Low-resistance square elbow

Abstract

The invention disclose a novel low-resistance square elbow comprising a first inner arc surface, a second inner arc surface, an outer arc surface and two sides, wherein the first inner arc surface is connected with the second inner arc surface; the first inner arc surface, the second inner arc surface and the outer arc surface are respectively connected with the two sides to form a rectangular channel; the radius and the arc length of the first inner arc surface are more than the radius and the arc length of the outer arc surface; the radius and the arc length of the outer arc surface are more than radius and the arc length of the second inner arc surface; and circle centers of the first inner arc surface and the second inner arc surface are respectively arranged on elongated surfaces of an inlet section and an outlet section. Because of the specific design of the elbow, the novel low-resistance square elbow simultaneously eliminates a volution region generated by passing through the inner arc surfaces of the elbow by the fluid and a volution region generated at a joint part of the elbow and a straight pipe so as to finally achieve the effect of reducing the resistance when the fluid passes through the elbow.

Description

technical field [0001] The invention relates to a partial component of ventilation and air conditioning, in particular to a low-resistance square elbow. Background technique [0002] Elbows are pipe fittings that change the direction of fluid flow. In curved pipelines, due to the turning of the fluid, there is a centrifugal force from the center of curvature to the outer arc of the pipe, which makes the fluid transition from the straight section of the pipeline to the curved pipe section (at the turn Before the end), the pressure on the outer arc surface increases and the pressure on the inner arc surface decreases. Therefore, the flow velocity of the fluid at the outer dome will decrease, while the flow velocity of the fluid at the inner dome will correspondingly increase. Therefore, the diffusion effect appears near the outer arc surface, while the contraction effect appears near the inner arc surface. When the fluid transitions from the curved pipe section to the straig...

AI Technical Summary

Problems solved by technology

The secondary flow plays an important role in the redistribution of the axial flow velocity of the elbow. The redistribution process consumes the energy of the primary flow and increases the local resistance loss of the elbow.

However, because it needs to add guide vanes to the curved pipe, its manufacture and installation are relatively complicated, and the cost will be relatively high

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