JP2018066329A - Air-conditioning fan and air conditioner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning fan capable of simply and inexpensively separating a metal boss from a fan boss in a short time, and improving recyclability, and an air conditioner using the air-conditioning fan.SOLUTION: An air-conditioning fan comprises: a plurality of resin blades, a resin fan boss on an outer peripheral side of which the plurality of resin blades is arranged; and a metal boss whose outer periphery is fitted into an inner periphery of the resin fan boss, and inner periphery is fitted into a shaft. An outer peripheral surface of the metal boss is a tapered surface expanding from an upper side toward a lower side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning fan excellent in recyclability, and also relates to an air conditioner using the same.

  The air-conditioning fan mounted on the air conditioner is often made of resin, and the motor shaft that rotates the fan is often made of metal. For this reason, the resin air conditioning fan is often configured to rotate by receiving the driving force of the motor through the contact portion with the metal shaft.

  As a structure for efficiently transmitting the driving force of the motor to the fan, the tip of the metal shaft is formed in a D shape when viewed from the radial cross section of the shaft, and the shaft insertion hole of the resin fan is also formed in the same D shape. The configuration is known (for example, paragraph 0052 of Patent Document 1, FIG. 3, FIG. 6, etc.).

  However, when the fan of Patent Document 1 is operated for a long period of time, the resin deteriorates due to secular change, and the D-shaped corner of the shaft bites into the D-shaped corner of the resin fastening portion. Another problem is that the fan cannot be removed from the shaft.

  In addition, in the case of a motor with a large electromagnetic excitation force (vibration in the rotational direction) such as an AC motor, the vibration scrapes off the D-shape of the resin fan, and eventually the motor drive force cannot be transmitted, The problem of falling off the shaft is also considered.

  In order to prevent these problems, there is a method in which a metal boss having a D-shaped shaft insertion hole is inserted into a shaft fastening portion of a resin fan, and a driving force is transmitted between the shaft and the metal boss. If it is this structure, since both are metals, the said problem does not arise.

  An outline of a conventional air-conditioning propeller fan using a metal boss will be described with reference to FIGS.

  As shown in FIG. 3, a conventional propeller fan 101 includes a substantially cylindrical fan boss 102 having a plurality of blades 103 arranged on a side surface, and a substantially circular tubular metal boss 301 disposed at the center of the fan boss 102. The propeller fan 101 rotates in the direction of the arrow by transmitting the rotational driving force from the motor shaft 104 described later to the fan boss 102 via the metal boss 301, and in the direction of the arrow 111 from the bottom to the top. Wind is generated.

  Next, the structure of the propeller fan 101 will be described in more detail with reference to FIGS. FIG. 5 is a plan view of the fan boss 102 and the metal boss 301 of the propeller fan 101 as viewed from below. Inside the fan boss 102, there are a resin boss 201 integrally formed with the metal boss 103 and a resin boss 201. Radial resin ribs 202 are arranged. 4 is a cross-sectional view of the propeller fan 101 fastened to the motor shaft 104 taken along a plane indicated by a dotted line CD in FIG. 5, and the propeller fan 101 regulates the movement of the propeller fan 101 on the motor shaft 104. A state in which the washer 106 and the nut 107 for fixing the washer 106 are used to fasten the motor shaft 104 is shown.

  As shown in these drawings, by integrally molding the metal boss 301 and the fan boss 102, a rotational driving force from a motor (not shown) is reliably transmitted to the fan boss 102 via the metal boss 301, and the cross section D described above is obtained. The problem of using a metal shaft of a mold can be solved. As a method for fixing the metal boss 301 and the fan boss 102, the metal boss 301 is set in a mold before the propeller 101 is injection-molded, and the molten resin is poured into the mold and then cooled to cool the metal boss 301. There is a method for manufacturing a propeller fan 101 integrally molded with a boss.

