JP2010084701A - Blowing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a stable swirl flow near an air suction port, improve an air amount-pressure characteristic, reduce noise, and reduce shaft power in a blowing device provided with an air suction flow passage that guides air along the air suction port side on a centrifugal fan impeller side from one direction to the air suction port. <P>SOLUTION: This blowing device including a centrifugal fan, an air blowout passage provided to the outer periphery of the centrifugal fan impeller, and an air suction flow passage provided in a form to surround the air suction port of the centrifugal fan impeller and opened in the direction orthogonal to the axis of the centrifugal fan impeller, is configured so that the air suction port of the centrifugal fan impeller is projected into the air suction flow passage. By such a configuration, the air suction port of the centrifugal fan impeller becomes an annular part having a circular cross section, a contraction action is obtained by the annular part, and by a rectifying effect thereby, a stable suction swirl flow is formed at a portion of the air suction port. As a result, the air amount-pressure characteristic is improved, and reduction of noise and reduction of shaft power are obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blower device provided with a centrifugal fan, and more particularly, to a blower device provided with an air suction channel for guiding air from one direction to the air suction port along the air suction port side of the centrifugal fan impeller. Is.

  If it is difficult to suck in the air directly from the air intake port of the centrifugal fan impeller due to installation reasons, etc., air intake from one direction perpendicular to the axis along the air intake port of the centrifugal fan impeller An air blower provided with a sleeve-shaped air suction flow path (guide flow path) for guiding suction air to the mouth portion is used (see, for example, Patent Document 1).

JP 2006-299953 A

  However, in the case of providing such an air suction channel, the air suction direction of the air suction port and the air inflow direction to the air suction channel are in a state orthogonal to the circular fan air suction port. A smooth suction swirl flow is difficult to form, and an unstable flow tends to occur. As a result, there is a problem that the air flow-static pressure characteristics become unstable and the driving sound becomes loud.

  The present invention has been made to solve such a problem, and the air suction port of the centrifugal fan impeller is configured to protrude into the air suction flow path, thereby realizing a contraction action. An object of the present invention is to provide a blower device that improves air volume-pressure characteristics by forming a stable swirling flow in the vicinity of the air suction port, and achieves noise reduction and reduction of shaft power.

  In order to solve the above-described problems, the present invention is configured with the following effective problem solving means.

(1) The problem solving means of the invention of claim 1 The problem solving means of the present invention includes a centrifugal fan, an air outlet passage provided on an outer periphery of the impeller of the centrifugal fan, and an air suction port of the centrifugal fan impeller. An air suction passage provided in a surrounding shape and opened in an axis orthogonal direction of the centrifugal fan impeller, wherein the air suction port of the centrifugal fan impeller includes the air suction flow It is characterized by a configuration that protrudes into the road.

  According to such a configuration, the air suction port of the centrifugal fan impeller becomes an arc-shaped annular portion protruding into the air suction passage, and the contraction action of the air flowing into the air guide passage is realized by the annular portion. A stable suction swirl flow is formed in the circular air suction port portion by the rectifying effect thereby.

  As a result, air volume-pressure characteristics are improved, and noise reduction and shaft power reduction are realized.

(2) The problem solving means of the invention of claim 2 The problem solving means of the invention is the structure of the problem solving means of the invention of claim 1, wherein the air blowing passage is an air blowing passage in a diagonal flow centrifugal direction. It is characterized by that.

  In such a configuration, the air suction port of the centrifugal fan impeller can be more easily protruded toward the air suction flow path, and the blown airflow can be easily converted into a mixed flow centrifugal flow.

(3) The problem-solving means of the invention of claim 3 The problem-solving means of the present invention is the configuration of the problem-solving means of the invention of claim 1 or 2, wherein the air suction channel is the air protruding from the centrifugal fan impeller. It is characterized in that it surrounds the outer periphery of the suction port and is partitioned through an air blowing passage and its passage wall.

  According to such a configuration, since the wall surface of the air blowing passage in the centrifugal direction or the mixed flow centrifugal direction described above can be used effectively, the axial dimension of the sleeve-shaped air suction channel is substantially larger. can do. For this reason, the suction swirl flow is relaxed and stabilized, and adverse effects due to the reverse pre-swirling inflow are reduced, and better performance can be obtained.

