JP3239846B2 - Centrifugal fan molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a centrifugal fan having a large number of radial blades.

[0002]

2. Description of the Related Art Conventionally, a method and apparatus for integrally forming a sirocco fan, which is a form of a centrifugal fan, have been disclosed in Japanese Patent Publication No. Sho 60-4.
No. 9406. This is because, in addition to providing a blade spacing forming protrusion on the outer peripheral surface of the fixed type boss at an interval, a similar protrusion is provided on the movable type, and the fixed type and the movable type are arranged in a different shape, and the protrusion is formed. A sirocco fan is formed by forming a blade forming gap between the pieces.

[0003]

However, such a molding method is provided by arranging a large number of thin-walled blades in the circumferential direction like a radial fan as previously proposed by the present applicant in Japanese Patent Application No. 6-111747. By narrowing the flow path to realize a flow very close to laminar flow, when applied to the molding of what improved the quietness, as described above, a large number of blades,
The manufacturing is difficult because the interval between the blades is narrow, the interval is gradually expanded from the inside to the outside, and the blades are thin.

That is, it is necessary to provide a mold provided with a large number of forming partition walls having a shape and a thickness corresponding to a narrow gap between the blade plates, and in this case, it is necessary to form the forming partition walls themselves.
Since processing is extremely difficult, the cost of the mold has been increased.

[0005] In addition, there is a possibility that the molded blade may be easily damaged when the mold is removed after molding.

Further, since the blade plate is thin, if it is rotated at a high speed to increase the air volume, the blade plate may be damaged or deformed, which may cause abnormal noise.

Further, in such a radial fan, the flow path needs to be relatively long in order to realize a flow close to a laminar flow. There is also a restriction that a so-called inner motor type in which the motor is housed inside the impeller to reduce the size of the fan unit cannot be adopted.

An object of the present invention is to provide a method for forming a centrifugal fan that can solve the above-mentioned problems.

[0009]

According to the present invention, an annular outer core, which is movable back and forth in the axial direction of the inner core, is overlapped on the end face of the inner core, and the center core is inserted into the center of the outer core. A large number of partition walls for molding with no vertical draft are disposed between the outer core and the center core at minute intervals, and then the resin is allowed to flow into the blade molding space between the partition walls and is cured. The present invention relates to a method for forming a centrifugal fan, which is a feature of the present invention.

Further, according to the present invention, the outer core and the center core are provided in a fixed mold, and the inner core and the molding partition wall are provided in a movable mold. Another feature is that the mold is separated from the fixed mold.

[0011] The present invention also provides a multi-blade sirocco fan, which is provided with a product projecting plate connected to the inner core below the center core and raised by raising the product projecting plate to form a resin with the inner core. The present invention relates to a method for forming a centrifugal fan, wherein the mold is removed from a blade plate forming space between walls.

Further, the present invention provides a method in which a stripper is provided below a center core so that a product protrudes from the center core, and the radial fan formed by resin molding is removed from a blade plate forming space between forming partition walls by raising the stripper. And a method for forming a centrifugal fan characterized by the following.

The present invention is also characterized in that a horizontal resin injection flow path is provided on the upper surface of the fixed mold, and a vertical resin injection hole communicating with a vertical gate of the center core is provided at the end of the flow path. .

Further, according to the present invention, a fixed type mounting plate in which a vertical resin injection flow path is inserted and a stripper are made to be capable of being polymerized and separated from each other in a fixed type, and the resin injected from the vertical resin injection flow path is horizontally resin injected. It is also characterized in that it is sequentially injected into the flow path, the vertical resin injection hole, the vertical gate of the center core, and the blade forming space.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, an annular outer core which is movable in the axial direction of the inner core is superposed on the end face of the inner core,
A large number of molding partition walls, which eliminate the vertical draft between the outer core and the center core by inserting the center core into the center portion of the outer core, are arranged at minute intervals, and then, between the molding partition walls. The resin is allowed to flow into the blade plate molding space to be cured, and the outer core and the center core are provided in a fixed mold, and the inner core and the molding partition wall are provided in a movable mold. When the mold is polymerized and the mold is removed, the movable mold is separated from the fixed mold.In addition, the product is projected below the center core, a stripper is arranged, and the radial fan molded by resin is raised by raising the stripper. The centrifugal fan is designed to be released from the molding space between the molding partition walls. Ensuring, moreover, is capable to perform a quiet operation.

The blade plate may be provided integrally on one side surface or both side surfaces of the mounting board, and may be formed in a fan shape that gradually expands from inside to outside in plan view. With this configuration, the blades can be formed in a relatively thick radial shape, and the strength of the blades can be increased to withstand high-speed rotation, so that a radial fan with a large air volume can be obtained.

Further, when at least a part of the mounting board is communicated with the outside, the movable mold among the molds for manufacturing the fan can be removed in the axial direction, thereby facilitating the manufacture.
In addition, the structure of the mold is simplified.

Further, at least a part of the end of the air outflow passage opposite to the mounting board is communicated with the outside,
The area of the air inflow opening is increased, and the air volume can be further increased.

Further, a product projecting plate connected to the inner core is disposed below the center core, and the product projecting plate is lifted to form a multi-blade sirocco fan resin-molded by the inner core to form a blade between molding partition walls. By removing the mold from the plate forming space, a multi-blade sirocco fan with a larger air volume and high quietness can be obtained.

In this case, when the center of gravity of the blade is positioned on a line connecting the inner end of the blade formed in an arc shape in plan view and the center of rotation of the blade, a reduction in strength is prevented as much as possible. Is what you do.

The mold for forming the centrifugal fan can have the following configuration.

