Fan and air conditioner

Abstract

A fan includes a fan member, a motor that drives to rotate the fan member, and a rotating shaft that is connected to the fan via a vibration prevention member and transmits a turning force of the motor to the fan. The vibration prevention member is an elastic member that connects an inner cylinder made of metal included in the rotating shaft and an outer cylinder made of metal included in the fan member. At least one of an outer circumferential section of the inner cylinder and an inner circumferential section of the outer cylinder is configured in a polygonal shape when viewed from the rotating shaft direction. A turning force received by the vibration prevention member acts as compression stress on an adhesion interface between a vibration prevention material and metal.

Claims

1. A fan comprising: a fan member; a motor that drives to rotate the fan member; and a rotating shaft that is connected to the fan member via a vibration prevention member and transmits a turning force of the motor to the fan member, wherein the vibration prevention member is composed of an elastic member, an inner cylinder made of metal and an outer cylinder made of metal, wherein the elastic member is joined to the inner cylinder and the outer cylinder, wherein the fan member contacts an outer surface of the outer cylinder of the vibration prevention member, wherein at least one of an outer circumferential section of the inner cylinder and an inner circumferential section of the outer cylinder is configured as a polygon when viewed from a rotating shaft direction, and wherein a tuning force of the motor is transmitted to the fan member via the outer cylinder, the elastic member and the inner cylinder of the vibration prevention member upon rotation of the rotating shaft.

2. The fan according to claim 1, wherein the polygon is in a range of a hexagon to a hexadecagon.

3. The fan according to claim 1, wherein the outer circumferential section and the inner circumferential section are same polygons when viewed from an axial direction of the motor, and one vertex of the polygon of the outer circumferential section, one vertex of the polygon of the inner circumferential section, and a center point of the polygon of the inner circumferential section are aligned in this order.

4. The fan according to claim 1, wherein a convex shape projecting toward the vibration prevention member is formed in at least one of the outer circumferential section and the inner circumferential section.

5. The fan according to claim 4, wherein the convex shape is formed in a center in an axial direction of the outer circumferential section or the inner circumferential section.

6. The fan according to claim 1, wherein a concave shape recessed toward an opposite direction of the vibration prevention member is formed in at least one of the outer circumferential section and the inner circumferential section.

7. The fan according to claim 6, wherein the concave shape is formed in a center in an axial direction of the outer circumferential section or the inner circumferential section.

8. The fan according to claim 1, wherein a convex shape projecting toward the vibration prevention member is formed in the outer circumferential section, and a concave shape recessed toward an opposite direction of the vibration prevention member is formed in the inner circumferential section and in a position in an axial direction corresponding to the convex shape.

9. The fan according to claim 1, wherein a convex shape projecting toward the vibration prevention member is formed in the inner circumferential section, and a concave shape recessed toward an opposite direction of the vibration prevention member is formed in the outer circumferential section and in a position in an axial direction corresponding to the convex shape.

10. The fan according to claim 1, wherein the elastic member is rubber or elastomer.

11. An air conditioner comprising: a compressor that compresses a refrigerant; an indoor heat exchanger that causes the refrigerant and indoor air to perform heat exchange; an indoor fan that blows the air to the indoor heat exchanger; a decompression device that decompresses the refrigerant; an outdoor heat exchanger that causes the refrigerant and outdoor air to perform heat exchange; and an outdoor fan that blows the air to the outdoor heat exchanger, wherein the fan according to claim 1 is used in at least the indoor fan or the outdoor fan.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a plan view of a vibration prevention member in a first embodiment viewed from the direction of a suction port of a fan member.

(2) FIG. 2 is a sectional view showing an indoor unit of an air conditioner in the first embodiment.

(3) FIG. 3 is a graph showing a relation between the number of vertices of a polygon of a joining section of an inner cylinder and a rubber material and stress at the vertices.

(4) FIG. 4 is a plan view of a vibration prevention member in a second embodiment viewed from the direction of a suction port of a fan member.

(5) FIG. 5 is a sectional view of a vibration prevention member of a fan in a third embodiment taken along a plane including a rotating shaft of a fan member.