  Further, if the air suction port is formed into a substantially oval-shaped annular portion (the outer peripheral end surface is rounded or not rounded, etc.) as necessary, a better contraction and rectification effect can be achieved, so that it is even better. Performance can be obtained.

(4) Problem solving means of the invention of claim 4 The problem solving means of the invention is the structure of the problem solving means of the invention of claim 1, 2, or 3, wherein the centrifugal fan impeller of the air suction passage passage wall is provided. The portion facing the air suction port is provided with a substantially conical rectifying member protruding in the direction of the air suction port.

  According to such a configuration, a smoother and more stable suction swirl flow can be formed by adding a rectifying member having a substantially conical shape (including a truncated cone shape, a single leaf hyperboloid shape, etc.), and a further air flow rate. -Improve pressure characteristics, reduce noise and reduce shaft power.

(5) Problem solving means of the invention of claim 5 The problem solving means of the invention is the structure of the problem solving means of the invention of claim 1, 2, 3 or 4, wherein the impeller of the centrifugal fan has no shroud. It is a multi-blade impeller.

  According to such a configuration, in the case of a shroudless centrifugal fan, the suction port inner diameter can be made larger than that of a centrifugal fan with a shroud. Is remarkable.

(6) The problem-solving means of the invention of claim 6 The problem-solving means of the present invention is combined with a desired air conditioning means in the configuration of the problem-solving means of the invention of claim 1, 2, 3, 4 or 5, It is characterized by being configured as a blowing means for an air conditioner.

  According to such a configuration, an air conditioner or an air in a mixed flow centrifugal blowout passage (all-direction blow, four-direction blow, three-direction blow, two-way blow) with high air volume-pressure characteristics, quietness, and low axial power. A high-performance dehumidifying device or the like in which a moisture adsorption element is disposed in front of the suction channel can be appropriately realized.

  As a result of the above, according to the present invention, good fan performance is realized by effectively using the outer peripheral surface of the air blowing passage. (Energy saving) is achieved, and the axial dimensions are reduced by these effects.

  Several preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

(Best Embodiment 1)
First, FIGS. 1-5 has shown the structure of the air blower which concerns on the best Embodiment 1 of this invention.

  The blower 1 includes a rectangular main body casing 11, a centrifugal fan 2 provided in the main body casing 11, and an air blowout in a mixed flow centrifugal direction provided in three directions on the outer periphery of the impeller 21 of the centrifugal fan 2. A rectangular cross-sectional shape provided in such a manner as to surround the passages 3, 3, 3 and the annular air suction port 4 of the centrifugal fan impeller 21 from the lower side and opened to one side in the direction perpendicular to the axis of the centrifugal fan impeller 21. And the air suction port 4 of the centrifugal fan impeller 21 is configured to protrude into the air suction channel 5 by a predetermined dimension S, and the air suction channel 5 Encloses the outer periphery of the projecting annular air suction port 4 of the centrifugal fan impeller 21 and is partitioned through air blow passages 3, 3 and 3 in the oblique flow centrifugal direction and a lower passage wall 11c. It is characterized by being.

  The main body casing 11 includes a top plate portion 11a for suspending and supporting the impeller 21 of the centrifugal fan 2, a side wall portion 11b extending downward from the outer periphery of the top plate portion 11a, and a passage wall extending inward from the outer wall portion 11b. 11c, and a bottom plate portion 11d that is below the passage wall 11c and covers the blades 21b, 21b,... Of the impeller 21 of the centrifugal fan 2. Air blowing passages 3, 3, and 3 having a predetermined length extending in the oblique flow centrifugal direction are formed in the three-way portion of the portion 11b by the outer periphery of the top plate portion 11a, the passage wall 11c, and the bottom plate 13d. Further, the bottom plate portion 11d is opened in a reverse funnel shape corresponding to the inner diameter of the blades 21b, 21b... Of the centrifugal impeller 21 of the centrifugal fan 2, and the bottom plate forming the same opening portion. The portion 11c forms a flat surface extending in the horizontal direction with a predetermined width after being bent in an arc shape radially inward while extending downward by the predetermined dimension S from the inner end portion of the passage wall 11c. An air suction port 4 having a bell mouth structure is formed inside.

