CN206800507U - Constant pressure water supply system - Google Patents

Abstract

A constant pressure water supply system, comprising: a human-computer interaction terminal, used to set control parameters and display the operating status of the constant pressure water supply system; an integrated controller, connected to the human-computer interaction terminal, used to The network pressure sends a control command to the frequency converter; the frequency converter is connected to the integrated controller, and is used to adjust the speed of the water pump in the water pump unit according to the control command of the integrated controller; the water pump unit includes at least one water pump; the pipe The network is connected to each water pump in the water pump unit, the pool and the water supply end of the user; the pressure transmitter is connected to the pipe network and the integrated controller, and is used to obtain the pressure of the pipe network and feed back the pressure of the pipe network to the Integrated controller. The above-mentioned constant-pressure water supply system realizes automatic pressure regulation, has a high degree of integration, and is more convenient to control.

Description

Constant pressure water supply system

technical field

The utility model relates to the field of automatic control, in particular to a constant pressure water supply system.

Background technique

With the development of our country's social economy, the continuous deepening of the housing system reform, the continuous improvement of people's living standards, the rapid development of urban construction, but also put forward higher requirements for infrastructure construction. The construction of urban water supply system is one of the important aspects. The reliability, stability and economy of water supply directly affect the normal work and life of users, and also directly reflect the level of water supply management. The traditional water supply methods generally have the disadvantages of wasting water power and electric power resources to varying degrees; low efficiency, poor reliability, and low degree of automation, which seriously affect residential and industrial water use. With the development of frequency conversion technology and the continuous improvement of people's requirements for the quality of drinking water, the frequency conversion constant pressure water supply system is widely used in the life, fire water supply. The variable frequency constant pressure water supply speed control system can realize the stepless speed regulation of the pump motor, automatically adjust the operating parameters of the system according to the change of water consumption, and keep the water pressure constant to meet the water demand when the water consumption changes. It is the most advanced and reasonable nowadays. One of the most energy-saving water supply systems.

Constant pressure water supply is gradually developed after the development of frequency conversion speed regulation technology. In the early days, the functions of frequency converters produced abroad were mainly limited to frequency control, speed up and down control, forward and reverse control, starting and braking control, voltage-frequency ratio control and various protection functions. Applied in the frequency conversion constant pressure water supply system, the frequency converter is only used as the actuator. In order to meet the different water supply requirements and ensure the constant pressure of the pipe network, a pressure controller and pressure sensor must be provided outside the frequency converter to perform closed-loop control of the pressure. In the early design of foreign constant pressure water supply projects, one frequency converter is used to drive only one water pump unit, and it is almost impossible to use one frequency converter to drive multiple water pump units to run, so the investment cost is high. With the development of frequency conversion technology and the advantages of stability, reliability and high degree of automation of the frequency conversion constant pressure water supply system and the remarkable energy saving effect were discovered and recognized by everyone, many foreign manufacturers of frequency converters began to pay attention to and launched constant pressure water supply systems. Although the frequency converter with pressure water supply function miniaturizes the circuit structure and reduces the equipment cost, the expansion function of its output interface lacks flexibility, the dynamic performance and stability of the system are not high, and it is difficult to compare with other monitoring systems and configuration software. Data communication is realized, and the capacity with load is limited, so its range will be limited in actual use.

The frequency conversion constant pressure water supply system is currently developing towards integration and simplification of maintenance and operation. At home and abroad, the integration of frequency converters for water supply is getting higher and higher. At the same time, the maintenance operation is becoming simpler and obviously higher, and the maintenance cost is also higher than that of domestic products. At present, many companies in China are engaged in the development and promotion of frequency conversion and constant pressure water supply. Domestic frequency converters are mainly assembled with imported components or directly imported from foreign frequency converters. In the field of frequency conversion water supply with small capacity and control requirements, domestic frequency converters develop rapidly. And it has occupied a considerable part of the small-capacity frequency conversion constant pressure water supply market with its low cost advantage. At present, in the research and design of frequency conversion speed regulation constant pressure water supply control system at home and abroad, the water pressure closed-loop control research of frequency conversion constant pressure water supply system that can adapt to different water situations and combine modern control technology, network, communication technology and human-computer interaction Not enough. Therefore, further research is needed to improve the performance of the variable frequency constant pressure water supply system so that it can be better applied to life and production practices.

Utility model content

The technical problem to be solved by the utility model is to provide a constant pressure water supply system, improve the integration of the constant pressure water supply system, and make the control more convenient.

