CN210889384U - Air supply device and hot water supply device - Google Patents

Abstract

Provided are an air blowing device and a hot water supply device, wherein the air blowing device is provided with: a rotor having a shaft disposed along a central axis extending in an up-down direction; a stator that is radially opposed to the rotor; a motor housing surrounding the rotor and the stator; an impeller attached to the shaft at a position axially below the motor housing and rotatable about the central axis; an impeller housing surrounding the impeller; and a fitting member that connects the motor housing and the impeller housing with a gap therebetween in the axial direction. The impeller has: an impeller base portion that extends in a direction intersecting the axial direction; and a plurality of impeller blades arranged in the circumferential direction on the lower surface of the impeller base portion. At least a part of the 1 st fixing member that fixes the attachment member and the impeller housing is disposed radially inward of a radially outer end of the impeller base portion.

Description

Air supply device and hot water supply device

Technical Field

The utility model relates to an air supply arrangement and hot water provide the device.

Background

An electric fan is disclosed in japanese patent laid-open publication No. 2017-193988. The electric fan is a sirocco fan and has a blower case, an impeller, and an electric motor.

The blower case is a box-shaped case member. The blower case is formed with an air intake port that takes air into the inner diameter side of the impeller, and an air passage that collects air blown out of the impeller toward the outer diameter side and guides the air to the air outlet port. A recess recessed toward the inside of the blower case is formed in the bottom surface of the blower case on the opposite side of the surface on which the air intake port is formed.

The electric motor has a motor case that fixes the electric motor to the blower case. The motor case has a cylindrical portion having a bottom and a cylindrical shape, and a flange portion extending radially outward from an opening edge of the cylindrical portion. The flange portion and the bottom surface of the blower case are coupled by mounting screws. The mounting screw is fastened to the recess of the blower case.

Patent document 1: japanese patent laid-open publication No. 2017-193988

In the electric fan disclosed in japanese patent laid-open publication No. 2017-193988, the following configuration is adopted: in order to fix the electric motor, a recess provided in the blower case is projected into the air passage of the blower case. The fixing structure protruding into the air passage may interfere with air blowing.

In the electric fan disclosed in japanese patent application laid-open No. 2017-193988, the motor case is coupled to the blower case by the mounting screws, and the motor case is located at a very short distance from the blower case in the axial direction. Therefore, when the temperature of the air sucked into the blower case by the rotation of the impeller is high, the electric motor may be easily affected by heat.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can restrain the motor and receive thermal influence to can restrain the technique of the reduction of air supply efficiency of air supply arrangement.

The utility model discloses an air supply arrangement of mode of exemplification has: a rotor having a shaft disposed along a central axis extending in an up-down direction; a stator that is radially opposed to the rotor; a motor housing surrounding the rotor and the stator; an impeller attached to the shaft at a position axially below the motor housing and rotatable about the central axis; an impeller housing surrounding the impeller; and a fitting member that connects the motor housing and the impeller housing with a gap therebetween in the axial direction. The impeller has: an impeller base portion that extends in a direction intersecting the axial direction; and a plurality of impeller blades arranged in the circumferential direction on the lower surface of the impeller base portion. At least a part of the 1 st fixing member that fixes the attachment member and the impeller housing is disposed radially inward of a radially outer end of the impeller base portion.

In the above aspect, the lower end of the 1 st fixing member protrudes downward from the lower surface of the upper wall of the impeller housing.

In the above aspect, the plurality of fitting parts are arranged at equal intervals in the circumferential direction.

In the above aspect, the accessory member includes: a 1 st arm portion extending in a radial direction; a connecting portion extending upward in an axial direction from a radially outer end portion of the 1 st arm portion; and a 2 nd arm portion extending radially inward from an upper end portion of the connecting portion.

In the above aspect, a rotary blade fixed to the shaft is disposed radially inward of the attachment member.

In the above aspect, the 2 nd fixing member that fixes the accessory member and the motor housing and the 1 st fixing member are arranged at the same position in the circumferential direction.

In the above aspect, the 1 st fixing member and the 2 nd fixing member are screws having screw threads and extending in the axial direction, and the 1 st fixing member and the 2 nd fixing member are disposed at different positions in the radial direction.

In the above aspect, the 1 st fixing member is a screw having a thread, and a body portion extending in an axial direction, a head portion of the screw is disposed inside the impeller casing, an impeller casing opening portion penetrating in the axial direction is provided in a bottom wall of the impeller casing, and the head portion of the screw is disposed radially inward of an inner wall of the impeller casing opening portion.

