Pump valve constant-pressure energy-saving switching device, control method, equipment, medium and product

Abstract

The invention discloses a pump valve constant-pressure energy-saving switching device, a control method, equipment, a medium and a product, and relates to the field of water supply and drainage energy conservation. The control system is connected with a pump set control cabinet and the water supply and drainage unit and used for controlling the opening state and the switching speed of a water pump anti-backflow energy-saving device in the water supply and drainage unit according to the pipe network pressure and the pump outlet pressure of the water supply and drainage unit. Switching of all water pumps in a pump set in the water supply and drainage unit is controlled according to the switching instruction; the pump set control cabinet is used for sending a switching instruction to the control system according to the running state of each water pump, and the water hammer effect can be avoided, and the system energy consumption and the maintenance complexity are reduced.

Description

Technical Field

[0001] The present application relates to the field of energy conservation for water supply and drainage, and in particular to a pump valve constant pressure energy conservation switching device, control method, equipment, medium and product. Background Art

[0002] In water supply and drainage equipment, the check valve (also known as non-return valve or one-way valve) is a key component in the water supply and drainage system. Its core function is to allow fluid to flow in one direction and prevent reverse flow. The following are the specific reasons and engineering significance of installing a check valve:

[0003] 1. Prevent fluid backflow and ensure system safety:

[0004] Scenario: When the water pump stops working, the water in the pipe may flow in the reverse direction due to gravity or pressure difference.

[0005] Risk: Backflow can cause the pump impeller to reverse and damage the equipment.

[0006] Function of check valve: Automatically close the valve to block reverse water flow.

[0007] 2. Avoid water hammer effect and protect pipelines:

[0008] Water hammer effect: When the water flow suddenly stops or reverses, the pressure in the pipe fluctuates violently, which may cause pipe rupture or equipment vibration.

[0009] Function of the check valve: By limiting the reverse flow rate, it can reduce water hammer impact and extend the life of pipelines and equipment.

[0010] 3. Maintain stable water supply and drainage pressure:

[0011] Scenario: In a multi-stage pump series or pipe network branch system, if a branch pump stops, the pressure imbalance will cause abnormal flow in other branches.

[0012] Function of the check valve: Isolate different pressure areas, ensure system pressure balance, and ensure normal water supply and drainage.

[0013] 4. Energy saving and reducing pump wear:

[0014] Backflow problem: If a check valve is not installed, the pump needs to be restarted frequently to compensate for the backflow loss, increasing energy consumption and mechanical wear.

[0015] Function of the check valve: reduce invalid circulation, reduce energy consumption and extend the service life of the water pump.

[0016] 5. Special scenario requirements:

[0017] Prevent media mixing: Avoid cross contamination of different liquids in chemical or medical water supply and drainage systems.

[0018] Water supply and drainage in high-rise buildings: Prevent water from high-rise water tanks from flowing back into low-rise pipes, causing overpressure in the low-rise areas.

[0019] However, when the check valve is closed quickly, the inertia of the water flow causes a sudden increase in pressure, generating a shock wave. Although the water hammer effect can be suppressed to a certain extent, it will still produce a water hammer effect, causing pipeline vibration and abnormal noise; the valve or pipeline interface is loose and broken; the pump bearing and other equipment components are damaged (especially the system with frequent start and stop); under certain working conditions, the check valve needs to be fully opened when the pump runs to a sufficiently large pressure, causing the pressure of the pipeline network to increase, increasing the risk of pipe burst, and affecting the stability and safety of water supply and drainage; when the check valve is damaged, the water pump will reverse, and when the water pump reverses, the water flow drives the impeller to rotate in the opposite direction, and the motor is transformed into a generator state, generating reverse current (regenerated electric energy). If the inverter is not equipped with a brake unit or energy feedback device, the reverse current will impact the inverter DC bus, causing overvoltage or component damage.

[0020] In addition, the internal structure of the check valve (such as spring and valve disc) causes local pressure loss. Impact scenarios include:

[0021] High-rise water supply and drainage requires higher head pumps to compensate for pressure loss; long-distance pipeline transportation efficiency is reduced; the "Building Water Supply and Drainage Design Code" mentions the relevant requirements for local head loss of pipeline backflow preventers. The local head loss value recommended in the code should be 2.5-4m, but the resistance of general products is around 7m, the maximum head loss may reach 8m, and the actual value is usually larger than the recommended value in the code.