In order to solve the above problems, the utility model provides a constant pressure water supply system, including: a human-computer interaction terminal for setting control parameters and displaying the operating status of the constant pressure water supply system; The connection is used to send control instructions to the frequency converter according to the control parameters and pipe network pressure; the frequency converter is connected to the integrated controller and used to adjust the speed of the water pump in the water pump unit according to the control instructions of the integrated controller; the water pump The unit includes at least one water pump; the pipe network is connected to each water pump in the water pump unit, the pool and the water supply end of the user; the pressure transmitter is connected to the pipe network and the integrated controller to obtain the pressure of the pipe network and The pipe network pressure is fed back to the integrated controller.

Optionally, it also includes: a contactor, the contactor is arranged between the frequency converter and the water pump unit, connected to the frequency converter and the water pump unit, and connected to the integrated controller, for instructions to control the start or stop of each water pump in the water pump unit.

Optionally, a liquid level sensor is also included, and the liquid level sensor is connected with the integrated controller for detecting the liquid level in the pool.

Optionally, the water pump unit includes at least one first water pump and at least one second water pump, and the power of the first water pump is greater than the power of the second water pump.

Optionally, the integrated controller includes a proportional-integral-derivative controller and a programmable controller.

Optionally, the integrated controller includes a timing unit for recording the time of a single operation of each water pump.

Optionally, the human-computer interaction terminal, controller, and frequency converter are all integrated in the control cabinet, and the panel of the control cabinet is provided with: the start button of each water pump in the water pump unit, the fault alarm signal light and the three-position The self-locking key button, the three-position self-locking key button includes three positions: manual, stop and automatic.

Optionally, a communication module is also included, including a serial port communication interface, an Ethernet communication interface and a wireless communication unit, for communicating with the human-computer interaction terminal, host computer, remote control room or user terminal.

Optionally, the pipe network section between the water pump unit and the pool is provided with a butterfly valve, and the pipe network section from the water pump unit to the user water supply end is sequentially provided with a check valve, a shock absorber throat and a butterfly valve; An air bag pressure tank is also connected to the side of the pipe network close to the user water supply end; a butterfly valve is arranged between the pressure transmitter and the pipe network.

Optionally, a water pump protector is also included to connect the water pump unit and the human-computer interaction terminal.

The constant pressure water supply system of the utility model can freely set the constant pressure value of the system through the human-computer interaction terminal, and the system automatically adjusts the speed of the water pump motor and the number of units put into operation according to the pressure set by the user, so that the equipment operates at the most efficient and energy-saving state. good condition. The control hardware is integrated in the controller, the system integration is higher, and it is more suitable for different water use occasions, and combines modern control technology, network, communication technology and human-computer interaction technology. The system has excellent performance, flexible control mode, strong anti-interference ability, and long-term reliable and stable operation.

Description of drawings

Fig. 1 is the structural representation of the constant pressure water supply system of a specific embodiment of the present utility model;

Fig. 2 is a schematic structural view of a constant pressure water supply system in a specific embodiment of the present invention;

Fig. 3 is a schematic structural view of a constant pressure water supply system according to a specific embodiment of the present invention;

Fig. 4 is a schematic diagram of the pipe network connection when the water pump unit of the constant pressure water supply system includes a plurality of water pumps in a specific embodiment of the present invention;

Fig. 5 is a schematic diagram of the appearance and structure of the control cabinet of the constant pressure water supply system according to a specific embodiment of the present invention;

Fig. 6a is a schematic side view of a constant pressure water supply system according to a specific embodiment of the present invention;

Fig. 6b is a schematic top view of a constant pressure water supply system according to a specific embodiment of the present invention.

detailed description

The specific implementation of the constant pressure water supply system provided by the utility model will be described in detail below in conjunction with the accompanying drawings.

Please refer to FIG. 1 , which is a schematic structural diagram of a constant-pressure water supply system according to a specific embodiment of the present invention.

The constant pressure water supply system includes: a human-computer interaction terminal 101 , an integrated controller 102 , a frequency converter 103 , a water pump unit 104 , a pipe network 105 and a pressure transmitter 106 .

