CN-121993656-A - Non-magnetic control valve position indicating device and method

Abstract

The invention relates to the technical field of valve position indicators. The device comprises a shell, a transmission mechanism, a strain mechanism and a sensing mechanism, wherein the transmission mechanism is arranged in the shell, one end of the transmission mechanism is connected with a valve rod of the valve, the other end of the transmission mechanism is connected with the strain mechanism, and the sensing mechanism is arranged on the strain mechanism. Converting the linear motion of the valve rod into mechanical transmission motion through a transmission mechanism in response to the linear motion of the valve rod; driving the strain mechanism through the transmission mechanism to enable the strain mechanism to generate elastic deformation corresponding to the position of the valve; the deformation of the strain mechanism is detected by the sensing mechanism, an electric signal proportional to the deformation is output, and the opening and closing state and the stroke position of the valve are judged based on the direction and the amplitude of the electric signal. The problem that the traditional magnetic control valve position indicator is poor in reliability and easy to fail under extreme industrial environments such as high temperature, strong radiation and the like is solved.

Inventors

• LIU ZHILONG
• LI MINGGANG
• HUANG YANPING
• ZHENG HUA
• LI TONGXI

Assignees

• 中国核动力研究设计院

Dates

Publication Date

20260508

Application Date

20260213

Claims (10)

1. 1. The non-magnetic control valve position indicating device is characterized by comprising a shell, a transmission mechanism, a strain mechanism and a sensing mechanism, wherein the transmission mechanism is arranged in the shell, one end of the transmission mechanism is connected with a valve rod of a valve, the other end of the transmission mechanism is connected with the strain mechanism, and the sensing mechanism is arranged on the strain mechanism and used for detecting deformation of the strain mechanism caused by movement of the valve rod of the valve and outputting a detection signal corresponding to the position of the valve.
2. 2. The non-magnetically controlled valve position indicating device of claim 1, wherein the strain mechanism comprises a first strain assembly and a second strain assembly symmetrically disposed, and the transmission mechanism is connected to the first strain assembly and the second strain assembly via a first connection assembly and a second connection assembly, respectively.
3. 3. The non-magnetically controlled valve position indicating device of claim 1, further comprising an elastic mechanism comprising a first elastic component and a second elastic component, wherein the first elastic component is coupled between the transmission mechanism and the first strain component, and the second elastic component is coupled between the transmission mechanism and the second strain component.
4. 4. The non-magnetically controlled valve position indicating device of claim 1, wherein the sensing mechanism comprises a first sensing assembly and a second sensing assembly, the first sensing assembly being disposed on the first strain assembly, the second sensing assembly being disposed on the second strain assembly.
5. 5. The non-magnetically controlled valve position indicating device of claim 4, wherein the first sensing assembly and the second sensing assembly are strain sensors, and wherein the direction and magnitude of the output signals of the first sensing assembly and the second sensing assembly collectively characterize the open, closed, and travel positions of the valve.
6. 6. The non-magnetically controlled valve position indicating device of claim 1, wherein the transmission mechanism comprises a first transmission assembly, a second transmission assembly and a third transmission assembly which are sequentially connected, the first transmission assembly is connected with the valve rod of the valve, the third transmission assembly is connected with the strain mechanism, and two ends of the second transmission assembly are respectively connected with the first transmission assembly and the third transmission assembly.
7. 7. The non-magnetically controlled valve position indicating device of claim 6, further comprising a rotating assembly, wherein the second transmission assembly is of an annular rack structure, the rotating assembly comprises at least two fixed pulleys, the second transmission assembly is wound on the fixed pulleys, and the first transmission assembly and the third transmission assembly are both in meshed connection with the second transmission assembly.
8. 8. The non-magnetically controlled valve position indicating device of claim 1, wherein the housing interior cavity is in communication with the valve cavity.
9. 9. The non-magnetically controlled valve position indicating device of claim 1, further comprising a support assembly mounted within said housing, said transmission passing through said support assembly.
10. 10. A non-magnetically controlled valve position indication method based on the non-magnetically controlled valve position indication device according to any one of claims 1-9, comprising the steps of: converting the linear motion of the valve rod into mechanical transmission motion through the transmission mechanism in response to the linear motion of the valve rod; the strain mechanism is driven by the transmission mechanism, so that the strain mechanism generates elastic deformation corresponding to the position of the valve; detecting deformation quantity and deformation direction of the strain mechanism through the sensing mechanism, and outputting an electric signal which is in direct proportion to the deformation quantity, wherein the electric signal direction is consistent with the deformation direction; And judging the opening and closing states and the stroke positions of the valve based on the direction and the amplitude of the electric signals.

