JPH09151898A - Centrifugal fan and mold therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide centrifugal fan to have a high gas quantity and be quiet though the fan is formed in a compact manner, and be manufactured at a low cost. SOLUTION: A mold comprises an inner core 41; and an outer core 49 movable forward to and backward from the inner core 41. A number of partition walls 44 for molding are radially disposed on the inner circumferential side of the inner core 41 with a fine distance therebetween and besides, the molding partition wall 44 is formed approximately in a uniform thickness and in a thin sheet-form shape or an arcuate shape in cross section. Further, the outer core 49 is axially moved forward to and backward from the inner core 41 and a number of the partition walls 44 for molding are removably mounted on the inner core 41. A centrifugal fan is integrally injection-molded by a so formed mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal fan having a large number of radial blades and a molding die therefor.

[0002]

2. Description of the Related Art Conventionally, a method and apparatus for integrally forming a sirocco fan, which constitutes a form of a centrifugal fan, are disclosed in
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 forming method and forming apparatus are provided with a thin blade in the circumferential direction like a radial fan as previously proposed by the present applicant in Japanese Patent Application No. 6-111747. When a large number of vanes are provided and the flow path is narrowed to realize a flow that is very close to a laminar flow and noise reduction is enhanced, as described above, there are many vanes and the spacing between the vanes is large. Was difficult to manufacture because the blades were narrow, the intervals were gradually widening from the inside to the outside, and the blades were 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 vane plate is thin, there is a possibility that abnormal noise may occur when the vane plate is damaged and deformed when it is rotated at a high speed to increase the air volume.

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.

It is an object of the present invention to provide a centrifugal fan and a mold for the same which can solve the above problems.

[0009]

DISCLOSURE OF THE INVENTION According to the present invention, a disc-shaped mounting substrate connected to a power source and a large number of plate-shaped blades integrally provided on the substrate and arranged at minute intervals in the circumferential direction. A plate and a narrow-width air outflow passage that is formed between each vane plate and communicates with an air inflow opening formed in the central portion of the blade body formed by each vane plate, The present invention relates to a centrifugal fan, characterized in that the width is formed to be substantially the same from the inner peripheral side to the outer peripheral side of the blade body.

Further, according to the present invention, the blade plate is integrally provided on one side surface or both side surfaces of the mounting substrate, and the blade plate is formed in a fan shape that gradually expands from the inside to the outside in a plan view. Alternatively, the blade plate is integrally provided on one side surface or both side surfaces of the mounting substrate, and the blade plate is formed in an arc shape in a plan view.

Further, according to the present invention, an inner core and an outer core that is movable back and forth with respect to the inner core are provided, and a large number of molding partition walls are arranged at minute intervals on the inner peripheral side of the inner core. In addition, the present invention relates to a mold for a centrifugal fan, characterized in that each molding partition wall is formed in a thin plate shape having flexibility with substantially the same plate thickness.

Further, the present invention is also characterized in that the molding partition wall is formed in a substantially arcuate shape in cross section, and the plate thickness of the cross section is formed uniformly in the upper and lower die-releasing directions to eliminate the draft gradient. Have.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention comprises a disc-shaped mounting substrate connected to a power source, and a large number of plate-shaped blade plates integrally provided on the substrate and arranged at minute intervals in the circumferential direction. A narrow air outflow passage communicating with an air inflow opening formed in the central portion of the wing body formed by the respective vane plates and having a width of the air outflow passage. The blades are formed so as to be substantially the same from the inner peripheral side to the outer peripheral side.
With such a configuration, it has been possible to provide a quiet centrifugal fan that overturns the conventional wisdom that the air volume is reduced when the number of blades is large, and ensures a large air volume.

The vane plate can be integrally provided on one side surface or both side faces of the mounting substrate, and can be formed in a fan shape that gradually expands from the inner side to the outer side 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, the blade plate can be integrally provided on one side surface or both side surfaces of the mounting substrate, and the blade plate can be formed into an arc shape in a plan view. It is possible to obtain a multi-blade sirocco fan with high quietness.

In this case, it is preferable that the center of gravity of the vane is located on the line connecting the inner end of the vane formed in a plan view and the center of rotation of the blade.

