JP4510172B2 - Cross flow fan - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a cross flow fan (cross-flow fan) that constitutes a blower together with a drive motor, an indoor unit of an air conditioner, an air purifier, a humidifier, a dehumidifier, a fan heater, a cooling device, and a ventilation device using the fan. The present invention relates to a fluid feeder.
[0002]
[Prior art]
In recent years, energy saving is desired from the viewpoint of global environmental problems and energy problems. In such a situation, in the fluid feeding device such as an air conditioner indoor unit, an air purifier, a humidifier, a dehumidifier, a fan heater, a cooling device, and a ventilator, in order to realize energy saving, the noise is low and There is a strong demand for a blower system with good airflow characteristics.
[0003]
The configuration of a conventional general crossflow fan is shown in FIG. In FIG. 12, the crossflow fan 21 includes a crossflow type impeller 22, a rear guider 23 that covers a circumferential side surface in one direction across the impeller 22, and a stabilizer 24 that is disposed close to the other circumferential side surface. It is comprised and the casing 26 which has the blowing outlet part 25 and the suction inlet part is provided.
[0004]
In such a configuration, a circulating vortex is generated in the vicinity of the stabilizer 24 by the rotation of the impeller 22, and a flow as shown in FIG. 13 is generated. Noise is generated during the air blowing operation. The noise can be roughly divided into three types: an electromagnetic sound for driving the motor, an NZ sound related to the number of blades and the number of rotations, and a sound of wind. FIG. 14 shows the wind flow when attention is paid only to the suction side rear guider end.
[0005]
In FIG. 14, when the flow 27 near the suction side rear guider 23 flows into the end of the rear guider, an opposite vortex region S2 is generated on the side opposite to the guide surface of the rear guider 23 and further flows into the fan side from the end. In this case, it peels off at the end portion, forms the impeller side vortex region S1, and again approaches the rear guider 23 side due to the influence of the impeller 22, and then flows along the rear guider 23.
[0006]
In the invention described in Japanese Patent Laid-Open No. 5-302729 aiming at increasing the air volume and improving the efficiency of the blower system by changing the shape of the rear guider, a blower system as shown in FIG. 15 is proposed. In FIG. 15, 40 is an air conditioner body, 41 is a heat exchanger that exchanges heat between room air and refrigerant, 42 is a crossflow fan for blowing air, and 43 is behind the crossflow fan. A fixed rear guider 44, a stabilizer positioned on the front side of the cross flow fan 42, 45 an air outlet into the air conditioner main body 41, 46 a wind direction adjusting louver provided in the air outlet 45, and 48 a rear guide tongue It is a guider installed above. By providing the guider 48, a vortex is generated between the rear guider 43 and the guider 48, and the air flow characteristic is improved by utilizing the attractive force.
[0007]
[Problems to be solved by the invention]
However, in the case of improving the air flow characteristics by the configuration of the guider 48, it is conceivable that a molding problem may occur when the guider 48 is provided in the cabinet portion.
[0008]
That is, in FIG. 15, the heat exchanger 41 is configured to be adjacent to the front cover. However, in a model intended to save energy, a heat exchanger is usually installed also in the direction of the rear guider 43. Therefore, the rear guider 43 or guider 48 needs to function as a drain pan. If the drain pan is installed and the guider 48 is provided, the shape becomes complicated. Therefore, a very complicated mold is required, resulting in an increase in production cost, which is not very practical.
[0009]
In view of such a situation, the present invention aims to realize a configuration in which the noise of the cross-flow fan is reduced, the air flow characteristics are good, and the molding is easy.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a cross-flow type impeller, a rear guider that covers a circumferential side surface in one direction across the impeller, and a stabilizer that is disposed close to the other circumferential side surface, In the cross flow fan including a casing having a blow-off port portion, the suction side end portion of the rear guider has a protrusion shape having a thickness gradually changing in the thickness direction of the rear guider member, and the protrusion cross-sectional shape is an arc shape or end rectifying protrusion having a curved curved portion is provided, wherein the rectifying protrusion is the impeller side and which either a protruding shape on the opposite side to the guide surface of the rear guider, and the The guide surface or back surface of the rear guider opposite to the rectifying protrusion is linear, and the edge side of the rear guider that is continuous with the rectifying protrusion and the linear guide surface or back surface. Bets are those corners intersecting has adopted a configuration which is the R configuration.
