CN114072585A

CN114072585A - Air blower

Info

Publication number: CN114072585A
Application number: CN202080041804.XA
Authority: CN
Inventors: 藤井秀纪
Original assignee: Richmond Co ltd
Current assignee: Richmond Co ltd
Priority date: 2019-07-01
Filing date: 2020-04-15
Publication date: 2022-02-18
Also published as: JP2021008849A; WO2021002082A1; JP7004687B2; TW202102780A; KR20220024119A; TWI844664B

Abstract

The invention provides a blower capable of blowing various wind, the blower (1) is provided with: a first movable impeller (4) for generating wind in an axial flow direction; a second rotor blade (5) which has the same rotation axis as the first rotor blade (4), is disposed downstream of the first rotor blade (4), and generates wind in a centrifugal direction by driving the first rotor blade (4) in a counter-rotating manner; and a control unit for changing and controlling the ratio of the number of revolutions of the first rotor impeller (4) to the number of revolutions of the second rotor impeller.

Description

Air blower

Technical Field

The present invention relates to a double inversion type blower.

Background

Conventionally, a double-reverse blower (fan) including two moving blades has been disclosed. For example, the double reverse blower disclosed in patent No. 5709921 includes a first impeller and a second impeller that rotate in different directions from each other, and switches between a 1 st blowing state and a 2 nd blowing state by a rectification effect, the 1 st blowing state being a state in which the flow of air is concentrated in the axial flow direction; the 2 nd blowing state is a state in which the number of revolutions of the first rotor impeller is changed so that the blowing amount is smaller than that in the 1 st blowing state and the flow rectification effect is small.

Disclosure of Invention

However, in the blower disclosed in patent No. 5709921, switching from the 1 st blowing state to the 2 nd blowing state is to reduce the number of rotations of the first impeller while maintaining the number of rotations of the second impeller, and therefore, although the rectifying effect is reduced, the amount of air blown in conjunction therewith is reduced, and it is difficult to blow out air of various textures.

The present invention has been made in view of the above problems, and an object thereof is to provide a blower capable of blowing various winds.

The blower of the present invention is characterized by comprising: a first movable impeller for generating wind in an axial flow direction; a second rotor blade having the same rotation shaft as the first rotor blade, disposed downstream of the first rotor blade, and configured to generate a wind in a centrifugal direction by driving the first rotor blade to rotate in reverse; and a control unit for changing and controlling a rotation ratio between the first rotor impeller and the second rotor impeller.

According to the present invention, a blower capable of blowing various winds can be provided.

Drawings

Fig. 1 is a front perspective view of a blower according to an embodiment of the present invention.

Fig. 2 is a rear side perspective view of the blower according to the embodiment of the present invention.

Fig. 3 is a perspective view of the first and second impeller of the blower according to the embodiment of the present invention.

Fig. 4 is a schematic view of a second movable impeller according to an embodiment of the present invention, where (a) is a front view and (b) is a sectional view taken along IV-IV of the second fan blade in fig. 4 (a).

Fig. 5 is a block diagram of a blower according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of the number of revolutions of the first rotor blade and the second rotor blade according to the embodiment of the present invention.

Fig. 7 is a schematic plan view of the blowing angle of the blower according to the embodiment of the present invention, where (a) is an example of transmitting straight air and (b) is an example of transmitting diffused air.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of a blower 1. The blower 1 of the present embodiment can be used as a fan or a circulator. The blower 1 includes a head 2 and a support 3 supporting the head 2. The head 2 is formed by an upstream impeller cover 21 and a downstream impeller cover 22 to have a substantially cylindrical overall outer shape. In the following description of the blower 1, the first movable impeller 4 side is referred to as rear, the opposite side is referred to as front, the left side when the front is viewed from the rear is referred to as left, and the opposite side is referred to as right. The head 2 side is referred to as the upper side, and the opposite side is referred to as the lower side.

The impeller cover 21 and the impeller cover 22 are formed in a cylindrical shape having a substantially circular bottom portion on the axis a. In the interior of the head 2, the first impeller 4 is disposed on the upstream side, and the second impeller 5 is disposed on the downstream side.