In the above aspect, the 1 st fixing member is a screw having a main body portion with a thread extending in an axial direction, and a head portion of the screw is disposed above the main body portion.

The exemplary hot water supply device of the present invention includes: a combustion unit that generates combustion gas; a heat exchange unit that exchanges heat between the combustion gas and a heat medium; and the air supply device.

According to the present invention, the influence of heat on the motor can be suppressed, and the reduction in the air supply efficiency of the air supply device can be suppressed.

Drawings

Fig. 1 is a schematic view of a hot water supply device according to an embodiment of the present invention.

Fig. 2 is a perspective view of an air blower according to an embodiment of the present invention.

Fig. 3 is a longitudinal sectional view of the air blowing device according to the embodiment of the present invention.

Fig. 4 is a perspective view of a motor according to an embodiment of the present invention.

Fig. 5 is a longitudinal sectional view of the motor according to the embodiment of the present invention.

Fig. 6 is an enlarged view showing a portion surrounded by a broken line frame of fig. 3.

Fig. 7 is a perspective view of an accessory part according to an embodiment of the present invention.

Fig. 8 is a perspective view of a rotary blade according to an embodiment of the present invention.

Fig. 9 is a diagram showing a modification of the air blowing device according to the embodiment of the present invention.

Description of the reference symbols

2: an air supply device; 11: a shaft; 12: a rotor; 13: a stator; 15: a rotating blade; 16. 16A: a motor housing; 21: an impeller; 22. 22A: an impeller housing; 25. 25A: a fitting component; 31. 31A: 1 st fixing member; 32. 32A: a 2 nd fixing member; 100: a hot water supply device; 101: a combustion section; 102: a heat exchange section; 211: an impeller base portion; 212: an impeller blade; 221: an impeller housing opening; 251: a 1 st arm part; 252: a connecting portion; 253: a 2 nd arm part; BP: a body portion of the screw; c: a central axis; HP: the head of the screw.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, when the motor 1 and the blower 2 are described, a direction parallel to the central axis C of the motor 1 shown in fig. 3 is referred to as an "axial direction", a direction perpendicular to the central axis C of the motor 1 is referred to as a "radial direction", and a direction along an arc centered on the central axis C of the motor 1 is referred to as a "circumferential direction". In the present description, when the motor 1 and the blower 2 are described, the axial direction is taken as the vertical direction, and the motor 1 side is taken as the upper side with respect to the impeller 21 shown in fig. 3, thereby describing the shape and positional relationship of the respective parts. The vertical direction is a name for explanation only, and does not limit the actual positional relationship and direction. In the present specification, "upstream" and "downstream" respectively represent upstream and downstream in the flow direction of the combustion gas generated by the combustion unit 101 shown in fig. 1.

< 1. Hot Water supply device

Fig. 1 is a schematic view of a hot water supply device 100 according to an embodiment of the present invention. In the present embodiment, the hot water supply device 100 is a gas hot water supply device. As shown in fig. 1, the hot water supply device 100 includes a combustion unit 101, a heat exchange unit 102, and an air blower 2. The hot water supply device 100 also has an outer housing 103 and an inner housing 104. The outer casing 103 houses the combustion unit 101, the heat exchange unit 102, the blower 2, and the inner casing 104.

The combustion unit 101 burns fuel during the hot water supply operation. The combustion unit 101 generates combustion gas. Specifically, the combustion unit 101 is a gas burner. The combustion section 101 is disposed at an upstream portion in the outer case 103. Fuel gas is supplied to the combustion unit 101 from a gas supply pipe, not shown. The combustion gas generated in the combustion unit 101 heats the heat exchange unit 102, and is discharged to the outside through the inner casing 104.

The combustion unit 101 is ignited when the hot water supply device 100 performs a hot water supply operation. Water supplied from the water inlet pipe 105 to the heat exchanger 102 is heated by heat exchange with the combustion gas, and hot water is discharged from the hot water outlet pipe 106. The blower 2 starts operation at the same time as the hot water supply operation is started, and the blower 2 discharges the combustion gas, which has been used for heat exchange and has a reduced temperature, to the outside. Therefore, the high-temperature combustion gas generated in the combustion unit 101 is appropriately supplied to the heat exchanger 102.

The blower 2 is disposed downstream of the heat exchanger 102 from the combustor 101. The blower 2 sucks in the combustion gas having passed through the heat exchange unit 102 by driving the motor 1, and discharges the combustion gas from the exhaust port 2a to the outside of the outer case 103. In fig. 1, the flow of combustion gas is shown by the dashed arrows. The temperature of the discharged combustion gas is, for example, about 200 ℃, which is much higher than the normal temperature. In the present embodiment, the blower 2 is a centrifugal fan capable of improving durability in a high-temperature environment.