That is, it has an annular inner core and an annular outer core that can move back and forth with respect to the inner core, and the lower portions of a large number of molding partition walls are arranged at minute intervals on the inner peripheral side of the inner core. The upper part of the forming partition wall is protruded from the opening end face of the inner core, and each forming partition wall is formed into a flexible thin plate having substantially the same thickness.

As a result, the processing of the molding partition wall is facilitated, the production of the molding die is also facilitated, and the overall cost can be reduced.

In order to make the molding die simpler, the outer core is moved forward and backward in the axial direction with respect to the inner core. For example, the molding dies are juxtaposed in a plurality of axial directions.
It is also possible to simultaneously mold a plurality of fans.

The outer core may be divided into a plurality of parts. In this case, if the plurality of divided outer cores move so as to gather as they approach the inner core. When the mold is closed, the thin molding partition wall is prevented from being damaged or deformed by interfering with the inner core, so that the mold can be closed securely.

Further, the large number of molding partition walls can be detachably attached to the inner core, and even if a part is deformed or damaged, only the corresponding one can be replaced, which is economical.

[0027] Further, the molding die is provided with a center core formed on the lower portion of the outer peripheral surface with a ridge corresponding to the molding partition wall provided on the inner core, and which can be inserted into the inner core. When such a center core is used, it is easy to form a reinforcing rib portion below the blade plate.

By the way, in order to form a fan whose blade plate has an arc shape in plan view, it is preferable to form the forming partition wall into a substantially arc shape in cross section. Moreover, in the present invention, since the cross-section plate thickness is uniformly formed in the upper and lower mold removal directions to eliminate the draft, the manufacture of the mold becomes easier and the cost can be reduced.

In this case, a support is provided in which a groove for holding the inner lower end portion of the forming partition wall provided on the inner core is formed on the upper outer peripheral surface and is arranged in contact with the lower surface of the inner core. It is good to have the composition provided.

When the inner core and the outer core are polymerized by the polymerization of the fixed mold and the movable mold configured as described above, the upper part of the molding partition wall projecting from the opening end face of the inner core is formed on the inner peripheral wall of the outer core. It is arranged radially along.

When a cylindrical center core is inserted into the center of the outer core, the inner peripheral edge of the molding partition wall protruding from the outer core is inserted into a groove formed on the outer peripheral surface of the center core. The mold is inserted and the partition wall for molding is interposed between the outer core and the center core, and the mold matching for centrifugal fan molding is completed.

When a centrifugal fan is formed by using the basic forming die configured as described above, as described above, the fixed mounting plate and the stripper are superposed on the upper surface of the fixed die, and the lower surface of the fixed die is mounted on the lower surface of the fixed die. After injecting the resin from the vertical resin injection channel after polymerization of the movable mold, the resin flows from the horizontal resin injection channel on the top of the fixed mold to the vertical resin injection hole, and from the injection channel to the vertical gate in the center of the center core. Flows into the blade plate forming space formed between the outer periphery of the center core and the inner periphery of the outer core through the space between the lower surface of the center core and the upper surface of the stripper that protrudes below the center core to cure the resin. . After curing, the fixed mold mounting plate and stripper are separated from the upper surface of the fixed mold, and then the movable mold is separated from the lower surface of the fixed mold, and the cured molding resin is held above the inner core of the movable mold via a molding partition wall. It has been done.

Next, the molded centrifugal fan is released from the molding partition wall by projecting the product projecting stripper.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

(First Embodiment of Centrifugal Fan) First, the structure of a first embodiment of a centrifugal fan formed by the method of forming a centrifugal fan according to the present invention will be described.

The centrifugal fan shown in FIGS. 1 to 5 is a radial fan B constituted by arranging a plurality of thin-walled blade plates 10 radially between two end plates formed of annular disks. There are many such blades 10 forming an annular wing.

Of the two end plates made of an annular disk, one end plate forms a mounting substrate 11 for mounting to a rotating motor (not shown). And a shaft mounting boss 13 made of a short cylindrical body is integrally formed on the inner surface of the central portion. The mounting substrate 11 has a peripheral rib portion 11a whose outer diameter is slightly larger than that of the wing body.

On the other hand, the other end plate 12 forms an air suction portion, has an outer diameter equal to that of the wing body, and has an air inflow opening 14 at the center thereof.

Next, the structure of the annular wing body will be described. As shown in FIG. 3, the wing body forms an air inflow space 15 communicating with the air inflow opening 14 inside the wing body. A narrow radial air outflow path 16 is formed between each of the 10 airflow paths, and further, the air outflow path 16 has an inner peripheral side opening communicating with the air inflow space 15 and an outer peripheral side opening radially extending. It communicates with the outside of fan B.

The width t of the radial air outflow path 16
Are formed so as to be substantially the same from the inner peripheral side to the outer peripheral side of the wing body.

For this purpose, the above-mentioned slats 10 are shown in FIGS.
As shown in (2), it is formed in a thin fan shape that gradually expands from the inside to the outside in a plan view (bottom view).

With this configuration, in the molding die A described later, the molding partition wall 44 for forming the blade plate 10 and the air outflow passage 16 can be a flat plate having a simple shape. In addition to eliminating the need for processing, even if processing is required, this is facilitated, so that the production of the molding die A is facilitated and cost reduction can be achieved.

Further, even if the air inlet opening 14 and the air inlet space 15 have a large diameter, the width t of the air outlet passage 16 is made substantially the same from the inner peripheral side to the outer peripheral side of the wing body, so that noise reduction and the like can be achieved. It has been experimentally confirmed that the performance degradation of the motor M can be suppressed as much as possible. From this fact, it becomes possible to arrange the motor M in the air inflow space 15, and it is possible to reduce the size by using an inner motor. (See FIG. 12).

