CN86202834U - Interface controller - Google Patents

Abstract

The utility model relates to an interface controller for the controlling the surface parting positions of two kinds of the liquid. The controller uses corrugated pipes as differential pressure detecting units and adopts the fluid insulation medium to transfer the pressure inside the controller; the inside of the liquid insulating medium forms the control signal and effectively eliminates the influence of interfering factors except the pressure difference to the measuring and the interference of the measured liquid to the signal circuit. The utility model has higher control precision and reliable operating, and long service life and can adjust the given position of the controlled liquid parting surface in larger range. The controller can be used for controlling the automatic water discharge of the oil tank and the electrical desalter and can also be used for other conditions that the positions of the parting surface of two kinds of the liquid needs to be controlled.

Description

Interface controller

The utility model is the invention about the interfacial level controller of controlling two kinds of liquid interface positions.

In order to control the interphase of two kinds of liquid in the container, so far one of used method is floating drum (or float) detection method, between the proportion of proportion two kinds of liquid in container of selection floating drum, make on its interphase that is suspended in two kinds of liquid, utilize floating drum to remove to drive electronic or pneumatic switch, the output control signal with the lifting of liquid interface.The difference in specific gravity of the method two kinds of liquid in container is little, perhaps on interphase, mix serious mutually, and the viscosity of liquid is big, under the situation of purity difference, because adhering on floating drum such as colloid in viscous liquid and the liquid and impurity, with the proportion of floating drum is changed, be difficult to be suspended in steadily in the long term on the interphase of liquid.The method and be difficult in the scope of broad regulating interfacial position.The other method of two kinds of liquid interface is capacitance detecting methods in the control container.Two insulating electrodes are installed in a certain position in the liquid container, form a capacitor.When the liquid of differing dielectric constant enters between two electrodes, this condenser capacity will change, and this variable quantity be detected through translation circuit be transformed into control signal.This scheme control circuit complex structure, close or on interphase, mix mutually when serious when two kinds of liquid dielectric, be difficult for drawing correct result.And the versatility under the different situations is poor.When needs were regulated interfacial position, inconvenience was used in the installation site of the electrode that only changes.It is conductance detection that a kind of common control method is arranged again.Two conductor electrodes are installed in a certain position in the container, add alternating voltage between electrode, when the liquid of different conductivity enters between two electrodes, the electric current that detects the loop will change, this variable quantity is detected, do control signal output, but the method is close or mix mutually when serious at two kinds of liquid electric conductivities, is difficult to draw correct result on interphase.And when liquid viscosity is big, during purity difference, because adhering on electrode such as colloid in high viscosity liquid and the liquid and impurity, and the conductive capability of electrode is descended, detects malfunctioningly, so can not long-term stability work reliably.When needs are regulated interfacial position, also need to change the installation site of electrode, use inconvenience.Other method that can be used for the control of liquid in containers interphase also has the interphase of ultrasonic Detection Method and gamma-ray reflection or absorption measurement liquid, the output control signal.But apparatus structure is all very complicated, the cost height.Close or mix detection difficult when serious mutually when the physical property of two kinds of liquid on the interphase.

The purpose of this utility model provides a kind of general controls the parts----interfacial level controller that can export control signal according to the variation of two kinds of liquid interface positions in the container.It is simple in structure, and cost is low, can long-term stability work reliably, and can regulate the given position at controlled interface simply in the scope of broad.

Solution is: the corrugated tube that two useful area equate is installed in airtight housing, and the inner chamber of one of them corrugated tube leads to the interfacial top of controlled fluid through conduit, experiences the pressure of interphase upper liquid.The inner chamber of another corrugated tube leads to the bottom of liquid container through conduit, experiences the general pressure of liquid.In closed shell, be full of transformer oil or hydraulic pressure wet goods liquid insulating medium, constitute one in controller inside the differential pressure detector by liquid transfering pressure.One of method that forms control signal is, the top of a corrugated tube and on the housing of relative position a pair of contact electrode is housed with it therein is by the break-make of this electrode of extension and contraction control of corrugated tube, output control signal, thereby control executive component action.

This controller is owing to adopt corrugated tube to make the differential pressure detection part, adopt liquid insulating medium between two corrugated tubes, to transmit pressure again, and in liquid insulating medium, form control signal, like this, just realized fluid to be measured and the isolation that detects the loop effectively, eliminated of the influence of pressure differential factor in addition measuring.Therefore, as long as have certain difference in specific gravity between tested two kinds of liquid and the interphase that can offer an explanation arranged, just can long-term stability operate as normal reliably.Simultaneously, because the corrugated tube useful area is bigger, thereby has higher sensitivity, can reach high control precision.Another advantage of the present utility model is because electrode contacts is enclosed in the insulating medium in the closed shell, thereby avoided contact spark to the igniting of inflammable gas, and is safe in utilization.Simultaneously, because the buffer action of liquid insulating medium, weaken or eliminated contact spark, alleviate or avoided the contact, also avoided the aerial oxidation in contact, prolonged the serviceable life of contact because of carbon deposit and ablation that sparking forms.

