JP2014238037A - Vibration isolator for blast fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolator for a blast fan, which solves various problems newly caused when the blast fan is formed in an external cylinder of a conventional vibration isolator.SOLUTION: A vibration isolator of the present invention is a vibration isolator for a blast fan, which has an external cylinder for holding the blast fan and which has an internal cylinder coupled to its inside via an elastic member. A holding area for the blast fan is provided on the outer peripheral surface of the external cylinder. The holding area is a flange part that is provided at the end of the external cylinder, and an outer peripheral surface of the flange part comprises one or more inclined planes and one or more cavity parts depressed with respect to the inclined plane.

Description

  The present invention relates to a vibration isolator for a blower fan installed in an air conditioner such as a so-called air conditioner (air conditioner), an electronic device, or the like.

  As a blower fan structure, it is possible to prevent electromagnetic vibration from the motor from being propagated throughout the blower fan, reduce manufacturing man-hours, reduce material costs, reduce weight, and improve recyclability. For the purpose, as shown in FIG. 5, an all-resin vibration isolator 50 in which an outer cylinder 51 made of a thermoplastic resin and an inner cylinder 52 are connected by an elastic member 53 made of a thermoplastic elastomer is used as an insert part. It is known that a blower fan is used for injection molding. (For example, refer to Patent Document 1.)

  More specifically, as shown in the figure, after the vibration isolator 50 is inserted into the movable mold D1, the movable mold D1 is moved in the direction of the fixed mold D2 and clamped, and the movable mold D1 and the fixed mold D2 By injecting the thermoplastic resin into the cavity C4 formed between the two through the gate G as shown by the arrow m, a blower fan structure including the vibration isolator 50 is formed.

JP2003-56492A.

However, in forming the blower fan structure, the outer cylinder 51 (particularly, the peripheral wall 51a) of the vibration isolator 50 has a high filling pressure (200 to 400 kg / cm ² ), as shown by the arrow in FIG. Temperature (200-300 ° C.) is added. In this case, if the outer cylinder 51 of the vibration isolator 50 is deformed, tilted, misaligned or the like in the movable mold D1, the fan structure taken out from the movable mold D1 is also accompanied by the eccentricity of the inner cylinder 52, etc. There is a possibility that unbalance occurs and vibrations and abnormal noise occur.

  As a means for solving this, it is conceivable to increase the thickness of the outer cylinder 51 in order to increase the rigidity of the outer cylinder 51. However, there is room for improvement in terms of material cost by increasing the amount of resin used. .

  On the other hand, in forming the outer cylinder 51, it is conceivable to select a resin to be used and suppress the influence on the outer cylinder 51 due to the filling temperature and the filling pressure. In this case, the strength such as bending strength and tensile strength is considered. Further, since it is necessary to select a resin including various physical properties represented by rigidity such as bending elastic modulus and heat resistance such as heat deformation temperature, there is room for improvement in terms of material cost.

  In addition, if the outer cylinder 51 is made thicker, it takes time to cool the inside of the mold, so that the molding cycle per unit becomes longer, so that the work efficiency is deteriorated and the manufacturing cost due to this is reduced. There is room for improvement.

  In addition, when trying to injection-mold a single part thickly, the thicker the thickness, the greater the resin shrinkage that occurs at each part during cooling, which may cause warping and sink marks on the outer cylinder 51. There is room for improvement in terms of quality.

  Considering these problems, even if suitable manufacturing conditions are determined, the yield is expected to deteriorate due to variations in manufacturing conditions, etc., so it is necessary to increase the number of inspection items accordingly, manufacturing management. There is room for improvement in the cost of spending.

  On the other hand, the conventional vibration isolator 50 is provided with a flange 51b at one axial end portion of the outer cylinder 51, and as a result, the rigidity of the entire outer cylinder 51 is increased, but the flange 51b has a large diameter. This will leave room for improvement in terms of material costs.