[0011]
Adopting the shape of the straightening protrusion at the suction side end of the rear guider, and the guide surface or back surface of the rear guider opposite to the straightening protrusion is straight, and the straight edge of the rear guider that is continuous with the straightening protrusion and the straight line Since the corner portion intersecting with the guide surface or the back surface has an R shape, compared to the suction side end shape of the rear guider with an angle R as in the conventional example shown in FIG. The swirl area of the air flow can be kept to a minimum, the noise can be reduced, and the swirl area can be reduced, reducing pressure loss on the fan itself and improving fan efficiency. It is possible to increase the air flow characteristics.
[0012]
Rectifying protrusion, it has a thickness which gradually changes in the thickness direction of the rear guider member, and in which the shape of the projection section has an arcuate or curved curved portion, the impeller-side and the guide surface of the rear guider Any shape may be used as long as it protrudes to the opposite side. For example, the shape which the rectification protrusion protruded only in the impeller side with respect to the guide surface of a rear guider, and the shape which protruded only in the reverse direction with respect to the impeller with respect to the guide surface of a rear guider are mention | raise | lifted .
[0013]
Further, the rectifying protrusion may be formed integrally with the rear guider member or separately. In the case of integrally forming the rectifying protrusion, in the conventional rear guider mold, the rectifying protrusion can be easily formed only by modifying a part of the mold by cutting or the like. If the rectifying protrusion is made of a member separate from the rear guider, if you need to make subsequent changes, such as finding a shape that can reduce noise and have good airflow characteristics, you can change only the rectifying protrusion. It can be an effective means in terms of sufficient.
[0014]
As a material of the rectifying protrusion, when integrally molded with the rear guider, either a metal or a synthetic resin can be adopted according to the material of the rear guider. For example, when the rear guider is a metal plate, the suction side end can be bent in an arc shape to form the rectifying protrusion. Further, when the rectifying protrusion is formed of a member separate from the rear guider, any metal or synthetic resin can be employed regardless of the material of the rear guider.
[0015]
The cross flow fan as described above constitutes a blower together with a drive motor. The blower is a fluid feed device such as an indoor unit of an air conditioner, an air purifier, a humidifier, a dehumidifier, a fan heater, a cooling device, or a ventilation device. If this is used, the noise of these fluid feeders can be reduced, and the air flow characteristics can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view of a cross flow fan showing a reference example of the present invention .
In FIG. 1, a cross flow fan 1 is a fan through which a fluid passes through a multi-blade impeller in a cross section perpendicular to the axis, and is connected to a motor or the like and rotates. The rear guider 3 covers a circumferential side surface (rear side) in one direction with the impeller 2 interposed therebetween, and a stabilizer 4 having a cross-section shaped cross section disposed in proximity to the other circumferential side surface (front side). And a casing 6 having the same.
[0017]
The rear guider 3 is formed of a synthetic resin, and a rectifying protrusion 7 having a thickness gradually changing in the thickness direction of the rear guider member is integrally formed at an end portion on the suction side. As shown in FIG. 3, the rectifying protrusion 7 has arcuate or curved curved portions 7b, 7c that project on both sides in the direction perpendicular to the guide surface 3a of the rear guider 3 as shown in FIG. The curved portion 7b, 7c has an edge-side curved portion 7d that is continuous, and has a complex curved shape that is smoothly continuous as a whole.
[0018]
In the crossflow fan 1 having the rectifying protrusion 7, when the impeller 2 is rotated by driving means such as a motor, vortex is generated in the vicinity of the stabilizer 4 in the impeller 2 due to the rotation of the blades of the impeller 2. Thus, the flow as shown in FIG. 2 is configured.
[0019]
If attention is paid to the flow near the end of the rear guider 3 in this flow, the flow is as shown in FIG. When this is compared with the flow state in the shape in which the angle R is given to the thickness direction of the end portion of the rear guider shown in the conventional example, there is a large difference in the flow vortex regions S1 and S2 near the end portion. In the conventional example shown in FIG. 13, the vortex region portion is larger, and this vortex region portion becomes a factor that obstructs smooth flow and causes noise, but in this reference example , the streamline is a curved portion of the rectifying protrusion 7. , And the peeling from the rear guider 3 can be minimized. Therefore, the low-noise and efficient cross flow fan 1 can be provided.