(6) FIG. 6 is a sectional view of a vibration prevention member of a fan in a fourth embodiment taken along a plane including a rotating shaft of a fan member.

(7) FIG. 7 is a sectional view showing an example of an indoor unit of a conventional air conditioner.

(8) FIG. 8 is a sectional view of a conventional centrifugal fan taken along a plane including a rotating shaft.

(9) FIG. 9 is a plan view of a conventional vibration prevention member viewed from the direction of a suction port of the fan member.

DESCRIPTION OF EMBODIMENTS

(10) A fan of the present invention includes: a fan member; a motor that drives to rotate the fan member; and a rotating shaft that is connected to the fan via a vibration prevention member and transmits a turning force of the motor to the fan. The vibration prevention member is an elastic member that connects an inner cylinder made of metal included in the rotating shaft and an outer cylinder made of metal included in the fan member. At least one of an outer circumferential section of the inner cylinder and an inner circumferential section of the outer cylinder is configured as a polygon when viewed from the rotating shaft direction. According to the present invention, a turning force received by the vibration prevention member acts as compression stress on an adhesion interface between a vibration prevention material and metal. Therefore, it is possible to reduce shearing stress on the adhesion interface between the vibration prevention material and the metal and reduce excessive stress due to stress concentration.

(11) A first embodiment of the present invention is explained with reference to FIG. 1, FIG. 2, and FIG. 3. An air conditioner in this embodiment includes a compressor that compresses a refrigerant, an indoor heat exchanger that causes the refrigerant and the indoor air to perform heat exchange, an indoor fan that blows the air to the indoor heat exchanger, a decompression device that decompresses the refrigerant, an outdoor heat exchanger that causes the refrigerant and the outdoor air to perform heat exchange, and an outdoor fan that blows the air to the outdoor heat exchanger. A fan in this embodiment explained below is applied to at least the indoor fan or the outdoor fan.

(12) FIG. 2 is a sectional view showing an indoor unit of the air conditioner. The indoor unit is configured from a decorative panel 31 and a housing 32 connected to the decorative panel 31. The decorative panel 31 includes a suction grill 33 in the center. An outlet 35 including a wind directing plate 34 is disposed around the decorative panel 31. A centrifugal fan 5 including a motor 6 and a fan member 8 connected to a shaft 7 of the motor 6 is set in the housing 32. A vibration prevention member 1 is provided in the center of the fan member 8. The shaft 7 of the motor 6 and the fan member 8 are connected via the vibration prevention member 1. The motor 6 is operated, whereby the fan member 8 rotates. As a result, as indicated by an arrow 45 in FIG. 2, the indoor air is sucked into a suction port 9 of the fan member 8 through the suction grill 33, a filter 36 set in the suction grill 33, and a bell mouth 37 set in the housing 32. The indoor air is discharged from a discharge port 10 of the fan member 8 as indicated by an arrow 48. An indoor heat exchanger 38 is disposed to surround the centrifugal fan 5. The air discharged from the fan member 8 is subjected to heat exchange in the indoor heat exchanger 38 and thereafter blown out into a room from the outlet 35 as indicated by an arrow 47.

(13) A drain pan 39 for receiving dew concentration water caused in the indoor heat exchanger 38 during cooling is set below the indoor heat exchanger 38. The suction grill 33 is detachable from the decorative panel 31 together with the filter 36. This structure makes it easy to perform cleaning of the filter 36. An electrical component box 40, in which a not-shown control board for controlling the operation of the indoor unit is housed, is set on the lower surface of the bell mouth 37. This structure makes it possible to easily perform maintenance of the electrical component box 40 by opening the suction grill 33. The bell mouth 37 is attached to an inner circumference section of the drain pan 39 from below. This structure makes it possible to easily perform maintenance such as replacement of the fan member 8 and the motor 6 as well by opening the suction grill 33 and detaching the bell mouth 37.

