JP5367785B2 - Vibration isolator for blower fan and blower fan structure including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-isolating tool for a blower fan capable of solving various kinds of newly occurring problems when forming the blower fan on the outer cylinder of the conventional vibration-isolating tool, and a blower fan structure having the same. <P>SOLUTION: The vibration-isolating tool of a fan 20 has an outer cylinder 11 for holding the propeller fan 20, and an inner cylinder 12 is connected to the inner side of the outer cylinder 11 via an elastic member 13. A step S is formed over the entire circumference of an outer circumferential surface in the outer cylinder 11. A large diameter side area surface f2 partitioned by the step S forms an area for golding the hub 21 of the fan 20. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

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, and the like, and a blower fan structure including the same.

  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 example, as shown in FIG. 14, an all-resin vibration isolator 50 in which an outer cylinder 51 and an inner cylinder 52 made of a thermoplastic resin 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) and a high temperature as shown by the arrows in the figure. (200 to 300 ° C.). 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 blower fan structure taken out from the movable mold D1 also accompanies 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, but the amount of resin used increases, leaving room for improvement in terms of material costs. .

  On the other hand, when molding the outer cylinder 51, it may be possible to suppress the influence on the outer cylinder 51 due to the filling temperature and filling pressure by selecting the resin to be used, but in this case, the strength such as bending strength and tensile strength 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 thermal 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 resulting from this is reduced. And leave room for improvement.

  In addition, when attempting 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. Leave room for improvement in the cost of spending.

  In contrast, the conventional vibration isolator 50 is provided with a flange 51b at one end in the axial direction of the outer cylinder 51, thereby increasing the rigidity of the entire outer cylinder 51, 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 unit die is reduced, which is disadvantageous for molding for the purpose of obtaining a large number of pieces and leaves room for improvement.

  In addition, the problem that high temperature and high pressure is applied to the outer cylinder 51 does not occur only at the time of molding the blower fan structure, 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.

  In other words, in the conventional technology, 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, and these are suppressed. In doing so, 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 obtaining a large number of pieces. An object of the present invention is to provide a blower fan vibration isolator and a blower fan structure including the same.

  The blower vibration isolator of the present invention is a blower fan vibration isolator having an outer cylinder for holding the blower fan and having an inner cylinder connected to the inner cylinder via an elastic member. Further, a holding area for the blower fan is provided by forming a step over the entire circumference of the outer peripheral surface of the outer cylinder.

  In this invention, it is preferable that the said level | step difference becomes a surface orthogonal to the axial direction of an outer cylinder.

  In addition, in this case, it is preferable that at least one of the end portions of the outer cylinder is a protruding portion that protrudes more than the elastic member.

  Further, another vibration isolator for a blower fan according to the present invention has an outer cylinder for holding the blower fan and has an outer cylinder connected to the inner cylinder via an elastic member inside thereof. It is a tool, Comprising: At least one of the edge parts of the said outer cylinder becomes a protrusion part which protruded rather than the said elastic member, It is characterized by the above-mentioned.

  In any of the present invention, it is preferable that the inner peripheral surface of the projecting portion is an inclined surface that increases in diameter toward the end surface.

  A blower fan structure according to the present invention includes the vibration isolator described above and a blower fan held in the holding region of the outer cylinder of the vibration isolator.

  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 for the blower fan according to the present invention is configured to form a step over the entire circumference of the outer peripheral surface of the outer cylinder of the vibration isolator to provide a holding area for the blower fan. In forming the fan for use, for example, if the region on the large diameter side of the step is used as the region used for the forming, the area of the forming region can be reduced. That is, according to the vibration isolator of the present invention, compared to the conventional case where the blower fan is formed on the entire outer peripheral surface of the outer cylinder, the area that receives the resin pressure during molding (pressure receiving area) can be reduced. The force received by the outer cylinder receiving the resin pressure can be reduced.

  Therefore, according to the vibration isolator which is this invention, the deformation | transformation which arises when high temperature and a high pressure are added to an outer cylinder can be suppressed, without thickening an outer cylinder or providing a flange in an outer cylinder.

  Further, when the blower fan structure having the vibration isolator and the blower fan is integrally formed using the above vibration isolator according to the present invention, deformation of the outer cylinder in the vibration isolator is suppressed. The anti-vibration function is not impaired by deformation or eccentricity of the anti-vibration 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.

  By the way, even if there is no step on the outer peripheral surface of the outer cylinder, if the step is formed in the mold and a cavity is formed between the large diameter side of the step and the outer peripheral surface of the outer cylinder, the outer peripheral surface of the outer cylinder It is also possible to make only a part of the area a holding area for the blower fan.

  However, in this case, a cavity is formed between the large diameter side of the step and the outer peripheral surface of the outer cylinder so that the resin in the cavity does not flow between the small diameter side of the step and the outer peripheral surface of the outer cylinder. For this purpose, the dimensions must be adjusted so that the insert can be inserted with the outer cylinder in close contact or with a very small clearance.

