JP6786823B2 - Centrifugal fluid machine, centrifugal blower and centrifugal compressor - Google Patents

Description

The present invention relates to a centrifugal fluid machine, a centrifugal blower, and a centrifugal compressor that can cool an internal heat generating component.

Centrifugal blowers and compressors use a motor to rotate the impeller at high speed, and the rotation of the impeller sucks in the mainstream and exhausts it to the outside. The motor generates heat while the blower or compressor is operating. When the temperature of the motor rises, the rotational efficiency of the motor decreases, the operating efficiency of the blower and compressor decreases, and the materials of the parts are also limited, so it is necessary to cool the motor.

Conventionally, as a means for cooling a motor, for example, a mainstream or a part of the mainstream is used as cooling air. In the conventional means, in the process of sucking the mainstream by rotating the impeller and exhausting it to the outside, the mainstream or a part of the mainstream is circulated around the motor to cool the motor.

In Patent Document 1, air is taken in from the air guide port of the fan case, and the air is sent from the diffuser to the inside of the motor case while being guided to the blade portion of the fan, and is around the insulating slot of the rotor core of the motor. The configuration is disclosed in which the motor case is exhausted to the outside after being cooled through the motor case.

Japanese Unexamined Patent Publication No. 2000-236639

However, when using a part of the mainstream or mainstream as cooling air, the mainstream itself must be at a temperature that can cool the motor such as outside air, and when the temperature of the mainstream is high, part of the mainstream or mainstream is used as cooling air. Could not be used.

The present invention provides a centrifugal fluid machine, a centrifugal blower, and a centrifugal compressor having a structure for sucking outside air as cooling air separately from the mainstream.

In the present invention, the impeller pivotally attached to the rotating shaft, the cooling fan axially attached to the rotating shaft and provided on the back side of the impeller, and the impeller and the cooling fan integrally rotate via the rotating shaft. A rotary drive unit to be driven, an impeller housing for accommodating the impeller, and a motor housing connected to the impeller housing and accommodating the rotary drive unit are provided, and an intake port and an exhaust port are formed in the motor housing. The present invention relates to a centrifugal fluid machine in which a cooling flow path is formed so that outside air is sucked from the intake port by a cooling fan, the outside air flows through the motor housing, and is exhausted from the exhaust port.

The present invention also relates to a centrifugal fluid machine in which a flow path forming plate for forming the exhaust port is provided at one end of the motor housing with the rotating shaft, and the cooling fan is provided at the exhaust port. Is.

Furthermore, in the present invention, an exhaust flow path is formed between the flow path forming plate and the impeller housing, and the outside air in the motor housing is deflected to the flow path forming plate and from the exhaust port to the cooling fan. It relates to a centrifugal fluid machine that is sucked in and exhausted to the outside through the exhaust flow path.

According to the present invention, even when the mainstream used is at a high temperature, the rotary drive unit can be cooled, so that a decrease in the rotational efficiency of the rotary drive unit can be suppressed, and the operation efficiency can be improved. , It exerts an excellent effect that the degree of freedom of the material of the parts can be increased.

It is a vertical sectional view which shows the blower which concerns on embodiment of this invention. (A) is a front view showing a flow path forming plate according to an embodiment of the present invention, (B) shows an arrow view of AA of (A), and (C) is an enlargement of a main part of (B). The figure is shown. (A) is a front view which shows the cooling fan which concerns on embodiment of this invention, (B) shows the BB arrow view of (A).

Hereinafter, examples of the present invention will be described with reference to the drawings.

First, the centrifugal fluid machine according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. In FIG. 1, the left side with respect to the paper surface is the tip end side, and the right side with respect to the paper surface is the base end side. Further, in this embodiment, a centrifugal blower will be described as an example.

The blower 1 has an impeller housing 3 in which an impeller 2 is housed, and a motor housing 5 in which an electromagnetic coil 4 which is a rotation drive unit for rotating the impeller 2 is housed.

The motor housing 5 has a cylindrical motor housing main body 6, and heat radiation fins 7 are formed on the peripheral surface of the motor housing main body 6. Further, for example, a stainless steel rotating shaft 8 is inserted into the motor housing main body 6 concentrically with the motor housing 5.

A rotor 8a is formed on the rotating shaft 8, and the electromagnetic coil 4 is provided so as to surround the rotor 8a with a slight gap. By energizing the electromagnetic coil 4 via wiring (not shown), a rotating magnetic field is generated between the electromagnetic coil 4 and the rotor 8a, and the rotor 8a is rotated.

