Fluid device

Patent metadata

Field	Value
Publication number	US-10975728-B2
Application number	US-201916546609-A
Country	US
Kind code	B2
Filing date	Aug 21, 2019
Priority date	Mar 29, 2017
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

Flanges of half bodies provided in a compressor casing are fastened by multiple bolts and a multi-hole washer shared by two or more adjacent bolts. When F is fastening force, T is a thickness of the washer, θ is a distribution angle of the fastening force, Rb is a radius of the bolt, R is a radius of a distribution range of the fastening force on a bearing surface, A is an area of the distribution range on the surface, a is an area of a distribution range of the fastening force on a mating surface of the flange, and R=Rb+T·tan θ and A=πR2 are established, F/A is lower than yield strength of each of a flange material and a multi-hole washer material, and F/a is equal to or higher than predetermined surface pressure determined based on pressure of fluid inside the casing.

First claim

The invention claimed is:

1. A fluid device comprising a casing into which a fluid is introduced, the casing including half bodies, wherein
flanges provided on the respective half bodies are fastened together with use of a plurality of fastening members and a washer shared by two or more adjacent fastening members out of the plurality of fastening members, and
when F is fastening force by each of the fastening members, T is a thickness of the washer, θ is a distribution angle of the fastening force distributed to the flanges from a fastening end part that is an end part of each of the fastening members disposed on the washer, through the washer, Rb is a radius of the fastening end part, R is a radius of a distribution range of the fastening force on a bearing surface of the flange supporting the washer, A is an area of the distribution range of the fastening force on the bearing surface, a is an area of a distribution range of the fastening force on a mating surface of each of the flanges, and R=Rb+T·tan θ and A=πR 2 are established, F/A is lower than yield strength of a material for the flanges and yield strength of a material for the washer, and F/a is equal to or higher than predetermined surface pressure that is determined based on pressure of the fluid inside the casing during operation.

2. The fluid device according to claim 1 , wherein the area a of the distribution range of the fastening force on the mating surface of each of the flanges corresponds to a lateral cross-sectional area of the washer.

3. The fluid device according to claim 2 , wherein at least a part of the plurality of fastening members is a stud bolt including screws on respective ends.

4. The fluid device according to claim 3 , wherein the casing contains a compression mechanism compressing the fluid.

5. The fluid device according to claim 2 , wherein at least a part of the plurality of fastening members is a through bolt that penetrates through both of the abutted flanges.

6. The fluid device according to claim 5 , wherein
the washer is disposed on each of one end side and another end side of the through bolt, and
the through bolt, the washer, and the flanges fastened by the through bolt are disposed line-symmetrically with respect to the mating surfaces.

7. The fluid device according to claim 6 , wherein the casing contains a compression mechanism compressing the fluid.

8. The fluid device according to claim 5 , wherein the casing contains a compression mechanism compressing the fluid.

9. The fluid device according to claim 2 , wherein the casing contains a compression mechanism compressing the fluid.

10. The fluid device according to claim 1 , wherein at least a part of the plurality of fastening members is a stud bolt including screws on respective ends.

11. The fluid device according to claim 10 , wherein the casing contains a compression mechanism compressing the fluid.

12. The fluid device according to claim 1 , wherein at least a part of the plurality of fastening members is a through bolt that penetrates through both of the abutted flanges.

13. The fluid device according to claim 12 , wherein
the washer is disposed on each of one end side and another end side of the through bolt, and
the through bolt, the washer, and the flanges fastened by the through bolt are disposed line-symmetrically with respect to the mating surfaces.

14. The fluid device according to claim 13 , wherein the casing contains a compression mechanism compressing the fluid.

15. The fluid device according to claim 12 , wherein the casing contains a compression mechanism compressing the fluid.

16. The fluid device according to claim 1 , wherein the casing contains a compression mechanism compressing the fluid.

17. The fluid device according to claim 16 , wherein a discharge volute through which the compressed fluid passes toward a discharge port of the fluid device is provided to expand toward an inside of the casing in an axis direction.

Assignees

• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Mizunoue Toshio
• Yoko Kazutoshi
• Yanagisawa Eiichi
• Yanagisawa Shin

Classifications

• F04D17/122 Primary

  the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors · CPC title

• F01D25/243 Primary

  Flange connections; Bolting arrangements (F01D25/265 takes precedence) · CPC title

• F04D29/4206

  especially adapted for elastic fluid pumps · CPC title

• F04D29/624

  especially adapted for elastic fluid pumps · CPC title

• F16B31/028

  with a load-indicating washer or washer assembly · CPC title