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multistage centrifugal compressor

A centrifugal compressor and centrifugal impeller technology, applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of reducing thrust load, compressor efficiency, compressor mechanical reliability, etc., and achieve high The effect of efficiency on mechanical reliability

Inactive Publication Date: 2017-01-18
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the multistage centrifugal compressor described in Patent Document 1 focuses on limiting the amount of movement of the pinion shaft as the output shaft in the thrust direction (axial direction), and does not consider reducing the thrust load (load in the thrust direction) generated on the output shaft.
[0006] Therefore, in the multi-stage centrifugal compressor described in Patent Document 1, there is a possibility that the efficiency of the compressor due to the frictional loss of the sliding part will decrease due to the thrust load generated on the output shaft, and the mechanical reliability of the compressor will decrease.

Method used

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no. 1 Embodiment approach

[0027] First, while referring to Figure 1 to Figure 6 The first embodiment of the present invention will be described.

[0028] figure 1 It is a horizontal sectional view showing the schematic structure of the multi-stage centrifugal compressor according to the first embodiment of the present invention.

[0029] figure 1 The shown multi-stage centrifugal compressor has: an engine (not shown); a speed increaser unit 100 that transmits the rotational driving force of the engine; compressor units 1 to 3 of the first to third stages that compress A fluid (gas); a cooling device (not shown) that cools the compressed fluid (gas) that has become high temperature; and a control unit (not shown) that perform unified control.

[0030] The input shaft 4 of the step-up unit 100 is connected to a rotation shaft (not shown) of the engine via a coupling (not shown). A main gear 20 serving as a large gear is attached to the input shaft 4 . Two pinion gears 21 and 22 (second gear) mesh w...

no. 2 Embodiment approach

[0070] Next, refer to Figure 7 , The second embodiment of the present invention will be described focusing on points that are different from the first embodiment described above, and the description of the same points will be appropriately omitted.

[0071] Figure 7 It is a horizontal sectional view schematically showing the multistage centrifugal compressor of the second embodiment.

[0072] like Figure 7 As shown, the multistage centrifugal compressor of the second embodiment is different from the first embodiment which is a three-stage compressor in that it is a four-stage compressor. That is, a third-stage centrifugal impeller 13 is provided at one end of the output shaft 6 , and a fourth-stage centrifugal impeller 14 on the most downstream side of the fluid flow is provided at the other end of the output shaft 6 .

[0073] In the second embodiment, as in the first embodiment, the outer diameter D1 of the first-stage centrifugal impeller 11 is set larger than the out...

no. 3 Embodiment approach

[0077] Next, refer to Figure 8 , Regarding the third embodiment of the present invention, the description will focus on the points different from the above-mentioned second embodiment, and the description of the common points will be appropriately omitted.

[0078] Figure 8 It is a horizontal cross-sectional view schematically showing a multistage centrifugal compressor according to a third embodiment.

[0079] like Figure 8 As shown, the multi-stage centrifugal compressor of the third embodiment is different from the second embodiment in that the rotation directions of the main wheel and the wheel are reversed. That is, the main gear is a right-handed helical gear, and the main gear is a left-handed helical gear.

[0080] In the third embodiment, as in the second embodiment, the outer diameter D1 of the first-stage centrifugal impeller 11 is set larger than the outer diameter D2 of the second-stage centrifugal impeller 12 . In addition, the outer diameter D3 of the thi...

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Abstract

The present invention provides a multistage centrifugal compressor of reducing the thrust generated in the output shaft of the load, being high efficiency and being high mechanical reliability. The multistage centrifugal compressor comprises: an input shaft driven by an engine (4); a main gear (20) provided on the input shaft (4); a pinion (21) engaged with the main gear wheel; an output shaft (5) for setting the pinion (21); a centrifugal impeller (11) at one end of the first stage of the output shaft; and a secondary centrifugal impeller (11) located at the other end (5) of the output shaft and located over the first stage centrifugal impeller (11 ) section 2 of the centrifugal impeller by fluid flow downstream side of the stage (12). In addition, the outer diameter (D1) of the first-stage centrifugal impeller (11) is larger than that of the second-stage centrifugal impeller (12).

Description

technical field [0001] The present invention relates to a multistage centrifugal compressor, and more particularly, to a multistage centrifugal compressor having an input shaft provided with a main gear driven by an engine, and one or more output shafts provided with a gear meshing with the main gear. Background technique [0002] As background technology in this technical field, there is Japanese Unexamined Patent Application Publication No. 2008-231933 (Patent Document 1). In this gazette, the following gear-driven turbo compressor is disclosed, that is, the gear-driven turbo compressor has: "a large gear (main gear) 12 driven to rotate by an external drive device (engine); meshed with the large gear, high-speed Rotating pinion (wheel) 14; fixed on the pinion shaft (output shaft) 13, impeller 16 rotating at high speed around its axis; fixed on the pinion shaft, slidably supporting the large gear On the side, the thrust ring 18 that transmits the thrust of the pinion shaft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D17/12F04D25/02F04D29/28F04D29/051
CPCF04D17/122F04D25/02F04D29/051F04D29/286
Inventor 田中征将西田秀夫
Owner HITACHI LTD