Mechanical emergency star-delta starting device for fire pump

Abstract

The utility model discloses a mechanical emergency star-delta starting device for a fire pump, which comprises a fire pump control device connected with a fire pump control circuit, and an emergency starting device connected with the fire pump control circuit, a main circuit connector and a conversion circuit connector of the fire pump control device are respectively connected with a wiring terminal board of the fire pump group; and the emergency starting device is connected with the main circuit connector and the conversion circuit connector. Compared with the prior art, the fire-fighting water pump control device and the emergency starting device are arranged in the fire-fighting water pump control circuit in parallel, so that when the control circuit in the fire-fighting water pump control device breaks down, mechanical emergency pump starting in the emergency starting device can be achieved through one-time operation, and manual secondary operation is not needed; and a Y-voltage-reduction pump starting function is realized through the emergency starting device, and the influence on the voltage of a power supply system is reduced, so that the reliability of other fire-fighting loads is guaranteed.

Description

Technical Field

[0001] The utility model relates to the fields of building electricity and building water supply and drainage, and particularly relates to a mechanical emergency star-delta starting device for a fire pump. Background Technique

[0002] When a high-power motor starts, a starting current 4 to 7 times the rated current will be generated, which will cause a large voltage drop on the line in a short time. This not only affects the starting of the motor itself, but also affects the normal operation of other motors and electrical equipment on the same line. To prevent this situation, reduced voltage starting is adopted. Among the reduced voltage starting methods for fire pumps, the most common one is star-delta reduced voltage starting.

[0003] Article 3.0.12 of the General Specification for Fire Protection Facilities GB55036-2022 requires that the fire pump control cabinet shall have an emergency mechanical pump starting function. The traditional emergency mechanical pump starting devices for fire pumps are divided into two types: the first is a one-time emergency mechanical pump starting, which directly short-circuits the main circuit and the running circuit, so that the water pump is connected to the power supply without passing through the control components to realize the starting of the water pump; the second is a two-time emergency mechanical pump starting. In the first step, the main circuit and the Y starting circuit are short-circuited. In the second step, after a certain time, the △ running circuit is short-circuited and the Y starting circuit is disconnected. The first one is the simplest and most common emergency mechanical pump starting device for fire pumps, belonging to a direct starting scheme. However, for a fire pump that requires star-delta reduced voltage starting, changing from the reduced voltage starting method to direct starting generates a large starting current, which may cause a large voltage drop and affect the normal operation of other fire loads on the same line. For the second scheme, although star-delta starting can be realized, it is operated in two steps, and it is impossible to effectively control the switching interval time of the two steps and the Y-△ conversion operation steps in a complex situation. Content of the Utility Model

[0004] The purpose of the utility model is to provide a mechanical emergency star-delta starting device for a fire pump. The technical problem to be solved is to realize the mechanical emergency pump starting in a high-power fire pump emergency starting device with one operation, reduce the impact on the voltage of the power supply system, and ensure the reliability of other fire loads.

[0005] To solve the above problems, the utility model is realized by adopting the following technical solutions: A mechanical emergency star-delta starting device for a fire pump includes a fire pump control device connected to the fire pump control circuit, and also includes an emergency starting device connected to the fire pump control circuit. The main circuit connector and the conversion circuit connector of the fire pump control device are respectively connected to the terminal board of the fire pump group, and the emergency starting device is connected to the main circuit connector and the conversion circuit connector.

[0006] Further, the emergency start-up device includes an emergency start-up circuit breaker and an automatic transfer switch connected to the control circuit of the fire pump. The automatic transfer switch has a standby power supply connector and a main power supply connector. The output end of the emergency start-up circuit breaker is divided into two paths. One path is connected to the main circuit connector, and the other path is respectively connected to the standby power supply connector. The automatic transfer switch is also connected to the conversion circuit connector. Under normal conditions, the emergency start-up circuit breaker is in the off state, and the main power supply connector is in the closed state. When the emergency start-up circuit breaker and the main power supply connector are closed, the Y-circuit start-up function of the fire pump group is realized. When the automatic transfer switch is switched to the closed state of the standby power supply connector, the △-circuit start-up function of the fire pump group is realized.

[0007] Further, the automatic transfer switch adopts a time-delay automatic transfer switch with a time-delay function. The conversion delay time between the main power supply connector and the standby power supply connector is 15 - 30 s.

[0008] Compared with the prior art, the present utility model realizes that when a fault occurs in the control circuit in the fire pump control device, the mechanical emergency start-up of the emergency start-up device can be realized through one operation without manual secondary operation by paralleling the fire pump control device and the emergency start-up device in the fire pump control circuit. The Y-△ step-down start-up function is realized through the emergency start-up device, reducing the impact on the voltage of the power supply system, thereby ensuring the reliability of other fire loads. Description of the Drawings

[0009] Figure 1 is the connection schematic diagram of the present utility model.