Further, making the width t of the air outflow passage 16 substantially the same from the inner peripheral side to the outer peripheral side of the wing body also rectifies the airflow, and as described above, the air inflow opening 14 and the air inflow space Even if the length of the blade plate 10 in the radial direction is reduced in order to increase the diameter of the blade 15, the noise can be sufficiently reduced.

On the other hand, since the blade plate 10 is relatively thick, the strength is increased, and the strength of the entire radial fan B can be increased.

As shown in FIGS. 1 and 3, each of the rectangular blades 10 has the same width at one half of the end plate 12 side, while the other half of the mounting substrate 11 has the same width at the end plate. 12 to mounting board 11
Reinforcement rib 10 as tapered shape gradually widened toward
a.

Accordingly, the strength of the wing body is improved, so that the radial fan B can be driven to rotate at a high speed. At this time, the air inflow space 15 is depressurized and external air is passed through the air inflow opening 14 through the air inflow space. 15 and then flow into the radial air outflow passages 16 formed between the blades 10 through the same air inflow space 15 from all the inner circumferential openings, and then all the outer circumferential sides of the air outflow passages 16 A large amount of air can flow out from the opening.

As shown in FIGS. 2 to 5, the radial fan B according to this embodiment has a large number of radial air outflow passages 16 provided on the mounting board 11 and in the wing body.
A large number of rectangular slit-shaped windows 17 radially extending toward the outer periphery of the wing body are provided at locations corresponding to the air outlet path 16 as in the air outflow passage 16. Each window 17 communicates with each air outflow passage 16 in an aligned state.

The presence of the window portion 17, as will be described later, makes it possible to integrally form the movable mold A by moving the movable mold in the axial direction of the radial fan B, thereby simplifying the apparatus configuration of the mold A. The radial fan B which can be manufactured at low cost and has high molding accuracy can be easily injection-molded.

Incidentally, in the radial fan B described above, although not shown, the following modified examples are conceivable.

The end plate 12 is removed from the radial fan B,
It is composed of a wing body composed of a mounting board 11 and a large number of blades 10.

The peripheral rib 11a is eliminated from the mounting board 11 of the radial fan B, and the mounting board 11 and the end plate 12 have the same outer diameter.

The mounting board 11 for the radial fan B is provided at the center in the axial direction of the wing body while leaving the peripheral rib portion 11a as it is.

The mounting board 11 for the radial fan B is provided at the axial center of the wing body while leaving the peripheral rib 11a as it is, and the end plate 12 is eliminated.

The mounting board 11 for the radial fan B is provided at the center of the blade body in the axial direction, and the peripheral rib 11a is eliminated.

Next, another embodiment of the radial fan B will be described with reference to FIGS.

(Second Embodiment of Centrifugal Fan) In the centrifugal fan shown in FIG. 6, a large number of blades 10 are integrated on both sides of a mounting board 11 of a radial fan B at a small interval in the circumferential direction. They are arranged radially.

That is, the mounting board 11 is provided at the center of the wing body, the end plates 12, 12 are provided at both ends in the axial direction of the wing body, the peripheral ribs 12a are provided on the both end plates 12, 12, and Rectangular slit-shaped windows 18, 18, which flow in alignment with the air outflow passage 16.

In this case, although not shown, a rectangular slit-shaped window communicating with the air outflow passage 16 can also be provided on the mounting board 11.

(Third Embodiment of Centrifugal Fan)
The end of the air outflow passage 16 opposite to the mounting board 11 has a structure in which at least a part thereof communicates with the outside.

FIGS. 7 to 9 show the basic configuration of the radial fan B according to the first embodiment, in which not only the mounting board 11 but also the end plate 12 are aligned with the air outflow passage 16. A rectangular slit-shaped window portion 19 communicating with the mounting portion 11 is provided, and the window portion 19 has a smaller area than the window portion 17 provided on the mounting board 11. Therefore, air can be taken in also from the window 19, and the area of the air inflow opening is substantially increased, so that the air volume can be increased.

Incidentally, in the radial fan B,
Although not shown, the following modifications are possible.

The peripheral rib 11a is eliminated from the mounting substrate 11 of the radial fan B, and the mounting substrate 11 and the end plate 12 have the same outer diameter.

The mounting board 11 for the radial fan B is provided at the center in the axial direction of the wing body while leaving the peripheral rib portion 11a as it is.

The mounting board 11 for the radial fan B is provided at the center of the blade body in the axial direction, and the peripheral rib 11a is eliminated.

The end plate 12 of the radial fan B is formed from a narrow annular plate integrally connected only to the outer peripheral edge of the blade body.

The end plate 12 of the radial fan B is formed from a narrow annular plate integrally connected only to the intermediate peripheral portion of the wing.

The end plate 12 of the radial fan B is formed from a narrow annular plate integrally connected only to the inner peripheral edge of the wing.

The end plate 12 of the radial fan B is connected from a narrow annular plate integrally connected only to the intermediate peripheral portion of the wing body, and the annular plate is projected from the end surface of the wing body.

The radial fan B shown in FIG. 10 and FIG. 11 penetrates through the intermediate peripheral edge of each blade plate 10 constituting the wing body in the circumferential direction and communicates radial air outflow passages 16 with each other. A hole 21 is provided, and the upper end of the through hole 21 is
It communicates with a window portion 22 provided in a radial rectangular slit shape on 12.

(Fourth Embodiment of Centrifugal Fan) The radial fan B shown in FIG. 12 has a motor M disposed in the air inflow space 15 to reduce the size of the radial fan B. Here, the motor M is provided on the wing structure described in the first embodiment. However, if the mounting substrate 11 is formed at the axial end of the wing, the second The third embodiment is also applicable.

