CN102854899A - Water tower water level monitoring system - Google Patents

Abstract

The invention discloses a water level monitoring system of a water tower, which comprises a water tower, a water pump and a water pool which are successively connected. A third liquid level sensor and a fourth liquid level sensor are provided for monitoring the upper limit and lower limit liquid level of the pool, and the four liquid level sensors are connected with a general monitoring system through a programmable controller. The invention adopts a programmable controller for main control, installs an automatic water level measuring device on the water tower, uses the conductivity of water to continuously measure the change of the water level around the clock, and converts the measured water level change into a corresponding electrical signal. The platform uses the general monitoring system configuration software to process the received signals, and completes the corresponding water level display, fault alarm information display, report output, real-time curve and historical curve display, so that the water level is kept at an appropriate position.

Description

A water level monitoring system for a water tower

technical field

The invention relates to a monitoring system, in particular to a water level monitoring system of a water tower.

Background technique

In the process of industrial and agricultural production, it is often necessary to measure and control the water level. Water level control is also widely used in daily life, such as water level control in water towers, groundwater, hydropower stations, etc. The water level detection can be implemented in many ways, such as mechanical control, logic circuit control, electromechanical control and so on.

Programmable logic controller (PLC) is a general-purpose device for industrial automatic control with a microprocessor as the core. It has the advantages of simple structure, intuitive circuit, low price, easy operation and easy maintenance. This kind of control system has a fixed layout and works according to the pre-specified time, conditions and sequence. It is very suitable for occasions where the working mode is fixed and the requirements are relatively simple, and it is still widely used today.

In the prior art, the water level control method using a programmable logic controller (PLC) is relatively complicated.

Contents of the invention

In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a water tower water level control system.

In order to solve the above-mentioned technical problems and achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

A water tower water level monitoring system, including a water tower, a water pump and a water tank connected in succession, the water tower is provided with a first liquid level sensor and a second liquid level sensor for monitoring the upper limit and lower limit liquid level of the water tower respectively, and the water tank is provided with a water tank for monitoring The third liquid level sensor and the fourth liquid level sensor of the upper limit and lower limit liquid level of the pool, the first liquid level sensor, the second liquid level sensor, the third liquid level sensor and the fourth liquid level sensor are monitored by the programmable controller and the general purpose System connection, the specific monitoring steps are:

When the water level is lower than the lower limit level of the pool, the output signal of the fourth liquid level sensor S4 is 1, the water inlet valve operates, the pool starts to enter water, and the timer also starts timing;

After 4s, if the output signal of the switch S4 is still 1, it means that there is no water in the water inlet pipe, a fault occurs, and an alarm is generated; when the water level reaches the upper limit of the pool, the output signal of the third liquid level sensor S3 is 1, and the water inlet the valve stops working;

When the water level of the water tower is lower than the lower limit liquid level of the water tower, the output signal of the second water tower liquid level sensor S2 is on, and when the output signal of the liquid level sensor S4 is 0, the water pump operates to pump water;

When the water level of the water tower is higher than the upper limit of the water tower, that is, when the output signal of the first liquid level sensor S1 is 1, the water pump stops working.

Preferably, the first liquid level sensor, the second liquid level sensor, the third liquid level sensor and the fourth liquid level sensor are connected to the input/output interface of the programmable controller.

The present invention has the following advantages: the water tower water level monitoring system of the present invention adopts a programmable controller for main control, installs an automatic water level measuring device on the water tower, utilizes the conductivity of water to continuously measure the change of the water level around the clock, and the measured The water level changes are converted into corresponding electrical signals, and the main console uses the general monitoring system configuration software to process the received signals to complete the corresponding water level display, fault alarm information display, report output, real-time curve and historical curve display, Keep the water level in place.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly and implement them according to the contents of the description, the preferred embodiments of the present invention and accompanying drawings are described in detail below. The specific embodiment of the present invention is given in detail by the following examples and accompanying drawings.

Description of drawings

Fig. 1 is the schematic diagram of water tower water level monitoring system of the present invention.

Fig. 2 is the programmable controller control flowchart of the water tower water level monitoring system of the present invention.

Explanation of symbols in the figure: S1. The first liquid level sensor, S2. The second liquid level sensor, S3. The third liquid level sensor, S4. The fourth liquid level sensor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the technical implementation process of the present invention is described further.