The heat exchange portion 102 exchanges heat between the combustion gas and the heat medium. In the present embodiment, the heat medium is water. The heat exchange portion 102 is disposed downstream of the combustion portion 101. Specifically, the heat exchange portion 102 includes heat transfer tubes and fins, not shown. One side of the heat transfer pipe is connected to the inlet pipe 105, and the other side of the heat transfer pipe is connected to the outlet pipe 106. The fins are disposed around the heat transfer pipe and absorb heat from the combustion gas. The heat absorbed by the fins is transferred to the heat medium flowing in the heat transfer pipe. The heat exchanger 102 exchanges heat between the high-temperature combustion gas generated by the combustion operation of the combustor 101 and water supplied from the water inlet pipe 105. The water heated by the heat exchanger 102 is discharged from the hot water outlet pipe 106.

The blower 2 of the present embodiment can discharge high-temperature combustion gas sucked from the inside of the inner case 104 to the outside. Since the blower 2 includes the accessory member 25 described later, the heat transfer from the combustion gas to the motor 1 can be suppressed. In the present embodiment, since the member for fixing the attachment member 25 is disposed at a position where the air flow can be suppressed from being obstructed, a decrease in air blowing efficiency can be suppressed. That is, the hot water supply device 100 of the present embodiment can improve durability and suppress a decrease in exhaust efficiency.

< 2. blower and Motor

Fig. 2 is a perspective view of the air blower 2 according to the embodiment of the present invention. Fig. 3 is a longitudinal sectional view of the air blower 2 according to the embodiment of the present invention. As shown in fig. 2 and 3, the blower 2 includes a motor 1, an impeller 21, an impeller housing 22, and an attachment member 25.

Fig. 4 is a perspective view of the motor 1 according to the embodiment of the present invention. Fig. 5 is a longitudinal sectional view of the motor 1 according to the embodiment of the present invention. As shown in fig. 4 and 5, the motor 1 includes a rotor 12, a stator 13, and a motor housing 16. In other words, the blower 2 includes the rotor 12, the stator 13, the motor housing 16, the impeller 21, the impeller housing 22, and the attachment member 25. The motor 1 also has a bearing 14.

The rotor 12 has a shaft 11. The shaft 11 is disposed along a central axis C extending vertically. The shaft 11 is a columnar member made of metal, for example. However, the shaft 11 may have a different shape such as a cylindrical shape. The shaft 11 may be made of a material other than metal.

The rotor 12 rotates about a central axis C. In the present embodiment, the rotor 12 further includes a cylindrical rotor magnet 121 extending in the axial direction. The rotor magnet 121 is disposed radially outward of the shaft 11 and fixed to the shaft 11. The rotor magnet 121 may be directly fixed to the shaft 11 or may be indirectly fixed thereto. In the present embodiment, the shaft 11 is press-fitted to the rotor magnet 121, and the rotor magnet 121 is directly fixed to the shaft 11. On the radially outer surface of the rotor magnet 121, N poles and S poles are alternately arranged in the circumferential direction. The rotor magnet 121 may be constituted by 1 magnet or a plurality of magnet pieces. Instead of the rotor magnet 121, the rotor 12 may have a structure including a rotor core that is a magnetic body and a plurality of magnet pieces held by the rotor core, for example.

The stator 13 is radially opposed to the rotor 12. In the present embodiment, the stator 13 is disposed radially outward of the rotor 12. The stator 13 is an armature that generates magnetic flux in accordance with a drive current. The stator 13 has a stator core, an insulator, and a coil. The stator core is a magnetic body. The stator core is formed by laminating electromagnetic steel sheets, for example. The stator core has an annular core back and a plurality of teeth. The plurality of teeth protrude from the core back toward the radially inner side. The plurality of teeth are radially opposed to the radially outer surface of the rotor 12. The insulator is an insulator. The material of the insulating member is, for example, resin. The insulator may be molded in a state where the stator core is housed as an insert member in a mold in advance. Further, the insulator may be formed on the surface of the stator core by powder coating. The insulator covers at least a portion of the stator core. The coil is formed by winding a conductive wire around a tooth with an insulator interposed therebetween. By supplying a driving current to the coil, a rotational torque is generated between the rotor 12 and the stator 13. Thereby, the rotor 12 rotates relative to the stator 13.

The motor 1 of the present embodiment is an inner rotor type motor in which a rotor 12 is disposed radially inside a stator 13. However, the motor 1 may be an outer rotor type motor in which the rotor 12 is disposed radially outside the stator 13.

