WO2023089658A1 - クロスフローファン - Google Patents
クロスフローファン Download PDFInfo
- Publication number
- WO2023089658A1 WO2023089658A1 PCT/JP2021/042057 JP2021042057W WO2023089658A1 WO 2023089658 A1 WO2023089658 A1 WO 2023089658A1 JP 2021042057 W JP2021042057 W JP 2021042057W WO 2023089658 A1 WO2023089658 A1 WO 2023089658A1
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- WIPO (PCT)
- Prior art keywords
- blade
- cross
- flow fan
- blades
- convex portion
- Prior art date
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- 230000007423 decrease Effects 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims description 58
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 21
- 239000011295 pitch Substances 0.000 description 18
- 238000000926 separation method Methods 0.000 description 12
- 238000007664 blowing Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
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- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
- F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
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- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
Definitions
- the present disclosure relates to cross-flow fans.
- each blade of the fan is configured so that the outer diameter side end of the blade deforms into a different shape in the axial direction based on the pressure difference between the pressure surface and the suction surface of the blade.
- Patent Literature 1 Japanese Patent Literature 1
- the outer diameter side end portion of the blade deforms toward the suction surface side based on the pressure difference between the pressure surface and the suction surface of the blade. , intended to distribute the flow between the blades to reduce noise.
- the exit angle of the outer peripheral side of the blade increases.
- the separation of the airflow increases between the blades on the rear guide side, where the amount of inflowing air is small, and the noise of the fan as a whole increases. It may worsen or cause abnormal noise.
- This disclosure has been made to solve such problems. It is an object of the present invention to provide a cross-flow fan capable of suppressing a decrease in stall resistance, improving fan efficiency, reducing fan input, and reducing noise.
- a cross-flow fan according to the present disclosure is provided between a plurality of support members arranged at predetermined intervals in a rotation axis direction and exhibiting a circular or annular flat plate shape, and adjacent support members. a plurality of blades arranged near the outer circumference of the member and spaced apart in the circumferential direction, each blade having a pressure surface on the side in the rotation direction and a suction surface on the side opposite to the rotation direction.
- the suction surface of the blade is formed with a protrusion that bulges in the counter-rotational direction, and in a cross section perpendicular to the rotation axis, the protrusion of the blade is located between the suction surface of the blade and the blade of the imaginary circles that are in contact with both the pressure surface of the blade adjacent to the counter-rotating direction side of the blade, the outermost circle and the inner peripheral side of the outer peripheral end of the blade
- the convex portion and the negative pressure surface on the inner peripheral side of the convex portion are connected by a straight portion, and the straight portion connects the convex portion and the negative pressure surface on the inner peripheral side of the convex portion. is the tangent line that is tangent to both
- the cross-flow fan According to the cross-flow fan according to the present disclosure, it is possible to improve the fan efficiency, reduce the fan input, and reduce noise while suppressing a decrease in stall resistance.
- FIG. 2 is a cross-sectional view showing the configuration of the indoor unit of the air conditioner provided with the cross-flow fan according to Embodiment 1;
- 1 is a front view of a cross-flow fan according to Embodiment 1;
- FIG. FIG. 4 is a cross-sectional view showing an enlarged outflow area of the cross-flow fan according to the first embodiment;
- 4 is a cross-sectional view showing an enlarged inflow region of the cross-flow fan according to Embodiment 1;
- FIG. FIG. 4 is a cross-sectional view showing an enlarged outflow region of a cross-flow fan of a comparative example;
- FIG. 5 is an enlarged cross-sectional view showing an inflow region of a cross-flow fan of a comparative example;
- FIG. 5 is a diagram showing the shaft output of the cross-flow fan according to Embodiment 1 together with a comparative example;
- FIG. 2 is a cross-sectional view of blades of the cross-flow fan according to Embodiment 1;
- 1A and 1B are a cross-sectional view and an enlarged view of a main part of a cross-flow fan according to Embodiment 1;
- FIG. FIG. 5 is a perspective view of blades in a modification of the cross-flow fan according to Embodiment 1;
- FIG. 5 is a top view of blades in a modification of the cross-flow fan according to Embodiment 1;
- FIG. 1 is a cross-sectional view showing the configuration of an indoor unit of an air conditioner provided with a cross-flow fan.