  However, such dimensional adjustment is actually very difficult in consideration of the dimensional accuracy of the mold and the outer cylinder. Moreover, even if the dimensions are adjusted in this way, a smooth insert cannot be realized, so that the work efficiency is poor.

  In addition, if a step is formed in the mold and only a part of the outer peripheral surface of the outer cylinder is used as a holding area for the blower fan, the vibration isolator outer cylinder is inserted into the mold without being aligned. Although it is aligned at the time of insertion, it may return to an unaligned state when taken out as a blower fan structure, and vibration or noise may occur.

  On the other hand, the vibration isolator according to the present invention has a step formed on the outer peripheral surface of the outer cylinder. Therefore, a step is formed in the molding die that is divided into a large diameter side and a small diameter side. By simply contacting the step of the cylinder, a cavity is formed between the large diameter side of the step formed in the mold and the holding area of the outer cylinder, and the resin in this cavity is the small diameter side of the step formed in the mold And a region other than the holding region of the outer cylinder can be sealed so as not to flow.

  That is, when a step is formed on the outer peripheral surface of the outer cylinder as in the case of the vibration isolator according to the present invention, a clearance is provided on the small diameter side of the step formed on the molding die when the outer cylinder is inserted into the molding die. Since it can be inserted even in a state, it is not necessary to insert in a state where the outer cylinder is in close contact or with a very small clearance, and the work efficiency is improved. As a result, this also applies to the blower fan structure of the present invention.

  Further, according to the vibration isolator of the present invention, since the outer cylinder has a step, for example, if the large diameter side of the step is a holding area for the blower fan, the inner cylinder of the vibration isolator is On the other hand, even if the vibration isolator is housed in the mold while the outer cylinder is eccentric or is not maintained in a perfect circle due to deformation or the like, the vibration isolation is formed by the step. The small diameter region of the tool can be inserted with a clearance from the mold. That is, the vibration isolator according to the present invention can be stored without interfering with the mold. For this reason, even if the vibration isolator according to the present invention is preliminarily accompanied by eccentricity or the like, the propeller fan structure is used because the air blower fan is aligned without being affected by the accuracy of the vibration isolator. Even if it is taken out from the mold as a body, the rotational accuracy is not deteriorated and vibrations and noises are not generated.

  Moreover, according to the present invention, various problems exemplified below can be improved together.

  First, according to the vibration isolator of the present invention, it is not necessary to thicken the outer cylinder or provide a flange on the outer cylinder. Therefore, the material cost is improved, the work efficiency is improved, and the manufacturing cost associated therewith is reduced. Improvements can be realized. In addition, as a result, the same applies to the blower fan structure according to the present invention.

  Moreover, according to the vibration isolator which is this invention, since the curvature and sink of the outer cylinder which arise in an outer cylinder with the thickening of an outer cylinder are suppressed, quality stabilization can be aimed at. This is because, in forming the blower fan in the vibration isolator, the influence of warpage and sink marks generated in the outer cylinder of the vibration isolator is not propagated to the blower fan. The quality of the structure is also stabilized.

  Moreover, according to the vibration isolator which is this invention, the yield does not deteriorate by the variation in manufacturing conditions etc. compared with the case where an outer cylinder is thickened or a flange is provided in an outer cylinder. Moreover, since it is not necessary to increase the thickness of the outer cylinder or to provide a flange on the outer cylinder, the inspection associated with increasing the thickness of the outer cylinder, the inspection associated with providing the flange, etc. are not required. Manufacturing management becomes easy. If a blower fan structure is formed using such a vibration isolator, as a result, the yield is not deteriorated due to variations in manufacturing conditions, and inspection items can be reduced, thereby facilitating manufacturing management. .

  In addition, increasing the thickness of the outer cylinder or eliminating the need to provide a flange on the outer cylinder leads to a reduction in the size of the vibration isolator. It is effective for forming for the purpose.

  Furthermore, 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 used for positioning and holding with respect to the mold. Since it can utilize as a site | part, 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 addition, in the vibration isolator according to the present invention, if the inner peripheral surface of the projecting portion is an inclined surface that expands in diameter toward the end surface, when inserted into a mold as an insert part and clamped, Since the inner peripheral surface of the projecting portion functions as a guide surface, smooth fitting with the molding die is possible. For this reason, it is similarly effective in suppressing the deformation of the outer cylinder accompanying the application of high temperature and high pressure to the outer cylinder attached in the mold. For this reason, the fan structure for air blow molded using such a vibration isolator also maintains its vibration isolating function in a better state.

  Note that the configuration in which at least one of the end portions of the outer cylinder is projected from the elastic member is independent of the configuration in which a step is formed over the entire outer peripheral surface of the outer cylinder. It can also be set as the structure which carried out.

