WO2019235421A1

WO2019235421A1 - Blowing device and fluid control device

Info

Publication number: WO2019235421A1
Application number: PCT/JP2019/021976
Authority: WO
Inventors: 寛昭和田; 東山　祐三
Original assignee: 株式会社村田製作所
Priority date: 2018-06-05
Filing date: 2019-06-03
Publication date: 2019-12-12

Abstract

A fan case 40 for a fan unit 31 has an intake port 40a and a discharge port. A fan 50 is provided inside the fan case 40 and has: a holding plate 51 having a first surface 51a and being rotatably supported; and a plurality of blade members 53–55 provided upright on the first surface 51a of the holding plate 51. The blade members 53–55 extend from a center region of the holding plate 51 towards an end section on the outside of the holding plate 51, when viewed from the center axis direction of the fan 50. The fan unit 31 comprises a first flow path 71 that connects to the intake port 40a and is interposed between: an inside surface 42d of the fan case 40 facing the first surface 51a of the holding plate 51; the first surface 51a of the holding plate 51; and two adjacent blade members 53–55. The distance from the first surface 51a of the holding plate 51 to the inner surface 42d of the fan case 40 facing the first surface 51a reduces progressively towards an outer circumferential end section 51d of the holding plate 51.

Description

Blower, fluid control device

The present disclosure relates to a blower device and a fluid control device used, for example, for positive airway pressure (PAP).

Conventionally, as a treatment for sleep-related disorders such as obstructive sleep apnea syndrome (OSA), for example, a fluid control device such as a continuous positive airway pressure (CPAP) device (hereinafter, CPAP device) Is used. The CPAP device has a blower with a built-in fan, and supplies gas (for example, air) from a blower to a mask attached to a patient's mouth or nose at a pressure higher than atmospheric pressure. Since the CPAP device is used while the patient is sleeping, quietness is required. For example, a CPAP device having a mechanism for reducing the sound of air flowing into the device has been proposed (see, for example, Patent Document 1).

JP 2016-34411 A

By the way, the air blower used for the above-mentioned CPAP device or the like may generate a large noise due to the disturbance of the air flow in the fan unit, and the quietness may be lowered.
An object of the present disclosure is to provide a blower device and a fluid control device capable of suppressing disturbance of air flow.

An air blower according to an embodiment of the present disclosure includes a fan case having an intake port and a discharge port, a holding plate provided in the fan case and having a first surface and rotatably supported, and the first surface A fan having a plurality of blade members arranged in a rotating direction and sandwiched between two blade members adjacent to the inner surface of the fan case and the first surface of the holding plate, and the intake port A plurality of blade members extending from a central region of the holding plate toward an outer end portion of the holding plate when viewed from a central axis direction of the fan. The distance from the first surface of the plate to the inner surface of the fan case facing the first surface decreases from the outer peripheral end of the intake port toward the outer peripheral end of the holding plate.

According to this configuration, air flow disturbance can be suppressed and noise can be reduced.
A blower device according to another embodiment of the present disclosure includes a fan case having an intake port and a discharge port, a holding plate provided in the fan case and having a first surface and rotatably supported. A fan having a plurality of blade members standing on one surface and arranged in the rotational direction, and sandwiched between two blade members adjacent to the inner surface of the fan case and the first surface of the holding plate; A first flow path connected to the intake port, wherein the plurality of blade members are viewed from the central axis direction of the fan, from the central region of the holding plate toward the radially outer end direction of the holding plate The distance from the first surface of the holding plate to the inner surface of the fan case facing the first surface is greater than the distance at the outer peripheral end of the holding plate. Large, provided with a narrow portion in the middle of the first flow path, The distance in calamus, said distance is smaller than at the position adjacent to the narrow section.

According to this configuration, the backflow of air from the discharge port side end portion of the first flow path to the intake port side end portion is suppressed by the narrow portion, and a reduction in the performance of the blower can be suppressed.
The fluid control apparatus which is another one form of this indication has said air blower and the control apparatus which controls the said air blower.

According to this configuration, necessary air can be sent from the blower by the control device.

According to an embodiment of the present disclosure, it is possible to provide a blower device and a fluid control device that can suppress disturbance of air flow.

The schematic perspective view of a fluid control apparatus. Explanatory drawing of the use condition of a fluid control apparatus. The disassembled perspective view of a fluid control apparatus. The schematic plan view of the fluid control apparatus except the upper cover and the middle cover. The schematic perspective view of a fan unit. The exploded perspective view of a fan unit. The top view of a fan. The partial cross section figure of a fluid control apparatus. The partial expanded sectional view of a fan unit. The partial expanded sectional view of a fan unit. The partial expanded sectional view of the fluid control apparatus of the example of a change. Explanatory drawing which shows a radial direction position-channel height characteristic. Explanatory drawing which shows radial direction position-cross-sectional area characteristic. Explanatory drawing which shows a pressure-sound pressure level characteristic.