- FIG. 2 is a front view of the cross-flow fan.
- FIG. 3 is a cross-sectional view showing an enlarged outflow area of the cross-flow fan.
- FIG. 4 is a cross-sectional view showing an enlarged inflow area of the cross-flow fan.
- FIG. 5 is a cross-sectional view showing an enlarged outflow area of the cross-flow fan.
- FIG. 6 is a cross-sectional view showing an enlarged inflow area of the cross-flow fan.
- FIG. 1 is a cross-sectional view showing the configuration of an indoor unit of an air conditioner provided with a cross-flow fan.
- FIG. 2 is a front view of the cross-flow fan.
- FIG. 3 is a cross-sectional view showing an enlarged outflow area of the cross-flow fan.
- FIG. 4 is a cross-sectional view showing an enlarged inflow area of
- FIG. 7 is a diagram showing the shaft output of a cross-flow fan together with a comparative example.
- FIG. 8 is a cross-sectional view of blades of a cross-flow fan.
- FIG. 9 is a cross-sectional view of the cross-flow fan and an enlarged view of its essential part.
- FIG. 10 is a perspective view of blades in a modification of the cross-flow fan.
- FIG. 11 is a top view of blades in a modification of the cross-flow fan.
- a configuration example of an air conditioner will be described as an example of a refrigeration cycle device equipped with a cross-flow fan according to the present disclosure.
- a refrigeration cycle apparatus provided with a cross-flow fan according to the present disclosure other than an air conditioner, for example, a showcase or the like can be cited.
- the air conditioner has a function of blowing air. Therefore, the air conditioner described here is also an example of an air blower equipped with a cross-flow fan according to the present disclosure.
- examples of the blower device including the cross-flow fan according to the present disclosure include a circulator, a tower fan, and the like.
- An air conditioner which is a refrigeration cycle device according to this embodiment, includes an indoor unit 1 shown in FIG. 1 and an outdoor unit (not shown).
- the indoor unit 1 is installed inside a room to be air-conditioned, that is, indoors.
- the outdoor unit is installed outside the room, that is, outdoors.
- the indoor unit 1 and the outdoor unit are connected by a refrigerant pipe (not shown).
- the indoor unit 1 has a cross-flow fan 100 and a heat exchanger 14 .
- the outdoor unit includes an outdoor unit fan, a heat exchanger, a compressor, an expansion valve, a four-way valve, etc., all of which are not shown.
- Refrigerant pipes are circulated between the heat exchanger 14 of the indoor unit 1 and the heat exchanger (not shown) of the outdoor unit. Refrigerant is enclosed in the refrigerant pipe.
- the refrigerant enclosed in the refrigerant pipe is, for example, difluoromethane (CH2F2:R32).
- the refrigerant pipe connects the heat exchanger 14 of the indoor unit 1 and the four-way valve, compressor, heat exchanger and expansion valve of the outdoor unit in an annular fashion. Therefore, a refrigerant circuit is formed in which the refrigerant circulates between the heat exchanger of the indoor unit 1 and the heat exchanger of the outdoor unit.
- the compressor of the outdoor unit is a device that compresses the supplied refrigerant to increase the pressure and temperature of the refrigerant.
- a rotary compressor, a scroll compressor, a reciprocating compressor, etc. can be used for the compressor, for example.
- the expansion valve expands the refrigerant condensed in the heat exchanger of the outdoor unit and reduces the pressure of the refrigerant.
- the heat exchanger 14 of the indoor unit 1 exchanges heat between the refrigerant that has flowed into the heat exchanger 14 and the air around the heat exchanger 14 .
