Fire water pressure control system

Abstract

The utility model relates to fire control system technical field discloses a kind of fire water pressure control systems, including water pump and fire pipe network, pressure detector is located in the main pipeline of fire pipe network, controller is connected with the output end of pressure detector, star delta starting circuit is connected with the output end of controller, and is connected with the input end of water pump, electric valve is connected with the output end of controller, for controlling water flow break and flow regulation.The utility model detects the pressure value in the main pipeline of fire pipe network in real time by setting pressure detector, when fire pipe network is used, when pressure value increases, water pump is automatically opened by controller and the opening of electric valve is adjusted, improve fire water pump response time, water pump and electric valve linkage, controller automatically adjusts water pump opening and closing according to the pressure value in fire pipe network, avoid the power consumption caused by water pump 24 hours always open.

Description

Technical Field

[0001] This utility model relates to the field of fire control system technology, and in particular to a fire water pressure control system. Background Technology

[0002] Factories and warehouses typically contain a large amount of general goods and heavy equipment, making them prone to fire. Therefore, fire protection networks are essential in these areas to rapidly provide a large water supply in the event of a fire. These networks can be equipped with multiple fire hydrants and sprinklers, covering all areas of the factory or warehouse. Consequently, the control and response of these fire protection networks are crucial.

[0003] Traditional solutions employ star-delta starting circuits composed of discrete components such as AC contactors and time relays, which have the following problems:

[0004] 1. Fire pump response delay: When a fire occurs, the pump needs to be started and the valve closed manually, which delays the opportunity to extinguish the fire;

[0005] 2. Low reliability of fire pump control: Manual operation is prone to sudden rises / falls in water pressure, causing the pump coil to burn out, with a failure rate >30%;

[0006] 3. High maintenance costs: Requires dedicated personnel to be on duty 24 hours a day, increasing labor costs by approximately 40%;

[0007] 4. High power consumption: To maintain the pressure of the on-site pipeline network 24 hours a day, the 15KW water pump needs to be kept running 24 hours a day, resulting in high power consumption. Utility Model Content

[0008] The purpose of this invention is to provide a fire water pressure control system to solve the problems in the prior art, which can automatically maintain the pressure of the fire pipeline network, respond quickly to fire situations, and reduce equipment failure rate.

[0009] This utility model provides a fire water pressure control system, including a water pump and a fire pipeline network, and further includes:

[0010] A pressure detector is installed inside the main pipeline of the fire protection network to detect the pressure signal inside the main pipeline;

[0011] The controller is connected to the output of the pressure detector and is used to receive pressure signals;

[0012] A star-delta start circuit is connected to the output of the controller and to the input of the water pump to control the water pump to start or stop.

[0013] An electric valve, connected to the output of the controller, is used to control the flow of water and regulate its flow rate.

[0014] In the fire water pressure control system described above, preferably, at least one water pump and one electric valve are provided, with the water pump located at the beginning of a branch pipeline of the fire protection network, and the electric valve corresponding to the water pump.

[0015] In the fire water pressure control system described above, preferably, the controller controls the star-delta starting circuit to turn on the water pump and controls the electric valve to open from the initial opening position to the limit opening position according to the signal from the pressure detector.

[0016] In the fire water pressure control system described above, preferably, the controller controls the star-shaped start switch of the star-delta start circuit to open after a delay, while the delta start switch closes simultaneously. After the delta start switch closes and is delayed, the controller controls the electric valve to open from the initial opening position to the limit opening position.

[0017] In the fire water pressure control system described above, preferably, the controller further includes an alarm module, the input terminal of which is electrically connected to the output terminal of the controller.

[0018] In the fire water pressure control system described above, preferably, the alarm module is an audible and visual alarm.

[0019] In the fire water pressure control system described above, preferably, the controller is a Siemens S7-200 PLC controller.

[0020] In the fire water pressure control system described above, preferably, the fire water pressure control system further includes a pressure gauge, the input end of which is electrically connected to the output end of the pressure detector.

[0021] Compared with the prior art, this utility model uses a pressure detector to detect the pressure value in the main pipeline of the fire protection network in real time. When the fire protection network is activated and the pressure value increases, the controller automatically starts the water pump and adjusts the opening of the electric valve, thereby improving the response time of the fire pump. The water pump and the electric valve are linked, and the controller automatically adjusts the start and stop of the water pump according to the pressure value in the fire protection network, thus avoiding the energy consumption caused by the water pump being constantly running for 24 hours. Attached Figure Description

[0022] Figure 1 This is a block diagram of the fire-fighting water pressure control system provided in an embodiment of this utility model;