This controller in use airtight end of corrugated tube is upwards flatly installed, and makes the bellows interior gassy, forms the sealing gland to corrugated tube, to isolate fluid to be measured, reduces pollution and corrosion to corrugated tube, prolongs the serviceable life of corrugated tube.

Improvement of the present utility model is to make the distance between contact electrode two contacts adjustable, to be used to regulate the given position of controlled interface.

Further improvement of the utility model is to utilize permanent magnet that the graviational interaction of magnetic material is partnered to have the contact electrode of return difference function----magnetic control return difference electrode, make the break-make stable working state of electrode reliable, avoid impact and the too frequent action of execution unit of the unstable control signal that produces owing to loose contact execution unit.

Accompanying drawing has been described an embodiment of the present utility model.

Accompanying drawing 1: the structural representation of interfacial level controller.

Accompanying drawing 2: the partial enlarged drawing of magnetic control return difference electrode.

Accompanying drawing 3 a: application example of this interfacial level controller.

Fig. 1 has described this interfacial level controller.Housing 1,2 inner chamber was communicated with by communicating pipe 3, the vent hole 4 of oiling is arranged on the housing 1, on the lower cover 5 of housing 1 corrugated tube 6 is installed, its inner chamber is communicated with fluid to be measured through fairlead 7, on the lower cover 8 of housing 2 corrugated tube 9 is installed, its inner chamber is communicated with fluid to be measured through fairlead 10, oiling vent hole 12 is installed on the loam cake 11 of housing 2, magnetic control return difference electrode regulating portion 13 with loam cake 11 insulation, and with the electrode terminal 14 of loam cake 11 insulation, 14 pass through flexible circuit conductor 15 is connected with electrode slice 16, has below 16 under the permanent magnet 17,17 to be isolated by insulating trip 18 and corrugated tube 9 electricity.

Fig. 2, adjusting screw(rod) 19 is fixed on the lining 21 by screw thread 20, lining 21 is fixed on the loam cake 11 of shell 2 by nut 22, packoff 23 is finished the insulation and the sealing of lining 21 and loam cake 11, pressure cap 24, sealing gasket 25 is finished the sealing of adjusting screw(rod) 19, is installed in the movable electrical contact of being made by the magnetic conductive material 27 of regulating in nut 26 inner chambers is pressed on adjusting screw(rod) 19 by spring 28 bottom.

Fig. 3 is used to control the sidewall that interfacial level controller top that oil tank discharges water automatically flatly is installed in oil tank 29 up, and fairlead 7 enters oil tank through valves 30 levels, experiences oil pressure on oil water surface 31.Fairlead 10 flatly enters oil tank through valve 32 and guides to tank bottom after prolong pipe 33, the general pressure of impression jar end profit.When oil water surface 31 raises, the pressure of corrugated tube 9 inner chambers raises, make its elongation, permanent magnet 17 and electrode slice 16 are close to another contact of magnetic control return difference electrode----magnetic armature contact 27 thereupon, simultaneously, compress bellows 6, when permanent magnet 17 and electrode slice 16 near magnetic armature contact 27 during to a certain position, under the effect of magnetic pull, armature contact 27 compression springs 28 and electrode slice 16 adhesives, by the binding post 14 output control signals of magnetic control return difference electrode regulating portion 13 and electrode slice 16, control executing mechanism discharges water.Along with the discharge of water, oil water surface 31 descends, and corrugated tube 9 is shunk and corrugated tube 6 elongations, and when oil water surface dropped to a certain position, electrode slice 16 was thrown off with armature contact 27, stops to discharge water.Work so again and again.The main effect of the corrugated tube 6 that equates with corrugated tube 9 useful area is the influences of when offsetting top layer liquid (oil) face height change interface 31 being measured, and isolates fluid to be measured simultaneously, avoids the interference of fluid to be measured to signal circuit.Utilize the elasticity of corrugated tube, can adjust the given position of interphase 31, utilize the effect of spring 28, the return difference amount that interface location changes between can being switched on and off by adjusting nut 26 adjustment electrodes by adjusting screw(rod) 19.

Claims (3)

1, a kind of interfacial level controller that is used to control two kinds of liquid interface positions, it is characterized in that: the corrugated tube that two useful area equate is housed in airtight housing, full of liquid insulating medium in the housing, constitute one in controller inside the differential pressure detector by liquid transfering pressure, the contact electrode of a pair of extension and contraction control break-make by corrugated tube is housed on it.

2, interfacial level controller as claimed in claim 1 is characterized in that: can adjust the distance between two contacts of electrode.

3, as the interfacial level controller of claim 1 or claim 2, it is characterized in that: the contact electrode that has the return difference function----the magnetic control return difference electrode that utilizes permanent magnet that the graviational interaction of magnetic material is made.

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