Fire-fighting pipe network water pressure alarm system

Abstract

The utility model provides a fire-fighting pipe network water pressure alarm system, which comprises a first booster pump, an electric contact pressure gauge, a main control circuit, a delay alarm circuit and a power supply, and is characterized in that when the water pressure of a fire-fighting pipe network is lower than the lower pressure limit, the electric contact pressure gauge connects the power supply circuits of the first booster pump and the delay alarm circuit, and the first booster pump starts to work; and meanwhile, the first time relay starts timing, the action is executed only when the timing of the first time relay reaches the first time, and the alarm device is electrified and sends an alarm signal. When the water pressure of the fire-fighting pipe network reaches the pressure upper limit and the first time relay does not time the first time, the electric contact pressure gauge disconnects the power supply circuit of the first booster pump and the time-delay alarm circuit, the first booster pump stops working, the first time relay is powered off and stops timing, the alarm device is not powered on, and then an alarm signal is not sent out. Therefore, the alarm is not given during normal water replenishing and pressurization, and the alarm is only given when the abnormal water leakage condition exists in the fire-fighting pipe network.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire-fighting pipe network water pressure monitoring, in particular to a fire-fighting pipe network water pressure alarm system. BACKGROUND

[0002] The fire-fighting pipe network is composed of a complex pipe system, so there is a leakage in daily use, and the water pressure in the fire-fighting pipe network will continue to drop, so a pressure stabilizing system is arranged in the fire-fighting system to monitor the water pressure of the fire-fighting pipe network in real time and control the booster pressure stabilizing pump to supplement water to the fire-fighting pipe network. In the existing fire-fighting pipe network pressure stabilizing system, the booster pressure stabilizing pump does not send an alarm signal when it starts working, and once the fire-fighting pipe network has an abnormal leakage such as pipe explosion, it cannot be found in time, which causes the fire-fighting system to be unable to provide sufficient water source when a fire occurs, and there is a safety hazard. CONTENT OF THE UTILITY MODEL

[0003] To solve the above technical problems, the present application provides a fire-fighting pipe network water pressure alarm system, characterized in that it comprises a first booster pump, an electric contact pressure gauge, a main control circuit, a delay alarm circuit and a power supply. The first booster pump is used for boosting water supply to the fire-fighting pipe network. The electric contact pressure gauge has a lower limit switch and an upper limit switch, the first end of the lower limit switch is connected with the main control circuit, the second end and the first end of the upper limit switch are connected in series, and the second end of the upper limit switch is connected with the power supply.

[0004] The main control circuit comprises a first intermediate relay and a first AC contactor, the first intermediate relay has at least a first normally open switch, a second normally open switch and a third normally open switch, the first AC contactor has at least a fourth normally open switch, the first end of the coil of the first intermediate relay is connected with the first end of the lower limit switch in series, the second end is connected with the power supply, the first normally open switch is connected with the lower limit switch in parallel, the first end of the second normally open switch is connected with the first end of the coil of the first AC contactor in series, the second end is connected with the power supply, the second end of the coil of the first AC contactor is connected with the power supply, the first end of the third normally open switch is connected with the delay alarm circuit in series, the second end is connected with the power supply, the first end of the fourth normally open switch is connected with the power supply, and the second end is connected with the first booster pump in series.

[0005] The delay alarm circuit comprises a first time relay and an alarm device, the first time relay has a fifth normally open switch, the first end of the coil of the first time relay is connected with the first end of the third normally open switch in series, the other end is connected with the power supply, the first end of the fifth normally open switch is connected with the first end of the alarm device in series, the second end is connected with the power supply, the second end of the alarm device is connected with the power supply, and the alarm device can send an alarm signal after being powered on.

[0006] When the water pressure of the fire pipe network is lower than the lower limit of the pressure, the lower limit switch of the electric contact pressure gauge is closed, the coil of the first intermediate relay is energized, the first, second and third normally open switches are all closed, the coil of the first AC contactor is energized, the fourth normally open switch is closed, the power supply circuit of the first booster pump is connected, and the first booster pump starts to work. At the same time, the coil of the first time relay is energized, the first time relay starts to count, and the fifth normally open switch is closed after the first time relay counts to the first preset time, the circuit of the alarm device is connected, and the alarm device sends an alarm signal to prompt the manager that the pressure of the fire pipe network does not reach the specified pressure value on time, and the fire pipe network may have an abnormal water leakage phenomenon.