A gap is formed between the electromagnetic coil 4 and the rotor 8a and between the electromagnetic coil 4 and the inner peripheral surface of the motor housing main body 6 to the extent that rotation is not hindered. Further, on the inner peripheral surface of the motor housing main body 6, grooves 9 formed over the entire length in the axial direction are formed over the entire circumference at a predetermined angle pitch, for example, a 60 ° pitch.

A bearing portion 11 on the proximal end side is provided at a portion of the rotary shaft 8 protruding toward the proximal end side from the rotor 8a, and the rotary shaft 8 is rotatably supported by the bearing portion 11 on the proximal end side. The base end side bearing portion 11 has a flange portion 11a protruding in the radial direction, and is fixed to the base end side bearing plate 12 described later with a bolt or the like via the flange portion 11a to obtain the base end side bearing. The axial and radial displacements of the portion 11 are constrained.

The base end side bearing plate 12 is fixed to the base end portion of the motor housing main body 6 with bolts or the like. Further, a plurality of intake ports 14 are formed on the base end side bearing plate 12 at a predetermined angle pitch. The outside and the inside of the motor housing main body 6 are communicated with each other through the intake port 14. The intake port 14 may be provided with a filter (not shown) such as a dustproof filter so that foreign matter does not enter the inside of the motor housing main body 6 from the outside.

A tip-side bearing portion 18 is provided at a portion of the rotary shaft 8 projecting toward the tip end side from the rotor 8a, and the rotary shaft 8 is rotatably supported by the tip-side bearing portion 18. The tip-side bearing portion 18 has a flange portion 18a protruding in the radial direction, and is fixed to the tip-side bearing plate 19 described later by a bolt or the like via the flange portion 18a to form the tip-side bearing portion 18. Axial and radial displacements are constrained.

The tip-side bearing plate 19 is fixed to the tip of the motor housing main body 6 with bolts or the like. Further, a flow path forming plate 23, which is a first plate, as shown in FIG. 2A, is bolted to the tip side of the tip portion of the motor housing main body 6 further than the tip side bearing plate 19. It is fixed by such as. A space 24 having a predetermined interval is formed between the tip side bearing plate 19 and the flow path forming plate 23.

The motor housing 5 is composed of the motor housing main body 6, the base end side bearing plate 12, the tip end side bearing plate 19, the flow path forming plate 23, and the like.

The rotary shaft 8 is rotatably supported by the tip end side bearing portion 18 and the base end side bearing portion 11, and axial and radial displacements are constrained.

A plurality of distribution ports 20 are formed around the tip side bearing plate 19 at a predetermined angle pitch. The inside of the motor housing main body 6 and the space 24 are communicated with each other through the distribution port 20.

As shown in FIGS. 2B and 2C, the flow path forming plate 23 has a disc shape with a hole formed in the center thereof. The diameter of the hole is larger than the diameter of the rotating shaft 8, and when the flow path forming plate 23 is attached to the motor housing main body 6, the flow path forming plate 23 and the rotating shaft 8 A ring-shaped exhaust port 25 is formed between the two. A cooling flow path from the intake port 14 to the exhaust port 25 is formed in the motor housing 5 by the groove 9, the space 24, and the like.

The impeller housing 3 has an impeller housing main body 26 and a substantially disk-shaped closing plate 27 which is a second plate and has a hole in the center.

The impeller housing main body 26 and the closing plate 27 are fixed to each other by holding an airtight member 28 such as an O-ring with a bolt or the like. By being fixed to the closing plate 27, the base end surface of the impeller housing main body 26 is closed, and a flow path of a main stream 32 that is sucked and exhausted by the impeller 2 such as a diffuser 29 and a scroll 31 is formed inside. Will be done. Further, the rotating shaft 8 penetrates the hole of the closing plate 27 and extends to the impeller housing 3.

The closing plate 27 is formed with a screw seat portion (not shown) that protrudes toward the proximal end side at a predetermined angular pitch and an inclined portion 27a that inclines toward the proximal end side at the outer peripheral edge portion. .. The closing plate 27 and the motor housing main body 6 are fixed to each other with bolts or the like via the screw seat portion, or the flow path forming plate 23 is sandwiched between the screw seat portion and the motor housing main body portion 6. In this state, the closing plate 27 and the motor housing main body 6 are fixed with bolts or the like. The impeller housing 3 and the motor housing 5 are connected with the closing plate 27 interposed therebetween.

At this time, an exhaust flow path 33 is formed between the flow path forming plate 23 and the closing plate 27. The exhaust flow path 33 communicates with the inside of the motor housing 5 via the exhaust port 25 and also communicates with the outside of the blower 1.

A tip side middle diameter portion 8d is formed on the tip side of the rotating shaft 8 with respect to the flow path forming plate 23, and for example, an aluminum cooling fan 34 is fitted and shaft-mounted on the tip side middle diameter portion 8d. There is. Further, a tip side small diameter portion 8e is formed on the tip side of the tip side middle diameter portion 8d, and the impeller 2 made of aluminum, for example, is fitted and pivotally attached to the tip side small diameter portion 8e.

A boss portion 2a projecting from the base end side, that is, toward the back surface is formed in the central portion of the impeller 2, and the boss portion 2a penetrates the closing plate 27. The length of the boss portion 2a in the axial direction is substantially the same as or slightly longer than the length of the hole of the closing plate 27 in the axial direction.

The cooling fan 34 is provided in the exhaust flow path 33, that is, facing the exhaust port 25, and the diameter of the cooling fan 34 is larger than the diameter of the exhaust port 25.

Further, as shown in FIGS. 3A and 3B, a plurality of cooling fans 34, for example, 10 cooling fans 34 are provided on the surface of the bottom plate 35 (the side surface of the base end in FIG. 1) at a predetermined angle pitch. It is an impeller provided with blades 36, and is designed to exhaust the fluid sucked from the central portion in the outer diameter direction. Further, in the central portion of the bottom plate 35, a columnar boss portion 35a protruding toward the fluid suction side, that is, the proximal end side is formed, and the boss portion 35a fits with the tip side middle diameter portion 8d. .. Therefore, the cooling fan 34, the impeller 2, and the rotating shaft 8 rotate integrally.

At this time, the cooling fan 34 is in close contact with the back surface of the impeller 2, but a gap is formed between the impeller 2 and the cooling fan 34 by the boss portion 2a, and the closing plate 27 is positioned in the gap. Then, the impeller 2 and the cooling fan 34 are partitioned by the closing plate 27.

Next, the operation of the blower 1 will be described.

When electric power is supplied to the electromagnetic coil 4 from a wiring (not shown), a rotating magnetic field is generated between the electromagnetic coil 4 and the rotor 8a of the rotating shaft 8, and the rotating shaft 8 rotates at high speed.

The rotation of the rotating shaft 8 causes the impeller 2 to rotate integrally, and the rotation of the impeller 2 causes the mainstream 32 to be sucked into the impeller housing 3. The mainstream 32 is, for example, about 90 ° C., and the mainstream 32 sucked into the impeller housing 3 is blown to a predetermined blown object via the diffuser 29 and the scroll 31.

Further, the rotation of the rotating shaft 8 causes the cooling fan 34 to rotate integrally. The inside of the motor housing 5 is sucked from the exhaust port 25 by the rotation of the cooling fan 34. The inside of the motor housing 5 becomes a negative pressure, and the outside air is sucked into the motor housing 5 as cooling air 38 through the intake port 14.

The cooling air 38 sucked from the intake port 14 flows through the groove 9 formed on the inner peripheral surface of the motor housing main body 6, and a part of the cooling air 38 is between the electromagnetic coil 4 and the rotor 8a. To circulate.

When the cooling air 38 flowing through the motor housing main body 6 reaches the space 24 through the flow port 20, it is deflected toward the center by the flow path forming plate 23. The cooling air 38 deflected toward the center is exhausted from the exhaust port 25 to the outside of the motor housing 5.

The cooling air 38 exhausted from the exhaust port 25 and sucked into the cooling fan 34 is exhausted in the outer diameter direction, flows through the exhaust flow path 33, and is guided by the inclined portion 27a to the outside of the blower 1. It is exhausted to.

During the operation of the blower 1, the electromagnetic coil 4 generates heat, but the electromagnetic coil 4 is cooled by the cooling air 38 circulating in the motor housing main body 6, and further exchanges heat with the outside air by the heat radiation fin 7. It is cooled and can be cooled, for example, from 150 ° C to 100 ° C.

Further, the mainstream 32 sucked into the impeller housing 3 slightly flows into the exhaust flow path 33 from between the closing plate 27 and the impeller 2, but flows into the exhaust flow path 33. Since the mainstream 32 is exhausted to the outside of the blower 1 together with the cooling air 38 by the cooling fan 34, the cooling of the electromagnetic coil 4 is not hindered by the mainstream 32.

As described above, in the present embodiment, the motor housing 5 is provided with the intake port 14 and the exhaust port 25, and the cooling fan 34 rotated by the rotating shaft 8 blows outside air separately from the mainstream 32. The cooling air 38 is sucked into the motor housing 5, circulated, and exhausted.

Therefore, even when the mainstream 32 used in the blower 1 is at a high temperature, the electromagnetic coil 4 can be cooled, so that a decrease in the rotational efficiency of the electromagnetic coil 4 is suppressed, and the blower 1 is suppressed. Operation efficiency can be improved. Further, deterioration due to high temperature such as rust preventive used for the motor housing 5 and the like can be prevented, and the degree of freedom of the material of the parts can be increased.

