Intelligent starting control method for high-power fire-fighting water supply pump

Abstract

The application relates to the technical field of high-power water pumps and discloses an intelligent starting control method for a high-power fire-fighting water supply pump, which comprises the following steps: an electric actuator is installed on a butterfly valve of an original fire-fighting water supply pump outlet pipeline, and a fire-fighting water supply pump control circuit is reformed; when the pressure of a fire-fighting water pipe network is less than or equal to 0.3 Mpa, a 1# fire-fighting water supply pump is a main pump, and a 2# fire-fighting water supply pump is a standby pump, the electric actuator first closes a butterfly valve V02, the 1# fire-fighting water supply pump is automatically started, then the butterfly valve V02 is opened, and water is supplied to the fire-fighting water pipe network; when the 2# fire-fighting water supply pump is the main pump and the 1# fire-fighting water supply pump is the standby pump, the electric actuator first closes a butterfly valve V05, the 2# fire-fighting water supply pump is automatically started, then the butterfly valve V05 is opened, and water is supplied to the fire-fighting water pipe network. The application does not need to install a frequency converter on the fire-fighting water supply pump, so that the problem of starting under load of the fire-fighting water supply pump is solved, the starting current of the fire-fighting water supply pump is reduced, and the application is suitable for starting control of a 200KW and above fire-fighting water supply pump.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-power water pumps, and in particular relates to an intelligent starting control method for a high-power fire-fighting water pump. Background Art

[0002] The fire water pump is a vital piece of equipment for fire safety and a necessary firefighting facility for most medium- to large-scale chemical companies. Its primary function is to quickly provide sufficient water pressure and flow to the fire water system in the event of a fire, ensuring timely and effective firefighting efforts. The existing company's fire pump system features two fire water pumps (one in operation and one in standby), each with a water supply capacity of Q = 158L / S, H = 110m, and P = 250KW. A high-pressure stabilization device is also included. The inlet pipelines of the two fire water supply pumps are each equipped with a DN300 gate valve V01 and gate valve V04, and the outlet pipelines are each equipped with a DN300 multi-function valve V28 and multi-function valve V29, a DN300 butterfly valve V02 and butterfly valve V05, and a DN100 gate valve V03 and gate valve V06. The main function of the multi-function valve V28 and multi-function valve V29 is to automatically slow open, slow close, and check the valve by utilizing the water pressure difference. The main function of the butterfly valve V02 and butterfly valve V05 is to effectively isolate the fire water network when inspecting the pre-valve equipment (multi-function hydraulic valve, water supply pump). The main function of the gate valve V03 and gate valve V06 is to perform backwater testing. According to 4.4.4.2 of the "Technical Code for Inspection of Building Fire Protection Facilities XF503-2004", the inlet and outlet valves of the fire water supply pump should be normally open. Therefore, the operating requirements of the fire water supply pump are as follows:

[0003] 1. In the water pump control cabinet, set the 1# fire water supply pump as the main pump to automatic status, and the 2# fire water supply pump as the backup pump to manual status.

[0004] 2. Under normal circumstances, the gate valves V01 / V04 on the inlet pipeline and the butterfly valves V02 / V05 on the outlet pipeline are in the normally open position, and the gate valves V03 / V06 on the test return pipeline are in the normally closed position.

[0005] 3. When a fire occurs and fire hydrants, fire monitors, and sprinkler water are activated, and the pipe network pressure continues to drop to 0.3Mpa, the 1# fire water supply pump will start automatically immediately.

[0006] 4. In an emergency, the 2# fire water supply pump can be manually started on the remote operation panel of the fire control center or on the on-site operation column.

[0007] 5. After starting the 1# fire water supply pump (automatic mode), the SA1 (SA1 is the master switch) state selector switch on the fire pump control cabinet must be turned to the "stop" position. After starting the 2# fire water supply pump (manual mode), the "stop" button SS2 on the on-site operating column must be pressed to stop the pump. After stopping the pump, wait until the pipe network pressure drops to 0.4 MPa, and then the pressure-stabilizing pump will automatically start.

[0008] When the fire water pump starts, the large pressure differential across the multi-function valve causes the valve to open too quickly, while the outlet butterfly valve remains open. This causes the fire water pump to start under load and generate excessive current (approximately 1300A at startup, while the fire water pump's rated current is 445A, approximately three times the rated current). This can sometimes cause the fire water pump to fail to start, causing the low-voltage bus voltage of the power distribution system to drop below 360V, causing other voltage-sensitive equipment on the same bus segment to shut down due to low-voltage protection, and even tripping the fire water pump's power switch, preventing timely fire water supply. Excessive starting current can be reduced by installing a frequency converter in the fire water pump. However, Article 3.1.8 of the "Design Specification for Automatic Fire Alarm Systems (GB50116-2013)" stipulates that variable frequency starting should not be used for fire electrical control devices such as pump control cabinets and fan control cabinets.

[0009] The invention of the existing patent number CN 106050630 B "Fire pump controller with electric control starting and mechanical emergency starting of fire pump" not only has the fire pump with electric remote starting, but also can be temporarily started manually in an emergency, solving the current problem that the fire pump cannot be started when the control circuit fails, delaying fire rescue. It can achieve the purpose of ensuring that the emergency starting device can forcibly start the equipment as long as the power supply of the fire pump is normal regardless of the control circuit. However, it does not involve the problem of controlling the starting current size, nor does it involve the problem of how to realize two fire pumps to realize one main and one backup.

[0010] Therefore, it is necessary to improve the existing electrical lines and reduce the starting current of the fire water supply pump to ensure that the fire water supply pump starts quickly and effectively to meet emergency rescue needs, while ensuring that other equipment in the same bus section does not trip due to low voltage protection. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide an intelligent starting control method for a high-power fire water supply pump, so as to reduce the starting current of the fire water supply pump and realize the automatic starting of the fire water supply pump safely under low load.