The human-computer interaction terminal 101 is used to set control parameters and display the running status of the constant pressure water supply system. In a specific embodiment of the present utility model, the human-computer interaction terminal 101 includes a touch screen and a processor, which can display various monitoring parameters of the water supply system in real time, set system parameters on the spot, and display status information and alarm information in real time . When operating on the spot, the operator can accurately grasp the equipment status at any time and avoid mistakes, which is beneficial to maintenance. The display screen of the human-computer interaction terminal 101 includes: a start-up screen, which is the initial interface of the man-machine interface, and is the main menu screen of the system; a running screen, which is used to display the operating conditions of the water pump in real time, the current frequency conversion operation of the water pump, Current power frequency running water pump, variable frequency running frequency, real-time monitoring of water supply pressure, etc.; parameter setting screen, used to set relevant parameters of the water supply system, such as setting the default value of pipe network pressure, water pump cycle rotation time, daytime operation mode and nighttime The operating parameters and demarcation points of the operating mode, etc.; the operation information record screen is used to record the running status of the water pump; the alarm information record screen is used to record the operation alarm information of the water supply system, including the fault status of each water pump, and the water supply pressure is high or low. Low, airbag pressure is high and low, inverter failure and other information. For remote control signals and water-cooling system alarm signals that require high real-time performance, the water-cooling system communicates with the host computer monitoring workstation through hard contacts, and the human-computer interaction terminal 101 is also used to send operating status and fault status hard contacts to the host computer. Signal. Moreover, the operation authority can be set for the parameter setting function of the human-computer interaction terminal 101, so as to prevent the system from being unable to supply water normally due to arbitrariness of personnel with wrong operation authority.

The integrated controller 102 is connected with the human-computer interaction terminal 101, and is used to send control instructions to the frequency converter according to control parameters and pipe network pressure. The integrated controller 102 has a logic control circuit. In a specific embodiment of the present invention, the integrated controller 102 includes a proportional-integral-derivative controller (PID controller) and a programmable controller. The instruction code programs the integrated controller 102 to realize the functions of the electric control system such as PID. By modifying the instruction code, it can adapt to the control requirements of different water use occasions. In a specific embodiment of the present invention, the integrated controller 102 also reserves corresponding input and output interfaces, which can be used for secondary development and meet the requirements of different processes on site. In a specific embodiment of the present utility model, the integrated controller 102 also includes a timing unit for recording the single running time of each water pump, and for controlling the start and stop of each water pump in the water pump unit 104 in a cyclical rotation.

The frequency converter 103 is connected with the integrated controller 102, and is used to adjust the speed of the water pump in the water pump unit 104 according to the control instruction of the integrated controller 102.

In the constant pressure water supply system, the frequency converter 103 controls the frequency conversion and speed regulation of the water pump, thereby changing the water output flow of the water pump to achieve the purpose of constant pressure water supply. When the water pump is under speed control, the relationship among flow Q, head H and shaft power P is: Q∝n, H∝n ² , H∝n ³ , where n is the speed of the water pump. Since the shaft power is proportional to the cube of the pump speed, as the pump speed decreases, the shaft power will drop substantially in the form of the cube root. Therefore, the water supply system can fully save energy through the frequency conversion speed regulation of the water pump. According to the characteristic curve of the water pump, when the power frequency is running, if the flow rate increases, the head will decrease. When the user uses water, the change of water consumption will continuously cause the fluctuation of the water pressure of the pipe network. The ideal water supply requirements can be achieved by using the frequency conversion constant pressure water supply system, so that the pressure of the water supply is constant, and at the same time it has energy-saving effects. The frequency converter 103 adjusts the water pressure in the pipe network 105 through frequency conversion and speed regulation of the water pump in the water pump unit 104, so that the water pressure of the pipe network meets the set requirements.

The water pump unit 104 includes at least one water pump. In a specific embodiment of the present utility model, the water pump unit 104 includes more than two water pumps. Further, in order to improve the accuracy of water pressure adjustment, the water pump unit 104 includes at least one first water pump and at least one second water pump, the power of the first water pump is greater than the power of the second water pump.

The pipe network 105 is connected to each water pump in the water pump unit 104, the water pool and the user water supply end. The water pressure in the pipe network 105 is required to be stable during the constant-pressure water supply process, and does not change with the change of water consumption.

The pressure transmitter 106 is connected to the pipeline network 105 and the integrated controller 102 , and is used to acquire the pipeline network pressure and feed back the pipeline network pressure to the integrated controller 102 . The pressure transmitter 106 monitors the pipe network pressure in real time and feeds it back to the integrated controller 102. fixed value to form a control command to the frequency converter 103, adjust the speed of each water pump in the water pump unit 104 through the frequency converter 103, thereby changing the pressure in the pipe network 105, forming a closed-loop control system, automatically adjusting the pressure of the pipe network, and maintaining the system pressure constant.