Hereinafter, an embodiment will be described.
In the accompanying drawings, components may be shown in an enlarged manner for easy understanding. The dimensional ratios of the components may be different from the actual ones or in other drawings. Further, in the cross-sectional view, some components may not be hatched for easy understanding.

As shown in FIG. 1, the fluid control device 1 has a rectangular parallelepiped case 10. A suction panel 11 is attached to one side surface 10 a of the case 10. The case 10 has an exhaust port 12 on the side surface 10a. The suction panel 11 is attached to the opening 10 b of the case 10. The suction panel 11 has a plurality of suction ports 11a arranged in a matrix. The suction panel 11 is provided for sucking air from the outside of the case 10. For example, the suction panel 11 has a filter detachable from the case 10. The fluid control device 1 discharges air sucked from the outside through a plurality of suction ports 11 a from the exhaust port 12. The attachment position of the suction panel 11 and the shape and arrangement of the suction ports 11a may be changed as appropriate.

As shown in FIG. 2, the fluid control device 1 is used as, for example, a continuous positive airway pressure (CPAP) device. The fluid control device 1 is connected to the mask 3 via the tube 2. The mask 3 is attached to the nose and mouth of the patient 4. The fluid control apparatus 1 supplies a fluid (for example, air) having a desired pressure to the patient 4 through the tube 2 and the mask 3.

Note that the state of the patient 4 (for example, during expiration) may be determined, and the pressure of the gas supplied to the patient 4 may be controlled according to the patient's state. For example, the fluid control apparatus 1 estimates the expiration state of the patient 4 wearing the mask 3 and controls the pressure value of the gas to be supplied so as to synchronize with the expiration state. For example, the pressure during inspiration is 1000 [Pa], and the pressure during expiration is 700 [Pa]. When the patient 4 is in an expired state, the breathing difficulty in the patient 4 is reduced by reducing the pressure of the gas to be supplied.

As shown in FIG. 3, the case 10 of the fluid control device 1 includes a case main body 21 whose upper portion is open and a cover member 22 that closes the opening of the case main body 21. The case body 21 has the exhaust port 12 described above, and the suction panel 11 is attached thereto.

The case main body 21 includes a partition wall 23 inside. The partition wall portion 23 is formed in a rectangular frame shape having an upper opening, and is formed integrally with the case main body 21. The opening of the partition wall 23 is closed by an intermediate cover 24 fixed to the partition wall 23. The case main body 21 has an air blowing chamber 25 surrounded by a partition wall portion 23 and an inner cover 24 therein. A fan unit 31 is accommodated in the blower chamber 25. The case body 21 has a control chamber 26 on the side opposite to the suction panel 11 with respect to the blower chamber 25. A control unit 32 is accommodated in the control chamber 26. The control unit 32 has a control board and the like, but is schematically shown in a rectangular parallelepiped shape. The control unit 32 controls the fan unit 31. The fluid control device 1 controls the above-described fluid (air) by the fan unit 31 and the control unit 32.

As shown in FIG. 5, the fan case 40 of the fan unit 31 has an intake port 40a at the top and a discharge port 40b protruding from the side. The fan case 40 accommodates the fan 50.

As shown in FIGS. 5, 6, and 8, the fan case 40 is composed of a lower case 41 and an upper case 42.
The lower case 41 has a flow path portion 41a and a discharge portion 41b. The flow path portion 41a is formed in an annular shape. As shown in FIG. 8, the flow path portion 41a is formed in a U-shaped cross section. The discharge part 41b is formed to extend from the flow path part 41a in a predetermined direction, in this embodiment, in a tangential direction of the annular flow path part 41a. A motor 60 that rotationally drives the fan 50 is attached to the inside of the flow path portion 41a. A fan 50 is fixed to the rotating shaft 61 a of the motor 60. The flow path portion 41a has the same or substantially the same radial width over the entire circumference around the rotation shaft 61a of the motor 60. That is, in the fan case 40 (lower case 41) of the present embodiment, the rotating shaft 61a of the motor 60 is not eccentric with respect to the circular flow path portion 41a.

As shown in FIG. 8, the motor 60 has a motor main body 61 and a fixed plate 62. For example, the fixed plate 62 is formed in a circular plate shape in plan view. The fixing plate 62 is fixed to the motor body 61 with screws or the like (not shown). A substantially cylindrical fixing member 63 is attached to the inside of the lower case 41. An O-ring 64 as an elastic member is disposed between the lower case 41 and the fixing member 63 and the fixing plate 62 of the motor 60. The motor 60 is supported by the lower case 41 and the fixing member 63 via an O-ring 64.