- the cross-flow fan 100 blows indoor air so as to pass around the heat exchanger 14, promotes heat exchange between the refrigerant and the air in the heat exchanger 14, and heats or cools by heat exchange. The filtered air is sent back into the room.
- the heat exchanger of the outdoor unit exchanges heat between the refrigerant that has flowed into the heat exchanger and the air around the heat exchanger.
- the outdoor unit fan blows outdoor air so as to pass around the heat exchanger of the outdoor unit, promoting heat exchange between the refrigerant and the air in the heat exchanger.
- the refrigerant circuit configured in this way exchanges heat between the refrigerant and the air in the heat exchanger 14 of the indoor unit 1 and the heat exchanger of the outdoor unit, respectively. It works as a heat pump to transfer heat between them. At this time, by switching the four-way valve, the circulation direction of the refrigerant in the refrigerant circuit can be reversed to switch between the cooling operation and the heating operation of the air conditioner.
- the indoor unit 1 includes a housing 10.
- the housing 10 is installed indoors.
- a heat exchanger 14 and a cross-flow fan 100 are housed inside the housing 10 .
- a suction port 11 is formed in the upper surface of the housing 10 .
- the suction port 11 is an opening for taking air into the housing 10 from the outside.
- a blowout port 12 is formed on the bottom surface of the housing 10 .
- the air outlet 12 is an opening for discharging air from the inside of the housing 10 to the outside.
- An air passage leading from the suction port 11 to the blowout port 12 is formed inside the housing 10 .
- a filter 13 is installed at the suction port 11 .
- the filter 13 is for removing relatively large dirt, dust, dirt, etc. from the air entering the housing 10 from the suction port 11 .
- a heat exchanger 14 is installed on the leeward side of the filter 13 in the air passage inside the housing 10 .
- the heat exchanger 14 exchanges heat with the air flowing through the air passages in the housing 10 to heat or cool the air flowing through the air passages. Whether the air is heated or cooled depends on whether the air conditioner is in heating operation or cooling operation.
- a cross-flow fan 100 is installed on the leeward side of the heat exchanger 14 in the aforementioned air passage.
- the cross-flow fan 100 is for generating an air flow in the air path inside the housing 10 from the suction port 11 to the blow-out port 12 .
- a rear guide 16 is provided on the rear side of the impeller of the cross-flow fan 100 inside the housing 10 .
- a side wall 15 is provided on the front side of the impeller of the cross-flow fan 100 inside the housing 10 .
- the rear guide 16 is spirally arranged so that the distance from the impeller of the cross-flow fan 100 increases as it goes from the heat exchanger 14 side to the outlet 12 side.
- a side wall 15 on the front side of the impeller of the cross flow fan 100 protrudes in a tongue shape toward the rear side on the side of the blowout port 12 of the impeller.
- a casing of the cross-flow fan 100 is composed of the rear guide 16 and the side wall 15 .
- the impeller of the cross-flow fan 100 is housed inside the casing of the cross-flow fan 100 .
- a wind direction plate 17 is provided at the outlet 12 .
- the wind direction plate 17 is for adjusting the blowing angle of the air blown out from the blowing port 12 .
- the vertical wind direction plate of the wind direction plates 17 is illustrated.
- the indoor unit 1 can change the blowing direction up and down.
- the outlet 12 is also provided with left and right airflow direction plates as the airflow direction plate 17 .
- the left/right airflow direction plate is for adjusting the blowing angle in the left/right direction of the air blown out from the air outlet 12 .
- the cross-flow fan 100 When the cross-flow fan 100 operates, an air flow from the suction port 11 to the blowout port 12 is generated in the air passage, sucking air from the suction port 11 and blowing the air out from the blowout port 12 .
- the air sucked from the suction port 11 becomes an air flow that passes through the air passage inside the housing 10 in order of the filter 13 , the heat exchanger 14 and the cross flow fan 100 and is blown out from the blowout port 12 .
- the wind direction plate 17 arranged on the leeward side of the cross flow fan 100 adjusts the direction of the wind blown out from the outlet 12, ie, the blowing direction.
