JPH0587295U - Cylindrical impeller - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a tubular impeller 5 capable of improving the air blowing performance and reducing noise during operation. [Structure] A large number of blades 3 extending in the axial direction are formed on an end surface of an annular or disc-shaped support plate 2 at intervals 4 in the circumferential direction. Each blade 3 is provided with a gap 7 or a large number of small holes penetrating in the thickness direction. When the blades 3 are rotated, when the air passes through the intervals 4 between the blades 3, a part of the air flows through the gap 7 or the small holes to the side where the pressure is low, so that the pressure difference between the both sides of the blades 3 is reduced. Make it smaller. Therefore, the flow of air in the tubular impeller 5 is controlled,
It is possible to prevent the generation of eddy currents and turbulence and reduce the sound volume.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tubular impeller used for a cross flow fan, a sirocco fan, etc.

[0002]

[Prior Art]

 Conventionally, as a cylindrical impeller as described above, there is one disclosed in Japanese Patent Publication No. 54-25643. This cylindrical impeller will be described with reference to FIGS. In FIG. 8, reference numeral 1 denotes an element made of a synthetic resin integrally molded product, and a large number of blades 3 extending in the axial direction are circumferentially arranged on one end surface of an annular or disc-shaped support plate 2. It is formed integrally with a space provided. Further, each blade 3 is formed in a blade-shaped cross-sectional shape that is inclined with respect to the radial direction of the element 1 and is curved in an approximate arc shape.

As shown in FIG. 9, the tips of the blades 3 of the element 1 in the previous stage are engaged and held on the support plate 2 of the element 3 in the next stage and fixed by adhesion or ultrasonic welding. By repeatedly connecting the required number of elements 1 in the axial direction, the tubular blade wheel 5 is constructed. As shown in FIG. 10, the above-mentioned tubular impeller 5 is used for a cross-flow fan, is housed in the casing 6, and is rotated clockwise by an electric motor (not shown), as shown by an arrow in FIG. Air is sucked into the blades 5 from the outer peripheral side of the tubular impeller 5 through the intervals 4 between the blades 3, and is blown out of the impeller 5 from a position different from the suction position through the interval 4 to be blown.

[0004]

[Problems to be solved by the device]

 Since the conventional tubular impeller has the above-mentioned configuration, when the suctioned or blown air passes through the space 4, the air flowing near the convex curved surface 3a on one side of the blade 3 and the air flowing near the concave curved surface 3b on the other side are generated. There is a difference in flow velocity and pressure from the flowing air, and the former pressure is lower and the latter pressure is higher. For this reason, there are problems that the vortex 11 is disturbed in the impeller 5 or a small vortex that disturbs the flow of the air flowing therethrough is generated, which lowers the blowing performance and causes a loud noise during operation.

An object of the present invention is to solve the above-mentioned problems and to provide a tubular impeller that can improve the blowing performance and can reduce the noise during operation. is there.

[0006]

[Means for Solving the Problems]

 This invention relates to a tubular impeller in which a plurality of blades extending in the axial direction are formed at predetermined intervals in the circumferential direction on an end surface of an annular or disc-shaped support plate, and the blades are oriented in the thickness direction. Each blade is formed with a pressure equalizing gap or a large number of small holes penetrating therethrough along the longitudinal direction.

[0007]

[Action]

 When the tubular impeller of this invention is used for a cross-flow fan or a sirocco fan and is rotated, when the air passes through the gap between the blades, it passes through the gaps or small holes penetrating the vanes in the thickness direction, and the air By partially flowing from the concave curved surface side of the blade to the convex curved surface side, the pressure difference between the air on the concave and convex curved surface sides of the blade is reduced, and the generation of vortex flow in the cylindrical impeller is suppressed. It is possible to control the flow of air to prevent turbulence from occurring in the air flow, improve air blowing performance, and reduce operating noise.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show the element 1 of the tubular impeller of the first embodiment. This element 1 has a width of about 0.05 mm to 1.00 mm for each blade 3 during injection molding and is used for narrow pressure equalization. The gap 7 is formed by penetrating the blade 3 in the thickness direction over the entire length of the blade 3 in the longitudinal direction.

3 and 4 show the element 1 of the tubular impeller of the second embodiment. This element 1 is obtained by post-processing the conventional element shown in FIG. 8 and having a radius of 0. A large number of small holes 8 for pressure equalization of about 05 mm to 1.00 mm are arranged in a row at required intervals over the entire length of the blade 3 in the longitudinal direction, and the blade 3 is formed so as to penetrate therethrough. The structure of the element 1 of the first and second embodiments other than that described above is the same as that of the conventional element shown in FIG. 8, and is the same as FIG. 8 to FIG. 10 in each of FIGS. Reference numerals indicate corresponding parts. Although not shown, in the elements of the first and second embodiments, a required plurality of elements are axially connected in the same manner as the conventional tubular impeller shown in FIG. As a result, these impellers are used in the transverse flow fan shown in FIG. 10 in the same manner as the cylindrical impeller.

