WO2022153522A1 - 遠心送風機 - Google Patents
遠心送風機 Download PDFInfo
- Publication number
- WO2022153522A1 WO2022153522A1 PCT/JP2021/001420 JP2021001420W WO2022153522A1 WO 2022153522 A1 WO2022153522 A1 WO 2022153522A1 JP 2021001420 W JP2021001420 W JP 2021001420W WO 2022153522 A1 WO2022153522 A1 WO 2022153522A1
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- WO
- WIPO (PCT)
- Prior art keywords
- opening
- air
- casing
- impeller
- centrifugal blower
- Prior art date
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- 238000011144 upstream manufacturing Methods 0.000 description 10
- 238000009423 ventilation Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
Definitions
- This disclosure relates to a centrifugal blower.
- a bell mouth was provided in the opening for sucking air provided in the casing of the centrifugal blower in order to secure an effective area for suction. Further, on the opening side of the impeller provided inside the conventional casing, a side plate for guiding the air flowing into the impeller from the outlet of the bell mouth is provided.
- Patent Document 1 in order to prevent the air flowing into the impeller from the outlet of the bell mouth provided in the opening from separating from the side plate, the minimum diameter of the outlet of the bell mouth and the side plate of the impeller are set to the same diameter. Centrifugal blowers are disclosed.
- the present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a centrifugal blower that allows air taken in from the outside of the casing to flow into the impeller more efficiently.
- the centrifugal blower includes a drive motor having a rotating shaft, a casing having an opening surface having an opening in the axial direction of the rotating shaft, and air rotatably provided inside the casing around the rotating shaft. Is provided with an impeller provided with an inlet for taking in air on the opening side and an air inlet having an inner diameter smaller than the inner diameter of the opening and the inlet, while blowing out from the axial direction of the rotating shaft in the centrifugal direction. It is a thing.
- FIG. 5 is a cross-sectional view of a cross section perpendicular to the rotation axis of the centrifugal blower according to the first embodiment. It is a perspective view of the impeller in Embodiment 1. FIG. It is a detailed view near the opening of the centrifugal blower in Embodiment 1.
- FIG. FIG. 5 is a cross-sectional view of a cross section including a rotation axis of the centrifugal blower according to the second embodiment.
- FIG. 5 is a cross-sectional view of a cross section including a rotation axis of the centrifugal blower according to the third embodiment. It is sectional drawing which shows the modification which changed the position of the impeller of the centrifugal blower in Embodiment 3. It is sectional drawing which shows the modification which changed the size of the impeller of the centrifugal blower in Embodiment 3.
- FIG. FIG. 5 is a cross-sectional view of a cross section including a rotation axis of the centrifugal blower according to the fourth embodiment. It is a graph which shows the ventilation performance of the centrifugal blower in Embodiment 4.
- FIG. 5 is a cross-sectional view of a cross section including a rotation axis of the centrifugal blower according to the fifth embodiment. It is sectional drawing which shows the modification which did not provide the protrusion
- Embodiment 1 The centrifugal blower 100 according to the first embodiment will be described in detail below with reference to the drawings.
- the same reference numerals in the drawings represent the same or corresponding parts.
- FIG. 1 is a perspective view of the centrifugal blower 100 according to the first embodiment.
- the centrifugal blower 100 has an impeller 20 that generates an air flow in the centrifugal direction by rotation, a drive motor 10 that rotates the impeller 20 and only a rotation shaft 11 is shown in FIG. 1, a part of the drive motor 10, and an impeller 20. It is provided with a casing 30 for accommodating the above.
- the centrifugal blower 100 takes in air from the opening 31a of the casing 30 and blows out the air from the air outlet 34a by rotating the impeller 20 by the drive motor 10.
- FIG. 2 is a cross-sectional view of a cross section of the centrifugal blower 100 including the rotating shaft 11.
- FIG. 3 is a cross-sectional view of a cross section perpendicular to the rotation axis 11 of the centrifugal blower 100.
- the cross section shown in FIG. 2 is shown by the cutting line XX in FIG. 3, and the cross section shown in FIG. 3 is shown by the cutting line YY in FIG.
- FIG. 4 is a perspective view of the impeller 20 according to the present embodiment.
- the drive motor 10 has a rotating shaft 11 and rotates the impeller 20 described below.
- the impeller 20 is a multi-blade impeller having a plurality of blades 22, and blows out air taken in from the axial direction of the rotating shaft 11 in the centrifugal direction.