[0007] When the water pressure of the fire pipe network has reached the upper limit of the pressure and the first time relay has not counted to the first preset time, the upper limit switch is opened, the coil of the first intermediate relay is de-energized, the first, second and third normally open switches are all opened, the coil of the first AC contactor is de-energized, the fourth normally open switch is opened, the first booster pump is de-energized and stops working. At the same time, the coil of the first time relay is de-energized and stops counting, and the fifth normally open switch is not closed, so that the alarm device is not energized and does not send an alarm signal, thereby avoiding the alarm when the first booster pump normally supplies water to the fire pipe network, avoiding the misjudgment of the manager on the state of the fire pipe network, and reducing the working intensity of the manager.

[0008] In some embodiments, the fire pipe network water pressure alarm system further comprises a second booster pump for boosting water supply to the fire pipe network. The main control circuit further comprises a second time relay, a second intermediate relay and a second AC contactor which are electrically connected to each other, and the main control circuit can control the on-off of the second booster pump. When the first booster pump fails to work, the second booster pump can continue to supply water to the fire pipe network, thereby improving the reliability of the entire fire pipe network through the redundant design.

[0009] In some embodiments, the main control circuit further comprises a changeover switch which can be switched between a first state and a second state. In the first state, the first booster pump is first energized, and the second booster pump is energized after the first booster pump is de-energized. In the second state, the second booster pump is first energized, and the first booster pump is energized after the second booster pump is de-energized. Since there is normal water leakage in the fire pipe network, the first booster pump will be frequently started, and its performance will decrease after long-term use. By setting the second booster pump to start first through the changeover switch, the use frequency of the first booster pump can be reduced, and the service life of the first booster pump can be improved.

[0010] Further, the switcher can further switch among the first state, the second state and a third state, wherein in the third state, the main control circuit can manually control the power on / off of the first booster pump and the second booster pump. When the main control circuit fails to automatically start the first booster pump and the second booster pump, the first booster pump and the second booster pump can be started by manually turning on the power supply circuit.

[0011] In some embodiments, the main control circuit further comprises a first thermal overload relay and a second thermal overload relay. The first thermal overload relay is used to disconnect the first booster pump from the power supply when the first booster pump is overloaded, and the second thermal overload relay is used to disconnect the second booster pump from the power supply when the second booster pump is overloaded. The temperature of the booster pump will continuously rise when it is working, and when it exceeds the designed upper limit of temperature, it will cause damage to the booster pump. The thermal overload relay can effectively prevent the booster pump from being overloaded.

[0012] In some embodiments, the main control circuit further comprises a first booster pump indicator and a second booster pump indicator. The first booster pump indicator is used to display the working state of the first booster pump, and the second booster pump indicator is used to display the working state of the second booster pump.

[0013] In some embodiments, the alarm device comprises a fault indicator, one end of which is connected to the power supply and the other end of which is connected to the fifth normally open switch. When the pressure of the fire pipe network does not reach the specified upper limit value after the booster pump has been working for a certain period of time, the fault indicator lights up, prompting the administrator that there is an abnormal water leakage in the fire pipe network.

[0014] In some embodiments, the alarm device comprises an input module and a fire host, the input end of the input module is connected in series with the fifth normally open switch, and the bus end of the input module is connected to the fire host. The input module is an electrical component commonly used in fire monitoring and control systems, which can convert the switch quantity signal in the circuit into a preset control instruction signal and transmit it to the fire host, so that the fire host can display the corresponding fault information according to the control signal.

[0015] In some embodiments, the alarm device further comprises a graphic display, which is connected to the fire host and is used to display alarm information. The graphic display is flexible to install and can display the working state of all devices in the entire fire system, facilitating the administrator to monitor the operation of each device in the fire system.

[0016] In some embodiments, a control cabinet is further included, and the main control circuit is installed in the control cabinet. The control cabinet can well protect various electrical components and cables and isolate them from personnel, improving safety.