As shown in FIGS. 5 and 6, the upper case 42 has a flow path portion 42a and a discharge portion 42b. The flow path portion 42 a is formed in an annular shape, and an opening at the center thereof is an intake port 40 a that sucks air into the fan case 40. The discharge part 42b is formed to extend from the flow path part 42a in a predetermined direction, in the present embodiment, in a tangential direction of the annular flow path part 42a. A plurality of introduction wall portions 42 c are erected on the upper surface of the upper case 42. The plurality of introduction wall portions 42c are formed so as to extend along the radial direction of the upper case 42, respectively. As shown in FIG. 8, the plurality of introduction wall portions 42 c have upper ends formed substantially parallel to the middle cover 24.

As shown in FIG. 8, the fan 50 is fixed to the rotating shaft 61a of the motor 60. The motor 60 rotationally drives the rotating shaft 61a by supplying power to the motor body 61, and the rotating shaft 61a and the fan 50 rotate integrally.

As shown in FIGS. 6, 7, and 8, the fan 50 includes a holding plate 51 and a plurality of blade members 52.
As shown in FIG. 8, the holding plate 51 has a first surface 51a and a second surface 51b. The first surface 51 a is an upper surface of the holding plate 51 and is a surface on the air inlet 40 a side of the fan case 40. The second surface 51 b is a lower surface of the holding plate 51 and is a surface facing the motor main body 61.

The first surface 51a of the holding plate 51 is a concave curved surface that is positioned on the lower side as it goes radially outward from the fixed portion 51c fixed to the rotation shaft 61a in the inner peripheral portion and has a gentle slope. On the side, it extends substantially parallel to a plane orthogonal to the central axis of the holding plate 51. Furthermore, the outer peripheral end portion 51d of the holding plate 51 is formed in a skirt shape, and the first surface 51a of the outer peripheral end portion 51d is located on the lower side and becomes steeply inclined toward the outer side in the radial direction. It is a convexly curved surface (R surface).

The second surface 51b of the holding plate 51 is located on the lower side as it goes radially outward from the fixed portion 51c fixed to the rotating shaft 61a in the inner peripheral portion, and the inclination becomes gentler, and the holding plate 51 on the outer peripheral side. Extends substantially parallel to a plane perpendicular to the central axis of the. Further, the second surface of the outer peripheral end 51d of the holding plate 51 is positioned on the lower side and becomes steeper as it goes radially outward.

The outer peripheral end 51d of the holding plate 51 is formed thinner toward the radially outer tip. In the outer peripheral end 51d, the second surface 51b is a curved surface that is formed so that the thickness of the holding plate 51 is reduced toward the front end with respect to the first surface 51a. The thickness (diameter width) of the tip of the holding plate 51 is, for example, 1 mm.

As shown in FIGS. 6, 7, and 8, the plurality of blade members 52 are erected upward from the first surface 51 a of the holding plate 51. As shown in FIG. 7, the plurality of blade members 52 are formed radially when viewed from the direction of the central axis A <b> 1 of the holding plate 51. Further, the plurality of blade members 52 are arranged so that the center of gravity of the fan 50 is the central axis A1.

Specifically, the plurality of blade members 52 extend from the central region of the holding plate 51 toward the outer end of the holding plate 51 as viewed from the central axis direction of the holding plate 51. In the present embodiment, each blade member 52 is formed linearly. The end of each blade member 52 on the side of the central axis A1 of the fan 50 is located on the front side in the rotation direction of the fan 50 (counterclockwise in FIG. 7) from the other end.

7, the fan 50 includes a first blade member 53, a second blade member 54, and a third blade member 55 as the plurality of blade members 52. The lengths of the first to third blade members 53 to 55 in the radial direction are different from each other. Specifically, the first blade member 53 extends from the inner first radial position to the vicinity of the outer peripheral end portion 51 d on the first surface 51 a of the holding plate 51. The second blade member 54 extends on the first surface 51a of the holding plate 51 from the second radial position larger than the first radial position to the vicinity of the outer peripheral end 51d. The third blade member 55 extends on the first surface 51a of the holding plate 51 from the third radial position larger than the second radial position to the vicinity of the outer peripheral end 51d. The radially outer ends of the first to third blade members 53 to 55 are located on the same circumference.

In the present embodiment, the first blade member 53 and the second blade member 54 are alternately arranged in the circumferential direction of the holding plate 51. The third blade member 55 is disposed between the first blade member 53 and the second blade member 54, respectively.

As shown in FIG. 4, the inner end portion of the first blade member 53 is located on the inner side of the air inlet 40a of the fan case 40 and is exposed by the air inlet 40a. Therefore, the first radial position on the inner side where the first blade member 53 is formed is set on the inner side of the air inlet 40 a of the fan case 40.

As shown in FIG. 8, the first blade member 53 has an apex 53 c between the inner end 53 a and the outer end 53 b on the first surface 51 a of the holding plate 51. The first blade member 53 is formed so as to become higher as it goes from the inner end portion 53a to the vertex portion 53c and to become lower as it goes from the vertex portion 53c to the outer end portion 53b. FIG. 8 shows a cross section of the fan 50 in a plane including the central axis A1 of the fan 50 and passing through the vertex 53c. As shown in FIG. 8, the first blade member 53 is positioned so that the apex portion 53 c overlaps the upper case 42 in a direction parallel to the rotation shaft 61 a of the fan 50. The upper case 42 has a circular intake port 40a. Accordingly, the apex portion 53c of the first blade member 53 is located radially outside the opening end of the intake port 40a.

