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lvdt feedback lever bracket

A feedback rod and door rod technology, applied in the field of brackets and LVDT feedback rod brackets, can solve the problems of LVDT feedback rod deformation and coil damage, and achieve the effect of unobstructed up and down displacement, reduced friction, and ingenious overall design.

Active Publication Date: 2019-07-19
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the operation of the generator set, the adjustable door is continuously opened or closed with the change of the load, so that the spring of the door body will generate a torsional moment, which is transmitted to the door lever to cause a certain twist of the door lever, which in turn leads to a rigid connection with it. The LVDT feedback rod deflects to different degrees, resulting in friction between the LVDT feedback rod and the LVDT sleeve. Long-term back and forth friction will inevitably lead to coil damage in the LVDT sleeve or deformation of the LVDT feedback rod.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: see figure 1 , a LVDT feedback rod bracket, the feedback rod bracket includes a gasoline engine small shaft 2, a gate lever 1, a transition rod 12, an LVDT feedback rod 10, a fixed plate 3, an LVDT sleeve 5, and a cylinder positioning sleeve 6, the The adjusting door rod 1 is rigidly connected to the transition rod 12, the fixed plate 3 is rigidly connected to the small shaft 2 of the steam turbine, the LVDT sleeve 5 is rigidly connected to the fixed plate 3, and the LVDT feedback rod 10 is arranged on the cylindrical positioning sleeve 6 Inside, the transition rod 12 is arranged between the door lever 1 and the LVDT feedback rod 10, the transition rod 12 is fixedly connected with the LVDT feedback rod 10 through a locking screw, and the LVDT sleeve 5 is arranged on the cylinder positioning sleeve 6 below. This technical solution can overcome the unfavorable factors of the vibration and offset force of the door lever on the feedback lever, and largely eli...

Embodiment 2

[0028] Example 2: see figure 1 , figure 2 , as an improvement of the present invention, the feedback rod bracket includes an in-line positioning rod 9, the in-line positioning rod 9 is symmetrically arranged on both sides of the LVDT feedback rod 10, and is rigidly connected with the LVDT feedback rod 10 . In this technical solution, the inline positioning rod 9 is used to fix the feedback rod 10, and at the same time, the fixing space of the cylindrical positioning sleeve is used to make the working components of the LVDT feedback rod in the LVDT sleeve under the action of the positioning rod, only It can move up and down, but the lateral displacement of left and right or front and rear is limited, which avoids the influence of the offset force and vibration of the door lever on the working components of the feedback lever below the positioning lever, eliminates the downward movement of the offset force, and ensures feedback Rod working components will not bend, deformatio...

Embodiment 3

[0029] Embodiment 3: see figure 1 , figure 2, as an improvement of the present invention, the cylindrical positioning sleeve is symmetrically provided with positioning notches 15, and the inline positioning rod 9 is arranged in the positioning notches 15; Set the locking screws 13 symmetrically. Utilize the locking function of the locking screw 13 to lock and position the LVDT feedback lever, keep the feedback signal sent to the control system, and facilitate door adjustment, maintenance and debugging. The rest of the structures and advantages are exactly the same as in Embodiment 1.

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Abstract

The invention relates to a novel LVDT feedback rod support. The feedback rod support comprises a gasoline engine small shaft, a control valve rod, a transition rod, an LVDT feedback rod, a fixation plate, an LVDT sleeve and a cylinder positioning sleeve, wherein the control valve rod is in rigid connection with the transition rod, the fixation plate is in rigid connection with the gasoline engine small shaft, the LVDT sleeve is in rigid connection with the fixation plate, the LVDT feedback rod is arranged in the cylinder positioning sleeve, the transition rod is arranged between the control valve rod and the LVDT feedback rod, the transition rod is fixedly connected with the LVDT feedback rod through a locking screw, and the LVDT sleeve is arranged below the cylinder positioning sleeve. According to the technical scheme, unfavorable factors exerted on the feedback rod by vibration and deflection forces of the control valve rod can be overcome, the fault phenomenon that a coil is worn out when a work part of the feedback rod is bent and deformed in the LVDT sleeve due to downward shift of the deflection forces is eliminated to a quite large degree, and normal work of a displacement sensor LVDT can be fully guaranteed.

Description

technical field [0001] The invention relates to a bracket, in particular to an LVDT feedback rod bracket, which belongs to the technical field of electric instrument detection and machinery. Background technique [0002] Differential transformer, hereinafter referred to as LVDT, is widely used as a precise displacement sensor in the position feedback of steam turbine in thermal power plants. LVDT sends the position signal of the valve to the electro-hydraulic servo control system in real time, so as to realize the purpose of controlling the opening of the steam turbine valve. The LVDT feedback rod is equivalent to the moving iron core. The primary coil and the two secondary coils are integrated and armored in the LVDT sleeve. During field installation, the LVDT sleeve is welded to the steam turbine body through the fixing bracket, and the LVDT feedback rod is mechanically connected. The lever is connected with the door lever. When the door is opened or closed, the door lever...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D11/30
Inventor 成涛
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD