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Axial-flow pump

A technology for axial flow pumps and fluids, applied in axial flow pumps, pumps, special fluid pumps, etc., can solve problems such as head increase, achieve the effect of reducing the range of variation and stabilizing pressure characteristics

Inactive Publication Date: 2005-08-17
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, in the state where the flow rate is lower, not only reverse flow occurs at the outer peripheral portion of the impeller blade 9 on the inlet side, but also reverse flow occurs at the inner peripheral portion of the outlet side of the impeller blade 9. The outer peripheral side of the impeller blade 9, so the centrifugal force effect seen in centrifugal pumps increases the head (same figure (b))

Method used

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Embodiment Construction

[0028] figure 1 It is a schematic partial configuration diagram of an axial flow pump according to an embodiment of the present invention. The axial flow pump of this embodiment, because it is with Figure 4 The illustrated axial flow pump has the same structure, so detailed description of the structure is omitted, but it is an axial flow pump with a larger ratio of inner and outer diameters than conventional axial flow pumps. exist figure 1 The structure of the diffuser 6', the rear fixed body 7', the shaft body 8' and the impeller blade 9' of the axial flow pump is shown in the figure. Figure 5 corresponding figure.

[0029] In this embodiment, the inner and outer diameter ratio Dh / Dt, which is the ratio of the hub diameter Dh of the shaft body 8' constituting the rotor, to the rim diameter Dt of the impeller blade 9', is set to be 0.65 to 0.85. figure 2 It is a schematic diagram showing how the fluid flows in the rotor (impeller) of the axial flow pump according to t...

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Abstract

An axial-flow pump employs an increased boss ratio Dh / Dt, wherein Dh is the hub diameter of a rotary shaft of a rotor, and Dt is the tip diameter of impeller vanes of the rotor. Specifically, the boss ratio is 0.65 to 0.85, preferably 0.7 to 0.8.

Description

technical field [0001] The present invention relates to an axial flow pump with stable pressure characteristics, in particular to a suitable device for artificial heart pumps. Background technique [0002] Conventionally, as artificial heart pumps, various pumps such as beating type, turbo type, and roller pumps have been used. Among them, the turbine type is more suitable for miniaturization than others, and the axial flow pump is most likely to be miniaturized. [0003] Figure 4 This is a schematic cross-sectional structure diagram of a conventional axial flow pump. As shown in this figure, it generally has a cylindrical casing 1; a rotor 3, which is an impeller supported by rotating the central axis X in the casing 1 as a rotation axis; and rotating the rotor 3 The driving mechanism, through the rotation of the rotor 3, draws the blood from the front along the axial direction (in the Figure 4 in the right) to receive, to the rear (in the Figure 4 Middle is the left s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D3/02A61M1/10F01D1/04F04D3/00F04D7/00F04D29/18
CPCF04D3/00F04D29/181F01D1/04
Inventor 大久保刚长田俊幸佐野岳志宫本佑介宫川和芳
Owner MITSUBISHI HEAVY IND LTD