[0010] Figure 2 is the internal wiring diagram of the emergency start-up device of the present utility model and the main circuit diagram formed with the water pump. Detailed Embodiment

[0011] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0012] As Figure 1 shown, the present utility model discloses a mechanical emergency star-delta start-up device for a fire pump, including a fire pump control device 1 connected to the fire pump control circuit and an emergency start-up device 2 connected to the fire pump control circuit. The fire pump control device 1 is provided with a main circuit connector 131 and a conversion circuit connector 132. The main circuit connector 131 and the conversion circuit connector 132 are respectively connected to the terminal board of the fire pump group 3, where:

[0013] In the present utility model, the fire pump control device 1 is realized by using a star-delta control device of the prior art, and no specific limitation is made here. The main improvement is the addition of the emergency start-up device 2. The specific structure of the emergency start-up device 2 will be described in detail below.

[0014] As Figure 2 shown, the emergency start device 2 includes an emergency start circuit breaker 201 and an automatic transfer switch 210. The automatic transfer switch 210 includes a standby power supply connector 211, a main power supply connector 212, and a load terminal. The input end of the emergency start circuit breaker 201 is connected to the main power supply line of the fire pump. The output end of the emergency start circuit breaker 201 is divided into two paths. One path is connected to the main circuit connector 131, and the other path is connected to the standby power supply connector 211. The load terminal of the automatic transfer switch 210 is connected to the conversion circuit connector 132. Under normal conditions, the emergency start circuit breaker 201 is in an open state, the main power supply connector 212 is in a closed state, and the standby power supply connector 211 is in an open state.

[0015] In the present utility model, the automatic transfer switch 210 is a time-delay automatic transfer switch with a time-delay function. The delay time of the automatic transfer switch 210 is 15 - 30 s, that is, the delay time for automatically switching from the main power supply connector 212 to the standby power supply connector 211 is 15 - 30 s, ensuring that the fire pump can have a Y-△ conversion time during mechanical forced start.

[0016] When a control circuit fault occurs in the fire pump control device 1 and the fire pump group 3 cannot be started by the main circuit contactor 111, the △ operation circuit contactor 112, and the Y start circuit contactor 113, a person with management authority closes the emergency start circuit breaker 201 to connect the power supply and short-circuit the fire pump control device 1. At this time, the start circuit breaker 201 and the main power supply connector 212 are in a closed state, realizing the Y circuit start state of the fire pump group 3, and at this time, the fire pump group 3 realizes the Y start state; when the delay time arrives, the automatic transfer switch 210 switches to the standby power supply connector 211 to be closed, thereby switching to the △ circuit start state of the fire pump group 3, and at this time, the fire pump group 3 realizes the △ operation state.

[0017] In the present utility model, one water pump can be provided in the fire pump group 3. When multiple water pumps are provided, it is only necessary to correspond the emergency start device to the water pump control device one by one.

[0018] The present utility model is used for the design of a mechanical emergency star-delta start device for a fire pump. Only by manually operating the emergency start circuit breaker, a mechanical emergency start pump method with Y-△ conversion can be realized without manual secondary operation. By mechanically emergency Y-△ step-down starting the pump, the influence on the voltage of the power supply system is reduced, thereby ensuring the reliability of other fire loads.

Claims

1. A fire pump mechanical emergency star-delta starting device, comprising a fire pump control device (1) connected to a fire pump control circuit, characterized in that: It also includes an emergency starting device (2) connected to the fire pump control circuit. The main circuit connector (131) and the conversion circuit connector (132) of the fire pump control device (1) are respectively connected to the terminal board of the fire pump group (3), and the emergency starting device (2) is connected to the main circuit connector (131) and the conversion circuit connector (132).

2. The fire pump mechanical emergency star-delta starting device according to claim 1 is characterized in that: The emergency starting device (2) comprises an emergency starting circuit breaker (201) connected to a fire pump control circuit, and an automatic switching switch (210). The automatic switching switch (210) has a backup power connector (211) and a main power connector (212). The output end of the emergency starting circuit breaker (201) is divided into two paths, one path is connected to the main circuit connector (131), and the other path is respectively connected to the backup power connector (211). The automatic switching switch (210) is also connected to the conversion circuit connector (132). Under normal conditions, the emergency starting circuit breaker (201) is in an open state, and the main power connector (212) is in a closed state. When the emergency starting circuit breaker (201) and the main power connector (212) are closed, the Y circuit pump starting function of the fire pump group (3) is realized. When the automatic switching switch (210) is switched to the backup power connector (211) and closed, the △ circuit pump starting function of the fire pump group (3) is realized.

3. The fire pump mechanical emergency star-delta starting device according to claim 2 is characterized in that: The automatic switching switch (210) adopts a delayed automatic switching switch with a time delay function, and the switching delay time between the main power supply connector (212) and the standby power supply connector (211) is 15 to 30 seconds.

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