The bearing 14 rotatably supports the shaft 11. In the present embodiment, the bearing 14 is a ball bearing having an inner race and an outer race. The shaft 11 is fixed to the inner race of the bearing 14. The outer race of the bearing 14 is fixed to the motor housing 16. In the present embodiment, the motor 1 has two bearings 14. One bearing 14 is disposed axially above the rotor magnet 121. The other bearing 14 is disposed axially below the rotor magnet 121. The number and type of the bearings 14 may be changed according to the structure of the present embodiment.

The motor housing 16 surrounds the rotor 12 and the stator 13. In detail, the motor housing 16 includes a housing main body 161 and a housing cover 162. The case body 161 has a cylindrical shape with a lid that opens axially downward. The rotor 12 and the stator 13 are housed in the case body 161. An upper recess 1611 recessed upward in the axial direction is provided in the center of the upper wall of the case main body 161. The upper recess 1611 accommodates a bearing 14, and the bearing 14 is disposed axially above the rotor 12. A flange 1612 is provided at the lower end of the case body 161 to project radially outward.

The housing cover 162 has a circular plate shape. The case cover 162 is disposed below the case body 161 and surrounds an opening of the case body 161. The outer edge of the housing cover 162 is fixed to the flange portion 1612. Housing cover 162 is secured by caulking to flange 1612. The housing cover 162 may be fixed to the flange portion 1612 using a fixing member such as a screw. A bearing housing 1621 is provided at the center of the housing cover 162 so as to be recessed axially downward. The bearing housing 1621 houses a bearing 14, and the bearing 14 is disposed axially below the rotor magnet 121. In other words, the motor housing 16 includes a bearing housing 1621 that houses the bearing 14, and the bearing 14 projects axially downward at a lower end thereof and is disposed axially downward of the rotor magnet 121.

A shaft hole 1622 penetrating in the axial direction is provided in a bottom wall of the bearing housing 1621 at a lower portion in the axial direction. The shaft 11 passes through the shaft hole 1622 and protrudes axially downward from the lower end of the motor housing 16.

As shown in fig. 3, the impeller 21 is attached to the shaft 11 at a position axially below the motor housing 16 and is rotatable about the center axis C. Specifically, the impeller 21 is attached to a lower end portion of the shaft 11.

The impeller 21 has an impeller base portion 211 and a plurality of impeller blades 212. The impeller 21 also has an impeller annular portion 213. The impeller base portion 211 is expanded in a direction intersecting the axial direction. In the present embodiment, the impeller base portion 211 has a disk shape and extends in a direction perpendicular to the axial direction. A shaft attachment hole 2111 penetrating in the axial direction is provided in the center of the impeller base portion 211. The lower end of the shaft 11 passes through the shaft mounting hole 2111, and the impeller 21 is fixed to the lower end of the shaft 11. Specifically, the impeller 21 is fixed to the shaft 11 using a nut 26 disposed axially below the impeller base portion 211.

The plurality of impeller blades 212 are arranged in the circumferential direction on the lower surface of the impeller base portion 211. Specifically, the plurality of impeller blades 212 are arranged at equal intervals in the circumferential direction. Each impeller blade 212 extends in an axial direction. The upper end portion of each impeller blade 212 is fixed to the impeller base portion 211. The impeller annular portion 213 is annular about the central axis C and is fixed to the lower end of each impeller blade 212. In the present embodiment, the radially inner end of the impeller annular portion 213 is located radially outward of the radially inner end of each impeller blade 212.

As shown in fig. 3, the impeller housing 22 surrounds the impeller 21. An impeller casing opening 221 that penetrates in the axial direction is provided on the lower surface of the impeller casing 22. In other words, the impeller housing 22 has a cylindrical shape with a cover that opens axially downward. A cover member having an air inlet not shown is attached to the impeller housing opening 221. The suction port is located radially inward of the impeller blades 212. A cover member having an air inlet is provided in the inner case 104, for example.

A shaft hole 222 is provided in an upper wall of the impeller housing 22 in an axial direction. The shaft 11 is partially disposed in the impeller housing 22 through the shaft hole 222. In the impeller housing 22, an impeller 21 is attached to the shaft 11. An air passage 23 is formed in the impeller housing 22 radially outside the impeller 21. The rotation of the impeller 21 causes air present at a position radially inward of the impeller blades 212 to be blown out to the air passage 23.

The impeller housing 22 is provided with an exhaust portion 24 communicating with the outside of the impeller housing 22. Specifically, the exhaust portion 24 is provided at the radially outer end of the impeller housing 22.