Further, since the cooling fan 34 is provided on the rotating shaft 8 and rotates integrally with the impeller 2, it is not necessary to separately provide a motor for rotating the cooling fan 34, and the blower 1 It is possible to reduce the manufacturing cost of the device and reduce the size of the device.

Further, the flow path forming plate 23, which is a first plate, is provided between the impeller housing 3 and the motor housing 5, and an exhaust port 25 is provided between the flow path forming plate 23 and the rotating shaft 8. Since the cooling fan 34 is provided facing the exhaust port 25, the cooling air 38 can be reliably exhausted to the outside of the motor housing 5 without increasing the size of the cooling fan 34.

Further, the exhaust flow path 33 is formed between the flow path forming plate 23 and the closing plate 27 of the impeller housing 3, and the cooling air 38 sucked and discharged by the cooling fan 34 by the flow path forming plate 23. Channel is separated. Therefore, since the cooling air 38 sucked by the cooling fan 34 and the cooling air 38 exhausted do not interfere with each other, the exhaust efficiency of the cooling air 38 can be improved, and the electromagnetic coil 4 can be improved. Cooling efficiency can be improved.

Further, by forming the exhaust flow path 33, even when the high temperature mainstream 32 flows in from the impeller housing 3, the cooling fan 34 exhausts the air to the outside of the blower 1 together with the cooling air 38. , The mainstream 32 can be prevented from flowing into the motor housing 5.

In this embodiment, the cooling fan 34 is a centrifugal fan that sucks the cooling air 38 from the center and exhausts it in the outer diameter direction. However, the cooling fan 34 is a shaft provided in the exhaust port 25. It may be a flow fan, or another type of fan may be used.

Further, in this embodiment, the cooling structure of the electromagnetic coil 4 has been described by taking the blower 1 as an example, but it goes without saying that the cooling structure can also be applied to a centrifugal compressor.

1 Blower 2 Impeller 3 Impeller housing 4 Electromagnetic coil 5 Motor housing 8 Rotating shaft 14 Intake port 23 Flow path forming plate 24 Space 25 Exhaust port 32 Mainstream 33 Exhaust flow path 34 Cooling fan 38 Cooling air

Claims (8)

An impeller that is axially attached to a rotating shaft and has a boss portion that protrudes in the rear direction, and an impeller that is axially attached to the rotating shaft and adheres to the back surface side of the impeller via the boss portion to exhaust fluid in the outer radial direction. A cooling fan, a rotary drive unit that integrally rotates the impeller and the cooling fan via the rotary shaft, an impeller housing that houses the impeller, and a motor that is connected to the impeller housing and houses the rotary drive unit. A housing is provided, an intake port and an exhaust port are formed in the motor housing, and a flow path communicating with the exhaust port is formed between the impeller housing and the motor housing, and the flow path is described as described above. A centrifugal fluid machine in which a cooling fan is provided, and a cooling flow path is formed so that the outside air is sucked from the intake port by the cooling fan, the outside air flows through the motor housing, and is exhausted from the exhaust port. .. The centrifugal fluid machine according to claim 1, wherein the rotary drive unit includes an electromagnetic coil, and the electromagnetic coil is arranged with a gap between the electromagnetic coil and the motor housing. Centrifugal fluid machine according to claim 1 the flow path forming plate that forms the exhaust port provided et the between the rotary shaft at one end of the motor housing. An exhaust flow path is formed between the flow path forming plate and the impeller housing, and the outside air in the motor housing is deflected by the flow path forming plate, sucked into the cooling fan from the exhaust port, and the exhaust flow. The centrifugal fluid machine according to claim 3, which is exhausted to the outside through a path. A centrifugal blower to which the centrifugal fluid machine according to any one of claims 1 to 4 is applied. A centrifugal compressor to which the centrifugal fluid machine according to any one of claims 1 to 4 is applied. A rotating shaft, an impeller attached to the rotating shaft and formed with a boss portion protruding in the rear direction, a motor for rotationally driving the rotating shaft, a motor housing for accommodating the motor, and a motor housing formed on the motor housing. The cooling fan is provided with an intake port, a cooling flow path through which the refrigerant gas flows from the intake port to the downstream via the motor, and a cooling fan that sends out the refrigerant gas to the downstream side of the cooling flow path. A centrifugal fluid machine attached to the rotating shaft so as to be in close contact with the back surface side of the impeller via the boss portion . Connected downstream of the pre-Symbol cooling fan, the cooling channel and communicating, extends radially outward, it claims an exhaust passage having an inclined portion inclined toward the base end side outer peripheral edge 7 The centrifugal fluid machine described in.

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