Specifically, in a specific embodiment of the present invention, the operator can set the pressure required by the user through the human-computer interaction terminal 101, that is, the preset value of the pipe network pressure, which is monitored in real time by the integrated controller 102 through the pressure transmitter When the output pressure of the pipe network 105 is lower than the pressure required by the user, the integrated controller 102 automatically controls the start of the frequency converter 103 to adjust the speed of the water pump in the water pump unit 104 . Until the pressure of the pipe network rises to the user's set pressure value, the water pump is controlled to maintain a constant pressure of the pipe network at a certain speed. When the water consumption increases, the speed increases, and when the water consumption decreases, the speed decreases. When the water consumption is relatively large, if the first water pump runs at full speed and full power with frequency conversion, which cannot meet the operating pressure requirements, the control system will automatically switch the first water pump with frequency conversion to power frequency operation, and then put the second water pump into frequency conversion operation. , and so on, round-robin operation. When the user's water consumption decreases, the system will detect in real time and reduce the speed of the frequency conversion pump. If the speed of the frequency conversion pump drops to the lower limit and the water supply pressure is still high, the control system will automatically stop the first commercial frequency pump put into operation. Continue the frequency conversion operation constant pressure control, the principle of exiting the power frequency pump is first to switch on and then out, until all the power frequency pumps are stopped, and one variable frequency pump is kept running. The user can realize the above-mentioned control rules by coding the integrated controller 102, and can also realize other control rules.

In the specific implementation of the present utility model, the user can also set the control rules for the water pump unit in the daytime mode, nighttime mode and sleep state, and the time period of each mode can be set on the human-computer interaction terminal 101 . When the system is running during the day, when the water consumption is large, the principle of running the large pump first and then assisting the small pump is adopted; when the system operates at night, when the water consumption is small, the small pump is operated first and then the large pump is assisted principle operates. When the water consumption at night is almost zero, it can be set to sleep and stop running. After the user uses water, the pressure drops and the water pump restarts to maintain the water supply pressure. The system program sets that when the water consumption is reduced to a certain amount, the small pump will maintain the system operation. When the water consumption increases and the work of the small pump cannot be satisfied, the corresponding large pump will be put into operation. The power of the above-mentioned large pump is greater than that of the small pump. In the dormant state, when the water supply of the system is zero at night, the small pump operates with frequency conversion to maintain the system water supply pressure. The mode is automatically switched smoothly, reducing the impact on the power grid when switching, and the energy-saving efficiency and constant-pressure water supply function are better.

According to the preset value of the pipe network force set by the human-computer interaction terminal 101, the speed of the water pump motor and the number of units put into operation can be automatically adjusted through the integrated controller 102 and the frequency converter 103, so that the equipment can run in the best state of high efficiency and energy saving, and The inverter 103 is used to start cycle to reduce the impact on the power grid during water hammer and switching. The cycle rotation time of the water pumps can be set through the human-computer interaction terminal 101, so that the running time of each water pump is basically balanced, and the running time of a single water pump is prevented from being too long, thereby prolonging the service life of the water pumps.

Please refer to FIG. 2 , which is a schematic structural diagram of a constant-pressure water supply system according to another embodiment of the present invention.

The constant pressure water supply system further includes: a contactor 201 and a liquid level sensor 202 .

The contactor 201 is arranged between the frequency converter 103 and the water pump unit 104, connects the frequency converter 103 and the water pump unit 104, and is connected to the integrated controller 102, for according to the instructions of the integrated controller 102, The start or stop of each water pump in the water pump unit 104 is controlled.

The liquid level sensor 202 , the liquid level sensor 202 is connected with the integrated controller 102 , is used to be placed in the water supply pool, detects the liquid level in the pool, and feeds back to the integrated controller 102 . When the liquid level is lower than the minimum value, the integrated controller 102 stops the operation of the water pump or reduces the operation speed of the water pump.

In another specific embodiment of the present utility model, the constant pressure water supply system further includes a communication module, and the communication module includes a serial communication interface, an Ethernet communication interface and a wireless communication unit for communicating with the human-computer interaction terminal , upper computer, remote dispatching room or client end for communication.

In another specific embodiment of the present utility model, the constant pressure water supply system further includes a water pump protector connected to the water pump unit 104 and the man-machine interaction terminal 101 for monitoring the normal overheating, Information such as mechanical seal and humidity is communicated with the user through the human-computer interaction terminal 101, or sent to the remote dispatching room or the user's mobile terminal through the communication module.