  Further, the step according to the present invention can be selected in various shapes, such as a surface inclined along the axial direction of the outer cylinder, a surface orthogonal to the axial direction of the outer cylinder, If the step according to the present invention is a surface perpendicular to the axial direction of the outer cylinder, a region in which a cavity is formed by efficiently transmitting a mold clamping pressure acting on the step when the mold is clamped to the step. And an area where no cavity is formed can be effectively sealed.

  For this reason, in the vibration isolator according to the present invention, if the step of the outer cylinder is a surface orthogonal to the axial direction of the outer cylinder, the blower fan can be reliably formed only in the holding area of the outer cylinder. . 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.

(a) to (c) 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 other vibration isolator 10 It is a perspective view shown from the one end surface. (a), (b) respectively shows the propeller fan structure which is one form of this invention which formed the propeller fan integrally using the vibration isolator of FIG. 1 from the end surface on the large diameter side of the vibration isolator outer cylinder. It is a perspective view and the perspective view shown from the small diameter side end surface 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 propeller fan 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 just before attaching the vibration isolator to a movable mold | type in shape | molding a hub only in a part of conventional vibration isolator outer cylinder. FIG. 6 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. 5. When forming a propeller fan structure using a vibration isolator, it is a schematic diagram which illustrates a resin flow when filling a thermoplastic resin from the gate of a shaping | molding die. (a) to (c) are structural analysis diagrams when high temperature and high pressure are applied to one end of the vibration isolator outer cylinder according to the conventional example 1, respectively, and one end of the vibration isolator outer cylinder according to the conventional example 2. It is a structural analysis figure at the time of applying high temperature and a high pressure, and a structural analysis figure at the time of applying high temperature and a high pressure to the one end part of the vibration isolator outer cylinder according to this invention. (a), (b) is a principal part perspective view which shows the modification of the propeller fan structure which concerns on this invention, respectively. (a), (b) is a perspective view which shows the structure which combined the vibration isolator according to this invention with the centrifugal fan which is another ventilation fan from the air inflow side. It is a principal part perspective view of the propeller fan structure illustrated in order to demonstrate the load added to the fan for ventilation provided with the vibration isolator. Each of (a) to (c) evaluates performance by operating a propeller fan structure equipped with a conventional vibration isolator and a propeller fan structure equipped with a vibration isolator according to the present invention under the same conditions. It is the experimental data obtained to do. (a) and (b) respectively show the sound pressure generated in a wide frequency band (frequency band between 0 and 5 KHz) during operation when the comparative example and the embodiment of the present invention are mounted on an existing air conditioner outdoor unit. This is experimental data for verifying the level (dB). When forming a hub in the whole outer cylinder of the conventional vibration isolator, after attaching the vibration isolator to the movable mold, it is an essential part cross-sectional view showing an enlarged state where the movable mold and the fixed mold are clamped. .

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

  1 (a) to 1 (c) 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.

  Reference numeral 11 denotes an outer cylinder formed by injection molding using a thermoplastic resin. As shown in the figure, the outer cylinder 11 is formed with a step S over the entire outer peripheral surface thereof.

  As shown in FIG. 1B, the step S is a vertical surface (hereinafter referred to as “step surface”) f1 orthogonal to the direction of the axis O, and the outer peripheral surface of the outer cylinder 11 has a large outer diameter. A large-diameter region surface f2 and a small-diameter region surface f3 having a smaller outer diameter than the large-diameter region surface f2 are partitioned.

  The large-diameter region surface f2 is integrally provided with an annular convex portion 11f that protrudes outward over the entire circumference, and a plurality of portions extending along the axis O are provided between the annular convex portion 11f and the step S. Grooves 11g are formed.

  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 and using thermoplastic elastomer, vulcanized rubber or the like as a main raw material.

  In the outer cylinder 11 according to this embodiment, the inner peripheral surface f4 of the outer cylinder 11 is from one end face (hereinafter referred to as “large-diameter side end face”) e1 of the outer cylinder 11 to the other end face (hereinafter referred to as convenience). (Referred to as “small-diameter side end face”) e2 is inclined so as to be reduced in diameter along the axis O, and an annular projecting part 11p projecting toward the axis O is integrally formed in the vicinity of the small-diameter side end face e2. However, the shape of the inner peripheral surface of the outer cylinder 11 is not limited to this, for example, the thickness of the large-diameter side region surface f2 is the same as the thickness of the small-diameter side region surface f3. It may be made to become.

  Further, as shown in FIG. 1 (b), the outer cylinder 11 has projecting portions P whose end portions located on the large diameter side and the small diameter side project from the elastic member 13, respectively. The protruding portion P according to this embodiment is formed by cutting out the outermost peripheral edge portion of the end face of the elastic member 13 in an annular shape around the axis O.