- the impeller 20 includes a disk-shaped main plate 21 having a hole for fixing the rotating shaft 11 in the center, a plurality of blades 22 arranged at intervals on the outer edge of the main plate 21 in the circumferential direction of the rotating shaft 11, and a main plate. It has an annular air introduction portion 23 provided so as to cover one end of a plurality of blades 22 on the opening 31a side opposite to the 21.
- the casing 30 which is a scroll casing has an opening surface 31 provided with an opening 31a, a bottom surface 33 facing the opening surface 31, and a side surface 32 provided in the circumferential direction of the rotation shaft 11. Further, the opening surface 31, the bottom surface 33, and the side surface 32 form the tongue portion 34.
- the tongue portion 34 includes an air outlet 34a that blows out the airflow generated by the rotation of the impeller 20, and guides a part of the generated airflow to the airflow outlet 34a.
- the opening 31a in the present embodiment does not have a shape that changes the air passage cross-sectional area like the bellmouth shape, and the air passage cross-sectional area of the opening 31a is constant along the air passage from the upstream end to the downstream end. ..
- the opening 31a is a hole provided in the opening surface 31 which is a plate material. That is, the opening 31a having a constant air passage cross-sectional area along the air passage from the upstream end to the downstream end is a cylindrical hole in which the upstream end is the front surface of the opening surface 31 and the downstream end is the back surface of the opening surface 31. Is.
- FIG. 5 is an enlarged view of the opening 31a of the centrifugal blower 100 and the vicinity of the air introduction portion 23 according to the present embodiment.
- the air introduction portion 23 has a bell mouth shape in which the inner diameter on the main plate 21 side is smaller than that on the opening 31a side, and the air introduction portion 23 reduces the cross-sectional area of the air flowing in from the opening 31a. Further, the air introduction unit 23 includes an inlet 23b, which is an end on the opening 31a side for taking in air, and an outlet 23a, which is an end on the main plate 21 side for sending air to the inside of the impeller 20. That is, the inlet 23b is on the upstream side of the air flow and the outlet 23a is on the downstream side of the air flow.
- the inner diameter of the inlet 23b is larger than the inner diameter Dc of the opening 31a, and the inner diameter Di of the outlet 23a is smaller than the inner diameter Dc of the opening 31a and the inner diameter of the inlet 23b.
- Dc and Di in FIG. 2 indicate that the diameter Di of the outlet 23a is smaller than the diameter Dc of the opening 31a.
- the length from the rotating shaft 11 to the end of the blade 22 far from the rotating shaft 11 is the same as the length from the rotating shaft 11 to the end of the inlet 23b. That is, the outer diameter of the air introduction portion 23 of the impeller 20 and the outer diameter of the blade 22 portion are the same, and the size of the outer diameter of the impeller 20 is constant.
- the circulating flow merges with the air taken in from the opening 31a and is blown out again in the centrifugal direction of the rotating shaft 11. Further, as shown in FIG. 3, the air flow flows to the tongue portion 34 while forming the above-mentioned circulating flow, and is blown out from the outlet 34a.
- the inner diameter of the outlet 23a of the air introduction portion 23 is smaller than the inner diameter of the opening 31a and is inside. Therefore, the air taken in from the edge of the opening 31a comes into contact with and adheres to the air introduction portion 23, and flows along the air introduction portion 23 toward the rotating shaft 11 side of the impeller 20. Further, the circulating flow flowing in the direction of the rotating shaft 11 along the opening surface 31 also merges with the air taken in from the opening 31a to move to the rotating shaft 11 side of the impeller 20 along the air introduction portion 23. Will flow in. Then, the air that has flowed into the rotating shaft 11 side of the impeller 20 is blown out in the centrifugal direction of the rotating shaft 11.
- the inner diameter Di of the outlet 23a of the air introduction portion 23 is smaller than the inner diameter Dc of the opening 31a as described above. Therefore, the air taken in from the edge of the opening 31a comes into contact with and adheres to the air introduction portion 23, and is rectified by the surface of the air introduction portion 23. Therefore, the air flowing into the impeller 20 from the opening 31a of the casing 30 is less likely to be separated.
- the air taken in from the outside of the casing 30 can be efficiently flowed into the impeller 20. In addition, noise deterioration due to peeling can be prevented.
- the air introduction portion 23 covers the opening 31a side of the blade 22, it is possible to prevent the circulating flow from colliding with the tip of the blade 22 on the opening 31a side. Therefore, it is possible to suppress deterioration of ventilation performance and noise deterioration due to collision between the circulating flow and the blade 22.