[0022] And the maintenance complexity increases, as shown in Table 1.

[0023] Table 1

[0024] Maintenance Items Potential Problems Valve disc / spool stuck Impurity deposition causes poor closure or inability to return to position Spring fatigue Elasticity reduction leads to seal failure Sealing ring aging Water leakage or backflow

[0025] It can be seen that the solution of installing check valves in water supply and drainage equipment to save energy can still produce water hammer effect and cause pipeline damage, and the system energy consumption increases and the maintenance complexity is high. Summary of the invention

[0026] The purpose of this application is to provide a pump valve constant pressure energy-saving switching device, control method, equipment, medium and product to solve the problems of water hammer effect, high system energy consumption and high maintenance complexity.

[0027] To achieve the above objectives, this application provides the following solutions:

[0028] In a first aspect, the present application provides a pump valve constant pressure energy-saving switching device, comprising: a control system, a pump group control cabinet, and a water supply and drainage unit;

[0029] The control system is connected to the pump group control cabinet and the water supply and drainage unit, respectively, and is used to control the opening state and switching speed of the water pump backflow prevention energy-saving device in the water supply and drainage unit according to the pipe network pressure and pump outlet pressure of the water supply and drainage unit, and control the switching of each water pump in the pump group in the water supply and drainage unit according to the switching instruction;

[0030] The pump group control cabinet is used to send a switching instruction to the control system according to the operating status of each water pump.

[0031] In a second aspect, the present application provides a control method for a pump valve constant pressure energy-saving switching device, comprising:

[0032] Based on the above pump valve constant pressure energy-saving switching device, the pipe network pressure and the pump outlet pressure are obtained;

[0033] Determining whether the pipe network pressure is equal to the pump outlet pressure;

[0034] If so, continuously collect the pipe network pressure and the pump outlet pressure;

[0035] If not, control the opening state and switching speed of the water pump backflow prevention and energy-saving device in the water supply and drainage unit until the pipe network pressure is equal to the pump outlet pressure.

[0036] In a third aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the pump valve constant pressure energy-saving switching device described in any one of the above.

[0037] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the constant-pressure energy-saving switching device of a pump valve as described above.

[0038] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the control method of the pump valve constant pressure energy-saving switching device described in any one of the above.

[0039] According to the specific embodiments provided by the present application, the present application discloses the following technical effects: the present application controls the opening state and switching speed of the water pump anti-backflow energy-saving device in the water supply and drainage unit according to the pipeline pressure and pump outlet pressure of the water supply and drainage unit, thereby gradually shutting down the water pump anti-backflow energy-saving device to avoid excessive pressure in the pipe and water hammer effect when the water pump is directly shut down; in addition, the present application replaces the check valve with the water pump anti-backflow energy-saving device, thereby reducing system energy consumption and maintenance complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 This is a schematic diagram of the structure of the pump valve constant pressure energy-saving switching device provided in this application;

[0042] Figure 2 A schematic diagram of the structure of the water pump backflow prevention and energy-saving device provided in this application;

[0043] Figure 3 A flow chart of a control method for a pump valve constant pressure energy-saving switching device provided in this application;

[0044] Figure 4 Schematic diagram of the computer equipment provided for this application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0047] The present application provides a pump valve constant pressure energy-saving switching device, such as Figure 1 As shown, it includes: a control system, a pump group control cabinet 16 and a water supply and drainage unit.

[0048] The water supply and drainage unit includes a pump unit 1, a flexible connection 2, a pull rod 3, a water pump backflow prevention and energy-saving device 4, a flow meter 5, a flow meter housing extension section 6, a pressure sensor 7, a clamping flange 8, a flexible joint flange 9 and a water outlet pipe 10. A flexible connection 2 is provided between the flow meter 5 and the pump unit 1, and the flexible connection 2 is used to reduce vibration and correct the connection angle between the pump unit 1 and the water outlet pipe 10.

[0049] The control system includes an anti-backflow controller driving device 11, an uninterrupted power supply (UPS) 12, a programmable logic controller (PLC) 13, and a human-machine interface 14.

