SU1521922A1 - Counterrotation-type two-stage axial fan - Google Patents

Abstract

The invention relates to a fan construction and makes it possible to reduce the noise level by making a thickened part of the profile of each blade 6 of the first stage facing the blades 7 of the second stage. In this case, the input edge 9 of each blade 7 of the second stage is coupled with the end 10 of a curved surface, the projection of which in the radial plane is formed by a radius not exceeding the height of the blade 7. 2 Il.

Description

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five

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of the second stage, the diffusivity of the interscapular channel of the first stage decreases, the probability of discharge from the blades 6 decreases and the noise level decreases, and mating the input edge 9 with the end of a curved surface 10 ensures a smooth flow of the edge of the flow to the input edge 9 of the blade 7 second stage, which also reduces the noise level of the fan.

The invention relates to a fan-1 | ostroeniyu, in particular to a two-stage axial fan of the counter revolving.

I The purpose of the invention is to reduce the level of noise.

Fig. 1 shows a fan, a longitudinal section; figure 2 - section aa in figure 1,

Claims (1)

A two-stage axial flow fan in | rotation includes a housing 1 | and successively: 1 installed in two electric motors 2 and 3 with rotors 4 and 5, on each of the j claims of the invention which are fixed profiled lanes 6 and .7 thickened part 8 of each blade 6 of the first stage pjoTopa 4 faces the blades 71 of the second stage of the rotor 5. The entrance 9 of each blade 7 of the second stage is matched with the curvilinear end of this surface 10, the projection of which is in the radial plane formed by a radius R not exceeding the height of 25 LI of the blade 7.  While the electric fan torus rotors A and 5 rotate towards each other, the air passes through the blades 6 and 7 Due to the thickening of the profile of the blades 6 of the first stage from the inlet side of the blades 7 20 thirty A two-way axial counter-rotating fan, comprising a housing and two electric motors with outer rotors installed in series, each with fixed profiled blades, characterized in that, in order to reduce the noise level, the thickened portion of the profile of each blade of the first stage faces towards the blades the second stage and the entrance edge of each blade of the second stage are matched with the end of a curvilinear surface, the projection of which in the radial plane is formed by a radius not exceeding Height of the blade. of the second stage, the diffusivity of the interscapular channel of the first stage decreases, the probability of discharge from the blades 6 decreases and the noise level decreases, and mating the input edge 9 with the end of a curved surface 10 ensures a smooth flow of the edge of the flow to the input edge 9 of the blade 7 second stage, which also reduces the noise level of the fan. Invention Formula Invention Formula A two-way axial counter-rotating fan, comprising a housing and two electric motors with outer rotors installed in series, each with fixed profiled blades, characterized in that, in order to reduce the noise level, the thickened portion of the profile of each blade of the first stage faces towards the blades the second stage and the entrance edge of each blade of the second stage are matched with the end of a curvilinear surface, the projection of which in the radial plane is formed by a radius not exceeding Height of the blade.