- the bell mouth provided at the opening of the casing throttles the air flow and increases the flow velocity, so that it is difficult for the air to reattach to the air introduction portion when the air is separated.
- the opening 31a has no change in the cross-sectional area of the air passage and does not have a bell mouth shape unlike a conventional centrifugal blower. Therefore, the change in the velocity of the air passing through the opening 31a is suppressed, and even if the air is separated, the air is likely to reattach to the air introduction portion 23. Further, since the simple structure in which the air passage cross-sectional area of the opening 31a is constant, the casing can be formed at low cost.
- Embodiment 2 the outer diameter of the inlet 23b of the air introduction portion 23 is larger than the inner diameter of the opening 31a of the casing 30. That is, the outer diameter of the entire impeller 20 having the air introduction portion 23 was larger than the inner diameter of the opening 31a. In this embodiment, the outer diameter Df of the impeller 20 is made smaller than the inner diameter Dc of the opening 31a.
- the configuration of the present embodiment will be described with reference to FIG. 6, focusing on the differences from the first embodiment.
- the air introduction unit 23 has a bell mouth shape in which the inner diameter of the outlet 23a on the main plate 21 side is smaller than that of the inlet 23b on the opening 31a side, as in the first embodiment. Then, in the present embodiment, the outer diameter Df of the inlet 23b is smaller than the inner diameter Dc of the opening 31a. Further, since the size of the outer diameter of the impeller 20 is constant, the outer diameter of the entire impeller 20 is also smaller than the inner diameter Dc of the opening 31a. Further, the inner diameter Di of the outlet 23a is smaller than the inner diameter Dc of the opening 31a. Dc, Di and Df in FIG. 6 indicate that the diameter Di of the outlet 23a and the outer diameter Df of the impeller 20 are smaller than the diameter Dc of the opening 31a.
- the impeller 20 since the outer diameter of the impeller 20 is smaller than the inner diameter of the opening 31a, the impeller 20, or both the impeller 20 and the drive motor 10 can be easily passed through the opening 31a from the inside of the casing 30. Can be taken out. Further, since the tip of the blade 22 on the opening 31a side is covered by the air introduction portion 23, there is no possibility that the operator touches the opening 31a side of the blade 22 when taking out the impeller 20. Therefore, the operator can easily perform maintenance on the centrifugal blower 100. In the present embodiment as well, as in the first embodiment, since the inner diameter Di of the outlet 23a is smaller than the inner diameter Dc of the opening 31a, the air flowing into the impeller 20 from the opening 31a of the casing 30 is centrifugal. It is harder to peel off than a blower.
- Embodiment 3 In the present embodiment, a protruding portion 35 protruding inward of the casing 30 is provided around the opening 31a of the opening surface 31.
- the configuration of the present embodiment will be described with reference to FIG. 7, focusing on the differences from the second embodiment.
- the edge of the opening 31a protrudes inside the casing 30 to form the protruding portion 35.
- the axial length of the rotating shaft 11 of the protruding portion 35 is longer than the length from the opening surface 31 to the inlet 23b of the air introducing portion 23.
- the dotted line in FIG. 7 represents the circulating flow.
- the protruding portion 35 is formed in an annular shape over the entire circumference of the opening 31a.
- the air passage cross-sectional area of the opening 31a is constant from the upstream end to the downstream end along the air passage, as in the first and second embodiments.
- the opening 31a is formed by a protrusion 35 provided on the opening surface 31. That is, in the present embodiment, the upstream end of the opening 31a is the surface of the opening surface 31 and the outer end of the protruding portion 35. Further, the downstream end of the opening 31a is the inner end of the protruding portion 35 protruding from the back surface of the opening surface 31.
- the impeller 20 of the present embodiment has the same configuration as that of the second embodiment, and the same effect as that of the second embodiment can be obtained. Further, according to the present embodiment, the protrusion 35 covers the gap between the opening surface 31 and the air introduction portion 23. Therefore, when the circulating flow hits the protruding portion 35, it becomes difficult for the circulating flow to flow to the rotation shaft 11 side of the impeller 20. Therefore, air is less likely to leak from the opening 31a to the outside of the casing 30, the ventilation performance is improved, and noise is reduced.
- FIGS. 8 and 9 show a centrifugal blower 100 provided with a protruding portion 36 in which the edge of the opening 31a is also projected to the outside of the casing 30.