  Further, as shown in the figure, the inner peripheral surface f5 of the projecting portion P located on the large-diameter side is an inclined surface that increases in diameter toward the large-diameter end surface e1. Similarly, the inner peripheral surface f5 of the protruding portion P located on the small diameter side is also an inclined surface that increases in diameter toward the small diameter side end surface e2, as shown in FIG.

  FIGS. 2 (a) and 2 (b) respectively show the vibration isolation of the propeller fan structure 1 according to one embodiment of the present invention, in which a propeller fan (axial fan) 20 is integrally formed using the vibration isolator 10 of FIG. FIG. 3 is a perspective view shown from the large-diameter side end surface e1 of the instrument outer cylinder 11 and a perspective view shown from the small-diameter side end face e2 of the vibration isolator outer cylinder 11.

  The propeller fan 20 is integrally connected to an inner cylinder portion (hereinafter referred to as “hub”) 21 fixedly held on the large-diameter side region surface f2 of the vibration isolator outer cylinder 11 and the hub 21 via a partition wall 22. An outer cylinder part 23 and a plurality of blades 24 connected integrally with the outer cylinder part 23 are provided around the outer cylinder part 23.

  Here, FIGS. 3 and 4 are enlarged cross-sectional views showing a main part immediately before the vibration isolator 10 is attached to the movable mold D1 in forming the propeller fan structure 1, and then the movable mold D1. FIG. 4 is an enlarged cross-sectional view of a main part showing a state where a fixed mold D2 is clamped.

  Reference sign D1 is a movable type. The movable die D1 has a recess D for holding the vibration isolator 10. The recess D includes a deepest surface F1 against which the small diameter side end surface e2 of the vibration isolator outer cylinder 11 abuts, a first inner peripheral surface F2 surrounding the small diameter side region surface f3 of the vibration isolator outer cylinder 11, and the first inner periphery. The surface F2 and the step surface F3 are connected to form a second inner peripheral surface F4 having a larger diameter than the first inner peripheral surface F2, and the fitting hole 10a of the vibration isolator 10 penetrates through the deepest surface F1. The shaft portion Ds is integrally formed.

  Further, the step surface F3 is a surface orthogonal to the direction of the axis O, and as shown in FIG. 4, the step surface of the vibration isolator outer cylinder 11 with the movable mold D1 and the fixed mold D2 clamped. Makes surface contact with f1. Further, as shown in the figure, the second inner peripheral surface F4 forms part of the cavity C4 together with the large-diameter side region surface f2 of the vibration isolator outer cylinder 11, and this cavity is the hub 21 of the propeller fan 20. It becomes a cavity for forming a part of.

  Reference sign D2 is a fixed type. As shown in FIG. 4, the fixed die D <b> 2, in the clamping state with the movable die D <b> 1, forms a remaining portion of the cavity C <b> 4 together with the mating surface F <b> 5 of the movable die D <b> 1. It becomes a cavity for forming the remaining part and the partition wall 22.

  In addition, the mating surface F6 of the fixed die D2 is integrally provided with a protrusion Dr that is in surface contact with the inner peripheral surface f5 of the vibration isolator projecting portion P in the clamping state with the movable die D1, as shown in FIG. Is formed.

  Although omitted in FIGS. 3 and 4, not only the cavity C4 for forming the hub 21 and the partition wall 22 but also the outer cylinder portion 23 and the blades 24 are provided between the movable die D1 and the fixed die D2. A cavity for molding is also formed.

  That is, in forming the propeller fan structure 1 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, 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 positioned and held with the protrusion Dr of the fixed mold D2 as a guide. After clamping the movable mold D1 and the fixed mold D2, the thermoplastic resin is pumped from the gate G of the fixed mold D2, and this thermoplastic resin is in the cavity formed between the movable mold D1 and the fixed mold D2. Filled.

  At this time, the step surface F3 of the movable mold D1 and the step surface f1 of the vibration isolator outer cylinder 11 are in surface contact by clamping the movable mold D1 and the fixed mold D2, so that the thermoplastic resin is vibration-proof. Only the space (cavity C4) existing on the large-diameter side region surface f2 side of the tool outer cylinder 11 is filled.

  In short, according to the vibration isolator 10 according to the present invention, the step S is formed over the entire circumference of the outer peripheral surface of the vibration isolator outer cylinder 11, and the large-diameter region surface f2 of the step S is held by the propeller fan 20. By forming the region, when the propeller fan 20 is formed on the vibration isolator outer cylinder 11, the area of the region used for forming can be reduced. That is, according to the vibration isolator 10 of the present embodiment, the pressure receiving area can be reduced as compared with the conventional case in which the propeller fan 20 is formed on the entire outer peripheral surface of the vibration isolator outer cylinder 11. The force received by 11 receiving the resin pressure can be reduced.

  Therefore, according to the vibration isolator 10 of the present 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.