[0012] In order to solve the above technical problems, the present invention provides a high-power fire water supply pump intelligent startup control method, including 1# fire water supply pump pipeline and 1# fire water supply pump control circuit, 2# fire water supply pump pipeline and 2# fire water supply pump control circuit, fire water supply pump common control circuit and pressure regulating pump pipeline, butterfly valve V02 and butterfly valve V05 are respectively located at the outlet end of 1# fire water supply pump pipeline and 2# fire water supply pump pipeline, and the 1# fire water supply pump control circuit and the fire water supply pump common control circuit are newly added including 1SA master switch, 1KA relay, 6KA relay, 5KA relay, 2KA relay and travel switch SLC1; 2# fire water supply pump control circuit and fire water supply pump common control circuit newly include 2SA master switch, 3KA relay, 7KA relay, 8KA relay, 4KA relay and travel switch SLC2; the butterfly valve V02 becomes 1# electric valve after adding 1# electric actuator, and the butterfly valve V05 becomes 2# electric valve after adding 2# electric actuator, and the operating handwheels of butterfly valve V02 and butterfly valve V05 are retained;

[0013] The specific process of intelligent start-up of fire water pump is as follows:

[0014] S1. The fire protection pipe network pressure is monitored by the DCS system. The normal operating pressure range of the fire protection pipe network is 0.4~0.75Mpa;

[0015] S2. When the operating pressure of the fire pipe network is ≤0.4Mpa, water is supplied to the fire water pipe network through the pressure-stabilizing pump pipeline. When the pressure of the fire pipe network reaches 0.75Mpa, the pressure-stabilizing pump automatically stops operating;

[0016] S3. When the fire water network pressure is ≤0.3Mpa, the 1# fire water supply pump or 2# fire water supply pump will automatically start. Specifically:

[0017] When the 1# fire water supply pump is the main pump and the 2# fire water supply pump is the backup pump, the electric actuator first closes the butterfly valve V02, and then opens the butterfly valve V02 after the 1# fire water supply pump automatically starts, and supplies water to the fire water network through the 1# fire water supply pump pipeline;

[0018] When the 2# fire water supply pump is the main pump and the 1# fire water supply pump is the standby pump, the electric actuator first closes the butterfly valve V05, and then opens the butterfly valve V05 after the 2# fire water supply pump automatically starts, and supplies water to the fire water network through the 2# fire water supply pump pipeline.

[0019] As an improvement of the intelligent startup control method of a high-power fire water pump of the present invention:

[0020] The 1# electric actuator includes an actuator motor DF1. The three-phase power input passes through the circuit breaker QF3 and then passes through the parallel AC contactors KMo1 and KMc1 to connect to the actuator motor DF1.

[0021] The 2# electric actuator includes an actuator motor DF2. The three-phase power input passes through the circuit breaker QF4, and then passes through the parallel AC contactors KMo2 and KMc2 to be connected to the actuator motor DF2.

[0022] As a further improvement of the intelligent startup control method of a high-power fire water pump of the present invention:

[0023] In the 1# fire water pump control circuit, the first 1KA relay normally open contact is connected in parallel between the marking point 113 and the marking point 115, and a 1SA main switch is added between the marking point 115 and the neutral line N. Terminals 1 and 3 of the 1SA main switch are both connected to the marking point 115, terminal 2 is connected to the neutral line N after passing through the KA1 coil, terminal 4 is connected to the neutral line N after passing through the 1KA relay coil, and pin 4 is connected to the neutral line N after passing through the 2KA relay normally closed contact and the 6KA relay coil; after the travel switch SLC1 is connected in parallel with the first 5KA relay normally open contact, one end is connected to the terminal 4 of the 1SA main switch, and the other end is connected to the neutral line N after passing through the 5KA relay coil; at the same time, the two ends of the travel switch SLC1 are connected to terminals 12 and 14 of the 1# electric actuator.

[0024] Add a second 5KA relay normally open contact between terminals 9 and 10 of the 1# pump soft starter. Connect terminal 2 to the neutral line N through the second 1KA relay normally open contact and the 2KA relay coil. Connect a third 1KA relay normally open contact in parallel between points 139 and 141.

[0025] One end of the normally open contact of the 6KA relay and the normally open contact of the 2KA relay are both connected to terminal 7 of the 1# electric actuator, the other end of the normally open contact of the 6KA relay is connected to terminal 8 of the 1# electric actuator, and the other end of the normally open contact of the 2KA relay is connected to terminal 9 of the 1# electric actuator.

[0026] As a further improvement of the intelligent startup control method of a high-power fire water pump of the present invention:

[0027] In the 2# fire water pump control circuit, the normally open contact of the first 3KA relay is connected in parallel between the marked point 213 and the marked point 215, and a 2SA main switch is added between the marked point 215 and the neutral line N. Terminals 1 and 3 of the 2SA main switch are both connected to the marked point 215, terminal 2 is connected to the neutral line N after passing through KA4, terminal 4 is connected to the neutral line N after passing through the 3KA relay, and terminal 4 is connected to the neutral line N after passing through the normally closed contact of the 4KA relay and the 8KA relay coil;

[0028] After the limit switch SLC2 is connected in parallel with the normally open contact of the first 7KA relay, one end is connected to terminal 4 of the 2SA master switch, and the other end is connected to the neutral line N after passing through the 7KA relay coil; the two ends of the limit switch SLC2 are connected to terminals 12 and 14 of the 2# electric actuator.

[0029] Add a second 7KA relay normally open contact between terminals 9 and 10 of the 2# pump soft starter. Connect terminal 2 to the neutral line N after passing through the second 3KA relay normally open contact and the 4KA relay. Connect a third 3KA relay normally open contact in parallel at points 239 and 241.

[0030] One end of the normally open contact of the 8KA relay and the normally open contact of the 4KA relay are both connected to terminal 7 of the 2# electric actuator, the other end of the normally open contact of the 8KA relay is connected to terminal 8 of the 2# electric actuator, and the other end of the normally open contact of the 4KA relay is connected to terminal 9 of the 2# electric actuator.

[0031] As a further improvement of the intelligent startup control method of a high-power fire water pump of the present invention:

[0032] A 1KA relay normally closed contact is connected in series between the marking points 17 and 17- of the fire water supply pump common control circuit, and a 3KA relay normally closed contact is connected in series between the marking points 21 and 21-.

[0033] As a further improvement of the intelligent startup control method of a high-power fire water pump of the present invention:

[0034] The process of automatic starting of the No. 1 fire water pump is as follows:

[0035] (1) When the fire water pipe network pressure is ≤0.3Mpa, the fire linkage switch K point is closed, the relay KA12 is energized, and the output starts the fire water pump signal;

[0036] (2) SA1 is in the automatic position, the 1SA master switch is in the valve automatic position, the three 1KA relay normally open contacts are closed and self-holding, and the 1# fire water supply pump automatically runs; at the same time, SA2 is in the manual position, the 2SA master switch is in the valve automatic position, and the 2# fire water supply pump is in manual operation standby state;

[0037] (3) The 1KA relay is energized, and the 6KA relay is energized and closed through the 1SA master switch, and the 1# electric valve executes the closing command;

[0038] (4) After the 1# electric valve is fully closed, the travel switch SLC1 is automatically closed;

[0039] (5) The normally open contact of the second 5KA relay closes, and the soft starter of pump 1# starts automatically;

[0040] (6) After the 1# pump soft starter is started, the bypass contactor KM1 works, the normally open contact of the 2KA relay closes, and the 1# electric valve performs the valve opening action until the valve automatically opens to 100%.