As shown in fig. 2, an upstream grill 211 is formed in a slightly circular annular region at the rear of the impeller cover 21. Further, a side grating 212 is formed on each of the left and right sides of the curved region of the cylindrical side surface of the impeller cover 21. The upstream grill 211 is formed by a plurality of louvers extending upward and downward, and the side grill 212 is formed by a plurality of louvers extending forward and rearward. The upstream grill 211 and the side grill 212 function as air inlets.

A downstream grill 221 is also formed in a substantially circular annular region in a front portion of the impeller cover 22 shown in fig. 1. Further, a lateral grating 222 is formed on each of the left and right sides of the cylindrical side surface of the impeller cover 22. The downstream grill 221 is formed by a plurality of flow straightening plates extending to the left and right, and the side grill 222 is formed by a plurality of flow straightening plates extending to the front and rear. Accordingly, the flow straightening plates of the downstream louver 221 and the

side louvers

222 and 212 are formed in a parallel direction with respect to the axis a, and the flow straightening plate of the upstream louver 211 is formed in a perpendicular direction with respect to the axis a. The downstream grill 221 and the side grill 222 are configured as exhaust ports.

In the head 2, the first impeller 4 and the second impeller 5 are arranged so as to align their rotation axes. The rotation shafts of the first impeller 4 and the second impeller 5 are substantially aligned with the centers of the upstream grill 211 and the downstream grill 221 on the axis a.

The support portion 3 has: a leg portion 31 connected to the head portion 2 and extending downward; and a substantially disk-shaped mounting portion 32 connected to the lower end side of the leg portion 31 and supporting the entire blower 1.

Fig. 3 is a schematic view of the first impeller 4 and the second impeller 5. A motor, not shown, for driving the first impeller 4 and the second impeller 5 is disposed between the first impeller 4 and the second impeller 5. When the front surface of the blower 1 is viewed in the direction of the axis a, the first movable impeller 4 rotates in a first direction R1 which is a counterclockwise direction. The first rotor blade 4 has 7 first blades 42 provided on the outer periphery of a bottomed cylindrical hub 41. The first rotor blade wheel 4 mainly functions as an axial fan for exhausting air sucked from the rear in the direction of the axis a toward the front side.

Fig. 4(a) is a front view of the second impeller 5, and fig. 4(b) is a sectional view IV-IV obtained by cutting the second fan blades 52 of fig. 4(a) in the direction around the axis a.

The second movable impeller 5 rotates in a second direction R2 which is a clockwise rotation direction opposite to the first direction R1. The second impeller 5 has 9 second blades 52 provided on the outer periphery of a bottomed cylindrical hub 51. In the front view of fig. 4(a), the base 521 side of the second segment 52 extends from the axis a side outward in the radial direction R3. The second fan blade 52 is formed in a plate shape that is bent toward the first direction R1 as a whole. Further, the end 522 of the second fan blade 52 is slightly curved in the second direction R2. In this manner, the second impeller 5 is shaped as a centrifugal fan in a front view.

As shown in fig. 4(b), the second blade 52 is slightly inclined such that the surface on the second direction R2 side faces the front surface side of the second impeller 5, as viewed in the cross section of the second blade 52. The inclination angle of the second segment 52 is set to a shallow angle with respect to the axis a (rotation axis), for example, 45 degrees or less. The upstream end 523 of the second vane 52 receiving the air supplied from the first moving impeller 4 is bent in the second direction R2. The downstream end 524 side of the second fan blade 52 is formed in a substantially flat plate shape. Thus, the second impeller 5 is shaped as an axial flow fan in a cross-sectional view.

As described above, the second rotor blade 5 disposed coaxially on the downstream side of the first rotor blade 4 can mainly suck the wind transmitted from the first rotor blade 4 behind, and generate the wind of the centrifugal direction component that exhausts toward the outside of the radial direction R3 with the axis a as the center. On the other hand, the second rotor blades 5 are slightly inclined with respect to the axis a, and therefore, although they have less components than those in the centrifugal direction, they can output wind having components in the axial flow direction (the direction of the axis a).