(14) FIG. 1 is a plan view of the vibration prevention member 1 viewed from the direction of the suction port 7 of the fan member 6. In the vibration prevention member 1, an elastic member (a rubber material 4) is joined by vulcanized adhesion between an inner cylinder 2 made of metal and an outer cylinder 3 made of metal. In this embodiment, a joining section of the inner cylinder 2 made of metal and the rubber material 4 and a joining section of the outer cylinder 3 made of metal and the rubber material 4 are formed as an octagon. When the shaft 9 of the motor 8 rotates, a turning force is transmitted to the fan member 6 via the vibration prevention member 1. An electromagnetic exciting force generated by the motor 8 is absorbed and attenuated by the rubber material 4 to be prevented from being transmitted to the fan member 6. Occurrence of electromagnetic sound is suppressed. Since both of the joining section of the inner cylinder 2 and the rubber material 4 and the joining section of the outer cylinder 3 and the rubber material 4 are octagonal, on adhesive interfaces between the inner cylinder 2 and the rubber material 4 and between the outer cylinder 3 and the rubber material 4, a part of the turning force received by the vibration prevention member 1 acts as a compression stress against a joining surface of the inner cylinder 2 or the outer cylinder 3. Therefore, it is possible to reduce shearing stress compared with when the joining section is circular. Even if an adhesion failure occurs, it is possible to receive the turning force. Therefore, it is possible to transmit the turning force of the fan member.

(15) FIG. 3 is a graph showing calculation values of stress near vertices in the case in which the number of vertices of a polygon of the joining section of the inner cylinder 2 and the rubber material 4 is changed. By forming the joining section as the polygon, it is possible to reduce shearing stress in the portions of the sides of the polygon. However, stress concentration is sometimes caused in the portions of the vertices of the polygon. It is seen from FIG. 3 that, whereas the stress suddenly increases when the number of the vertices of the polygon decrease, the stress hardly changes when the number of vertices of the polygon is equal to or larger than sixteen. When the vertices of the polygon increase, an area capable of receiving the turning force as the compression stress decreases. Therefore, it is desirable to reduce the number of the vertices in a range in which reliability can be secured. Therefore, it is desirable to select the number of the vertices in a range of 6 to 16.

(16) Note that, in this embodiment, both of the joining section of the inner cylinder 2 and the rubber material 4 and the joining section of the outer cylinder 3 and the rubber material 4 are octagonal. However, for example, for convenience in manufacturing, it is also possible to form only one of the joining sections as a polygon and form the other as a circle as in the past.

(17) A second embodiment of the present invention is explained with reference to FIG. 4. FIG. 4 is a plan view of a vibration prevention member 11 of a fan viewed from the direction of a suction port of a fan member. As in the first embodiment, the vibration prevention member 11 is configured by joining, with vulcanized adhesion, a rubber material 14 between an inner cylinder 12 made of metal and an outer cylinder 13 made of metal.

(18) Both of a joining section of the inner cylinder 12 and the rubber material 14 and a joining section of the outer cylinder 13 and the rubber material 14 are formed in octagonal similar shapes. In this embodiment, the vibration prevention member 11 is configured such that one vertex a of a polygon, which is the outer circumference of the inner cylinder 12, one vertex A of a polygon, which is the inner circumference of the outer cylinder 13, and a center point O of the polygons are aligned in this order. The outer circumference of the inner cylinder 12 and the inner circumference of the outer cylinder 13 are formed as similar octagons. Therefore, the other vertices of the outer circumference are also aligned with any vertices and the center point O of the polygons. Consequently, compared with the first embodiment, a change in the thickness in the radial direction of the rubber material 14 decreases. A vibration prevention effect of an elastic material such as rubber is affected by thickness. The vibration prevention effect decreases when the thickness is small. When the change in the thickness in the radial direction is large, it is likely that a portion where the thickness is small is formed and the vibration prevention effect decreases. In this embodiment, since the change in the thickness can be reduced, it is possible to suppress the decrease in the vibration prevention effect.

(19) A third embodiment of the present invention is explained with reference to FIG. 5. FIG. 5 is a sectional view of a vibration prevention member 15 of a fan taken along a plane including a rotating shaft of a fan member. As in the embodiments explained above, the vibration prevention member 15 is configured by joining, with vulcanized adhesion, a rubber material 18 between an inner cylinder 16 made of metal and an outer cylinder 17 made of metal.