9, the alternate long and short dash line indicates the shape (inner end) of the second blade member 54, and the alternate long and two short dashes line indicates the shape (inner end) of the third blade member 55. The second and

third blade members

54, 55 have the outer peripheral shape that matches the shape of the first blade member 53.

The fan unit 31 includes a flow path 70 from the intake port 40 a of the fan case 40 to the discharge port 40 b of the fan case 40.
In the present embodiment, the flow path 70 includes a first flow path 71 connected to the intake port 40 a of the fan case 40 and a second flow path 72 connected to the discharge port 40 b of the fan case 40. In addition, the flow path 70 includes a buffer flow path 73 between the first flow path 71 and the second flow path 72. The flow path 70 (first flow path 71, second flow path 72, buffer flow path 73) will be described in detail.

A region between the inner surface 42d of the upper case 42 facing the first surface 51a of the holding plate 51 and the first surface 51a of the holding plate 51 is a blade member 52 (first to third blade members 53 to 53). 55) and a region where the blade member 52 (first to third blade members 53 to 55) is not formed. In the present embodiment, the first surface 51a of the holding plate 51 is sandwiched between the surface from the first radial position to the third radial position, the inner surface 42d of the upper case 42, and the two blade members 52 adjacent in the circumferential direction. This area is referred to as a first flow path 71. The first flow path 71 is connected to the air inlet 40 a of the fan case 40.

A region sandwiched between the surface of the outer peripheral end 51d of the holding plate 51 and the inner surface 42d of the upper case 42, which is a region where the above-described blade member 52 (first to third blade members 53 to 55) is not formed. The buffer channel 73 is used.

The second flow path 72 is defined from the buffer flow path 73 to the discharge port 40 b of the fan case 40.
As shown in FIG. 10, in the fan case 40 (upper case 42) and the holding plate 51, from the first surface 51 a of the holding plate 51 to the inner surface 42 d of the upper case 42 facing the first surface 51 a of the holding plate 51. The distance D1 (also referred to as the shortest distance) decreases toward the outer peripheral end 51d of the holding plate 51. The distance D1 sets the cross-sectional area and height of the first flow path 71.

In this specification, a point on the first surface 51 a is perpendicular to the first surface 51 a and includes a line segment from the first surface 51 a of the holding plate 51 to the upper case 42, and the line segment is the center of the holding plate 51. The area of the surface of the trajectory obtained by rotating around the shaft is taken as the cross-sectional area of the first flow path 71. In the present embodiment, the first surface 51a of the holding plate 51 and the inner surface 42d of the upper case 42 are such that the cross-sectional area at the end of the first flow path 71 on the intake port 40a side is the first flow on the second flow path 72 side. It is formed to be larger than the cross-sectional area at the end of the path 71. The first surface 51a of the holding plate 51 and the upper case so that the cross-sectional area at the end of the first flow path 71 on the inlet 40a side is the same as the cross-sectional area at the end of the second flow path 72 side. An inner surface 42d of 42 may be formed.

Further, in this specification, a value obtained by dividing the cross-sectional area of the first flow path 71 at a certain point on the first surface 51a by the length of the circumference of a circle passing through the point is expressed as the first flow. The height of the road 71 is assumed. The circumference of the circle passing through the point is calculated based on the radius at that point (the distance from the central axis A1 of the holding plate 51 to the point P1). In the present embodiment, the height of the first flow path 71 has a concave characteristic with respect to the radial position of the first surface 51 a of the holding plate 51. The concave characteristic will be described later with reference to FIG.

In the fan case 40 (upper case 42) and the holding plate 51, a distance D2 (also referred to as the shortest distance) from the first surface 51a of the holding plate 51 to the inner surface 42d of the upper case 42 is equal to the outer peripheral end 51d of the holding plate 51. It becomes small toward. The distance D2 sets the cross-sectional area and the height of the buffer flow path 73.

In this specification, a point on the first surface 51 a is perpendicular to the first surface 51 a and includes a line segment from the first surface 51 a of the holding plate 51 to the upper case 42, and the line segment is the center of the holding plate 51. The area of the trajectory plane obtained by rotating around the shaft is taken as the cross-sectional area of the buffer flow path 73. In the present embodiment, the first surface 51 a of the holding plate 51 and the inner surface 42 d of the upper case 42 have a cross-sectional area of the buffer flow path 73 that is substantially constant or gradually smaller from the intake port 40 a toward the second flow path 72. It is formed to become.

(Function)
Next, the operation of the fluid control device 1 and the fan unit 31 will be described.
As shown in FIG. 4, the fluid control device 1 includes a cuboid case 10, and a fan unit 31 housed in a blower chamber 25 surrounded by a partition wall portion 23 and an inner cover 24 inside the case 10. ing.