Next, a block diagram of the blower 1 will be described with reference to fig. 5. The control unit 11 changes and controls the ratio of the number of revolutions of the first moving impeller 4 to the number of revolutions of the second moving impeller 5. The blower 1 has: a control unit 11, a drive unit 12, a communication unit 13, and a storage unit 14. The driving unit 12 drives motors such as the first impeller 4 and the second impeller 5 of the blower 1. The communication unit 13 transmits and receives signals by a remote controller of the blower 1, not shown, or by radio waves such as infrared rays.

The storage unit 14 stores an air volume 141, an air quality 142, and a revolution table 143 defining the number of revolutions of the first rotor blade 4 and the second rotor blade 5. The storage unit 14 stores a setting value of "ON" or "OFF" as the natural wind flag 144.

In the present embodiment, any one of values "1" to "9" is set as the air volume 141 and the wind quality 142, respectively. The set values of the air volume 141 and the air quality 142 are set according to an instruction from a remote controller.

The revolution table 143 stores the number of revolutions of the first rotor blade 4 and the second rotor blade 5 in advance in accordance with the combination of the set values of the air volume 141 and the wind quality 142. The controller 11 refers to the revolution table 143 to determine the number of revolutions of the first impeller 4 and the second impeller 5 corresponding to the set values of the air volume 141 and the wind quality 142. Then, the control unit 11 drives the first moving impeller 4 and the second moving impeller 5 by the driving unit 12 based on the obtained rotation number.

The natural wind flag 144 stores a value of "ON (valid)" or "OFF (invalid)" upon receiving a change instruction from the remote controller by the communication unit 13. When the natural wind flag 144 is "OFF", the first impeller 4 and the second impeller 5 are driven in a steady state at a rotation speed corresponding to the set values of the wind volume 141 and the wind quality 142. ON the other hand, when the natural wind flag 144 is "ON", the control unit 11 drives the first impeller 4 so as to change the number of revolutions of the second impeller 5 with time while setting the number of revolutions of the first impeller 5 to a constant value.

Next, an example of setting the number of rotations of the first rotor blade 4 and the second rotor blade 5 will be described. Fig. 6 is a schematic diagram showing changes in the number of revolutions of the first impeller 4 and the second impeller 5 when the wind quality 142 is changed from "1" to "9" when the wind volume 141 is set to "8". In fig. 6, the vertical axis represents the number of revolutions in rpm, and the horizontal axis represents the set value of the wind mass 142.

The number of revolutions of the first impeller 4 shown by a solid line is set to be monotonously reduced from the wind quality "1" to the wind quality "9". The decrease in the number of revolutions when the wind quality "1" is changed to wind quality "2" is larger than the decrease in the number of revolutions when the set value is increased by one step from wind quality "2" to wind quality "5". In addition, the decrease amount of the number of revolutions when the set value is increased by one step in the wind quality "2" to "5" is larger than the decrease amount of the number of revolutions when the set value is increased by one step in the wind quality "5" to "9". In this way, the amount of air blown in the axial flow direction by the first impeller 4 is reduced from the wind quality "1" to the wind quality "9".

On the other hand, the number of revolutions of the second impeller 5 shown by the broken line is slightly reduced when the wind quality "1" is changed to the wind quality "2", and the wind quality "2" to the wind quality "5" is the same set value. In addition, the number of revolutions of the second impeller 5 is set to increase from the wind quality "5" to the wind quality "9". When the wind quality "1" is changed to the wind quality "2", the reduction width of the second impeller 5 is set to be smaller than the reduction width of the first impeller 4.

In addition, in the wind masses "1" to "4", the number of revolutions of the first impeller 4 is greater than the number of revolutions of the second impeller 5. In the wind masses "6" to "9", the number of revolutions of the first impeller 4 is greater than the number of revolutions of the second impeller 5.

Thus, the ratio of the number of revolutions of the first impeller 4 to the second impeller 5 monotonously decreases from the wind quality "1" to the wind quality "9". Accordingly, as the wind quality changes from "1" to "9", the component in the axial flow direction of the wind output from the blower 1 decreases and the component in the centrifugal direction increases, and the wind can be changed to the diffused wind having a wide wind blowing range from the direct wind having high directivity and reaching a long distance. The fan 1 can change the wind quality 142 to arbitrarily change the diffusion angle in a plurality of stages.

