CN2462363Y - Liquid level controller - Google Patents

Abstract

The utility model relates to a liquid level controller. A plastic pipe is vertically arranged beside a container of which the liquid level is to be controlled; the lower end of the plastic pipe is communicated with the bottom part of the container, and the upper end is communicated with the top part of the container; a floating body is positioned in the plastic pipe and can change with the variation of the liquid level in the container; an upper limit point and a lower limit point abutting the wall of the plastic pipe are respectively provided with a reed tube; the lower limit reed tube is connected in parallel with a group of normally open contacts J1 of a relay, and then is connected in series with a resistor R and the relay J, and the lower limit reed tube, the resistor and the relay are all together connected to both ends of a DC power supply. The upper limit reed tube is connected in parallel with the relay J, and a normally open contact J2 of the relay is connected with a liquid pump control circuit.

Description

Fluid level controller

The utility model relates to a kind of fluid level controller, relates in particular to a kind of liquid level control circuit.

Background technology of the present utility model: existing liquid level control circuit, great majority all are made up of triode and some other components and parts, or are made up of integrated circuit and other components and parts.The weak point of foregoing circuit: the one, the circuit structure complexity, component number is many, poor reliability; The 2nd, the manufacturing cost height.

Purpose of design of the present utility model: avoid the weak point in the background technology, design that a kind of circuit structure is simple, component number is few, reliable working performance and fluid level controller cheap for manufacturing cost.

Design proposal of the present utility model: the utility model comprises a relay that contains two groups of normally opened contacts, resistance, contains two tongue tubes and the supply unit of one group of normally opened contact respectively.Wherein tongue tube and relay coil parallel connection, one terminates at the output terminal of power supply, an end of another relay termination normally opened contact and tongue tube.The another tongue tube is attempted by relay contact J ₁Two ends, wherein connect the output terminal of power supply behind the end series resistor R.Above-mentioned two tongue tubes, wherein control that is used for the liquid level lower limit, another is used for the control of the liquid level upper limit.Another group normally opened contact of relay is connected in the liquid pump circuit, is used to control the startup of liquid pump.Liquid container next door in needs control liquid level is equipped with a plastic tube perpendicular to the ground, and this pipe lower end communicates with container bottom.This plastic tube contains a buoyancy aid, and it is made up of float and permanent magnet, and this buoyancy aid floats on the liquid level, can change along with the variation of liquid level.Near plastic tube tube wall place, at the liquid level upper limit place and the lower limit place of needs control a tongue tube is installed respectively, when buoyancy aid arrived its next door, this reed pipe closure disconnected when leaving.Its organization plan: a kind of fluid level controller, it comprises power circuit, a plastic tube vertically is equipped with on the next door of controlling the liquid container of liquid level at needs, the lower end of plastic tube communicates with container bottom, the upper end communicates with the top of container, buoyancy aid is positioned at plastic tube and changes with the variation of vessel level, respectively there is a tongue tube at upper limit place and lower limit place near plastic tube wall, one group of normally opened contact J1 parallel connection of lower limit tongue tube and relay, after connecting, resistance R and relay J be connected on the two ends of direct supply again, upper limit tongue tube is in parallel with relay J, and relay normally open point J2 connects the liquid pump control circuit.Its principle of work: when liquid level dropped to bottom limit level, the tongue tube closure at this place was impelled in the magnetic field of permanent magnet.So power supply is powered to relay through resistance, after the relay adhesive, its two groups of normally opened contacts all are closed, and liquid pump is activated.After liquid level rose, buoyancy aid also rose, and the tongue tube of former closure disconnects, because the relay one group normally opened contact in parallel with tongue tube is to be closed already before reed pipe disconnects.Therefore, circuit still is kept closed, and liquid pump is work still, and liquid level continues to rise.When liquid level rose to upper limit liquid level, the tongue tube closure at this place was because this tongue tube is in parallel with relay, the relay two ends are by short circuit after the tongue tube closure, and power supply acts on the resistance entirely, and relay is released, its two groups of normally opened contacts all are disconnected, and liquid pump quits work, and liquid level no longer rises.When relay during just by short circuit, its contact in parallel with tongue tube just disconnects at once.Therefore, the electric current in the circuit disappears at once.When liquid level descended, buoyancy aid also descended, so the tongue tube of upper end disconnects.At this moment, relay is release conditions still, and liquid pump is not worked.Reduce to down in limited time when liquid level, it is closed again that this locates tongue tube, and circuit repeats said process.Liquid level is remained between upper and lower limit.

