CN202040419U - Anti-flooding automatic control water valve - Google Patents

Abstract

The utility model relates to a water-out prevention automatic control water valve which consists of a power supply circuit, a monitoring circuit, a control circuit, two flow sensors and an electric butterfly valve. The electric butterfly valve and the two flow sensors are arranged on a water supply pipeline without a branch water outlet along the water flow direction sequentially. After being arranged, the device is in a normally-open state. When water flows in the pipeline, the two flow sensors send signals; the monitoring circuit receives the signals sent by the flow sensors and compares the signals; and if the monitoring circuit observes that the downstream flow is lower than the upstream flow, which shows that the water pipe can be broken, a driving signal is sent so that the electric butterfly valve is closed and the water supply pipeline is automatically switched off. The water-out prevention automatic control water valve has the characteristics that the water-out prevention automatic control water valve is convenient to install, is reliable to work, is flexible to control, has low cost and the like. The water-out prevention automatic control water valve can be widely used as a water valve of a main pipeline or a branch pipeline for controlling water supply.

Description

Anti-flooding automatic control water valve

technical field

The utility model is an automatic control water valve for preventing flooding, which belongs to the technical field of valve detection and automatic control. the

Background technique

In our daily life, we often see water supply pipes bursting or being dug up by construction parties to form fountains. Sometimes the water will flood Jinshan, and the water will flow mercilessly into the residents or shops on the first floor, indoor clothing, furniture, electrical appliances, Commodities, etc. are soaked in water to cause significant losses, and precious water resources are also wasted in large quantities. Therefore, it is very necessary to develop a kind of anti-flooding automatic control water valve that can be automatically closed when the water pipe bursts or is dug off. Especially to save water resource, more show its necessity. the

Contents of the invention

In view of the problems in real life, the purpose of this utility model is to develop a device that can automatically close the water delivery valve when the water supply pipe bursts or is cut off. The utility model has the advantages of convenient installation, reliable operation, sensitive control, The utility model has the characteristics of low cost and can be widely used in water valves controlling main pipelines or branch pipelines of water supply. the

The technical scheme of the utility model is as follows: the anti-flooding automatic control water valve is composed of a power supply circuit, a monitoring circuit, a control circuit, two flow sensors, and an electric butterfly valve. The electric butterfly valve and two flow sensors are installed sequentially along the water flow direction on the water supply pipeline without branch outlets. There is no distance limit between the two flow sensors. The device is normally open after installation. When there is water flowing in the pipeline, the two flow sensors send out signals, and the monitoring circuit receives the signals from the flow sensors for comparison. If the downstream flow rate is found to be less than the upstream flow rate, it indicates that the water pipe is broken, and a driving signal is sent to close the electric butterfly valve and automatically cut off the water supply. pipeline. the

Compared with the prior art, the utility model has the beneficial effects that the water valve can be automatically closed when the water supply pipe bursts or is cut off, which not only prevents property loss caused by flooding, but also saves precious water resources. the

Description of drawings

The utility model has four accompanying drawings, wherein:

Fig. 1 is a waterway structural diagram of an automatic control water valve for preventing flooding. the

Figure 2 is a monitoring circuit diagram. the

Figure 3 is a control circuit diagram. the

Figure 4 is a power circuit diagram. the

In the figure: 1-water supply pipe 2-arrow indicates water flow direction 3-electric butterfly valve 4-first flow meter 5-second flow meter 6-branch water supply pipe

Detailed ways

The waterway connection is shown in Figure 1, the water outlet of the electric butterfly valve 3 is sealed and connected with the water inlet of the first flow meter 4, the water inlet of the second flow meter 5 is sealed and connected with the water outlet of the first flow meter 4 through the water supply pipe, and The water supply pipe between the first flow meter 4 and the second flow meter 5 has no branch water outlet. the

See Figure 2 for the connection of the monitoring circuit. I ₁ and I ₂ are the 4-20mA electrical signals output by the second flowmeter 5 and the first _{flowmeter 4} respectively. V _CC1 and V _EE1 in the corresponding connection. Both IC1+IC4 and IC2+IC5 use LF353p; IC3 uses LF398p; IC6 uses NE555p.

The connection of the control circuit is shown in Figure 3. The part in the dotted line box is the electric butterfly valve contact signal output circuit diagram, and V _CC and V _EE are connected to V _CC and V _EE in Figure 4.

See Figure 4 for the connection of the power supply circuit. the

The specific working principle is as follows:

I ₁ is the 4-20mA electrical signal output by the second flowmeter 5, which is converted into a corresponding 1-5V voltage signal through the resistor R1. Smoothed by R3 and C1, output by IC1 follower. IC3, IC4 and peripheral R4~R8, C3 form a peak hold circuit, record the maximum flow signal within a certain period of time, and output it from pin 5 of IC3.

I ₂ is the 4-20mA electrical signal output by the first flowmeter 4, which is converted into a 0.88-4.4V voltage signal by the resistor R2. Smoothed by R9 and C2, output through IC2 follower.

The two-way signals output by IC3 and IC2 are compared by the IC5 comparator. When the output signal of IC2 is greater than the output signal of IC3, it means that there is water leakage in the pipeline connected between the first flowmeter 4 and the second flowmeter 5, and the output of the comparator IC5 changes. If it is high level, the R-S flip-flop formed by IC6 jumps to low level, and the relay J1 is activated through R15 and Q1, so that the ③ pin of the electric butterfly valve 3 is energized and closed. the

Since this design uses a peak hold circuit composed of LF398p, when the sampling capacitor C3 is 0.01μF, the drop rate of its output voltage is only 3mV/s. Although the I ₁ and I ₂ signals have a delay, due to the value of R2 If the value is less than R1, if the water supply pipe between the first flowmeter 4 and the second flowmeter 5 is not damaged, the voltage across the resistor R1 will always be greater than the voltage across the resistor R2, thus effectively avoiding malfunctions . If the monitoring pipeline is too long, the signal delay time of I ₁ and I ₂ will be further increased, and the method of increasing C3 can be adopted to ensure the reliable operation of the circuit.

When the electric butterfly valve 3 is completely closed, the ⑥ pin of the electric butterfly valve 3 outputs a low level, which resets IC6, J1 loses power, and the electric butterfly valve 3 stops acting. Before repairing the damaged water supply pipe, in order to ensure absolute safety, disconnect K2. After repairing, press K1 to energize pin ② of the electric butterfly valve 3 and open it. When it is fully opened, the ⑤ pin of the electric butterfly valve 3 outputs a low level, so that J2 loses power, and the electric butterfly valve 3 stops acting. After the water flow in the water supply pipe is stable, close K2 to make the monitoring circuit enter the working state. the

The utility model is convenient and practical to solve the waste of water resources and the inconvenience of life caused by the rupture of the water pipe. It has the characteristics of convenient installation, reliable operation, sensitive control, and low cost. valve. the

Claims (1)

1. An anti-flooding automatic control water valve, which is composed of a power supply circuit, a monitoring circuit, a control circuit, two flow sensors, and an electric butterfly valve, characterized in that: the water outlet of the electric butterfly valve (3) is connected to the first flow meter (4 ), the water inlet of the second flowmeter (5) is sealed connected with the water outlet of the first flowmeter (4) through the water supply pipe, and the first flowmeter (4) and the second flowmeter (5) The water supply pipe between them has no branch outlet, the signal wires of the first flowmeter (4) and the second flowmeter (5) are connected to the monitoring circuit, the output signal wires of the monitoring circuit are connected to the control circuit, and the output signal wires of the control circuit Connect the electric butterfly valve (3). the

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