  Further, when the propeller fan structure 1 is molded using the vibration isolator 10, the vibration isolator 10 is deformed or decentered by suppressing the deformation of the vibration isolator outer cylinder 11. The anti-vibration function is not impaired. Therefore, according to the propeller fan structure 1, the vibration isolator outer cylinder 11 can be made thicker 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 use only a part of the vibration isolator outer cylinder 51 as a holding area for the propeller fan 20 using the conventional vibration isolator 50, and FIGS. When forming the hub 21 on only a part of the tool outer cylinder 51, an enlarged cross-sectional view showing the main part immediately before the vibration isolator 50 is attached to the movable mold D1, and then the movable mold D1 and the fixed mold D2. It is principal part sectional drawing which expands and shows the state which clamped.

  In this case, the relationship between the outer peripheral surface of the peripheral wall 51a of the vibration isolator outer cylinder 51 and the first inner peripheral surface F2 of the movable mold D1 needs to be in contact with or close to each other so that the resin does not flow in. The clearance needs to be maintained with an accuracy of about 0.1 mm or less in order to prevent the flow of resin with a high filling pressure (arrow m in FIG. 6).

  However, the outer diameter accuracy of the vibration isolator 51 is managed and manufactured in advance so as to minimize the dimensional error in the manufacturing stage, but there is a limit to the management and manufacturing in such a manufacturing stage. For example, dimensional errors may occur in the manufacturing process of the outer cylinder 51 and the inner cylinder 52 (cutting, die casting, drawing, resin injection molding, etc.), and the outer cylinder 51 and the inner cylinder 52 are connected. That occur during the manufacturing process of the elastic member 53 (rubber vulcanization molding, injection molding using a thermoplastic elastomer, etc.), and dimensional errors are accumulated respectively.

  That is, when the structure is a laminated structure composed of an outer cylinder, an elastic member, and an inner cylinder, as in the case of the vibration isolator according to the present invention, it is difficult to avoid in manufacturing with accuracy such as concentricity and roundness. In particular, due to the influence of manufacturing capacity during mass production, the outer diameter of the outer cylinder may be eccentric by about 0.3 mm with respect to the shaft center.

  In such a case, as shown in FIGS. 5 and 6, when the vibration isolator 30 is inserted, the outer peripheral surface 51a of the vibration isolator outer cylinder 51 interferes with the inner surface (first inner peripheral surface F2) of the movable die D1. If the outer cylinder 51 is inserted while being pressed in the direction of the axis O, and the vibration isolator outer cylinder 51 is deformed even a little, the smooth insert is hindered and the work efficiency is lowered.

  Moreover, when the step F3 is formed in the movable die D1 and only a part of the outer peripheral surface of the conventional vibration isolator outer cylinder 51 is used as the holding area of the propeller fan 20, the vibration isolator 50 can be inserted even if the vibration isolator 50 can be inserted. The alignment of the tool outer cylinder 51 is only temporary due to the elastic deformation of the elastic member 53. For this reason, when the formation of the propeller fan 20 is completed and taken out from the molds D1, D2, the vibration isolator outer cylinder 51 returns to the state before the insertion with poor accuracy due to the restoring force of the elastic member 53.

  For this reason, the propeller fan structure thus obtained is reliably influenced by the vibration isolator outer cylinder 51, and the rotational accuracy (vibration, balance) is deteriorated. Noise may be generated.

  On the other hand, since the vibration isolator 10 of this embodiment has a step S formed on the outer peripheral surface of the vibration isolator outer cylinder 11, a step surface F3 that divides the movable die D1 into a large diameter side and a small diameter side is provided. The second inner peripheral surface F4 formed on the movable die D1 and the holding region surface f2 of the vibration isolator outer cylinder 11 are formed by simply contacting the step surface f1 of the vibration isolator outer cylinder 11 with the step surface F3. A seal is formed so that the resin in this cavity does not flow between the first inner peripheral surface F2 formed on the movable mold D1 and the small-diameter side region surface f3 of the vibration isolator outer cylinder 11. can do.

  That is, according to the vibration isolator of this embodiment, as shown in FIG. 4, a clearance (between the first inner peripheral surface F2 of the movable die D1 and the small-diameter side region surface f3 of the vibration isolator outer cylinder 11 is provided. For example, C can be provided.

  Thus, if the clearance C is provided between the first inner peripheral surface F2 of the movable die D1 and the small-diameter side region surface f3 of the vibration isolator outer cylinder 11, the vibration isolator 10 is accompanied by eccentricity. However, since the vibration isolator 10 can be stored in the movable type D1 without interfering with the movable type D1, the work efficiency is also improved.