[0017] The application provides a fire-fighting pipe network water pressure alarm system, which comprises a first booster pump, an electric contact pressure gauge, a main control circuit, a delay alarm circuit and a power supply. When the water pressure of the fire-fighting pipe network is lower than the lower limit of pressure, the electric contact pressure gauge connects the power supply circuit of the first booster pump and the delay alarm circuit, the first booster pump starts to work, and at the same time, the first time relay starts to time. When the first time relay times to the first time, the alarm device is powered on and sends an alarm signal. When the water pressure of the fire-fighting pipe network has reached the upper limit of pressure and the first time relay has not timed to the first time, the electric contact pressure gauge disconnects the power supply circuit of the first booster pump and the delay alarm circuit, the first booster pump stops working, the first time relay is powered off and stops timing, and the alarm device is not powered on, thereby not sending an alarm signal. Thus, the alarm is not sent during normal water replenishment and pressurization, and the alarm is sent only when there is an abnormal water leakage in the fire-fighting pipe network. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0019] Figure 1 is the electrical schematic diagram of the first embodiment of the application;

[0020] Figure 2 is the wiring diagram of the first booster pump in the first embodiment of the application;

[0021] Figure 3 is the electrical schematic diagram of the second embodiment of the application;

[0022] Figure 4 is the electrical schematic diagram of the first booster pump control loop of the main control circuit in the second embodiment of the application;

[0023] Figure 5 is the electrical schematic diagram of the second booster pump control loop of the main control circuit in the second embodiment of the application;

[0024] Figure 6 is the wiring diagram of the first booster pump in the second embodiment of the application;

[0025] Figure 7 is the wiring diagram of the second booster pump in the second embodiment of the application. DETAILED DESCRIPTION

[0026] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other alternative embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0027] Figure 1 and Figure 2 The first embodiment of the present application is shown, and a fire-fighting pipe network water pressure alarm system is provided, which comprises a first booster pump M1, an electric contact pressure gauge, a main control circuit S01, a delay alarm circuit S02, and a power supply S00. The first booster pump M1 is used to provide booster water supply for the fire-fighting pipe network. The electric contact pressure gauge has a lower limit switch P2 and an upper limit switch P1, the first end of the lower limit switch P2 is connected with the main control circuit S01, the second end and the first end of the upper limit switch P1 are connected in series, and the second end of the upper limit switch P1 is electrically connected with the power supply S00.

[0028] The main control circuit S01 comprises a first intermediate relay 1KA and a first alternating current contactor AKM, the first intermediate relay 1KA has at least a first normally open switch 1KA1, a second normally open switch 1KA2, and a third normally open switch 1KA3, and the first alternating current contactor AKM has at least a fourth normally open switch AKM1, the first end of the coil of the first intermediate relay 1KA is connected with the first end of the lower limit switch P2 in series, the second end is electrically connected with the power supply S00, the first normally open switch 1KA1 is connected with the lower limit switch P2 in parallel, the first end of the second normally open switch 1KA2 is connected with the first end of the coil of the first alternating current contactor AKM in series, the second end is electrically connected with the power supply S00, the second end of the coil of the first alternating current contactor AKM is electrically connected with the power supply S00, the first end of the third normally open switch 1KA3 is connected with the delay alarm circuit S02 in series, the second end is connected with the power supply S00, the first end of the fourth normally open switch AKM1 is electrically connected with the power supply S00, and the second end is connected with the first booster pump M1 in series.

[0029] The delay alarm circuit S02 comprises a first time relay 1KT and an alarm device, the first time relay 1KT has a fifth normally open switch 1KT1, the first end of the coil of the first time relay 1KT is connected with the first end of the third normally open switch 1KA3 in series, the other end is electrically connected with the power supply S00, the first end of the fifth normally open switch 1KT1 is connected with the first end of the alarm device in series, the second end is electrically connected with the power supply S00, the second end of the alarm device is electrically connected with the power supply S00, and the alarm device can emit an alarm signal after being powered on.

[0030] When the water pressure of the fire pipe network is lower than the lower limit of the pressure, the lower limit switch P2 of the electric contact pressure gauge is closed, the coil of the first intermediate relay 1KA is energized, the first normally open switch 1KA1, the second normally open switch 1KA2 and the third normally open switch 1KA3 are all closed, the coil of the first alternating current contactor AKM is energized, the fourth normally open switch AKM1 is closed, the power supply circuit of the first booster pump M1 is turned on, and the first booster pump M1 starts to work. At the same time, the coil of the first time relay 1KT is energized, the first time relay 1KT starts to count, and the fifth normally open switch 1KT1 is closed after the first time relay 1KT counts to the first preset time, the circuit of the alarm device is turned on, and the alarm device sends an alarm signal to prompt the manager that the pressure of the fire pipe network does not reach the specified pressure value in time, and the fire pipe network may have an abnormal water leakage phenomenon.

[0031] When the water pressure of the fire pipe network has reached the upper limit of the pressure and the first time relay 1KT has not counted to the first preset time, the upper limit switch P1 is opened, the coil of the first intermediate relay 1KA is de-energized, the first normally open switch 1KA1, the second normally open switch 1KA2 and the third normally open switch 1KA3 are all opened, the coil of the first alternating current contactor AKM is de-energized, the fourth normally open switch AKM1 is opened, and the first booster pump M1 is de-energized and stops working. At the same time, the coil of the first time relay 1KT is de-energized and stops counting, the fifth normally open switch 1KT1 is not closed, the alarm device is not energized, and no alarm signal is sent, thereby avoiding the alarm when the first booster pump M1 normally supplies water to the fire pipe network, avoiding the misjudgment of the manager on the state of the fire pipe network, and reducing the working intensity of the manager.

[0032] The alarm device in the present application can include various devices, for example, in the first embodiment of the present application, as shown in Figure 3 When the pressure of the fire pipe network does not reach the specified upper limit value after the booster pump works for a certain time, the first time relay 1KT counts to the first predetermined time (for example, 180s), at which time the coil acts, the fifth normally open switch 1KT1 is closed, the fault indicator lamp 3HR is energized and lit, and the manager is prompted that the fire pipe network has an abnormal water leakage situation.

[0033] Figures 3 to 7The second embodiment of the application is shown, on the basis of the first embodiment, the fire pipe network water pressure alarm system provided by the application further comprises a second booster pump M2 for boosting water supply to the fire pipe network. The main control circuit S01 further comprises a second time relay 2KT, a second intermediate relay 2KA and a second AC contactor BKM which are electrically connected to each other, and the main control circuit S01 can control the on-off of the second booster pump M2. When the first booster pump M1 fails to work, the second booster pump M2 can continue to boost water supply to the fire pipe network, thereby improving the reliability of the entire fire pipe network through the redundant design.

[0034] Specifically, the second time relay 2KT has a sixth normally open switch 2KT1, and the second intermediate relay 2KA has at least a first normally closed switch 2KA1, a second normally closed switch 2KA3, a seventh normally open switch 2KA2, an eighth normally open switch 2KA4 and a ninth normally open switch 2KA5. The first AC contactor AKM further has a third normally closed switch AKM2, and the second AC contactor BKM has a tenth normally open switch BKM1. As shown in Figure 3 the coil of the second time relay 2KT, the first normally closed switch 2KA1 and the third normally closed switch AKM2 are connected in series with each other and are all connected in parallel with the coil of the first intermediate relay 1KA. The sixth normally open switch 2KT1 and the coil of the second intermediate relay 2KA are connected in series with each other and are all connected in parallel with the coil of the first intermediate relay 1KA, and the seventh normally open switch 2KA2 is connected in parallel with the sixth normally open switch 2KT1. The ninth normally open switch 2KA5 is connected in series between the third normally open switch 1KA3 and the coil of the first time relay 1KT. As shown in Figure 4 the second normally closed switch 2KA3 is connected in series between the second normally open switch 1KA2 and the coil of the first AC contactor AKM. As shown in Figure 5 the first end of the eighth normally open switch 2KA4 is connected in series with the coil of the second AC contactor BKM, the second end is electrically connected to the power supply S00, and the first end of the coil of the second AC contactor BKM is electrically connected to the power supply S00. As shown in Figure 7 the tenth normally open switch BKM1 has one end electrically connected to the power supply S00 and the other end electrically connected to the second booster pump M2.

[0035] When the first booster pump M1 fails, the coil of the first AC contactor AKM is de-energized, the fourth normally open switch AKM1 is opened, the third normally closed switch AKM2 is closed, the coil of the second time relay 2KT is energized and starts timing, when the timing reaches the second predetermined time (for example, set to 60s), the coil of the first AC contactor AKM is still not energized, then the sixth normally open switch 2KT1 is closed, the coil of the second intermediate relay 2KA is energized, the seventh normally open switch 2KA2 is closed, the eighth normally open switch 2KA4 is closed, the coil of the second AC contactor BKM is energized, the tenth normally open switch BKM1 is closed, the second booster pump M2 is energized and starts working. The ninth normally open switch 2KA5 is closed, the coil of the first time relay 1KT is energized and starts timing.