  Further, when the outer cylinder 51 is provided with the flange 51b, the number of moldings per die is reduced, which is disadvantageous for molding for the purpose of obtaining a large number of pieces, and there is room for improvement.

  Further, the problem that high temperature and high pressure is applied to the outer cylinder 51 does not occur only at the time of forming the fan structure for blowing, but when the outer cylinder 51 and the inner cylinder 52 are connected by the elastic member 53, for example, This problem may also occur when the elastic member 53 is vulcanized with synthetic rubber or when the elastic member 53 is injection molded with an elastomer.

  That is, in the conventional vibration isolator shown in FIG. 5, in solving various problems caused by high temperature and high pressure applied to the outer cylinder of the vibration isolator, cost increases, work efficiency deteriorates and product quality varies. In addition, in suppressing these, manufacturing management is complicated and there is a limit to this management, and further, the conventional technique is disadvantageous for molding for the purpose of taking a large number of pieces. The purpose of the present invention is to provide a blower fan vibration isolator that solves these problems and a blower fan structure including the same.

  A vibration isolator for a blower fan according to a first aspect of the present invention for solving the above problems has an outer cylinder for holding the blower fan, and an inner cylinder is connected to the inner cylinder via an elastic member on the inside thereof. A holding area for the blower fan is provided on the outer peripheral surface of the outer cylinder, and the holding area is a flange provided at an end of the outer cylinder, and the outer peripheral surface of the flange is one. An anti-vibration device for a blower fan comprising: at least one inclined surface and at least one indented portion that is recessed from the inclined surface.

According to the first invention, the following effects are exhibited. Of the outer peripheral surface of the outer cylinder, a flange is provided at the end of the outer peripheral surface as a holding area for the blower fan. The collar part is comprised from one or more inclined surfaces and one or more hollow parts depressed rather than the said inclined surface. The outer peripheral surface of the collar portion, which is the holding region, is partially inclined, and the force for deforming the vibration isolator due to the resin pressure received by the holding region during molding is reduced.
Moreover, the collar part which is a holding | maintenance area | region of a vibration isolator is equipped with the hollow part depressed not only from the inclined surface but from the inclined surface. Therefore, since the resin is filled in the hollow portion at the time of molding, even if the area of the outer peripheral surface of the collar portion which is the holding region is reduced for the purpose of reducing the force by the resin pressure when the vibration isolator is integrally formed with the blower fan, The rotational force of the drive motor of the blower fan can be reliably transmitted to the blower fan.
Furthermore, according to the vibration isolator which is this invention, the deformation | transformation which arises by adding high temperature and a high pressure to an outer cylinder can also be suppressed, without thickening an outer cylinder or providing a flange in an outer cylinder.

  A vibration isolator for a blower fan according to a second aspect of the present invention is characterized in that, in the first aspect, the flange portion is provided with ring-shaped recesses on both sides perpendicular to the axial direction of the vibration isolator. .

  According to the second invention, the following effects are exhibited. Concave portions are provided in a ring shape on both surfaces perpendicular to the axial direction of the vibration isolator of the collar portion as the holding region. Since the fixed mold and the movable mold for blower fan molding are provided with a ring-shaped protrusion that fits into this recess, the protrusion of the mold even if resin pressure is applied to the outer peripheral surface of the flange Can counteract the force caused by the resin pressure and prevent deformation of the vibration isolator.

  The vibration isolator for a blower fan according to a third aspect of the present invention is characterized in that, in the first aspect or the second aspect, the inclined surface and the recessed portion are alternately arranged over the outer periphery of the flange portion.

  According to the third aspect of the invention, since the holding area of the vibration isolator is alternately arranged with the inclined surface and the recessed portions that are recessed from the inclined surface, the force is increased by the resin pressure when the vibration isolator is integrally formed with the blower fan. Even if the area of the outer peripheral surface of the flange portion is reduced for the purpose of reducing the pressure, since the resin is filled in the recess during molding, the rotational force of the drive motor of the blower fan can be more reliably transmitted to the blower fan. .