As shown in Fig. 1, a water tower water level monitoring system includes successively connected water towers, water pumps and pools, the water tower is provided with a first liquid level sensor S1 and a second liquid level sensor for monitoring the upper and lower limit liquid levels of the water tower respectively S2, the pool is equipped with a third liquid level sensor S3 and a fourth liquid level sensor S4 for monitoring the upper limit and lower limit liquid level of the pool, the first liquid level sensor S1, the second liquid level sensor S2, the third liquid level sensor S3 and The fourth liquid level sensor S4 is connected to the general monitoring system through a programmable controller, and the specific monitoring steps are:

When the water level is lower than the lower limit liquid level of the pool, the output signal of the fourth liquid level sensor S4 is 1, that is, the switch state of the fourth liquid level sensor S4 is 0N, the water inlet valve operates, the pool starts to enter water, and the timer also starts timing;

After 4s, if the output signal of the third liquid level sensor S4 is still 1, that is, the switch state of the third liquid level sensor S3 is ON, which means that there is no water in the water inlet pipe, a fault occurs, and an alarm is generated; when the water level reaches the upper limit of the pool At the liquid level position, the output signal of the third liquid level sensor S3 is 1, that is, the switch state at the third liquid level sensor S3 is ON, and the water inlet valve stops working;

When the water level of the water tower is lower than the lower limit liquid level of the water tower, the output signal of the second water tower liquid level sensor S2 is 1, that is, the switch state of the third liquid level sensor S3 is ON, and the output signal of the liquid level sensor S4 is 0, that is, When there is water storage, the water pump runs to pump water;

When the water level of the water tower is higher than the upper limit of the water tower, that is, the output signal of the first liquid level sensor S1 is 1, that is, the water level of the water tower is higher than the upper limit of the water tower, and the water pump stops working.

The first liquid level sensor S1, the second liquid level sensor S2, the third liquid level sensor S3 and the fourth liquid level sensor S4 are connected to the input/output interface of the programmable controller, and the interface allocation table is shown in Table 1 below: Table 1 The input/output interface allocation table of the water tower water level monitoring system PLC

input signal Enter variable name output signal output variable name X000 control switch Y000 Inlet valve X001 Water tower upper limit liquid level sensor switch Y001 water pump X002 Water tower lower limit liquid level sensor switch Y002 warning light X003 Pool upper limit liquid level sensor switch the the X004 Pool lower limit liquid level sensor switch the the

According to the control requirements and control analysis, set 5 switches, the number of switch output contacts is 3, the number of input and output contacts is 8, and the general small and medium-sized controller can be used. Accordingly, address allocation can be made to input and output points.

The PLC control flow of the water tower water level monitoring system is shown in Figure 2.

According to control requirements, in order to realize water level control, set 2 timers: T0——4s delay, the preset value of timing is 40; T2——alarm flashing, the preset value of timing is 5.

Working process: The initial state of the water tower and the pool is set to be empty. When the program is executed, when the liquid level of the pool is scanned to be lower than the lower limit level of the pool, the water inlet valve will be opened and water will start to enter the pool. If the water intake exceeds 4 seconds, and the pool liquid level does not exceed the lower limit level of the pool, indicating that the system is faulty, and the system will automatically alarm. If the liquid level of the pool exceeds the lower limit of the pool after 4 seconds, it means that the system is working normally. At this time, the liquid level of the pool has exceeded the lower limit. When the system detects this signal, since the liquid level of the water tower is lower than the lower limit liquid level of the water tower, the water pump starts to work and supplies water to the water tower. However, at this time, the liquid level of the water tower has exceeded the lower limit liquid level of the water tower, and the water pump continues to work. When the water tower is pumped to supply water to the water tower, when the water tower is full, the liquid level of the water tower exceeds the upper limit liquid level of the water tower, but when the water tower is just supplied with water, the water pump has already The water in the pool is pumped away. At this time, the liquid level of the pool is already lower than the upper limit level of the pool. This time, the water supply to the water tower is completed.

The above-mentioned embodiments are just to illustrate the technical conception and characteristics of the present invention. The purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention shall fall within the protection scope of the present invention. the

Claims (2)

1. water tower level supervisory system, it is characterized in that, comprise the water tower that in succession connects, water pump and pond, be provided with the first liquid level sensor S1 and the second liquid level sensor S2 that are respectively applied to monitor water tower upper and lower bound liquid level in the water tower, be provided with the 3rd liquid level sensor S3 and the 4th liquid level sensor S4 for monitoring pond upper and lower bound liquid level in the pond, the first liquid level sensor S1, the second liquid level sensor S2, the 3rd liquid level sensor S3 is connected with universal monitoring system by Programmable Logic Controller with the 4th liquid level sensor S4, and the concrete monitoring step of described universal monitoring system is as follows:

When water level was lower than the pond bottom limit level, the 4th liquid level sensor S4 output signal was 1, the water intaking valve running, and the pond begins water inlet, and timer also carries out timing simultaneously;

Behind the 4s, if the output signal of switch S 4 still is 1, not water inlet is broken down in the expression water inlet pipe, produces and reports to the police; When water level reached upper limit liquid level position, pond, the 3rd liquid level sensor S3 output signal was 1, and water intaking valve quits work;

When water tower level was lower than the water tower bottom limit level, the second water tower liquid level sensor S2 output signal was 1, and liquid level sensor S4 output signal is 0 o'clock, and pump operation draws water;

When water tower level was higher than water tower upper limit liquid level, namely the first liquid level sensor S1 output signal was 1 o'clock, and water pump quits work.

2. according to claims 1 described water tower level supervisory system, it is characterized in that: described the first liquid level sensor S1, the second liquid level sensor S2, the 3rd liquid level sensor S3 and the 4th liquid level sensor S4 are connected on the input/output interface of Programmable Logic Controller.

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