[0041] As a further improvement of the intelligent startup control method of a high-power fire water pump of the present invention:

[0042] The process of automatic starting of the 2# fire water pump is as follows:

[0043] (1) When the fire water pipe network pressure is ≤0.3Mpa, the fire linkage switch K point is closed, the relay KA12 is energized, and the output starts the fire water pump signal;

[0044] (2) SA1 is in the manual position, the 1SA master switch is in the valve automatic position, and the 1# fire water supply pump is in manual operation standby state. At the same time, SA2 is in the automatic position, the 2SA master switch is in the valve automatic position, and the three 3KA relay normally open contacts are energized and closed, and the 2# fire water supply pump automatically operates;

[0045] (3) The 3KA relay is energized, and the 8KA relay is energized and closed through the 2SA master switch, and the 2# electric valve executes the closing command;

[0046] (4) After the 2# electric valve is fully closed, the travel switch SLC2 is automatically closed;

[0047] (5) The normally open contact of the second 7KA relay closes, and the soft starter of pump 2 starts automatically;

[0048] (6) After the 2# pump soft starter is started, the bypass contactor KM2 works, the normally open contact of the 4KA relay closes, and the 2# electric valve performs the valve opening action until the valve automatically opens to 100%.

[0049] The beneficial effects of the present invention are mainly reflected in:

[0050] 1. This invention provides an intelligent startup control method for high-power fire water pumps. This method eliminates the need for a frequency converter (VFD) on the fire water pump and is applicable to all fire water pumps with a capacity of 200 kW and above. By adding an electric actuator and control components to the fire pump's outlet butterfly valve and configuring automatic control logic, the valve automatically closes and opens when the fire water pump starts. This solves the problem of under-load startup and reduces the pump's starting current.

[0051] 2. The present invention can prevent the fire water supply pump from tripping due to excessive starting current and low system voltage, and realize low-load, safe, fast and effective automatic start and stop of the fire water supply pump, thereby improving the reliability and operability of the fire protection system.

[0052] 3、The application can greatly reduce the starting current of the fire water supply pump (the starting current is reduced from about 1300A to about 600A) after adding the electric actuator to the butterfly valve at the outlet of the fire water supply pump, the low-voltage bus voltage is maintained above 375V during starting, and the electrical equipment in the same section of the bus will not be protected from shutdown due to excessively low voltage, thereby improving the safety and stable operation of enterprise equipment.

[0053] 4、After the electrical transformation of the electric butterfly valve at the outlet of the fire water supply pump according to the application, the soft starter has a starting time of about 10S, the fire water supply pump is started quickly under light load, and the manual operation of the butterfly valve is retained, thereby meeting the requirements of forced or emergency pump starting.

[0054] 5、The method of the application has low investment cost, and the intelligent starting optimization scheme of the fire water supply pump can be implemented without affecting the normal operation of the production device of the enterprise, thereby improving the reliability and operability of the fire protection system of the chemical enterprise after transformation. BRIEF DESCRIPTION OF DRAWINGS

[0055] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings.

[0056] Figure 1 A line diagram of the main circuit of the electric valve added to the fire water supply pump of the application;

[0057] Figure 2 A schematic diagram of the original current measurement and overload protection control circuit of the fire water supply pump;

[0058] Figure 3 A public control circuit of the fire water supply pump of the application;

[0059] Figure 4 A control circuit of the 1# fire water supply pump of the application;

[0060] Figure 5 A control circuit of the 2# fire water supply pump of the application;

[0061] Figure 6 An electric principle diagram of the electric valve of the application;

[0062] Figure 7 An inlet and outlet pipeline of the fire water supply pump after transformation of the application;

[0063] Figure 8 An inlet and outlet pipeline of the fire water supply pump before transformation. DETAILED DESCRIPTION

[0064] The application will be further described below in combination with specific embodiments, but the protection scope of the application is not limited to this:

[0065] Example 1,

[0066] The import and export pipeline of the fire water pump before the modification includes three pipelines (1# fire water pump pipeline, 2# fire water pump pipeline and pressure pump pipeline) arranged in parallel with each other as shown in Figure 8 The 1# fire water pump pipeline is sequentially connected by a gate valve V01, a 1# fire water pump, a multifunctional valve V28 and a butterfly valve V02. The 2# fire water pump pipeline is sequentially connected by a gate valve V04, a 2# fire water pump, a multifunctional valve V29 and a butterfly valve V05. The pressure pump pipeline is sequentially connected by a gate valve V10, a pressure pump, a gate valve V11, a pressure transmitter and an electric contact pressure gauge. The multifunctional valve V28 returns to the fire water pool through a gate valve V03, and the multifunctional valve V29 returns to the fire water pool through a gate valve V06 to realize water return test. The fire water pool is connected with the gate valve V01, the gate valve V04 and the gate valve V10 through pipelines to serve as the input of fire water, and the butterfly valve V02, the butterfly valve V05 and the outlet end of the electric contact pressure gauge are connected to form a pipeline to be connected with the fire water pipeline network to realize the backup of the 1# fire water pump pipeline and the 2# fire water pump pipeline. The pressure pump is used to maintain the pressure of the fire water pipeline network to provide fire water meeting the pressure requirement for the fire pump after starting. The pressure pump is connected with the DCS system to control the start and stop of the pressure pump. The pressure transmitter is connected with the DCS system to convert the measured pressure signal into a standard electric signal to input the pressure of the import and export pipeline of the fire water pump (i.e. the fire water pipeline network) to the DCS system to control the start and stop of the pressure pump to control the pressure of the fire water pipeline network within 0.4-0.75 MPa.

[0067] According to the "Building Fire Facilities Detection Technical Regulations XF503-2004", the import and export valves of the fire water pump should be always open, and thus the operation requirements of the fire water pump are as follows:

[0068] 1. The 1# fire water pump is set as the main pump in the automatic state and the 2# fire water pump is set as the standby pump in the manual state in the water pump control cabinet.

[0069] 2. The gate valve V01 / gate valve V04 on the import pipeline and the butterfly valve V02 / butterfly valve V05 on the export pipeline are always open, and the gate valve V03 / gate valve V06 on the water return pipeline is always closed.

[0070] 3. When the fire hydrant, the fire water cannon and the spray water are used, the pressure of the pipeline network is continuously low to 0.3 MPa, and the 1# fire water pump is immediately started in the automatic state.

[0071] 4. The 2# fire water pump can be started manually on the remote operation panel of the fire control center or on the field operation column in the emergency.

[0072] 5. After starting the 1# fire water supply pump (automatic state), the SA1 state selection switch on the on-site control cabinet must be turned to the "stop" position. After starting the 2# fire water supply pump (manual state), the "stop" button SS2 on the on-site operating column must be pressed to stop the pump. After stopping the pump, when the pipe network pressure drops to 0.4Mpa, the pressure-stabilizing pump will start automatically.

