Pressure induction type flow switch

Abstract

The invention relates to a pressure induction type flow switch, which is mainly used for detecting micro flow and dropwise leakage. In the adopted technical scheme, a switch body of the switch comprises a working cavity, an induction piston which is in sliding fit is arranged in the cavity, a proximity switch component and a right end cover are fixedly arranged at two ends of the switch body respectively, a left cavity is formed between the proximity switch component and the induction piston, a right cavity is formed between the right end cover and the induction piston, an inlet oil guide hole, an inlet, an outlet and a outlet oil guide hole are further arranged on the switch body, the inlet oil guide hole is connected with the left cavity and the inlet, the outlet oil guide hole is connected with the outlet and the right cavity, a damper is arranged between the working cavity and the outlet, and a spring is arranged between the induction piston and the right end cover. The pressure induction type flow switch can be used for detecting the micro liquid flow and leakage of pipelines in switch control loops of valve remote control systems.

Description

Technical field: [0001] The invention relates to a flow measuring device, in particular to a device for detecting liquid flow in a hydraulic system. Background technique: [0002] In the hydraulic system, there are many occasions where it is necessary to detect whether the liquid in the system is flowing, whether there is leakage, etc., without the need to specifically measure its flow or flow rate, especially in the valve remote control system, in some explosion-proof occasions, it is not allowed to use electronic sensors It is installed on the valve driver to directly measure the running state of the driver. Only indirect methods can be used to judge whether the driver is in motion. It is judged by whether there is liquid flow in the detection system. Usually, a flow switch is used as a detection and judgment device. Existing There are two types of flow switches: [0003] Mechanical flow switch - its characteristic is that the sensing element (such as reed or spool, etc.)...

AI Technical Summary

Problems solved by technology

[0003] Mechanical flow switch - its characteristic is that the sensing element (such as reed or spool, etc.) is inserted into the pipeline of the valve remote control hydraulic system. When the liquid in the pipeline flows, the flowing liquid impacts the sensing element and makes the sensing element Generate a certain amount of displacement, and then touch the electrical component to send a signal; but this kind of flow switch needs enough flow to generate the displacement of the above-mentioned sensing element, and it is difficult to detect small flow, especially droplet flow leakage;

[0004] Electronic flow switch - its characteristic is to use the principle of heat conduction for flow detection, that is, the heat conduction flow switch judges whether the fluid is flowing by detecting whether the heat contacted by the detection element (such as a heating probe) and the measured fluid is taken away by the fluid. Obviously, this structure also requires sufficient flow to be effective, and it cannot detect small flow and drop-shaped flow leakage; similar devices that use ultrasonic principles to detect flow also require a certain value of flow; the prices of the above-mentioned electronic flow switches are all more expensive

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