JP2013-136972A

  From the viewpoint of recycling, it is necessary to separate the resin and the metal when the air conditioner is discarded or when a defective product of the fan is discarded. However, in the propeller fan 101 shown in FIGS. 3 to 5, since the metal boss 301 and the fan boss 102 are integrally molded, in order to separate them, the fan boss 102 is destroyed with some tool or device. After the metal boss 301 is separated or the resin is melted by heating, it is necessary to separate the metal boss 301. In any case, there is a problem that it takes time and cost and is dangerous for the operator.

  Accordingly, the present invention provides an air conditioning fan that can easily and inexpensively separate a metal boss from a fan boss and has improved recyclability, and an air conditioner using the air conditioning fan. With the goal.

  In order to solve the above problems, in the present invention, a plurality of resin blades, a resin fan boss in which the plurality of resin blades are arranged on the outer peripheral side, and an outer periphery on the inner periphery of the resin fan boss An air conditioning fan configured to be fitted and a metal boss whose inner periphery is fitted to the shaft, and the outer peripheral surface of the metal boss is a tapered surface extending from the upper side to the lower side. A fan was used. A resin boss comprising a metal boss for fastening a shaft with a motor on the fan boss, arranged by arranging a plurality of blades in the circumferential direction of the fan boss, and a resin fan having a rotation center at the center of the metal boss, The metal boss has a structure that fits into the fan boss, and the contact surface of the fan boss and the metal boss is inclined with respect to the shaft axis (tapered surface).

  According to the present invention, it is possible to provide an air conditioning fan that can easily and inexpensively separate a metal boss from a fan boss and improve recyclability, and an air conditioner using the air conditioning fan. Can do.

Sectional drawing of the propeller fan of Example 1 The top view which looked at the propeller fan of Example 1 from the lower side (upstream side) A perspective view of a conventional propeller fan Cross section of a conventional propeller fan Plan view of a conventional propeller fan viewed from below Structural diagram of outdoor unit of top blow type air conditioner Top view without the shroud of FIG. Propeller fan to which the fitting type metal boss of Example 2 is applied A turbofan to which the fitting-type metal boss of Example 3 is applied Structural diagram of the indoor unit of the air conditioner of Example 3

  Hereinafter, an air conditioning fan of the present invention and an air conditioner using the same will be described with reference to the drawings. In addition, below, the duplication description is abbreviate | omitted about the point which is common in the conventional propeller fan 101 demonstrated in FIGS.

  First, the outline | summary of the air conditioner of a present Example is demonstrated using FIG. 6, FIG.

  FIG. 6 shows a structural diagram of the outdoor unit of the top-blowing type air conditioner, and FIG. 7 shows a top view of the outdoor unit with the shroud removed. As shown in these drawings, an outdoor unit 401 of a top-blowing type air conditioner includes a compressor 404, an electric box 405, a heat exchanger 406, a motor between a lower base 402 and an upper shroud 403. A clamp 407, a motor 408, and a propeller fan 100 are provided. Specifically, components such as the compressor 404 are disposed on the bottom base 402, and an electric box is disposed above the components such as the compressor 404. 405 and a blower composed of a propeller fan 100 and a motor 408 are disposed, and a heat exchanger 406 is disposed so as to surround the components as viewed from above.

  Next, a propeller fan 100 which is an air conditioning fan according to the present embodiment will be described with reference to FIGS. FIG. 1 shows a cross-sectional view of a propeller fan 100 to which a fitting-type metal boss 105 is applied, and FIG. 2 shows a plan view of the propeller fan 100 viewed from the lower side (upstream side). 1 is a cross-sectional view of the propeller fan 100 fastened to the motor shaft 104 taken along a plane indicated by a dotted line AB in FIG.

  As shown in FIG. 1, in the propeller fan 100 of the present embodiment, a metal boss 105 used for fastening with the motor shaft 104 is arranged inside the resin boss 201. In the conventional propeller fan 101, the resin boss 201 and the metal boss 301 are integrated by injection molding. However, the propeller fan 100 of this embodiment is mounted on the metal boss 105 after the fan boss 102 is molded. It is a structure that fits in and can be easily separated.