  The air suction flow path 5 has a rectangular structure (cross section U shape) with respect to the lower portion of the side wall portion 11b of the main body casing 11, and the air suction flow path forming plate 12 is predetermined between the passage wall 11c and the bottom plate 11d. It is formed by attaching them integrally while maintaining the passage heights H and L.

  In the case of this embodiment, the air intake opening 5a of the air suction passage 5 is provided on the side of the side wall portion 11b where the air blowing passages 3, 3 and 3 are not provided.

  The centrifugal impeller 21 of the centrifugal fan 2 includes a circular main plate 21a having a predetermined diameter, and a plurality of blades 21b, 21b,... Arranged in the circumferential direction at predetermined intervals on the outer peripheral side surface of the main plate 21a. And a ring member 21c for forming a circulating flow that is fitted and integrated with the outer peripheral surface of the other end in the span direction of the plurality of blades 21b, 21b,... The side boss portion 21 d is fixedly integrated with the drive shaft 6 a of the fan motor 6, and is supported by being suspended at the center of the top plate portion 11 a of the main body casing 11 via the fan motor 6.

  The main plate 21a is suspended so as to be loosely fitted in a main plate fitting recess 7 having a predetermined depth formed in the main body casing top plate portion 11a.

  The air outlet passages 3, 3 and 3 extending in the mixed flow centrifugal direction from the air outlet portion of the impeller 21 respectively open the downstream outlet portion in the three side walls 11b, 11b and 11b as described above. However, the height of the upper wall surface 3a of the passage is equal to the height of the lower surface of the blade mounting portion on the outer peripheral side of the main plate 21a of the impeller 21 by using the fitting dimension to the main plate fitting recess 7. On the other hand, the height of the lower wall surface 3b of the passage is formed to be equal to the height of the upper surface of the rear end portion b of the blade other end portion side ring member 21c of the impeller 21.

  In the case of Embodiment 1, an air circulation space 8 having a predetermined width is formed on the upper surface side of the bottom plate 11d (the portion corresponding to the ring member 21c of the air passage in the main body casing 11). The circulation flow F of air sucked from the air outlet side of the centrifugal impeller 21 through the back side of the air suction port 4 to the air suction side of the centrifugal impeller 21 can be easily and reliably formed. It is like that.

  In the air blower having such a configuration, when the fan motor 6 is driven and the impeller 21 of the centrifugal fan 2 rotates as indicated by the arrow in FIG. 2, the air suction flow from the air intake port 5 a of the air suction flow path 5. Air is sucked into the passage 5 as shown by the arrows in FIGS. 1 and 2, and the air in the air suction flow path 5 passes from the air inlet 4 of the bell mouth structure to the blades 21 b and 21 b of the centrifugal impeller 21. ... Are sucked in between, but the air suction direction of the air suction port 4 and the air inflow direction to the air suction passage are perpendicular to the circular fan air suction port 4 from one direction. In addition, it is difficult to form a smooth suction swirl flow, and an unstable flow tends to occur. As a result, there is a problem that the air volume-static pressure characteristic becomes unstable and the driving sound becomes loud.

  Therefore, in this embodiment, the air suction port 4 on the centrifugal fan impeller 21 side protrudes by a predetermined dimension S into the air suction flow path 5 and both the outer peripheral surface side and the inner peripheral surface side are arc-shaped. It is configured as an elliptical annular member.

  Therefore, the air suction port 4 which is the same annular member realizes a contraction action around the air suction port 4, and a rectifying effect thereby forms a stable suction swirl flow in the air suction port 4, and the suction state is It will be smooth.

  As a result, air volume-pressure characteristics are improved, and noise reduction and shaft power reduction are realized.

  The air suction flow path 5 in the same configuration surrounds the outer periphery of the annular air suction port 4 of the centrifugal fan impeller 21, and the air flow passages 3, 3, 3 in the diagonal flow centrifugal direction and It is partitioned through a passage wall 11c.

  Therefore, the axial dimension H of the sleeve-shaped air suction passage 5 can be increased while effectively using the passage wall 11c surface of the blowout passages 3, 3, and 3 in the direction of centrifugal mixed flow (H = L + S). For this reason, the suction swirl flow is relaxed and stabilized, and adverse effects due to the reverse pre-swirling inflow are reduced, and better performance can be obtained.