- the indoor unit 1 of the air conditioner configured as described above blows air into the room.
- the indoor unit 1 can change the temperature and direction of the blown airflow.
- the cross-flow fan 100 includes an impeller 110 and a motor 150.
- the impeller 110 includes a support member 120 , blades 130 and a rotating shaft 140 .
- Motor 150 rotates impeller 110 around rotating shaft 140 .
- the impeller 110 includes a plurality of support members 120.
- the support member 120 is a plate-like member having a circular or annular shape.
- the plurality of support members 120 are arranged at predetermined intervals in a direction parallel to the rotation axis 140 (hereinafter also referred to as the direction of the rotation axis 140).
- a rotating shaft 140 of the impeller 110 is provided through the centers of the circular or annular shape of the plurality of supporting members 120 .
- a plurality of wings 130 are provided between adjacent support members 120 .
- a plurality of wings 130 are provided near the outer circumference of the support member 120 .
- the plurality of wings 130 are aligned along the circumferential direction of the support member 120 at intervals.
- a plurality of blades 130 supported between a pair of support members 120 form a series.
- the impellers 110 of the cross-flow fan 100 are configured such that approximately 7 to 14 impellers are connected in the direction of the rotating shaft 140 .
- FIG. 3 is an enlarged view of an outflow area where air flows out from within the impeller 110 of the cross-flow fan 100 through between the blades 130 .
- FIG. 4 is an enlarged view of an inflow region where air flows into the impeller 110 of the cross-flow fan 100 through between the blades 130.
- FIG. 3 and 4 show cross sections perpendicular to the rotation axis 140 of the blades 130 of the impeller 110.
- FIG. C the cross section C.
- the focused blade 130 is referred to as the concerned blade 130a.
- the blade 130 adjacent to the blade 130a on the counter-rotational direction side is called an adjacent blade 130b.
- An imaginary circle 20 indicated by a dashed line in these figures exists on the outermost side of imaginary circles in contact with both the suction surface 132 of the blade 130a and the pressure surface 131 of the adjacent blade 130b in the cross section C. Yen.
- each of the plurality of blades 130 has a pressure surface 131 and a suction surface 132 as well as an outer peripheral end 133 and an inner peripheral end 134 .
- the pressure side 131 is the side of the blade 130 facing in the direction of rotation.
- the suction surface 132 is the surface of the blade 130 that faces the side opposite to the rotation direction (hereinafter also referred to as the anti-rotation side).
- Outer peripheral edge 133 is the edge of blade 130 furthest from axis of rotation 140 .
- Inner peripheral end 134 is the end of blade 130 closest to axis of rotation 140 .
- the negative pressure surface 132 of each blade 130 is formed with a convex portion 161 that bulges in the counter-rotational direction.
- the protrusion 161 of the blade 130a is provided on the outer peripheral side of the outermost imaginary circle 20 and on the inner peripheral side of the outer peripheral end 133 of the blade 130a.
- the convex portion 161 of the blade 130a and the suction surface 132 of the blade 130a on the inner peripheral side of the convex portion 161 of the blade 130a are connected by a straight portion 162 .
- the straight portion 162 is a tangent line that is in contact with both the convex portion 161 and the negative pressure surface 132 on the inner peripheral side of the convex portion 161 .
- the "conventional blade” indicated by a dashed line in the drawing is an arc connecting the outer peripheral end 133 and the inner peripheral end 134 in the cross section C and overlapping the suction surface 132 on the inner peripheral side of the straight portion 162. be.
- the convex portion 161 according to the present disclosure is formed so as to bulge in the counter-rotational direction from such an arc.
- FIG. 5 and 6 show airflow in a conventional cross-flow fan.
- the suction surface 132 of the blade 130 in the section C has an arc shape.
- FIG. 5 is an enlarged view of an outflow area where air flows out from the cross-flow fan.
