Blower and refrigeration equipment

Abstract

To provide a blower that can suppress the overheating of the rotating shaft. [Solution] The blower 40 comprises a stator 70, a sliding bearing 80 positioned at the axial center of the stator 70, a rotating shaft 90 rotatably supported by the sliding bearing 80, a rotor 100 having a flange 101 made of resin fixed to the rotating shaft 90 and permanent magnets 102 fixed to the flange 101, and a cross-flow fan 60 fixed to the flange 101 and positioned on the opposite side of the flange 101 from the side on which the stator 70 is positioned. The blower 40 also includes a cooling unit 110 for cooling the rotating shaft 90, and the cooling unit 110 is provided in the space inside the cross-flow fan 60.

Description

Technical Field

[0001] The present disclosure relates to a blower and a refrigeration device.

Background Art

[0002] Conventionally, as a blower used in a refrigeration device or the like, there is one provided with a cross-flow fan (see, for example, Patent Document 1). The disk-shaped resin body constituting the end wall of this cross-flow fan is a common component with a flange fixed to a rotating shaft, and the flange constitutes a part of a rotor by fixing a permanent magnet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a configuration in which a resin flange is fixed to a metal rotating shaft, there is a concern about the occurrence of a gap due to the difference in the linear expansion coefficients of the rotating shaft and the flange. Specifically, for example, a gap may occur between the rotating shaft and the flange based on the fact that the rotating shaft becomes high temperature due to frictional heat generated between the sliding bearing and the rotating shaft. As a result, there is a risk that the fixing strength between the rotating shaft and the flange may decrease.

[0005] An object of the present disclosure is to provide a blower and a refrigeration device capable of suppressing the rotating shaft from becoming high temperature.

Means for Solving the Problems

[0006] A blower according to the first aspect of solving this problem comprises a stator, a sliding bearing disposed at the axial center of the stator, a rotating shaft rotatably supported by the sliding bearing, a rotor having a flange made of resin fixed to the rotating shaft and a permanent magnet fixed to the flange, and a cross-flow fan fixed to the flange and disposed on the side opposite to the side on which the stator is disposed relative to the flange, wherein the blower comprises a cooling unit for cooling the rotating shaft, the cooling unit being provided in the space inside the cross-flow fan, or being provided in a position facing the space inside the cross-flow fan.

[0007] In this configuration, the cooling unit for cooling the rotating shaft is located in the space inside the cross-flow fan, or in a position facing the space inside the cross-flow fan, and is therefore effectively cooled by the air flowing inside the cross-flow fan. Since the cross-flow fan is a fan in which air passes through the inside when viewed in the axial direction, the cooling unit is cooled more effectively than, for example, a fan that draws in air from the axial direction and blows it out radially outward. As a result, even if frictional heat is generated between the sliding bearing and the rotating shaft, the rotating shaft is prevented from becoming too hot. Therefore, the generation of gaps based on the difference in the coefficient of linear expansion between the rotating shaft and the flange made of resin is suppressed, and consequently, the reduction in the fixing strength between the rotating shaft and the flange is suppressed.

[0008] A blower in the second aspect is a blower in the first aspect, wherein the rotating shaft has a first portion, the first portion is located in the space inside the cross-flow fan, and the cooling section includes the first portion.

[0009] In this configuration, the air flowing inside the cross-flow fan strikes the first part that constitutes the cooling section, thus effectively cooling the section. Furthermore, since the cooling section is part of the rotating shaft, the configuration is simpler compared to, for example, a configuration where a separate component is connected, and the rotating shaft can be cooled efficiently.

[0010] The blower in the third aspect is the blower in the second aspect, wherein the cooling section has fins provided in the first part. With this configuration, the fins increase the surface area of ​​the cooling section, allowing it to be cooled more effectively.

[0011] The fourth aspect of the blower is the blower of the third aspect, wherein the fins are formed in a concentric, annular shape with respect to the first portion. With this configuration, the fins are less likely to create resistance to the air flowing inside the cross-flow fan compared to, for example, fins that protrude radially outward from a circumferential portion of the first part, thus suppressing a decrease in the airflow capacity of the cross-flow fan.

[0012] In the fifth aspect of the blower, in any one of the second aspect or the fourth aspect, the axial length of the first portion is 1 / 3 or more of the axial length of the rotating shaft. This configuration allows for more effective cooling of the rotating shaft compared to, for example, a configuration in which the axial length of the first part is less than one-third of the axial length of the rotating shaft.

