CN2483886Y

CN2483886Y - Transformation unit for stepping auto centering motor

Info

Publication number: CN2483886Y
Application number: CN 00232482
Authority: CN
Inventors: 林昌杰; 陈育平; 邓显文
Original assignee: SANXIN SELF-CONTROLLING EQUIPENT Co Ltd WUHAN
Current assignee: SANXIN SELF-CONTROLLING EQUIPENT Co Ltd WUHAN
Priority date: 2000-11-24
Filing date: 2000-11-24
Publication date: 2002-03-27
Anticipated expiration: 2010-11-24

Abstract

The utility model is an electric-mechanical displacement conversion device which can accurately convert faint electronic signal into mechanical displacement signal and can automatically revert the intermediate balance position when be in abnormality state, which can be used in the electric-hydraulic governor of the hydroelectric generating set of hydropower stations. The device is driven by a stepping motor to move with the directly connected thread rolling bar, the rotation of the stepping motor is converted into the reciprocation linear movement of the thread bar sleeve. When in the abnormal state of equipment, the valve stem can be accurately reset to the intermediate balance position by the role of oil pressure, which can ensure the safety of equipments and stable operation.

Description

Chinese style motor conversion equipment is answered in stepping automatically

The utility model relates to a kind of stepping that can will the faint signal of telecommunication be converted to mechanical displacement signal exactly and can automatically be returned to the intermediate equilibria position when abnormal conditions and answers Chinese style motor conversion equipment automatically, can be used for important auxiliary equipment---the electrohydraulic governor of hydroelectric station hydraulic generator unit.

Electrical converter is a key element that connects electric part and mechanical-hydraulic part in the modern electrohydraulic governor.Its effect is with the comprehensive electric signal of electric part output, converts the mechanical displacement signal with certain operating physical force and displacement to.Existing power station this type of device commonly used is generally electrohydraulic servo valve.Electrohydraulic servo valve drives the action of one-level spool by the magnet steel interior loop, amplifies through hydraulic pressure to drive the action of two utmost point spools.This device is because coil manipulation power is little, and I and II spool coaxial arrangement, and fit clearance is little, to the required precision height of oil filtration, the difficulty of hair fastener, and manufacturing easily.

The purpose of this utility model provides a kind of stepping and answers Chinese style motor conversion equipment automatically.It can guarantee to convert the electrical signal to accurately and timely mechanical displacement, simultaneously, can guarantee again to make control lever automatically be returned to the intermediate equilibria position when the unit exception situation.Owing to do not use hydraulic oil during operate as normal, just use a spot of hydraulic oil in the time of only in the needs spool is multiple, so package unit reliability height.

The purpose of this utility model is achieved in that

Stepping motor and ball wire bar pair are direct-connected, faint signal of telecommunication input stepping motor, and the torque of stepping motor output is converted into the straight-line displacement of screw pair by ball wire bar pair.The ball screw cover drives multiple middle valve core by shaft coupling.When operate as normal multiple in spool only be subjected to the power output of screw mandrel cover and action resistance influence and be not subjected to the active force of oil pressure and move, when the unit exception situation, valve core is subjected to the effect of oil pressure and promptly is returned to the centre position in multiple, to guarantee the safe and stable operation of unit.

Electricity of the present utility model-mechanical displacement transfer process is finished by pure machine driving, and the ball screw motion is flexible, reliable, frictional resistance is little, and can reciprocal movement.Running part does not have hydraulic part, and is simple in structure, not oil consumption.Mechanism's spool is not subjected to the oil pressure active force at ordinary times in multiple, the work of floating, and oil consumption is extremely low, reliable in action, regulates easy to maintenance.

Fig. 1 is a schematic diagram of the present utility model.

Fig. 2 is example structure figure of the present utility model.

In Fig. 1, stepping motor (1) is direct-connected with ball wire bar pair (2), faint signal of telecommunication input stepping motor, and the torque of stepping motor output is converted into the straight-line displacement of screw pair by ball wire bar pair (2).The ball screw cover passes through cross joint hair style Hooks coupling universal coupling (3) and drives multiple middle valve core (5), and multiple middle valve core (5) has two valve discs up and down.When operate as normal multiple in spool only be subjected to the power output of screw mandrel cover and action resistance influence and be not subjected to the active force of oil pressure and move.When the unit exception situation, multiple in valve core (5) be subjected to the effect of oil pressure and promptly be returned to the centre position, guarantee unit operation safely, stablize unaffected.The helical pitch of ball wire bar pair is 10～20mm, and the impulse stroke of screw mandrel cover is 10～30mm.

In the embodiment shown in Figure 2, the utility model is by stepping motor (1), ball wire bar pair (2), and universal shaft coupling device (3) and valve body (4) and spool (5) are formed.Shown position is that ball screw (2) mediates, and spool (5) is in the equilbrium position.Stepping motor and ball wire bar pair are rigidly connected, a pair of back-to-back rolling bearing bears on the motion axial force of ball screw, the screw mandrel sleeve is connected with spool by the direction shaft joint, with the influence that the axis decentraction of eliminating two movement parts produces, guarantees that valve core movement is flexible.Spool has two valve discs up and down, and when operate as normal, last valve disc is not subjected to axial oil pressure and is in quick condition in both sides up and down.When unit exception, following valve disc is opened the hydraulic fluid port of lower end, makes valve disc generation oil pressure up or down, makes valve rod be returned to the intermediate equilibria position rapidly and exactly, and the below of valve rod also has adjustment screw, can adjust when mounted easily.

Claims

1, a kind of stepping that can will the faint signal of telecommunication be converted to mechanical displacement signal exactly and can automatically be returned to the intermediate equilibria position when unusual condition Chinese style motor conversion equipment again automatically is characterized in that: stepping motor (1) and ball wire bar pair (2) direct connection; Ball wire bar pair is connected with multiple middle spool (5) by Hooks coupling universal coupling (3); Spool (5) has upper and lower two valve discs in multiple.

2, device according to claim 1, the helical pitch that it is characterized in that ball wire bar pair is 10～20mm, the impulse stroke of screw mandrel cover is 10～30mm.

3, device according to claim 1, it is characterized in that ball screw cover with multiple in valve core chamber be connected to cross joint hair style Hooks coupling universal coupling.