- the flow from the inner peripheral side to the outer peripheral side between the blades 130 follows the suction surface 132 of the blade 130 in a region near the inner peripheral end 134 of the blade 130, but As it approaches the end 133 , it separates from the suction surface 132 and forms a vortex at the outer peripheral end 133 .
- FIG. 5 shows airflow in a conventional cross-flow fan.
- the suction surface 132 of the blade 130 in the section C has an arc shape.
- FIG. 5 is an enlarged view of an outflow area where air flows out from the cross-flow fan.
- the flow from the inner peripheral side to the outer peripheral side between the blades 130 follows the suction surface 132 of the blade 130 in a region near the inner peripheral end 134 of the
- FIG. 6 is an enlarged view of an inflow region into which air flows from the cross-flow fan.
- the flow entering between the blades 130 from the outer peripheral side of the blade 130 grazes the outer peripheral edge 133 of the blade 130 and separates from the suction surface 132 in a region close to the outer peripheral edge 133 .
- a vortex is formed in the middle region of the pressure surface 132 .
- the blade thickness on the suction surface 132 side on the outer peripheral side of the blade 130 can be increased.
- the suction surface 132 side on the outer peripheral side where the flow between the blades 130 separates from the suction surface 132 by increasing the blade thickness on the suction surface 132 side on the outer peripheral side of the blade 130 can be gradual, so that the flow between the blades 130 can follow the blade surface (suction surface 132) in both the inflow region and the outflow region to reduce separation. .
- the separation of the flow from the negative pressure surface 132 between the blades 130 it is possible to reduce the draft resistance and reduce the fan input.
- the inner peripheral side of the negative pressure surface 132 and the convex portion 161 are smoothly connected by a straight portion 162 that is a tangent line to each other. Therefore, the flow between the blades 130 can smoothly flow from the outer peripheral side to the inner peripheral side in the inflow region and from the inner peripheral side to the outer peripheral side in the outflow region, thereby reducing the draft resistance between the blades 130. Fan input can be reduced, fan input can be reduced. Furthermore, the convex portion 161 is provided on the inner peripheral side of the outer peripheral end 133 . Therefore, the exit angle of the blade 130, that is, the installation angle on the outer peripheral side, does not increase, so that the outflow to the upstream side of the casing does not increase, and a decrease in stall strength can be suppressed.
- the separation of the airflow between the blades 130 is reduced while the stall resistance is maintained, and the relative speed of the airflow between the blades 130 is reduced.
- the resistance is reduced, and the input of the fan can be reduced.
- noise caused by separation at the leading edge of the blade 130 can be reduced. Therefore, it is possible to improve fan efficiency, reduce fan input, and reduce noise while suppressing a decrease in stall resistance.
- FIG. 7 shows the shaft output of the motor 150 of the cross-flow fan 100 according to this embodiment, that is, the shaft input of the impeller 110.
- FIG. 7 comparison is made with the conventional example at the same air volume.
- the shaft output required to obtain the same air volume is lower than that of the conventional example.
- the plurality of blades 130 forming the above-described single series of the impeller 110 may be arranged at equal pitches in the circumferential direction, or may be arranged at uneven pitches in the circumferential direction. may be arranged in When the blades 130 are arranged at an equal pitch in the circumferential direction, in other words, the circumferential intervals of the blades 130 in one series are the same. When the blades 130 are arranged at uneven pitches in the circumferential direction, in other words, the blades 130 in one series have different circumferential intervals.
- the blade thickness of the convex portions 161 of the blades 130 may be changed according to the pitch. As shown in FIG. 8, let t be the thickness in the direction perpendicular to the pressure surface 131 at the point where the convex portion 161 of the blade 130 swells most in the anti-rotation direction. In a series of blades 130, the thickness t of the blade 130a is increased as the pitch, that is, the circumferential interval between the blade 130a and the adjacent blade 130b is increased.
- the convex portion 161 has a pitch, that is, the circumferential interval between the blade 130a and the adjacent blade 130b, which is larger than the average pitch, that is, the average value of the circumferential intervals of the blades 130. 130. Further, among the series of blades 130, the blades 130 having a smaller pitch than the average pitch are not provided with the protrusions 161.
