formed in advance in a shape having a warp in a direction in which the claw portion is separated from the hooking portion, and the warping of the connecting portion is caused by the contact of the contact member with the connecting portion. The claws are corrected and the hooks are hooked on the hooks, and each of the first member and the second member is arranged such that the blades adjacent to each other do not overlap each other when viewed in plan. And when the first member and the second member are connected, the dividing surface is arranged such that at least a part of each blade of the second member overlaps above each blade of the first member. It is characterized by being set.

  The impeller as a rotating body of the present invention has a shape having a plurality of blades in which a part of blades adjacent to each other overlaps each other. At this time, by setting the dividing surface as described above, for example, each blade of the second member to be injection-molded can be made relatively large, and the mold shape can be improved and the mold shape can be simplified. And cost can be reduced. On the other hand, as described above, the claw portion of the connecting portion is hooked on the hooking portion, so that a reliable connection state is obtained. Therefore, according to the present invention, it is possible to provide an impeller that is inexpensive and has high strength.

The perspective view which shows the impeller of embodiment of this invention. Explanatory sectional drawing of the impeller of this embodiment. The top view of the 2nd member of this embodiment. Explanatory sectional drawing of the decomposition | disassembly state of the impeller of this embodiment. Explanatory drawing which shows the connection operation | work of the 1st member and 2nd member of this embodiment.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the impeller 1 as a rotating body of the present embodiment includes a shaft insertion portion 3 into which the rotation shaft 2 is inserted, and a plurality of blades 4 extending radially from the shaft insertion portion 3. ing. The rotating shaft 2 is coupled to a rotating power source such as a motor (not shown). The blades 4 are arranged at a predetermined interval in the outer peripheral direction of the shaft insertion portion 3. Furthermore, each blade 4 has a shape that is inclined and curved with respect to the direction of the rotation axis x, and is formed in a shape in which a part of adjacent ones overlaps each other when viewed in plan.

  As shown in FIG. 2, the impeller 1 of the present embodiment includes a first member 5 constituting a lower half part and a second member 6 constituting an upper half part, and the first member 5, the second member 6, and the like. The boundary surface that is in contact with is the dividing surface 7 when the impeller 1 is divided in the direction of the rotation axis x.

  Further, as shown in FIG. 3, the second member 6 constituting the upper half portion has a shape in which the blades 4b adjacent to each other do not overlap each other when viewed in plan. The 1st member 5 which comprises a lower half part is also made into the shape where the blade | wings 4a adjacent to each other do not overlap up and down when it planarly views with reference to FIG.

  When the first member 5 and the second member 6 are connected and the divided surfaces 7 are brought into contact with each other, as shown in FIG. 1, the impeller is composed of the blade 4a of the first member 5 and the blade 4b of the second member. 1 is formed. When viewed in plan in this state, a part of the blade 4b of the second member 6 overlaps a part of the blade 4a of the first member 5.

  As shown in FIG. 4, the first member 5 includes a plurality (four in the present embodiment) of connecting portions 8 having the same shape and extending upward from the dividing surface 7. The connecting portions 8 are formed along the shaft insertion portions 3 and are arranged at equal intervals in the circumferential direction that is concentric with the rotation axis x. A claw portion 9 is formed at the tip of the connecting portion 8. The claw portion 9 protrudes from the outer surface of the connecting portion 8 toward the outside of the shaft insertion portion 3 that is a direction intersecting the rotation axis x. Furthermore, the connecting portion 8 is formed in a shape having a warp such that the distal end side is curved in a direction approaching the rotation axis x.

  A groove 10 extending along the rotation axis x is formed on the inner wall of the shaft insertion portion 3 of the second member 6. Four groove portions 10 are provided corresponding to each connecting portion 8 of the first member 5. In addition, a hooking portion 11 is formed at the upper end of the groove portion 10 to hook the claw portion 9 provided in each connecting portion 8 of the first member 5.

  The width dimension of the groove part 10 is a dimension in which the connecting part 8 fits without a gap. The length dimension of the groove portion 10 also corresponds to the length dimension of the connecting portion 8, and when the claw portion 9 of the connecting portion 8 is hooked on the hooking portion 11 of the groove portion 10, as shown in FIG. The first member 5 and the second member 6 are in close contact with each other at the dividing surface 7. Further, when the rotary shaft 2 is inserted into the shaft insertion portion 3, the outer peripheral surface of the rotary shaft 2 comes into contact with the connecting portion 8 and is in a presser other state. Is done. That is, the rotating shaft 2 in this embodiment functions as a contact member of the present invention.

  The first member 5 and the second member 6 are individually formed by injection molding using a synthetic resin as a material. As described above, each of the first member 5 and the second member 6 has a shape in which the blades 4a adjacent to each other and the blades 4b do not overlap each other in plan view. Thereby, the 1st member 5 and the 2nd member 6 can be shape | molded at low cost since the releasability from the metal mold | die used at the time of injection molding is good, and complication of a metal mold | die structure can be prevented.

  Next, a connection operation between the first member 5 and the second member 6 will be described. First, as shown in FIG. 4, the dividing surface 7 of the first member 5 and the dividing surface 7 of the second member 6 are opposed to each other. At this time, the first member 5 and the second member 6 are positioned together with the axis of the shaft insertion portion 3 (same as the rotation axis x).

  Next, as shown in FIG. 5A, the second member 6 is brought close to the first member 5, and the connecting portion 8 of the first member 5 is inserted along the shaft insertion portion 3 of the second member 6. At this time, the dividing surface 7 of the first member 5 and the dividing surface 7 of the second member 6 can be matched by aligning the groove 10 of the second member 6 with the position of the connecting portion 8 of the first member 5. . In addition, since the plurality of connecting portions 8 having the same shape and the corresponding groove portions 10 are provided at equal intervals, the connecting portions 8 and the groove portions 10 can be randomly aligned, and the operation is easy.

