Blower facility

Abstract

The blower is provided with an impeller and a housing. The impeller rotates about a central axis. The housing accommodates the impeller. The housing has a cylindrical wall portion. The cylindrical wall portion extends along the central axis and covers the impeller from the outside in the radial direction. The cylinder wall portion has a groove portion. The grooves are recessed from the inner circumferential surface in the radial direction, and are arranged in a plurality in the circumferential direction. The width of the groove portion in the circumferential direction decreases from the end portion of the impeller on the upstream side in the blowing direction toward the end portion of the impeller on the downstream side in the blowing direction.

Description

Technical Field

[0001] The invention relates to an air supply device. Background Art

[0002] Conventional air supply equipment includes an impeller that rotates about a central axis and a housing that accommodates the impeller. The housing has a cylindrical wall portion that extends along the central axis and covers the impeller from the radially outer side (for example, see Patent Document 1). Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2023-015576 Summary of the invention

[0004] Problems to be solved by the invention However, in conventional air supply equipment, there is a possibility of surging that causes turbulent air flow around the rotating impeller. When surging occurs, for example, the pressure difference and air volume between the exhaust side (downstream side in the air supply direction) and the intake side (upstream side in the air supply direction) are reduced, and the PQ characteristics may be reduced.

[0005] An object of the present invention is to provide an air supply device capable of suppressing the occurrence of surge and improving PQ characteristics. Technical solutions to solve problems

[0006] An exemplary air supply device of the present invention comprises an impeller and a housing. The impeller rotates around a central axis. The housing accommodates the impeller. The housing has a barrel wall portion. The barrel wall portion extends along the central axis and covers the impeller from the radially outer side. The barrel wall portion has a groove portion. The groove portion is radially recessed from the inner circumference, and a plurality of groove portions are arranged in the circumferential direction. The circumferential width of the groove portion decreases as it moves from the end portion on the upstream side of the impeller in the air supply direction toward the end portion on the downstream side in the air supply direction. Effects of the Invention

[0007] According to the exemplary present invention, it is possible to provide an air supply device capable of suppressing the occurrence of surge and improving the PQ characteristic. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is an overall perspective view of the air supply device according to the embodiment of the present invention. Figure 2 It is a longitudinal sectional view of the air supply device according to the embodiment of the present invention. Figure 3 It is a vertical cross-sectional perspective view of a casing of the air supply device according to the embodiment of the present invention. Figure 4 This is a perspective view showing an enlarged portion of a casing of the air blowing device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0009] Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this specification, the direction in which the central axis of the air supply device extends is referred to as the "axial direction", the direction centered on the central axis of the air supply device and perpendicular to the central axis is referred to as the "radial direction", and the direction along the arc centered on the central axis of the air supply device is referred to as the "circumferential direction". In addition, in this specification, for the sake of convenience, the axial direction is referred to as the up-down direction, and the Figure 2 The up-down direction in the specification is used as the up-down direction of the air supply device, and the shapes and positional relationships of the various parts are described. The "upper side" of the air supply device is the "intake side", and the "lower side" is the "exhaust side". In addition, the definition of the up-down direction does not limit the orientation and positional relationship of the air supply device when it is used. In addition, in this specification, the section parallel to the axial direction is called a "longitudinal section". In addition, the "parallel" used in this specification is not parallel in the strict sense, and includes approximately parallel.

[0010] <1. Overall structure of air supply equipment> Figure 1 1 is an overall perspective view of an example of an air supply device 1 according to an embodiment of the present invention. Figure 2 It is a longitudinal sectional view of the air supply device 1 .

[0011] The air blowing device 1 includes an impeller 11 , a motor 12 , and a casing 20 .

[0012] The casing 20 has an air supply passage 21 inside. The air supply passage 21 extends inside the casing 20 along the central axis J. The air supply passage 21 has an air inlet 211 at an upper end and an air outlet 212 at a lower end.