  Further, according to the vibration isolator 10 of the present embodiment, since the step S is formed in the outer cylinder 11, for example, if the large diameter side of the step is a holding area for the blower fan, Even if the vibration isolator 10 is housed in the movable mold D1 while the outer cylinder 11 is eccentric with respect to the cylinder 13 or the outer cylinder 11 itself cannot be maintained in a perfect circle due to deformation or the like, The formed small diameter side region surface f3 can be inserted with a clearance C with respect to the movable die D1. That is, the vibration isolator 10 according to the present invention can be stored without interfering with the movable mold D1. For this reason, even when the vibration isolator 10 according to the present invention is preliminarily accompanied by eccentricity or the like, the propeller fan 20 is aligned without being influenced by the accuracy of the vibration isolator 10 when the propeller fan 20 is molded. For this reason, even if the propeller fan structure 1 is taken out from the molds D1 and D2, the rotation accuracy is not deteriorated and vibrations and noises are not generated.

  Therefore, the rotational accuracy of the propeller fan structure 1 molded using the vibration isolator 10 is stable regardless of the accuracy of the accuracy contained in the vibration isolator 10.

  Furthermore, in the vibration isolator 10 of the present embodiment, the large diameter side end of the vibration isolator outer cylinder 11 is a projecting portion P projecting from the elastic member 13, so that the projecting portion P is positioned with respect to the fixed mold D2. Therefore, it is possible to more effectively suppress deformation caused by high temperature and high pressure applied to the vibration isolator outer cylinder 11. For this reason, the propeller fan structure 1 molded using the vibration isolator 10 is maintained in a state in which the vibration isolating function is better.

  In the case of this embodiment, the small diameter side region surface f3 of the outer cylinder 11 is not filled with the thermoplastic resin, and therefore the protrusion Dr is not provided on the movable mold D1, but if the protrusion Dr is provided on the movable mold D1, The protruding portion P provided at the small diameter side end can be used as a positioning and holding portion for fixing to the movable mold D1. This is effective when the small-diameter side area surface f3 is used as a holding area for the propeller fan 20.

  That is, the protruding portion P according to the present invention may be formed in at least one of the small diameter side end and the large diameter side end. Further, the protruding portion P can be configured independently of the configuration in which the step S is formed in the outer cylinder 51.

  In addition, in the vibration isolator 10, since the inner peripheral surface f5 of the projecting portion P is an inclined surface that increases in diameter toward the end surface e1, when inserting into the movable mold D1 as an insert part and clamping the mold, Since the inner peripheral surface f5 of the projecting portion P functions as a guide surface, interference with the fixed mold D2 when attaching to the fixed mold D2 is suppressed as much as possible, and a smooth fitting with the fixed mold D2 is achieved. It becomes possible. For this reason, the anti-vibration device outer cylinder 11 attached in the molds D1 and D2 is similarly effective in suppressing deformation of the anti-vibration device outer cylinder 11 due to the application of high temperature and high pressure. For this reason, the propeller fan structure 1 molded using the vibration isolator 10 is also maintained in a better state.

  According to the present invention, even when the protrusion D is provided on the movable die D1, the inner peripheral surface f5 of the protruding portion P provided at the small-diameter side end portion is similarly inclined, so that the vibration isolator outer cylinder When 11 is inserted into the movable mold D1 and attached to the movable mold D1, the interference with the movable mold D1 is suppressed as much as possible, and a smooth fitting with the movable mold D1 becomes possible. In addition, according to such a configuration, even when the small-diameter side region surface f3 is used as a holding region of the propeller fan 20, high temperature and high pressure are applied to the vibration isolator outer cylinder 11 attached in the molds D1 and D2. Therefore, the propeller fan structure 1 in this case is also maintained in a better state.

  Incidentally, the step S according to the present invention is a surface that is inclined along the axis O direction of the vibration isolator outer cylinder 11 or a surface that is orthogonal to the axis O direction of the vibration isolator outer cylinder 11. However, since the step surface f1 of the step S according to the present embodiment is a surface orthogonal to the direction of the axis O of the vibration isolator outer cylinder 11, the shape of the step S when the mold is clamped can be selected. The mold clamping pressure acting on the step surface f1 is efficiently transmitted to the step surface f1, so that the space between the large-diameter side region surface f2 where the cavity is formed and the small-diameter side region surface f3 where the cavity is not formed is efficiently obtained. Can be sealed.

  For this reason, in the vibration isolator 10 of the present embodiment, the step surface f1 of the vibration isolator outer cylinder 11 is a surface orthogonal to the axis O direction of the vibration isolator outer cylinder 11, The hub 21 of the propeller fan 20 can be reliably molded only in the holding region. For this reason, the propeller fan structure 1 molded using the vibration isolator 10 is maintained in a state in which the vibration isolating function is better.

  By the way, in forming the blower fan, it is important to select the position of the gate G formed on the fixed mold D2 in order to stabilize production efficiency and quality. For example, in the propeller fan 20 shown in FIG. 7, in order to supply the resin in a balanced manner until the tip of each blade 24 together with the hub 21, the position of the gate G is set to a suitable position between the hub 21 and the blade 24. .