As shown in FIG. 6, the fan unit 31 includes a fan case 40 and a fan 50. The fan case 40 has an intake port 40a and a discharge port 40b. The fan 50 is provided in the fan case 40, has a first surface 51a and is rotatably supported, and a plurality of blade members 52 (first first) erected on the first surface 51a of the holding plate 51. To third blade members 53 to 55).

Further, as shown in FIG. 8, the fan unit 31 includes a flow path 70 from the air inlet 40 a of the fan case 40 to the outlet 40 b of the fan case 40. The flow path 70 includes a first flow path 71 connected to the intake port 40a, a second flow path 72 connected to the discharge port 40b, and a buffer flow path 73 between the first flow path 71 and the second flow path 72. ing. The region between the first surface 51a of the holding plate 51 and the inner surface 42d of the upper case 42 is the region where the blade member 52 (first to third blade members 53 to 55) is formed and the blade member 52 (first It includes a region where the first to third blade members 53 to 55) are not formed. In the present embodiment, a region sandwiched between the surface from the first radial position to the third radial position on the first surface 51a of the holding plate 51, the inner surface 42d of the upper case 42, and the two adjacent blade members 52 is defined. The first flow path 71 is used.

In the present embodiment, the distance D1 from the first surface 51a of the holding plate 51 to the inner surface 42d of the fan case 40 facing the first surface 51a of the holding plate 51 decreases toward the outer peripheral end 51d of the holding plate 51. To do.

According to this configuration, when the air flowing in from the intake port flows to the discharge port through the first flow path, the flow velocity increases and a smooth air flow can be realized. As a result, noise can be reduced.

Further, the blade members 52 (first to third blade members 53 to 55) are radiated from the central region of the holding plate 51 toward the outer end of the holding plate 51 as viewed from the central axis direction of the fan 50. It extends. The end of the blade member 52 on the side of the central axis A1 of the fan 50 is located on the front side in the rotational direction of the fan 50 with respect to the other end. As a result, the cross-sectional area of the first flow path 71 is substantially constant or gradually decreases from the intake port 40a toward the second flow path 72. The fan unit 31 has a characteristic that the height of the first flow path 71 is concave with respect to the radial position.

When the cross-sectional area of the first flow path 71 increases in accordance with the direction in which the fluid flows, a force in the direction of decelerating the fluid acts on the fluid. As a result, the fluid is likely to be interfered with by the constituent elements forming the flow path, and a separation phenomenon and a vortex that makes it difficult to determine the flow in a certain direction are likely to occur. The fluid separation phenomenon and the generation of vortices lead to turbulence of the flow and pressure fluctuation, and increase the noise generated by the fluid. As in the present embodiment, the cross-sectional area of the first flow path 71 at the end on the intake port 40a side is the same as or larger than the cross-sectional area of the first flow path 71 at the end on the second flow path 72 side. By doing so, since it can suppress decelerating the flow velocity of a fluid, disturbance of the fluid flow can be suppressed and noise can be suppressed.

In addition, when the cross-sectional area of the first flow path 71 is gradually reduced, the flow velocity of the fluid flowing out from the outer end of the blade member 52 (first to third blade members 53 to 55) can be increased. As a result, when a vortex is generated at the outer end of the blade member 52 (first to third blade members 53 to 55), the vortex flows quickly toward the second flow path 72, and the rear side in the rotational direction is Interference with the blade member 52 (first to third blade members 53 to 55) can be suppressed. For this reason, disturbance of the fluid flow and pressure fluctuation can be suppressed, and noise can be reduced.

A region sandwiched between the surface of the outer peripheral end 51d of the holding plate 51 and the inner surface 42d of the upper case 42, which is a region where the above-described blade member 52 (first to third blade members 53 to 55) is not formed. The buffer channel 73 is used. The first surface 51 a of the holding plate 51 and the inner surface 42 d of the upper case 42 are formed so that the cross-sectional area of the buffer flow path 73 is substantially constant or gradually decreases from the intake port 40 a toward the second flow path 72. ing.

When the cross-sectional area of the buffer flow path 73 increases in accordance with the direction in which the fluid flows, a force in the direction of decelerating the fluid acts on the fluid, and a peeling phenomenon or vortex that makes it difficult to determine the flow in a certain direction is likely to occur. The fluid separation phenomenon and the generation of vortices lead to turbulence of the flow and pressure fluctuation, and increase the noise generated by the fluid. Since the cross-sectional area of the buffer flow path 73 is the same or gradually decreased according to the fluid flow direction as in the present embodiment, it is possible to suppress the fluid flow rate from being decelerated, thereby suppressing the fluid flow disturbance. , Noise can be suppressed.