Description

Non-magnetic control valve position indicating device and method Technical Field The invention relates to the technical field of valve position indicators, in particular to a non-magnetic control valve position indicating device and method. Background The valve position indicator is a key component in the field of industrial control and is used for monitoring the on-off state of a valve in real time so as to ensure safe and reliable operation of a flow. At present, the traditional valve position indicator mostly adopts a design scheme based on a reed pipe and other magnetic control circuit devices, and the working principle of the traditional valve position indicator depends on magnetic induction characteristics that the reed pipe is closed when a magnetic field is close, and the reed pipe is opened when the magnetic field is far away, so that the valve position is indirectly reflected. However, in extreme industrial environments such as nuclear industry, severe conditions such as high temperature, strong radiation and noise interference often exist, and the magnetic control type indicator is easy to be influenced by the environment because of electronic elements, and after long-term use, the problems of performance degradation, misoperation or complete failure generally occur, so that the reliability and the safety of the system are seriously influenced. To improve the reliability of valve position detection, several improvements have been made in the prior art. For example, a non-contact type valve position feedback device based on a Hall effect is disclosed in a non-contact type detection device, and valve position feedback is realized through magnetic field change, and a linear Hall sensor is adopted in a non-contact type valve position transmitter based on a linear Hall sensor to be matched with a microprocessor system, so that real-time accurate measurement and signal transmission of valve position are realized. Although the scheme can improve the detection precision and response speed under certain conditions, the scheme is still basically dependent on the electronic sensing element and the signal processing circuit, the reliability of the electronic device can not be fundamentally ensured under the extreme working conditions of long-term high temperature, radiation and the like, and the system is complex, has higher cost and is difficult to realize long-term stable operation in a severe industrial environment. Therefore, a valve position indicating device which has a simple structure, strong environmental adaptability and does not depend on magnetic control and electronic elements is urgently needed, so that the working reliability and the service life of the valve position indicating device under severe conditions are fundamentally improved. Disclosure of Invention The invention aims to provide a non-magnetic control valve position indicating device and a non-magnetic control valve position indicating method, and aims to solve the problems that a traditional magnetic control valve position indicator is poor in reliability and easy to fail in extreme industrial environments such as high temperature, strong radiation and the like. The invention is realized by the following technical scheme: The non-magnetic control valve position indicating device comprises a shell, a transmission mechanism, a strain mechanism and a sensing mechanism, wherein the transmission mechanism is arranged in the shell, one end of the transmission mechanism is connected with a valve rod of a valve, the other end of the transmission mechanism is connected with the strain mechanism, and the sensing mechanism is arranged on the strain mechanism and used for detecting deformation of the strain mechanism caused by movement of the valve rod of the valve and outputting a detection signal corresponding to the position of the valve. Optionally, the strain mechanism includes a first strain component and a second strain component that are symmetrically arranged, and the transmission mechanism is respectively connected with the first strain component and the second strain component through a first connection component and a second connection component. Optionally, the device further comprises an elastic mechanism, wherein the elastic mechanism comprises a first elastic component and a second elastic component, the first elastic component is connected between the transmission mechanism and the first strain component, and the second elastic component is connected between the transmission mechanism and the second strain component. Optionally, the sensing mechanism includes a first sensing component and a second sensing component, the first sensing component is disposed on the first strain component, and the second sensing component is disposed on the second strain component. Optionally, the first sensing component and the second sensing component are strain sensors, and the direction and the amplitude of the output signals of the first sens