[0013] The housing 20 is a resin molded product (die molded product) and accommodates the impeller 11 , the motor 12 , and a circuit board (not shown) therein. The housing 20 includes a cylindrical wall portion 22 , a base portion 23 , a stationary blade portion 24 , and a bearing holding portion 25 .

[0014] The barrel wall portion 22 extends along the central axis J and covers the impeller 11 from the radially outer side. The barrel wall portion 22 is cylindrical and extends up and down in the axial direction. An air supply flow path 21 is arranged on the radially inner side of the barrel wall portion 22. An air intake port 211 is arranged at the axial upper end of the barrel wall portion 22. An air outlet 212 is arranged at the axial lower end of the barrel wall portion 22.

[0015] The cylindrical wall portion 22 has a groove portion 22a. The groove portion 22a is recessed in the radial direction from the inner peripheral surface of the cylindrical wall portion 22, and is arranged in a plurality of circumferential directions (see Figure 3 In the present embodiment, 16 grooves 22a are provided, and are arranged at equal intervals in the circumferential direction. The shape of the grooves 22a will be described in detail later.

[0016] The base portion 23 is disposed on the axially lower side of the motor 12 to fix the motor 12. The base portion 23 has a disk shape extending radially around the central axis J.

[0017] The stationary blade portion 24 extends radially outward from the radial outer surface of the base portion 23, connecting the base portion 23 to the cylinder wall portion 22. A plurality of stationary blade portions 24 are arranged in the circumferential direction. That is, the stationary blade portion 24 extends radially inward from the downstream end portion of the cylinder wall portion 22 in the air supply direction, and a plurality of stationary blade portions 24 are arranged in the circumferential direction. The air flowing in the air supply flow path 21 is rectified when passing between adjacent stationary blade portions 24 and is blown out to the outside of the housing 20. In the present embodiment, the stationary blade portions 24 are arranged at 8 locations, which are arranged at equal intervals in the circumferential direction.

[0018] The bearing holding portion 25 is a metal member such as brass, and is integrally formed with the base portion 23. The bearing holding portion 25 protrudes axially upward from the upper surface of the base portion 23, and has a cylindrical shape centered on the central axis J. The bearing holding portion 25 holds a bearing 122 described later inside, and constitutes a part of the motor 12. In addition, the bearing holding portion 25 may be integrally formed with the base portion 23 by the same member of resin instead of being formed by a member different from the base portion 23.

[0019] The impeller 11 is arranged radially inside the cylindrical wall portion 22 and axially above and radially outside the motor 12. The impeller 11 is a resin molded product (die molded product) and is rotated around the central axis J by the motor 12.

[0020] The impeller 11 has an impeller cup 111 and blades 112. The impeller cup 111 is fixed to the motor 12. The impeller cup 111 is a substantially cylindrical member having a cover on the axial upper side. A plurality of blades 112 are arranged in the circumferential direction on the outer surface of the impeller cup 111.

[0021] The motor 12 is fixed to the base 23 and accommodated in the housing 20 . The motor 12 rotates the impeller 11 around the central axis J (Y1 direction). The motor 12 includes a shaft 121 , a bearing 122 , a bearing holding portion 25 , a stator 123 , and a rotor 124 .

[0022] The shaft 121 is disposed along the central axis J. The shaft 121 is made of metal such as stainless steel, and is a columnar member extending vertically in the axial direction. The shaft 121 is supported by a bearing 122 so as to be rotatable about the central axis J.

[0023] At least one pair of bearings 122 is arranged in the upper and lower directions in the axial direction. The bearings 122 are held inside the bearing holding portion 25. The bearings 122 are formed of, for example, ball bearings, but may also be formed of sleeve bearings, etc. The pair of bearings 122 in the upper and lower directions in the axial direction support the shaft 121 so as to be rotatable about the central axis J relative to the housing 20.

[0024] The stator 123 is fixed to the outer peripheral surface of the bearing holding portion 25. The stator 123 includes a stator core 1231, an insulator (not shown), and a coil 1233.