  A vibration isolator for a blower fan according to a fourth aspect of the present invention is the anti-vibration device according to any one of the first to third aspects, wherein at least one of the end portions of the outer cylinder is a protruding portion protruding from the elastic member. It is characterized by that.

  According to the fourth invention, in the vibration isolator according to the present invention, if at least one of the end portions of the outer cylinder is a protruding portion protruding from the elastic member, the protruding portion is positioned with respect to the mold. Since it can utilize as a site | part for use and holding | maintenance, the deformation | transformation which arises when high temperature and a high pressure are added with respect to an outer cylinder can be suppressed more effectively. For this reason, the fan structure for ventilation shape | molded using such a vibration isolator is maintained in the state where the vibration proof function is better.

  In order to solve the above-mentioned problems, a blower fan structure according to a fifth aspect of the present invention includes a vibration isolator according to any one of the first to fourth aspects of the present invention, and the air flow retained by the flange of the outer cylinder of the vibration isolator. And a fan.

  According to the fifth aspect, the following effects are exhibited. When the blower fan structure having the vibration isolator and the blower fan is integrally formed using the above vibration isolator of the present invention, the deformation of the outer cylinder in the vibration isolator is suppressed, The anti-vibration function is not impaired by the deformation or eccentricity of the tool. Therefore, according to the blower fan structure of the present invention, the vibration isolation function can be maintained without increasing the thickness of the outer cylinder or providing a flange on the outer cylinder.

(A)-(c) is the perspective view which shows the vibration isolator 10 which is one form of the vibration isolator which is this invention from the one end surface, sectional drawing of the vibration isolator 10, and vibration isolator 10 others It is a perspective view shown from the one end surface. (D) And (e) is an enlarged view of the collar part of the vibration isolator 10. FIG. It is a perspective view which shows the turbofan structure which is one form of this invention which integrally shape | molded the turbofan using the vibration isolator of FIG. 1 from the small diameter side end surface (opposite side of a collar part) of a vibration isolator outer cylinder. . FIG. 3 is an essential part cross-sectional view showing, in an enlarged manner, a state immediately before mounting the vibration isolator of FIG. 1 on a movable mold in forming the turbofan structure of FIG. 2. FIG. 4 is an enlarged cross-sectional view of a main part showing a state where a movable mold and a fixed mold are clamped after the state of FIG. 3. It is principal part sectional drawing which expands and shows the state which attached the conventional vibration isolator 50 to the movable mold | type, and clamped the movable mold | type and the fixed mold | type. It is principal part sectional drawing which expands and shows the state which attached the conventional vibration isolator 60 to the movable mold | type, and clamped the movable mold | type and the fixed mold | type.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1A to 1C are perspective views showing a vibration isolator 10 as one embodiment of the vibration isolator according to the present invention from one end face, a cross-sectional view of the vibration isolator 10, and the vibration isolator 10 respectively. It is a perspective view which shows from the other end surface. FIG. 1D is an enlarged cross-sectional view of a portion where the outer peripheral surface of the flange portion S is an inclined surface T. Furthermore, FIG.1 (e) is an expanded sectional view of the part whose outer peripheral surface of the collar part S is the hollow part K. FIG.

  Reference numeral 11 denotes an outer cylinder formed by injection molding using a thermoplastic resin. As shown in the figure, the outer cylinder 11 has a flange S formed at the end of its outer peripheral surface.

  As shown in the enlarged view of FIG. 1B, the flange portion S has a ring-shaped concave portion M with respect to a vertical plane f1 perpendicular to the axis O direction and a perpendicular perpendicular to the axis O direction. A ring-shaped recess N is provided for the surface f2. Moreover, the outer peripheral surface of the outer cylinder 11 is comprised from the large diameter side area surface f3 with a large outer diameter, and the small diameter side area surface f4. The large-diameter side region surface f3 corresponds to the outer peripheral surface of the flange portion S, and the concave portion M and the concave portion N have a function of allowing a part of a mold described later to enter here. The position of the flange portion S is not limited in which position in the direction of the axis O of the outer cylinder, but is preferably provided in the vicinity of the end of the outer cylinder.

