CN201258989Y

CN201258989Y - Electric backflow preventer

Info

Publication number: CN201258989Y
Application number: CNU2008201362122U
Authority: CN
Inventors: 马戌寰
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-17
Filing date: 2008-09-17
Publication date: 2009-06-17
Anticipated expiration: 2018-09-17

Abstract

The utility model discloses an energy-saving backflow preventer which has a simple structure, moves reliably and can reduce the loss of water tap to a large extent. The structure of the utility model is as follows: a short pipe is clamped in the middle of two universal check valves and used as a main body; the value or state of a differential pressure before and after that water enters the check valves measured by a differential pressure meter is used as the moving basis of a relief valve; and a solenoid pilot actuated valve is used as a middle cavity relief valve. The water tap loss of the utility model is only the partial resistance loss of a water flow passing through the two check valves, thus saving energies. Meanwhile, the differential pressure measured by the differential pressure meter is sensitive and accurate; the relief valve controlled by electric power moves reliably, thus being capable of avoiding the leakage and error motions.

Description

Electronic backflow preventer

Technical field

The utility model relates to a kind of water work.

Technical background

Existing backflow preventer is to add an intermediate cavity drain valve to form between water inlet and two safety check of water outlet.Working principle is to close and normal water supply with the pressure reduction △ P promotion intermediate cavity drain valve of intermediate cavity before utilizing the water inlet safety check, when making pressure reduction △ P not in normal range (NR) because of certain reason, drain valve is then opened automatically and is discharged intermediate cavity ponding, air enters intermediate cavity and forms the air partition, thereby has prevented backflow.Reliable for machinery action, ensure the Security that cuts off, △ P pressure difference must be enough big.Therefore, energy is taken greatly in the local head loss of the out-of-date generation of MEDIA FLOW.In addition, such plant machinery structure is complicated, build heaviness, installation, maintenance and field adjustable inconvenience and shortcoming such as seepage phenomenon is often arranged.

Summary of the invention

The purpose of this utility model is to provide a kind of simple in structure, reliable in action and reduces the energy-saving backflow preventer of loss of head significantly.

Electronic backflow preventer described in the utility model realizes that the above-mentioned purpose technological scheme is as follows:

In the centre of two universal safety check, clamp a short tube, the short tube of described centre is provided with the waste pipe that solenoid valve is installed, and is connected differential manometer by PRESSURE PIPE before the water inlet safety check with on the middle short tube; Differential manometer is measured pressure reduction △ P signal and is inputed to connected controller, and the output terminal of this controller connects unlatching, the closing control end of solenoid valve.

Centre at two universal safety check of above-mentioned electronic backflow preventer clamps the together short tube of bore.

The utlity model has following advantage and good effect:

1, hydraulic loss only is the local resistance loss of current by two safety check, thereby energy-conservation.

2, simple in structure, external form is light and handy, installation and maintenance are convenient.

3, the differential pressure value sensitivity that goes out by instrument measurements such as differential manometers, accurate; Reliable with electric power as the valve event of external force control, thereby can avoid the generation of seepage and misoperation.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

Below with reference to Fig. 1, embodiment of the present utility model is further described.

Between water intake safety check 1 and the water outlet safety check 3, clamp together bore short tube 2, solenoid valve 4 is connected on the waste pipe of short tube.Solenoid valve 4 cuts out during normal water supply.

Differential manometer 7 is connected on water intake safety check front end and the middle short tube by

PRESSURE PIPE

8,9, measures pressure at two ends difference △ P.Electrical signal output is then arranged when making pressure reduction △ P not at the normal water supply state because of certain reason, instruction control unit 5 is opened it and is discharged middle short tube ponding to solenoid valve 4 feeds, forms air and cuts off, avoid the generation that refluxes, valve is closed in outage automatically when △ P recovers normal state.Described controller 5 is common computer controller.

Power supply 6 is uninterruption power sources that electric power is provided for instrument and solenoid valve, because required electric power is very little, is easy to configuration.In Fig. 1, dotted line is an electric control circuit.

The technical solution of the utility model also can be by the following technical solutions, replace the part control unit in the technique scheme, for example with carrying out in gauge external after the force value of differential pressure switch, differential pressure transmitter or independent measurement water intake, intermediate cavity and water outlet in method replacement the utility model scheme such as differential pressure calculation it " differential manometer ".For another example, replace solenoid valve in the utility model scheme etc. with little mortor operated valve.

Claims

1, a kind of electronic backflow preventer is characterized in that: in the centre of two universal safety check, clamp a short tube, the short tube of described centre is provided with the waste pipe that solenoid valve is installed, and is connected differential manometer by PRESSURE PIPE before the water inlet safety check with on the middle short tube; Differential manometer is measured pressure reduction △ P signal and is inputed to connected controller, and the output terminal of this controller connects unlatching, the closing control end of solenoid valve.

2, a kind of electronic backflow preventer as claimed in claim 1 is characterized in that: clamp the together short tube of bore in the centre of two universal safety check.