That is, in the multi-blade sirocco fan, since the thickness of the blades is thin, the strength of the fan during rotation tends to be weak. Moreover, when the fan rotates, the center of gravity of the vane plate tends to move on the line connecting the center of rotation of the fan and the inner end of the vane plate. The greater the deviation from the line connecting the two, the greater the stress applied to the inner end of the blade. Therefore, as described above, the center of gravity of the blade is positioned on the line connecting the inner end of the blade and the center of rotation of the blade body to prevent the strength from decreasing as much as possible.

Further, at least a part of the mounting substrate can be communicated with the outside, and in this case, the movable die of the die for manufacturing the fan can be removed in the axial direction, which facilitates the production, and The mold structure is also simple.

At least a part of the end of the air outflow passage opposite to the mounting substrate can be communicated with the outside. In this case, the area of the air inflow opening is increased to further increase the air volume. Can be achieved.

The molding die for forming the centrifugal fan may have the following configuration.

That is, it is provided with an inner core and an outer core that can move forward and backward with respect to the inner core, and a large number of molding partition walls are arranged at minute intervals on the inner peripheral side of the inner core. The molding partition wall is formed in a thin plate shape having substantially the same plate thickness and flexibility.

As a result, the molding partition wall can be easily processed, and the molding die can be easily manufactured, so that the overall cost can be reduced.

In order to make the molding die simpler, it is preferable that the outer core moves back and forth in the axial direction with respect to the inner core. With such a construction, for example, in a plurality of axial directions. By arranging the molding dies in parallel, it becomes possible to mold a plurality of fans simultaneously.

Further, the outer core may be divided into a plurality of parts. At this time, if the plurality of outer cores are moved so as to gather together as they approach the inner core. When the mold is closed, it is possible to prevent the thin molding partition wall from interfering with the inner core and damaging or deforming, so that the mold can be securely closed.

Further, it is preferable that the large number of molding partition walls are detachably attached to the inner core, and even if some of them are deformed or damaged, only the corresponding ones can be replaced, which is economical.

Further, the molding die has a structure in which a ridge corresponding to the molding partition wall provided on the inner core is formed on the lower portion of the outer peripheral surface, and a center core which can be inserted and inserted into the inner core is provided. It is also possible to use such a center core, and it becomes easy to form the reinforcing rib portion on the lower portion of the blade plate.

By the way, in order to form the fan whose blade plate has an arc shape in a plan view, it is preferable to form the molding partition wall in 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, there is provided a support body in which a groove portion for sandwiching the inner lower end portion of the molding partition wall provided in the inner core is formed on the upper outer peripheral surface, and which is arranged in contact with the lower surface of the inner core. It is advisable to adopt a configuration provided with.

[0029]

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

(First Embodiment) First, the structure of the first embodiment of the centrifugal fan according to the present invention will be described.

The centrifugal fan shown in FIGS. 1 to 5 is a radial fan B constructed by arranging a plurality of thin blade plates 10 radially between two end plates made of an annular disc. Yes, a large number of such blades 10 form an annular wing body.

Of the two end plates consisting of an annular disc, one end plate forms a mounting substrate 11 for mounting on a rotary motor (not shown), and the base end of the wing body is formed on the inner surface of the outer peripheral portion. And a shaft mounting boss portion 13 formed of a short cylinder integrally projecting on the inner surface of the central portion thereof. 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 end plate 12 on the other side forms an air suction portion, and has an outer diameter equal to that of the blade body, and an air inflow opening 14 is provided in the central portion thereof.

Next, the structure of the annular blade body will be described. As shown in FIG. 3, the blade body has an air inflow space 15 communicating with the air inflow opening 14 therein and each blade plate. A narrow radial air outflow passage 16 is formed between each of the ten air passages 10, and the air outflow passage 16 has an inner peripheral side opening communicating with the air inflow space 15 and an outer peripheral side opening thereof. It communicates with the outside of fan B.