  Moreover, as shown in FIG.1 (c), as for the collar part S, the outer peripheral part is alternately arrange | positioned the inclined part T and the hollow part K depressed from the inclined surface. The inclined surface T and the depression K of the vibration isolator are a part that is integrated with the molding resin of the blower fan.

  Reference numeral 12 denotes an inner cylinder formed by injection molding using a thermoplastic resin. The inner cylinder 12 is connected to the inner side of the outer cylinder 11 via an elastic member 13, and has a fitting hole 10a to which a rotating shaft connected to a motor or the like is connected.

  The elastic member 13 is formed by inserting the outer cylinder 11 and the inner cylinder 12 into the same molding die (molding die for the vibration isolator of the present invention) and using thermoplastic elastomer or vulcanized rubber as the main raw material. Is done.

  In the outer cylinder 11 according to this embodiment, the inner peripheral surface f5 of the outer cylinder 11 is provided with a stepped portion L1 on the “large-diameter side end surface” e1 side of the outer cylinder 11. Further, a step portion L2 is provided on the “small diameter side end face” e2 side of the inner peripheral surface f5. The shape of the inner peripheral surface of the outer cylinder 11 is not limited to this, and may be, for example, an inclined surface shape in which the thickness of the large-diameter side region surface f3 and the thickness of the small-diameter side region surface f4 are different.

  Moreover, as shown in FIG.1 (b), the outer cylinder 11 becomes the protrusion part P which the edge part on the opposite side to the collar part S protruded rather than the elastic member 13. As shown in FIG.

  FIG. 2 is an explanatory view of one embodiment of the present invention in which the turbo fan 20 is integrally formed using the vibration isolator 10 of FIG. FIG. 3 is a perspective view showing the turbofan structure 1 from the side opposite to the flange S (see FIG. 1) of the vibration isolator outer cylinder 11; The vibration isolator outer cylinder 11 is integrally formed with the hub 22 of the main plate 21 of the turbofan 20.

  As shown in FIG. 2, the main plate 21 of the turbofan has a convex hub 22 formed so as to cover the motor at the center thereof, and the shaft of the motor at the center of the hub 22 in the height direction (FIG. 2). The vibration isolator 10 is inserted and fixed in the vertical direction. Further, as shown in FIG. 2, a plurality of blade members 23 are disposed on the peripheral edge of the main plate, and the plurality of blade members are connected to the shroud 24 to constitute the turbo fan 20. Hereinafter, the turbo fan 20 in which the vibration isolator 10 is integrally formed is referred to as a turbo fan structure 1.

  Here, FIGS. 3 and 4 are enlarged cross-sectional views showing a state immediately before the vibration isolator 10 is attached to the movable mold D1 when the turbofan structure 1 is molded, and then the movable mold D1. It is principal part sectional drawing which expands and shows the state which clamped the fixed mold | type D2.

  Reference sign D1 is a movable type. The movable die D1 has a recess D for holding the vibration isolator 10. The recess D surrounds the surface F3 against which the small diameter side end surface e2 (the side opposite to the flange S) of the vibration isolator outer cylinder 11 abuts, the deepest surface F4, and the small diameter side region surface f4 of the vibration isolator outer cylinder 11. Shaft portion Ds formed by peripheral surface F2 and protrusion F1 that fits into ring-shaped recess M of flange S of vibration isolator, and through deepest surface F4 through which fitting hole 10a of vibration isolator 10 penetrates. Are integrally formed. F5 is a molding surface of the main plate 21.

