Low-temperature air cylinder working chamber component structure of liquefied natural gas vapor compressor

A technology of liquefied natural gas and component structure, which is applied in the field of compressors, can solve problems such as poor casting performance, and achieve the effects of simple casting, good sealing and movement performance, and energy saving

Active Publication Date: 2015-07-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the castability of the material is poor

Method used

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  • Low-temperature air cylinder working chamber component structure of liquefied natural gas vapor compressor
  • Low-temperature air cylinder working chamber component structure of liquefied natural gas vapor compressor
  • Low-temperature air cylinder working chamber component structure of liquefied natural gas vapor compressor

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Experimental program
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Effect test

Embodiment 1

[0028] figure 2 Shown is an integrated cast cylinder structure. The cylinder block 1-1, intake valve chamber 1-2 and exhaust valve chamber 1-3 are cast in one piece. The upper part of the cylinder is the intake valve chamber and the lower part is the exhaust valve chamber. There are 8 in total. The two valve chambers share one inlet and exhaust passage, one side of the crankshaft is closed, the other end is half open for casting, and the opening is sealed by end caps 1-4. The front-end valve chamber is milled out of a plane after the casting is completed, and a screw hole is opened on the plane, and the end cover 1-4 is fastened with bolts. The intake valve chamber 1-2 and the exhaust valve chamber 1-3 are provided with flanges that can be connected with flanges, and the flanges are respectively connected to the flanges of the intake air collecting pipe 1-5 and the exhaust collecting air pipe 1-6 through bolts. Connected. The intake collecting air pipes 1-5 and the exhaust c...

Embodiment 2

[0030] Such as image 3 As shown, the difference from Embodiment 1 is that the cylinder block 1-1, the intake valve chamber 1-2 and the exhaust valve chamber 1-3 of this embodiment are manufactured separately and connected by welding. The cylinder block 1-1 is only a cylindrical cavity, and the intake valve chamber 1-2 and the exhaust valve chamber 1-3 are respectively formed by welding several steel plates. The shape of the assembled valve housing is a rectangular parallelepiped with cylindrical valve holes. The rest of the arrangement is similar to the first embodiment, one side of the crankshaft is closed, the other end is half open for casting, and the opening is sealed by the end caps 1-4. Since the outer walls of the intake valve chamber 1-2 and the exhaust valve chamber 1-3 are flat, several threads can be directly opened on the outer walls of the cylinder block 1-1, intake valve chamber 1-2 and exhaust valve chamber 1-3 Holes are connected with end caps 1-4 by bolts. ...

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Abstract

The invention discloses a low-temperature air cylinder working chamber component structure of a liquefied natural gas vapor compressor. The low-temperature air cylinder working chamber component structure of the liquefied natural gas vapor compressor comprises an air cylinder, a piston and a piston rod. A cylinder body of the air cylinder is of a single-wall cylinder type with two open ends, two air inflow valve cages located at the two ends of the cylinder body are arranged at the upper end of the cylinder body, and two air release valve cages located at the two ends of the cylinder body are arranged at the lower end of the cylinder body. According to the low-temperature air cylinder working chamber component structure of the liquefied natural gas vapor compressor, the air cylinder is of a single wall structure, the structure is simple, and casting is facilitated. The valve cages can be cast and formed together with the air cylinder body, and the valve cages can also be welded to the air cylinder by combining plurality of steel plates in a welding method. Due to the fact that the air cylinder body only has the single wall, heat conducted to an upper air suction part through an exhaust part with high temperature during operating can be reduced, inflowing air is effectively prevented from being heated, and more energy is saved in the compressing process. The outward ends of the air inflow valve cages and the outward ends of the air outflow valve cages are open, a plurality of fastening screw holes are formed, an air cylinder cover also serves as outer walls of the valve cages, bolts are used for fastening, and casting difficulty can be further lowered.

Description

Technical field [0001] The invention belongs to the technical field of compressors, and specifically relates to a low-temperature cylinder working chamber assembly structure of a liquefied natural gas vaporized gas compressor. Background technique [0002] Liquefied natural gas boil-off gas (BOG) compressor is used to compress boil-off gas generated during the storage and transportation of liquefied natural gas, and its first-stage cylinder needs to withstand a low temperature of -160℃. At present, there are mainly two types of cylinders on the market: one is the vertical labyrinth seal structure produced by Sulzer-Buckhard, Switzerland, and the material is made of GGG Ni35 ductile iron. The other is a horizontal counter-acting compressor produced by IHI Corporation, Japan, which uses non-metallic piston ring seals. Materials such as cylinder and piston are stainless steel. [0003] 20Mn32AL is a low temperature steel developed by our country, which can meet the low temperature r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B37/12F04B39/12F04B39/00F04B39/10
Inventor 李云郁永章燕翌
Owner XI AN JIAOTONG UNIV
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