[0020]
When the actual production of the rear guider 3 is considered, for example, if a mold dividing method is adopted as shown in FIG. 4 or FIG. 5, the rear guider 3 and the rectifying protrusion 7 can be easily molded integrally.
[0021]
FIG. 4 shows a first example of a molding tool for the rear guider 3, which is a production method using left and right split molds 13 a and 13 b in which a parting line 13 is formed on an extension of the center line in the thickness direction of the rear guider 3. FIG. 5 shows a production method using upper and lower divided dies 13c and 13d in which a parting line 13 is taken on a line passing through the central portion of the rectifying protrusion 7 in a direction perpendicular to the guide surface of the rear guider. In either case, the rectifying protrusion 7 can be easily formed simply by cutting the rectifying protrusion recess 18 on the divided surfaces of the molds 13a to 13d.
[0022]
4 and 5 are merely examples of the method of forming the rectifying protrusions, and the direction in which the dividing surface and the mold are pulled out can be freely set as long as molding is possible, and what method is used is integrally molded. Judging from the relationship with
[0023]
6 is a sectional view showing a protrusion shape of the suction side end portion of the Li Agaida. Rectifying protrusions 7 definitive in this reference example, the guide surface similarly rear guider 3 and reference example shown in FIG. 1, but in a state of protruding on both sides in a direction perpendicular thereto, as a molding method The suction side end of the rear guider 3 made of a plate-like material such as resin or metal is bent into an arc shape.
[0024]
Since the rectifying protrusion 7 is molded from a plate-like material, considering the flow state, the end portion 7a of the material is formed in a substantially C shape located in the direction opposite to the impeller 2 direction from the rear guider 3. not desirable.
[0025]
FIG. 7 shows a rear guider end portion of a cross flow fan according to an embodiment of the present invention . FIG. 7A is a sectional view of the mold, and FIG. 7B is a streamline diagram of the rear guider end portion. Other components are the same as those of the reference example shown in FIGS.
[0026]
In this example, unlike the reference examples shown in FIG. 1 to FIG. 6, the suction side rectification protrusion 7 of the rear guider 3 has a thickness that gradually changes in the thickness direction only in the fan (impeller 22) direction. The cross-sectional shape that protrudes only in the shape of an arc is a curved portion 7b on a curved surface, the edge side 7d that is continuous with the curved portion 7b is also a gentle curved shape, and the back side 7e is continuous with the back side of the rear guider 3. The back surface 7e and the curved portion 7d on the edge side intersect substantially at right angles, and the corner portion 7f has an R shape with a large curvature. The rear guider 3 is formed by integrally forming the rectifying protrusion 7 and an integrated portion 12 disposed in a direction opposite to the impeller direction with respect to the rear guider 3, for example, corresponding to a cabinet of an air conditioner. It is.
[0027]
As described above, when the rear guider 3 has an integrated molding portion in the direction opposite to the fan direction with respect to the rear guider 3, like the integrated portion 12, the core type for molding the rear guider 3 and the rectifying protrusion 7. 9 is pulled out to the arrow 8 side of FIG. 7A, and the slide core 11 having the parting line 13 along the back surface of the rectifying projection 7 is extracted in a direction 10 perpendicular to the extraction direction of the core mold 9. It can be easily molded.
[0028]
Further, since the rectifying protrusion 7 also has a shape protruding to the impeller 22 side, as shown in FIG. 7B, the flow of the fluid also becomes a streamline along the curved portion of the rectifying protrusion 7, and FIG. Compared to the conventional example shown, the fan-side vortex region S1 can be minimized, and noise reduction and good airflow characteristics can be obtained.
[0029]
FIGS. 8 (a) and 8 (b) show the improved rectifying protrusion of FIG. 7, in which the curvature of the corner portion 7f where the curved portion 7d on the edge side of the rectifying protrusion 7 and the back side 7e intersect is increased, and the rear guider 3, the opposite vortex region S2 is also made smaller.