Width t of the radial air outflow passage 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 reason, the vane plate 10 has the structure 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 structure, in the molding die A described later, the molding partition wall 44 for forming the vane plate 10 and the air outflow passage 16 can be a flat plate having a simple shape. Since there is no need for processing, and even if there is a need for processing, this is facilitated, the manufacturing of the molding die A is facilitated, and the cost can be reduced.

Further, even if the air inflow opening 14 and the air inflow space 15 are large in diameter, 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 blade body, so that the quietness and the like can be improved. It has been experimentally confirmed that the performance deterioration of (1) can be suppressed as much as possible. Therefore, it becomes possible to arrange the motor (M) in the air inflow space (15), and the inner motor can be made compact. (See FIG. 12).

The fact that the width t of the air outflow passage 16 is substantially the same from the inner circumference side to the outer circumference side of the blade body also rectifies the air flow, and as described above, the air inflow opening 14 and the air inflow space are formed. Even if the radial length of the vane plate 10 is reduced in order to make the diameter 15 large, the noise can be sufficiently reduced.

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

Further, as shown in FIGS. 1 and 3, each of the rectangular vane plates 10 has the same width in one half of the end plate 12 side, but the other half of the mounting board 11 side is end plate. 12 to mounting board 11
Reinforcement rib 10 as tapered shape gradually widened toward
a.

Therefore, since the strength of the blade body is improved, the radial fan B can be rotationally driven at a high speed. At this time, the air inflow space 15 is depressurized and the external air is passed through the air inflow opening 14 to the air inflow space. 15 into the radial air outflow passage 16 formed between the vane plates 10 through the air inflow space 15 from all the inner peripheral side openings, and then the entire outer peripheral side of the air outflow passage 16 A large amount of air can be discharged from the opening to the outside.

By the way, the radial fan B according to the present embodiment, as shown in FIGS. 2 to 5, is provided with a large number of radial air outflow passages 16 on the mounting substrate 11 and provided in the blade 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.

Due to the presence of the window portion 17, as will be described later, the movable die of the forming die A can be moved in the axial direction of the radial fan B to be integrally formed, and the apparatus configuration of the forming die A becomes simple, The radial fan B can be manufactured at low cost and can be easily injection-molded with high molding accuracy.

By the way, in the above radial fan B, although not shown, the following modifications are possible.

Remove the end plate 12 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 portion 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 of the radial fan B is provided at the central portion in the axial direction of the blade body while leaving the peripheral rib portion 11a as it is.

The mounting board 11 of the radial fan B is provided in the central portion of the blade body in the axial direction while leaving the peripheral rib portion 11a, and the end plate 12 is eliminated.

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

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

(Second Embodiment) In the embodiment shown in FIG. 6, a large number of blade plates 10 are provided on both side surfaces of the mounting substrate 11 of the radial fan B.
Are integrally and radially arranged at minute intervals in the circumferential direction.

That is, the mounting substrate 11 is provided at the center of the wing body, the end plates 12 and 12 are provided at both ends of the wing body in the axial direction, and the peripheral ribs 12a are provided on both end plates 12 and 12, and the radial ribs are provided. The rectangular slit-shaped window portions 18, 18 are provided which circulate in conformity with the air outflow passage 16.

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

(Third Embodiment) In this embodiment, the air outlet 16
The end portion on the side opposite to the mounting substrate 11 has a structure in which at least a part thereof communicates with the outside.

FIGS. 7 to 9 show the radial fan B according to the first embodiment having a basic shape, in which not only the mounting substrate 11 but also the end plate 12 are aligned with the air outflow passage 16. A rectangular slit-shaped window portion 19 communicating with each other is provided, and the window portion 19 has a smaller area than the window portion 17 provided on the mounting substrate 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.

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

The peripheral rib portion 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 central portion in the axial direction of the blade body while leaving the peripheral rib portion 11a as it is.

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

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

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

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

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

(Fourth Embodiment) The radial fan B shown in FIG. 12 has a motor M disposed in the air inflow space 15 to make the radial fan B compact. 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) Next, as a mode of a centrifugal fan according to the present invention, a silent type multi-blade sirocco fan B'improved from a conventional sirocco fan will be described with reference to FIGS.
This will be described with reference to FIG.