[0013] The sixth aspect of the blower is the blower of the first aspect, wherein the cooling section has a first member provided in the space inside the cross-flow fan, positioned on the side of the flange where the cross-flow fan is located, and the first member is connected to the rotating shaft.

[0014] In this configuration, the air flowing inside the cross-flow fan strikes the first component that makes up the cooling section, thus effectively cooling the cooling section. The seventh aspect of the blower, in any one of the first to sixth aspects of the blower, has a second member which is positioned between the rotating shaft and the flange and facing the space inside the cross-flow fan, and the second member is connected to the rotating shaft.

[0015] According to this configuration, the air flowing inside the cross-flow fan flows along the end face of the second member, so the cooling part is effectively cooled. Further, since the second member can be arranged so as not to become a resistance to the air flowing inside the cross-flow fan, a decrease in the blowing ability of the cross-flow fan can be suppressed.

[0016] The refrigeration device according to the eighth aspect includes any one of the blowers according to the first to seventh aspects. According to this configuration, it is possible to suppress the rotation shaft from becoming high temperature in the refrigeration device.

Brief Description of the Drawings

[0017] [Figure 1] It is a schematic diagram of a refrigeration device in an embodiment. [Figure 2] It is a partial cross-sectional view of a blower in an embodiment. [Figure 3] It is a partial cross-sectional schematic diagram of a refrigeration device in an embodiment. [Figure 4] It is a partial cross-sectional view of a blower in another example. [Figure 5] It is a partial cross-sectional view of a blower in another example. <000008th> [Figure 6] It is a partial cross-sectional view of a blower in another example.

Mode for Carrying Out the Invention

[0018] Referring to FIGS. 1 to 3, the refrigeration device and the blower will be described. <Refrigeration Device 10> As shown in FIG. 1, the refrigeration device 10 is an air conditioner, and includes an indoor unit 20 installed indoors and an outdoor unit 30 installed outdoors. The indoor unit 20 includes a blower 40 inside.

[0019] <Blower 40> As shown in FIGS. 1 and 2, the blower 40 includes a motor 50 and a cross-flow fan 60.

[0020] <Motor 50> As shown in Figure 2, the motor 50 comprises a stator 70, a sliding bearing 80, a rotating shaft 90, and a rotor 100.

[0021] The stator 70 comprises a stator core 71, windings 72, and a mold 73. The stator 70 is formed in a cylindrical shape overall. The stator core 71 is made of laminated electrical steel sheets, for example. The stator core 71 has teeth 74 that extend radially and are arranged in parallel in the circumferential direction. The windings 72 are wound around the teeth 74. The windings 72 are electrically connected to a power supply (not shown). The mold 73 is made of resin and is formed to cover the stator core 71 and the windings 72. When a drive current is supplied to the windings 72, the stator 70 generates a rotating magnetic field on its outer circumference.

[0022] The sliding bearing 80 is positioned at the axial center of the stator 70. The sliding bearing 80 is fixed to the inner circumference of the stator 70 by a fixing member 81. The fixing member 81 is fitted to the inner circumference of the stator 70 while holding the sliding bearing 80 on its inner circumference.

[0023] The rotating shaft 90 is rotatably supported by the sliding bearing 80. More specifically, the outer surface of the rotating shaft 90 is positioned to slide against the inner surface of the sliding bearing 80. As a result, the rotating shaft 90 is rotatably supported by the sliding bearing 80 with its own axis center as the axis of rotation Z. The rotating shaft 90 is made of metal.

[0024] The rotor 100 has a flange 101 fixed to the rotating shaft 90 and a permanent magnet 102 fixed to the flange 101. The flange 101 is made of resin. The flange 101 is formed in a disc shape. The flange 101 has a central hole 103 fixed to the outer circumferential surface of the rotating shaft 90. The flange 101 is fixed to a portion of the rotating shaft 90 that protrudes outward from the stator 70 in the axial direction.

[0025] The permanent magnet 102 is formed in a cylindrical shape and has multiple magnetic poles in the circumferential direction. The axial end of the permanent magnet 102 is fixed to the outer edge side of the flange 101. The permanent magnet 102 is positioned so that its inner circumferential surface faces the outer circumferential surface of the stator 70.

[0026] The rotating shaft 90, flange 101, and permanent magnet 102 are integrally molded parts. More specifically, the rotating shaft 90, flange 101, and permanent magnet 102 are integrally molded by insert molding, with the rotating shaft 90 and permanent magnet 102 acting as insert parts. As a result, the flange 101 is fixed to the rotating shaft 90. The outer surface of the rotating shaft 90 where the flange 101 is fixed is knurled (not shown).