[0050] The pressure gauge 15 is arranged at the outlet of the pipe network and connected to the PLC 13 to collect the pressure of the pipe network.

[0051] The control system is connected to the pump group control cabinet 16 and the water supply and drainage unit, respectively, and is used to control the opening state and switching speed of the water pump backflow prevention and energy-saving device 4 in the water supply and drainage unit according to the pipeline pressure and pump outlet pressure of the water supply and drainage unit, and to control the switching of each water pump in the pump group 1 in the water supply and drainage unit according to the switching instruction; the pump group control cabinet 16 is used to send a switching instruction to the control system according to the operating status of each water pump.

[0052] In practical applications, the control system mainly includes a control cabinet housing, a human-machine interface 14 , a PLC 13 , a water pump backflow prevention and energy-saving device driving device 11 and a UPS power supply 12 .

[0053] The human-machine interface 14 is used to monitor the system status and set certain key parameters, such as pump outlet pressure, flow rate, and temperature.

[0054] PLC13 is mainly used to collect the pump outlet pressure and flow rate, and to control the anti-backflow controller drive device 11 according to the designed control logic through the collected system data. Among them, the control logic is: when the pump starts to run, the system detects the pipeline pressure and the pump outlet pressure, and when the pump outlet pressure is equal to the pipeline pressure, the anti-backflow energy-saving device is turned on to control the pipeline pressure without fluctuation; when the pump is ready to stop running, the system starts to slowly close the anti-backflow energy-saving device, and at the same time, the water pump starts to stop in an oblique wave, so that the pipeline pressure is always equal to the pump outlet pressure, to prevent the occurrence of water hammer effect. The switching speed of the anti-backflow energy-saving device (from fully open to fully closed and from fully closed to fully open) can be set in the human-machine interface 14.

[0055] The anti-backflow controller driving device 11 mainly sends driving instructions to PLC13, and sets the opening and closing time of the water pump anti-backflow energy-saving device 4 through the human-machine interface 14, and changes the voltage of the water pump anti-backflow energy-saving device 4 to drive the switching state and switching speed of the water pump anti-backflow energy-saving device 4.

[0056] The UPS power supply 12 is an optional structure, which is mainly used to drive the water pump anti-backflow energy-saving device 4 to open or close when the city power is cut off, so as to prevent the occurrence of water hammer effect or water backflow in the water pipe.

[0057] In an exemplary embodiment, the water supply and drainage unit specifically includes: a pump group 1, a pull rod 3 and a water outlet pipe 10 connected in sequence from bottom to top; the water pump anti-backflow energy-saving device 4 is arranged between the pull rod 3 and the water outlet pipe 10, and is used to control the fluid speed in the water outlet pipe 10 and the flow of the fluid; a flow meter 5 is provided in the pull rod 3; the flow meter 5 has a built-in pressure sensor 7; the pressure sensor 7 is used to collect the pump outlet pressure.

[0058] In practical applications, the water pump backflow prevention and energy saving device 4 is as follows Figure 2 As shown, it includes an actuator, a valve stem and a valve body; wherein the valve stem includes two sets of upper valve stem packing and lower valve stem packing connected in sequence; an O-ring is arranged between the upper valve stem packing and the lower valve stem packing, and the O-ring is used for sealing; the lower valve stem packing is connected to the valve body through the O-ring and connecting bolts; a butterfly plate is arranged on the valve body, and a valve seat sealing ring is arranged between the butterfly plate and the valve body.

[0059] In actual application, the actuator is connected to PLC13, and PLC13 sends control instructions to the actuator. The actuator controls the upper valve stem packing and the lower valve stem packing according to the control instructions to control the opening state and switching speed of the butterfly plate on the valve body.

[0060] In practical applications, the flow meter 5 is an electromagnetic or ultrasonic flow meter 5, which is used to detect the water flow rate of the pump.

[0061] In an exemplary embodiment, a flowmeter housing extension section is provided at the bottom end of the flowmeter 5 ; the flowmeter housing extension section is fixed to the flowmeter 5 via a clamping flange 8 and a flexible joint flange 9 .

[0062] In an exemplary embodiment, a pressure gauge 15 is provided at the outlet of the pipe network, and the pressure gauge 15 is used to collect the pressure of the pipe network.

