Butterfly valve detection circuit, butterfly valve detection device and heating and ventilation system

By designing a butterfly valve detection circuit, AC power is converted to DC power using rectification and isolation circuits, and the current is reduced by a current limiting circuit. This solves the problem of inconvenient butterfly valve position determination in HVAC systems and improves accuracy and safety.

CN224550930UActive Publication Date: 2026-07-24SHANGHAI MEICON INTELLIGENT CONSTR CO LTD +1
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Patent Information

Application Number
CN202521831162.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-08-26
Publication Date
2026-07-24
Estimated Expiration
2035-08-26

AI Technical Summary

Technical Problem

In HVAC systems, the refrigerant transmission pipelines are in a closed state, making it difficult to determine the position of the disc plate, which causes inconvenience to operators.

Method used

A butterfly valve detection circuit was designed, including a feedback circuit and a detection branch. The AC power is rectified into DC power using a rectifier circuit and an isolation circuit. The isolation circuit achieves electrical isolation between high voltage and low voltage, reduces the withstand voltage of the low voltage side components to reduce costs, and limits the current through a current limiting circuit to reduce the overall cost and size of the detection circuit.

Benefits of technology

It improves the accuracy and convenience of obtaining the butterfly plate position, reduces the cost and safety risks of the detection circuit, and enhances the safety performance of the detection circuit.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The embodiment of the utility model discloses a butterfly valve detection circuit, a detection device and a heating and ventilation system, the detection circuit comprises a feedback circuit and at least one detection branch, when a butterfly valve is in a fully open position or a fully closed position, the feedback circuit is triggered to output alternating current with first preset voltage; the detection branch comprises a rectification circuit and an isolation circuit, and the rectification circuit is connected with the feedback circuit and is used for accessing alternating current and rectifying the rectification circuit into direct current; the high-voltage side of the isolation circuit is connected with the rectification circuit to access direct current, and the low-voltage side of the isolation circuit is used for outputting detection voltage to isolate the direct current of the high-voltage side from the detection voltage of the low-voltage side, so that the overall safety performance of the detection circuit can be improved, and the cost of low-voltage side components can be reduced; therefore, the overall cost of the detection circuit can be reduced, and the overall safety performance of the detection circuit can be improved. And the position of the butterfly plate can be judged according to the detection voltage, so that the accuracy and convenience of obtaining the position of the butterfly plate are improved.
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