JP3532432B2 - Cross flow fan and fluid feeder using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross flow fan which constitutes a blower together with a drive motor, an indoor unit of an air conditioner equipped with the blower, an air cleaner, a humidifier, a dehumidifier, a fan heater, and a cooling device. The present invention relates to a fluid feeding device such as a ventilation device.

[0002]

2. Description of the Related Art In recent years, energy saving has been demanded from the viewpoint of global environmental problems and energy problems. In such a situation, in order to realize energy saving in a fluid feeder such as an air conditioner indoor unit, an air cleaner, a humidifier, a dehumidifier, a fan heater, a cooling device, and a ventilation device, low noise, and There is a strong demand for an air blowing system with good air flow characteristics.

The structure of a conventional general cross-flow fan will be described. FIG. 11 shows a cross flow fan having a general configuration. In FIG. 11, a cross flow fan 100 includes a cross flow type impeller 101, a rear guider 102 that covers a peripheral side surface in one direction with the impeller 101 interposed therebetween, and a stabilizer 103 provided close to the other peripheral side surface. Composed. Further, the casing 106 having the outlet 104 and the inlet 105 is provided. In such a configuration, the rotation of the impeller 101 causes a circulation vortex in the vicinity of the stabilizer 103 to generate a flow as shown in FIG. Noise is generated during the air blowing operation, and the noise can be divided into three types: electromagnetic noise for driving the motor, NZ noise related to the number of blades and rotation speed, and wind noise.

An invention for reducing the NZ sound among the above noises is disclosed in Japanese Patent Application Laid-Open No. 9-72297. In the present invention, as shown in FIG. 13, the blades 33 of the cross flow fan are twisted, and the blades 33 extend in the direction of the rotation axis O and are arranged in the circumferential direction. In the cross flow fan, a plurality of fan bodies 35a to 35f in which a plurality of blades 33 are arranged as described above are arranged in series in the rotational axis direction. Then, the blade 33 is formed in a twisted shape that is twisted around the rotation axis 0 as it goes from one side end surface of the blade 33 to the other side end surface thereof, thereby making it possible to reduce the NZ sound. The structure in which the blades of the cross flow fan are twisted in this way is also called skew, and those with a small twist angle have already been put to practical use and mass-produced.

Further, Japanese Patent Application Laid-Open No. 6-173886 discloses that the NZ noise is reduced by shifting the phase of the mounting angle of the blade of each cross flow fan.

[0006]

However, the fan having a skew has the following problems. That is, there is a restriction on the mold in mass production. Currently, mass-produced and practically used skews are formed by utilizing the width of the skew blade and using the draft angle of the die as the skew angle. Therefore, the degree of freedom when designing the skew angle is low,
Moreover, a thrust load is applied to the bearing to form a flow having an inclination with respect to the direction of the rotation axis, and measures against it are required.

In view of the above situation, the present invention improves the shape of the rear guider side, which is easy to mold,
It is an object to provide a cross flow fan that reduces NZ noise. It is another object of the present invention to provide a low noise and high efficiency fluid feeding device by utilizing the blower using the cross flow fan.

[0008]

DISCLOSURE OF THE INVENTION The present invention is directed to a cross-flow type impeller having a plurality of fan bodies connected to each other, a rear guider and a stabilizer arranged to sandwich the impeller and guide a fluid from a suction port to a discharge port. And the rear guider is arranged so that the area covering the peripheral side surface of the impeller is larger than the area covered by the stabilizer, and the stabilizer is arranged closer to the peripheral side surface of the impeller than the rear guider. It is a cross flow fan. The rear guider is provided with a continuous concave portion that is inclined in a direction perpendicular to the wind flow direction.

[0009] In addition, the present invention, the rear guider, the wind
With a continuous concave portion in the direction perpendicular to the flow direction,
The concave portion is provided for each series of fan bodies in the impeller.
It is characterized by being provided independently .

[0010] In addition, the present invention, the rear guider, the wind
A continuous recess with an inclination in the direction perpendicular to the flow direction
Comprising a Jo unit, characterized in that provided independently for each series of fan body in the impeller.

Further, the present invention includes: the cross-flow fan is a fluid feeding apparatus characterized in that a blower consisting of a drive motor for driving the crossflow fan.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments and references of the present invention will be described below.
The consideration will be described with reference to the drawings.