  In addition, in the case where the outer peripheral surface portion of the annular bottom plate 11d forming the air suction port 4 is rounded as described above, a better current flow rectifying effect is achieved, so that even better performance can be obtained. it can. Of course, substantially the same operation can be obtained without roundness.

  Then, the air flow smoothly sucked into the impeller 21 as described above flows in the mixed flow centrifugal direction from the outer periphery of the blades 21b, 21b... Of the centrifugal impeller 21 through the air blowing passages 3, 3, 3. At this time, the blades 21b, 21b,... Are in the diagonal flow direction approaching the main plate 21a side as the position of the opposite main plate side end portion moves from the air suction side to the air blowing side. Further, instead of the shroud, a ring member 21c extending in the same inclination direction (diagonal flow direction) is provided at the end on the opposite main plate side. Moreover, the ring member 21c is bent such that the front end a side slightly extends into the air circulation space 8 on the bottom plate 11d side. Therefore, the operation of generating the illustrated circulating flow F by the ring member 21c is facilitated, while the main flow in the diagonal flow centrifugal direction is also smoothed.

  Further, in the case of the centrifugal fan impeller having such a shroud structure, the inner diameter of the air suction port 4 can be made larger than that in the case of the centrifugal fan impeller with shroud. The adverse effect due to is effectively mitigated and the noise reduction becomes more prominent.

(results of the experiment)
Now, for example, as shown in FIG. 4, predetermined design conditions (inner diameter φD ₀ of the blade 21 b portion of the impeller 21, the axial dimension L of the air suction channel 5 of the air suction port 4, and the protruding dimension of the air suction port 4 S), etc. (see the following description), a blower having the same configuration as that of FIGS. 1 to 3 was made as a prototype, and outwardly in the horizontal direction from the air intake 5a which is an open portion to the outside. A microphone M for collecting sound was installed at a distance of 1 m, and the operating noise in the predetermined air volume range was measured.

The measurement result (noise level) is shown in FIG. 5 (note that the predetermined design conditions are set such that L = 28 mm and 34 mm, S = ₀ mm and 6 mm, φD ₀ = 130 mm, the air volume is 2.4 m ³ / min, It was operated at a static pressure of 3.6 mmAq).

  From this result, as described above, the outer circumferential surface of the passage wall 11c of the mixed-flow centrifugal blow-out passage 3 is utilized to make the circular air suction port 4 into an annular member structure having an oblong cross section, and the air suction flow path 5 by the dimension S. When projecting inward, it can be seen that the fan performance is effectively improved by the relaxation of the reverse pre-swirl flow and the rectification effect by the contracted flow.

  That is, according to the experimental results, the noise level was reduced by 0.5 dBA even if the actual axial dimension L was made 6 mm compact.

(Best Mode 2)
Next, FIG. 6 shows the configuration of the blower according to the second preferred embodiment of the present invention.

  In the air blower 1, the configuration of the annular air suction port 4 protruding downward on the centrifugal fan 2 side in the configuration of the best embodiment 1 described above, the bottom plate portion 11d of the main body casing 11 as a flat portion as described above. Is not realized by bending into an elliptical cross section including the opening edge portion 9 of the flat bottom plate portion 11c extending horizontally in the center direction along the lower surface of the passage wall 11c. By attaching the annular member 10a having a semi-elliptical cross section having no rounded surface, the air suction port 4 of the centrifugal fan impeller 21 has an annular member structure protruding into the air suction passage 5 by a predetermined dimension S. Similarly, a stable swirling flow is formed in the vicinity of the air suction port 4 to improve the air volume-pressure characteristics and to reduce noise and reduce shaft power.

  Even if it does in this way, the completely same effect can be acquired.

(Modification)
In this case, if the same annular member 10a is further rounded on the outer peripheral surface portion 10b as shown in FIG. 7, for example, a better contraction and rectification effect can be achieved. Obtainable.

(Best Mode 3)
Next, FIG. 8 shows the configuration of the blower according to the third preferred embodiment of the present invention.