[0073] The modified high-power fire water supply pump intelligent starting control device is suitable for the intelligent starting control of all fire water supply pumps of 200KW and above. It includes adding an electric actuator to the fire water supply pump outlet butterfly valve and modifying the fire water supply pump electrical control circuit to achieve startup program logic optimization and reduce the starting current of the fire water supply pump.

[0074] Add electric actuators to butterfly valve V02 and butterfly valve V05 (i.e., butterfly valve V02 is equipped with 1# electric actuator, and butterfly valve V05 is equipped with 2# electric actuator) to realize the automatic opening and closing of butterfly valve V02 and butterfly valve V05. The electric actuators are selected from the ZB and ZC series integral multi-turn valve electric actuators of Changzhou Power Plant Auxiliary Equipment Co., Ltd., including the actuator motor DF and the electric valve control main circuit. Connect the signal line of the electric contact pressure gauge to the public control circuit of the fire water pump ( Figure 3 The k point in the pipeline is connected to the signal of the fire water supply pump, which is used to start the fire water supply pump in a linked manner. When the pipe network pressure is lower than 0.3Mpa, the k point is closed and the fire water supply pump is automatically started.

[0075] Add 2 electric valves to the main circuit of the fire water pump to control the main circuit, such as Figure 1 As shown, the dotted box in position 1 represents the added components. The 1# electric valve is modified by adding the 1# electric actuator (AC contactor KMo1, AC contactor KMc1, actuator motor DF1, and the corresponding control circuit) to butterfly valve V02. The 2# electric valve is modified by adding the 2# electric actuator (AC contactor KMo2, AC contactor KMc2, actuator motor DF2, and the corresponding control circuit) to butterfly valve V05. The three-phase power input passes through circuit breaker QF3, then through the parallel AC contactors KMo1 and KMc1, and is connected to the actuator motor DF2 of the 1# electric valve. The three-phase power input passes through circuit breaker QF4, then through the parallel AC contactors KMo2 and KMc2, and is connected to the actuator motor DF2 of the 2# electric valve.

[0076] The electrical schematic diagram of the electric actuator control circuit is as follows: Figure 6 As shown (the wiring circuits of the 1# electric actuator and the 2# electric actuator are the same, in order to simplify the description, the wiring circuits of the two electric actuators are unified into one diagram, for example Figure 6The AC contactor KMo in the figure represents the AC contactor KMo1 in the wiring circuit of the 1# electric valve, and the AC contactor KMo2 in the wiring circuit of the 2# electric valve, and so on. The three-phase main power supply is connected to the AC contactor KMo through the circuit breaker QF3 (or QF4) and the wiring terminals U, V, and W. The function of the AC contactor KMo is to execute the forward and reverse switching of the actuator motor DF of the electric actuator to realize the action of the switch valve, wherein the AC contactor KMo executes the valve opening action of the electric valve, and the AC contactor KMc executes the valve closing action of the electric valve. The control terminals 7, 8, and 9 of the electric actuator are the switch valve command input terminals, which are used to input the switch valve control signal (when the switch valve control signal is input from the 1# fire water supply pump control circuit, the 1# electric valve executes the switch valve action; when the switch valve control signal is input from the 2# fire water supply pump control circuit, the 2# electric valve executes the switch valve action). The electric actuator control terminals 12 and 14 are the valve-closed position signal output terminals of the electric actuator (i.e., when terminals 12 and 14 of the 1# electric actuator are connected, the 1# electric valve close position signal is output; when terminals 12 and 14 of the 2# electric actuator are connected, the 2# electric valve close position signal is output). When terminals 12 and 14 are connected, the fire water pump is ready for starting. If terminals 12 and 14 are disconnected, it is because the pump start command has not been received or the electric actuator is performing the valve closing action but has not been completely closed.

[0077] The electrical control circuit of the fire water pump before the transformation is as follows Figure 3 、 4 The solid line part shown in Figure 5 shows that the fire water pump electrical control circuit after the transformation has increased Figure 3 、 4 The dotted box positions 2-10 in Figure 5 are newly added including 1SA master switch, 1KA relay, 6KA relay, 5KA relay, 2KA relay and limit switch SLC1, 2SA master switch, 3KA relay, 7KA relay, 8KA relay, 4KA relay and limit switch SLC2.

[0078] Among them, the 1KA relay includes three 1KA relay normally open contacts (the first 1KA relay normally open contact, the second 1KA relay normally open contact, and the third 1KA relay normally open contact), a 1KA relay normally closed contact, and a 1KA relay coil. When the 1KA relay is energized, the first 1KA relay normally open contact, the second 1KA relay normally open contact, and the third 1KA relay normally open contact are all closed, and the 1KA relay normally closed contact opens, realizing the path switching of the corresponding circuit, thereby enabling the 1# electric valve to obtain control power in the automatic valve state, facilitating the automatic execution of the next instruction. The 5KA relay includes the first 5KA relay normally open contact and the second 5KA relay normally open contact) and a 5KA relay coil. The 2KA relay includes the 2KA relay normally open contact, the 2KA relay normally closed contact, and the 2KA relay coil. The 6KA relay includes the 6KA relay normally open contact and the 6KA relay coil. The 3KA relay includes three 3KA relay normally open contacts (the first 3KA relay normally open contact, the second 3KA relay normally open contact, and the third 3KA relay normally open contact), a 3KA relay normally closed contact, and a 3KA relay coil. The 7KA relay includes the first 7KA relay normally open contact, the second 7KA relay normally open contact, and a 7KA relay coil. The 8KA relay includes the 8KA relay normally open contact and the 8KA relay coil. The 4KA relay includes the 4KA relay normally open contact, the 4KA relay normally closed contact, and a 4KA relay coil.

[0079] The circuit connections for adding devices are as follows:

[0080] Fire water pump common control circuit, such as Figure 3 As shown, the dotted box is an added part. The 1KA relay normally closed contact is connected in series between the marking points 17 and 17- of the circuit for delayed automatic switching of the standby pump, and the 3KA relay normally closed contact is connected in series between the marking points 21 and 21- to interlock the automatic switching of the standby pump failure (when the 1# fire water supply pump fails, the 2# fire water supply pump is automatically used as the standby pump; when the 2# fire water supply pump fails, the 1# fire water supply pump is automatically used as the standby pump; the two pumps cannot run at the same time). In the circuit part of "fire linkage control", the fire linkage switch K point is used for the electric contact pressure gauge (i.e. Figure 7 、 8 When the electric contact pressure gauge measures a pressure lower than 0.3 MPa, the fire linkage switch K is closed and the output signal for starting the fire water pump is input.