When the impeller 21 is rotated by driving the motor 1, high-temperature combustion gas is sucked into the radial direction inner side of the impeller 21 through an unillustrated inlet port provided in the inner housing 104. The high-temperature combustion gas sucked into the radial inner side of the impeller 21 is blown out to the radial outer side of the impeller 21 by the rotation of the impeller 21. The high-temperature combustion gas blown out from the impeller 21 passes through the air passage 23 and is discharged from the exhaust portion 24 to the outside of the hot water supply apparatus 100.

The fitting 25 connects the motor housing 16 and the impeller housing 22 with a gap therebetween in the axial direction. In the present embodiment, the number of the fitting parts 25 is 3. However, the number of the fitting parts 25 may be other than 3, for example, 1. For example, when the number of the fitting members 25 is 1, the fitting members 25 may be in the form of a ring or the like. By providing the attachment member 25, the motor housing 16 can be kept away from the impeller housing 22, which is affected by the high-temperature combustion gas and thus has a high temperature. Therefore, the components constituting the motor 1 can be suppressed from being affected by heat.

< 3. details about fitting parts >

Fig. 6 is an enlarged view of a portion surrounded by a broken-line frame F in fig. 3. As shown in fig. 6, the air blowing device 2 includes a 1 st fixing member 31 and a 2 nd fixing member 32. The 1 st fixing member 31 fixes the attachment member 25 and the impeller housing 22. The 2 nd fixing member 32 fixes the accessory member 25 and the motor housing 16.

In the present embodiment, the 1 st fixing member 31 is a screw having a main body portion BP with a thread extending in the axial direction. The 2 nd fixing member 32 is the same screw as the 1 st fixing member 31. That is, the 1 st fixing member 31 and the 2 nd fixing member 32 are screws having screw threads and extending in the axial direction of the main body portion BP. However, the 1 st fixing member 31 and the 2 nd fixing member 32 may be fixing members other than screws, and may be rivets or the like, for example.

At least a part of the 1 st fixing member 31 is disposed radially inward of the radially outer end of the wheel base 211. In the present embodiment, the 1 st fixing member 31 is disposed radially inward of the radially outer end of the wheel base 211. The 1 st fixing member 31 is disposed axially above the impeller base portion 211. A gap is provided between the 1 st fixing member 31 and the impeller base portion 211 in the axial direction.

According to the present embodiment, the 1 st fixing member 31 is not disposed in the air passage 23 formed radially outward of the impeller base portion 211. In addition, the 1 st fixing member 31 does not enter the inside of the impeller 21. Therefore, the 1 st fixing member 31 can be disposed at a position away from the main passage of the air formed in the impeller housing 22, and a decrease in the air blowing efficiency of the air blowing device 2 can be suppressed.

In the present embodiment, the lower end of the 1 st fixing member 31 protrudes axially downward from the lower surface of the upper wall of the impeller housing 22. Thus, for example, when the upper wall of the impeller housing 22 is thin, the attachment member 25 and the impeller housing 22 can be fixed using the 1 st fixing member 31 without complicating the fixing structure. Even if the 1 st fixing member 31 protrudes into the impeller housing 22, the protruding position is located at a position deviated from the main passage of air in the impeller housing 22, and therefore, a decrease in air blowing efficiency of the air blowing device 2 can be suppressed.

However, the lower end of the 1 st fixing member 31 may not protrude axially downward from the lower surface of the upper wall of the impeller housing 22. For example, the following structure can be adopted: the impeller casing 22 is flanged so as to form a portion standing upward in the axial direction, whereby the lower end of the 1 st fixing member 31 does not protrude axially downward beyond the lower surface of the upper wall of the impeller casing 22. In this case, a recess that is recessed upward in the axial direction is formed in the impeller housing 22. However, since the recess is formed at a position deviated from the main passage of the air in the impeller housing, the reduction of the air blowing efficiency of the air blowing device 2 can be suppressed.

Fig. 7 is a perspective view of the accessory part 25 according to the embodiment of the present invention. As shown in fig. 7, accessory part 25 has 1 st arm 251, connecting portion 252, and 2 nd arm 253. In detail, as shown in fig. 6, the 1 st arm portion 251 extends in a radial direction. The connecting portion 252 extends axially upward from a radially outer end portion of the 1 st arm portion 251. The 2 nd arm 253 extends radially inward from the upper end of the connecting portion 252. Specifically, the 1 st arm 251 extends radially inward from the lower end of the connecting portion 252. That is, the attachment member 25 has a substantially C-shape. The lower surface of the 1 st arm 251 is disposed to face the upper surface of the impeller housing 22. The upper surface of the 2 nd arm 253 is disposed to face the lower surface of the housing cover 162.