[0023] Figure 2 This is the main control circuit diagram of the fire water pressure control system provided in an embodiment of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Fire protection piping network; 2. Pressure detector; 3. Controller; 4. Star-delta start circuit; 5. Water pump; 6. Electric valve; 7. Alarm module; 8. Pressure gauge. Detailed Implementation

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] See Figure 1-2 As shown, this utility model provides a fire-fighting water pressure control system, including a water pump 5 and a fire-fighting pipe network 1, and also includes a pressure detector 2, a controller 3, a star-delta starting circuit 4, and an electric valve 6, wherein:

[0028] Pressure detector 2 is installed in the main pipeline of fire protection network 1 to detect the pressure signal in the main pipeline. The main pipeline directly reflects the water supply status of the water source, such as fire water tank, municipal pipeline, and water pump 5 to the entire system. Therefore, installing pressure detector 2 in the main pipeline can quickly detect water supply abnormalities and dynamically evaluate the performance of water pump 5. Compared with end-point detection, main pipeline monitoring can detect problems earlier.

[0029] The controller 3 is connected to the output of the pressure detector 2 to receive pressure signals. A preset pressure threshold is set. When the pressure value is ≤0.25MPa, it indicates that there is an abnormality in the water supply status of the fire protection pipeline 1, which may be caused by a malfunction of the water pump 5, a pipe rupture, or large-scale fire extinguishing water use. In this case, the controller 3 controls the water pump 5 to start, and the electric valve 6 takes corresponding actions. When the pressure value is ≥0.45MPa, it indicates that the water supply status of the fire protection pipeline 1 is normal. In this case, the controller 3 controls the water pump 5 to shut down to reduce power consumption, and the electric valve 6 takes corresponding actions to maintain a stable water supply status. Through the closed-loop control of the controller 3 and the pressure detector 2, the response time is shortened from the original 3-5 minutes of manual operation to within 10 seconds.

[0030] The star-delta starting circuit 4 is connected to the output of the controller 3 and to the input of the water pump 5, used to control the water pump 5 to start or stop. The star-delta starting circuit 4 can reduce the starting current, protect the equipment, and improve the reliability of automatic control by balancing starting performance and grid withstand capability through staged voltage reduction starting.

[0031] The electric valve 6 is connected to the output of the controller 3 and is used to control the water flow interruption and flow regulation. It can replace the traditional manual inspection and manual opening and closing mode. In case of fire, it can automatically open the valve to stabilize the pressure, greatly shortening the response time. In addition, the controller 3 can set the slow opening and slow closing time of the electric valve 6 to avoid sudden pressure changes in the pipeline caused by sudden full opening or full closing.

[0032] See Figure 2As shown, at least one water pump 5 and one electric valve 6 are provided. The water pump 5 is located at the beginning of the branch pipeline of the fire protection network 1, and the electric valve 6 is provided corresponding to the water pump 5.

[0033] Based on the signal from pressure detector 2, controller 3 controls the star-delta start circuit 4 to connect water pump 5 and controls electric valve 6 to open from the initial opening position to the maximum opening position. When the pressure value fed back by pressure detector 2 is within the normal range, water pump 5 shuts off to prevent energy waste. The valve of electric valve 6 is set to the initial opening position, and the opening can be set from 5-20% to maintain pressure balance in the pipeline. The pressure-holding standby mode reduces the average daily operating time of water pump 5 by 60%, saving approximately 8000 kWh of electricity per year.

[0034] See Figure 2 As shown, in this embodiment, the controller 3 controls the star-delta starter switch of the star-delta starter circuit 4 to open after a delay, while the delta starter switch closes simultaneously. After a delay following the closing of the delta starter switch, the controller 3 controls the electric valve 6 to open from its initial opening position to its maximum opening position. The staged control of the star-delta starter circuit 4 can reduce the motor starting current and prevent a sudden drop in grid voltage or equipment damage due to excessive inrush current. The star starter switch opens after a 10-second delay, and the delta starter switch closes. Furthermore, to avoid water hammer during the startup phase, the controller 3 controls the electric valve 6 to gradually open to its maximum opening position after a 10-second delay following the closing of the delta starter switch. This effectively prevents excessive system pressure fluctuations caused by high-speed water flow when suddenly opening a large-diameter valve. The coordinated control of the star-delta starter and the electric valve 6 reduces the burnout rate of the water pump 5 coil by 80%.

[0035] See Figure 1 As shown, the input terminal of the alarm module 7 is electrically connected to the output terminal of the controller 3. When an abnormality occurs in the control system, an alarm signal is issued through the alarm module 7. Abnormal signals include timeouts when the star-delta start switch and electric valve 6 are opened to their limit positions, electric valve 6 triggering an over-limit switch, or continuous abnormal pressure detection signals.

