CN2480650Y

CN2480650Y - Valve executor

Info

Publication number: CN2480650Y
Application number: CN 01224863
Authority: CN
Inventors: 贺庭海
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-29
Filing date: 2001-05-29
Publication date: 2002-03-06
Anticipated expiration: 2011-05-29

Abstract

The utility model refers to a valve performer which controls an opening or a closing of a fire damper, a smoke discharging fire damper, and a smoke exhausting valve, solving the problems of the present valve performer that ratchet and pawl is slippage, rusted and invalided, the instant working current is big, the spring is fatigued and yielding, and the reliability is poor and the service life is short. The valve performer is started by a restoring force which is produced by a roll-up spring. And when the valve performer is resetting, a static torque which is produced by the locked rotor on the resetting motor and a restoring force of the roll-up spring are in balance. And because an outer temperature sensor is equipped, the maintenance and changing is convenient.

Description

Valve actuator

The utility model belongs to building ventilation fire-protection equipment field, particularly relates to a kind of valve actuator that is used to open fire-closing valve, exhaust smoke valve and smoke evacuation fire-closing valve.

In the fire prevention and smoke extraction system of underground and volumed space building, building or factory building, need in engineering, add fire-closing valve, exhaust smoke valve and smoke evacuation fire-closing valve.Their opening and closing need be handled by valve actuator.Existing valve actuator is made up of electromagnet, extension spring, ratchet and pawl.This valve actuator adopts the mode of hand reset, and the click twist also tightens Returnning spring, makes valve reset.During breaking out of fire, click is broken off relations in the electromagnet action, and the restoring force of Returnning spring makes valve event.There is very big problem in this valve actuator: click skids easily or corrodes inefficacy; When click broke off relations, the operating current of electromagnet moment is excessive, and was unfavorable to central control system; The restoring force of extension spring is big to the impact of valve; The tired easily surrender of extension spring, poor reliability, life-span weak point; When on fire, ifs circuit burns or takes place other fault, then electromagnet akinesia, and valve actuator can not be realized due function, does not reach the purpose of fire prevention and smoke evacuation.

The purpose of this utility model provides a kind of new valve actuator, and it has eliminated the impact of the restoring force of extension spring to valve, and reliability is higher, resets conveniently.

Technological scheme is as follows: a kind of valve actuator, comprise casing and the actuating mechanism of fixedlying connected with casing, positioning means and output shaft, the outer end of output shaft passes casing, and connect the output shaft pusher dog on it, it is characterized in that this valve actuator is provided with the external temp sensor, positioning means comprises the motor that resets, control circuit board, gear reduction transmission device and position limited gear, the axle head of motor of resetting is fixed with motor shaft pinion, position limited gear is fixed on the output shaft, the gear reduction transmission device comprises several transmission shafts, an one transmission gearwheel and a driving pinion are all arranged on the every transmission shaft, driving pinion on the last transmission shaft and the engagement of the transmission gearwheel on next transmission shaft, transmission gearwheel engagement on motor shaft pinion and first transmission shaft, driving pinion on the most last transmission shaft and position limited gear engagement, actuating mechanism is a wind spring, its the inner is fixed on the transmission shaft, its outer end also is fixed, when valve actuator is resetted, motor output torque resets, thereby wind spring is tightened up, keep restoring force on the wind spring, the motor that resets is connected with control wiring on the control circuit board, and by its control, circuit on the control circuit board is the constand current control circuit, control circuit board is connected with power supply by power line, be connected with the external temp sensor by transducer wire, there is starting state limited post and the reset mode limited post that is fixed on the casing both sides of position limited gear, position limited gear is limited in the 90 degree scopes rotates, also be connected with stop collar on the output shaft, stop collar is provided with briquetting, with briquetting first sensitive switch and second sensitive switch are arranged at grade, valve actuator is when reset mode, briquetting can press second sensitive switch, during starting state, briquetting presses first sensitive switch, when resetting, motor rotation blockage, the quiet moment of torsion of stall and wind spring restoring force balance reset.

Described external temp sensor is 70 ℃ of temperature transducers, and a thermistor component is arranged on it, and when external temperature reached 70 ℃, the fusing of thermistor wire made the down circuitry on the control circuit board.On described external 70 ℃ of temperature transducers a hand switch is arranged.Described external temp sensor is 280 ℃ of temperature transducers, and when external temperature reached 280 ℃, this temperature transducer made the down circuitry on the control circuit board.Have four transmission shafts on the described gear reduction transmission device, wind spring the inner is fixed on the 3rd transmission shaft.The radian of described position limited gear is 0.5 π, and a restraining groove is respectively arranged on the limit, and the shape and the limited post of restraining groove are corresponding.Fix a coil spring box on the described casing, wind spring is covered on the inside, the wind spring outer end is fixed on the coil spring box.