[0027] <Cross-flow fan 60> The cross-flow fan 60 is fixed to the flange 101. The cross-flow fan 60 is positioned on the opposite side of the flange 101 from where the stator 70 is located (the left side in Figure 2). The cross-flow fan 60 is formed in an elongated shape along the rotation axis Z.

[0028] As shown in Figure 3, the cross-flow fan 60 has multiple blades 61 arranged in a parallel fashion in the circumferential direction around the rotation axis Z. The cross-flow fan 60 is positioned inside the indoor unit 20 (see Figure 1) between the front guide 62 and the rear guide 63. The front guide 62 and the rear guide 63 form an intake port 64 that opens upward and an outlet port 65 that opens to the side.

[0029] As shown in Figure 2, in this embodiment, the blades 61 of the cross-flow fan 60 are fixed to the flange 101. That is, the flange 101 constitutes the end wall of the cross-flow fan 60. When the rotor 100 is driven to rotate around the rotation axis Z, the cross-flow fan 60 rotates together with the rotor 100.

[0030] As shown in Figure 3, the cross-flow fan 60 rotates to draw in air K from the intake port 64 and blow out the drawn-in air K from the outlet port 65. In Figures 2 and 3, the air K is schematically illustrated as an arrow pointing in the direction of air flow.

[0031] Here, as shown in Figure 2, the blower 40 of this embodiment is equipped with a cooling unit 110 for cooling the rotating shaft 90. <Cooling section 110> The cooling unit 110 of this embodiment includes a first portion 91, which is a part of the rotating shaft 90. More specifically, the rotating shaft 90 has a first portion 91 and a second portion 92. The first portion 91 is the part of the rotating shaft 90 located on the side of the flange 101 where the cross-flow fan 60 is positioned (left side in Figure 2). The second portion 92 includes the part to which the flange 101 is fixed, and is the part located on the side of the flange 101 where the stator 70 is positioned (right side in Figure 2). The first portion 91 is provided in the space inside the cross-flow fan 60. The axial length X1 of the first portion 91 is 1 / 3 or more of the total axial length X2 of the rotating shaft 90. In this embodiment, the axial length X1 of the first portion 91 is set to be 1 / 2 or more of the axial length X2 of the rotating shaft 90, and slightly longer than 1 / 2 of the axial length X2 of the rotating shaft 90.

[0032] The operation of this embodiment will now be explained. When a drive current is supplied to the winding 72, a rotating magnetic field is generated on the outer circumference of the stator 70. As a result, the rotor 100 is driven to rotate around the rotation axis Z, and the cross-flow fan 60 rotates. Then, the air K cooled by a heat exchanger (not shown) is drawn into the cross-flow fan 60 from the intake port 64 and then blown out from the outlet port 65.

[0033] The effects of this embodiment will now be explained. (1) The cooling unit 110 for cooling the rotating shaft 90 is located in the space inside the cross-flow fan 60, and is therefore effectively cooled by the air K flowing inside the cross-flow fan 60. Since the cross-flow fan 60 is a fan through which air K passes axially, the cooling unit 110 is cooled more effectively than, for example, a fan that draws in air K axially and blows it radially outward. As a result, even if frictional heat is generated between the sliding bearing 80 and the rotating shaft 90, the rotating shaft 90 is prevented from becoming hot. Therefore, the generation of a gap based on the difference in the coefficient of linear expansion between the rotating shaft 90 and the flange 101 made of resin is suppressed. As a result, a decrease in the fixing strength between the rotating shaft 90 and the flange 101 is suppressed.

[0034] (2) The first part 91 constituting the cooling section 110 is located on the side of the rotating shaft 90 where the cross-flow fan 60 is positioned (left side in Figure 2) relative to the flange 101. Therefore, the air K flowing inside the cross-flow fan 60 strikes the first part 91 constituting the cooling section 110, so the cooling section 110 is effectively cooled. Furthermore, since the cooling section 110 is part of the rotating shaft 90, the configuration is simpler compared to, for example, a configuration in which a separate part is connected, and the rotating shaft 90 can be cooled efficiently.