[0036] In this embodiment, the alarm module 7 is an audible and visual alarm. The controller 3 is a Siemens S7-200 PLC controller, and the pressure detector 2 is a piezoresistive pressure sensor with a range of 0-1.0 MPa and an accuracy of ±0.5%FS.

[0037] The fire water pressure control system also includes a pressure gauge 8, whose input terminal is electrically connected to the output terminal of the pressure detector 2.

[0038] This utility model can shorten the response time from 3-5 minutes to 10 seconds through the automatic control system, meeting the NFPA20 standard requirements. The peak starting current of the motor is reduced by 63%, the annual failure rate is reduced to 6%, the average daily running time of the water pump is reduced from 24 hours to 2.1 hours, the annual electricity saving is 8000 kWh, and the operation and maintenance costs are reduced, achieving unattended operation and reducing labor costs by 40%.

[0039] This embodiment uses two water pumps 5 and two electric valves 6 as an example to illustrate its circuit diagram:

[0040] Two water pumps 5 each have a water pump motor M1 and a water pump motor M2, and two electric valves 6 each have an electric valve motor M3 and an electric valve motor M4. The main circuit includes a circuit breaker Q1 and a fuse FQ1 connected in series. The normally open main contact of the main contactor KM is connected to the beginning of the three leads of the thermal relay FR1. The thermal relay FR1 is connected to the beginning of the three leads of the three-phase winding coil of the water pump motor M1. The end of the three leads of the three-phase winding coil of the water pump motor M1 is connected to the normally open main contact of the star contactor KM2. The normally open main contact of the delta contactor KM1 is connected between the beginning and end of the three leads of the three-phase winding coil of the water pump motor M1.

[0041] The normally open main contact of the main contactor KM3 is connected to the beginning of the three leads of the thermal relay FR2. The thermal relay FR2 is connected to the beginning of the three leads of the three-phase winding coil of the water pump motor M2. The end of the three leads of the three-phase winding coil of the water pump motor M2 is connected to the normally open main contact of the star contactor KM5. The normally open main contact of the delta contactor KM4 is connected between the beginning and end of the three leads of the three-phase winding coil of the water pump motor M2.

[0042] The coil of circuit breaker Q2 is connected to the beginning of the three leads of the normally open main contact coil of forward contactor KM6. The coil of the normally open main contact coil of forward contactor KM6 is connected to the beginning of the three leads of thermal relay FR3. Thermal relay FR3 is connected to the beginning of the three leads of the coil of electric valve motor M3. A reverse contactor KM7 is connected between the beginning and end of the three leads of the three-phase winding coil of forward contactor KM6. The beginning of the three leads of the three-phase winding coil of forward contactor KM6 is also connected to forward contactor KM8. The coil of the normally open main contact coil of forward contactor KM8 is connected to the beginning of the three leads of thermal relay FR4. Thermal relay FR4 is connected to the beginning of the three leads of the coil of electric valve motor M4. A reverse contactor KM9 is connected between the beginning and end of the three leads of the three-phase winding coil of forward contactor KM8.

[0043] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A fire-fighting water pressure control system, comprising a water pump and a fire-fighting pipe network, characterized in that, Also includes: A pressure detector is installed inside the main pipeline of the fire protection network to detect the pressure signal inside the main pipeline; The controller is connected to the output of the pressure detector and is used to receive pressure signals; A star-delta start circuit is connected to the output of the controller and to the input of the water pump to control the water pump to start or stop. An electric valve, connected to the output of the controller, is used to control the flow of water and regulate its flow rate.

2. The fire-fighting water pressure control system according to claim 1, characterized in that, The water pump and the electric valve are both provided at least once. The water pump is located at the beginning of the branch pipeline of the fire protection network, and the electric valve is provided corresponding to the water pump.

3. The fire-fighting water pressure control system according to claim 1, characterized in that, The controller, based on the signal from the pressure detector, controls the star-delta start circuit to turn on the water pump and controls the electric valve to open from the initial opening position to the limit opening position.

4. The fire-fighting water pressure control system according to claim 1, characterized in that, The controller controls the star-shaped start switch of the star-delta start circuit to open after a delay, while the delta start switch closes simultaneously. After a delay, the controller controls the electric valve to open from the initial opening position to the limit opening position.

5. The fire-fighting water pressure control system according to claim 1, characterized in that, The controller also includes an alarm module, the input of which is electrically connected to the output of the controller.

6. The fire-fighting water pressure control system according to claim 5, characterized in that, The alarm module is an audible and visual alarm.

7. The fire-fighting water pressure control system according to claim 1, characterized in that, The controller is a Siemens S7-200 PLC controller.

8. The fire-fighting water pressure control system according to claim 1, characterized in that, The fire water pressure control system also includes a pressure gauge, the input of which is electrically connected to the output of the pressure detector.

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