Helium compressor capable of being started in anti-surge mode under high back pressure

Abstract

The invention discloses a helium compressor capable of preventing surge starting under high back pressure, which is positioned in a main bag of an airship and comprises a helium compressor main body, an electric control valve and a check valve, the helium compressor main body is communicated with or separated from the main bag of the airship through the electric control valve, and the check valve is communicated with the main bag of the airship through the electric control valve. And the helium compressor main body is communicated with or separated from the overpressure air bag in the airship main bag through the check valve. By additionally arranging the electric control valve and the check valve and controlling the electric control valve and the check valve in good time, the helium compressor can pass through a surge area and enter a normal working state in an extremely short time when started, damage and harm to equipment caused by surge are avoided, and reliable operation and use of the equipment are guaranteed.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a helium compressor capable of anti-surge startup under high back pressure. Background technique [0002] The stratospheric airship is an aircraft that relies on helium to provide static buoyancy for lift-off and stay in the air. The main capsule of the airship is a flexible body filled with helium, which needs to be controlled by pressure difference to keep the pressure difference at a certain level during the entire flight process Within a range, so as to maintain the shape and work safety of the entire main capsule. During the long-term vacant period, affected by radiation factors such as light during the day, the gas inside the main bag will generate severe overheating, resulting in a continuous rise in the temperature and pressure inside the main bag. Part of the helium in the main bag is discharged, and the current control methods are divided into two categories: one i...

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Problems solved by technology

[0004] However, the commonality of bladed fan equipment such as compressors is that when the critical point of the P-Q curve is exceeded and the working condition is entered into the left area, that is, when working in the unstable area, the flow rate and pressure head of the fan will undergo an unstable cycle in an instant. sexual relapse

The maximum pressure head produced by the fan will be smaller than the resistance loss in the pipeline, and the fluid will start to flow backwards in the opposite direction, and flow back into the fan from the pipeline (negative flow occurs). Since the fan continues to run, when the pressure in the pipeline drops, the fan will The output flow is restarted, as long as the flow required by the outside world remains less than the critical point flow, the above process will repeat, that is, surge will occur. This kind of low-frequency and high-amplitude airflow oscillation is a great source of exciting force. It will cause strong mechanical vibration of the compressor components and overheating of the hot end, and cause serious damage to the components in a very short time

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