- FIG. 8 shows a cross-sectional view of the centrifugal blower 100 in which the mounting position of the impeller 20 is moved toward the opening surface 31 side.
- FIG. 9 shows a centrifugal blower 100 provided with an impeller 20a in which the impeller 20 is enlarged in the axial direction of the rotating shaft 11.
- the protruding portion 36 is provided on both the inside and the outside of the casing 30, it protrudes even when the mounting positions and dimensions of the impellers 20 and 20a in the axial direction of the rotating shaft 11 are changed.
- the change in the gap between the opening 31a and the impellers 20 and 20a can be suppressed by the portion 36 and the air introduction portion 23. Therefore, when the ventilation performance such as the air volume and the static pressure of the centrifugal blower 100 is changed, the impellers 20 and 20a can be replaced without changing the shape of the casing 30. That is, the range of aerodynamic design can be expanded by the centrifugal blower 100 of the casing 30 having the same shape.
- Embodiment 4 In this embodiment, the inlet 23b of the air introduction portion 23 is provided outside the casing 30.
- the configuration of the present embodiment will be described with reference to FIG. 10, focusing on the differences from the third embodiment.
- the impeller 20b includes an air introduction unit 24.
- the air introduction unit 24 has a bell mouth shape similar to that of the air introduction units 23 of the first to third embodiments.
- the inlet 24b which is on the upstream side of the air flow, is outside the opening 31a of the casing 30.
- the outlet 24a on the downstream side of the air flow is inside the opening 31a.
- the outer diameter of the inlet 24b is larger than the inner diameter of the opening 31a, and the inner diameter of the outlet 24a is smaller than the inner diameter of the opening 31a.
- the size of the outer diameter of the impeller 20 was constant.
- the outer diameter of the inlet 24b which is the outer diameter of the outer diameter of the casing 30 of the impeller 20b, is larger than the inner diameter of the opening 31a, but the outer diameter of the blade 22 portion, which is the inner outer diameter, is the opening. It is smaller than the inner diameter of 31a.
- the air passage cross-sectional area can be greatly expanded on the upstream side of the air flow. It becomes more difficult to separate the air flow. Further, by increasing the radius of curvature of the air introduction portion 24, the centrifugal force generated in the air flow in the air introduction portion 24 can be reduced, and the air is easily flowed by the blade 22 of the impeller 20b, so that the ventilation efficiency is increased. Is improved.
- FIG. 11 is a graph showing the relationship between the static pressure characteristic and the air volume when the rotation speed of the drive motor 10 is constant.
- “The present disclosure” indicated by a black circle in the figure represents the centrifugal blower 100 of the fourth embodiment.
- the "conventional example” shown by a white circle in the figure represents a centrifugal blower in which a bell mouth is provided in the opening of the casing and an air introduction portion is not provided in the impeller.
- the horizontal axis represents the air volume and the vertical axis represents the static pressure.
- the static pressure fan efficiency of the centrifugal fan 100 was calculated from the following formula 1.
- Equation 1 above ⁇ represents fan efficiency. Further, P [Pa] represents static pressure, Q [m 3 / min] represents air volume, and W [W] represents shaft output.
- the centrifugal blower 100 of the present embodiment has an efficiency improvement of about 1 pt near the maximum efficiency point as compared with the conventional example.
- the above effect is obtained because the inlet 24b is on the outside of the casing 30 and is larger than the inner diameter of the opening 31a, but the inner diameter of the outlet 24a of the air introduction portion 24 is the opening 31a of the casing 30. Since it is smaller than the inner diameter of the impeller 20b, the blade 22 portion of the impeller 20b can be accommodated inside the casing 30. Therefore, in the present embodiment, instead of the openings 31a of the first to third embodiments, it is difficult to separate the air from the inlet 24b, which is the upstream of the air flow that takes in the outside air in the present embodiment, from the air introduction portion 24. In this state, it can flow into the rotating shaft 11 side of the impeller 20b. Therefore, the problem can be solved in this embodiment as well as in other embodiments.
- protruding portion 35 is provided in the present embodiment, it is not necessary to provide the protruding portion 35 as shown in FIG.
- Embodiment 5 the inlet 24b of the air introduction portion 24 is provided outside the casing 30, but in the present embodiment, the outer edge portion 26 is further provided on the outer edge of the air introduction portion 24. .. The differences from the fourth embodiment will be mainly described with reference to FIG.
- the impeller 20c is provided with an air introduction unit 25.