(Fifth Embodiment of Centrifugal Fan) Next, as one mode of the centrifugal fan according to the present invention, a silent type multi-blade sirocco fan B 'which is an improved version of a conventional sirocco fan will be described with reference to FIGS. It will be described with reference to FIG.

The multi-blade sirocco fan B 'is
Are provided integrally on one side surface or both side surfaces of the mounting substrate 11, and the blade plate 10 is formed in an arc shape in plan view.

That is, as compared with the conventional sirocco fan,
The number of the blades 10 is 100 as in the case of the radial fan B described above.
The number is as many as about one, and as shown in FIGS. 14 and 15, the blade plate 10 has an arc shape in plan view.

In this embodiment, the height H of the wing body is increased as compared with the previous embodiments 1 to 4, so that the volume of the air inflow space 15 is increased and the amount of air taken in is increased to increase the air volume. Are increasing.

Further, since the mounting substrate 11 is curved gently inward and the inner surface is formed in a convex shape, the strength is increased, and the inner surface of the mounting substrate 11 is gently curved. The convex shape allows the air to flow smoothly to the base end side of the slats 10, thereby making the air flow uniform and increasing the total air volume.

Further, also in the present embodiment, as shown in FIG. 15, the width t of the air outflow passage 16 is made substantially the same from the inner peripheral side to the outer peripheral side of the wing body, so that silence can be ensured. It has realized a centrifugal fan with excellent air volume, pressure and quietness.

Further, as shown in FIG. 16, an inner end portion 10b of the blade plate 10 which forms a connecting portion between the blade plate 10 and the mounting board 11 formed in an arc shape in a plan view, and a rotation center P of the blade body. The center of gravity G of the slat 10 is located on the line connecting

That is, the multi-blade sirocco fan B 'is different from the radial fan B described in the first to fourth embodiments in that the blade plate
Since the thickness of No. 10 is thin, the strength during rotation tends to be weak.

Further, at the time of rotation, the center of gravity of the blade plate 10 is located between the rotation center P of the multi-blade sirocco fan B 'and the inner end of the blade plate 10.
10b, so that the center of gravity G
The greater the deviation between the position and the line connecting the rotation center P and the inner end 10b of the blade plate 10, the greater the stress applied to the inner end 10b of the blade plate 10. Therefore, as described above, the center of gravity G of the blade plate 10 is positioned on the line connecting the inner end portion 10b of the blade plate 10 and the rotation center P of the blade body, thereby preventing the strength from decreasing as much as possible.

With the above configuration, the multi-blade sirocco fan B 'according to the present embodiment can have a relatively larger inner / outer diameter ratio than the conventional centrifugal fan. Is possible.

Further, even when the motor M is provided on the mounting substrate 11 side, since the outer surface of the mounting substrate 11 is concave, the length in the axial direction can be absorbed and the size can be reduced. it can.

In this embodiment, the blade 10 is attached to the mounting board.
Although the one provided integrally on only one side surface of the mounting substrate 11 is shown, the blade plate 10 may be provided integrally on both side surfaces of the mounting substrate 11.

Next, the first to fourth centrifugal fans described above are used.
A mold A capable of integrally molding the radial fan B according to the fourth embodiment will be described below with reference to FIGS.

First, the overall structure of the mold A is shown in FIG.
This will be described with reference to FIG. 17 and FIG.
In the above, the mold A is usually installed in a vertical state, but is arranged in a horizontal state to facilitate the description of the structure.

In FIG. 17, reference numeral 30 denotes a movable mounting plate movable by a moving device (not shown). Above the movable mounting plate 30, a movable die 31, a fixed die 32, and a stripper 33 are sequentially arranged. And the fixed mounting plate 34 are disposed in a superposed state or a juxtaposed state.

As shown in FIG. 17, the movable die 31 is provided with a stripper fitting concave portion 35 on its fixed upper surface, and a product protruding stripper 36 which can move forward and backward toward the fixed die 32 in the concave portion 35. .

The specific configuration of the product protrusion stripper 36 is shown in FIGS. 21 and 26. The stripper 36 is formed in a columnar shape having a center pin insertion hole 37 at the center, and a concentric mounting bolt hole 38 is provided around the center pin insertion hole 37.

As shown in FIGS. 17 and 19, the movable mold 31 is provided with an annular step 40 for attaching an inner core around the upper edge of the above-mentioned stripper fitting recess 35. The lower portion of the inner core 41 is fixedly connected to the inner core 41 by fastening bolts 42.

The specific configuration of the inner core 41 is shown in FIGS. 21 and 25. The inner core 41 is attached to and detached from the lower large-diameter base 43 formed of a thick annular plate and the lower large-diameter base 43. It is composed of a number of radial forming partition walls 44 freely arranged (see FIG. 21). The molding partition 44 is a radial fan B
The radial air outflow path 16 is formed.

The lower large-diameter base portion 43 has an outer diameter equal to the inner diameter of the annular step portion 40, and is provided with fastening bolt insertion holes 45 at regular intervals in the circumferential direction.

The radial forming partition wall 44 is made of a flat plate made of a steel plate having substantially the same thickness, and has a lower large-diameter base 43.
It is removably attached to the inside at a constant radial interval.

That is, it is mounted in a state inserted into the partition wall insertion groove 41a formed on the upper part of the lower large diameter base 43, and the lower end of the molding partition wall 44 is flush with the lower surface of the lower large diameter base 43. In this state, the upper part is protruded from the upper surface of the lower large-diameter base 43 toward the fixed mold 32.

A large number of blade forming spaces 46 for forming a large number of blades 10 constituting the blades of the radial fan B are formed between adjacent forming partition walls 44. (See FIGS. 19 and 20).

