JP5025583B2 - Blower and humidifier - Google Patents

Description

  The present invention relates to a blower that generates an air flow in a direction along the axis of the housing in a cylindrical housing, and a humidifier equipped with the blower.

  In recent years, with the increase in health orientation, humidifiers that give moderate humidity to indoor air have been widely used.Especially, vaporizing humidifiers that achieve humidification without water evaporation are used at room temperature. Since the humidity can be adjusted without changing the temperature, its spread is expanding.

  In the vaporizing humidifier, a humidifying filter impregnated with water is disposed along with a blower fan inside a blower passage connecting an intake port and an air feed port. In this humidifier, the air introduced into the air passage from the air inlet by the operation of the blower fan is passed through the humidification filter to be humid air containing vaporized water, and the humid air is disposed downstream of the humidification filter. Send out and send it out (inside the room) through the air inlet.

Recently, there is an increasing demand for humidifiers that supply a large amount of moisture indoors. For this reason, a humidifier has been proposed that uses an axial fan as a blower fan to obtain a large amount of air and sends a large amount of humid air indoors to meet the demand for improvement in humidification performance (see Patent Document 1). .
JP 2000-356373 A

In order to further improve the humidification performance using the humidifier described in Patent Document 1, the diameter of the impeller of the axial fan is increased or the axial fan is rotated at a high rotational speed. It is possible to increase the air volume.
However, when the diameter of the impeller of the axial flow fan is increased, the diameter of the housing that accommodates the axial flow fan is also increased, resulting in a problem that the humidifier becomes large. Further, when the axial fan is rotated at a high rotational speed, there arises a problem that the operation sound of the humidifier increases.

  The present invention has been made in view of such circumstances, and provides a blower device that can reduce operating noise and obtain a large air volume without increasing the size, and meets the demand for improvement in humidification performance by using this blower device. An object is to provide a humidifier to obtain.

A blower device according to the present invention is a blower device that generates airflow in a cylindrical housing and blows air in a direction along an axial center, and a plurality of impellers having axial flow blades are coaxially arranged in the housing. to Yes in parallel, the diameter of one impeller is positioned on the upstream side of the impeller, rather smaller than the diameter of the phase Tonariru other impeller to the impeller, of the one The axial flow blades of the impeller and other impellers are twisted in opposite directions .

In the present invention, by arranging a plurality of impellers having axial flow blades coaxially in the housing, a large air flow without rotating the impeller at a high rotational speed and without enlarging the housing. To suppress the operation sound of the blower. When passing through the impeller located on the upstream side, the air flowing through the housing receives a centrifugal force and flows obliquely with respect to the shaft center, and is concentrated outside the impeller located on the downstream side. The diameter of the impeller located on the downstream side is made smaller than the diameter of the impeller located on the upstream side, and this impeller intensively accelerates the air flowing near the axis of the housing. Effectively increase the air flow without causing the vehicle to be wasted.
Further, in the present invention, the axial flow blades of the one impeller and the other impeller are twisted in opposite directions to suppress driving noise.

  In the blower according to the present invention, a gap between the outer periphery of the one impeller and the inner periphery of the housing is larger than a gap between the outer periphery of the other impeller and the inner periphery of the housing. .

  In the present invention, the clearance between the outer periphery of the impeller located on the downstream side and the inner periphery of the housing is increased, and centrifugal force is received from the impeller located on the upstream side, and the outer periphery of the impeller located on the downstream side is received. A sufficiently large passage for allowing the concentrated airflow to flow is secured, and wind noise generated in the gap between the outer periphery of each impeller and the inner periphery of the housing is suppressed.

  The blower according to the present invention includes a motor having an output shaft that is fixed in the housing and protrudes on both sides in the axial length direction of the housing, and the impellers are provided at both projecting end portions of the output shaft. It is characterized by being fixed.

  In the present invention, a motor having an output shaft projecting on both sides in the axial direction of the housing is used, and an impeller is fixed to each of both projecting ends of the output shaft, whereby the shaft of the blower including the motor is provided. Reduce the long dimension.

  The humidifier according to the present invention is a humidifier including a humidifying unit that humidifies air, the humidifier including the air blowing device, and the air humidified by the humidifying unit is sent out by the air blowing device. .

  In the present invention, by using a blower that can generate a large air volume, the amount of humid air that is humidified by the humidification unit and supplied to the room is increased to meet the demand for improved humidification performance.