The utility model is compared with background technology, and the one, this fluid level controller adopts the detecting head of tongue tube as fluid level controller, has avoided the liquid-level probe that exists in the background technology because of polarization phenomena that electrolytic reaction produced and avoided the contaminated phenomenon of probe; The 2nd, circuit is simple, stable and reliable working performance and with low cost.

Description of drawings:

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

1 pair of the utility model is done with narration in conjunction with the accompanying drawings.With reference to accompanying drawing 1.A kind of fluid level controller, it comprises power circuit, and a plastic tube vertically is equipped with on the next door of controlling the liquid container of liquid level at needs, and the lower end of plastic tube communicates with container bottom, and the upper end communicates with container top.Buoyancy aid is positioned at plastic tube and changes with the variation of vessel level, respectively there is a tongue tube at upper limit place and lower limit place near plastic tube wall, the two ends of upper limit tongue tube are attempted by the two ends of relay coil and an end of power output end, the end of relay normally open contact J1, an end of lower limit tongue tube, the other end of another relay termination normally opened contact J1 of lower limit tongue tube, an end of resistance R, another termination power output end of R, relay normally open contact J2 connects the liquid pump control circuit.It in the dashed rectangle power circuit.This circuit comprises two tongue tube A, B except that power circuit, a resistance R, a relay J.J1 and J2 are two groups of normally opened contacts of relay J among the figure.One group of normally opened contact J1 parallel connection of tongue tube B and relay connects the two ends of direct supply again after resistance R and relay J are connected.Tongue tube A is in parallel with relay J.Tongue tube B is used for the lower control limit liquid level, and A is used for the upper control limit liquid level.Another group normally opened contact J2 of relay is used to control liquid pump.C is a buoyancy aid among the figure, and buoyancy aid is made up of float and permanent magnet.D is a plastic tube.E is a liquid container.When liquid level is reduced to tongue tube B place, this tongue tube closure, through resistance R, tongue tube B relay J flows to negative pole to electric current from positive pole, so the relay adhesive, contact J1, J2 are closed.Liquid pump is started working, and after liquid level rose, tongue tube B disconnected, but because contact J1 is still closed, relay is adhesive still, and liquid pump works on, when liquid level rises to tongue tube A place, this tongue tube closure, this moment relay two ends by short circuit, electric current from positive pole through resistance R, contact J1, tongue tube A direct current to negative pole, relay is released, contact J1, J2 disconnect, and water pump quits work, and liquid level no longer rises.Make buoyancy aid leave tongue tube A place when liquid level descends, this tongue tube disconnects.The contact of tongue tube is open in usual.Liquid pump is not still worked.When liquid level was reduced to tongue tube B place, this tongue tube was closed again, and circuit repeats said process.Liquid level is remained between two tongue tubes.

Claims (3)

1, a kind of fluid level controller, it comprises power circuit, it is characterized in that: a plastic tube vertically is equipped with on the next door of controlling the liquid container of liquid level at needs, the lower end of plastic tube communicates with container bottom, the upper end communicates with container top, buoyancy aid is positioned at plastic tube and changes with the variation of vessel level, respectively there is a tongue tube at upper limit place and lower limit place near plastic tube wall, one group of normally opened contact J1 parallel connection of lower limit tongue tube and relay, after connecting, resistance R and relay J be connected on the two ends of direct supply again, upper limit tongue tube is in parallel with relay J, and relay normally open point J2 connects the liquid pump control circuit.

2, fluid level controller according to claim 1 is characterized in that: buoyancy aid is made up of float and permanent magnet.

3, fluid level controller according to claim 1 is characterized in that: the contact of tongue tube is normal battle of a formula.