In FIG. 21, reference numeral 44a denotes a projecting piece projecting from the upper end of the forming partition wall 44. By providing the projecting piece 44a, a radial air outflow passage 16 is formed on the end plate 12 of the radial fan B. A rectangular slit-shaped window portion 19 communicating with the third slit can be formed (third embodiment: see FIG. 8). Also,
The envelope surface formed by the inner peripheral ends of the plurality of forming partition walls 44 forms a through hole 47 through which the above-mentioned product projecting stripper 36 is inserted so as to be able to advance and retreat.

As described above, since the forming partition wall 44 for forming the radial air outflow passage 16 of the radial fan B is formed of a thin flat plate having substantially the same plate thickness, the forming partition wall is formed. Processing is facilitated and the production of the mold A is also simplified, so that the equipment cost can be reduced and the cost of the product can be reduced.

Further, since the forming partition wall 44 is detachably attached, it can be easily replaced when it is deformed or damaged. That is, for example, if all of the forming partition walls 44 are integrally formed, even if the partition walls are partially deformed or damaged, all the partition walls must be replaced, which is uneconomical.

As shown in FIGS. 17 and 19, an outer core mounting recess 48 is provided on the lower surface of the fixed mold 32 at a position corresponding to the inner core 41 described above.

Then, in the outer core mounting concave portion 48,
An outer core 49 made of a thick annular plate is fitted, and the outer core 49 is further connected and fixed to the fixed mold 32 by a fastening bolt 50.

The specific structure of the outer core 49 is shown in FIGS. 21 and 24. The outer core 49 is formed of a thick annular plate as described above, and a large number of forming partition walls are radially attached to the center of the outer core 49 so as to project upward from the inner core 41.
A partition wall insertion space 51 into which the 44 is inserted is formed.

The outer core 49 advances and retreats in the axial direction relative to the inner core 41 to thereby form the partition wall insertion space.
The partition wall for molding 44 is inserted into the inside of the partition wall 51. The diameter of the partition wall insertion space 51 is substantially equal to the diameter of an envelope formed at the outer peripheral end of the partition wall for molding 44.

Further, at the lower end of the partition wall fitting space 51 of the outer core 49, as shown in FIG. 24, there is provided an annular step 52 having a diameter slightly larger than that of the fitting space 51. As shown in FIG. 19, the annular step 52 cooperates with the inner core 41 to form a peripheral rib forming space 53 for forming the peripheral rib 11a of the mounting board 11 of the radial fan B described above. It is for doing.

As one form of the outer core 49, for example, the outer core 49 is constituted by four arc-shaped divided cores.
It may be divided into a plurality of parts. In this case, it is desirable that the outer core 49 divided into a plurality of parts is configured to be movable so that the arc-shaped divided cores gather as the inner core 41 approaches. With this configuration, there is no possibility that the thin molding partition wall 44 will be damaged or deformed by interfering with the outer core 49, and the outer end of the blade plate forming space 46 of the inner core 41 is securely closed (the mold). Can be closed).

A center core 54 is arranged at the center of the outer core mounting recess 48 provided on the lower surface of the fixed mold 32 so as to form a concentric circle with the outer core 49, as shown in FIGS. Has been established. The center core 54 is fixedly connected to the fixed mold 32 by a fastening bolt 55.

The specific structure of the center core 54 is shown in FIGS.
This is shown in FIG. The center core 54 is provided with a large number of grooves 54a on its outer peripheral surface for holding the forming partition wall 44 at intervals in the circumferential direction, and the inner peripheral end of the forming partition wall 44 is fitted into the groove 54a. ing. Also, at the lower end of the groove 54a, a ridge 56 corresponding to the molding partition wall 44 is formed, and each ridge 56 is formed.
A tapered groove 57 for forming the reinforcing rib portion 10a of the blade plate 10 constituting the wing body is formed therebetween.

Then, as shown in FIG.
The outer end of 56 and the inner end of the forming partition wall 44 are arranged in a state where they abut each other.

Accordingly, when the radial fan B is formed, as shown in FIG.
Can be formed.

Further, as shown in FIGS. 22 and 23,
The center core 54 has a center pin (described later)
A pin insertion recess 60 for fitting the 80 is provided, and a ring gate 61 is provided at the center of the bottom surface of the pin insertion recess 60. The diameter of the ring gate 61 is the center pin 80
The diameter is smaller than the diameter.

In the center of the center core 54, a vertically long vertical gate 62 whose diameter is gradually reduced toward the ring gate 61 is provided. One end of the vertical gate 62 is open on the upper surface, and the other end communicates with the ring gate 61.

Therefore, as shown in FIGS. 17 and 19, the center pin 80 is
When it is inserted into the
A shaft mounting part forming space 63 can be formed between the inner peripheral surface of the shaft 60 and the coaxial mounting part forming space 63.
Can be communicated with.

The upper outer peripheral portion of the center core 54 is
As shown in FIG. 5, an annular step 64 is formed.
As shown in FIG. 17 and FIG.
Attach 65.

As shown in FIGS. 17 and 19, in this embodiment, an end plate is provided between the outer core mounting recess 48 and the forming partition wall 44 around the convex piece 44a of the partition wall 44. Molding space
66 are formed.

Next, the resin inflow path through which the molding resin flows into the blade plate forming space 46, the peripheral rib portion forming space 53, and the end plate forming space 66 will be described. A rocket ring 70 is provided in the center of the fixed mounting plate 34, and a spool 71 is concentrically disposed inside the ring 70 so as to penetrate the fixed mounting plate 34 and the stripper 33. A vertical resin injection channel 72 is provided at the center of 71.

On the upper surface of the fixed mold 32, there is provided a horizontal resin injection passage having the lower end opening of the vertical resin injection passage 72 and the start end thereof in communication.
73 are provided.