A blower device according to the present invention is a blower device that generates airflow in a cylindrical housing and blows air in a direction along an axial center, and a plurality of impellers having axial flow blades are coaxially arranged in the housing. The gap between the outer periphery of one impeller and the inner periphery of the housing is located on the upstream side of the impeller, and other impellers adjacent to the impeller periphery and much larger than the gap between the inner periphery of the housing, wherein the axial flow vane of the one impeller and other impeller are respectively twisted in opposite directions.

In the present invention, regardless of the size of the impeller, the clearance between the outer periphery of the impeller located on the downstream side and the inner periphery of the housing is increased, and the centrifugal force is received from the impeller located on the upstream side, Secure a sufficiently large passage for airflow concentrated on the outer periphery of the impeller located on the side to suppress wind noise generated in the gap between the outer periphery of each impeller and the inner periphery of the housing To do.
Further, in the present invention, the axial flow blades of the one impeller and the other impeller are twisted in opposite directions to suppress driving noise.

  In the blower and the humidifier according to the present invention, the impeller can be lowered without increasing the size of the housing by arranging a plurality of impellers having axial flow blades in the axial direction in the housing. It is possible to obtain a large air volume as much as possible by rotating at the rotational speed, and to suppress the operation sound of the blower. Also, the diameter of the impeller located on the downstream side is made smaller than the diameter of the impeller located on the upstream side, and the air flowing near the shaft center of the housing is intensively accelerated by the impeller located on the downstream side. The air volume can be effectively increased without causing the impeller to perform a useless operation. Further, when viewed in a plan view, a plurality of impellers overlap in the housing, and the area occupied by the plurality of impellers in the housing is only one impeller, so the size of the blower can be reduced. .

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic side cross-sectional view showing the configuration of a humidifier equipped with a blower according to the present invention.
The illustrated humidifier includes a humidifying unit 1 that humidifies air and a blower unit 2 that is attached to the upper side of the humidifying unit 1 and sends out air. The humidification unit 1 includes a cylindrical casing 6 that is installed with the axis centered vertically. The interior of the housing 6 is divided into upper and lower parts by a partition wall 10 to form an upper air passage 5 and a lower tank chamber 11, and a water storage tank 3 is accommodated in the tank chamber 11.

  In the peripheral wall of the housing 6, an air inlet 18 is opened at a lower portion of the air passage 5. Inside the air passage 5, a humidifying filter 4 formed by folding a non-woven sheet material into a bellows shape is supported by a partition wall 10 that partitions the air passage 5 and the tank chamber 11, and the entire inner surface of the air inlet 18. It is arranged so as to face. The non-woven fabric constituting the humidifying filter 4 is a material that has high water content and allows ventilation.

  The partition wall 10 that supports the lower portion of the humidifying filter 4 is formed into a dish shape with its peripheral edge raised upward, and constitutes a drain pan that can store an appropriate amount of water. A circulating pipe 12 having an opening at the lowest position on the upper surface and extending into the lower storage chamber is connected to the partition wall 10, and a water supply pipe 13 is fixed so as to penetrate vertically. A lower portion of the water supply pipe 13 extending into the tank chamber 11 is bent so as to be parallel to the lower surface of the partition wall 10, and a water supply pump 14 is provided in the middle thereof. Further, the upper part of the water supply pipe 13 that extends into the air passage 5 is connected to a water supply pan 15 disposed above the humidifying filter 4.

  The water supply pan 15 is a dish that can store an appropriate amount of water, and is formed in a ring shape. A plurality of small-diameter water dropping holes 16, 16,..., 16 are provided on the bottom surface of the water supply pan 15 so as to open above the humidifying filter 4.

  The tank chamber 11 below the partition wall 10 has an opening on the entire surface of one side surface. The water storage tank 3 is a hollow water tank that stores water therein, and is detachable from the tank chamber 11 through the opening.

  In the water storage tank 3, a return pipe 31 and a water absorption pipe 32 are fixedly provided so as to penetrate a predetermined portion of the top plate 3a in the vertical direction. At the upper end of the return pipe 31 projecting an appropriate length above the top plate 3a, there is provided a water receiving port 33 that is expanded and opened in a funnel shape. When the water storage tank 3 is accommodated at a predetermined position inside the tank chamber 11, the water receiving port 33 communicates with the opening at the lower end of the reflux pipe 12 extending from the partition wall 10 into the tank chamber 11 as shown in FIG. 1. It ’s like that. Further, the lower end of the return pipe 31 extending below the top plate 3 a is opposed to the bottom plate 3 b of the water storage tank 3 with an appropriate distance.