A reference example of the cross flow fan will be described in detail. Figure 1 is a longitudinal sectional view showing a reference example of cross-flow fan. In FIG. 1, a cross flow fan 1
The cross flow type impeller 2 is provided with a rear guider 3 and a stabilizer 4 which are disposed with the impeller interposed therebetween and guide the fluid from the suction port 5 to the discharge port 6. As shown in FIG. 13, the cross-flow type impeller 2 has a structure in which a plurality of fan bodies are arranged in series. The rear guider 3 is arranged so as to cover an area larger than the stabilizer 4 with respect to the peripheral side surface of the impeller 2. Stabilizer 4
It is arranged closer to the peripheral side surface of the impeller 2 than the rear guider 3. The part where the stabilizer 4 is close to
Compared to the rear gaida 3, it is a very small part. Rear Gaida 3
Is disposed only on the portion that covers the peripheral side surface of the impeller 2, so that the casing 7 that forms the outlet portion 5 is disposed on the portion beyond that.

Further, the rear guider 3 is formed with a concave portion 8 which is continuous in a direction perpendicular to the wind flow direction. The flow direction of the wind is the flow direction 7 as shown in FIG. When the cross-flow type impeller 2 is rotated by a driving means such as a motor in FIG. 2, the fluid forms a flow like a streamline 9 shown by the action of the fan. Figure 3 is a schematic perspective view of a case of installing a recessed portion 8 continuous in a direction perpendicular to the wind flow direction 7 to re Agaida 3.

With this structure, the gap between the rear guider 3 and the cross-flow type impeller 2 can be partly separated in the flow direction. The interference sound is most likely to be generated in the vicinity of the minimum gap between the rear guider 3 and the cross-flow type impeller 2. However, with the above-described configuration, the interference sound is generated without lowering the blowing performance. It is possible to reduce.

Next, a first embodiment of the present invention will be described. FIG. 4 is a first cross flow fan according to the present invention.
3 is a schematic three-dimensional view showing a rear guide portion used in the embodiment of FIG. In FIG. 4, a rear guide 1 of a cross flow fan
0 has a concave portion 11 provided with an inclination with respect to a direction perpendicular to the wind flow direction.

In the first embodiment, the groove, which is horizontal with respect to the longitudinal direction of the rotation axis of the impeller of the reference example , is constructed as an inclined structure. The reason why such a structure is adopted is that the concept similar to the skew described in the section of the problems to be solved by the prior art and the invention is applied to the rear guider 3 instead of the crossflow type impeller 2. With this structure, the gap between the cross flow impeller 2 and the rear guider 3 is also changed in the longitudinal direction,
This brings about a sound reduction effect.

In FIGS. 1 and 4, the concave portions 8 and 11 of the rear guide portions 3 and 10 of the cross flow fan are triangular depressions in the drawings, but the concave portions are circular or curved as shown in FIG. A sound reduction effect can be obtained even in the shape of a groove or in the shape of a groove as shown in FIG. Further, as shown in FIG. 7, the same effect can be expected even when the concave portion 12 is discontinuous. Further, as shown in FIGS. 8 and 9, the concave portion 1
3 has a dimension close to the continuous width of the fan body (width of the fan body) L (dimension not exceeding the continuous width), and a plurality of them are independently formed corresponding to each fan body. In this case, since it is possible to form one system for each fan body, the degree of freedom of the angle and the position of the concave portion can be further increased, and the tilt angle can be increased. A sound reduction effect is obtained. Even if the concave section has a three-dimensional curved surface instead of a constant cross section, the same effect can be expected.
In addition, a combination of a plurality of configurations may be applied to the above-exemplified ones. Also, additional effects to become when used with the skew-type fan and artificially increased adopt as constituting the skew angle ∎ You can be expected.

Next, a fluid feeding device according to a second embodiment of the present invention will be described. FIG. 10 is a vertical cross-sectional view of the air conditioner according to the present invention. The air conditioner of FIG.
The configuration is one in which the cross-flow fan of the first embodiment is incorporated, and the same parts as those in FIG. 1 are designated by the same reference numerals. Since this air conditioner has this cross flow fan, it can contribute to energy saving by reducing noise and improving efficiency of the air conditioner.