When the air volume 141 is changed, the number of rotations of the first rotor blade 4 and the second rotor blade 5 as a whole can be increased or decreased. When the air volume 141 is increased or decreased, the number of revolutions of both the first impeller 4 and the second impeller 5 may be increased or decreased. Thus, the blowing distance can be changed while maintaining the same diffusion angle.

Fig. 7(a) and 7(b) are schematic diagrams showing blowing angles when the blower 1 outputs straight air and when the blower 1 outputs diffused air, respectively, as viewed in a plan view. In the straight intake air of fig. 7(a), the wind mass 142 is set to "1", for example. In the diffused wind of fig. 7(b), for example, in the wind quality "9", the wind angle may be set to about 120 °. In the state of the wind quality "5", the rotation numbers of the first impeller 4 and the second impeller 5 are set to the same value, and the component in the axial flow direction and the component in the centrifugal direction coexist to the same degree, and referring to fig. 6(a), the wind of the blower 1 is output to the reaching distance and the angular range between the wind quality "1" and the wind quality "9".

Further, as shown in fig. 1 and 2, since the wind output from the fan 1 is discharged from the downstream grill 221 and the side grill 222 having the flow regulating plates in the left-right direction or the front-back direction, the diffusion in the up-down direction can be suppressed. Accordingly, the fan 1 can adjust the spreading angle in the left-right direction mainly around the axis a by changing the wind mass 142.

The second impeller 5 of the present embodiment is driven so as to rotate in the opposite direction to the first impeller 4. Therefore, the second impeller 5 can increase the proportion of the axial flow direction component, which is the wind output by the fan 1, against the component in the rotational direction (rotational direction about the axis a) generated by the first impeller 4. Even if the wind quality in which the straight wind is generated is "1", the second impeller 5 is driven at a low rotation speed, and therefore, can be driven in opposition to the component in the rotation direction generated by the first impeller 4.

In addition, when the air volume 141 is increased or decreased, the number of revolutions of one of the first impeller 4 and the second impeller 5 may be increased or decreased, and at least one of the first impeller 4 and the second impeller 5 having a higher number of revolutions may be controlled. This makes it easy to detect a change in the blowing distance or the diffusion angle.

In the example of the air volume "8" in fig. 6, the second impeller 5 sets the number of revolutions of the wind quality "1" to be slightly larger than the wind quality "2", and therefore, the obstruction of the wind output from the first impeller 4 by the second impeller 5 rotating at a low speed can be reduced.

Next, the natural wind mode will be described. When the natural wind flag 144 of the blower 1 is switched to "ON", the blower 1 can be controlled in a natural wind mode in which the first impeller 4 or the second impeller 5 is changed with time in accordance with the number of revolutions calculated by the undulation generation process.

For example, the control unit 11 may control the rotation number of the first impeller 4 to change with time by an intermittent chaos (intermittent chaos) method in the natural wind mode. In the natural wind mode, for example, as indicated by the increase/decrease widths W1, W2 of the wind quality "3" and the wind quality "8", the number of revolutions of the first impeller 4 can be changed around the number of revolutions of the first impeller 4 corresponding to the set values of the current air volume 141 and the wind quality 142. The increase/decrease width of the rotation speed of the first impeller 4 in the natural wind mode may be set to be smaller than the width W0 of the maximum value N1 and the minimum value N2 of the rotation speed when the wind mass 142 is changed from "1" to "9". The width of increase or decrease in the number of revolutions of the first impeller 4 may be set to be equal to or greater than the width W0.

In this way, the blower 1 changes the intensity of the wind around the number of revolutions of the first and second impellers 4 and 5 set by the user, and can output natural wind.

In the natural wind mode, the number of revolutions of the second rotor blade 5 may be controlled to be increased or decreased, or the number of revolutions of both the first rotor blade 4 and the second rotor blade 5 may be controlled to be increased or decreased.

The above description has been made of the blower 1 including the first movable impeller 4 for generating wind in the axial flow direction, the second movable impeller 5, and the control unit 11; the second rotor blade 5 has the same axis as the rotation shaft of the first rotor blade 4, is disposed downstream of the first rotor blade 4, and generates wind in a centrifugal direction by driving the first rotor blade 4 to rotate in reverse; the control unit 11 changes and controls the ratio of the number of revolutions of the first moving impeller 4 to the number of revolutions of the second moving impeller 5.