  On the other hand, the upper portion of the water absorption pipe 32 protruding above the top plate 3 a is bent in parallel with the top plate 3 a toward the inner back of the tank chamber 11, and a connection portion 34 is formed at the upper end of the water absorption pipe 32. It is provided. When the water storage tank 3 is accommodated inside the tank chamber 11, the connecting portion 34 is fitted into the end of the water supply pipe 13 extending from the partition wall 10 to the inside of the tank chamber 11, as shown in FIG. The tube 13 is connected in a liquid-tight manner. Further, the lower end of the water absorption pipe 32 extending below the top plate 3 a is opposed to the bottom plate 3 b of the water storage tank 3 with an appropriate length, as with the return pipe 31.

  In addition, a water level sensor 35 is attached to the inside of the water storage tank 3 at a height position away from the bottom plate 3b by a predetermined length. The water level sensor 35 includes, for example, a float that swings up and down by buoyancy received from stored water inside the water storage tank 3, and is configured to be turned on when the water surface level of the stored water is equal to or lower than a predetermined level. The float switch is provided to notify the user that the stored water in the water storage tank 3 is insufficient during the operation described later.

  Next, the configuration of the blower unit 2 will be described in detail. 2 is a schematic side cross-sectional view of the blower unit 2, and FIG. 3 is a schematic plan cross-sectional view taken along line III-III in FIG.

  The blower unit 2 includes a bottomed cylindrical housing 21 attached to the upper end opening of the housing 6 with the bottom face up. An air supply port 26 is opened on the upper surface of the housing 21. A motor 22 is attached inside the housing 21. The motor 22 is supported by a plurality of support rods 23, 23,... 23 projecting inward from the inner periphery of the housing 21, and is coaxial with the housing 21.

  The motor 22 includes an output shaft 22 a that protrudes up and down on the axis of the housing 21. A first impeller 24 is fitted to the downward projecting end portion of the output shaft 22a, and the first impeller 24 includes a plurality of first axial flow blades 24a, 24a,. Yes. On the other hand, a second impeller 25 is fitted to an upward projecting end portion of the output shaft 22a, and the second impeller 25 includes a plurality of second axial flow blades 25a, 25a, ..., 25a. ing.

  As shown in FIG. 2, the diameter D1 of the first impeller 24 is larger than the diameter D2 of the second impeller 25, and the gap distance between the outer periphery of the second impeller 25 and the inner periphery of the housing 21. Y is larger than the gap distance X between the outer periphery of the first impeller 24 and the inner periphery of the housing 21.

FIG. 4 is an explanatory view for explaining the formation of the first axial flow blade 24a and the second axial flow blade 25a. In FIG. 4, the peripheral surfaces of the first impeller 24 and the second impeller 25 are shown expanded.
As shown in FIG. 4, the first axial flow vane 24a has an arcuate cross section inclined with respect to the axial center of the housing 21, and the second axial flow vane 25a is inclined in the same direction as the first axial flow vane 24a. Having an arcuate cross section. The first axial flow blade 24a has a warp with the downstream side convex, and the second axial flow blade 25a has a warp with the upstream side convex. In other words, the first axial flow blade 24a and the second axial flow blade 25a are twisted in opposite directions.

  As shown in FIG. 1, the humidifier configured as described above is used by setting a water storage tank 3 for storing an appropriate amount of water inside a tank chamber 11. At this time, as described above, the return pipe 31 of the water storage tank 3 is communicated with the reflux pipe 12 via the water receiving port 33 at the upper end, and the water absorption pipe 32 is liquid-tightly connected to the water supply pipe 13 via the upper connection portion 34. Connected to.

  When an operation switch (not shown) is turned on in this state, the water supply pump 14 is driven, the motor 22 is driven, the output shaft 22a rotates, and as shown by the arrows in FIG. The second impeller 25 rotates in one direction. Due to the rotation of the first impeller 24 and the second impeller 25, outside air is introduced into the air passage 5 through the intake port 18 as shown by broken arrows in FIG. The humidification filter 4 is ventilated to escape inside. The outside air that has escaped inward changes its direction upward, flows through the central opening of the ring-shaped water supply pan 15, and is sent into the blower unit 2. And the external air sent in the ventilation unit 2 is sent out indoors from the air supply opening 26 through the 1st impeller 24 and the 2nd impeller 25. FIG.