Please refer to FIG. 3 , which is a schematic structural diagram of a constant-pressure water supply system according to a specific embodiment of the present invention.

The constant pressure water supply system sets the control parameters through the human-computer interaction terminal 301, and the integrated controller 302 monitors the pipe network pressure in real time, and sends a control command to the frequency converter 303 in combination with the pipe network pressure and the set control parameters, and the flattener 303 according to the control The command controls the working frequency of the water pumps in the water pump unit 304 . The pressure of the pipe network is obtained by the pressure transmitter 305 and a feedback signal of the pipe network pressure is sent to the integrated controller 302, so as to monitor the pressure of the pipe network. The water pool, the water pump unit 304 and the user water supply terminal 306 are connected through a pipe network.

In this specific embodiment, the pipe network section between the water pump unit 304 and the pool is provided with a butterfly valve D1, and the pipe network section from the water pump unit 304 to the user water supply end 306 is sequentially provided with check valves Z1, shock absorber throat B1 and butterfly valve D2. The pipe network is connected to an airbag pressure tank 307 near the user water supply end 306. A butterfly valve D4 is arranged between one end of the airbag pressure tank 307 and the pipe network, and a safety valve A1 is connected to the other end; A butterfly valve D3 is provided between the conveyor 305 and the pipe network. When it is detected that the pressure of the air bag pressure tank 307 reaches the upper limit value, the system will go into sleep mode and the water pump will stop running. When the pressure of the air bag pressure tank 307 is lower than the lower limit value, the water supply system will be awakened and the frequency conversion operation will start.

The liquid level sensor 308 is used to detect the water level in the pool, and sends a water shortage signal to the integrated controller 302 when the liquid level in the pool is lower than a limit value. The integrated controller 302 is also used to receive alarm and operation signals sent by the water pump protector or other monitoring equipment.

Please refer to FIG. 4 for a schematic diagram of pipe network connection when the water pump unit 304 includes multiple water pumps. The water pump unit includes 6 water pumps, respectively P1-P6, and butterfly valves D11-D16 are respectively provided at the pipe network ends connecting the 6 water pumps to the pool; Valves Z11-Z16, shock-absorbing throats B1-B6, butterfly valves D21-D26, and the water pumps are independent of each other.

In another specific implementation manner of the present utility model, the human-computer interaction terminal, the controller, the frequency converter, the communication module, etc. are all arranged in the control cabinet. Please refer to FIG. 5 , which is a schematic diagram of the appearance of the control cabinet of the constant pressure water supply system according to a specific embodiment of the present invention.

A touch screen 502 of a man-machine interaction terminal is arranged on the panel of the control cabinet 501 .

The panel of the control cabinet 501 is also provided with: a button 504 and a fault alarm signal lamp 503, the fault alarm signal lamp 503 can be buzzed and flashed, and the button 504 includes the start button of each water pump in the water pump unit and the three-position self-locking key Button, the three-position self-locking key button includes three positions: manual position, stop position and automatic position.

In the manual position, the water supply system is manually controlled, and other manual buttons in the control cabinet are valid, and the power frequency operation of each pump can be manually controlled. Manual operation is used for system debugging and special cases, and automatic operation is used for normal cases.

The water supply system is automatically controlled at the automatic position, and the water supply system runs automatically, and monitors the operation status of the water supply system and detects system failures according to the set parameters. The integrated controller automatically controls the frequency conversion operation of the water pumps in the water supply system according to the pressure setting value of the touch screen, controls the number of pumps invested, and realizes the goal of constant pressure water supply. The parameters of the water supply system exceed the standard, the water pump failure, the frequency converter failure, etc., display the alarm information in time and on the spot, and send the water supply system operation information to the upper computer. Other buttons of the control cabinet are invalid during automatic operation.

Cooling water temperature, system pressure, alarm information will be displayed in time when the parameters of the water cooling system exceed the standard; when the parameters are seriously exceeded and may affect the operation safety of the cooled device, it will automatically send out a water cooling system comprehensive failure or water cooling system comprehensive trip alarm. Other buttons of the control cabinet are invalid.

The water supply system is out of service at the stop position.

The control cabinet 501 also includes a connection end 505 for connecting to the water pump unit and various electrical interfaces.

Please refer to Figures 6a and 6b, which are schematic structural views of a constant-pressure water supply system according to a specific embodiment of the present invention, Figure 6a is a side view, and Figure 6b is a schematic top view.