[0036] Further, in the second embodiment, the main control circuit S01 further comprises a switching switch, which can be switched between a first state and a second state, wherein in the first state, the first booster pump M1 is energized first, and the second booster pump M2 is energized after the first booster pump M1 is de-energized, and in the second state, the second booster pump M2 is energized first, and the first booster pump M1 is energized after the second booster pump M2 is de-energized. Since there is normal water leakage in the fire pipe network, the first booster pump M1 will be frequently started, and its performance will decrease after long-term use. By setting the second booster pump M2 to start first through the switching switch, the use frequency of the first booster pump M1 can be reduced, and the service life of the first booster pump M1 can be improved.

[0037] Specifically, as shown in Figure 3 the switching switch has at least a first contact switch SA1, a second contact switch SA2, a third contact switch SA3, a fourth contact switch SA4, a fifth contact switch SA5, and a sixth contact switch SA6, the second AC contactor BKM further has a fourth normally closed switch BKM2, the second intermediate relay 2KA further includes an eleventh normally open switch 2KA6 and a fifth normally closed switch 2KA7, and the first intermediate relay 1KA further includes a twelfth normally open switch 1KA4. The first end of the first contact switch SA1 is electrically connected with the third normally closed switch AKM2, and the second end is connected in series with the first normally open switch 1KA1. The first end of the second contact switch SA2 is electrically connected with the fourth normally closed switch BKM2, and the second end is connected with the first end of the first contact switch SA1.

[0038] As shown in Figure 4 the first end of the third contact switch SA3 is electrically connected with the second normally open switch 1KA2, and the second end is connected with the power supply S00. The first end of the fourth contact switch SA4 is electrically connected with the first end of the eleventh normally open switch 2KA6, and the second end is electrically connected with the power supply S00, and the second end of the eleventh normally open switch 2KA6 is connected in series with the first end of the coil of the first AC contactor AKM.

[0039] As shown in Figure 5As shown, the first end of the fifth contact switch SA5 is connected with the first end of the twelfth normally open switch 1KA4, the second end is connected with the power supply S00, the second end of the twelfth normally open switch 1KA4 is connected with the eighth normally open switch 2KA4 in series. The first end of the sixth contact switch SA6 is connected with the eighth normally open switch 2KA4, the other end is connected with the power supply S00, the other end of the fifth normally closed switch 2KA7 is connected with the coil of the second AC contactor BKM in series.

[0040] When the switch is in the first state, the first contact switch SA1, the second contact switch SA2 and the third contact switch SA3 are all closed, the fourth contact switch SA4, the fifth contact switch SA5 and the sixth contact switch SA6 are all open. When the lower limit switch P2 is closed, the coil of the first intermediate relay 1KA is energized, the second normally open switch 1KA2 is closed, the coil of the first AC contactor AKM is energized, the fourth normally open switch AKM1 is closed, the first booster pump M1 is energized. The third normally closed switch AKM2 is open, the coil of the second time relay 2KT is not energized, and the timing does not start. The sixth normally open switch 2KT1 is not closed, the coil of the second intermediate relay 2KA is not energized, the eighth normally open switch 2KA4 is not closed, the coil of the second AC contactor BKM is not energized, the tenth normally open switch BKM1 is not closed, and the second booster pump M2 is not energized. When the coil of the first AC contactor AKM is de-energized, the third normally closed switch AKM2 is closed, the coil of the second time relay 2KT is energized and starts timing, when the timing reaches the predetermined time (for example, 60s), the coil starts to act, the sixth normally open switch 2KT1 is closed, the coil of the second intermediate relay 2KA is energized, the eighth normally open switch 2KA4 is closed, the coil of the second AC contactor BKM is energized, the tenth normally open switch BKM1 is closed, and the second booster pump M2 is energized. At the same time, the second normally closed switch 2KA3 is open, which ensures that the coil of the first AC contactor AKM will not be energized, and facilitates the maintenance personnel to overhaul the first booster pump M1.