[0025] The stator core 1231 is formed by stacking electromagnetic steel plates such as silicon steel plates up and down, for example. The insulator (not shown) is made of an insulating resin. The insulator (not shown) is provided so as to surround the outer surface of the stator core 1231. The coil 1233 is formed by a conductive wire wound around the stator core 1231 via the insulator.

[0026] The rotor 124 is arranged axially above and radially outside the stator 123 . The rotor 124 rotates relative to the stator 123 about the central axis J. The rotor 124 has a rotor yoke 1241 and a magnet 1242 .

[0027] The rotor yoke 1241 is made of a magnetic body and is a substantially cylindrical member having a cover on the axial upper side. The rotor yoke 1241 is fixed to the shaft 121. The magnet 1242 is cylindrical and fixed to the inner circumference of the rotor yoke 1241. The magnet 1242 is arranged radially outside the stator 123.

[0028] The circuit substrate (not shown) is, for example, arranged on the axial lower side of the impeller 11 and the axial upper side of the base portion 23. The circuit substrate is, for example, in the shape of a disk extending radially around the central axis J. The lead wire of the coil 1233 is electrically connected to the circuit substrate. An electronic circuit for supplying a driving current to the coil 1233 is mounted on the circuit substrate.

[0029] In the air supply device 1 of the above structure, when a driving current is supplied to the coil 1233 of the motor 12 via the circuit substrate, a radial magnetic flux is generated in the stator core 1231. The magnetic field generated by the magnetic flux of the stator core 1231 and the magnetic field generated by the magnet 1242 interact with each other, thereby generating a torque in the circumferential direction of the rotor 124. Through this torque, the rotor 124 and the impeller 11 rotate in the counterclockwise direction (Y1 direction) around the central axis J. When the impeller 11 rotates, an airflow is generated through the plurality of blade portions 112. That is, the air supply device 1 is capable of generating an airflow with the upper side as the intake side (upstream side in the air supply direction) X1 and the lower side as the exhaust side (downstream side in the air supply direction) X2 to supply air.

[0030] <2. Detailed structure of the housing> Figure 3 is a longitudinal sectional perspective view of the housing 20, Figure 4 It is a perspective view showing the groove portion 22 a of the housing 20 in an enlarged manner.

[0031] In the present embodiment, when the inner peripheral surface of the barrel wall portion 22 is expanded in the circumferential direction, the groove portion 22a is formed into a substantially triangular shape. Specifically, the wall surface L1 of the groove portion 22a in the rotation direction front Y1 of the impeller 11 extends in the axial direction (X1-X2 direction). In addition, the wall surface L2 of the groove portion 22a in the rotation direction rear Y2 of the impeller 11 is inclined toward the rotation direction front Y1 as it moves toward the downstream side X2 in the air supply direction. In addition, the wall surface L1 in the rotation direction front Y1 of the impeller 11 and the wall surface L2 in the rotation direction rear Y2 intersect at the end P in the air supply direction downstream side X2.

[0032] As a result, the circumferential width W of the groove portion 22a decreases as it moves from the end portion on the upstream side X1 of the impeller 11 in the air supply direction toward the end portion on the downstream side X2 in the air supply direction. Therefore, the circumferential width W of the groove portion 22a is gradually narrowed over the entire length of the air supply direction (X1-X2). As a result, the airflow flows smoothly along the groove portion 22a on the inner circumferential surface of the barrel wall portion 22 toward the downstream side X2 in the air supply direction. Therefore, the occurrence of surge can be suppressed and the PQ characteristics can be improved. In addition, since the airflow flows smoothly along the inner circumferential surface of the barrel wall portion 22, the quietness is also improved.

[0033] Furthermore, the airflow flowing along the groove portion 22a smoothly flows toward the downstream side X2 in the air supply direction while rotating along the inclined wall surface L2 of the groove portion 22a toward the front side Y1 in the rotation direction of the impeller 11. Therefore, the occurrence of surging can be further suppressed.