[0030]
Further, as shown in FIG. 8A, as a molding method using the slide core 11, the parting line 13 is formed on the extension of the center line in the thickness direction of the rear guider 3 and the edge-side curved portion 7d of the rectifying protrusion 7 is formed. It is taken in the middle part. Even such a parting line 13 has the same effect as that shown in FIG.
[0031]
Further, the rear guider 3 having the integral part 12 shown in FIGS. 7 and 8 can be molded even if the existing mold is formed in a shape as shown in the conventional example. By improving (for example, forming the recess 18 in the molding portion of the rectifying protrusion 7), it is possible to improve noise and air volume at low cost. Needless to say, the direction in which the mold is pulled out is not limited to the direction shown in the figure. Further, even when the plate material is used, it is possible to create the shape of the rectifying protrusion 7 protruding only on the impeller side.
[0032]
9 are those from those shown rectifying protrusions 7 in Figure 7 is formed only in the opposite direction. FIG. 9A is a longitudinal sectional view of the mold, and FIG. 9B is a streamline diagram. In this example , the rectifying projection 7 has an arcuate or curved curved portion 7c that protrudes only on the opposite side of the guide surface of the rear guider, and a curved portion 7d on the edge side continuous to the curved portion 7d. The curved portion 7d on the edge side and the straight portion 7h on the guide surface side intersect substantially at right angles to form a corner portion 7g having a large curvature. And as shown to Fig.9 (a), the parting lines 13 of the split molds 13e and 13f are taken on the extension line of the guide surface 3a of a rear guider.
[0033]
FIGS. 10 (a) and 10 (b) show the improved rectifying protrusion 7 of FIG. 9, and the corner portion 7g between the straight portion 7h on the guide surface side and the curved portion 7d on the edge side has an R shape with a small curvature. It is said that. Then, the parting lines 13 of the split molds 13g and 13h are taken on an extension of the center line of the rear guider 3 in the thickness direction.
[0034]
In the example shown in FIGS. 9 and 10, unlike those shown in FIGS. 1 to 6 , the rectifying protrusion 7 has a shape protruding only in the direction opposite to the impeller 22 with respect to the guide surface of the rear guider 3. Even in such a shape, the vortex region of the streamline at the end of the rear guider 3 can be suppressed to a minimum as compared with the conventional example shown in FIG. 13, and noise reduction and good air flow characteristics can be obtained. In particular, in FIG. 10, the curvature of the corner portion 7g of the rectifying protrusion 7 is smaller than that in the shape shown in FIG.
[0035]
In this case as well, the direction in which the mold is pulled out is not limited to the direction shown in the drawing. Other configurations and operations are the same as those of the cross flow fan shown in FIGS.
[0036]
FIG. 11 is a longitudinal sectional view of a cross flow fan showing another embodiment of the present invention . In this example, an extension end 15 including a rectifying protrusion 7 made of a separate member is attached to the suction side end of the rear guider 3 with an attachment jig 16.
[0037]
It is significant to divide the extended end portion 15 including the rectifying protrusion 7 into separate parts from the rear guider 3. That is, the cross flow fan 1 has many design parameters such as the length and end shape of the rear guider 3 and the curved shape of the rear guider 3 because of its characteristics. It is necessary to consider. However, if the position determined once is further studied, and an end shape with higher fan efficiency and lower noise than the previous state is found, an extended portion including a rectifying protrusion 7 extended from the end of the rear guider 3 It is very convenient that the configuration only needs to be changed, and it is significant in that the subsequent investment can be reduced.
[0038]
In this example, the extended end 15 including the rectifying protrusion 7 is fixed to the end of the rear guider 3 by a holding tool such as a jig 16 and a holding means such as a screw. Various methods such as attaching the end 15 to the rear guider 3 as a base by welding, welding, etc., or in equipment having other parts such as a heat exchanger of an air conditioner, are attached and fixed to other parts. The extended end 15 including the rectifying protrusion 7 can be installed on the end side of the rear guider 3 by the method described above.