  However, since the flow direction from the gate G spreads radially around the gate G as shown by the arrow in the figure, the filling pressure applied to the outer peripheral surface of the vibration isolator outer cylinder 11 is also reduced. It is not uniform with respect to the outer peripheral surface of the resin, and is slightly different according to the flow direction of the thermoplastic resin.

  Moreover, the temperature of the thermoplastic resin from the gate G is relatively high, for example, 200 to 300 C °, and the pressure is as high as about 200 to 400 kg / cm 2. It may be deformed.

  Further, FIGS. 8 (a) to 8 (c) show the external force against the pressure received by the outer cylinder of the vibration isolator when the vibration isolator is inserted into the propeller fan mold and the thermoplastic resin is injection molded. This is an example in which the degree of deformation of the cylinder is subjected to structural analysis (stress deformation analysis) for each form of the outer cylinder.

  For example, in Conventional Example 1 shown in the structural analysis diagram of FIG. 8 (a), the vibration isolator outer cylinder is a straight cylinder, and when a hub is formed on one end of the outer cylinder, as shown in FIG. In addition, the opposite end (end face e2 side) is also greatly deformed. On the other hand, the conventional example 2 shown in the structural analysis diagram of FIG. 8 (b) is a conventional vibration isolator 50 having a vibration isolator outer cylinder provided with a flange 51b, and a hub is formed on the flange 51b side. Although the deformation at the opposite end (end face e2 side) can be suppressed small, the displacement is still large as shown in FIG.

  On the other hand, as shown in the structural analysis diagram of FIG. 8 (c), the vibration isolator outer cylinder 11 according to the present invention has a small diameter as shown in the figure even if a hub is formed on the large-diameter side region surface f2. Almost no deformation occurs on the side region surface f3.

  FIGS. 9 (a) and 9 (b) are perspective views showing a main part of a modified example of the propeller fan structure 1 according to the present invention.

  In the form shown in FIG. 9 (a), a plurality of fins 25 formed integrally with the partition wall 22 connects the hub 21 and the outer cylinder portion 23 radially. In this case, the attachment strength of the vibration isolator 10 to the propeller fan 20 can be further increased.

  In the form shown in FIG. 9 (b), a part of the large-diameter region surface f2 of the vibration isolator outer cylinder 11 is held by the hub 21 while the remaining portion of the large-diameter region surface f2 is held by the fins 25. is there. In this case, when the propeller fan structure 1 is molded, the resin pressure applied to the large-diameter side region surface f2 can be further reduced. Further, along with the reduction of the resin pressure, the vibration isolator outer cylinder 11 can be thinned.

  Further, in the case of this embodiment, as shown in the figure, the fin 25 is configured to fit into a groove 11g formed in the large-diameter side region surface f2 of the vibration isolator outer cylinder 11. In this case, the holding by the fins 25 becomes strong. In addition, in the present embodiment, the tip of the fin 25 is “present”, and the groove 11g is a “present groove” in which “there” is fitted, or by the reverse configuration, the fin 25 However, the groove 11g may be a simple groove.

  Further, in this embodiment, the vibration isolator outer cylinder 11 is held by a combination of the hub 21 and the fins 25, but may be held only by the fins 25. Furthermore, the fins 25 may be directly joined to the large diameter side region surface f2 without forming the grooves 11g on the large diameter side region surface f2.

  FIGS. 10 (a) and 10 (b) are perspective views showing a structure in which the vibration isolator 10 is combined with a centrifugal fan, which is another blower fan, from the air inflow side.

  The centrifugal fan shown in FIG. 10 (a) is a so-called turbo fan 30, a support plate 32 having a hub 31 that holds the large-diameter side region surface f2 of the vibration isolator outer cylinder 11, and the support plate 32 and the axis line. And a shroud 33 arranged at intervals in the direction, and a plurality of blades 34 are connected therebetween. The centrifugal fan shown in FIG. 10 (b) is a so-called sirocco fan 40, a disk member 42 having a hub 41 that holds the large-diameter side region surface f2 of the vibration isolator outer cylinder 11, and the disk member 42. On the other hand, a plurality of blades 43 are connected around the axis while being regulated by the ring member 44.

  The above is the preferred embodiment of the present invention, but various modifications can be made within the scope of the claims by those skilled in the art. For example, the arrangement ratio of the step with respect to the entire length of the outer cylinder can be changed as appropriate according to the performance and usage conditions required for the blower fan, and the shape of the blower fan, the number of blades, and the like can be changed as appropriate. be able to. Moreover, according to this invention, the member of each form mentioned above, its form, its peripheral structure, etc. can be used in combination according to a use, respectively.

  For example, as shown in FIG. 11, the vibration isolator of the fan structure for blower includes rotational torque from the motor shaft Ms connected to the motor M, weight of the fan (self-weight), centrifugal force generated by the rotation, and practical use for this. Since the heat history etc. are added, if the conventional vibration isolator 10 and its holding method are changed by reducing the holding area of the blower fan as in the present invention, a new practical problem (load It is necessary to confirm that there is no vibration, noise, etc. generated by deformation due to thermal history or the like, that is, that at least the conventional performance is maintained.