- the inlet 25b of the air introduction portion 25 protrudes to the outside of the casing 30 through the opening 31a.
- the air introduction portion 25 is provided with an outer edge portion 26 at the inlet 25b.
- the outer edge portion 26 is a portion of the air introduction portion 25 where the size of the gap with the outer surface of the opening surface 31 changes, and is provided over the entire circumference of the inlet 25b of the air introduction portion 25. As shown in FIG. 13, the outer edge portion 26 has an arc-shaped cross section in the radial direction of the rotating shaft 11. The gap between the outer edge portion 26 and the opening surface 31 gradually increases from the inside to the outside in the radial direction of the rotating shaft 11, and gradually decreases toward the outside. That is, the outer edge portion 26 has a mountain-like shape, and there is a portion inside the outermost portion where the gap between the air introduction portion 25 and the outer surface of the opening surface 31 is maximized.
- the casing 30 of the present embodiment faces the portion where the gap between the air introduction portion 25 and the outer surface of the opening surface 31 is maximized instead of the protruding portion 35 of the third and fourth embodiments.
- a protruding portion 37 is provided.
- the protruding portion 37 is a recess recessed from the outside to the inside of the opening surface 31.
- the protruding portion 37 expands the gap between the outer surface of the opening surface 31 and the air introducing portion 25, and protrudes toward the inside of the casing 30.
- H and H max in FIG. 13 are the sizes of the gaps in the innermost portion of the outermost portion 26 of the outermost portion 26, which is larger than the size H of the gap between the air introduction portion 25 and the opening surface 31. It shows that H max is larger.
- the size of the gap between the outer surface of the opening surface 31 and the air introduction portion 25 changes from the inside to the outside of the rotating shaft 11 by the outer edge portion 26. That is, a pressure loss occurs in the flow of air leaking to the outside through this gap. Therefore, it is possible to reduce the amount of air leaking to the outside of the casing 30 by removing this gap. By reducing the air leaking from the gap, the ventilation efficiency can be further improved.
- the protrusion 37 is provided with a recess, the change in the gap between the outside of the opening surface 31 and the air introduction portion 25 can be made larger. Therefore, the air leaking from the gap to the outside of the casing 30 can be further reduced. Further, the projecting portion 37 also plays a role of preventing the circulating flow from moving toward the rotation shaft 11 side, as in the projecting portions 35 of the third and fourth embodiments.
- the protruding portion 37 is provided with a recess on the outer surface of the opening surface 31, but may be provided with a protruding portion 35 having no recess as in the third and fourth embodiments. However, as shown in FIG. 14, the protrusions 35 and 37 may not be provided. Even in this case, the size H max of the gap where the gap is maximized in the inner portion of the outer edge portion 26 is larger than the size H of the gap between the air introduction portion 25 and the opening surface 31 on the outermost side. Is larger, and the effect of pressure loss can be obtained.
- the outer edge portion 26 has a single mountain shape, but may have two or more mountain shapes.
- the outer edge of the air introduction portion 25 of the present embodiment may be further provided with a portion such that the gap with the opening surface 31 gradually increases from the inside to the outside of the rotating shaft 11.
- the air introduction portions 23, 24, and 25 have a bell mouth shape, but any one may be used as long as the air passage cross-sectional area decreases from the upstream to the downstream of the air flow.
- the air introduction portion 23 may have a truncated cone shape.
- the impellers 20, 20a, 20b, and 20c are multi-blade impellers having a plurality of blades 22, but if the air taken in from the axial direction of the rotating shaft 11 is blown out in the centrifugal direction, this is used. Not limited to.
- the relationship between the sizes of the blade 22 and the air introduction portions 23, 24, 25 is not limited to the embodiment.
- the distance from the rotating shaft 11 in the centrifugal direction to the end far from the rotating shaft 11 of the blade 22 is the same as the distance from the rotating shaft 11 to the end of the inlet 23b.
- the blade 22 is formed so that the distance from the rotating shaft 11 to the end far from the rotating shaft 11 of the blade 22 is shorter than the distance from the rotating shaft 11 to the end of the inlet 23b as shown in FIG. good. That is, the outer diameter of the blade 22 portion of the impeller 20 and the outer diameter of the air introduction portions 23, 24, 25 do not have to be the same.
- the casing 30 is a scroll casing, but the shape of the casing is not limited to this.
- the casing may be cylindrical and blown out in the axial direction of the rotating shaft 11.
