The impeller channel radial fan

 

The invention is intended for use in ventilyatorostroeniya. The impeller contains the primary disk with the ending. The diameter of the main drive ending equal to 1.05...1,15 external diameter of the blades. The diameter of the opaque disk with a tip equal to 1,1 1,2...external diameter of the blades. Forming ends of covering disk is made straightforward. Forming ends of the primary disk is made curved in the form of an arc of a circle. Between forming the primary drive and the ending of covering disk is formed pressurewise channel. Provides improved pressure-flow rate characteristics and efficiency of the fan. 3 C.p. f-crystals, 4 Il.

The invention relates to the field of ventilation technology, namely the design of the impeller with backward-curved blades channel radial fan.

The prior art impeller radial fans. Thus, in the description of the invention according to the international application 97/09535, IPC F 04 D 29/28; F 04 D 29/66, date of publication, 13.03.1997, [1], presents the impeller channel radial fan, which includes a core and covering disks with the tip placed between the discs backward curved blades, the external diameter of which murininae. Feature known of the invention, taken as the closest analogue is the fulfillment of forming a primary drive and ending stocks disk in radial cross-section with expanding channel that may lead to detachment of the boundary layer flow from the top of the disk. To prevent separation of flow (boundary layer) is necessary to reduce the width of the blades.

Solved technical challenge is the improvement of the pressure-flow rate characteristics and efficiency of a centrifugal fan by eliminating flow separation from the surface of the disk when the width of the impeller 0.25, the external diameter of the blades. The technical result is to increase the width of the blades of the impeller to 0.42 or more of the diameter of the blades.

The invention consists in the following.

The impeller of a centrifugal fan, as the closest analogue [1] , contains the major and covering disks with the tip placed between the discs backward curved blades, outer diameter smaller than the diameter of the main and top drives the tip, but unlike most similar analogue the diameter of the main drive with a tip equal to 1.05...1,15, while the diameter of the opaque disk with a tip equal to 1,1 1,2...external diamani pressurewise channel.

The impeller charaterizes what constitutes the ending of covering disk is made straightforward.

In addition, the impeller characterizes what constitutes the ending of the main disk is made of a curved, in particular in the form of an arc of a circle.

Presents signs form a set and are essential for solving the task and achieve the stated technical result.

Indeed, the execution of the impeller of a centrifugal fan, as the closest analogue [1], contains the core and covering disks with the tip placed between them backward curved blades, outer diameter smaller than the diameter of the main and covering disks from the tip, as in the closest analogue, provides the conditions for steady airflow wrap disks in the impeller.

Performing a basic disk with a tip diameter equal to 1.05...1,15, and coating the disk with a tip diameter equal to 1,1 1,2...external diameter of the blades, and running back discs with education in radial cross-section forming between the primary disk and the tip surface of the disk pressurewise channel provides for the expansion of the flow in rotating with the surface of the covering disk. This allows you to increase the width of the blades to 0.42 outer diameter of the blades of the impeller while maintaining the diameter of the blades of the impeller and the flow rate at the outlet of the impeller.

The implementation of the impeller with a tip surface of the disk with a rectilinear generatrix simplifies the manufacturing technology of covering disk when the achievement of the technical result.

The implementation of the impeller with the ending of the main drive with a curvilinear generatrix allows you to create a thread with the required parameters. Execution generatrix ending in the form of an arc of a circle while maintaining pressurewise channel in radial cross-section forming between the primary drive and zakonczonej covering disk also simplifies the manufacturing technology of the impeller when the achievement of the stated technical result.

The invention is illustrated by drawings.

In Fig.1 presents the impeller when viewed from the side.

In Fig. 2 shows a side view of the impeller with a straight generatrix ending stocks disk.

In Fig.3 shows a section 1-1 in Fig. 1.

In Fig.4 shows a graph of the dependence of the coefficient of static pressureSVfrom the coefficient of dischargeSV= f().

The impeller of the centrifugal fan is arranged as follows.

The impeller includes a base 1 and top 2 discs located between the blades 3, backward curved, the shaft 4 of the impeller. Ends 5 and 6 of the main and covering disks, starting from the junction of the outer ends of the blades 3 to the disks 1 and 2, increase the diameter of the disks. Between the generatrix 7 primary drive 1 (continued outside of the disk 1), and forming the ends 6 of the covering disk 2 in the radial cross section is formed pressurewise channel. Ends 5, 6 can be performed at the same time with the corresponding disk 1 and 2, as well as the individual parts are connected to the corresponding disk 1 or 2 (Fig. not shown).