  Reference sign D2 is a fixed type. As shown in FIG. 4, the fixed mold D2 is a protrusion that fits into the mating surface F6 (molded surface of the main plate 21) and the ring-shaped recess N of the flange S of the vibration isolator in a clamped state with the movable mold D1. A stepped portion Dr is provided in which the protrusion D6 and the projection f6 of the elastic member 13 of the vibration isolator 10 are fitted. A cavity C is formed between the molding surface F5 of the main plate 21 of the movable mold D1 and the mating surface F6 of the fixed mold D2. This cavity becomes a cavity C for molding the hub 22 which is a part of the main plate 21. 3 and 4, the cavity C indicates a part of the molded portion of the main plate 21.

  That is, when the turbofan structure 1 is molded using the vibration isolator 10, first, as shown in FIG. 3, the vibration isolator 10 is inserted along the shaft portion Ds into the recess D of the movable die D1. At this time, the ring-shaped concave portion M of the flange portion S of the vibration isolator 10 is fitted into the protrusion portion F1 of the mold. Next, the movable mold D1 is moved to the fixed mold D2 and clamped.

  At this time, the vibration isolator 10 inserted in the movable mold D1 is guided by the shaft portion Ds of the fixed mold D2. Furthermore, the protruding portion Dn of the mold is fitted into the ring-shaped recess N of the flange portion S of the vibration isolator 10. At the same time, the stepped portion Dr is fitted into the protrusion f6 of the elastic member of the vibration isolator 10. After clamping the movable mold D1 and the fixed mold D2, a thermoplastic resin is pumped from the gate G of the fixed mold D2, and this thermoplastic resin is inside the cavity formed between the movable mold D1 and the fixed mold D2. Are filled in the direction of arrow m.

  At this time, the protrusion F1 of the movable mold D1 is in close contact with the ring-shaped recess M of the flange S of the vibration isolator, and the protrusion Dn of the fixed mold D2 is in close contact with the ring-shaped recess N of the flange S. Therefore, as shown in FIG. 4, the thermoplastic resin is integrated so that the flange S (see FIG. 3) of the vibration isolator outer cylinder 11 is wrapped with the resin, and the turbofan structure 1 is formed.

  In short, the vibration isolator 10 according to the present invention has a flange S formed at the end portion of the outer peripheral surface of the vibration isolator outer cylinder 11 and is shown in enlarged views (d) and (e) of FIG. Thus, a ring-shaped recess M is provided for a vertical surface f1 orthogonal to the axis O direction, and a ring-shaped recess N is provided for a vertical surface f2 orthogonal to the axis O direction. . A mold protrusion F1 is fitted into the recess M, and a mold protrusion Dn is inserted into the recess N. Therefore, the area of the region used for integrally molding the vibration isolator to the turbo fan 20 can be made to be the inclined surface T and the recessed portion K of the flange portion S, and can be made much smaller than before. Thereby, the force which the outer peripheral surface of the collar part S of the outer cylinder 11 receives by the resin pressure can be remarkably reduced in the pressure receiving area of the resin pressure at the time of molding.

  Therefore, according to the vibration isolator 10 of this embodiment, the vibration isolator outer cylinder 11 is thickened, or the vibration isolator outer cylinder 11 is subjected to high temperature and high pressure without providing a flange on the vibration isolator outer cylinder 11. The deformation caused by the addition can be suppressed.

  In addition, when the turbofan structure 1 is formed using the vibration isolator 10, the vibration isolator 10 is deformed or eccentric because the deformation of the vibration isolator outer cylinder 11 is suppressed. Therefore, the anti-vibration function is not impaired. Therefore, according to the turbofan structure 1, the vibration isolator outer cylinder 11 can be thickened or the vibration isolator function can be maintained without providing the vibration isolator outer cylinder 11 with a flange.

  On the other hand, it is possible to integrally mold the turbo fan 20 using the conventional vibration isolator 60. The vibration isolator 60 shown in FIG. 6 includes an outer cylinder 61, an inner cylinder 62, and an elastic member 63. However, as shown in FIG. 6, the collar portion 64 of the outer cylinder 61 of the vibration isolator has a configuration in which a holding region that comes into contact with the resin is large during molding and is easily deformed by receiving a large force due to the resin pressure. The reason why the area of the holding region of the conventional vibration isolator 60 is large in this way is to ensure that the vibration isolator and the fan body are held when the turbofan is driven. However, since the area of the holding region is large, the vibration isolator during molding is deformed by receiving a large force due to the resin pressure. Therefore, there is a problem that it is difficult to determine the molding conditions.