  Therefore, in order to evaluate the performance of the blower fan structure according to the present invention, the present inventor uses a propeller fan structure including the vibration isolator 10 according to the present invention as an example, while the conventional vibration isolator 50 is used. The provided propeller fan structure was used as a comparative example, and each was operated under the same conditions, and test data shown in FIG. 12 was obtained.

  In addition, the comparison of both uses the same performance as the motor, unifies the motor rotation speed to 1000rpm in the environment of the temperature of 80 ° C, repeats the stop for 2 minutes after the rotation for 2 minutes, and operates for 200 hours. went.

  In addition, “Eccentric center of gravity distance (μm)” in FIG. 12 (a) is the change in the center of gravity of the change in the unbalance amount before and after the test of the propeller fan structure 1 with respect to the axis O (before the test and after 200 hours of operation). It is expressed by replacing the distance, and further, `` surface runout (mm) '' in FIG. 11B and `` core runout (mm) '' in FIG. 11C are the positions indicated by arrows in FIG. 3 shows the amount of displacement generated on the outer peripheral surface of the propeller fan outer cylinder portion 23 before and after the test (before the test and after 200 hours of operation). These are important factors that influence the performance of the propeller fan structure.

  As is clear from the respective experimental data shown in FIGS. 12 (a) to (c), the examples maintain the same or better performance than the comparative examples in each evaluation item, and the stress and heat are increased with the operation. Even if it received the history, it was confirmed that it was a level that would not cause any trouble as a propeller fan structure in practice.

  Further, FIGS. 13 (a) and 13 (b) show the sound generated in a wide frequency band (frequency band between 0 to 5 KHz) during operation when the comparative example and the example are mounted on an existing air conditioner outdoor unit, respectively. It is the experimental data which compared and verified the pressure level (dB).

  In this verification, each propeller fan structure is attached to an air conditioner outdoor unit equipped with a DC brushless motor and operated at a rotational speed of 1000 rpm, and measurement is performed at a position 1 m ahead of the air conditioner outdoor unit in accordance with “JIS C 9612”. It was.

  As is clear from a comparison of FIGS. 13 (a) and 13 (b), it was confirmed that the embodiment did not have a particularly prominent increase in sound pressure level in a wide frequency band compared to the comparative example. Also, the noise value of the comparative example is 40.9 dB (A), whereas the noise value of the example is 39.1 dB (A), which is equal to or lower than that of the comparative example. It was confirmed.

  The vibration isolator according to the present invention is not limited to an axial flow fan or a centrifugal fan, but is also 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. Can do.

Propeller fan structure (fan structure for ventilation)
10 Anti-vibration device (Invention anti-vibration device)
10a Shaft fitting hole
11 outer cylinder
11f Annular projection
11g groove
11p protrusion
11r rib
12 inner cylinder
13 Elastic member
20 Propeller fan (fan for ventilation according to the present invention)
21 Hub
22 Bulkhead
23 Propeller fan outer cylinder
24 feathers
25 fins
30 Turbo fan (fan for blowing according to the present invention)
31 Hub
32 Support plate
33 Shroud
34 feathers
40 Sirocco fan (fan for ventilation according to the present invention)
41 Hub
42 Disc members
43 feathers
50 Vibration isolator (conventional vibration isolator)
51 outer cylinder
51a Perimeter wall
51b flange
52 inner cylinder
53 Elastic member D Movable mold side recess
D1 Movable type
D2 fixed type
e1 Large-diameter axial end face
e2 Small diameter side axial end face
f1 Stepped surface around the outer cylinder
f2 Large-diameter area on the outer periphery of the outer cylinder
f3 Small-diameter area on the outer periphery of the outer cylinder
f4 Inner peripheral surface of outer cylinder
f5 Inner circumferential surface of cylindrical part
F1 Step surface
F2 Concave first inner peripheral surface
F3 Recessed step surface
F4 Concave second inner peripheral surface
F5 Movable side mating surface
F6 Fixed mold side mating surface P Projection part S Step difference O Axis (axial center)
M motor
Ms Motor shaft

Claims (2)

A vibration isolator as an insert product in which an outer cylinder and an inner cylinder made of a thermoplastic resin are connected by an elastic member, and a blower fan vibration isolator in which a blower fan is injection-molded in the outer cylinder.
A step is formed over the entire circumference of the outer peripheral surface of the outer cylinder, and the large-diameter region surface among the small-diameter region surface and the large-diameter region surface divided by the step is held by the blower fan. Area and
At least one of the end portions of the outer cylinder is a protruding portion that protrudes beyond the elastic member.   A blower fan structure comprising the vibration isolator according to claim 1 and a blower fan held in the holding region of an outer cylinder of the vibration isolator.

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