  On the other hand, when the water supply pump 14 is driven, the water stored in the water storage tank 3 is sucked into the water intake pipe 13 provided with the water supply pump 14 and is sent to the water supply pan 15 through the water supply pipe 13. The water sent to the water supply pan 15 stays over the entire circumference of the ring-shaped water supply pan 15, and then passes through the water dropping holes 16, 16,... To flow down. The nonwoven fabric sheet which comprises the humidification filter 4 has high water content, and the water which flows down from the water dropping hole 16,16, ..., 16 is impregnated and hold | maintained by the humidification filter 4. FIG.

  Since the air introduced from the intake port 18 flows through the humidifying filter 4 as described above, the water contained in the humidifying filter 4 is vaporized and mixed during the ventilation. Then, the direction is changed as described above, and the air sent out from the air supply port 26 into the room becomes humid air, and the room can be humidified.

  Next, the air flow path in the blower unit 2 will be described in detail. FIG. 5 is a schematic enlarged side sectional view of the blower unit 2. In FIG. 5, a line indicated by a broken line represents an air flow, and an air flow passing through the outer periphery of the first impeller 24 is F <b> 1 and an air flow passing through the shaft portion of the first impeller 24 is F <b> 2.

  As indicated by F <b> 1 in the figure, the air passing through the outer periphery of the first impeller 24 receives axial pressure from the first impeller 24 and centrifugal force when passing through the first impeller 24. In response to this, it flows obliquely with respect to the axial direction and concentrates outside the second impeller 25. The air concentrated outside the second impeller 25 flows through a gap between the outer periphery of the second impeller 25 and the inner periphery of the housing 21.

  On the other hand, as indicated by F2 in the figure, the air that has passed through the vicinity of the axial center of the first impeller 24 is accelerated by receiving axial pressure when passing through the second impeller 25, and the housing. It rises along the inner circumference of 21.

  In the blower unit 2 according to the embodiment, the first impeller 24 and the second impeller 25 are arranged in series in the housing 21 along the axial direction. The 1 impeller 24 and the 2nd impeller 25 overlap, and it is not necessary to make the diameter of the housing 21 large. In addition, since a large amount of air is obtained by the first impeller 24 and the second impeller 25, the rotation speed of the first impeller 24 and the second impeller 25 can be reduced, and the operation sound of the blower unit 2 is suppressed. be able to. Further, by making the diameter of the second impeller 25 smaller than the diameter of the first impeller 24, the air that has passed near the axial center of the first impeller 24 is intensively accelerated by the second impeller 25, The air volume can be increased without causing the second impeller 25 to perform a useless operation.

  In the blower unit 2 according to the embodiment, the gap distance Y between the outer periphery of the second impeller 25 and the inner periphery of the housing 21 is the gap between the outer periphery of the first impeller 24 and the inner periphery of the housing 21. The distance X is larger than the distance X, and a large-area passage for air to flow between the outer periphery of the second impeller 25 and the inner periphery of the housing 21 is secured. For this reason, wind noise generated when air concentrated on the outer periphery of the second impeller 25 passes between the outer periphery of the second impeller 25 and the inner periphery of the housing 21 can be suppressed.

In the air blowing unit 2 according to the embodiment, the direction of warping of the first axial flow blade 24a and the direction of warping of the second axial flow blade 25a are reversed. This reason is for suppressing the driving | running sound of the humidifier provided with the ventilation unit 2. FIG.
According to the demonstration experiment, the operation sound of the humidifier equipped with the blower unit 2 measured when the directions of warping of the first axial flow blade 24a and the second axial flow blade 25a are the same is approximately 54 [dB]. Met. On the other hand, the operation sound of the humidifier equipped with the blower unit 2 is measured by reversing the directions of warping of the first axial flow blade 24a and the second axial flow blade 25a and making the other conditions the same as those in the measurement. , Approximately 49 [dB]. That is, by reversing the directions of warping of the first axial flow blade 24a and the second axial flow blade 25a, the operating sound of the humidifier provided with the blower unit 2 is reduced by approximately 5 [dB], and the humidifier is made quieter. Can be achieved.
The other conditions are as follows: the diameter of the housing 21: 170 [mm], the diameter D1: 164 [mm] of the first impeller 24, the diameter D2: 146 [mm] of the second impeller 25, and the first impeller 24. The gap distance X between the outer periphery of the housing 21 and the inner periphery of the housing 21 is 3 [mm], the gap distance Y between the outer periphery of the second impeller 25 and the inner periphery of the housing 21 is 12 [mm], the first impeller 24 and the first impeller 24. The rotational speed of the two impellers 25 is approximately 1600 [rpm].