FIG. 13 shows the cross-sectional area of the first flow path 71 with respect to the radial position. In FIG. 13, solid lines and black circles indicate the characteristics of this embodiment, and in FIG. 13, alternate long and short dash lines and black triangles indicate the characteristics of the comparative example. In the present embodiment, the cross-sectional area of the first flow path 71 is substantially uniform with respect to the radial position as compared with the comparative example.

FIG. 12 shows the height of the first flow path 71 with respect to the radial position. In FIG. 12, solid lines and black circles indicate the characteristics of the present embodiment, and in FIG. 12, alternate long and short dash lines and black triangles indicate the characteristics of the comparative example. This embodiment has a concave characteristic. The term “concave characteristic” used in this specification is obvious from the solid curve in FIG. 12, but the horizontal axis indicates the radial position and the vertical axis indicates the height of the first flow path. The characteristic line that appears is a concave (concaveconcupward) curve.

The volume level (LPM) with respect to the pressure (back pressure) was measured for the present embodiment and the comparative example. The volume level is a level at a position 1 m away from the air inlet 40 a of the fan unit 31. In the measurement, the flow resistance was set to 10 cmH ₂ O / 30 LPM, and the back pressure was changed depending on the rotation speed of the fan 50. The back pressure was set to a pressure range (4 cmH ₂ O to 20 cmH ₂ O) required when the fan unit 31 and the fluid control device 1 of this embodiment are used as a CPAP device.

The measurement results are shown in FIG. In FIG. 14, the solid line and the black circle indicate the measurement results by the fan unit 31 of the present embodiment, and in FIG. 14, the alternate long and short dash line and the black triangle indicate the measurement results by the above-described comparative fan unit. In the fan unit 31 of the present embodiment, the volume level can be reduced compared to the fan unit of the comparative example.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The fan unit 31 includes a fan case 40 and a fan 50. The fan case 40 has an intake port 40a and a discharge port 40b. The fan 50 is provided in the fan case 40, has a first surface 51a and is rotatably supported, and a plurality of blade members 52 (first first) erected on the first surface 51a of the holding plate 51. To third blade members 53 to 55). The fan unit 31 includes an inner surface (an inner surface 42d of the upper case 42) of the fan case 40 facing the first surface 51a of the holding plate 51, a first surface 51a of the holding plate 51, and two adjacent blade members 52. And a first flow path 71 connected to the intake port 40a. A distance D1 from the first surface 51a of the holding plate 51 to the inner surface 42d of the fan case 40 with respect to the first surface 51a decreases toward the outer peripheral end 51d of the holding plate 51. The blade member 52 extends from the central region of the holding plate 51 toward the outer end of the holding plate 51 as viewed from the central axis direction of the fan 50. In such a fan unit 31, the fluid flow velocity is not decelerated. This makes it possible to suppress the fluid separation phenomenon and the generation of vortices, to suppress fluid flow disturbance, and to suppress noise.

(2) The plurality of blade members 52 extend from the central region of the holding plate 51 toward the outer end of the holding plate 51 when viewed from the central axis direction of the fan 50. In the plurality of blade members 52, the end of the fan 50 on the central axis A1 side is located on the front side in the rotation direction of the fan 50 with respect to the other end. The flow of the fluid moves from the center toward the outside by the rotation of the fan, and also toward the front side in the rotation direction. For this reason, since it has the shape of the blade member 52 along the flow of the fluid as compared with the fan unit using the fan in which the blade member is formed along the straight line passing through the central axis A1, the blade member 52 and the fluid Excessive interference can be suppressed and noise can be reduced.

(3) The plurality of blade members 52 include first to third blade members 53 to 55 having different lengths from the end on the central axis side of the fan 50 to the other end. In the present embodiment, a second blade member 54 shorter than the first blade member 53 is disposed between the first blade members 53 adjacent to each other in the circumferential direction of the fan 50, and the first blade member 53 and the first blade member 53 are connected to each other. A third blade member 55 shorter than the second blade member 54 is disposed between the two blade members 54. In the fan 50 having the first to third blade members 53 to 55 arranged in this manner, the first surface 51a of the holding plate 51, the inner surface of the fan case 40 (the inner surface 42d of the upper case 42), and the first to third members. The space surrounded by the blade members 53 to 55 is gradually divided from the central axis A1 side of the fan 50 toward the outside. Thereby, the change in the distance between the two adjacent blade members 52 from the center to the outside can be reduced, and the change in the distance between the holding plate 51 and the inner surface 42d of the fan case 40 can be reduced. Thereby, excessive interference with the fluid, the blade member 52, the holding plate 51, and the inner surface 42d of the fan case 40 can be suppressed, disturbance of the fluid flow can be suppressed, and noise can be suppressed.