- FIG. 1 In this way, by not providing the protrusions 161 on the narrow-pitch blades 130 and providing the protrusions 161 on the wide-pitch blades 130, an increase in pressure loss in the flow path between the blades 130 can be suppressed. At the same time, it is possible to reduce peeling and further reduce the input power of the fan.
- the convex portion 161 is provided not over the entire width of the suction surface 132 of the blade 130 but partially in the direction of the rotating shaft 140 .
- the suction surface 132 of the blade 130 is alternately divided into first regions 171 and second regions 172 in the rotation axis 140 direction.
- the convex portion 161 is provided in the first region 171 .
- the projection 161 is not provided in the second region 172 .
- the first region 171 provided with the convex portion 161 and the second region 172 without the convex portion 161 are present.
- a change in the relative velocity of the airflow between the blades 130 can occur in the direction of the axis of rotation 140 of the blades 130 .
- the ability to change the relative velocity of the airflow between the blades 130 creates turbulence in the airflow, reduces the separation of the airflow from the blade surface, reduces the relative velocity of the airflow between the blades 130, and reduces pressure loss. It is possible to reduce the input power of the fan further.
- the widths of the protrusions 161 provided in the first region 171 in the direction of the rotating shaft 140 are L1, L2, and L3 in ascending order of the thickness of the portion of the inner peripheral end 134 . In this case, L1, L2, and L3 satisfy the relationship of the following formula (1).
- the gap between the blade 130a and the adjacent blade 130b is relatively wide, while at locations where the thickness of the portion of the inner peripheral end 134 is large, the blade 130a and the adjacent blade 130b becomes relatively narrow.
- the separation is small, but the flow path is narrow and the pressure loss due to the protrusions 161 is likely to increase.
- the separation is large, but the flow path is wide and the pressure loss due to the projections 161 is less likely to increase. Therefore, in the modification shown in FIG.
- the region of the convex portion 161 is widened at the portion where the thickness of the inner peripheral end portion 134 is small, and the region of the convex portion 161 is widened at the portion where the thickness of the inner peripheral end portion 134 is large. Narrow.
- the area of the convex portion 161 is widened in the portion where the flow path between the blades 130 is narrow, and the area of the convex portion 161 is narrowed in the portion where the flow path between the blades 130 is wide.
- the present disclosure is provided between a plurality of support members arranged at predetermined intervals in the rotation axis direction and adjacent support members, arranged near the outer periphery of the support members and spaced apart in the circumferential direction.