- the cross-sectional area of the air passage of the opening 31a was constant, but it is not limited to this for solving the problem.
- the shape of the opening 31a may be a bell mouth shape in which the inner diameter of the air outlet is smaller than the inner diameter of the inlet.
- the inner diameters of the outlets 23a, 24a, 25a of the air introduction portions 23, 24, 25 may be smaller than the inner diameters of the outlets of the openings 31a.
- the opening 31a may have any shape as long as the inner diameters of the outlets 23a, 24a, 25a of the air introduction portions 23, 24, 25 are smaller than the minimum diameter of the opening 31a.
- the centrifugal blower 100 is a single suction type centrifugal blower 100 having an opening surface 31 on one side of the casing 30 and a bottom surface 33 on the opposite surface, but a double suction type may be used.
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Abstract
Description
以下に実施の形態1に係る遠心送風機100を図面に基づいて詳細に説明する。なお、各図面における同一の符号は同一又は相当の部分を表している。
実施の形態1において空気導入部23の入口23bの外径は、ケーシング30の開口31aの内径よりも大きいものであった。すなわち、空気導入部23を有する羽根車20全体の外径は、開口31aの内径よりも大きいものであった。本実施の形態は、羽根車20の外径Dfを開口31aの内径Dcよりも小さくしたものである。図6を用いて本実施の形態の構成について実施の形態1との相違点を中心に説明する。
本実施の形態は、開口面31の開口31aの周りに、ケーシング30の内部方向へ突出した突出部35を設けたものである。図7を用いて本実施の形態の構成について実施の形態2との相違点を中心に説明する。
本実施の形態は、空気導入部23の入口23bをケーシング30の外に設けたものある。図10を用いて本実施の形態の構成について実施の形態3との相違点を中心に説明する。
実施の形態4では、空気導入部24の入口24bをケーシング30の外に設けたものであったが、本実施の形態は、空気導入部24の外縁にさらに外縁部26を設けたものである。図13を用いて実施の形態4との相違点を中心に説明する。
Claims (6)
- 回転軸を有する駆動モータと、
前記回転軸の軸方向上に開口を設けた開口面を有するケーシングと、
前記ケーシングの内部に前記回転軸を中心として回転可能に設けられ、空気を前記回転軸の軸方向から遠心方向に吹出すとともに、前記開口側に前記空気を取り込む入口並びに前記開口及び前記入口の内径よりも内径が小さい前記空気の出口を有する空気導入部が設けられた羽根車と、
を備えた遠心送風機。 - 前記開口の風路断面積は風路に沿って一定であることを特徴とする請求項1に記載の遠心送風機。
- 前記開口の内径は、前記ケーシングの内部における前記羽根車の外径よりも大きいことを特徴とする請求項1又は2に記載の遠心送風機。
- 前記ケーシングは、前記開口の周りに前記ケーシングの内部の方向へ突出した突出部を備えたことを特徴とする請求項1から3のいずれか一つに記載の遠心送風機。
- 前記空気導入部の前記入口の外径は前記開口の内径よりも大きく、前記空気導入部の前記入口は前記ケーシングの外部に出ていることを特徴とする請求項1から4のいずれか一つに記載の遠心送風機。
- 前記空気導入部は、前記入口に、前記ケーシングの前記開口面との隙間が前記回転軸の半径方向の内側から外側に向かうにつれて大きくなり、さらに外側に向かうにつれて前記隙間が小さくなる外縁部を備えたことを特徴とする請求項5に記載の遠心送風機。
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PCT/JP2021/001420 WO2022153522A1 (ja) | 2021-01-18 | 2021-01-18 | 遠心送風機 |
CN202180089536.3A CN116745533A (zh) | 2021-01-18 | 2021-01-18 | 离心送风机 |
JP2022575026A JP7466707B2 (ja) | 2021-01-18 | 2021-01-18 | 遠心送風機 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS52102909U (ja) * | 1976-02-02 | 1977-08-04 | ||
JP2009168006A (ja) * | 2007-12-18 | 2009-07-30 | Denso Corp | 送風ユニット |
CN210440276U (zh) * | 2019-07-22 | 2020-05-01 | 珠海格力电器股份有限公司 | 用于离心风机的叶轮组件、离心风机、空调器及空气净化器 |
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CN210440276U (zh) * | 2019-07-22 | 2020-05-01 | 珠海格力电器股份有限公司 | 用于离心风机的叶轮组件、离心风机、空调器及空气净化器 |
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