Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is: existing pressure stopper exists that impact force is large, noise is large, the pressure loss seriously and not possesses outside instruction, warning function.
In order to solve the problems of the technologies described above, the present invention adopts following technological scheme:
By a pressure stopper for electromagnetic valve opening and closing, it is characterized in that, comprise housing, piston, cover plate, solenoid valve; Described cover plate is arranged on housing upper opening for closed shell, solenoid valve to be arranged on housing or on cover plate for the switching of hydraulic control oil; Housing is divided into pressure oil cavity, goes out oil pocket, oil back chamber, control oil pocket by described Piston assembling in housing, the housing controlling oil pocket and oil back chamber is equipped with control port and buffering hydraulic fluid port, the control port controlled on oil pocket housing is positioned at above buffering hydraulic fluid port, control port on oil back chamber housing is positioned at below buffering hydraulic fluid port, be equipped with throttle orifice in described control port and buffering hydraulic fluid port, the throttle orifice latus rectum in control port is greater than the throttle orifice latus rectum in buffering hydraulic fluid port.
As a further improvement on the present invention, described piston is provided with a push rod, the top of this push rod is through cover plate.
The underpart of described push rod is spherical structure, and is fixed on piston by flange.
Described cover plate is also equipped with visual indicative mark, directly observes the on off state of pressure stopper at the scene by this visual indicative mark.
As a further improvement on the present invention, described cover plate is provided with the proximity switch of monitoring piston position, sends feedback signal like this after piston action, effectively can guarantee that the action of pressure stopper is accurate.
As a further improvement on the present invention, described piston is differential piston, all has balancing slit in the side, upper and lower of this differential piston, during to ensure piston movement and the concentricity of housing, reduces friction and wear, makes piston action flexible.
Be a conical surface in described differential piston lower tip, and after the taper-face contact in housing, be a linear sealing form.
As a further improvement on the present invention, described solenoid valve is provided with the proximity switch of monitoring valve core of the electromagnetic valve position, sends feedback signal like this after solenoid valve action, effectively can guarantee that the action of pressure stopper is accurate.
Described solenoid valve is the solenoid valve of Single electromagnet or the solenoid valve for double electromagnet.
Working principle of the present invention is: opening direction: control port is located at cover plate bottom, and buffering hydraulic fluid port is located on the spacing seam neutral position of cover plate.When piston is opened, the oil of upper piston area can be discharged by two hydraulic fluid ports simultaneously, and the opening speed of piston is adjusted by the throttle orifice size in control port; When piston is close to fully open position, control port is closed by piston, the oil of upper piston area can only be discharged by buffering hydraulic fluid port, damping throttle orifice is less, therefore the opening speed of piston can reduce greatly, to prevent the too fast impact to cover plate of opening speed, the effect of buffering regulates by the size adjusting damping throttle orifice.Closing direction: buffering hydraulic fluid port is bottom oil back chamber, and control port is on top; Operating principle is identical with opening direction with adjustment mode.
Compared with prior art, the present invention has following beneficial effect:
One, because mounting type is variable, the needs of multiple installation, Placement can be adapted to; Because structure is simple, the series product that piston and the internal diameter of housing just can be designed to different latus rectum only need be changed.
Two, because lining and piston unite two into one, overall dimensions is compared cartridge valve and can be greatly reduced, and has saved material, processing charges, decreases Whole Equipment weight and required installing space.
Four, owing to have employed classification Cushioning Design, the stable action of whole device is adjustable, without impact, noise free, reduces the possibility of impacting the seal failure caused, the working life of extension device.
Five, owing to eliminating closedown spring, when opening, less by the pressure loss of valve group.
Six, Controlling solenoid valve is with position switch; proximity switch is equipped with on device top; switching signal can be put into the opening of turbine-generator units, shut down in flow process; guarantee to cause fault because the action of pressure stopper is not in place in start process; also ensure to shut down reliably blocking of rear pressure oil, ensure the safety of unit.
Seven, device top now indicates with open and close, when overhauling unit, now can confirm the state of pressure stopper, and can take measures to ensure that pressure stopper is at closed positions.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
By a pressure stopper for electromagnetic valve opening and closing, comprise housing, piston, cover plate, solenoid valve; Described cover plate is arranged on housing upper opening for closed shell, solenoid valve to be arranged on housing or on cover plate for the switching of hydraulic control oil; Housing is divided into pressure oil cavity, goes out oil pocket, oil back chamber, control oil pocket by described Piston assembling in housing, the housing controlling oil pocket and oil back chamber is equipped with control port and buffering hydraulic fluid port, the control port controlled on oil pocket housing is positioned at above buffering hydraulic fluid port, control port on oil back chamber housing is positioned at below buffering hydraulic fluid port, be equipped with throttle orifice in described control port and buffering hydraulic fluid port, the throttle orifice latus rectum in control port is greater than the throttle orifice latus rectum in buffering hydraulic fluid port.Pressure oil enters control chamber, and because piston is differential piston, control chamber sectional area is greater than the sectional area of pressure oil cavity, and piston moves downward, and realizes the closedown of pressure stopper; When oil back chamber leads to oil return, piston is opened under the effect of back oil cavity pressure and pressure oil cavity.
Described housing bottom connects pressure oil tank, and side is fuel-displaced.In order to satisfied dullness, two tune and be multiple oil circuit fuel feeding such as overspeed limiting and emergency distributing valve, multiple oil outlet can be established in side.Bottom by Flange joint, also can be designed to board-like Placement, to meet the needs of multiple installation, Placement.
Differential piston lower tip is a conical surface, and after the taper-face contact in housing is a linear sealing form, effectively can ensure the reliability sealed like this.After there are possible wearing and tearing in piston, housing, can auto modification and still ensure to be a linear sealing form, so increase the working life of equipment.