(4) In the fan 50, the surface of the outer peripheral end portion 51d of the holding plate 51 and the inner surface 42d of the upper case 42, which are regions where the blade members 52 (first to third blade members 53 to 55) are not formed. The sandwiched area is referred to as a buffer flow path 73. The first surface 51 a of the holding plate 51 and the inner surface 42 d of the upper case 42 are formed so that the cross-sectional area of the buffer flow path 73 is substantially constant or gradually decreases from the intake port 40 a toward the second flow path 72. ing. For this reason, the flow velocity of the fluid is not decelerated, the disturbance of the fluid flow can be suppressed, and the noise can be suppressed.

In addition, you may implement the said embodiment in the following aspects.
-With respect to the said embodiment, you may change the shape of the fan 50 suitably.
FIG. 11 shows a partial cross section of a fluid control apparatus including a fan 100 according to a modified example. In this modified example, the first blade member 110 has its apex portion 111 located on the inner side of the air inlet 40 a of the fan case 40. Further, the apex 111 protrudes from the air inlet 40a to the outside of the fan case 40.

In the holding plate 120, the upper surface of the outer peripheral end 121 is cut out linearly in the cross section. Further, at the outer peripheral end 121, the radially outer side surface is formed in parallel with the central axis A <b> 1 of the holding plate 120.

In contrast to the above embodiment, the center of gravity of the fan 50 only needs to be on the central axis A1, and the arrangement and configuration of the plurality of blade members 52 (first to third blade members 53 to 55) may be changed as appropriate. Good.
For example, the first blade member 53, the second blade member 54, the second blade member 54, the first blade member 53, the second blade member 54,... At least one of 53 and the second blade member 54 may be continuously arranged.

Further, the first blade member 53, the second blade member 54, and the third blade member 55 may be sequentially disposed in the circumferential direction in this order.
For example, the third blade member 55 may be omitted, and a fan including the first blade member 53 and the second blade member 54 may be used. Alternatively, the second blade member 54 may be omitted, and a fan including the first blade member 53 and the third blade member 55 may be used. Further, the fan may be provided with a blade member shorter than the third blade member 55 together with the first to third blade members 53 to 55.

In the above embodiment, the blade member 52 (first to third blade members 53 to 55) is linear, but it may be curved or partially or from the inner end to the outer end.
-You may make it provide a narrow part in the position except the one end and the other end of the 1st flow path 71 with respect to the said embodiment. In the narrow portion, the distance from the first surface 51a of the holding plate 51 to the inner surface of the fan case 40 (the inner surface 42d of the upper case 42) facing the first surface 51a is smaller than the distance in the adjacent portion. Such a narrow portion can suppress backflow.

The technical idea that can be grasped from the above embodiment will be described below.
A fluid control device according to an embodiment of the present disclosure includes a fan case having an intake port and a discharge port, a holding plate provided in the fan case and having a first surface and rotatably supported. A plurality of blade members standing on the surface and arranged in the rotation direction, and sandwiched between the two blade members adjacent to the inner surface of the fan case and the first surface of the holding plate, A plurality of blade members extending from the central region of the holding plate toward the outer edge of the holding plate, as viewed from the central axis direction of the fan, The distance from the first surface of the holding plate to the inner surface of the fan case facing the first surface decreases from the outer peripheral end of the intake port toward the outer peripheral end of the holding plate. According to this configuration, air flow disturbance can be suppressed and noise can be reduced.

In the air blowing device, it is preferable that an end portion of the blade member on the central axis side of the fan is positioned on the front side in the rotation direction of the fan with respect to the other end portion. According to this configuration, the fluid flow is directed from the center toward the outside by the rotation of the fan, and also toward the front side in the rotation direction. For this reason, compared with a fan unit using a fan in which a blade member is formed along a straight line passing through the central axis, the blade member has a shape along the flow of the fluid, so that excessive interference between the blade member and the fluid occurs. Can be suppressed, disturbance of the air flow can be suppressed, and noise can be reduced.

In the above blower, it is preferable that the plurality of blade members include blade members having different lengths from an end portion on the central axis side of the fan to the other end portion. According to this configuration, air flow disturbance can be suppressed and noise can be reduced.

In the blower, the plurality of blade members preferably include a first blade member and a second blade member having a length shorter than that of the first blade member. According to this configuration, air flow disturbance can be suppressed and noise can be reduced.

In the above blower, it is preferable that the plurality of blade members further include a third blade member having a shorter length than the second blade member. According to this configuration, air flow disturbance can be suppressed and noise can be reduced.

A blower device according to another aspect of the disclosure includes a fan case having an intake port and a discharge port, a holding plate provided in the fan case, having a first surface and rotatably supported, and the first A plurality of blade members standing on the surface and arranged in the rotation direction, and sandwiched between the two blade members adjacent to the inner surface of the fan case and the first surface of the holding plate, A plurality of blade members extending from the central region of the holding plate toward the outer end of the holding plate, as viewed from the central axis direction of the fan, The distance from the first surface of the holding plate to the inner surface of the fan case facing the first surface is such that the distance at the outer peripheral end of the intake port is greater than the distance at the outer peripheral end of the holding plate, A narrow portion is provided in the middle of the first flow path, and the narrow portion The distance definitive is preferably smaller than the distance at the position adjacent to the narrow section. According to this configuration, it is possible to suppress the backflow of air from the discharge port side end portion of the first flow path to the intake port side end portion by the narrow portion, and it is possible to suppress the performance reduction of the blower.