The diameter of the main disk 1 with a tip 5 exceeds the diameter d of the circle described with the rotation of the outer ends of the blades 3 (or outer diameter of the blades), and outside (1,05...1,15)d, the diameter of the covering disk 2 with a tip 6 does not extend beyond the (1,1 1,2...) d. The tip 5 is performed as a continuation of the main disk 1, coupled with the surface of the disk 1, and can be either rectilinear generatrix (Fig.2), and forming in the form of a curve, for example, 2-th order, in particular 2 and can be executed as rectilinear, and curved while maintaining radial cross-section pressurewise channel between the generatrix 7 primary drive 1 and forming the ends 6 of the covering disk 2.

The impeller of a centrifugal fan operates as follows.

During the rotation of the impeller, for example, by application of torque to the shaft 4 on the surface of the disks 1, 2 with the ends 5, 6 and the blades 3 are formed boundary layer, whose thickness increases as the distance from the axis of rotation. The interaction of the boundary layer on the surface of the covering disk 2 with the boundary layer on the blades 3 results when reaching a certain thickness to its isolation, which is accompanied, as shown in Fig.4, a sharp decrease of the coefficient of static pressure impeller. To prevent separation of the boundary layer it is necessary to reduce the height h of the blades 3 of the impeller. The presence of edge lines 5 and 6 with the formation in radial cross-section between the generatrix 7 primary drive 1 and forming the ends 6 of the top disc 2 pressurewise channel provides a flow acceleration on the surface of the disks 1, 2, compared with the closest analogue that is delaying boundary layer separation. This allows you to increase, as shown in theu22and the coefficient of discharge= 4Q/(d2u2) fan with the stated impeller, where Particlestatic pressure, PA;- gas density, kg/m3; Q is the flow rate of gas passing through the impeller, kg/m3; u2=nd/60 - peripheral speed of the end blades 3, m/s; n is the rotational speed of the impeller rpm

In the result, it is possible to increase the width of the blades 3 to 0.42 d or more and reduce the diameter of the impeller and the fan as a whole while maintaining the performance of the fan, the prior art allows to implement the invention without additional inventive creativity, and the ends 5, 6, discs 1, 2 and blades 3 can be optimized depending on the operating conditions and requirements of the impeller and fan requirements.

Claims

1. The impeller channel radial fan, which includes a core and covering disks with the tip placed between the discs backward curved blades, the diameter of which is less than diamet the diameter of the opaque disk with a tip equal to 1,1 1,2...external diameter of the blades, with the formation forming between the primary drive and the ending of covering disk pressurewise channel.

2. The impeller under item 1, characterized in that the forming ends of covering disk is made straightforward.

3. The impeller under item 1, characterized in that the forming ends of the primary disk is made curved.

4. The impeller under item 1, characterized in that the forming ends of the main drive is made in the form of an arc of a circle.

 

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FIELD: mechanical engineering; air blowers, compressors and outer vane machines.

SUBSTANCE: invention relates to electric compressors, turbocompressors for supercharging internal combustion engines, air blowers and other vane machines. Proposed high-speed rotor of blower provides practically complete elimination of rotor unbalance owing to provision of minimum tolerable deformation of shaft when rotor parts pack is tightened by nut, thanks to which vibration and noise of turbocompressor in operation are considerably reduced, service life of bearings is increased and rubbing of impeller or turbine of compressor against base members is prevented which improves operating capabilities and reduces energy consumption. For this purpose, according to first design version, rotor is furnished with plates, each placed between end face of compressor impeller bushing and nut. Said plate has concave spherical surface at one side adjoining convex spherical surface of nut, and at other side, flat surface adjoining flat end face of bushing of compressor impeller. Ring groove is made on each bushing of compressor impeller between blades and end face of compressor impeller bushing. According to second version, ring groove is made on each bushing of compressor impeller between blades and end face of compressor impeller bushing provided with concave spherical surface adjoining convex spherical surface of nut.

EFFECT: improved operating capabilities, reduced energy consumption.

3 cl, 2 dwg

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