  Here, a method of fitting the metal boss 105 into the fan boss 102 will be described in detail. As is clear from the cross-sectional view of FIG. 1, the outer peripheral surface of the metal boss 105 becomes wider from the top to the bottom. Further, the inner peripheral surface of the fan boss 102 is also widened from the upper side to the lower side. As a result, the contact surface 108 on which the fan boss 102 and the metal boss 105 come into contact is configured with a tapered surface inclined with respect to the axis of the motor shaft 104, and the fan boss 102 and the metal boss 105 are fitted by the own weight of the fan boss 102 itself. By matching, both will be integrated. In this embodiment, since the fan boss 102 and the metal boss 105 are integrated by such a method, when the propeller fan 100 is discarded, the metal boss 105 is pushed from the fan boss upper surface 109 side or the fan boss lower surface 110 side. The fan boss 102 and the metal boss 105 can be easily separated by simply pulling from the fan boss 102.

  By the way, the metal boss 105 has a role of transmitting the driving force of the motor to the propeller fan 100. In the present embodiment, as in Patent Document 1, the transmission of the driving force from the motor shaft 104 to the metal boss 105 is realized by making each radial cross section D-shaped.

  On the other hand, the transmission of the driving force from the metal boss 105 to the fan boss 102 is realized by the conventional propeller fan 101 by integrating the fan boss 102 and the metal boss 301 at the time of injection molding. However, in the propeller fan 100 according to the present embodiment, the metal boss 105 is not fixed to the fan boss 102 and is transmitted by a frictional force therebetween. This frictional force is substantially proportional to the weight of the fan boss 102 to which the blade 103 is attached and the reaction force that blows out the wind (opposite to the blowing direction 111). If the frictional force determined by these is sufficient, the contact surface 108 between the metal boss 105 and the fan boss 102 may be conical.

  However, when the frictional force is insufficient, it is desirable that the radial cross section of the contact surface 108 is substantially polygonal so that it does not slip in the rotational direction. An example is shown in FIG. In FIG. 2, the cross section in the radial direction is substantially square, that is, the corners of the square are rounded. With this shape, no slip occurs on the contact surface 108 between the metal boss 105 and the fan boss 102, so that the driving force of the motor can be reliably transmitted to the fan boss 102 via the metal boss 105. Although the metal boss 105 in FIG. 2 has rounded corners, the driving force can be transmitted even when the corners are rounded. However, it may be difficult to separate the metal boss from the fan boss when the corner bites into the fan boss 102 due to secular change or the like. In that case, if the corners are rounded, there is no worry. Therefore, it is desirable to keep the corners round.

  Further, if the fan boss 102 and the metal boss 105 are simply fitted, the following problem arises. However, the following effects can be obtained by making the contact surface 108 of both the sides into a tapered surface as shown in FIG. .

  Since the fan boss 102 is made of resin, the fan boss 102 expands and contracts greatly as the temperature changes compared to the metal boss 105. For an outdoor unit of an air conditioner, for example, there is a temperature change from a winter outdoor temperature minus 20 degrees to a summer cooling operation temperature of 60 degrees. In the case of the conventional metal boss 301, since it is fixed to the fan boss, it only expands and contracts on the basis of the metal boss, so there is no problem in the amount of expansion / contraction. On the other hand, in the case of the metal boss 105 fitted into the fan boss 102, when the temperature is low and the resin shrinks, a gap is generated between the fan boss 102 and the metal boss 105, the metal boss 105 is idled, and the driving force of the motor is increased. There is a possibility that a problem that the boss 102 cannot be transmitted occurs.

  In response to this problem, the metal boss 105 of the propeller fan of the present embodiment deals with the following. That is, when a gap is formed between the fan boss 102 and the metal boss 105, the fan boss 102 moves downward along the contact surface 108 by its own weight, so that the gap between the two is eliminated. In addition, since the radial direction area on the fan boss lower surface 110 side is configured to be larger than the fan boss upper surface 109 side, the fan boss 102 does not come out even if it moves downward, thereby preventing idle rotation. The driving force of the motor can be reliably transmitted to the fan boss 102.