Advantage of the present utility model is as follows: adopt electronic control mode, overcome the click orientation type and be easy to the problem of skidding and corroding and losing efficacy, the reliability of body and life-span are increased substantially; Saved electromagnet, eliminated the influence of instantaneous large-current central control system; The answer reliable in action of built-in wind spring, accurate, the life-span of valve actuator is long, is difficult for getting rusty; Saved the trouble that extension spring is installed, corrected valve event and impacted excessive shortcoming, control torque can improve nearly 12 times.The utility model also is provided with the manual activity device, and promptly the hand switch on 70 ℃ of external temp sensors makes more convenient operation.Be applicable to the automatic control of various fire-closing valves, smoke evacuation fire-closing valve and exhaust smoke valve.

Below in conjunction with accompanying drawing embodiment of the present utility model is done description in more detail:

Fig. 1 is the structural representation of the utility model reset mode;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the mesh schematic representation of the gearwheel on the motor shaft pinion and first transmission shaft;

Fig. 4 is the structural representation of the utility model pusher dog;

Fig. 5 is the structural representation of the external 70 ℃ of temperature transducers of the utility model;

Fig. 6 is the structural representation of the external 280 ℃ of temperature transducers of the utility model.

As depicted in figs. 1 and 2, valve actuator comprises casing and the output shaft, two that is fixedly connected on the casing presses sensitive switch, actuating mechanism, electronic control positioning means and external temp sensor.Divide two spaces up and down in the casing, the centre separates with dividing plate.Upper cover plate, dividing plate, side plate and base plate connect into casing with screw or bolt.As shown in Figure 4, output shaft 12 runs through casing, stretches out the outer output shaft end of casing and connects output shaft pusher dog 20.In the working procedure, this pusher dog is stirred fire-closing valve, smoke evacuation fire-closing valve and exhaust smoke valve, makes its action.Casing has two electric wires outward, power line 21 and the transducer wire 19 that is connected external temp sensor and control circuit board 2.Electronically controlled positioning means comprises the motor 4 that resets, has the control circuit board 2 of control circuit, gear reduction transmission device, columned reset mode limited post 26 and starting state limited post 25.Gear reduction transmission device, reset mode limited post and starting state limited post are in the lower floor of casing.Reset motor 4 on the upper strata, be installed on the dividing plate.The gear reduction transmission device comprises gearwheel 8 and the small gear on gearwheel 1 on gearwheel 3 on first transmission shaft and the small gear on first transmission shaft, the gearwheel 9 on second transmission shaft and small gear, the 3rd transmission shaft and small gear, the 4th transmission shaft.Have four transmission shafts, a gearwheel and a small gear are arranged on each root transmission shaft, small gear on the last transmission shaft and the engagement of the gearwheel on next transmission shaft.As shown in Figure 3, have motor shaft to reach lower floor on the motor that resets, axle head connects motor shaft pinion 14, and it meshes with gearwheel 3 on first transmission shaft.Be connected with position limited gear 11 on the output shaft, this gear is fan-shaped, and radian is 0.5 π, it with the most last transmission shaft on pinion.Starting state limited post 25 and reset mode limited post 26 are positioned at the both sides of output shaft tooth sector, the line of centres of two limited posts is by the axle center of output shaft, two limited posts are limited in output shaft in the 90 degree scopes and rotate, an arc restraining groove is respectively arranged on the both sides of position limited gear, and the shape of its shape and limited post is corresponding.Circuit on the control circuit board 2 is the constand current control circuit, is made up of electronic components such as motor control chip, voltage signal comparable chip, relay and triggers.As shown in Figure 5 and Figure 6, control circuit board is connected with external 70 ℃ of temperature transducers 17 or 280 ℃ of temperature transducers 18 by transducer wire 19, and control circuit board 2 connects power supply by power line 21.One manual switch 15 is arranged on 70 ℃ of external temp sensors.Actuating mechanism comprises wind spring 3 and the coil spring box 10 that covers on the wind spring, coil spring box is fixed on the dividing plate, and wind spring places in the coil spring box, and the 3rd transmission shaft 16 of gear reduction transmission device passes coil spring box, the inner of wind spring is fixedly connected on this axle, and the outer end is fixed on the coil spring box.Control circuit board is connected coil spring box by screw and covers.One stop collar 7 is arranged on the output shaft, its with reset motor at the same space, also be in the upper strata, briquetting 24 is arranged on the stop collar.Near output shaft, with stop collar first sensitive switch 5 and second sensitive switch 6 are arranged at grade, these two switches are installed on the dividing plate, and when output shaft rotated, stop collar can press this two sensitive switches respectively.When reset mode, the stop collar briquetting presses second sensitive switch 6, when starting state, presses first sensitive switch 5.Output is connected with display unit with every automatic control as dry type for they.Startup of the present utility model is by the answer moment of torsion on the wind spring, and realize by the reset quiet moment of torsion of motor rotation blockage output and the restoring force balance on the wind spring location.