For example, if the attachment member 25 is formed in a substantially C-shape when the attachment position of the attachment member 25 to the impeller housing 22 and the motor housing 16 is assumed to overlap in the axial direction, the overall length of the attachment member 25 can be increased while suppressing the overall length of the connection portion 252 from being increased as compared with, for example, the case where the attachment member 25 is formed in a substantially Z-shape. This can increase the heat radiation area of the attachment member 25, and thus can reduce the amount of heat transferred from the impeller housing 22 to the motor housing 16 via the attachment member 25.

As shown in fig. 7, the 1 st arm portion 251 is provided with a 1 st screw hole 2511 that penetrates in the axial direction. Specifically, a spiral groove that enables the 1 st fixing member 31 to be screwed is provided on the inner peripheral surface of the 1 st screw hole 2511. As shown in fig. 6, a 1 st screw fastening hole 223 that penetrates in the axial direction and through which the body BP of the 1 st fixing member 31 passes is provided in the upper wall of the impeller housing 22. The 1 st fixing member 31 is disposed such that the body BP faces upward and the head HP faces downward. The 1 st fixing member 31 fixes the attachment member 25 and the impeller housing 22 so that the body portion BP passes through the 1 st screw fastening hole 223 and the 1 st screw hole 2511 in this order from the lower side toward the upper side of the shaft. The head HP of the screw is disposed on the lower surface side of the upper wall of the impeller housing 22. That is, the head HP of the screw is disposed inside the impeller housing 22.

As shown in fig. 3, an impeller casing opening 221 that penetrates in the axial direction is provided in the bottom wall of the impeller casing 22. The head HP of the screw is disposed radially inward of the inner wall of the impeller housing opening 221. Accordingly, the 1 st fixing member 31 can be visually confirmed when viewed from the impeller housing opening portion side, and therefore, the coupling state of the 1 st fixing member 31 can be easily confirmed when the blower device 2 is manufactured. Further, when the 1 st fixing member 31 is fixed from the axial lower side, interference between the fixing tool and the inner wall of the impeller housing opening 221 can be suppressed, and therefore, assembly of the air blower 2 is facilitated.

As shown in fig. 7, the 2 nd arm 253 is provided with a 2 nd screw hole 2531 penetrating in the axial direction. Specifically, a spiral groove that enables the 2 nd fixing member 32 to be screwed is provided in the inner peripheral surface of the 2 nd screw hole 2531. As shown in fig. 4, a cover protruding portion 1623 that protrudes radially outward is provided on the outer edge of the housing cover 162. The cover projection 1623 is provided with a 2 nd screw fastening hole 1624 penetrating in the axial direction. The 2 nd screw fastening hole 1624 is through which the main body portion BP of the 2 nd fixing member 32 passes. The 2 nd fixing member 32 is disposed such that the body BP of the screw faces downward and the head HP faces upward. The 2 nd fixing member 32 fixes the attachment member 25 and the housing cover 162 so that the body portion BP passes through the 2 nd screw fastening hole 1624 and the 2 nd screw hole 2531 in this order from the axial upper side toward the lower side. In addition, the 1 st or 2 nd screw hole 2511 or 2531 may be formed with a tapping screw as the 1 st or 2 nd fixing member 31 or 32 without forming a groove.

The impeller housing 22 is provided with the 1 st screw fastening holes 223 in the same number as the number of the fitting members 25. The case cover 162 is provided with the same number of 2 nd screw fastening holes 1624 as the number of the fitting members 25. In the present embodiment, the number of the fitting members 25 is 3, and the number of the 1 st screwing hole 223 and the number of the 2 nd screwing holes 1624 are 3, respectively.

Further, the following structure may be adopted: the 2 nd fixing member 32 fixes not only the housing cover 162 but also the housing cover 162 and the flange portion 1612 to the attachment member 25. In the case of such a configuration, the 2 nd arm 253 may be extended in the radial direction to shift the position of the 2 nd screw hole 2531 radially inward. Further, for example, by forming the flange portion 1612 in the same shape as the cover protruding portion 1623, the housing cover 162, the flange portion 1612, and the attachment member 25 can be fastened together.

In the present embodiment, the plurality of metal fittings 25 are arranged at equal intervals in the circumferential direction. In other words, the plurality of fitting members 25 are arranged at equal intervals in the circumferential direction. Specifically, the number of the fitting members 25 is 3, and the 3 fitting members 25 are arranged with 120 ° in the circumferential direction.