  Further, as shown in FIG. 1, the length of the metal boss 105 in the rotation axis direction is made longer than the fan boss 102 so as to protrude from the fan boss upper surface 109 and the fan boss lower surface 110, thereby changing the temperature. Therefore, even if the resin expands and contracts, the fan boss upper surface 109 and the fan boss lower surface 110 can be prevented from jumping up and down the metal boss 105, and the area of the contact surface 108 can be kept substantially constant. Therefore, even when the conical metal boss 105 is used, the frictional force on the contact surface 108 does not change, and the driving force of the motor can be reliably transmitted to the fan boss 102.

  Although not shown, the axial cross-sectional shape of the contact surface 108 between the fan boss 102 and the metal boss 105 is not limited to a linear shape, and may be a curved shape.

  According to the configuration of the present embodiment described above, the metal boss can be easily and inexpensively separated from the fan boss in a short time, and the air-conditioning fan with improved recyclability and the air-conditioning fan are used. An air conditioner can be provided.

  Next, a propeller fan 100 to which a fitting type metal boss is applied, which is an air conditioning fan of the second embodiment, will be described with reference to FIG. In addition, duplication description is abbreviate | omitted about the point which is common in Example 1. FIG.

  The propeller fan 100 of the present embodiment shown in FIG. 8 is obtained by adding a protrusion 503 in which a part of the motor side end surface protrudes in the radial direction to the metal boss 105 of the first embodiment. Further, the diameter of the washer 106 is larger than that of the first embodiment. In this way, by providing the washer 106 and the protruding portion 503 that overlap the fan boss 102 in the radial direction above and below the fan boss 102, both have a function as a stopper.

  As described in the first embodiment, the resin has a larger expansion and contraction due to the ambient temperature than the metal. As a result, a radial gap is formed between the metal boss 105 and the fan may move downward. For example, when the resin expands, the fan boss 102 having a reduced diameter moves upward. If the upper stopper is not provided as in the first embodiment, when an unexpected temperature rise occurs, the fan boss 102 that has moved upward falls off the metal boss 105, and this is the surrounding component. For example, when it comes into contact with the heat exchanger, the heat exchanger may be broken and the refrigerant may leak.

  On the other hand, in the configuration of the present embodiment, the fan boss 102 can be reliably prevented from falling off the metal boss 105 by the washer 106 and the protruding portion 503 serving as a stopper. In this embodiment, even if the vertical movement of the fan boss 102 due to the expansion and contraction of the resin caused by the expected temperature change occurs, each of the fan bosses 102 and the protruding portion 503 are not immediately brought into contact with each other. Gaps (502, 504) are provided between the stopper and the fan boss 102.

  As described above, according to the structure of the present embodiment, even when an unexpected temperature change occurs and the fan boss 102 expands or contracts greatly, the fan boss 102 does not fall out of the metal boss 105. A highly reliable air conditioning fan can be provided.

  Next, a turbo fan 601 to which a fitting-type metal boss is applied, which is an air conditioning fan of the third embodiment, will be described with reference to the cross-sectional view of FIG. In addition, duplication description is abbreviate | omitted about the point which is common in Example 1 or Example 2. FIG.

  A turbo fan 601 of this embodiment shown in FIG. 9 is configured by providing a plurality of blades 604 between a hub 602 and a shroud 603. The air flow 605 generated by the rotation of the turbo fan 601 is in a direction from the shroud 603 side toward the blade 604 side as indicated by an arrow. Although the type of fan is different, the basic structure of the fitting type metal boss is substantially the same as that of the first embodiment. However, in the metal boss 105 of FIG. 9, a vibration-proof rubber 701 that is a cylindrical rubber material is disposed between the metal boss outer peripheral side 105a and the metal boss inner peripheral side 105b. The reason for disposing the anti-vibration rubber 701 is to prevent the electromagnetic vibration of the motor from being transmitted to the resin fan. If there is no anti-vibration rubber, the electromagnetic vibration is transmitted to the resin fan, and the fan acts as a speaker and makes an unpleasant sound. By using the anti-vibration rubber 701, the generation of the unpleasant sound can be suppressed. it can.

  The anti-vibration rubber 701 and the metal boss 105 around it are fixed or, although not shown, the contact surfaces of each other are tapered, like the metal boss 105 and the fan boss 102 in FIG. In the latter case, it is possible to separate the metal boss and the anti-vibration rubber.