  Moreover, in the air blower unit 2 which concerns on embodiment, the 1st impeller 24 and the 2nd impeller 25 are each fitted by the protrusion end part which protruded below and upward of the output shaft 22a. As a result, the axial length of the blower unit 2 including the motor 22 can be shortened, and the blower unit 2 can be downsized.

  In the humidifier according to the embodiment, the humidifying unit 1 is provided with the blower unit 2 that can generate a large air volume, thereby increasing the amount of humid air humidified by the humidifying unit 1 to the room. Therefore, the humidifying performance of the humidifier can be improved.

In addition, although the blower unit 2 which concerns on embodiment has two impellers, the blower unit 2 may be provided with three or more impellers. Moreover, in the humidifier which concerns on embodiment, although the ventilation unit 2 is attached to the humidification unit 1, you may make the humidification unit 1 and the ventilation unit 2 integral.
In the blower unit 2 according to the embodiment, the diameter of the first impeller 24 is larger than that of the second impeller 25. However, the diameters of the first impeller 24 and the second impeller 25 are substantially the same, and the housing 21 The diameter of the upstream portion of the housing 21 is decreased, the diameter of the downstream portion of the housing 21 is increased, and the gap distance between the outer periphery of the first impeller 24 and the inner periphery of the housing 21 is determined. It may be smaller than the gap distance from the inner circumference. For example, it is conceivable that the upstream portion of the housing 21 is a large-diameter cylinder, the downstream portion of the housing 21 is a small-diameter cylinder, and both cylinders are connected. It is also conceivable to make the housing 21 a cylinder whose diameter increases toward the upstream.

It is typical side surface sectional drawing which shows the structure of a humidifier provided with the air blower which concerns on this invention. It is a simplified side sectional view of a blower. FIG. 3 is a schematic plan sectional view taken along line III-III in FIG. 2. It is explanatory drawing explaining the formation aspect of a 1st axial flow blade | wing and a 2nd axial flow blade | wing. It is a simplified expanded side sectional view of the blower.

Explanation of symbols

1 Humidification unit 2 Blower unit (blower)
DESCRIPTION OF SYMBOLS 3 Water storage tank 14 Water supply pump 18 Intake port 21 Housing 22 Motor 22a Output shaft 24 1st impeller 25 2nd impeller 24a 1st axial flow blade 25a 2nd axial flow blade 26 Air supply port

Claims (5)

In a blower that generates airflow in a cylindrical housing and blows air in a direction along the axis,
A plurality of impellers having axial flow blades are arranged coaxially in the housing,
The diameter of one impeller is positioned on the upstream side of the impeller, rather smaller than the diameter of the phase Tonariru other impeller to the impeller,
The blower characterized in that the axial flow blades of the one impeller and the other impeller are twisted in opposite directions . The air blower according to claim 1, wherein a gap between an outer periphery of the one impeller and an inner periphery of the housing is larger than a gap between the outer periphery of the other impeller and the inner periphery of the housing. . A motor having an output shaft that is fixed in the housing and protrudes on both sides in the axial direction of the housing;
The blower according to claim 1 or 2 , wherein the impeller is fixed to both projecting ends of the output shaft. In a humidifier equipped with a humidifying unit that humidifies air,
The air blower according to any one of claims 1 to 3 ,
A humidifier, wherein the air humidified by the humidifying unit is sent out by the blower. In a blower that generates airflow in a cylindrical housing and blows air in a direction along the axis,
A plurality of impellers having axial flow blades are arranged coaxially in the housing,
A gap between the outer periphery of one impeller and the inner periphery of the housing is located upstream of the impeller, and the outer periphery of another impeller adjacent to the impeller and the inner periphery of the housing much larger than the gap,
The blower characterized in that the axial flow blades of the one impeller and the other impeller are twisted in opposite directions .

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