Thus, compared to a blower using one impeller, the static pressure and the straightness can be improved because the rotating component generated by the first impeller 4 on the upstream side is offset by the second impeller 5 on the downstream side to reduce the rotating component. Further, when the number of rotations of the first impeller 4 on the upstream side is increased and the number of rotations of the second impeller 5 on the downstream side is decreased, the reaching distance of the straight wind can be increased. Further, when the rotation speed of the first rotating impeller 4 is reduced to reduce the rotational component and the rotation speed of the second rotating impeller 5 is increased, the centrifugal wind is generated, and the fan 1 mainly generating the diffused wind is configured.

Since the second impeller 5 has a shape that functions as a centrifugal fan, the fan 1 can be configured to have properties sufficient to change the straight movement and the diffusion together with the first impeller 4. In addition, by changing the rotation ratio of the double reverse rotation type in time series, the direct wind and the diffused wind can be changed to deliver the natural wind.

The embodiments of the present invention have been described above, but the embodiments are only shown as examples, and are not intended to limit the scope of the invention. The new embodiments may be implemented in other various forms, and various omissions, substitutions, and changes may be made without departing from the spirit of the invention. The embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

In the description of the present embodiment, the case where the user transmits the set values of the wind quality and the air volume "1" to "9" by operating the remote controller or the like and controls the values as they are is described as an example, but in addition to this, the wind quality (the number of rotations of the first movable impeller 4 and the second movable impeller 5), the air volume (the number of rotations of the first movable impeller 4 and the second movable impeller 5), the fan head swing setting corresponding to the air blowing range may be stored in the storage unit 14 or the like in advance, and when the air blowing range is designated by the user, the fan head swing setting of the head 2 and the number of rotations of the first movable impeller 4 and the second movable impeller 5 are read and controlled by the blower 1. The user can specify the air blowing range by using a communication terminal such as a remote controller capable of communicating with the air blower 1.

Further, the blower 1 may perform rotation control of the head 2 in either one of the vertical direction and the horizontal direction or a combination of both directions as setting of the fan head swing. The blower 1 may control the fan head swing angle of the head 2 or the center angle of the fan head swing so as to correspond to the blowing range.

Further, the blower 1 may be configured to automatically control to send the wind to the user within the range. As for the range of the user, for example, the blower 1 or an external device connected to the blower 1 may be provided with a detection means such as a camera or an infrared sensor, and the blower 1 may determine the range of the user, for example, an angle or a distance, with respect to the blower 1 by using the detection means. Alternatively, the blower 1 may communicate with a communication terminal such as a smart phone or a smart watch held by the user, and detect the presence range. The blower 1 can set the determined range of the user as a blowing range, and control the air volume, the quality of the wind, and the swing of the fan head.

The air volume 141 and the air quality 142 set in the storage unit 14 of the blower 1 may be set to 10 steps or more, respectively. This allows the blower 1 to blow a wider variety of wind.

Further, although the downstream grill 221 configured as the exhaust port is formed in the annular region having the plurality of flow regulating plates on the left and right sides, a circular region in which the flow regulating plates are deformed in the direction may be included on the axis a inside the annular region. The circular flow regulating plate may be formed in a radial shape, for example.

The blower 1 may be automatically controlled by a user by setting a highly possible wind quality, a highly possible wind volume, and a highly possible fan head swing operation in advance according to various use conditions shown in the following (1) to (5). After the automatic control, if the user changes some or all of the settings of the wind quality, the wind volume, and the fan head swing operation, the control unit 11 stores the changed settings in, for example, the storage unit 14, and the same usage status is reflected in the automatic control next time.

(1) For example, when the blower 1 is used by supplying power from a USB power source of an electronic device such as a computer, it is possible to determine that the user should be present in the vicinity of the USB power source in such a use situation, and therefore the user is highly likely to want a narrow range of wind. Accordingly, the blower 1 can send out wind in a narrow range targeted for users of one or more people near the room or the like. On the other hand, when the blower 1 is used by supplying power from a rechargeable battery (secondary battery), there is a high possibility that the user needs to use the blower 1 in a place away from the power supply, and a wide range of wind is desired. Accordingly, the blower 1 can send a wide range of wind directed to one or more users at a distance. The narrow range or the wide range can be set according to the wind quality, the wind volume, and the range of the fan head swing operation.