[0035] (3) Since the axial length X1 of the first part 91 is 1 / 3 or more of the axial length X2 of the rotating shaft 90, the rotating shaft 90 can be cooled more effectively than, for example, a configuration in which the axial length X1 of the first part 91 is less than 1 / 3 of the axial length X2 of the rotating shaft 90. Also, in this embodiment, since the axial length X1 of the first part 91 is 1 / 2 or more of the axial length X2 of the rotating shaft 90, the rotating shaft 90 can be cooled more effectively than, for example, a configuration in which the axial length X1 of the first part 91 is less than 1 / 2 of the axial length X2 of the rotating shaft 90.

[0036] <Variation> In addition to the embodiments described above, the refrigeration device 10 and blower 40 of this disclosure may also be modified in the following ways, or in combination of at least two mutually non-inconsistent modifications.

[0037] In the above embodiment, the cooling unit 110 is the first portion 91 of the rotating shaft 90, but it is not limited to this. The cooling unit 110 may also include other cooling units provided in the space inside the cross-flow fan 60, or other cooling units provided in a position facing the space inside the cross-flow fan 60.

[0038] For example, the design may be modified as shown in Figure 4. In this example (see Figure 4), the cooling section 110 has the first portion 91 of the above embodiment and fins 120 provided on the first portion 91. The fins 120 protrude radially outward from the first portion 91. The fins 120 are made of metal. In this example, the fins 120 are formed in an annular shape concentric with the first portion 91. In other words, the fins 120 in this example protrude radially outward from the entire circumference of the first portion 91.

[0039] In this configuration, the surface area of ​​the cooling section 110 increases due to the fins 120, thus allowing the cooling section 110 to be cooled more effectively. Furthermore, since the fins 120 in this example are formed in an annular shape, they are less likely to create resistance to the air K flowing inside the cross-flow fan 60 compared to, for example, a configuration where the fins protrude radially outward from a part of the circumferential direction of the first section 91. Therefore, a decrease in the airflow capacity of the cross-flow fan 60 can be suppressed.

[0040] Furthermore, the design may be modified, for example, as shown in Figure 5. In this example (see Figure 5), the cooling unit 110 has a first member 130. Note that the rotating shaft 90 in this example does not have the first part 91 of the above embodiment. The first member 130 is connected to the rotating shaft 90. The first member 130 is positioned on the side of the flange 101 where the cross-flow fan 60 is located (left side in Figure 5), and is provided in the space inside the cross-flow fan 60. That is, in this example, the cooling unit 110 is configured such that a first member 130, separate from the rotating shaft 90, is connected to the rotating shaft 90 so as to extend the rotating shaft 90 on the rotation axis Z. The first member 130 is made of metal. The metal constituting the first member 130 may be a different material from the metal constituting the rotating shaft 90. For example, the metal constituting the first member 130 may be a material with a higher thermal conductivity than the metal constituting the rotating shaft 90. Also, for example, the metal constituting the first member 130 may be a lighter material than the metal constituting the rotating shaft 90. Furthermore, although Figure 5 shows the diameter of the first member 130 as being the same as the diameter of the rotating shaft 90, they may be different. Also, the first member 130 may be connected to the rotating shaft 90 by, for example, welding or adhesive.

[0041] Even in this manner, the air K flowing inside the cross-flow fan 60 strikes the first member 130 that constitutes the cooling unit 110, so the cooling unit 110 is effectively cooled.

[0042] Furthermore, the design may be modified, for example, as shown in Figure 6. In this example (see Figure 6), the cooling unit 110 has a second member 140. Note that the rotating shaft 90 in this example does not have the first part 91 of the above embodiment. The second member 140 is connected to the rotating shaft 90. The second member 140 is positioned between the rotating shaft 90 and the flange 101, so as to face the space inside the cross-flow fan 60. The second member 140 is made of metal. The metal constituting the second member 140 may be a different material from the metal constituting the rotating shaft 90. For example, the metal constituting the second member 140 may be a material with a higher thermal conductivity than the metal constituting the rotating shaft 90. Also, for example, the metal constituting the second member 140 may be a lighter material than the metal constituting the rotating shaft 90. Furthermore, the second member 140 may be connected to the rotating shaft 90 by welding, bonding, or press-fitting (interference fit), for example.

[0043] In this configuration, the air K flowing inside the cross-flow fan 60 flows along the end face of the second member 140, thereby effectively cooling the cooling section 110. Furthermore, since the second member 140 can be positioned so as not to resist the air K flowing inside the cross-flow fan 60, a decrease in the airflow capacity of the cross-flow fan 60 can be suppressed. In this example, the cooling section 110 does not have the first part 91 of the above embodiment, but it may have the first part 91, or it may have fins 120, or it may have the first member 130.

