Double-suction centrifugal closed impeller outlet side concave structure

A centrifugally closed, centrifugal pump impeller technology, used in non-variable volume pumps, components of pumping devices for elastic fluids, machines/engines, etc. Large difference in length and other problems, to achieve the effect of improving flow, reducing streamline length difference, and reducing vortex

Active Publication Date: 2016-03-09
江苏振华海科装备科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to structural reasons, the lengths of the streamlines on the inner and outer walls of the impeller flow channel in the prior art are quite different, resulting in different medium flow velocities at the inner and outer walls of the flow channel on the same side of the impeller. In addition to causing a certain amount of noise, the turbulent flow also reduces the hydraulic power of the pump. performance

Method used

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  • Double-suction centrifugal closed impeller outlet side concave structure
  • Double-suction centrifugal closed impeller outlet side concave structure

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Embodiment

[0019] This embodiment is matched with figure 2 In the double-suction centrifugal pump shown, the rated flow of the pump is Q=1080m 3 / h (single suction 540m 3 / h), than the number of revolutions n s =101.5, rated speed n=1450r / min, V-groove coefficient K' on the outlet side of the impeller is smaller than the number of revolutions, K'=1.03. Calculate D according to the present invention 2 =9.82 (n s / 100) -1 / 2 (Q / n) 1 / 3 =9.82 (101.5 / 100) -1 / 2 (540 / 1450) 1 / 3 =0.442, D'=(2-K')D 2 =(2-1.03)×0.442=0.429. The present invention provides a concave structure at the outlet of the impeller, which can reduce the length difference between the inner and outer walls of the flow channel, directly improve the flow of the medium in the flow channel, orderly flow reduces the vortex, thereby reducing the energy loss and noise of the centrifugal pump, and at the same time It also reduces the lift and shaft power of the double-suction centrifugal pump at the dead point.

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Abstract

The invention discloses a concave structure of an outlet edge of a double-suction centrifugal closed impeller. An impeller inlet and blades are designed according to the structure of a common centrifugal pump impeller. All the outlet edges of the impeller are respectively provided with a concave structure. The outer diameter of an outlet of the impeller of the structure D2 is equal to 9.82*(ns / 100)-1 / 2(Q / n)1 / 3. The smallest diameter of a V-shaped groove in the middle D' is equal to (2-K')D2. The concave structures are arranged on all the outlet edges of the impeller, so that the length difference between an inner wall streamline of a runner and an outer wall streamline of the runner can be reduced, flowing of media in the runner can be directly improved, and vortexes are reduced orderly. Consequently, the energy consumption and noise of a centrifugal pump are reduced, and the shutout point lift and the shaft power of the double-suction centrifugal pump are reduced.

Description

technical field [0001] The invention relates to a structural design of a pump impeller, in particular to a structural design of an impeller outlet of a matching double-suction centrifugal pump. Background technique [0002] The double-suction centrifugal pump is a general-purpose pump product, in which the impeller is the core component, and its structure directly affects the hydraulic performance of the pump. The supporting impellers in the prior art are all double-suction centrifugal closed impellers, and the impellers of this structure are symmetrically provided with flow channels bounded by the dividing wall, and the outlet edges of the blades on both sides are on the same circumference. The equal-diameter impeller outlet is convenient for casting and cutting. However, due to structural reasons, the length of the streamlines on the inner and outer walls of the impeller flow channel in the prior art is quite different, resulting in different medium flow velocities at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/22F04D29/66
Inventor 巫进陈金平邱勇姜大连唐晓晨
Owner 江苏振华海科装备科技股份有限公司
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