  Then, as shown in FIG. 5A, when the guide of the connecting portion 8 is started by the groove portion 10, the claw portion 9 comes into sliding contact with the groove portion 10, and the connecting portion 8 faces inward of the shaft insertion portion 3. Are pushed, and the connecting portion 8 is bent and deformed. However, since the connecting portion 8 is formed with a warp in the same direction as the bending direction at this time, the bending deformation at this time is extremely small, and stress hardly concentrates at the root end of the connecting portion 8. As a result, it is possible to reliably prevent the connecting portion 8 from being broken at the base end.

  Thereafter, when the divided surface 7 of the first member 5 and the divided surface 7 of the second member 6 are in close contact with each other, the claw portion 9 of the connecting portion 8 faces the hooking portion 11 as shown in FIG. At this time, the pressing of the claw portion 9 by the groove portion 10 is released, but the claw portion 9 is still separated from the latching portion 11 because the connecting portion 8 is warped.

  Subsequently, as shown in FIG. 5B, the rotation shaft 2 is inserted into the shaft insertion portion 3. At this time, with the insertion of the rotating shaft 2, the rotating shaft 2 presses the side surface opposite to the protruding side of the claw portion 9 of the connecting portion 8. Thereby, the curvature of the connection part 8 is corrected and it will be in the state which latched the nail | claw part 9 to the latching | locking part 11. FIG. Thus, the 1st member 5 and the 2nd member 6 are connected, and as shown in FIG. 1, the impeller 1 of the state by which the rotating shaft 2 was inserted by the shaft insertion part 3 is formed. Further, as shown in FIG. 2, the hooked state of the claw portion 9 with respect to the hooking portion 11 is reliably maintained by the contact of the rotating shaft 2 with the connecting portion 8.

  As described above, the impeller 1 formed by connecting the first member 5 and the second member 6 by the connecting portion 8 is extremely easy to manufacture as compared to the case where a multi-axis machine tool is used. Can be manufactured at cost. In addition, since the connecting portion 8 is formed in a shape having a warp in advance, a situation in which the connecting portion 8 is broken at the time of connecting the first member 5 and the second member 6 is reliably prevented. And since the rotating shaft 2 (contact member) contact | abuts to the connection part 8 and the latching state to the latching part 11 of the nail | claw part 9 is maintained firmly, the impeller 1 with high intensity | strength can be obtained.

  In the present embodiment, the configuration has been described in which the rotating shaft 2 that is inserted into the shaft insertion portion 3 functions as the contact member of the present invention. You may comprise so that it may insert in the shaft insertion part 3, and a rotating shaft may be inserted inside this contact member.

  In the present embodiment, the impeller 1 as a rotating body has been described. However, the present invention is not limited to this. For example, the present invention is applicable as long as it rotates around a rotation axis such as a sirocco fan or a turbo fan. The above effect can be obtained by applying.

  Moreover, in this embodiment, although the example which used the synthetic resin as the material of the impeller 1 was shown, it is not restricted to this, For example, metals, such as an aluminum alloy, can also be employ | adopted as a material.

  x ... rotation axis, 1 ... impeller (rotating body), 2 ... rotation shaft (contact member), 4 ... blade, 5 ... first member, 6 ... second member, 7 ... split surface, 8 ... connecting portion, 9 ... nail part, 11 ... hanging part.

Claims (3)

A rotating body comprising a plurality of blades extending radially about a rotation axis and rotating around the rotation axis,
Formed by connecting the first member and the second member of each shape divided in the rotation axis direction through a predetermined dividing surface,
A connecting portion provided continuously to the dividing surface of the first member and extending in the rotation axis direction;
A claw portion formed on one side surface of the connecting portion and projecting in a direction intersecting the rotation axis;
A latching portion formed on the second member and latched by the claw portion;
An abutting member that abuts the side surface of the coupling portion opposite to the protruding side of the claw portion to maintain the hooking state of the claw portion with respect to the latching portion;
The connecting portion is formed in advance in a shape having a warp in a direction in which the claw portion is separated from the latching portion, and the warpage of the connecting portion is corrected by the contact of the contact member with the connecting portion. The claw part is hooked on the hook part.   The rotating body according to claim 1, wherein a plurality of the connecting portions are arranged at equal intervals in a circumferential direction concentric with the rotation axis. A plurality of blades extending radially about the rotation axis are provided, and when viewed in plan with one of the rotation axis directions as an upper side, the blades adjacent to each other are formed so as to overlap each other , and around the rotation axis An impeller that rotates ,
Formed by connecting the first member and the second member of each shape divided in the rotation axis direction through a predetermined dividing surface,
A connecting portion provided continuously to the dividing surface of the first member and extending in the rotation axis direction;
A claw portion formed on one side surface of the connecting portion and projecting in a direction intersecting the rotation axis;
A latching portion formed on the second member and latched by the claw portion;
An abutting member that abuts the side surface of the coupling portion opposite to the protruding side of the claw portion to maintain the hooking state of the claw portion with respect to the latching portion;
The connecting portion is formed in advance in a shape having a warp in a direction in which the claw portion is separated from the latching portion, and the warpage of the connecting portion is corrected by the contact of the contact member with the connecting portion. The claw part is hooked on the hook part,
Each of the first member and the second member is arranged such that the blades adjacent to each other do not overlap each other when seen in a plan view, and connects the first member and the second member. The impeller is characterized in that the dividing surface is set so that at least a part of each blade of the second member overlaps above each blade of the first member.

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