The multi-blade sirocco fan B'has the blade plate 10 described above.
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, compared to 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 blade body is made larger than that in the first to fourth embodiments to increase the volume of the air inflow space 15 to increase the intake amount of air and the air flow rate. Is increasing.

Further, since the mounting board 11 is gently curved inward and the inner side surface is formed in a convex shape, the strength is increased, and in this way, the inner side surface of the mounting board 11 is gently curved. The convex shape allows the air to smoothly flow to the base end side of the vane plate 10, the air flow is made uniform, and the total air volume is also increased.

Moreover, also in this 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 blade body, so that the quietness can be secured. The centrifugal fan has excellent air volume, air pressure, and quietness.

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

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

Moreover, at the time of rotation, the center of gravity of the blade 10 is the center of rotation P of the multi-blade sirocco fan B'and the inner end of the blade 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 structure, the inner-outer diameter ratio of the multi-blade sirocco fan B'according to the present embodiment can be made relatively larger than that of the conventional centrifugal fan, and the inner motor can be used as in the fourth embodiment. Is possible.

Even when the motor M is arranged on the side of the mounting board 11, since the outer surface of the mounting board 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 plate 10 is attached to the mounting substrate.
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, a molding die A capable of integrally molding the radial fan B according to the above-described first to fourth embodiments will be described below with reference to FIGS. 17 to 26.

First, FIG. 17 shows the overall structure of the molding die A.
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 which can be moved by a moving device (not shown). Above the movable mounting plate 30, a movable mold 31, a fixed mold 32 and a stripper 33 are arranged in this order. The fixed-type mounting plate 34 is arranged 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 the fixed upper surface thereof, and a product projecting stripper 36 which is movable toward and away from the fixed die 32 is provided in the concave portion 35. .

A concrete structure of the product projecting 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.

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

The concrete construction 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 portion 43 made of a thick annular plate and the lower large-diameter base portion 43. It is composed of a large number of radial molding 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 fastening bolt insertion holes 45 are provided at regular intervals in the circumferential direction.

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

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

A large number of vane plate forming spaces 46 for forming a large number of vane plates 10 constituting the blade body of the radial fan B are formed between the adjoining molding partition walls 44, respectively. (See FIGS. 19 and 20).

In FIG. 21, reference numeral 44a denotes a projecting piece portion projecting from the upper end of the molding partition wall 44. By providing the projecting piece portion 44a, the radial air outflow passage 16 is provided to the end plate 12 of the radial fan B. It is possible to form a rectangular slit-shaped window portion 19 that is aligned with and communicates with the third window portion (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 molding partition wall 44 for forming the radial air outflow passages 16 of the radial fan B is formed of a thin flat plate having substantially the same plate thickness, the molding partition wall The processing is facilitated, the manufacturing of the molding die A is also facilitated, the equipment cost can be reduced, and the product cost can be reduced.

Moreover, since the molding 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.

Further, 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.

Then, in the outer core mounting recess 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 concrete structure of the outer core 49 is shown in FIGS. 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 protrude 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, whereby the partition wall fitting space is formed.
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, as shown in FIG. 24, an annular step portion 52 having a diameter slightly larger than the fitting space 51 is provided at the lower end of the partition wall fitting space 51 of the outer core 49. 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 a form of the outer core 49, for example, the core 49 is composed of four arc-shaped split 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).

By the way, as shown in FIGS. 17 and 19, the center core 54 is arranged in the center of the outer core mounting recess 48 provided on the lower surface of the fixed die 32 so as to be concentric with the outer core 49. I have set up. 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.

Therefore, when the radial fan B is molded, the reinforcing rib portion 10a is formed on the base portion of the blade plate 10 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 elongated vertical gate 62 having a diameter 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 connected to the pin insertion recess 60 of the center core 54.
When inserted into the center pin, the outer peripheral surface of the center pin 80 and the pin insertion recess
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 shown in FIG.
As shown in FIG. 5, an annular step 64 is formed.
As shown in FIG. 17 and FIG.
Attach 65.