(20) In this embodiment, in an outer circumferential section of the inner cylinder 16 and an inner circumferential section of the outer cylinder 17, convex shapes 19 and 20 projecting toward the rubber material 18 side are provided in the centers in the axial direction of the outer circumferential section and the inner circumferential section. Ina fan member in which a suction port is provided vertically downward, downward gravity is always applied to the fan member. If the rubber material 18 and the inner cylinder 16 or the outer cylinder 17 are disjoined because of an adhesion failure or the like, the fan member drops. However, in the fan member in this embodiment, since the rubber material 18 can be supported by the convex shapes 19 and 20 in the centers, it is possible to prevent the fan member from dropping.

(21) Note that the positions of the convex shapes 19 and 20 do not have to be the centers in the axial direction. The convex shapes 19 and 20 may be provided in different positions in the axial direction in the inner cylinder 16 and the outer cylinder 17. By providing the convex shapes 19 and 20 in the centers in the axial direction as in this embodiment, the vibration prevention member becomes symmetrical in the up-down direction. Workability is improved because it is unnecessary to take into account the up-down direction during manufacturing of the fan member. A convex shape may be provided in only one of the inner cylinder 16 and the outer cylinder 17. If an inner cylinder and an outer cylinder are manufactured by die-cast, it is possible to reduce man-hour of cutting and reduce cost. Further, the convex shape in this embodiment may be changed to a concave shape formed by recessing the inner cylinder or the outer cylinder in the opposite direction of the rubber material.

(22) A fourth embodiment of the present invention is explained with reference to FIG. 6. FIG. 6 is a sectional view of a vibration prevention member 21 of a fan taken along a plane including a rotating shaft of a fan member. As in the embodiments explained above, the vibration prevention member 15 is configured by joining, with vulcanized adhesion, the rubber material 18 between the inner cylinder 16 made of metal and the outer cylinder 17 made of metal.

(23) In this embodiment, a concave shape 25 recessed in the opposite direction of a rubber material 24 is provided in an outer circumferential section of the inner cylinder 22 and a convex shape 26 projecting toward the rubber material 24 is provided in an inner circumferential section of the outer cylinder 23. The concave shape 25 of the inner cylinder 22 and the convex shape 26 of the outer cylinder 23 are provided in the same position in the axial direction of the vibration prevention member 21. In the vibration prevention member in the third embodiment, it is likely that the thickness of the rubber material decreases in the convex shape section and vibration prevention performance is deteriorated. On the other hand, in this embodiment, if the rubber material 24 and the inner cylinder 22 or the outer cylinder 23 are disjoined because of an adhesion failure or the like, the rubber material 24 can be supported by the concave shape 25 of the inner cylinder 22 or the convex shape 26 of the outer cylinder 23. In addition, the thickness in the radial direction of the rubber material 24 can be fixed over the entire length in the axial direction of the vibration prevention member 21. Therefore, it is possible to suppress a decrease in vibration reduction of the vibration prevention member 21. Note that the same effect can be obtained even if the concave shape 25 is formed in a convex shape and the convex shape 26 is formed in a concave shape.

(24) In the embodiments, the rubber material is used in the vibration prevention member. However, an elastic body such as elastomer can be used. The fan is the centrifugal fan including the centrifugal fan member. However, the present invention can also be applied to fans of other forms such as an axial fan and a multi-blade fan. Further, in the embodiments, the example is explained in which the fan of the present invention is applied to the indoor unit of the ceiling embedded cassette type. However, the present invention can also be applied to indoor units of other forms and outdoor units of an upper blowing type, a lateral blowing type, and the like.

REFERENCE SIGNS LIST

(25) 1, 11, 15, 21, 126 vibration prevention member

(26) 2, 12, 16, 22, 123 inner cylinder

(27) 3, 13, 17, 23, 124 outer cylinder

(28) 4, 14, 18, 24, 125 rubber material

(29) 5, 121 centrifugal fan

(30) 6, 106 motor

(31) 7, 120 shaft

(32) 8, 107 fan member

(33) 9, 112 suction port of the fan member