According to the configuration of the present embodiment, the motor housing 16 can be supported in a well-balanced manner with respect to the impeller housing 22. According to the structure of the present embodiment, the heat transferred from the impeller housing 22 to the motor housing 16 via the attachment member 25 can be prevented from being unevenly transferred to a specific portion of the motor housing 16.

In the present embodiment, the 2 nd fixing member 32 and the 1 st fixing member 31 are arranged at the same position in the circumferential direction. That is, the 1 st screw hole 2511 and the 2 nd screw hole 2531 provided in the attachment member 25 have the same circumferential position. The 1 st screwing hole 223 to which the same attachment member 25 is attached and the 2 nd screwing hole 1624 are located at the same circumferential position. The 31 st screw fastening holes 223 are arranged at intervals of 120 ° in the circumferential direction on the upper wall of the impeller housing 22. The 3 nd 2 nd screwing holes 1624 are arranged at intervals of 120 ° in the circumferential direction on the housing cover 162.

According to the configuration of the present embodiment, the position where the attachment member 25 and the impeller housing 22 are fixed is the same as the circumferential position where the attachment member 25 and the motor housing 16 are fixed. Therefore, when the attachment member 25 is fixed at two places by the 1 st fixing member 31 and the 2 nd fixing member 32, it is possible to suppress the occurrence of unnecessary moment in the attachment member 25. Further, the circumferential positions of the 1 st fixing member 31 and the 2 nd fixing member 32 may be slightly shifted within a range in which a large unnecessary moment is not generated. That is, the circumferential positions of the 1 st fixing member 31 and the 2 nd fixing member 32 may not be completely the same.

In the present embodiment, the 1 st fixing member 31 and the 2 nd fixing member 32 are disposed at different positions in the radial direction. Specifically, the 1 st fixing member 31 is disposed radially inward of the 2 nd fixing member 32. According to the configuration of the present embodiment, since the position where the 1 st fixing member 31 is attached is radially offset from the position where the 2 nd fixing member 32 is attached, for example, even when the gap between the motor housing 16 and the impeller housing 22 in the axial direction is small, the 1 st fixing member 31 and the 2 nd fixing member 32 can be arranged at an appropriate distance from each other.

For example, as shown in fig. 2 and the like, the rotary blade 15 fixed to the shaft 11 is disposed radially inside the attachment member 25. The rotary blades 15 are disposed between the motor casing 16 and the impeller casing 22 in the axial direction. The rotary blades 15 rotate about the central axis C together with the shaft 11.

Fig. 8 is a perspective view of the rotary blade 15 according to the embodiment of the present invention. The rotary blade 15 has a blade 151 and a flat plate portion 152. The flat plate portion 152 expands in a direction perpendicular to the axial direction. The blades 151 project upward in the axial direction from the upper surface of the flat plate portion 152. The flat plate portion 152 has a circular shape and has a plurality of through holes 1524 penetrating in the axial direction. The through holes 1524 are arranged at equal intervals in the circumferential direction. A rotary blade insertion portion 1521 that penetrates in the axial direction and through which the shaft 11 passes is provided at the center portion of the flat plate portion 152. The shaft 11 is press-fitted into the rotary blade insertion portion 1521.

The plurality of blades 151 are arranged at equal intervals in the circumferential direction. Specifically, each of the blades 151 has a flat plate shape extending in the radial direction. However, each blade 151 may have another shape such as a curved shape extending in a direction including a radial component. Each blade 151 may have, for example, a flat plate shape extending in a direction perpendicular to the radial direction.

In the present embodiment, the blade 151 and the flat plate portion 152 are the same member. The blade 151 is formed by cutting a part of a flat plate constituting the flat plate portion 152. The through hole 1524 is formed along with the cutting of the blade 151. The number of parts can be reduced by forming the blade 151 and the flat plate portion 152 as the same member. However, the blade 151 and the flat plate portion 152 may be separate members, and in this case, the through hole 1524 may not be provided.

The airflow is generated by rotating the rotary blades 15 together with the shaft 11. The fitting part 25 can be cooled by the airflow generated by the rotation of the rotary blade 15. The rotary blade 15 is preferably made of a material having a high thermal conductivity. The rotary blade 15 is preferably made of metal such as aluminum. With such a configuration, the rotary blade 15 can function as a radiator.

< 4. Note > (R)

Various features of the various techniques disclosed in the present specification can be modified in various ways without departing from the gist of the technical creation. In addition, a plurality of embodiments and modifications described in the present specification may be combined and implemented as far as possible.