On the other hand, the end of the horizontal resin injection channel 73 is
As shown in FIG. 9, it communicates with a vertical gate 62 provided in the center core 54 via a vertical resin injection hole 74 provided in the fixed mold 32.

Therefore, the molding resin that has been pressure-fed into the resin injection flow paths 72 and 73 through a pressure-fed flow path (not shown) is:
Through the vertical resin inlet hole 74 → the ring gate 61, firstly, it flows into the blade plate forming space 46 from the shaft mounting portion forming space 63, and then flows into the peripheral rib portion forming space 53 and the end plate forming space 66. Then, by curing and curing for a predetermined time,
The radial fan B can be formed.

Next, the removal of the molded product will be described. As shown in FIGS. 17 and 19, a product projecting pin 75 having a base end connected to a product projecting plate 76 is connected to a product projecting stripper 36. When the product protruding plate 76 is protruded upward, the product protruding pin 75 and the product protruding stripper 36 formed integrally with the pin 75 are integrally protruded to extrude the formed radial fan B to the outside, and take out the radial fan B. it can.

Next, the detachment of the runner R will be described. As shown in FIGS. 17 and 19, the runner lock pin 77 is incorporated in the fixed type mounting plate 34 and the stripper 33. Although it is in a locked state at the lower end of 77, the lock of the runner R is forcibly released by moving the stripper 33 relative to the fixed mounting plate 34, and the runner R is released as shown in FIG. Can be.

Further, other configurations of the above-described molding die A will be described with reference to FIGS. 17 and 19.

In the figure, reference numeral 80 denotes the above-mentioned center pin.
The base end is connected and fixed to the movable mounting plate 30 with fastening bolts 81, and the end protrudes from the product and passes through the center pin insertion hole 37 provided in the center of the stripper 36, and then the center core
54 extend into the pin insertion recess 60. Therefore, the shaft mounting portion forming space 63 is formed between the outer peripheral surface of the center pin 80 and the inner peripheral surface of the pin insertion recess 60, and the ring gate 61 is formed on the distal end surface of the center pin 80. Can be. In addition, the shaft mounting part forming space 63 and the ring gate 61
Is in communication with

Here, referring to FIGS. 27 to 31,
A method for forming a centrifugal fan, that is, a process for manufacturing a radial fan B using the above-described mold A will be described. Note that, in order to facilitate understanding of the manufacturing process, in these drawings, only the components related to each process are shown by hatching.

(Step 1) This step relates to injection molding of a molded product (radial fan B). As shown in FIG. 27, a movable mold 31, a fixed mold 32, a stripper
33 and the fixed mounting plate 34 are assembled together, and the center core
54, the outer core 49, the inner core 41, the product projecting stripper 36, and the center pin 80 form a wing plate forming space.
46, a peripheral rib forming space 53, a space 36 for forming an end plate,
A shaft mounting portion forming space 63 is formed.

Next, as described above, the molding resin is pressure-fed into the resin injection flow paths 72 and 73 through a pressure-fed flow path (not shown). The molding resin is a vertical resin injection hole 74 → ring gate
After passing through 61, firstly, it flows into the blade plate forming space 46 from the shaft mounting portion forming space 63, and then flows into the peripheral rib part forming space 53 and the end plate forming space 66. After curing for a predetermined time, the radial fan B is formed.

(Step 2) In this step, regarding the gate cutting, after the molding resin is cured, as shown in FIG. 28, the movable device is driven to move the movable mold mounting plate 30 (downward in the figure). ,
In conjunction with the separation movement, the fixed mold 32 and the movable mold 31 are separated from the stripper 33 and the fixed mounting plate 34. By this separating operation, the runner R is cut and separated from the radial fan B.

At this time, as shown in FIG. 19, the radial fan B is connected to the runner R only through the lower end of the narrow vertical resin injection hole 74. Can be easily separated from the radial fan B. In addition, the separated cut surface has a beautiful finish without burrs and the like, although a slight cut streak remains.

(Step 3) This step relates to the removal of the radial fan B from the fixed mold 32, by driving the movable device as shown in FIG. From the fixed mold 32. With this separation, the radial fan B is also released from the fixed die 32.

The runner R is separated from the runner lock pin 77 by moving the stripper 33 from the fixed mounting plate 34.

(Step 4) This step relates to the protrusion of the radial fan B, as shown in FIG.
To push out the radial fan B to the outside.

(Step 5) This step relates to the clamping of the molding die A. The molding die A in the state of FIG. 30 is clamped again to return to the state of FIG. B enables the forming operation. In this way, by repeating the above-described steps 1 to 4, the radial fan B can be mass-produced by integral molding, and the cost can be reduced.

In particular, since the outer core 49 advances and retreats in the axial direction with respect to the inner core 41, the structure of the mold is simplified as compared with, for example, a structure in which the outer core advances and retreats radially. , The outer core 49, the inner core 41, the product protruding stripper 36, and the center core 54 can be arranged in a plurality of axial directions, respectively. In this case, a plurality of moldings can be performed at one time, and the manufacturing cost can be reduced. It can be further reduced.

Further, since the formed radial fan B is an integrally formed product, it has high strength and can prevent breakage during use as much as possible.

The radial fan B can be used not only for a hot air fan and a deodorizing fan, but also for a heat exchanger fan and all other uses.

Next, a molding die A 'for molding a multi-blade sirocco fan B' according to the fifth embodiment of the centrifugal fan will be described with reference to FIGS. Note that the same reference numerals are used for the same constituent members.

The overall configuration of the molding die A 'is as shown in FIG. 31. Basically, the outer core 49 and the center core 54 are fixed to the fixed die 32 in the same manner as in the molding die A described above. (Not shown) to form a partition wall 44 for forming the blade 10 of the multi-blade sirocco fan B 'on the movable mold 31.
The inner core 41 to which the
Are configured to advance and retreat in the axial direction with respect to the inner core 41. In the present embodiment, the movable core 31 is attached to the inner core 41.
Is formed, and a lower mold C is formed in the recess.
Is installed.