  On the other hand, the vibration isolator 10 of the present invention is configured to receive the resin pressure only at the small outer peripheral portion of the flange portion S in order to prevent the vibration isolator from being deformed by the resin pressure received during molding. Moreover, the area of the outer peripheral part of the collar part S is small, and the force received by resin pressure is small. Therefore, in order to improve the holding ability with the fan body, the shape of the flange portion S is devised, the inclined surface T and the recess portion K are alternately arranged on the outer peripheral portion of the flange portion S, and the ring S is attached to the flange portion S. The structure which integrated with the fan main body so that the shape recessed part M and the recessed part N were provided and the rope part S was wrapped with resin was employ | adopted.

  The present invention is particularly effective when the outer cylinder of the vibration isolator is made of a synthetic resin such as a thermoplastic resin, but is also applicable when the outer cylinder of the vibration isolator is made of a metal such as an aluminum alloy. it can.

  The vibration isolator according to the present invention is not limited to the axial flow fan and the centrifugal fan, but can be applied to a blower fan such as a mixed flow fan or a cross flow fan (cross flow fan) to form a blower fan structure. .

1 Propeller fan structure (fan structure for ventilation)
10 Vibration isolator (Invention product)
10a Shaft fitting hole 11 Outer cylinder 12 Inner cylinder 13 Elastic member 20 Turbo fan (fan for blowing according to the present invention)
21 Main plate 22 Hub 23 Blade 24 Shroud 50 Vibration isolator (conventional product)
51 outer cylinder 51a peripheral wall 51b flange 52 inner cylinder 53 elastic member 60 vibration isolator (conventional product)
D Movable mold side recess D1
Movable type D2
Fixed type Dn protrusion (ring shape)
Dr Stepped part (ring shape)
e1 Large-diameter axial end face (outer cylinder)
e2 Small-diameter side axial end face (outer cylinder)
f1 Vertical plane (buttock)
f2 Vertical plane (buttock)
f3 Large-diameter side area surface of outer cylinder outer periphery (saddle S)
f4 Small-diameter side area surface of outer periphery of outer cylinder f5 Inner peripheral surface of outer cylinder part f6 Projection part of elastic member C Cavity F1 Projection part (ring shape)
F2 Inner peripheral surface F3 Abutting surface F4 Deepest surface F5 Movable mold forming surface F6 Fixed mold side mating surface G Gate K Recessed portion L1, L2 Stepped portion M Recessed portion N Recessed portion O Shaft (axial center)
P projecting part S buttock T inclined surface

Claims (5)

A vibration isolator for a blower fan having an outer cylinder for holding a blower fan and having an inner cylinder connected to the inner cylinder via an elastic member,
A holding area for the blower fan is provided on the outer peripheral surface of the outer cylinder,
The holding area is a collar provided at an end of the outer cylinder,
An antivibration device for a blower fan, wherein an outer peripheral surface of the flange portion is composed of one or more inclined surfaces and one or more recessed portions that are recessed from the inclined surfaces.   2. The vibration isolator for a blower fan according to claim 1, wherein the flange portion is provided with ring-shaped concave portions on both side surfaces perpendicular to the axial direction of the vibration isolator.   The anti-vibration device for a blower fan according to claim 1 or 2, wherein the inclined surface and the recessed portion are alternately arranged over an outer periphery of the flange portion.   4. The vibration isolator for a blower fan according to claim 1, wherein at least one of the end portions of the outer cylinder is a protruding portion protruding from the elastic member. 5. 5. A blower fan structure comprising: the vibration isolator according to claim 1; and a blower fan held by the flange portion of the outer cylinder of the vibration isolator.

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