Fig. 9 is a diagram showing a modification of the air blower 2 according to the embodiment of the present invention. As shown in fig. 9, the 1 st fixing member 31A formed of a screw may have a configuration in which a head HP of the screw is disposed above the body BP. That is, the 1 st fixing member 31A may be arranged such that the head HP of the screw is positioned on the upper side and the body BP is positioned on the lower side. In this case, the spiral groove for screwing the 1 st fixing member 31A may be provided not in the inner periphery of the 1 st screw hole 2511A but in the inner periphery of the 1 st screw hole 223A, the 1 st screw hole 2511A being provided in the attachment member 25A, and the 1 st screw hole 223A being provided in the impeller casing 22A. In the 1 st fixing member 31A, at least the body portion BP protruding into the impeller housing 22A may be disposed radially inward of the radially outer end of the impeller base portion 211. A part of the head portion HP of the 1 st fixing member 31A may be disposed radially outward of the radially outer end of the wheel base portion 211.

As shown in fig. 9, the 2 nd fixing member 32A formed of a screw is also preferably configured such that the head HP of the screw is disposed above the body BP. This enables the 1 st fixing member 31A and the 2 nd fixing member 32A to be attached from the same direction as the impeller housing 22A, thereby improving the work efficiency. For example, the impeller housing 22A and the attachment member 25A are fixed by disposing the 1 st fixing member 31A on the impeller housing 22A and attaching the 1 st fixing member 31A from above. Next, the motor housing 16 is disposed on the attachment member 25A without turning over the impeller housing 22A. The accessory member 25A and the motor case 16A are fixed by attaching the 2 nd fixing member 32A from above. That is, the 1 st fixing member 31A and the 2 nd fixing member 32A can be attached from above, and the air blower 2 can be efficiently assembled.

Industrial applicability

The air supply device of the present invention can be used for a hot water supply device, a cooking range, or the like.

Claims (10)

1. An air supply device, characterized in that the air supply device comprises:

a rotor having a shaft disposed along a central axis extending in an up-down direction;

a stator that is radially opposed to the rotor;

a motor housing surrounding the rotor and the stator;

an impeller attached to the shaft at a position axially below the motor housing and rotatable about the central axis;

an impeller housing surrounding the impeller; and

a fitting member that connects the motor housing and the impeller housing with a gap therebetween in an axial direction,

the impeller has:

an impeller base portion that extends in a direction intersecting the axial direction; and

a plurality of impeller blades arranged in a circumferential direction on a lower surface of the impeller base portion,

at least a part of the 1 st fixing member that fixes the attachment member and the impeller housing is disposed radially inward of a radially outer end of the impeller base portion.

2. The air supply arrangement according to claim 1,

the lower end of the 1 st fixing member protrudes downward from the lower surface of the upper wall of the impeller housing.

3. The air supply arrangement according to claim 1,

the fitting member is arranged in plurality at equal intervals in the circumferential direction.

4. The air supply arrangement according to claim 1,

the fitting part has:

a 1 st arm portion extending in a radial direction;

a connecting portion extending upward in an axial direction from a radially outer end portion of the 1 st arm portion; and

and a 2 nd arm portion extending radially inward from an upper end portion of the connecting portion.

5. The air supply arrangement according to claim 1,

a rotary blade fixed to the shaft is disposed radially inward of the fitting member.

6. The air supply arrangement according to claim 1,

the 2 nd fixing member that fixes the accessory member and the motor housing is arranged at the same position in the circumferential direction as the 1 st fixing member.

7. The air supply arrangement of claim 6,

the 1 st fixing member and the 2 nd fixing member are screws having screw threads and extending in the axial direction of a main body portion,

the 1 st fixing member and the 2 nd fixing member are disposed at different positions in a radial direction.

8. The air supply apparatus according to any one of claims 1 to 6,

the 1 st fixing member is a screw having a main body portion with a thread extending in an axial direction,

the head of the screw is disposed inside the impeller housing,

the bottom wall of the impeller shell is provided with an impeller shell opening part which penetrates along the axial direction,

the head of the screw is disposed radially inward of the inner wall of the impeller housing opening.

9. The air supply apparatus according to any one of claims 1 to 6,

the 1 st fixing member is a screw having a main body portion with a thread extending in an axial direction,

the head of the screw is disposed above the body.

10. A hot water supply device, comprising:

a combustion unit that generates combustion gas;

a heat exchange unit that exchanges heat between the combustion gas and a heat medium; and

the air supply device of any one of claims 1 to 9.

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