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Centrifugal fluid machine

A fluid mechanical and centrifugal technology, applied in mechanical equipment, liquid fuel engines, components of pumping devices for elastic fluids, etc., can solve the problems of no shutters, etc., to maintain the range of motion, sufficient strength and manufacturability Effect

Active Publication Date: 2014-10-08
HITACHI IND PROD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impeller 1 is composed of a disc (hub) 11 connected to the main shaft, a side plate (shield) 12 positioned in a direction facing the disc 11, and a plurality of circumferentially arranged rings sandwiched by the hub 11 and the shroud 12. Wing 13 configuration, but there are cases where there is no shutter

Method used

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Examples

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Embodiment 1

[0041] Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

[0042]As a constituent element of the centrifugal fluid machine of this embodiment, and Figure 15 The conventional centrifugal fluid machine shown is similarly composed mainly of a centrifugal impeller 1 for imparting energy to a fluid by rotation, a rotating shaft 2 for rotating the impeller, located on the radially outer side of the impeller and allowing the flow in from the outlet of the impeller. The diffuser 3 that converts the dynamic pressure of the fluid to the static pressure, and the return channel 4 that is located downstream of the diffuser 3 and guides the fluid to the downstream flow path are constituted. The impeller 1 is composed of a disk (hub) 11 connected to the main shaft 2, a side plate (shield) 12 positioned in a direction facing the disk 11, and multiple blades arranged in the circumferential direction sandwiched by the hub 11 and...

Embodiment 2

[0061] A second embodiment of the centrifugal fluid machine of the present invention is shown below.

[0062] In the centrifugal fluid machine of this embodiment, in the centrifugal fluid machine having the same constituent elements (impeller, diffuser, return channel, etc.) Figure 10 As shown in (a), the shroud leading edge diameter 121 of the impeller is larger than the hub leading edge diameter 111, and as Figure 10 As shown in (b), when the impeller is viewed from the upstream direction of the rotating shaft (suction direction), the shroud side is inclined backward relative to the direction of rotation relative to the hub side near the rear edge of the impeller blade, and the front edge of the impeller blade is , with respect to a line 61 drawn radially from the center of rotation of the impeller, the hub side of the impeller is the same or located in front of the direction of rotation compared to the shroud side.

[0063] In this structure, first, the shroud side is ti...

Embodiment 3

[0074] A third embodiment of the centrifugal fluid machine of the present invention will be described below.

[0075] In the centrifugal fluid machine of this embodiment, in the centrifugal fluid machine having the same constituent elements (impeller, diffuser, return channel, etc.) as in Embodiment 1 and Embodiment 2, the following centrifugal impeller is provided, Such as Figure 14 As shown in (a), in the vicinity of the trailing edge of the impeller blade, the shroud side is inclined backward relative to the direction of rotation than the hub side, and at a predetermined point, such as Figure 14 As shown in (b), let the impeller incident angle i 1 0° or less.

[0076] In this embodiment, first, by making the shroud side in the vicinity of the trailing edge of the impeller blade backward relative to the direction of rotation relative to the hub side, as described above, the static pressure in the space between the blades will be reduced due to the change in the direction...

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PUM

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Abstract

A centrifugal fluid machine is provided. In order to suppress the separation and slowdown of a flow in the vicinity of the front edge of a blade suction surface shroud of an impeller when the flow rate is reduced while reducing secondary flow loss within the impeller to thereby maintain the operating range of the impeller in a centrifugal fluid machine, the shroud side is inclined further backward with respect to a rotation direction than the hub side at the back edge of an impeller blade when the impeller is viewed from a suction direction that is the upstream direction of a rotating shaft. Moreover, in adjacent two impeller blades, the shroud side of a blade located behind in the rotation direction of the impeller overlaps, in the vicinity of the front edge of the blade, with a blade located in front in the rotation direction.

Description

technical field [0001] The present invention relates to a centrifugal fluid machine having a centrifugal impeller, and more specifically, to a blade shape of the centrifugal impeller. Background technique [0002] A centrifugal fluid machine having a rotating centrifugal impeller has conventionally been used in various factory equipment, air conditioners, hydraulic pumps, and the like. In response to increasing demands for reduction of environmental load in recent years, these centrifugal fluid machines are required to have higher efficiency and wider operating range than before. [0003] Use below Figure 15 An example of a conventional centrifugal fluid machine will be described. Figure 15 is a cross-sectional view of a conventional centrifugal fluid machine on a plane passing through the impeller rotation shaft. Conventional centrifugal fluid machines mainly consist of a centrifugal impeller 1 for imparting energy to the fluid through rotation, a rotating shaft 2 for ro...

Claims

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Application Information

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IPC IPC(8): F04D29/24
CPCF04D17/10F04D29/30F04D29/284F04D29/681F05D2250/38
Inventor 平馆澄贤新川泰上甲圣士伊藤俊雄
Owner HITACHI IND PROD LTD
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