FIG. 5 shows an element 1 of the tubular impeller of the third embodiment. This element 1 has an outer peripheral portion 9 of a blade on one end surface of an annular support plate 2 and a blade on the other end surface of the support plate 2. The inner peripheral portion 10 of each is formed by injection molding. Then, as shown in FIG. 6, by connecting several required elements in the axial direction by adhesion or ultrasonic welding, as shown in FIG. 7, as shown in FIG. The cylindrical impeller 5 of the third embodiment is provided with the blade 3 having the interval 7 having the same width as that of the first embodiment between the inner peripheral portion 10 and the inner peripheral portion 10.

Although not shown in the drawings, in the cylindrical impeller of the third embodiment, the element at one end is assumed to have only the outer peripheral portion of the blade extending to one end face of the disc-shaped support plate, and the other end It is assumed that the element has only the inner peripheral portion of the blade extending to the other end surface of the disk-shaped support plate. The cylindrical impeller of the third embodiment having the above-mentioned configuration is also used for the cross flow fan shown in FIG. 10 in the same manner as the cylindrical impeller.

The tubular impellers 5 of the first, second, and third embodiments configured as described above are used for a cross-flow fan, and when rotated in the clockwise direction by an electric motor, air is blown on the outer periphery of the cylindrical impeller 5. It is sucked into the impeller 5 from the side through the gap 4 between the blades 3, and is blown out of the impeller 5 through the gap 4 from a position different from the suction position. When the air passes through the gaps 4 between the blades 3, a gap 7 or a small hole 8 is formed in each blade 3, so that a part of the air flows from the concave curved surface side 3b of the blade 3 to the convex curved surface side. By flowing into the 3a side, the pressure difference between the concave and convex curved surfaces 3a and 3b of the blade 3 is reduced, the air flow is prevented from being disturbed in the impeller 5, and the vortex is generated. Can be suppressed.

This invention can be applied not only to a cross flow fan but also to a sirocco fan, etc. Further, a large number of blades can be formed from both end faces of a disc-shaped support plate without connecting a plurality of elements. It can also be applied to a single-member tubular impeller in which the tips of these blades are extended and connected by a ring.

[0014]

[Effect of the device]

 As described above, the present invention provides a tubular impeller in which a large number of blades extending along the axial direction are formed at predetermined intervals in the circumferential direction on the end surface of an annular or disc-shaped support plate. Since the pressure equalizing gaps or a large number of small holes that penetrate the blades in the thickness direction are formed in the respective blades along the longitudinal direction, the following effects can be obtained.

That is, when the tubular impeller of the present invention is used for a cross flow fan or a sirocco fan and rotated, a gap or a small hole penetrating the blades in the thickness direction when air passes through the gaps between the blades. Part of the air then flows from the concave curved surface side of the blade to the convex curved surface side, reducing the pressure difference between the air on the concave and convex curved surface sides of the blade, and creating a vortex flow inside the cylindrical impeller. It is possible to control the air flow to prevent turbulence from occurring in the air flow by suppressing the generation of airflow, improve the air blowing performance, and reduce the noise during operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an element of a tubular impeller according to a first embodiment of the present invention.

FIG. 2 is a partial perspective view of the blade shown in FIG.

FIG. 3 is a perspective view showing elements of a tubular impeller according to a second embodiment of the present invention.

FIG. 4 is a partial perspective view of the blade of FIG.

FIG. 5 is a perspective view showing an element of a tubular impeller according to a third embodiment of the present invention.

FIG. 6 is a partial perspective view in which the elements of the third embodiment are connected.

FIG. 7 is a cross-sectional view showing a blade portion of a third embodiment.

FIG. 8 is a perspective view showing elements of a tubular impeller of a conventional example.

9 is a perspective view of a tubular impeller in which the elements of FIG. 8 are connected.

10 is a cross-sectional view of a cross-flow fan using the tubular impeller of FIG.

[Explanation of symbols]

 1 Element 2 Support Plate 3 Blade 4 Spacing 5 Cylindrical Impeller 7 Spacing 8 Small Hole

Claims (1)

[Scope of utility model registration request] 1. A tubular impeller in which a large number of blades extending in the axial direction are formed at predetermined intervals in the circumferential direction on an end surface of an annular or disc-shaped support plate, and the blades are formed in the thickness direction. A cylindrical impeller characterized in that a pressure equalizing gap or a large number of small holes penetrating therethrough are formed in each blade along the longitudinal direction.