[0041] When the switch is in the second state, the first contact switch SA1, the second contact switch SA2 and the third contact switch SA3 are all open, and the fourth contact switch SA4, the fifth contact switch SA5 and the sixth contact switch SA6 are all closed. When the lower limit switch P2 is closed, the coil of the first intermediate relay 1KA is energized, the second normally open switch 1KA2 is closed, but the coil of the first alternating current contactor AKM is not energized because the third contact switch SA3 is open. The twelfth normally open switch 1KA4 is closed, the coil of the second alternating current contactor BKM is energized, the tenth normally open switch BKM1 is closed, and the second booster pump M2 is energized. The fourth normally closed switch BKM2 is open, the coil of the second time relay 2KT is not energized and does not start timing. When the coil of the second alternating current contactor BKM is de-energized, the fourth normally closed switch BKM2 is closed, the coil of the second time relay 2KT is energized and starts timing, and when the timing reaches a predetermined time (for example, 60s), the coil starts to act, the sixth normally open switch 2KT1 is closed, the coil of the second intermediate relay 2KA is energized, the eleventh normally open switch 2KA6 is closed, the coil of the first alternating current contactor AKM is energized, the fourth normally open switch AKM1 is closed, and the first booster pump M1 is energized. At the same time, the fifth normally closed switch 2KA7 is open, ensuring that the coil of the second alternating current contactor BKM is in a de-energized state, facilitating maintenance of the second booster pump M2 by the management personnel.

[0042] Further, the switch can also switch between the first state, the second state and a third state, wherein in the third state, the main control circuit S01 can manually control the on-off of the first booster pump M1 and the second booster pump M2. When the main control circuit S01 fails to automatically start the first booster pump M1 and the second booster pump M2, the power supply circuit of the first booster pump M1 and the second booster pump M2 can be manually turned on to start, so as to provide water pressure for the fire pipe network.

[0043] Specifically, as shown in Figures 3 to 5 the main control circuit S01 further includes a first start switch AST, a first stop switch ASTP, a second start switch BST and a second stop switch BSTP. The switch further has a seventh contact switch SA7 and an eighth contact switch SA8, the first alternating current contactor AKM further has a thirteenth normally open switch AKM3, and the second alternating current contactor BKM further has a fourteenth normally open switch BKM3.

[0044] The first end of the seventh contact switch SA7 is connected with the power supply S00, the second end is connected with the first stop switch ASTP in series, the second end of the first stop switch ASTP is connected with the first end of the first start switch AST in series, the second end of the first start switch AST is connected with the first end of the coil of the first alternating current contactor AKM in series, and the thirteenth normally open switch AKM3 is connected with the first start switch AST in parallel.

[0045] The first end of the eighth contact switch SA8 is connected with the power supply S00, and the second end is connected with the first end of the second stop switch BSTP. The second end of the second stop switch BSTP is connected in series with the first end of the second start switch BST. The second end of the second start switch BST is connected in series with the first end of the coil of the second alternating current contactor BKM. The fourteenth always-on switch BKM3 is connected in parallel with the second start switch BST.

[0046] When the conversion switch is in the third state, the first contact switch SA1, the second contact switch SA2, the third contact switch SA3, the fourth contact switch SA4, the fifth contact switch SA5 and the sixth contact switch SA6 are all open, and the seventh contact switch SA7 and the eighth contact switch SA8 are both closed. When the first start switch AST is closed, the coil of the first alternating current contactor AKM is energized. When the first stop switch ASTP is open, the coil of the first alternating current contactor AKM is de-energized. Similarly, when the second start switch BST is closed, the coil of the second alternating current contactor BKM is energized. When the second stop switch BSTP is open, the coil of the second alternating current contactor BKM is de-energized.

[0047] As a further improvement, the master control circuit S01 further comprises a first thermal overload relay 1KH and a second thermal overload relay 2KH. The first thermal overload relay 1KH is used to disconnect the first booster pump M1 from the power supply S00 when the first booster pump M1 is overloaded, and the second thermal overload relay 2KH is used to disconnect the second booster pump M2 from the power supply S00 when the second booster pump M2 is overloaded. The temperature of the booster pump will continuously rise when it is working, and if it exceeds the designed upper limit of temperature, it will cause damage to the booster pump. The thermal overload relay can effectively prevent the booster pump from being overloaded.