In the lower die C, as shown in FIG. 31, a partition wall base support 86 is fitted to an annular pedestal 85, and a center pin insertion cylinder 87 is fitted to the support 86. The inner core 41 to which a number of forming partition walls 44 are attached is fitted around the upper half of the cylindrical body 87.

The inner core 41 has a cylindrical insertion hole 93 formed at the center of the mounting substrate forming projection 41b which is gently curved toward the center core 54 (FIG. 32). It should be noted that the center core 54 is formed with a concave portion corresponding to the mounting substrate forming convex portion 41b.

The center pin insertion cylinder 87 fitted in the cylinder insertion hole 93, the pin insertion recess 60 formed in the center of the recess of the center core 54, and the center pin 80 inserted in the pin insertion recess 60. Space for molding the shaft mounting part with the tip of
63 are formed.

As shown in FIG. 32, a large number of arcuate partition wall insertion grooves 41a are formed in an annular shape on the peripheral edge of the mounting substrate forming projection 41b. A molding partition wall 44 shown in FIG. 33 is inserted through each of 41a.

As shown in FIG. 33 (b), the forming partition wall 44 according to the present embodiment is naturally formed in a thin circular arc shape in a sectional view. t '
Are formed uniformly in the upper and lower mold removal directions, and the outer core 49
The diameter of the inner peripheral surface 51a of the partition wall insertion space 51a is all uniform, and the draft A 'is eliminated in the main mold A'. Therefore, the structure of the molding die A 'is simplified, and the die cost can be reduced.

As shown in FIG. 31, the lower end of the molding partition wall 44 inserted into the partition wall insertion groove 41a of the inner core 41 is formed as shown in FIG.
It is held between the pedestal 85 and the partition wall base support 86, and the inner edge of the molding partition wall 44 is formed in a support recess 86a formed on the outer peripheral edge of the partition wall base support 86 shown in FIG. It is inserted and supported, and the outer edge has a U-shaped cutout 44b
Retaining flange 85a formed on the upper inner peripheral edge of 85
(See FIG. 35) so as not to come off in the removal direction. Also, as shown in FIG.
85 is divided into two parts so that the notch 44b of the partition wall 44 and the flange portion 85a for retaining are engaged after the partition wall 44 for molding is attached to the inner core 41.

In FIG. 31, reference numeral 91 denotes an end surface forming ring attached to the upper outer peripheral surface of the center core 54.
A concave portion having a thickness enough to form the end surface 12 of the multi-blade sirocco fan B 'is provided on the lower surface of the multi-blade sirocco fan B' to form an end plate forming space 66. Reference numeral 92 denotes a mounting substrate molding space, which is formed between the mounting substrate molding projection 41b and the center core 54. Note that the other configuration is the same as that of the molding die A described above, and a description thereof will be omitted.

Here, the resin inflow path will be described.
In the present embodiment, the vertical gate 62 is connected to the end face forming ring 91.
The molding resin that has been pressure-fed into the resin injection flow paths 72 and 73 through a pressure-feeding flow path (not shown) passes through the vertical resin inflow hole 74 → the vertical gate 62 → the point gate 61 ′, and is used for forming an end plate. The space 66 flows into the blade plate forming space 46, and then flows into the mounting substrate forming space 92, the shaft mounting portion forming space 63, and the peripheral rib portion forming space 53.

Further, a molded multi-blade sirocco fan
Explaining the removal of B ′, the mold A ′ is a movable mold 3 having the base end connected to the product protrusion plate 76, the tip of a product protrusion pin 75 connected to the inner core 41, and the inner core 41 provided.
1. In a state where the fixed mold 32 provided with the outer core 49, the stripper 33, and the fixed mold mounting plate 34 are separated from each other (the forming step 3 of the radial fan B: see FIG. 29),
The multi-blade sirocco fan is made by projecting the product projecting plate 76 upward and projecting the inner core 41 connected to the product projecting pin 75.
B 'is pushed out of the mold and taken out.

As described above, in the molding die A ′ having the above structure, the outer core 49 advances and retreats in the axial direction with respect to the inner core 41 similarly to the molding die A described above. The multi-blade described in the fifth embodiment is simpler in structure than the one that moves radially, and the outer core 49 and the lower mold C can be arranged side by side in a plurality of axial directions. The sirocco fan B 'can be easily mass-produced by integral molding, and the cost can be reduced.

[0145]

As described above, the present invention has the following effects.

According to the first aspect of the present invention, an annular outer core that can move back and forth in the axial direction of the inner core is overlapped on the end face of the inner core, and the center core is inserted into the center portion of the outer core to insert the outer core. Between the core and the center core, a large number of partition walls for molding with no vertical draft are disposed at minute intervals, and then the resin is caused to flow into the blade molding space between the molding partition walls and to be cured. So, each molding partition wall,
Since it can be formed of a thin flat plate, and the processing of the forming partition wall is easy, the manufacture of the forming die becomes easy and the overall cost can be reduced.

Furthermore, since the center core is inserted into the center of the outer core, the inner diameter of the wing can be increased, and this has the effect that an inner motor can be used.

Further, since the outer core advances and retreats in the axial direction with respect to the inner core, the structure of the mold is simplified, and the molding portions of the mold may be arranged in a plurality of axial directions. In this case, a plurality of moldings can be performed at one time, and the manufacturing cost can be further reduced.
In addition, a product protruding plate is arranged below the center core, which is raised to remove the multi-blade sirocco fan formed by the inner core from the blade plate forming space, so that large air volume and quietness are high. There is an effect that a multi-blade sirocco fan can be obtained.

