CN-224229750-U - Air extractor structure with bypass air distribution

CN224229750UCN 224229750 UCN224229750 UCN 224229750UCN-224229750-U

Abstract

The utility model relates to an air extractor structure with bypass steam distribution, which comprises a working steam inlet pipe, a throttle orifice plate, a steam inlet distribution body, an angle valve, a bypass steam distribution pipe and an ejector, wherein two ends of the throttle orifice plate of the working steam inlet pipe are connected with a bypass steam distribution pipeline in parallel, and the angle valve for controlling the flow of bypass steam is arranged in the bypass steam distribution pipeline. By additionally arranging the bypass steam distribution mechanism on the steam inlet structure of the air extractor, the air extractor can still reliably operate when the working steam parameter is reduced from a high parameter, and even under a low parameter working condition, the equivalent or better vacuum degree can be realized, so that the requirements of a marine two-loop system on the pumping capacity of a condenser and a shaft seal under a starting working condition and a lower working condition are met.

Inventors

ZHANG CHENGHONG
ZHANG KUNYU
ZHANG XUYANG
GAO YIQIU

Assignees

中国船舶集团有限公司第七〇四研究所

Dates

Publication Date: 20260512
Application Date: 20250523

Claims (7)

1. The air extractor structure with the bypass steam distribution is characterized by comprising a working steam inlet pipe, a throttle orifice plate, a steam inlet distribution body, an angle valve, a bypass steam distribution pipe and an ejector, wherein two ends of the throttle orifice plate of the working steam inlet pipe are connected with a bypass steam distribution pipeline in parallel, and the angle valve for controlling the flow of the bypass steam is arranged in the bypass steam distribution pipeline.
2. The ejector structure with bypass steam distribution according to claim 1, wherein the working steam inlet pipe is connected with the ejector through the steam inlet distribution body, and the bypass steam distribution pipe is directly communicated with the steam main pipe of the steam inlet distribution body.
3. The structure of claim 1, wherein the angle valve is an electric angle valve, and the opening of the angle valve is adjusted by the controller in real time according to steam parameters.
4. The by-pass steam distribution ejector structure according to claim 1, wherein the aperture of the throttle orifice plate is 30% -50% of the inner diameter of the working steam inlet pipe, and is positioned near the inlet end of the steam inlet distribution body.
5. The ejector structure with bypass steam distribution according to claim 1, wherein the ejector consists of a first-stage ejector and a second-stage ejector, and the first-stage ejector and the second-stage ejector share the same steam inlet distribution body.
6. The ejector structure with bypass steam distribution according to claim 1, wherein the pipe diameter of the bypass steam distribution pipe is 1.2-1.5 times of that of the working steam inlet pipe.
7. The structure of the air extractor with bypass air distribution device according to claim 1, wherein the air inlet air distribution body is connected with the ejector in a sealing way by a flange, and a graphite winding gasket is arranged on the flange surface.

Description

Air extractor structure with bypass air distribution Technical Field The utility model relates to the field of ship secondary circuits and turbines, in particular to an air extractor structure capable of realizing wide-working-condition operation through a bypass steam distribution mechanism, which is particularly suitable for a marine system with frequent steam parameter fluctuation. Background The conventional air extractor adopts the design of high parameters of working steam under rated working conditions, and is mainly operated under high parameters after being selected, and when the working steam parameters change, the air extractor deviates from the design working conditions and even cannot work normally. In the prior art, for example, CN119196648a discloses a vapor absorption and regasification device, while a circulation system is optimized through a bypass pipe, the core is vapor compression and regasification, and the problem of flow self-adaption of an air extractor under a low-parameter working condition is not solved. Therefore, there is a need for an ejector that can accommodate a wide range of steam parameters, is simple in structure, and is highly reliable. Disclosure of Invention The utility model provides a novel air extractor structure with bypass steam distribution, which can reliably operate when working steam parameters are reduced from high parameters by additionally arranging a bypass steam distribution mechanism on an air extractor steam inlet structure, and can realize equivalent or better vacuum degree even under low-parameter working conditions, thereby meeting the requirements of a marine two-loop system on the suction capacity of a condenser and a shaft seal under starting working conditions and lower working conditions. In order to achieve the purpose, the technical scheme is that the air extractor structure with the bypass steam distribution comprises a working steam inlet pipe, a throttle plate, a steam inlet distribution body, an angle valve, a bypass steam distribution pipe and an ejector, wherein two ends of the throttle plate of the working steam inlet pipe are connected with a bypass steam distribution pipeline in parallel, and the angle valve for controlling the flow of bypass steam is arranged in the bypass steam distribution pipeline. Further, the working steam inlet pipe is connected with the ejector through the steam inlet distribution body, and the bypass steam distribution pipe is directly communicated to the steam main pipe of the steam inlet distribution body. Further, the angle valve is an electric angle valve, and the opening of the angle valve is adjusted in real time by a controller according to steam parameters. Further, the aperture of the orifice plate is 30% -50% of the inner diameter of the working steam inlet pipe, and the orifice plate is positioned close to the inlet end of the steam inlet distribution body. Further, the ejector consists of a first-stage ejector and a second-stage ejector, and the first-stage ejector and the second-stage ejector share the same inlet gas distribution body. Further, the pipe diameter of the bypass steam distribution pipe is 1.2-1.5 times of that of the working steam inlet pipe. Further, the steam inlet distribution body is in sealing connection with the ejector through a flange, and a graphite winding gasket is arranged on the flange surface. The beneficial effects of the utility model are as follows: The utility model adopts the bypass steam distribution structure, and under the high-parameter working condition, the working steam flow of the original inlet pipeline is unchanged, and the air extractor works normally. And when the working condition is low, the bypass pipeline angle valve is opened, so that working steam bypasses the throttle plate and directly enters the ejector, the main pipe runner is far larger than a pipeline originally provided with the throttle plate, and the steam flow is greatly increased. When the air extractor is in a low-parameter working condition, more working steam can enter, so that the air extractor has enough suction capacity when in low-parameter working condition, and the required vacuum degree is realized and reached. The capacity of sucking air in the condenser and keeping micro negative pressure of the steam seal air suction system of the steam turbine under the starting working condition and the lower working condition of the marine two-loop system is effectively solved, and therefore normal operation of each steam turbine device of the two-loop system is ensured. Drawings FIG. 1 is a schematic plan view of an ejector structure with bypass bleed; FIG. 2 is a schematic perspective view of an ejector structure with bypass steam distribution; FIG. 3 is a schematic diagram of the structural system of the air extractor with bypass air distribution; in the figure, a working steam inlet pipe, a throttle orifice plate, a steam inlet distributor, an angle valve, a bypass steam distributi