The air blower described above is an annular circuit formed of a locus when a line segment from the first surface to the inner surface of the fan case is rotated around the rotation axis of the fan, and is perpendicular to the first surface of the holding plate. It is preferable that the area of the surface is a cross-sectional area, and the cross-sectional area in the central region of the holding plate is the same or larger than the cross-sectional area at the outer end of the holding plate. According to this configuration, the flow velocity of the fluid is not decelerated, air flow disturbance is suppressed, and noise can be reduced.

When the air blower rotates a line segment perpendicular to the first surface at the first surface of the holding plate and extending from the first surface to the inner surface of the fan case around the rotation axis of the fan The value of the result of dividing the area of the circular circumferential surface consisting of the locus by the circumference of the circle passing through the point is the height of the first flow path at the point, and an arbitrary radius of the first surface The height of the first flow path at the position has a concave characteristic from one end to the other end. According to this configuration, the flow rate of the fluid is not decelerated. As a result, it is possible to suppress the fluid separation phenomenon and the generation of vortices, thereby suppressing the disturbance of the air flow and reducing the noise.

A fluid control device which is one form of an indication has the above-mentioned air blower and a control device which controls the air blower. According to this configuration, it is possible to provide the air blowing device that suppresses the disturbance of the air flow and reduces the noise, and the control device can send the necessary air from the air blowing device.

DESCRIPTION OF SYMBOLS 1 ... Fluid control apparatus, 31 ... Fan unit (blower), 40 ... Fan case, 40a ... Intake port, 40b ... Discharge port, 41 ... Lower case, 42 ... Upper case, 42d ... Inner surface, 50 ... Fan, 51 ... Holding plate, 51a ... first surface, 52 ... blade member, 53 ... first blade member, 54 ... second blade member, 55 ... third blade member, 71 ... first flow path, A1 ... central axis.

Claims

A fan case having an inlet and an outlet;
A fan provided in the fan case, having a first surface and rotatably supported, and a plurality of blade members standing on the first surface and arranged in a rotation direction;
A first flow path sandwiched between the inner surface of the fan case and the two blade members adjacent to the first surface of the holding plate and connected to the intake port;
With
The plurality of blade members extend from the central region of the holding plate toward the outer end of the holding plate, as viewed from the central axis direction of the fan,
The distance from the first surface of the holding plate to the inner surface of the fan case facing the first surface decreases from the outer peripheral end of the intake port toward the outer peripheral end of the holding plate.
Blower device.
The end of the blade member on the central axis side of the fan is located on the front side in the rotational direction of the fan from the other end.
The air blower according to claim 1.
The air blower according to claim 1 or 2, wherein the plurality of blade members include blade members having different lengths from an end portion on the central axis side of the fan to the other end portion.
The blower device according to claim 3, wherein the plurality of blade members include a first blade member and a second blade member having a length shorter than that of the first blade member.
The air blower according to claim 4, wherein the plurality of blade members further include a third blade member having a length shorter than that of the second blade member.
A fan case having an inlet and an outlet;
A fan provided in the fan case, having a first surface and rotatably supported, and a plurality of blade members standing on the first surface and arranged in a rotation direction;
A first flow path that is sandwiched between the inner surface of the fan case and the two blade members adjacent to the first surface of the holding plate and connected to the intake port;
With
The plurality of blade members extend from the central region of the holding plate toward the outer end of the holding plate, as viewed from the central axis direction of the fan,
The distance from the first surface of the holding plate to the inner surface of the fan case facing the first surface is such that the distance at the outer peripheral end of the intake port is greater than the distance at the outer peripheral end of the holding plate,
A narrow portion is provided in the middle of the first flow path,
The distance in the narrow portion is smaller than the distance in a position adjacent to the narrow portion,
Blower device.
The area of an annular circumferential surface formed by a locus when a line segment from the first surface to the inner surface of the fan case is rotated around the rotation axis of the fan is perpendicular to the first surface of the holding plate. age,
The cross-sectional area in the central region of the holding plate is the same or larger than the cross-sectional area at the outer end of the holding plate,
The blower according to any one of claims 1 to 6.
An annular shape consisting of a trajectory when a line segment from the first surface to the inner surface of the fan case is rotated around the rotation axis of the fan at the point of the first surface of the holding plate. The value obtained by dividing the area of the circumference by the circumference of a circle passing through the point is the height of the first flow path at the point,
The height of the first flow path at an arbitrary radial position on the first surface has a concave characteristic from one end to the other end.
The blower according to any one of claims 1 to 6.
A fluid control device comprising: the blower device according to any one of claims 1 to 8; and a control device that controls the blower device.