Working method of the present utility model: valve actuator is installed on fire-closing valve, smoke evacuation fire-closing valve and the exhaust smoke valve, the output shaft pusher dog link to each other with valve and can stir fire-closing valve, discharge fume fire-closing valve and exhaust smoke valve, make its unlatching or close.As shown in Figure 2, when normal state, the quiet moment of torsion of the motor that resets output and the restoring force balance on the wind spring make the valve actuator location, are in reset mode.At this moment, fire-closing valve and smoke evacuation fire-closing valve are in opening state, and exhaust smoke valve is in closed condition.When fire takes place, final controlling element is received central control system, is started from the semaphore request final controlling element of dynamic temperature sense, control circuit makes the motor outage, the quiet moment of torsion that resets on the motor disappears, and the restoring force on the wind spring of rolling-in starts valve actuator, and the output shaft dextrorotation turn 90 degrees, position limited gear stops when turning to starting state limited post 25, briquetting 24 presses the contact 27 on first sensitive switch, and the output shaft pusher dog cuts out fire-closing valve, smoke evacuation fire-closing valve, and opens exhaust smoke valve simultaneously.When needs are opened fire-closing valve, smoke evacuation fire-closing valve and closed exhaust smoke valve simultaneously, can reset to valve actuator.Start the motor that resets, by Pyatyi gear reduction transmission device, wind spring is by rolling-in, and output shaft to back rotation 90 degree, stops when turning to the reset mode limited post counterclockwise, and valve actuator is in reset mode shown in Figure 2 again.At this moment, the output shaft pusher dog is opened fire-closing valve, smoke evacuation fire-closing valve, closes exhaust smoke valve simultaneously.In order to guarantee that enough answer moments of torsion are arranged on the wind spring, can be added with pretightening force on the wind spring.Wind spring also can be connected with first transmission shaft.

Claims

1. valve actuator, comprise casing and the actuating mechanism of fixedlying connected with casing, positioning means and output shaft, the outer end of output shaft passes casing, and connect the output shaft pusher dog on it, it is characterized in that this valve actuator is provided with the external temp sensor, positioning means comprises the motor that resets, control circuit board, gear reduction transmission device and position limited gear, the axle head of motor of resetting is fixed with motor shaft pinion, position limited gear is fixed on the output shaft, the several transmission shafts of gear reduction transmission device, an one transmission gearwheel and a driving pinion are all arranged on the every transmission shaft, driving pinion on the last transmission shaft and the engagement of the transmission gearwheel on next transmission shaft, transmission gearwheel engagement on motor shaft pinion and first transmission shaft, driving pinion on the most last transmission shaft and position limited gear engagement, actuating mechanism is a wind spring, its the inner is fixed on the transmission shaft, the wind spring outer end also is fixed, when valve actuator is resetted, motor output torque resets, thereby wind spring is tightened up, keep restoring force on the wind spring, the motor that resets is connected with control wiring on the control circuit board, and by its control, circuit on the control circuit board is the constand current control circuit, control circuit board is connected with power supply by power line, be connected with the external temp sensor by transducer wire, there is starting state limited post and the reset mode limited post that is fixed on the casing position limited gear both sides, position limited gear is limited in roughly rotates in the 90 degree scopes, also be connected with stop collar on the output shaft, briquetting is arranged on the stop collar, with briquetting first sensitive switch and second sensitive switch are arranged at grade, valve actuator briquetting when reset mode can press second sensitive switch, during starting state, briquetting presses first sensitive switch, when resetting, motor rotation blockage, the quiet moment of torsion of stall and wind spring restoring force balance reset.

2. valve actuator as claimed in claim 1, it is characterized in that described external temp sensor is 70 ℃ of temperature transducers, a thermistor component is arranged on it, and when external temperature reached 70 ℃, the fusing of thermistor wire made the down circuitry on the control circuit board.

3. valve actuator as claimed in claim 2 is characterized in that on described external 70 ℃ of temperature transducers a hand switch being arranged.

4. valve actuator as claimed in claim 1 is characterized in that described external temp sensor is 280 ℃ of temperature transducers, and when external temperature reached 280 ℃, this temperature transducer made the down circuitry on the control circuit board.

5. as claim 1,2,3 or 4 described valve actuators, it is characterized in that have four transmission shafts on the described gear reduction transmission device, wind spring the inner is fixed on the 3rd transmission shaft.

6. valve actuator as claimed in claim 5 is characterized in that the radian of described position limited gear is 0.5 π, and a restraining groove is respectively arranged on the limit, and the shape and the limited post of restraining groove are corresponding.

7. valve actuator as claimed in claim 1 is characterized in that fixing on the casing wind spring cover, and wind spring is covered on the inside, and the wind spring outer end is fixed on the wind spring cover.