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

Next, the resin inflow path for injecting the molding resin into the vane plate molding space 46, the peripheral rib molding space 53, and the end plate forming space 66 will be described. At the molding position shown in FIG. A rocket ring 70 is provided in the center of the fixed type mounting plate 34, and a spool 71 is concentrically arranged inside the ring 70 so as to penetrate the fixed type mounting plate 34 and the stripper 33. A vertical resin injection flow path 72 is provided at the center of 71.

Further, on the upper surface of the fixed mold 32, a horizontal resin injection flow path is formed by connecting the lower end opening and the start end of the vertical resin injection flow path 72.
73 are provided.

On the other hand, the end of the horizontal resin injection flow path 73 is shown in FIG.
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 channels 72, 73 through a pressure-feed flow channel (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.

Explaining the removal of the molded product, as shown in FIGS. 17 and 19, the product projecting stripper 36 is connected to the product projecting pin 75 whose base end is connected to the product projecting plate 76. When the product projecting plate 76 is projected upward, the product projecting pin 75 and the product projecting stripper 36 integral with the product projecting pin 75 are integrally projected, and the radial fan B is extruded to the outside and can be taken out. it can.

Next, the separation of the runner R will be described. As shown in FIGS. 17 and 19, the runner lock pin 77 is incorporated in the fixed die mounting plate 34 and the stripper 33, and the runner R after molding has the same lock pin. Although locked at the lower end of 77, the lock of the runner R is forcibly released by moving the stripper 33 relative to the fixed die mounting plate 34, and the runner R is disengaged as shown in FIG. 29. You can

Further, with reference to FIG. 17 and FIG. 19, another structure of the above-mentioned forming die A will be described.

In the figure, 80 is the above-mentioned center pin,
The base end is connected and fixed to the movable mounting plate 30 with fastening bolts 81, and the tip protrudes from the product, and after passing through the center pin insertion hole 37 provided at the center of the stripper 36, the center core
It extends into the pin insertion recess 60 of the 54. Therefore, a 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. The shaft mounting part forming space 63 and the ring gate 61
Is in communication with

Here, referring to FIGS. 27 to 31,
A process of manufacturing the radial fan B according to the present embodiment using the above-mentioned forming die 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 die 31, a fixed die 32, and a stripper on a movable die mounting plate 30.
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 channels 72, 73 through the pressure-fed channel 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) This step relates to gate cutting. After the molding resin has hardened, as shown in FIG. 28, the movable device is driven to move the movable 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, since the radial fan B is connected to the runner R only through the lower end of the narrow vertical resin injection hole 74, the runner R can be separated by a slight detaching force. 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 die 32. As shown in FIG. 29, the movable device is driven to move the movable die mounting plate 30 and the movable die 31. Is released from the fixed mold 32. With this separation, the radial fan B is also released from the fixed die 32.

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

(Step 4) This step relates to the protrusion of the radial fan B, and 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 shown in FIG. 30 is clamped again to the state shown in FIG. 27, and the radial fan shown in steps 1 to 4 is processed. This enables the B molding work. 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 moves back and forth with respect to the inner core 41 in the axial direction, the structure of the mold is simpler than that of the structure in which the outer core moves back and forth in a radial direction, and the molding die A is The outer core 49, the inner core 41, the product projecting stripper 36, and the center core 54 can be arranged side by side in a plurality of axial directions, respectively. It can be further reduced.

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

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

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

The overall structure of the molding die A'is as shown in FIG. 31, and basically, similar to the molding die A described above, the outer core 49 and the center core 54 are fastened to the fixed die 32 with fastening bolts. A partition wall 44 for molding for molding the blade plate 10 of the multi-blade sirocco fan B'on the movable die 31 by connecting and fixing (not shown).
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 mold C, as shown in FIG. 31, a partition wall base support 86 is fitted on an annular pedestal 85, and a center pin insertion cylinder 87 is fitted on the support 86, An inner core 41, to which a large number of molding partition walls 44 are attached, is fitted around the upper half of the cylindrical body 87.

In the inner core 41, a cylindrical body insertion hole 93 is formed at the center of the mounting substrate molding convex portion 41b which is gently curved toward the center core 54 side (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.

Then, 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 into the same pin insertion recess 60. Space for molding the shaft mounting part due to the tip of
63 are formed.