[0044] In the above embodiment, the blower 40 is provided in the refrigeration device 10, but it is not limited to this, and a blower 40 used for other purposes may also be used. Although embodiments of the refrigeration device 10 and blower 40 have been described above, it will be understood that various modifications to the form and details are possible without departing from the spirit and scope of the refrigeration device 10 and blower 40 as described in the claims. [Explanation of Symbols]

[0045] X1...Length, X2...Length, 10...Refrigeration unit, 40...Blower, 60...Cross-flow fan, 70...Stator, 73...Mold, 80...Sliding bearing, 90...Rotating shaft, 91...First part, 92...Second part, 100...Rotor, 101...Flange, 102...Permanent magnet, 110...Cooling section, 120...Fin, 130...First component, 140...Second component.

Claims

1. Stator (70) and, A sliding bearing (80) is positioned at the axial center of the stator (70), A rotating shaft (90) is rotatably supported by the sliding bearing (80), A rotor (100) having a flange (101) made of resin fixed to the rotating shaft (90), and a permanent magnet (102) fixed to the flange (101), A blower comprising: a cross-flow fan (60) fixed to the flange (101) and positioned on the opposite side of the flange (101) from the side on which the stator (70) is positioned, wherein the permanent magnet (102) is positioned such that its inner surface faces the outer surface of the stator (70), The rotating shaft (90) is provided with a cooling unit (110), The cooling unit (110) is provided in the space inside the cross-flow fan (60), or is provided in a position facing the space inside the cross-flow fan (60). The rotating shaft (90) has a first portion (91) as the cooling section (110) and is made of metal. The first portion (91) is positioned on the side of the flange (101) where the cross-flow fan (60) is located, so that the circumferential surface of the first portion (91) is exposed to the space inside the cross-flow fan (60). The axial length (X1) of the first portion (91) is at least one-third of the axial length (X2) of the rotation axis (90). Blower.

2. The cooling section (110) has fins (120) provided on the first portion (91), The fin (120) is made of metal. The blower according to claim 1.

3. The fin (120) is formed in an annular shape concentric with the first portion (91), The blower according to claim 2.

4. Stator (70) and, A sliding bearing (80) is positioned at the axial center of the stator (70), A rotating shaft (90) is rotatably supported by the sliding bearing (80), A rotor (100) having a flange (101) made of resin fixed to the rotating shaft (90), and a permanent magnet (102) fixed to the flange (101), A blower comprising: a cross-flow fan (60) fixed to the flange (101) and positioned on the opposite side of the flange (101) from the side on which the stator (70) is positioned, wherein the permanent magnet (102) is positioned such that its inner surface faces the outer surface of the stator (70), The rotating shaft (90) is provided with a cooling unit (110), The aforementioned rotating shaft (90) is made of metal, The cooling unit (110) is provided in the space inside the cross-flow fan (60), or is provided in a position facing the space inside the cross-flow fan (60). The cooling section (110) has a first member (130) which is provided in the space inside the cross-flow fan (60) by being positioned on the side of the flange (101) where the cross-flow fan (60) is located. The first member (130) is made of metal, and is positioned such that its circumferential surface is exposed to the space inside the cross-flow fan (60), and is connected to the rotating shaft (90). Blower.

5. Stator (70) and, A sliding bearing (80) is positioned at the axial center of the stator (70), A rotating shaft (90) is rotatably supported by the sliding bearing (80), A rotor (100) having a flange (101) made of resin fixed to the rotating shaft (90), and a permanent magnet (102) fixed to the flange (101), A blower comprising: a cross-flow fan (60) fixed to the flange (101) and positioned on the opposite side of the flange (101) from the side on which the stator (70) is positioned, wherein the permanent magnet (102) is positioned such that its inner surface faces the outer surface of the stator (70), The rotating shaft (90) is provided with a cooling unit (110), The aforementioned rotating shaft (90) is made of metal, The cooling unit (110) is provided in the space inside the cross-flow fan (60), or is provided in a position facing the space inside the cross-flow fan (60). The cooling section (110) has a second member (140) which is positioned between the rotating shaft (90) and the flange (101) in the radial direction and facing the space inside the cross-flow fan (60). The second member (140) is made of metal and is arranged such that the flange (101) is connected to the outer peripheral end of the second member (140). The second member (140) is connected to the rotating shaft (90), Blower.

6. A refrigeration apparatus comprising a blower (40) according to any one of claims 1 to 5.

Images