Servo water pressure control device
Technical field
The present invention relates to the control gear technical field, be specially servo water pressure control device, it is mainly used in the pressure test to seal container.
Background technique
Usually when carrying out pressure test for a seal container,, adopt high-pressure water pump to pour into the high pressure tap water and test as rocket's fuel tanks is carried out pressure test, usually adopt the pressure maintaining valve pilot pressure, because the pressure maintaining valve poor sensitivity, precision is low, therefore has the problem of pressure control shakiness.
Summary of the invention
At the problems referred to above, the invention provides servo water pressure control device, it can effectively solve the low problem of pressure maintaining valve precision in the past, guarantees pressure controlled stability.
Its technological scheme is such, it comprises the servo-hydraulic pumping plant, it is characterized in that: it also comprises electrohydraulic control and servo high-pressure oil expelling water device, described servo-hydraulic pumping plant connects described electrohydraulic control, described electrohydraulic control connects described servo high-pressure oil expelling water device, described servo high-pressure oil expelling water device connects test chamber by control module, and described electrohydraulic control, control module electricly connect with control system respectively.
It is further characterized in that: described servo high-pressure oil expelling water device comprises hydraulic fluid chamber and water cavity; Described hydraulic fluid chamber and water cavity are separated by the piston on the piston rod; Described hydraulic fluid chamber and water cavity include symmetrical two; Described two hydraulic fluid chambers are positioned at the two ends of described servo high-pressure oil expelling water device; Described water cavity is positioned at the inboard of described hydraulic fluid chamber; Described electrohydraulic control connects described hydraulic fluid chamber by pipeline; Described water cavity connects inlet pipeline and described test chamber by one-way valve respectively; Between described water cavity and the described test chamber control module is installed also; Described control module comprises accumulator and pressure transducer.
Beneficial effect of the present invention is: it sends feedback pressure signal in real time by the pressure transducer on the control module and gives control system, is realized the precision of system pressure is controlled the control accuracy height by control system control servo-hydraulic valve.
Description of drawings
Fig. 1 is a servo water pressure control device system principle schematic representation of the present invention.
Embodiment
See Fig. 1, it comprises servo-hydraulic pumping plant 22, electrohydraulic control 15 and servo high-pressure oil expelling water device 16, servo-hydraulic pumping plant 22 connects electrohydraulic control 15, electrohydraulic control 15 connects servo high-pressure oil expelling water device 16, servo high-pressure oil expelling water device 16 connects test chamber 24 by control module 23, and electrohydraulic control 15, control module 23 electricly connect with control system respectively.Servo high-pressure oil expelling water device 16 comprises hydraulic fluid chamber and water cavity; Hydraulic fluid chamber and water cavity are separated by the piston on the piston rod 33 29; Hydraulic fluid chamber and water cavity include symmetrical two, left hydraulic fluid chamber 25, left water cavity 26, right water cavity 27, right hydraulic fluid chamber 28; The two ends of the servo high-pressure oil expelling water device 16 that two hydraulic fluid chambers 25,28 are positioned at; Water cavity 26,27 is positioned at the inboard of hydraulic fluid chamber 25,28; Electrohydraulic control 15 pipelines connect hydraulic fluid chamber 25,28; Water cavity 24,27 connects inlet pipeline, outlet valve 32 connection test chambers 24 by inlet valve 17 respectively; Between water cavity 26,27 and the test chamber 24 control module 23 is installed also; Control module 23 comprises accumulator 18 and pressure transducer 23.Among Fig. 1, the servo-hydraulic pumping plant comprises that fuel tank 30,1 is a level meter, 2 is temperature transducer, and 3 is liquid level sensor, and 4 is the hydraulic pressure air-strainer, 5 is the inlet port filter, and 6 is oil pump, and 7 is motor, 8 is the precision pressure in-line filter, and 9 is one-way valve, and 10 is safety valve, 11 is electromagnetic relief valve, and 12 is pressure transducer, and 13 is pressure meter switch, 14 is pressure gauge, and 21 is the direct returning type return filter.31 are tank from the beginning, and 20 is the switch water valve on the inlet pipeline.
Pressure oil is connected the hydraulic fluid chamber 25 of servo high-pressure oil expelling water device 16 by electrohydraulic control 15,28, utilize oil pressure to promote the piston rod side-to-side movement, tap water enters the water cavity 26 of servo high-pressure oil expelling water device through switch water valve 21 and inlet valve 17,27, when piston rod 33 moves right, water cavity 26 is split into press water and enters test chamber by outlet valve 32 outputs, when piston rod 33 during to left movement, water cavity 27 is split into press water by outlet valve 32 outputs, wherein hydraulic pressure is 1.64 with the hydraulic pressure ratio, press water enters test chamber through control module 23 after the stable and detected pressures, pressure transducer on the control module 23 sends feedback pressure signal in real time and gives control system, send instruction to electrohydraulic control 15 according to system's needs by control system, thereby by regulate electrohydraulic control 15 realize precision control to system pressure, its control accuracy can reach≤2%.