Further, as shown in FIG. 32, a large number of partition wall insertion groove portions 41a formed in an arc shape are formed in an annular shape at the peripheral edge portion of the mounting board molding convex portion 41b, and each partition wall insertion groove portion is formed. The partition walls 44 for molding shown in FIG. 33 are respectively inserted in 41a.

As shown in FIG. 33 (b), the molding partition wall 44 according to this embodiment is, of course, formed in a thin arc shape in cross section. t '
Are uniformly formed in the upper and lower mold release 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 portion of the molding partition wall 44 inserted into the partition wall insertion groove portion 41a of the inner core 41 is 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, 91 is an end face 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 will not be described.

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.

Furthermore, a multi-blade sirocco fan which is a molded product
Explaining the removal of B ', the molding die A' has a movable die 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-described 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 structure of the mold is simpler than that of the structure that advances and retracts radially, and the outer core 49 and the lower mold C can be arranged side by side in a plurality of axial directions. Therefore, the multi-blade described in the fifth embodiment The sirocco fan B'can be easily mass-produced by integral molding, and the cost can be reduced.

[0140]

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

(1) The width of the air outflow passage is formed to be substantially the same from the inner peripheral side to the outer peripheral side of the blade body, and the blade plate is gradually expanded from the inner side to the outer side in plan view. By forming the fan-shaped partition wall, it is not necessary to process the molding partition wall, and even if there is a need, it will be easier to process it.
The mold itself can be easily manufactured.

Further, since the strength of the blade plate constituting the blade body is improved and the blade can withstand high speed rotation, a large air volume can be achieved.

Even if the inner diameter of the blade body is increased, the performance is not deteriorated so that the inner motor can be used and the fan can be made compact.

(2) A vane plate is integrally provided on one side surface or both side faces of the mounting substrate, and the vane plate is formed in an arc shape in a plan view, so that the air volume, wind pressure, and quietness can be improved. it can.

(3) Since the center of gravity of the blade plate is located on the line connecting the inner end of the arc plate in plan view and the center of rotation of the blade body, the strength is reduced even if the blade plate is thin. Can be prevented as much as possible.

(4) At least a part of the mounting board communicates with the outside, so that the movable die is removed in the axial direction.
It is easy to manufacture and the mold structure is simple.

(5) At least a part of the end portion of the air flow path on the side opposite to the mounting substrate is communicated with the outside, so that the inflow opening area of the air is increased and the air volume can be increased.

(6) An inner core and an outer core that is movable back and forth with respect to the inner core are provided, and the inner peripheral side of the inner core is
By arranging a large number of molding partition walls radially at minute intervals and forming each molding partition wall with a thin flat plate of approximately the same plate thickness, the molding partition wall can be easily processed. As a result, the mold can be easily manufactured, and the overall cost can be reduced.

(7) The partition wall for molding is formed in a substantially arcuate shape in cross section, and the plate thickness of the cross section is formed uniformly in the upper and lower die removal directions to eliminate the draft gradient. It becomes possible to easily form a multi-blade sirocco fan which is excellent in wind pressure and quietness, and moreover, the forming die structure becomes simple and the die cost can be reduced.

(8) Since the outer core moves back and forth in the axial direction with respect to the inner core, the structure of the mold is simplified, and the molding parts of the molding die are arranged side by side in the 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. (9) The outer core is divided into a plurality of pieces, and the divided outer cores are configured to move so as to gather as they approach the inner core. The wall can be prevented from interfering with the inner core and being damaged or deformed, and the mold can be securely closed.

(10) If all the molding partitions are integrally molded, it is uneconomical to replace all the partition walls even if part of them is deformed or damaged. Deformation due to detachable attachment of the wall to the inner core
It is economical because only the damaged one can be replaced easily, and the molding partition wall is simple in construction.

(11) By forming a ridge corresponding to the molding partition wall provided on the inner core on the lower portion of the outer peripheral surface and providing a center core which can be inserted and inserted into the inner core, The reinforcing rib portion of the vane plate can be easily formed, and a centrifugal fan having high strength can be formed. Further, the shaft mounting boss portion can be easily molded.