[0081] 1# fire water pump control circuit, such as Figure 4 As shown, the dotted boxes shown in positions 3-6 are the added control components. Figure 4In the "manual control and automatic control" circuit section, connect the first 1KA relay normally open contact in parallel between the marked points 113 and 115 ( Figure 4 Position 3), used for the control power supply of 1# fire water pump and 1# electric valve, with self-protection function. Between the marked point 115 and the neutral line N ( Figure 4 Position 4) adds a 1SA master switch, which has two positions: automatic and manual. Terminals 1 and 3 of the 1SA master switch are connected to point 115. Terminal 2 is connected to the neutral line N after passing through the KA1 coil, and terminal 4 is connected to the neutral line N after passing through the 1KA relay coil. Pin 4 is connected to the neutral line N after passing through the normally closed contact of the 2KA relay and the 6KA relay coil. The 1SA master switch switches the 1# electric valve from automatic operation to automatic operation. When the switch is in the manual position (1SA terminals 1 and 2 connected, terminals 3 and 4 disconnected), the pre-modification startup mode is restored. When the switch is in the automatic position (1SA terminals 1 and 2 disconnected, terminals 3 and 4 connected), the 1# electric valve automatically opens. The 1KA relay provides control power for the electric valve. The 6KA relay provides the closing command for the 1# electric valve, and the 2KA relay provides the closing command for the 1# electric valve.

[0082] After the travel switch SLC1 is connected in parallel with the normally open contact of the first 5KA relay, one end is connected to terminal 4 of the 1SA master switch, and the other end is connected to the neutral line N after passing through the 5KA relay coil. The function of the 5KA relay is to issue a pump start command when the 1# electric valve is fully closed (travel switch SLC1 is closed), allowing the 1# pump soft starter to start the 1# fire water supply pump. At the same time, the two ends of the travel switch SLC1 are connected to terminals 12 and 14 of the 1# electric actuator (such as Figure 6 The feedback is whether the electric valve DF1 is fully closed.

[0083] exist Figure 4 In the "soft start and stop control" circuit part, the terminal 9 of the 1# pump soft starter (control board JJR1000) is connected to the terminal 10 through the normally open contact of the KA1 relay and the normally open contact of the second 5KA relay in parallel. It is used for the 1# pump soft starter to execute the start command (when the 1# electric valve is fully closed (travel switch SLC1 is closed) Figure 4 Position 5). Control terminal 2 of the 1# pump soft starter is connected to the neutral line N through the normally open contact of the second 1KA relay and the coil of the 2KA relay. The normally open contact of the second 1KA relay is used to issue a valve opening command only when the valve is in the automatic state. The 2KA relay is used to execute the valve opening command of the 1# electric valve.

[0084] exist Figure 4In the "fire return signal" circuit part, the normally open contact of the third 1KA relay is connected in parallel between marking points 139 and 141 to feedback to the fire control center that the 1# fire pump has received the pump start command.

[0085] exist Figure 4 In the "valve closing and opening" circuit part, the 1# electric valve closing (6KA relay normally open contact) and valve opening (2KA relay normally open contact) instruction circuits are added ( Figure 4 Position 6), connected to the control circuit of the electric actuator through a cable ( Figure 6 ) to execute the valve closing and opening actions. One end of the 6KA relay normally open contact and the 2KA relay normally open contact are connected to the terminal 7 ( Figure 6 As shown), the other end of the normally open contact of the 6KA relay is connected to terminal 8 (remote control terminal, Figure 6 The other end of the normally open contact of the 2KA relay is connected to the terminal 9 (remote open control terminal, Figure 6 When the 1# electric valve is fully closed (travel switch SLC1 is closed), the 1# pump soft starter starts the 1# fire water pump. When the start is completed, the 2KA relay is closed, and the 1# electric valve opens until the valve is fully opened.

[0086] 2# fire water pump control circuit, such as Figure 5 As shown, similar to the 1# fire water pump control circuit, the control elements shown in positions 7-10 are added. Figure 5 In the "manual control and automatic control" circuit, the first 3KA relay normally open contact is connected in parallel between the marked points 213 and 215 ( Figure 5 Position 7), used for the control power supply of 2# fire water pump and 2# electric valve, with self-protection function. Between the marked point 215 and the neutral line N ( Figure 5 Position 8) Add a 2SA master switch, including two positions: automatic and manual. Terminals 1 and 3 of the 2SA master switch are both connected to point 215. Terminal 2 is connected to the neutral line N through KA4, and terminal 4 is connected to the neutral line N through the 3KA relay. Terminal 4 is also connected to the neutral line N through the normally closed contact of the 4KA relay and the coil of the 8KA relay. The function of the 2SA master switch is to switch the 2# electric valve to automatic operation. When it is in the manual position, the start-up mode before the modification is restored. When it is in the automatic position, the 2# electric valve automatically opens. The 3KA relay provides control power for the 2# electric valve, and the 8KA relay provides the closing command for the 2# electric valve.

[0087] After the limit switch SLC2 is connected in parallel with the normally open contact of the first 7KA relay, one end is connected to terminal 4 of the 2SA master switch, and the other end is connected to the neutral line N after passing through the 7KA relay coil. The function of the 7KA relay is to allow the 2# pump soft starter to start the 2# fire water supply pump only when the 2# electric valve is fully closed (limit switch SLC2 is closed). The two ends of the limit switch SLC2 are connected to terminals 12 and 14 of the 2# electric actuator ( Figure 6 ) to provide feedback on whether the electric valve DF2 is fully closed.

[0088] exist Figure 5 In the "soft start and soft stop control" circuit part, a second 7KA relay normally open contact is added between terminals 9 and 10 of the 2# pump soft starter (control board JJR1000). When the 2# electric valve is fully closed (travel switch SLC2 is closed), the 2# pump soft starter starts the motor of the 2# fire water pump ( Figure 5 Position 9). Add a second 3KA relay's normally open contact and a 4KA relay coil between the control terminal 2 and the neutral line N of the 2# pump soft starter. Connect the second 3KA relay's normally open contact to the neutral line N after passing through the 4KA relay. The 4KA relay serves as the opening command for the 2# electric valve.

[0089] exist Figure 5 In the "fire return signal" circuit part, the third 3KA relay normally open contact is connected in parallel at the marked points 239 and 241 to feedback to the fire control center that the 2# fire water supply pump has received the pump start command. Figure 5 In the "valve closing and opening" circuit part, the 2# electric valve closing (8KA relay normally open contact) and valve opening (4KA relay normally open contact) instruction circuits are added ( Figure 5 Position 10), connect to the on-site 2# electric valve ( Figure 6 ), execute the valve closing and opening action. One end of the 8KA relay normally open contact and the 4KA relay normally open contact are connected to the control circuit of the 2# electric actuator ( Figure 6 ) is connected to the marked point 7 shown in the figure, and the other end of the normally open contact of the 8KA relay is connected to the control circuit of the 2# electric actuator ( Figure 6 ) is connected to the marked point 8 (remote control terminal) shown in the figure, and the other end of the normally open contact of the 4KA relay is connected to the control circuit of the 2# electric actuator ( Figure 6 ) is connected to the marked point 9 (remote open control terminal) shown in the figure. When the 2# electric valve is closed (travel switch SLC2 is closed), the 2# pump soft starter starts the 2# fire water pump. When the start is completed, the 4KA relay is closed, and the 2# electric valve opens until the valve is fully opened.