In addition, the product projecting stripper has an effect that the molded product can be easily and reliably removed from the mold.

[0150]

[0151]

As described above, it is possible to provide a low-cost centrifugal fan having a large air volume and a small size while having a compact shape.

[Brief description of the drawings]

FIG. 1 is a partially cutaway overall perspective view of a first embodiment of a centrifugal fan formed by a forming method according to the present invention.

FIG. 2 is an overall perspective view when the centrifugal fan is inverted.

FIG. 3 is a vertical sectional view of the centrifugal fan.

FIG. 4 is a bottom view taken along the line II in FIG. 3;

FIG. 5 is a plan view taken along the line II-II in FIG. 3;

FIG. 6 is a vertical sectional view of a centrifugal fan according to a second embodiment of the centrifugal fan.

FIG. 7 is a longitudinal sectional view of a centrifugal fan according to a third embodiment of the centrifugal fan.

FIG. 8 is a partially cutaway overall perspective view of the centrifugal fan according to the third embodiment of the centrifugal fan.

FIG. 9 is a bottom view taken along line III-III in FIG. 7;

FIG. 10 is a longitudinal sectional view showing a modified example of the centrifugal fan according to the third embodiment of the centrifugal fan.

FIG. 11 is a plan view taken along the line IV-IV in FIG. 10;

FIG. 12 is a vertical sectional view of a centrifugal fan according to a fourth embodiment of the centrifugal fan.

FIG. 13 is a longitudinal sectional view of a centrifugal fan according to a fifth embodiment of the present invention.

FIG. 14 is a plan view of a centrifugal fan according to a fifth embodiment of the centrifugal fan.

FIG. 15 is an enlarged view of a blade plate of the centrifugal fan according to the fifth embodiment of the centrifugal fan.

FIG. 16 is an explanatory diagram of a blade plate of the centrifugal fan.

FIG. 17 is a longitudinal sectional view of a molding die used in the molding method according to the present invention.

18 is a sectional view taken along line VV in FIG.

FIG. 19 is an enlarged vertical sectional view of a main part of a molding die.

20 is a sectional view taken along line VI-VI in FIG.

FIG. 21 is an enlarged exploded perspective view of a main part of a molding die.

FIG. 22 is a longitudinal sectional view of a center core.

FIG. 23 is a view taken along the line V11-VII in FIG. 22;

FIG. 24 is a longitudinal sectional view of the outer core.

FIG. 25 is a longitudinal sectional view of the inner core.

FIG. 26 is a vertical cross-sectional view of a product protrusion stripper.

FIG. 27 is an explanatory diagram of a forming process of the radial fan.

FIG. 28 is an explanatory diagram of the same step.

FIG. 29 is an explanatory diagram of the same step.

FIG. 30 is an explanatory diagram of the same step.

FIG. 31 is a longitudinal sectional view showing another embodiment of a molding die used in the molding method according to the present invention.

FIG. 32 is a plan view of an inner core of the mold.

FIG. 33 is an explanatory diagram of a molding partition wall of the molding die.

FIG. 34 is a plan view of a partition wall base support of the molding die.

FIG. 35 is a plan view of a base of the molding die.

[Explanation of symbols]

 A Mold A 'Mold B Radial fan B' Multi-blade sirocco fan t Width 10 Blade plate 11 Mounting board 12 End plate 15 Air inlet opening 16 Air outlet channel 17 Window 41 Inner core 44 Molding partition wall 46 Blade plate molding Space 49 outer core

Continuation of the front page (56) References JP-A-9-151898 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 29/28

Claims (6)

(57) [Claims] An annular outer core (49), which is movable back and forth in the axial direction of the inner core (41), is superimposed on the end surface of the inner core (41), and a center core (54) is formed at the center of the outer core (49). ) Is inserted between the outer core (49) and the center core (54) to form a large number of forming partition walls (44) having no vertical draft, and then forming partition walls. (44) wing plate forming space between
(46) A method for molding a centrifugal fan, wherein a resin is caused to flow into and cured. 2. An outer core (49) and a center core (54) are provided on a fixed mold (32), and an inner core (41) and a forming partition wall (44).
Is provided on the movable mold (31), and at the time of molding, each mold (32), (31)
When the mold is polymerized and the mold is removed, the movable mold (31) is fixed (32)
2. The method for forming a centrifugal fan according to claim 1, wherein the centrifugal fan is separated from the fan. 3. An inner core (41) below the center core (54).
The product projecting plate (76) communicated with is provided, the product projecting plate (76) is raised, and the multi-blade sirocco fan (B ') resin-molded by the inner core (41) is used as a molding partition wall (44). 2. The method for molding a centrifugal fan according to claim 1, wherein the mold is removed from the blade plate forming space (48). 4. A product projecting stripper (36) is provided below the center core (54), and the resin-molded radial fan (B) is raised by raising the stripper (36) to form a molding partition wall (44). 3. The method for forming a centrifugal fan according to claim 1, wherein the mold is removed from the blade plate forming space (46) therebetween. 5. A horizontal resin injection channel (7) is provided on the upper surface of the fixed mold (32).
3), wherein a vertical resin injection hole (74) communicating with the vertical gate (62) of the center core (54) is provided at the end of the channel (73). The method for molding the centrifugal fan according to the above. 6. A fixed type mounting plate (34) into which a vertical resin injection channel (72) is inserted and a stripper (33) are superimposed on and separated from the fixed type (32). The resin injected from (72) is fed into a horizontal resin injection channel (73), a vertical resin injection hole (74), and a center core (54).
The method for forming a centrifugal fan according to any one of claims 1 to 5, wherein the liquid is sequentially injected into the vertical gate (62) and the blade plate forming space (46).