[0039]
In addition, the rectifying protrusion 7 in this example has a shape that protrudes on both sides with respect to the guide surface, similar to that shown in FIG. 1, but not limited thereto , as shown in FIGS. 7 to 10, Of course, it is possible to adopt a shape that projects only on one side.
[0040]
【The invention's effect】
As is clear from the above description, according to the present invention, the rear guider suction side end portion has a thickness that gradually changes in the thickness direction of the rear guider member, and the rear guider guide surface or back surface opposite to the rectifying protrusion is provided. Since the corner portion where the edge side of the rear guider continuous with the straightening protrusion intersects with the straight guide surface or the back surface has an R shape, the vortex region in the rear guider end portion flow is minimized. By suppressing to the limit, it is possible to provide an efficient cross flow fan with low noise.
In addition, when the rectifying protrusion is made of a separate member from the rear guider, only the rectifying protrusion is changed when a subsequent change is required, such as when finding a shape that can reduce noise and has good airflow characteristics. This can be an effective means in terms of sufficient.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal cross-sectional view of a cross flow fan showing a reference example of the present invention. FIG. 2 is a view showing the state of fluid flow. FIG. 3 is also a view of the flow of fluid in a longitudinal cross section near the end of a rear guider. Figure 4 shows same longitudinal sectional view of a mold showing the rear guider method of producing [5] also the rear guide end definitive in the longitudinal sectional view and FIG. 6 another reference example of a mold in another production method of showing how FIG. 7 shows the end of the rear guider according to the embodiment of the present invention , (a) is a longitudinal sectional view of the mold, and (b) is a streamline diagram of the end of the rear guider. FIG. 9A is a longitudinal sectional view of a mold in another production method, and FIG. 9B is a flow diagram of a rear guider end. FIG. 9A shows a rear guider end in another embodiment . Fig. 10 (b) is a streamline diagram of the end of the rear guider. Longitudinal sectional view of a mold in producing method, (b) is a schematic longitudinal sectional view of the cross-flow fan showing still another embodiment of the flow line diagram of the rear guider end [11] The present invention Figure 12 of the prior art Fig. 13 is a diagram showing the state of cross-flow fan flow. Fig. 14 is a diagram showing the state of flow near the end of the rear guider. Fig. 15 is a diagram of a fluid feeder related to the prior art of the present invention. Sectional view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crossflow fan 2 Crossflow type impeller 3 Rear guider 4 Stabilizer 5 Blowout part 6 Casing 7 Rectification protrusion 13 Parting line 15 Extension part 16 Jig

Claims (5)

A cross flow comprising a cross flow type impeller, a rear guider that covers a circumferential side surface in one direction across the impeller, and a stabilizer that is disposed close to the other circumferential side surface, and a casing having a blowout port portion In the fan, at the suction side end portion of the rear guider, there is a protrusion shape having a thickness that gradually changes in the thickness direction of the rear guider member, and an end rectification protrusion having a curved portion in which the protrusion cross-sectional shape is an arc shape or a curved surface shape. Provided,
The straightening protrusion has a shape protruding to either the impeller side or the opposite side with respect to the guide surface of the rear guider, and the guide surface or back surface of the rear guider opposite to the straightening protrusion is linear. The cross flow fan is characterized in that a corner portion where an end edge side of the rear guider continuous with the flow straightening projection intersects the linear guide surface or the back surface has an R shape .   A cross flow comprising a cross flow type impeller, a rear guider that covers a circumferential side surface in one direction across the impeller, and a stabilizer that is disposed close to the other circumferential side surface, and a casing having a blowout port portion In the fan, at the suction side end portion of the rear guider, there is a protrusion shape having a thickness that gradually changes in the thickness direction of the rear guider member, and an end rectification protrusion having a curved portion whose cross-sectional shape is an arc shape or a curved shape. A cross flow fan provided, wherein the rectifying protrusion is formed of a member different from the rear guider. The cross flow fan according to claim 2, wherein the rectifying protrusion has a shape protruding only toward the impeller side with respect to the guide surface of the rear guider. The cross flow fan according to claim 2, wherein the rectifying protrusion has a shape protruding only in a direction opposite to the impeller with respect to the guide surface of the rear guider. A fluid feeder using the cross flow fan according to claim 1.

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