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Abstract
Description
図1から図11を参照しながら、本開示の実施の形態1について説明する。図1はクロスフローファンを備えた空気調和機の室内機の構成を示す断面図である。図2はクロスフローファンの正面図である。図3はクロスフローファンの流出領域を拡大して示す断面図である。図4はクロスフローファンの流入領域を拡大して示す断面図である。図5はクロスフローファンの流出領域を拡大して示す断面図である。図6はクロスフローファンの流入領域を拡大して示す断面図である。図7はクロスフローファンの軸出力を比較例とともに示す図である。図8はクロスフローファンの翼の断面図である。図9はクロスフローファンの断面図とその要部拡大図である。図10はクロスフローファンの変形例における翼の斜視図である。図11はクロスフローファンの変形例における翼の上面図である。
10 筐体
11 吸込口
12 吹出口
13 フィルタ
14 熱交換器
15 側壁
16 リアガイド
17 風向板
20 仮想円
100 クロスフローファン
110 羽根車
120 支持部材
130 翼
130a 当該翼
130b 隣接翼
131 正圧面
132 負圧面
133 外周端
134 内周端
140 回転軸
150 モータ
161 凸部
162 直線部
171 第1領域
172 第2領域
Claims (6)
- 回転軸方向に予め設定された間隔で配置され、円形又は円環形の平板状を呈する複数の支持部材と、
隣り合う前記支持部材の間に設けられ、前記支持部材の外周寄りで、かつ、周方向に間隔をあけて配置された複数の翼と、を備え、
それぞれの前記翼は、回転方向側の正圧面と反回転方向側の負圧面とを有し、
前記翼の前記負圧面には、前記反回転方向側へ膨らんだ凸部が形成され、
前記回転軸に垂直な断面において、
前記翼の前記凸部は、当該翼の前記負圧面と当該翼の前記反回転方向側に隣接する前記翼の前記正圧面との両方に接する仮想的な円のうちで最も外周側の円よりも外周側で、かつ、当該翼の外周端よりも内周側に設けられ、
前記凸部と前記凸部よりも内周側の前記負圧面とは直線部で接続され、
前記直線部は、前記凸部と前記凸部よりも内周側の前記負圧面との両方に接する接線であるクロスフローファン。 - 前記翼の周方向の間隔には、異なる距離が混在し、
前記回転軸に垂直な断面において、前記翼の前記凸部が最も前記反回転方向に膨らんだ箇所における前記正圧面に垂直な方向の厚みは、当該翼と当該翼の前記反回転方向側に隣接する前記翼との周方向の間隔が大きいほど大きい請求項1に記載のクロスフローファン。 - 前記翼の周方向の間隔には、異なる距離が混在し、
前記凸部は、前記翼のうちで、当該翼と当該翼の前記反回転方向側に隣接する前記翼との周方向の間隔が、前記翼の周方向の間隔の平均値より大きい前記翼に設けられる請求項1又は請求項2に記載のクロスフローファン。 - 前記凸部は、前記回転軸方向における一部に設けられる請求項1から請求項3のいずれか一項に記載のクロスフローファン。
- 前記翼の前記負圧面は、前記回転軸方向において交互に第1領域と第2領域とに区画され、
前記凸部は、前記第1領域に設けられる請求項4に記載のクロスフローファン。 - 前記翼の内周端部は、前記回転軸方向の一方から他方にいくに従って次第に厚みが小さくなり、
前記第1領域の前記回転軸方向における幅は、前記内周端部の厚みが小さいほど大きい請求項5に記載のクロスフローファン。
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EP21964674.2A EP4435263A1 (en) | 2021-11-16 | 2021-11-16 | Cross flow fan |
JP2023561951A JPWO2023089658A1 (ja) | 2021-11-16 | 2021-11-16 | |
CN202180103596.6A CN118176363A (zh) | 2021-11-16 | 2021-11-16 | 横流风扇 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10299694A (ja) * | 1997-04-22 | 1998-11-10 | Toshiba Corp | 送風機 |
JP2009127875A (ja) * | 2007-11-20 | 2009-06-11 | Hitachi Appliances Inc | 空気調和機 |
WO2012169100A1 (ja) * | 2011-06-10 | 2012-12-13 | 三菱電機株式会社 | 空気調和機 |
WO2014080899A1 (ja) * | 2012-11-22 | 2014-05-30 | 三菱電機株式会社 | 空気調和機 |
-
2021
- 2021-11-16 EP EP21964674.2A patent/EP4435263A1/en not_active Withdrawn
- 2021-11-16 CN CN202180103596.6A patent/CN118176363A/zh active Pending
- 2021-11-16 WO PCT/JP2021/042057 patent/WO2023089658A1/ja active Application Filing
- 2021-11-16 JP JP2023561951A patent/JPWO2023089658A1/ja not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10299694A (ja) * | 1997-04-22 | 1998-11-10 | Toshiba Corp | 送風機 |
JP2009127875A (ja) * | 2007-11-20 | 2009-06-11 | Hitachi Appliances Inc | 空気調和機 |
WO2012169100A1 (ja) * | 2011-06-10 | 2012-12-13 | 三菱電機株式会社 | 空気調和機 |
WO2014080899A1 (ja) * | 2012-11-22 | 2014-05-30 | 三菱電機株式会社 | 空気調和機 |
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