(12) A support body is provided on the upper outer peripheral surface of which a groove portion for sandwiching the inner lower end portion of the molding partition wall provided on the inner core is formed, and which is arranged in contact with the lower surface of the inner core. Since the structure is adopted, the structure of the molding die is simplified and the die cost can be reduced.

From the above, it is possible to provide at low cost a centrifugal fan that has a compact shape, a large air volume, and is quiet.

[Brief description of the drawings]

FIG. 1 is a partial cutaway perspective view of a centrifugal fan according to a first embodiment formed by a manufacturing die 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.

FIG. 7 is a vertical cross-sectional view of a centrifugal fan according to a third embodiment.

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

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

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

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

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

FIG. 13 is a vertical sectional view of a centrifugal fan according to a fifth embodiment.

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

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

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

FIG. 17 is a vertical sectional view of a molding die 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 vertical cross-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 vertical cross-sectional view showing another form of the molding die 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 (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // B29L 31:08

Claims (14)

[Claims] 1. A disc-shaped mounting board (1) connected to a power source.
1) and a large number of plate-shaped blade plates (10) integrally provided on the same substrate (11) and arranged at minute intervals in the circumferential direction, and formed between the blade plates (10) respectively. A narrow width air outflow passage (16) communicating with the air inflow opening (14) formed in the central portion of the wing body constituted by the plate (10), and the width of the air outflow passage (16).
A centrifugal fan in which (t) is formed so as to be substantially the same from the inner peripheral side to the outer peripheral side of the blade body. 2. The blade plate (10) is integrally provided on one side surface or both side surfaces of the mounting substrate (11), and the blade plate (10) is also provided.
The centrifugal fan according to claim 1, wherein the (10) is formed in a fan shape that gradually expands from the inner side toward the outer side in a plan view. 3. The blade plate (10) is integrally provided on one side surface or both side surfaces of the mounting substrate (11), and the blade board (1)
The centrifugal fan according to claim 1, wherein 0) is formed in an arc shape in a plan view. 4. The vane plate (10) formed in an arc shape in a plan view.
The blade (10) is located on the line connecting the inner end of the blade and the center of rotation of the wing.
The centrifugal fan according to claim 3, wherein the center of gravity of the centrifugal fan is located. 5. The centrifugal fan according to claim 1, wherein at least a part of the mounting substrate (11) communicates with the outside. 6. The end portion of the air outflow passage (16) opposite to the mounting substrate (11) has at least a part thereof communicating with the outside. Centrifugal fan described in. 7. The inner core (41), comprising an inner core (41) and an outer core (49) capable of advancing and retracting with respect to the inner core (41).
A large number of molding partition walls (44) are arranged at minute intervals on the inner peripheral side of the, and each molding partition wall (44) is formed into a thin plate shape having approximately the same plate thickness and flexibility. A mold for a centrifugal fan characterized in that 8. The partition wall (44) for molding is formed in a substantially arcuate shape in cross section, and the plate thickness of the cross section is formed uniformly in the upper and lower die-releasing directions to eliminate the draft gradient. The centrifugal fan molding die according to claim 7. 9. The mold for a centrifugal fan according to claim 7, wherein the outer core (49) moves back and forth in the axial direction with respect to the inner core (41). 10. The mold for a centrifugal fan according to claim 7, wherein the outer core (49) is divided into a plurality of pieces. 11. The outer core (49) divided into the plurality of parts.
The mold for a centrifugal fan according to claim 10, wherein the molds move so as to gather as they approach the inner core (41). 12. The molding of a centrifugal fan according to claim 7, wherein the plurality of molding partition walls (44) are detachably attached to the inner core (41). Type. 13. A center which is formed on a lower portion of an outer peripheral surface of a ridge corresponding to a molding partition wall (44) provided on the inner core (41) and which can be freely inserted into the inner core (41). The mold for a centrifugal fan according to claim 7, further comprising a core (54). 14. A groove portion for sandwiching an inner lower end portion of a molding partition wall (44) provided in the inner core (41) is formed on an upper outer peripheral surface and is in contact with a lower surface of the inner core (41). The mold for a centrifugal fan according to any one of claims 7 to 12, characterized in that the mold is provided with a support disposed in (4).