Multistage pressure-reducing throttle orifice plate

Abstract

The invention discloses a multistage pressure-reducing throttle orifice plate. The multistage pressure-reducing throttle orifice plate comprises two half shell bodies, wherein the two half shell bodies are connected by flange plates to form a shell, a sleeve is mounted on the inner circumferential wall of the shell, a secondary orifice plate is arranged at the middle part of the sleeve, multiple primary orifice plates are uniformly distributed on the inner wall of the sleeve by utilizing the secondary orifice plate as a symmetry axis, the end parts of the two ends of the secondary orifice plate extend to intervals inbetween the two flange plates after respectively penetrating through the sleeve, and sealing gaskets are arranged on the two side walls of extension sections of the secondary orifice plate. The secondary orifice plate faces to connection end faces of the two half shell bodies, and the two extension sections of the secondary orifice plate are respectively arranged between the two flange plates; and meanwhile, the sealing gaskets are paved on the two side walls of the extension sections, and the two half shell bodies are fastened together by bolts, so that the opposite end faces of the two flange plates are directly tightly pressed on the sealing gaskets to complete sealing between the sleeve and the shell.

Description

technical field [0001] The invention relates to the field of flow sensors, in particular to a multi-stage pressure-reducing orifice plate. Background technique [0002] When the fluid flows through the throttling device in the pipeline, the stream will form a local contraction at the throttling part of the throttling device, so that the flow rate increases and the static pressure is low, so a pressure drop occurs before and after the throttling part, that is, the pressure The greater the flow rate of the medium flow, the greater the pressure difference before and after the throttling member, so the fluid flow can be measured by measuring the pressure difference. However, the pressure at the constriction section of the orifice plate in the existing throttling device drops below the saturated vapor pressure at the corresponding temperature of the liquid, and the steam and the gas dissolved in the water will escape in the stream, forming a mixture of steam and gas. Small bubbl...

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Problems solved by technology

However, the pressure at the constriction section of the orifice plate in the existing throttling device drops below the saturated vapor pressure at the corresponding temperature of the liquid, and the steam and the gas dissolved in the water will escape in the stream, forming a mixture of steam and gas. Small bubbles, the lower the pressure, the more bubbles; when the pressure downstream of the orifice plate is still lower than the saturated vapor pressure of the liquid, the bubbles will continue to be generated in the downstream pipeline, and the liquid-vapor two-phase mixture exists; if the downstream pressure returns to Higher than the saturated vapor pressure of the liquid, the bubbles condense rapidly and burst under the action of high pressure. At the moment of bubble rupture, local cavities are generated, and high-pressure water flows to the space occupied by these original bubbles at a very high speed, forming An impact force; because the gas and steam in the bubbles are too late to dissolve and condense in an instant, they are divided into small bubbles under the action of the impact force, and then compressed and condensed by high-pressure water. Severe cavitation effects greatly reduce its service life; and the replacement process of the orifice plate is relatively complicated, which consumes a lot of manpower and material resources, and increases the cost of the throttling device

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