(2) The blower 1 may be provided with a detachable handle for easy carrying at an appropriate position such as the front, rear, side, or upper top of the impeller covers 21 and 22, or the support portion 3. When the user uses the blower 1 with the handlebar attached, the blower 1 can send out wind in a narrow range targeted for one or more users in the vicinity of the room or the like because there is a high possibility that the user wants to blow out wind in a narrow range. On the other hand, when the user removes the handle and uses the blower 1, since there is a high possibility that a wide range of wind is desired to be blown out, the blower 1 can transmit a wide range of wind targeted for one or more users at a distance.

(3) The blower 1 may be mounted with a brightness sensor to determine the brightness of the surroundings and may be configured to change the wind to be blown according to the brightness. For example, since there is a high possibility that a user is in a sleep mode and desires a wide-range weak wind, when the light/dark sensor detects that the light-receiving signal level is low, the blower 1 can send the wide-range weak wind to avoid hindering the sleep mode of the user.

(4) The blower 1 may be connected to an external device such as an indoor air conditioner or humidifier by wireless or wired connection via the communication unit 13 to acquire an operation state, and may perform blower control in accordance with the operation state. For example, when the user uses the blower 1 for the purpose of circulating air indoors, strong wind is highly likely to be desired, and therefore, when the blower 1 detects that the external device in the room is operating through the communication unit 13, the strong wind can be blown.

(5) The blower 1 may be configured to detect a sensible temperature of a user in the surrounding environment. For example, the blower 1 includes a thermometer, a hygrometer, an anemometer, a sunshine meter (insolometer), and the like therein, or is connectable to the outside, and obtains a sensible temperature from the detected air temperature, humidity, air speed, sunshine amount, and the like. The blower 1 may acquire information such as air temperature, humidity, wind speed, and solar radiation amount for obtaining a sensible temperature from an external terminal. Since there is a high possibility that strong wind is desired when the user is in an environment with a high sensible temperature, strong wind blowing is possible when the sensible temperature of the surrounding environment determined by the blower 1 is high.

Description of the symbols

1 blower 2 head

3 support part 4 first movable impeller

5 second impeller 11 control part

12 drive unit 13 communication unit

14 storage part 21 moving impeller cover

22 moving impeller cover 31 foot

32-carrying part 41 hub

42 first fan blade 51 hub

52 second fan 141 air volume

142 wind quality 143 revolution meter

144 natural wind flag 211 upstream grille

212 side grid 221 downstream grid

222 side grating 521 base

522 upstream of end 523

524 downstream end

Maximum value of A-axis N1

N2 minimum R1 first direction

R2 second direction R3 radial

W0 amplitude W1 and W2 increase and decrease amplitudes.

Claims

1. A blower is characterized by comprising:

a first movable impeller for generating wind in an axial flow direction;

a second rotor blade having the same axis as that of a rotating shaft of a first rotor blade, disposed downstream of the first rotor blade, and configured to generate wind in a centrifugal direction by being driven in a counter-rotating manner with respect to the first rotor blade;

and a control unit for changing and controlling a rotation ratio between the first movable impeller and the second movable impeller.

2. The blower of claim 1,

when the air volume is increased or decreased, the control unit controls the one of the first and second movable impellers having the higher rotation number.

3. The blower according to claim 1 or 2,

the blades of the second rotating impeller are provided on the outer periphery of the hub of the second rotating impeller, and are inclined at an angle of 45 degrees or less with respect to the rotating shaft in a cross-sectional view.

4. The blower of claim 3,

the fan blade is curved entirely in a first direction, which is a rotation direction of the first rotor blade, in a front view, and an upstream end on the first rotor blade side is curved in a second direction, which is a rotation direction of the second rotor blade, in a cross-sectional view.

5. The blower according to any one of claims 1 to 4,

the control unit fixes the rotation speed of the second impeller and changes the rotation speed of the first impeller with time according to the rotation speed calculated by the undulation generation process.