[0048] Specifically, as shown in Figure 4 and Figure 6 The first thermal overload relay 1KH has at least a sixth always-closed switch 1KH1. The thermal element of the first thermal overload relay 1KH is connected in series between the first booster pump M1 and the fourth always-on switch AKM1. The first end of the sixth always-closed switch 1KH1 is connected with the first end of the coil of the first alternating current contactor AKM. The second end is connected with the second end of the eleventh always-on switch 2KA6, the second end of the first start switch AST and the first end of the second always-closed switch 2KA3. The thermal element of the first thermal overload relay 1KH will heat up when energized. When the temperature rises to a certain value, the sixth always-closed switch 1KH1 is open, cutting off the circuit of the first alternating current contactor AKM, achieving the purpose of protecting the first booster pump M1.

[0049] As shown in Figure 5 and Figure 7As shown, the second thermal overload relay 2KH has at least a seventh normally closed switch 2KH1, a thermal element of the second thermal overload relay 2KH is connected in series between the second booster pump M2 and the tenth normally open switch BKM1, a first end of the seventh normally closed switch 2KH1 is connected with a first end of the coil of the second alternating current contactor BKM, a second end is connected with a second end of the eighth normally open switch 2KA4, a second end of the seventh normally closed switch 2KH1, and a second end of the fifth normally closed switch 2KA7. The working principle of the second thermal overload relay 2KH is the same as that of the first thermal overload relay 1KH.

[0050] Further, in the second embodiment of the present application, as shown in Figure 4 and Figure 5 As shown, the main control circuit S01 further comprises a first booster pump indicator lamp AHR and a second booster pump indicator lamp BHR, the first booster pump indicator lamp AHR is used to display the working state of the first booster pump M1, and the second booster pump indicator lamp BHR is used to display the working state of the second booster pump M2.

[0051] Specifically, the first alternating current contactor AKM further has a fifteenth normally open switch AKM4, and the second alternating current contactor BKM further has a sixteenth normally open switch BKM4. A first end of the first booster pump indicator lamp AHR is connected in series with a first end of the fifteenth normally open switch AKM4, a second end is connected with the power supply S00, and a second end of the fifteenth normally open switch AKM4 is connected with the power supply S00. A first end of the second booster pump indicator lamp BHR is connected in series with a first end of the sixteenth normally open switch BKM4, a second end is connected with the power supply S00, and a second end of the sixteenth normally open switch BKM4 is connected with the power supply S00.

[0052] When the coil of the first alternating current contactor AKM is powered, the fifteenth normally open switch AKM4 is closed, the first booster pump indicator lamp AHR is powered, and it is indicated that the first booster pump starts to work. When the coil of the second alternating current contactor BKM is powered, the sixteenth normally open switch BKM4 is closed, the second booster pump indicator lamp BHR is powered, and it is indicated that the second booster pump starts to work.

[0053] In the second embodiment of the present application, as shown in Figure 3 As shown, the alarm device comprises an input module S03 and a fire control host S04, an input end of the input module S03 is connected in series with the fifth normally open switch 1KT1, and a bus end of the input module S03 is connected with the fire control host S04. The input module S03 is an electrical element commonly used in the fire control monitoring and control system, which can convert the on-off signal in the circuit into a preset control instruction signal and transmit it to the fire control host S04, so that the fire control host S04 can display the corresponding fault information according to the control signal.

[0054] Specifically, the input module S03 can adopt a Siemens FDCI181S input module S03. When the fifth normally open switch 1KT1 is closed, the input module S03 receives a switch signal and transmits a preset control instruction to the fire host S04. The fire host S04 displays corresponding fault information according to the received control instruction.

[0055] Further, in the second embodiment of the present application, as shown in Figure 3 The alarm device further includes a graphic display S05 electrically connected with the fire host S04, and the graphic display S05 is used to display alarm information. The graphic display S05 is flexible to install and can display the working states of all devices in the entire fire protection system, which is convenient for the management personnel to monitor the operation of each device in the fire protection system.

[0056] Further, in the second embodiment of the present application, a control cabinet is further included, and the main control circuit S01 is installed in the control cabinet. The control cabinet can well protect various electrical components and cables and is isolated from personnel, thereby improving safety.