The constant pressure water supply system includes a control cabinet 501, which integrates a man-machine interaction terminal, a controller, a frequency converter and the like.

The constant pressure water supply system further includes two sets of water pumps, namely a first water pump 601a and a second water pump 601b, and the power of the first water pump 601a is smaller than that of the second water pump 601b.

The constant pressure water supply system also includes an air bag pressure tank 602 and a pipe network 603 .

The above constant pressure water supply system can freely set the constant pressure value of the system through the human-computer interaction terminal. The system automatically adjusts the speed of the water pump motor and the number of units put into operation according to the pressure set by the user, so that the equipment can run in the best state of high efficiency and energy saving. The control hardware is integrated in the controller, the system integration is higher, and it is more suitable for different water use occasions, and combines modern control technology, network, communication technology and human-computer interaction technology. The system has excellent performance, flexible control mode, strong anti-interference ability, and long-term reliable and stable operation. It can be started in a cycle, and the pressure in the switching process is too stable. The operation mode of the frequency converter is used to reduce the impact on the power grid during water hammer and switching. Make the running time of each water pump basically balanced, avoid a single water pump running too long, and prolong the service life of the water pump. The constant pressure water supply system is divided into night mode and day mode, and the two modes are automatically switched. The principle of priority for large pumps is adopted during daytime operation, and the principle of priority for small pumps is adopted during night operation. The dividing point between night and day can be set through human-computer interaction equipment. The automatic switching between the two modes is stable, reducing the impact on the power grid when switching, and the energy-saving efficiency and constant-pressure water supply function are better.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. It should be regarded as the protection scope of the present utility model.

Claims (10)

1. A kind of 1. constant pressure water supply system, it is characterised in that including：

   Human-computer interaction terminal, for setting control parameter, display constant pressure water supply system running status；

   Integrated manipulator, it is connected with the human-computer interaction terminal, for sending and controlling to frequency converter according to control parameter, ductwork pressure System instruction；

   Frequency converter, it is connected with the integrated manipulator, for the control instruction according to the integrated manipulator,

   Adjust the rotating speed of water pump in water pump assembly；

   Water pump assembly, including an at least water pump；

   Pipe network, connect each water pump, pond and user's water supply end in water pump assembly；

   Pressure transmitter, the pipe network and the integrated manipulator are connected, for obtaining ductwork pressure and by the ductwork pressure Feed back to the integrated manipulator.
2. 2. constant pressure water supply system according to claim 1, it is characterised in that also include：Contactor, the contactor are set Between frequency converter and water pump assembly, the frequency converter and water pump assembly are connected, and is connected to the integrated manipulator, is used for According to the instruction of the integrated manipulator, starting or stoping for each water pump in the water pump assembly is controlled.
3. 3. constant pressure water supply system according to claim 1, it is characterised in that also passed including liquid level sensor, the liquid level Sensor is connected with the integrated manipulator, for detecting the liquid level in pond.
4. 4. constant pressure water supply system according to claim 1, it is characterised in that the water pump assembly includes at least one first Water pump and at least one second water pump, the power of first water pump are more than the power of second water pump.
5. 5. constant pressure water supply system according to claim 1, it is characterised in that the integrated manipulator include proportional, integral- Derivative controller and programmable controller.
6. 6. constant pressure water supply system according to claim 1 or 5, it is characterised in that it is single that the integrated manipulator includes timing Member, for recording the time of every water pump single operation.
7. 7. constant pressure water supply system according to claim 1, it is characterised in that the human-computer interaction terminal, controller, frequency conversion Device is integrated in switch board, is provided with the panel of the switch board：The start button of each water pump in the water pump assembly, Failure alarm signal lamp and three positions from lock key button, three position from lock key button include manually, stop, automatic Three positions.
8. 8. constant pressure water supply system according to claim 1, it is characterised in that also including communication module, including serial communication Interface, ethernet interface and wireless communication unit, for the human-computer interaction terminal, host computer, remote scheduling room Or user terminal is communicated.
9. 9. constant pressure water supply system according to claim 1, it is characterised in that the pipe network between the water pump assembly and pond Section is provided with butterfly valve, and check-valves, shock-absorbing are disposed with from the water pump assembly to the pipe network section between user's water supply end Larynx and butterfly valve；The pipe network is also associated with a gasbag pressure tank close to user's water supply end side；The pressure transmitter Butterfly valve is provided between the pipe network.
10. 10. constant pressure water supply system according to claim 1, it is characterised in that also including water pump protector, connect the water Pump assembly and human-computer interaction terminal.