  In this air blower 1, in the configuration of the best embodiment 1 described above, a frustoconical shape is formed at a portion facing the air suction port 4 on the centrifugal fan impeller 21 side on the lower surface side passage wall 12 a of the air suction channel 5. The flow straightening member 15 is provided.

  According to such a configuration, the air that has entered the vicinity of the air suction port 4 from the opening 5a side of the air suction channel 5 is reduced in the swirling direction on the lower side by the truncated cone-shaped rectifying member 15. Since the air flow is guided in the direction of the air inlet 4, a smoother and more stable swirling flow is formed in the air inlet 4, further improving the air volume-pressure characteristics, reducing noise, and shaft power Can be reduced.

  The flow regulating member 15 may have a conical shape or a single leaf hyperboloid shape.

(Fourth Embodiment)
Next, FIG. 9 shows a configuration of a blower according to the fourth embodiment of the present invention.

  In this blower 1, air conditioning for dehumidification is provided by installing a moisture adsorbing element (hygroscopic material) 16 at the uppermost stream side air intake 5a portion of the air suction passage 5 in the configuration of the best embodiment 1 described above. The apparatus is characterized by being configured as an apparatus.

  Thus, this invention can implement | achieve these each air conditioning apparatus in the form with the completely same effect by combining with various air conditioning means, such as a heat exchanger and a dehumidification member.

(Other embodiments)
In the above embodiment, the description has been given of the example in which the three-way blowing mode is adopted. However, the configuration of the present invention is applicable to any one of the blowing modes, such as all-round blowing, four-way blowing, and two-way blowing. However, the same can be applied.

  The same configuration can be applied to a mixed flow fan of a centrifugal fan.

It is sectional drawing which shows the structure of the air blower which concerns on best Embodiment 1 of this invention. It is a partially notched bottom view (AA of FIG. 3) of the air blower. It is a center sectional view (BB of Drawing 2) of the blower. It is sectional drawing which shows the structure similar to FIG. 1 under the predetermined design conditions of the same air blower. It is a graph which shows measurement data, such as an air volume-pressure characteristic of the air blower in the structure of the same FIG. It is sectional drawing which shows the structure of the air blower which concerns on best Embodiment 2 of this invention. It is sectional drawing of the modification of the air blower of FIG. It is sectional drawing which shows the structure of the air blower which concerns on best Embodiment 3 of this invention. It is sectional drawing which shows the structure of the air blower which concerns on best Embodiment 4 of this invention.

Explanation of symbols

  1 is a blower, 2 is a centrifugal fan, 3 is an air outlet passage, 4 is an air suction port, 5 is an air suction channel, 5a is an air intake opening, 6 is a fan motor, and 9 is an air suction port 4 opening. Edge portions 10a and 10b are annular members, 11 is a main body casing, 11a is a top plate portion, 11b is a side wall portion, 11c is a passage wall, 11d is a bottom plate portion, 15 is a rectifying member, 16 is a moisture adsorption element, and 21 is a blade. A car, 21a is a main plate, 21b is a blade, and 21c is a ring member.

Claims (6)

  A centrifugal fan, an air outlet passage provided on the outer periphery of the impeller of the centrifugal fan, and an air suction port of the centrifugal fan impeller are provided so as to surround, and opened in a direction orthogonal to the axis of the centrifugal fan impeller. An air blower comprising an air suction passage, wherein the air suction port of the centrifugal fan impeller protrudes into the air suction passage.   The air blower according to claim 1, wherein the air blowing passage is an air blowing passage in a mixed flow centrifugal direction.   3. The air blower according to claim 1, wherein the air suction passage surrounds the outer periphery of the air suction port from which the centrifugal fan impeller protrudes, and is partitioned through an air blowing passage and a passage wall thereof. apparatus.   A substantially conical rectifying member protruding in the direction of the air suction port is provided at a portion of the air suction channel passage wall facing the air suction port of the centrifugal fan impeller. The blower according to 2 or 3.   The blower according to claim 1, 2, 3, or 4, wherein the impeller of the centrifugal fan is a multiblade impeller without a shroud.   The blower according to claim 1, 2, 3, 4 or 5, wherein the blower is configured as a blower for an air conditioner in combination with a desired air conditioner.

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