[0034] In addition, the airflow flowing along the groove portion 22a flows smoothly from the end portion P toward the downstream side X2 in the air blowing direction. Therefore, the occurrence of surging can be further suppressed.

[0035] In addition, the radial depth D of the groove portion 22a decreases toward the downstream side X2 in the air supply direction. Thus, the airflow flowing along the groove portion 22a flows smoothly toward the downstream side X2 in the air supply direction. Therefore, the occurrence of surging can be further suppressed.

[0036] In addition, the radial depth D of the groove 22a decreases toward the rotation direction front Y1 of the impeller 11. Therefore, the airflow flowing along the groove 22a flows smoothly toward the rotation direction front Y1 of the impeller 11. Therefore, the occurrence of surging can be further suppressed.

[0037] The end of the groove portion 22a on the upstream side X1 in the air flow direction is located closer to the upstream side X1 in the air flow direction than the end of the blade portion 112 on the upstream side X1 in the air flow direction (see Figure 1 , Figure 2). Thus, the airflow flows smoothly into the interior of the housing 20 along the groove portion 22a. In addition, the end P of the groove portion 22a on the downstream side X2 in the air supply direction is located closer to the upstream side X1 in the air supply direction than the end of the blade portion 112 on the downstream side X2 in the air supply direction. Thus, at a position closer to the downstream side X2 in the air supply direction than the blade portion 112, the airflow flows along the cylinder wall portion 22 where the groove portion 22a is not formed. Therefore, the noise generated near the end of the housing 20 on the downstream side X2 in the air supply direction can be reduced, and the quietness can be further improved.

[0038] The groove portion 22a is arranged corresponding to the stationary blade portion 24. Specifically, the end P of the groove portion 22a on the downstream side X2 in the air supply direction is located closer to the upstream side X1 in the air supply direction than the end of the stationary blade portion 24 on the upstream side X1 in the air supply direction (see Figure 4 ). In addition, in the present embodiment, the end P of the groove portion 22a on the downstream side X2 in the air supply direction is axially opposite to the end N of the root portion of the cylinder wall portion 22 side of the stationary blade portion 24 on the rear side Y2 in the rotation direction of the impeller 11. As a result, the airflow flowing along the groove portion 22a flows smoothly toward the stationary blade portion 24. Therefore, the occurrence of surging can be further suppressed.

[0039] (4. Others) The above-mentioned embodiments are merely examples of the present invention. In addition, the structure of the embodiments may be appropriately changed without departing from the technical concept of the present invention. In addition, the embodiments may be implemented in combination within a possible range. For example, in the present embodiment, the grooves 22a are provided at 16 locations, but may be provided at more than 17 locations. In addition, the grooves 22a may be provided at less than 15 locations.

[0040] (5. Notes) As described above, a technical solution disclosed herein involves an air supply device 1 having an impeller 11 rotating around a central axis J and a housing 20 for accommodating the impeller, the housing having a cylindrical wall portion 22 extending along the central axis and covering the impeller from the radially outer side, the impeller having a plurality of blade portions 112 arranged in a circumferential direction, the cylindrical wall portion having a plurality of groove portions 22a which are radially recessed from the inner circumferential surface and are arranged in a circumferential direction, and the circumferential width W of the groove portion decreases from the end portion of the impeller on the upstream side X1 in the air supply direction toward the end portion of the impeller on the downstream side X2 in the air supply direction (first structure).

[0041] Furthermore, in the above-mentioned first configuration, the radial depth D of the groove portion decreases toward the downstream side in the air blowing direction (second configuration).

[0042] Furthermore, in the above-mentioned first or second configuration, the radial depth D of the groove portion decreases toward the front in the rotation direction of the impeller (third configuration).