  Next, a structural diagram of an indoor unit of an air conditioner using the turbo fan 601 of the present embodiment will be shown using the sectional view of FIG. As shown here, an indoor unit 801 of an air conditioner has a motor 408 disposed in a box housing 802, a turbo fan 601 disposed on the shaft of the motor 408, and a grill on the upstream side of the turbo fan 601. 803 and a filter 804 are arranged, a heat exchanger 406 provided with a water receiver 806 at the lower part is arranged on the downstream side of the turbo fan 601, and a louver 807 is arranged on the downstream side of the heat exchanger 406.

  In the first and second embodiments, the motor 408 is disposed below the propeller fan 100, whereas in the third embodiment, the motor 408 is disposed above the turbo fan 601. The upper side is narrow and the lower side is wide. That is, also in the configuration of the third embodiment, the turbo fan 601 itself weight increases the fit with the metal boss 105, and in addition, the resin portion and the metal portion of the turbo fan 601 are separated during recycling. It can be implemented simply as in Examples 1 and 2.

100, 101: Propeller fan 102: Fan boss 103: Blade 104: Motor shaft 105: Metal boss 105a: Metal boss outer peripheral side 105b: Metal boss inner peripheral side 106: Washer 107: Nut 108: Contact surface 109: Fan boss upper surface 110 : Fan boss lower surface 111: Blowing direction 201: Resin boss 202: Resin rib 301: Metal boss 401: Outdoor unit 402: Bottom base 403: Shroud 404: Compressor 405: Electric box 406: Heat exchanger 407: Motor clamp 408: Motor 501: Fan boss upper surface 502: Gap between fan boss upper surface and washer 503: Projection 504: Gap between boss and stopper of metal boss 601: Turbo fan 602: Hub 603: Shroud 604: Blade 605: Air flow 701: Anti-vibration rubber 801: Air conditioner indoor unit 80 : Housing 803: Grill 804: Filter 805: bellmouth 806: water receiving 807: louver 808: air flow

Claims (9)

A plurality of resin blades;
A resin fan boss in which the plurality of resin blades are arranged on the outer peripheral side;
A metal boss whose outer periphery is fitted to the inner periphery of the resin fan boss, and whose inner periphery is fitted to the shaft;
An air conditioning fan comprising:
An air-conditioning fan, wherein the outer peripheral surface of the metal boss is a tapered surface that spreads from the upper side to the lower side. The air conditioning fan according to claim 1,
The air-conditioning fan characterized in that the length of the metal boss in the rotation axis direction at the contact portion between the metal boss and the resin fan boss is longer than the length of the resin fan boss in the rotation axis direction. The air conditioning fan according to claim 1 or 2,
The air-conditioning fan according to claim 1, wherein a cross-sectional shape of the metal boss on a surface perpendicular to the rotation axis direction is a substantially polygonal shape. In the air-conditioning fan according to any one of claims 1 to 3,
An air-conditioning fan having a protruding portion protruding in a radial direction at a part of a lower end surface of the metal boss. The air conditioning fan according to claim 4,
An air conditioning fan, wherein a gap is provided between the protruding portion and the fan boss portion. In the air conditioning fan according to any one of claims 1 to 5,
The air conditioning fan, wherein the tapered surface includes a curved surface. In the air conditioning fan according to any one of claims 1 to 6,
The said metal boss is comprised from the metal boss outer peripheral side, the metal boss outer peripheral side, and the rubber material provided among them, The air-conditioning fan characterized by the above-mentioned. A motor that outputs rotational driving force via a shaft;
The air conditioning fan according to any one of claims 1 to 7, which is fastened to the shaft via the metal boss,
An air conditioner comprising: The air conditioner according to claim 8,
At the tip of the shaft,
The air conditioning fan;
A washer for restricting movement of the air conditioning fan on the shaft;
A nut for fixing the washer;
Is provided,
The diameter of the washer is larger than the diameter of the metal boss on the non-motor side, and
An air conditioner characterized in that a gap is provided between the washer and the fan boss.

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