[0090] The intelligent startup control method of the high-power fire water pump of the present invention is specifically as follows:

[0091] 1. Install electric actuators on the fire water pump outlet butterfly valve V02 and butterfly valve V05, and retain the operating handwheels of butterfly valve V02 and butterfly valve V05;

[0092] 2. The fire water pipe network pressure is monitored by the DCS system, and the normal operating pressure of the fire water pipe network is controlled within 0.4~0.75Mpa;

[0093] 3. When the operating pressure of the fire water network is ≤0.4Mpa, water will be added to the fire water network through the pressure-stabilizing pump to increase and stabilize the network pressure. When the fire network pressure reaches 0.75Mpa, the pressure-stabilizing pump will automatically stop operating;

[0094] 4. When a fire occurs and fire hydrants, fire monitors, and sprinklers are activated, and the fire water network pressure is ≤0.3Mpa, and the water supply from the pressure-stabilizing pump is insufficient to meet water demand, the 1# fire water supply pump or the 2# fire water supply pump will automatically start. The automatic start-up conditions for the fire water supply pump and the automatic control logic of the electric valve at the fire water supply pump outlet are as follows:

[0095] 4.1. When the fire water pipe network pressure is ≤0.3Mpa, Figure 3 The fire linkage switch K point is closed, relay KA12 is energized, and the output signal to start the fire water pump is output;

[0096] 4.2. The 1KA relay or 3KA relay is energized and closed, and the fire water supply pump is one in operation and one in standby. Specifically:

[0097] 4.2.1. 1# fire water supply pump is the main pump, and 2# fire water supply pump is the backup pump;

[0098] (1) SA1 is in the automatic position (SA1 is the original master switch, installed on the fire pump control cabinet. It must be in the automatic position to ensure water pressure linkage control). The 1SA master switch is in the valve automatic position. The three 1KA relay normally open contacts are closed and self-holding. The 1# fire water supply pump runs automatically. At the same time, SA2 is in the manual position. The 2SA master switch is in the valve automatic position. The 2# fire water supply pump runs manually.

[0099] (2) The 6KA relay is energized and closed, and the No. 1 electric valve at the fire water pump outlet executes the valve closing command:

[0100] When the 1# fire water pump automatically supplies water, the 1KA relay is energized, and the 6KA relay is energized and closed via the 1SA master switch, and the 1# electric valve executes the closing command;

[0101] (3) After 12 seconds, the No. 1 electric valve at the outlet of the fire water pump is closed, and the travel switch SLC1 (position No. 4) is automatically closed;

[0102] (4) The normally open contact of the second 5KA relay (position 5) is closed, and the soft starter of pump 1# starts automatically. The starting ammeter shows about 600A, and the startup is completed in about 10 seconds;

[0103] (5) Bypass contactor KM1 works, and the normally open contact of the 2KA relay (position 6) is closed. At this time, the ammeter displays about 200A, and the 1# electric valve at the outlet of the fire water pump performs the valve opening action until the valve automatically opens to 100%, which takes about 10 seconds. At this time, the ammeter displays about 430A;

[0104] 4.2.2. 2# fire water supply pump is the main pump and 1# fire water supply pump is the backup pump.

[0105] (1) SA1 is in the manual position, the 1SA master switch is in the valve automatic position, and the 1# fire water supply pump is manually operated. At the same time, SA2 is in the automatic position, the 2SA master switch is in the valve automatic position, and the three 3KA relay normally open contacts are energized and closed, and the 2# fire water supply pump is automatically operated.

[0106] (2) The 8KA relay is energized and closed, and the 2# electric valve at the outlet of the fire water pump executes the valve closing command:

[0107] When the 2# fire water supply pump is automatically supplied with water, the 3KA relay is energized, and the 8KA relay is energized and closed through the 2SA main switch, and the 2# electric valve executes the closing command.

[0108] (3) After 12 seconds, the 2# electric valve at the outlet of the fire water pump is closed, and the travel switch SLC2 (position 8) is automatically closed;

[0109] (4) The normally open contact of the second 7KA relay (position 9) is closed, and the soft starter of pump 2 starts automatically. The starting ammeter shows about 600A, and the startup is completed in about 10 seconds;

[0110] (5) Bypass contactor KM2 works, and the normally open contact of the 4KA relay (position 10) is closed. At this time, the ammeter displays about 200A, and the 2# electric valve at the outlet of the fire water pump performs the valve opening action until the valve automatically opens to 100%, which takes about 10 seconds. At this time, the ammeter displays about 430A;

[0111] At this point, the fire water pump self-starting process is completed.

[0112] 5. Keep the existing manual starting method. When installing an electric actuator on the fire water supply pump outlet butterfly valve, retain the manual operation handwheel of the butterfly valve, and the electric actuator box cover is equipped with a "site / remote control" knob and a "switch" knob. When renovating the electrical circuit, add a selection switch to divide the remote control start (automatic valve opening) and site start (manual valve opening) states, and retain the original manual starting method to meet the requirements of forced or emergency start of the fire water supply pump. When the fire water supply pump is automatically running with one start and one standby, SA1 and SA2 should be in the automatic valve position to ensure the automatic closing and opening of the 1# electric valve and the 2# electric valve. If both are in the manual valve position, the starting method before the modification will be restored.

[0113] experiment

[0114] This invention is applicable to the intelligent startup control of all high-power (200kW and above) fire water pumps, including the electrical equipment control systems involved in fire water pumps and their outlet electric butterfly valves. Based on the established control logic for the fire water pumps and their outlet electric butterfly valves, the system can significantly reduce the starting current of the fire water pumps, enabling safe, rapid, and low-load automatic startup of the fire water pumps. This solves the problem of excessive startup loads on the fire water pumps, which can cause other important equipment on the same busbar segment to shut down due to low power supply voltage. While retaining the existing manual startup method, it meets mandatory or emergency pump startup requirements.