[0043] In addition, in any of the first to third structures mentioned above, the end face L1 of the groove portion in front of the impeller in the rotation direction Y1 extends axially, and the end face L2 of the impeller in the rotation direction rearward Y2 extends obliquely toward the front of the rotation direction as it moves toward the downstream side of the air supply direction (fourth structure).

[0044] In any one of the first to fourth structures, the end surface of the groove portion at the front in the rotation direction and the end surface at the rear in the rotation direction intersect at the end portion P on the downstream side in the air blowing direction (fifth structure).

[0045] In addition, in any one of the first to fifth structures mentioned above, the impeller has a plurality of blade portions 112 arranged along the circumferential direction, and the end portion of the groove portion on the upstream side in the air supply direction is located closer to the upstream side in the air supply direction than the end portion of the blade portion on the upstream side in the air supply direction (sixth structure).

[0046] In any one of the first to sixth structures, the end of the groove portion on the downstream side in the air blowing direction is located upstream of the end of the blade portion on the downstream side in the air blowing direction (seventh structure).

[0047] In any one of the first to seventh structures, the shell has a plurality of stationary blade portions 24 extending radially inward from the downstream end of the cylinder wall portion in the air supply direction and arranged circumferentially, and the groove portion is configured corresponding to the stationary blade portion (seventh structure). Industrial Applicability

[0048] The present invention can be used, for example, in air supply equipment for cooling a server. Explanation of symbols

[0049] 1 Air supply equipment 11 Impeller 12 Motor 20 Shell 21 air supply flow path 22 cylinder wall 22a Groove 23 base 24Stator blades 25Bearing retaining part 111 Impeller Cup 112 blade part 121 axis 122 bearings 123 stator 124 rotor 211 Intake port 212 Blowing outlet 1231 stator core 1233 Coil 1241 rotor yoke 1242 Magnet D Depth J Center axis L1 wall L2 wall N-Terminal P end W Width X1 Upstream side of air supply direction X2 downstream side of air supply direction Y1 Rotation direction forward Y2 rotation direction backward.

Claims

1. An air supply device, characterized in that: have: an impeller that rotates about a central axis; and a housing for housing the impeller, The housing has a cylindrical wall portion extending along the central axis and covering the impeller from the radially outer side. The cylindrical wall portion has a groove portion, which is recessed radially from the inner peripheral surface and is arranged in a plurality of groove portions along the circumferential direction. The circumferential width of the groove portion decreases from an end portion on the upstream side in the air blowing direction of the impeller toward an end portion on the downstream side in the air blowing direction.

2. The air supply device according to claim 1, characterized in that: The radial depth of the groove portion decreases toward the downstream side in the air blowing direction.

3. The air supply device according to claim 1 or 2, characterized in that: The radial depth of the groove portion decreases toward the front in the rotation direction of the impeller.

4. The air supply device according to claim 1 or 2, characterized in that: A wall surface of the groove portion in front of the impeller in the rotation direction extends in the axial direction, and a wall surface in rear of the impeller in the rotation direction is inclined toward the front of the rotation direction as it goes toward the downstream side in the air blowing direction.

5. The air supply device according to claim 4, characterized in that: A wall surface of the groove portion at the front side in the rotation direction and a wall surface at the rear side in the rotation direction intersect at an end portion on the downstream side in the air blowing direction.

6. The air supply device according to claim 1 or 2, characterized in that: The impeller has a plurality of blades arranged in a circumferential direction. An end portion of the groove portion on the upstream side in the air blowing direction is located further upstream in the air blowing direction than an end portion of the blade portion on the upstream side in the air blowing direction.

7. The air supply device according to claim 6, characterized in that: An end portion of the groove portion on the downstream side in the air blowing direction is located on the upstream side in the air blowing direction relative to an end portion of the blade portion on the downstream side in the air blowing direction.

8. The air supply device according to claim 1 or 2, characterized in that: The housing has a plurality of stationary blades extending radially inward from a downstream end of the cylinder wall in the air supply direction and arranged in a circumferential direction. The groove portion is arranged corresponding to the stationary blade portion.

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