[0057] Finally, it should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0058] In addition, if the present application embodiments involve descriptions of "first", "second", etc., the "first", "second", etc. descriptions are only for description purposes and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled personnel in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

[0059] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the contents of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A fire service network water pressure alarm system, characterised in that, The system comprises a first booster pump, an electric contact pressure gauge, a main control circuit, a delay alarm circuit and a power supply; The first booster pump is used for boosting water supply of the fire-fighting pipe network; The electric contact pressure gauge has a lower limit switch and an upper limit switch, a first end of the lower limit switch is connected with the main control circuit, a second end of the lower limit switch and a first end of the upper limit switch are connected in series, and a second end of the upper limit switch is connected with the power supply; The main control circuit comprises a first intermediate relay and a first AC contactor, the first intermediate relay has at least a first normally open switch, a second normally open switch and a third normally open switch, the first AC contactor has at least a fourth normally open switch, a first end of a coil of the first intermediate relay is connected with the first end of the lower limit switch in series, a second end of the coil of the first intermediate relay is connected with the power supply, the first normally open switch is connected with the lower limit switch in parallel, a first end of the second normally open switch is connected with a first end of a coil of the first AC contactor in series, a second end of the second normally open switch is connected with the power supply, a second end of the coil of the first AC contactor is connected with the power supply, a first end of the third normally open switch is connected with the delay alarm circuit in series, a second end of the third normally open switch is connected with the power supply, a first end of the fourth normally open switch is connected with the power supply, and a second end of the fourth normally open switch is connected with the first booster pump in series; The delay alarm circuit comprises a first time relay and an alarm device, the first time relay has a fifth normally open switch, a first end of a coil of the first time relay is connected with the first end of the third normally open switch in series, another end of the coil of the first time relay is connected with the power supply, a first end of the fifth normally open switch is connected with a first end of the alarm device in series, a second end of the fifth normally open switch is connected with the power supply, a second end of the alarm device is connected with the power supply, and the alarm device can send an alarm signal after being powered on.

2. A fire service pipe network water pressure alarm system according to claim 1 characterised in that, The fire-fighting pipe network water pressure alarm system further comprises a second booster pump, and the second booster pump is used for boosting water supply of the fire-fighting pipe network; The main control circuit further comprises a second time relay, a second intermediate relay and a second AC contactor which are connected with each other, and the main control circuit can control on-off of the second booster pump.

3. A fire service pipework water pressure alarm system according to claim 2, characterised in that, The main control circuit further comprises a change-over switch, the change-over switch can be switched between a first state and a second state, in the first state, the first booster pump is powered on first, and the second booster pump is powered on after the first booster pump is powered off, in the second state, the second booster pump is powered on first, and the first booster pump is powered on after the second booster pump is powered off.

4. A fire service pipework water pressure alarm system according to claim 3, characterised in that, The change-over switch can be further switched between the first state, the second state and a third state, in the third state, the main control circuit can manually control on-off of the first booster pump and the second booster pump.

5. A fire service pipework water pressure alarm system according to claim 4, wherein, The main control circuit further comprises a first thermal overload relay and a second thermal overload relay; The first thermal overload relay is used for disconnecting the first booster pump from the power supply when the first booster pump is overloaded, and the second thermal overload relay is used for disconnecting the second booster pump from the power supply when the second booster pump is overloaded.

6. A fire service pipework water pressure alarm system according to claim 5, wherein, The master control circuit further comprises a first booster pump indicator lamp and a second booster pump indicator lamp, the first booster pump indicator lamp being used for displaying the working state of the first booster pump, and the second booster pump indicator lamp being used for displaying the working state of the second booster pump.

7. A fire main water pressure alarm system according to any one of claims 1 to 6, characterised in that, The alarm device comprises a fault indicator lamp, one end of which is connected with the power supply and the other end of which is connected with the fifth normally open switch.

8. A fire service pipework water pressure alarm system according to any one of claims 1 to 6, characterised in that, The alarm device comprises an input module and a fire-fighting host, an input end of the input module being connected in series with the fifth normally open switch, and a bus end of the input module being electrically connected with the fire-fighting host.

9. A fire service hydrant water pressure alarm system according to claim 8, characterised in that, The alarm device further comprises a graphic display, which is electrically connected with the fire-fighting host and is used for displaying alarm information.

10. A fire service pipework water pressure alarm system according to any one of claims 1 to 6, characterised in that, The fire-fighting pipe network water pressure alarm system further comprises a control cabinet, and the master control circuit is installed in the control cabinet.

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