JPS5934497A - Cross flow fan - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates primarily to a cross-flow fan used in an air conditioner.

Configuration of conventional example and its problems 2 t-- A conventional air conditioner of this type is configured as shown in FIG. That is, 1 is an impeller, 2 is a tongue part, and 3 is a rear guider. When the impeller 1 rotates in a special direction, a forced vortex 2 having a center hole near the inner circumference of the impeller 1 is generated, which is indicated by an arrow. A through flow fl passes through the blade row once on the suction side and the discharge side.

f2. f3. ... is induced. Conventionally, in the Nar cross flow fan having such a configuration, the fan performance has been improved by mainly changing the shape and dimensions of the tongue portion 2 and the rear guider 3, but there are limitations. In other words, simply by changing one dimension of the casing shape, it is not possible to completely control the forced eddies that govern the crossflow fan flow, and the circulating flow V tends to become louder near the tongue and the eddy region becomes larger. Ta. Furthermore, it has been difficult to direct the flow into the blade row in an almost ideal state, especially in the suction region. For the reasons described above, it has been almost impossible to further improve the fan efficiency with the cross-flow fan of the conventional configuration.

OBJECT OF THE INVENTION Page 3 The present invention is intended to eliminate such conventional drawbacks, and by inserting a small-area control object that controls forced eddy into the cross-flow fan discharge area, the cross-flow fan suction and discharge flow can be controlled. The aim is to better control the cross 70-fan efficiency.

DESCRIPTION OF THE INVENTION To achieve this objective, the invention provides cross 70 - center 01 of the forced vortices generated in the impeller in the discharge area of the fan.
Located in a space consisting of a plane connecting the center 0 of the impeller, and a plane connecting the ridge line closest to the outer peripheral surface of the impeller on the end face of the tongue on the suction side and the center 0 of the impeller, and A thin control object for controlling the forced eddy is installed at a position relatively close to the outer peripheral surface of the impeller so as not to affect the flow through the crossflow fan. With this configuration, it is possible to maintain the position of the compulsory thin at an optimal position, suppress expansion of the thin, and increase the strength of the thin.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 2. In the figure, 1 is an impeller, 2 is a tongue, 3 is a rear guider, and 4 is a thin control object.

In a cross-flow fan with such a structure, 1. Among the circulating flows that constitute the forced vortices generated inside the impeller, the circulating flow away from the center of the hollow expands in the radial direction due to the presence of the thin control object 4. is suppressed. That is, the region of the circulating flow V that does not contribute to the flow rate can be narrowed, and as a result, the through-flow region can be widened, so that the flow rate performance can be improved. On the other hand, by inserting the eddy control object 4, the strength of the thin layer can be increased, and the through flow line f1 on the suction side. f2. f3
Since the blades can be laid horizontally compared to those shown in FIG. 1, the work of the blade cascade increases, and as a result, the pressure performance can also be improved. Note that in order to obtain an effect using the eddy control object 4, attention must be paid to its insertion position. In other words, the appropriate range of the insertion position is the center 01 of the forced vortex generated in the impeller, the plane containing the center ○ of the impeller, and the outer periphery of the impeller 1 on the end surface of the tongue 2 facing the suction side. Plane B including the ridge line 21 closest to the surface and the center ○ of the impeller 1
It is limited to a space that is not far away from the outer circumferential surface of the impeller in the radial direction and is not directly affected by the through-flow. By inserting the thin control object 4 into the above range, the through flow does not collide directly with the thin control object 4, but only the circulation flow V flows licking the front part of the thin control object 4. This is thought to be because the thinness can be controlled without causing an increase in fluid resistance. Therefore, if it deviates from the above range, it becomes impossible to control the thickness, and the inserted object only contributes to an increase in fluid resistance, which often has the opposite effect.

In addition, it is shown here as a thin control object 4 in FIG. 2.
I used a round bar because a round bar with a circular cross section can be inserted regardless of the direction of the flow. You can get the effect. However, in any case, it is better to make the control object as small as possible. Further, the cross 70-fan flow is a substantially two-dimensional flow, with substantially the same flow state in the axial direction except at both ends.

Therefore, by inserting the vortex control object 4 at an arbitrary position in the axial direction for a certain range of length, the entire flow in the axial direction can be controlled.

Effects of the Invention As described above, according to the present invention, in the cross flow fan discharge area, a plane connecting the center of the forced vortex and the center of the impeller;
In the end surface of the tongue facing the suction side, there is a space consisting of a plane that connects the ridge line closest to the outer peripheral surface of the N inspection vehicle and the center of the impeller, and that does not significantly affect the flow through the crossflow fan. A thin control object for controlling the forced eddy is installed at a position relatively close to the outer peripheral surface of the impeller to prevent unnecessary eddies from spreading. Since it is possible to form a thin layer, it is possible to improve flow performance. As a result, the angle of incidence of the through-flow to the blade row can be improved, and the pressure performance, especially in the suction region, can be raised to raise the head, greatly increasing the flow and pressure performance without increasing fluid resistance. It has excellent effects.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional cross flow fan, Figure 2
The figure is a sectional view showing one embodiment of the present invention. 1... Impeller, 2... Tongue, 3...
Rear guider, 4... Thin control object, 0... Center of impeller, 01... Center of forced vortex 01, A,
B...---plane. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 595-

Claims (2)

[Claims] (1) In the discharge area of a crossflow fan that has a casing consisting of a tongue and a rear guider, and an impeller, there is a plane connecting the center of the forced vortex and the center of the impeller, and the impeller on the end face of the tongue facing the suction side. Located in a space consisting of a plane connecting the outer peripheral surface, the closest ridgeline, and the center of the impeller, and with a cross 70
-Cross fan C1777° in which a thin control object for controlling the forced eddy is installed at a position relatively close to the outer peripheral surface of the impeller so as not to affect the flow through the fan. (2) A cross flow fan according to claim i, IJK, in which the thin control object is a round bar.