[0115] Experiment 1: Remote automatic start control of No. 1 fire water supply pump and outlet butterfly valve:

[0116] 1) Turn the start knob SA1 of the 1# fire water supply pump in the fire water supply pump control cabinet to the "automatic" position, and turn the 1SA main switch to the "valve automatic" position;

[0117] 2) Turn the 1# electric actuator of the 1# fire water pump outlet butterfly valve V02 to the "remote control" position;

[0118] 3) Open the fire hydrants and fire monitors, and adjust the water flow rate to gradually reduce the pressure of the fire water network. When the pressure of the fire water network drops by ≤0.3Mpa, the outlet butterfly valve V02 of the 1# fire water pump starts to close automatically;

[0119] 4) The V02 limit switch of the outlet butterfly valve of the 1# fire water pump automatically closes, and the valve closes in place after about 12 seconds;

[0120] 5) The soft starter of the 1# fire water supply pump starts working. At this time, the ammeter shows a current of 600A and a voltage of 390V. After about 10 seconds, the bypass contactor KM1 starts working and the self-start of the 1# fire water supply pump is completed. At this time, the ammeter shows a current of 200A;

[0121] 6) The outlet butterfly valve V02 of the 1# fire water supply pump opens automatically. After about 10 seconds, the opening degree of the outlet butterfly valve V02 of the 1# fire water supply pump reaches 100% (the ammeter shows a current of 430A);

[0122] 7) The 1# fire water supply pump starts automatically and supplies water to the fire water network normally.

[0123] 8) Close the water outlet of the fire-fighting pipe, turn off the fire-fighting water monitor, turn the fire-fighting water pump start knob SA1 of the fire-fighting water pump control cabinet to the "stop" position, and the 1# fire-fighting water pump stops running. At this time, the fire-fighting water pump outlet butterfly valve V02 remains fully open.

[0124] Experiment 2: On-site start-up control logic for No. 1 fire water pump and outlet butterfly valve

[0125] 1) Turn the start knob SA1 of the fire water supply pump control cabinet 1# to the "manual" position, and turn the 1SA main switch to the "valve automatic" position;

[0126] 2) Turn the 1# electric actuator to the "remote control" position;

[0127] 3) Press the "Start" button on the on-site operating column of the 1# fire water supply pump, and the outlet butterfly valve V02 begins to close;

[0128] 4) The outlet butterfly valve V02 of the 1# fire water supply pump is opened for about 12 seconds and then the valve is closed;

[0129] 5) The soft starter of the 1# fire water supply pump starts working. At this time, the ammeter shows a current of 600A and a voltage of 390V. After about 10 seconds, the bypass contactor KM1 starts working and the self-start of the 1# fire water supply pump motor is completed. At this time, the ammeter shows a current of 200A;

[0130] 6) The outlet butterfly valve V02 of the 1# fire pump opens automatically. After about 10 seconds, the opening degree of the outlet butterfly valve V02 of the 1# fire pump reaches 100% (the ammeter shows a current of 430A);

[0131] 7) The 1# fire water supply pump was started on site and is supplying water to the fire water network normally.

[0132] 8) Close the water outlet of the fire-fighting pipe, turn off the fire-fighting water monitor, press the "Stop" button on the on-site operating column of the 1# fire-fighting water pump, and the fire-fighting water pump will stop running. At this time, the fire-fighting water pump outlet butterfly valve V02 remains fully open.

[0133] Experiment 3: On-site manual start-up control logic of 1# fire water supply pump and outlet butterfly valve

[0134] When the electric actuator of the outlet butterfly valve fails and cannot automatically close or open the valve, manual closing or opening of the valve can be used to start the fire water pump.

[0135] 1) Turn the start knob SA1 of the 1# fire water pump control cabinet to the "manual" position and the 1SA main switch to the "valve manual" position;

[0136] 2) Turn the No. 1 electric actuator to the "off" position;

[0137] 3) Push the handwheel operating lever of the electric actuator of butterfly valve V02 in the direction indicated by the arrow, and manually rotate the handwheel of outlet butterfly valve V02 to the right. After about 30 seconds, the valve will close in place.

[0138] 4) Press the "Start" button on the on-site operation column of the No. 1 fire water supply pump;

[0139] 5) The soft starter of the 1# fire water supply pump starts working. At this time, the ammeter shows a current of 600A and a voltage of 390V. After about 10 seconds, the bypass contactor KM1 starts working and the 1# fire water supply pump is started. At this time, the ammeter shows a current of 200A;

[0140] 6) Manually rotate the handwheel of butterfly valve V02 to the left to open the valve. After about 30 seconds, butterfly valve V02 is fully open (the ammeter shows a current of 430A);

[0141] 7) The manual start-up of the 1# fire water supply pump on site was completed and water was supplied to the fire water network normally.

[0142] 8) Close the water outlet of the fire-fighting pipe, turn off the fire-fighting water monitor, press the "Stop" button on the on-site operating column of the 1# fire-fighting water pump, and the fire-fighting water pump will stop running. At this time, the fire-fighting water pump outlet butterfly valve V02 remains fully open.

[0143] Through the above test examples of automatic control and on-site control of 1# fire water supply pump and butterfly valve V02, we can see that for high-power fire water supply pumps, not only can the operation be started intelligently, which is safe, fast and labor-saving, but it can also be started manually on-site to meet the requirements of forced or emergency pump start-up. At the same time, the current and voltage measurements during the operation show that the butterfly valves V02 and V05 are equipped with electric actuators and the electrical control circuit of the fire water supply pump is modified to optimize the startup program logic and reduce the starting current of the pump.

[0144] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples and is subject to numerous variations. All variations that can be directly derived or conceived by a person of ordinary skill in the art from the disclosure of the present invention are considered to be within the scope of protection of the present invention.

Claims

1. A high-power fire water supply pump intelligent startup control method, including a 1# fire water supply pump pipeline and a 1# fire water supply pump control circuit, a 2# fire water supply pump pipeline and a 2# fire water supply pump control circuit, a fire water supply pump common control circuit, and a pressure-stabilizing pump pipeline. Butterfly valves V02 and V05 are located at the outlet ends of the 1# fire water supply pump pipeline and the 2# fire water supply pump pipeline, respectively. The method is characterized by: The 1# fire water supply pump control circuit and the fire water supply pump common control circuit are newly equipped with a 1SA master switch, a 1KA relay, a 6KA relay, a 5KA relay, a 2KA relay and a travel switch SLC1; the 2# fire water supply pump control circuit and the fire water supply pump common control circuit are newly equipped with a 2SA master switch, a 3KA relay, a 7KA relay, an 8KA relay, a 4KA relay and a travel switch SLC2; the butterfly valve V02 becomes a 1# electric valve after being equipped with a 1# electric actuator, and the butterfly valve V05 becomes a 2# electric valve after being equipped with a 2# electric actuator, and the operating handwheels of the butterfly valves V02 and V05 are retained; The specific process of intelligent start-up of fire water pump is as follows: S1. The fire protection pipe network pressure is monitored by the DCS system. The normal operating pressure range of the fire protection pipe network is 0.4~0.75Mpa; S2. When the operating pressure of the fire pipe network is ≤0.4Mpa, water is supplied to the fire water pipe network through the pressure-stabilizing pump pipeline; when the pressure of the fire pipe network reaches 0.75Mpa, the pressure-stabilizing pump automatically stops operating; S3. When the fire water network pressure is ≤0.3Mpa, the 1# fire water supply pump or 2# fire water supply pump will automatically start. Specifically: When the 1# fire water supply pump is the main pump and the 2# fire water supply pump is the backup pump, the electric actuator first closes the butterfly valve V02, and then opens the butterfly valve V02 after the 1# fire water supply pump automatically starts, and supplies water to the fire water network through the 1# fire water supply pump pipeline; When the 2# fire water supply pump is the main pump and the 1# fire water supply pump is the standby pump, the electric actuator first closes the butterfly valve V05, and then opens the butterfly valve V05 after the 2# fire water supply pump automatically starts, and supplies water to the fire water network through the 2# fire water supply pump pipeline.