[0020]

With the above structure, in the cross flow fan of the present invention , the air volume characteristic is deteriorated due to the effect of the concave portion provided in the direction perpendicular to the air flow direction. It is possible to reduce the NZ noise of the cross flow fan without the need.

Further, in the cross-flow fan of the present invention , the NZ noise of the cross-flow fan is further reduced by the effect of the concave portion which is inclined with respect to the direction perpendicular to the wind flow direction. be able to.

Further, in the cross-flow fan of the present invention , since the concave portion is provided independently for each series of fan bodies in the impeller, the degree of freedom of the angle and position of the concave portion is further increased. The NZ noise of the cross flow fan can be further reduced by increasing the tilt angle.

Further, in the fluid feeding device of the present invention,
Since the cross flow fan of the present invention is provided, noise reduction and efficiency improvement of the device can be achieved, which contributes to energy saving.

[Brief description of drawings]

1 is a longitudinal sectional view showing a reference example of cross-flow fan.

FIG. 2 is an explanatory diagram showing a wind flow direction in a cross flow fan of a reference example .

FIG. 3 is a schematic three-dimensional view showing a rear guider in a cross flow fan of a reference example .

FIG. 4 is a schematic three-dimensional view showing a rear guide used in the first embodiment of the cross flow fan according to the present invention.

FIG. 5 is an enlarged schematic view showing another shape of the concave portion of the rear guider.

FIG. 6 is an enlarged schematic view showing still another shape of the concave portion of the rear guider.

FIG. 7 is a schematic three-dimensional view of the rear guider when the concave portion of the rear guider is discontinuous.

FIG. 8 is a schematic three-dimensional view of the rear guider when a plurality of concave portions is formed on the rear guider.

9 is an explanatory view showing a concave portion formation position of FIG. 8 with respect to a cross flow type impeller.

FIG. 10 is a vertical cross-sectional view of the air conditioner according to the present invention.

FIG. 11 is a vertical cross-sectional view showing a conventional cross flow fan.

FIG. 12 is an explanatory diagram showing a flow of wind in a conventional cross flow fan.

FIG. 13 is a perspective view of a cross flow fan whose blades are twisted.

[Explanation of symbols]

2 Cross-flow type impeller 3 rear gaida 4 Stabilizer 5 outlet 6 casing 7 Wind flow direction 8 concave part

Claims (4)

(57) [Claims] 1. A cross-flow type impeller having a plurality of fan bodies connected to each other, a rear guider and a stabilizer which are arranged with the impeller sandwiched therebetween and which guides fluid from an inlet to an outlet, the rear guider comprising: In a cross flow fan, the cross-flow fan is arranged so as to be larger in area than the stabilizer covers the peripheral side surface of the impeller, and the stabilizer is arranged closer to the peripheral side surface of the impeller than the rear guider. On the rear gaida, in the direction perpendicular to the wind flow direction
Cross flow fan, characterized in that example Bei concave portion continuously provided inclined. 2. A cross flow type impeller in which a plurality of fan bodies are connected to each other, a rear guider and a stabilizer arranged to sandwich the impeller and guiding fluid from an inlet to an outlet, the rear guider comprising: In a cross flow fan, the cross-flow fan is arranged so as to be larger in area than the stabilizer covers the peripheral side surface of the impeller, and the stabilizer is arranged closer to the peripheral side surface of the impeller than the rear guider. A cross flow fan characterized in that the rear guider is provided with a recessed portion that is continuous in a direction perpendicular to the flow direction of the wind, and the recessed portion is provided independently for each series of fan bodies in the impeller. . 3. A cross-flow type impeller having a plurality of fan bodies connected to each other, a rear guider and a stabilizer arranged to sandwich the impeller and guiding a fluid from an inlet to an outlet, the rear guider comprising: In a cross flow fan, the cross-flow fan is arranged so as to be larger in area than the stabilizer covers the peripheral side surface of the impeller, and the stabilizer is arranged closer to the peripheral side surface of the impeller than the rear guider. On the rear gaida, in the direction perpendicular to the wind flow direction
Includes a recessed portion continuous to provide a slope, the cross-flow fan, characterized in that provided independently for each series of fan body before Symbol impeller. 4. A fluid feeding device comprising a blower comprising the crossflow fan according to claim 1, 2 or 3, and a drive motor for driving the crossflow fan.