2. The intelligent startup control method for a high-power fire water pump according to claim 1 is characterized in that: The 1# electric actuator includes an actuator motor DF1. The three-phase power input passes through the circuit breaker QF3 and then passes through the parallel AC contactors KMo1 and KMc1 to connect to the actuator motor DF1. The 2# electric actuator includes an actuator motor DF2. The three-phase power input passes through the circuit breaker QF4, and then passes through the parallel AC contactors KMo2 and KMc2 to be connected to the actuator motor DF2.

3. The intelligent startup control method for a high-power fire water pump according to claim 2 is characterized in that: In the 1# fire water pump control circuit, the first 1KA relay normally open contact is connected in parallel between the mark point 113 and the mark point 115, and a 1SA main switch is added between the mark point 115 and the neutral line N. Terminals 1 and 3 of the 1SA main switch are both connected to the mark point 115, terminal 2 is connected to the neutral line N after passing through the KA1 coil, terminal 4 is connected to the neutral line N after passing through the 1KA relay coil, and pin 4 is connected to the neutral line N after passing through the 2KA relay normally closed contact and the 6KA relay coil; after the travel switch SLC1 is connected in parallel with the first 5KA relay normally open contact, one end is connected to the terminal 4 of the 1SA main switch, and the other end is connected to the neutral line N after passing through the 5KA relay coil; at the same time, both ends of the travel switch SLC1 are connected to terminals 12 and 14 of the 1# electric actuator; Add a second 5KA relay normally open contact between terminals 9 and 10 of the 1# pump soft starter. Connect terminal 2 to the neutral line N through the second 1KA relay normally open contact and the 2KA relay coil. Connect a third 1KA relay normally open contact in parallel between points 139 and 141. One end of the normally open contact of the 6KA relay and the normally open contact of the 2KA relay are both connected to terminal 7 of the 1# electric actuator, the other end of the normally open contact of the 6KA relay is connected to terminal 8 of the 1# electric actuator, and the other end of the normally open contact of the 2KA relay is connected to terminal 9 of the 1# electric actuator.

4. The intelligent startup control method for a high-power fire water pump according to claim 3 is characterized in that: In the 2# fire water pump control circuit, the normally open contact of the first 3KA relay is connected in parallel between the marked point 213 and the marked point 215, and a 2SA main switch is added between the marked point 215 and the neutral line N. Terminals 1 and 3 of the 2SA main switch are both connected to the marked point 215, terminal 2 is connected to the neutral line N after passing through KA4, terminal 4 is connected to the neutral line N after passing through the 3KA relay, and terminal 4 is connected to the neutral line N after passing through the normally closed contact of the 4KA relay and the 8KA relay coil; After the limit switch SLC2 is connected in parallel with the normally open contact of the first 7KA relay, one end is connected to terminal 4 of the 2SA master switch, and the other end is connected to the neutral line N after passing through the 7KA relay coil; the two ends of the limit switch SLC2 are connected to terminals 12 and 14 of the 2# electric actuator; Add a second 7KA relay normally open contact between terminals 9 and 10 of the 2# pump soft starter. Connect terminal 2 to the neutral line N after passing through the second 3KA relay normally open contact and the 4KA relay. Connect a third 3KA relay normally open contact in parallel at points 239 and 241. One end of the normally open contact of the 8KA relay and the normally open contact of the 4KA relay are both connected to terminal 7 of the 2# electric actuator, the other end of the normally open contact of the 8KA relay is connected to terminal 8 of the 2# electric actuator, and the other end of the normally open contact of the 4KA relay is connected to terminal 9 of the 2# electric actuator.

5. The intelligent startup control method for a high-power fire water pump according to claim 4 is characterized in that: A 1KA relay normally closed contact is connected in series between the marking points 17 and 17- of the fire water supply pump common control circuit, and a 3KA relay normally closed contact is connected in series between the marking points 21 and 21-.

6. The intelligent startup control method for a high-power fire water pump according to claim 5, characterized in that: The process of automatic starting of the No. 1 fire water pump is as follows: (1) When the fire water pipe network pressure is ≤0.3Mpa, the fire linkage switch K point is closed, the relay KA12 is energized, and the output starts the fire water pump signal; (2) SA1 is in the automatic position, the 1SA master switch is in the valve automatic position, the three 1KA relay normally open contacts are closed and self-holding, and the 1# fire water supply pump automatically runs; at the same time, SA2 is in the manual position, the 2SA master switch is in the valve automatic position, and the 2# fire water supply pump is in manual operation standby state; (3) The 1KA relay is energized, and the 6KA relay is energized and closed through the 1SA master switch, and the 1# electric valve executes the closing command; (4) After the 1# electric valve is fully closed, the travel switch SLC1 is automatically closed; (5) The normally open contact of the second 5KA relay closes, and the soft starter of pump 1# starts automatically; (6) After the 1# pump soft starter is started, the bypass contactor KM1 works, the normally open contact of the 2KA relay closes, and the 1# electric valve performs the valve opening action until the valve automatically opens to 100%.

7. The intelligent startup control method for a high-power fire water pump according to claim 5, characterized in that: The process of automatic starting of the 2# fire water pump is as follows: (1) When the fire water pipe network pressure is ≤0.3Mpa, the fire linkage switch K point is closed, the relay KA12 is energized, and the output starts the fire water pump signal; (2) SA1 is in the manual position, the 1SA master switch is in the valve automatic position, and the 1# fire water supply pump is in manual operation standby state; at the same time, SA2 is in the automatic position, the 2SA master switch is in the valve automatic position, the three 3KA relay normally open contacts are energized and closed, and the 2# fire water supply pump automatically operates; (3) The 3KA relay is energized, and the 8KA relay is energized and closed through the 2SA master switch, and the 2# electric valve executes the closing command; (4) After the 2# electric valve is fully closed, the travel switch SLC2 is automatically closed; (5) The normally open contact of the second 7KA relay closes, and the soft starter of pump 2 starts automatically; (6) After the 2# pump soft starter is started, the bypass contactor KM2 works, the normally open contact of the 4KA relay closes, and the 2# electric valve performs the valve opening action until the valve automatically opens to 100%.

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