[0063] In an exemplary embodiment, the control system specifically includes: a controller, and an anti-backflow controller driving device 11 and a human-machine interface 14 connected to the controller; the controller is connected to the pressure sensor 7 and the pressure gauge 15; the anti-backflow controller driving device 11 is used to send driving instructions to the controller to control the opening state and switching speed of the water pump anti-backflow energy-saving device 4; the human-machine interface 14 is used to display the collected pipeline pressure, pump outlet pressure and the opening state and switching speed of the water pump anti-backflow energy-saving device 4.

[0064] In practical applications, the anti-backflow controller driving device 11 can be a forward and reverse speed regulator, which is controlled by PLC13. PLC13 makes judgments by collecting data such as pressure and flow, and sends a DC-5V~+5V analog signal to the forward and reverse speed regulator. When the forward and reverse speed regulator receives the signal, it drives the water pump anti-backflow energy-saving device to open or close. For example, when PLC13 outputs -5V, the water pump anti-backflow energy-saving device is completely closed, when 0V, the water pump anti-backflow energy-saving device is half-open, and when 5V, the water pump anti-backflow energy-saving device is fully opened.

[0065] In practical applications, the water pump backflow prevention and energy-saving device 4 controls the on-off of the fluid in the pipeline. When opened, the ball channel is completely aligned with the pipeline diameter, avoiding the head loss caused by installing a check valve, and the adjustable closing speed avoids the occurrence of a water hammer effect.

[0066] In practical applications, the water pump backflow prevention and energy-saving device 4 can be a valve, such as a flat gate valve and a ball valve. This application chooses to use a valve to replace the check valve. The head loss of the valve in the fully open state is only 0.01-0.03m, which is close to the friction loss of the straight pipe section. However, the valve is usually unable to judge the opening and closing time of the valve by itself, and thus cannot play a check role. Because this application adds a control system to drive the valve, the control system collects the pump outlet pressure, outlet flow and pipe network pressure in real time, so as to judge the opening and closing time and the speed of the valve. At the same time, the anti-backflow controller driving device 11 has the function of opening and closing the valve and controlling the speed of the valve.

[0067] By controlling the valve driven by the control system, positive flow and positive pressure are achieved, and pump group 1 is switched and the valve is closed under double insurance, so as to eliminate the head loss and water hammer effect caused by the check valve.

[0068] The design core of all the hardware settings and software of this application is mainly to judge and drive the timing and switching speed of opening and closing the water pump anti-backflow energy-saving device 4, so as to ensure that the water pump anti-backflow energy-saving device 4 plays the check function of the check valve while not causing head loss, and at the same time prevent the occurrence of water hammer effect, so that the entire pump group 1 can be safely switched under the dual insurance of positive flow and positive pressure to ensure the safe and reliable operation of the pump group 1.

[0069] The present application embodiment provides a control method for a pump valve constant pressure energy-saving switching device, which is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the present application embodiment, Figure 3 As shown, the method includes the following steps.

[0070] S1: Based on the pump valve constant pressure energy-saving switching device, the pipeline network pressure and pump outlet pressure are obtained.

[0071] S2: Determine whether the pipe network pressure is equal to the pump outlet pressure. If so, execute S3; if not, execute S4.

[0072] S3: Continuously collect the pipe network pressure and the pump outlet pressure.

[0073] S4: Control the opening state and switching speed of the water pump backflow prevention and energy-saving device 4 in the water supply and drainage unit until the pipe network pressure is equal to the pump outlet pressure.

[0074] In practical applications, the judgment of the opening time and speed of the water pump anti-backflow energy-saving device 4 is:

[0075] When the control system detects that the pump outlet pressure rises, the water pump anti-backflow energy-saving device 4 is opened. The greater the pressure, the faster the opening speed. The speed and pressure relationship parameters of the water pump anti-backflow energy-saving device 4 can be set on the human-machine interface 14.

[0076] When the control system detects that the pump group 1 corresponding to the water pump backflow prevention and energy-saving device 4 is started, the water pump backflow prevention and energy-saving device 4 is turned on.

[0077] In an exemplary embodiment, S1 further includes:

[0078] S5: Under normal circumstances, when pump group 1 needs to cut off the pump operation, based on the operating status of the operating water pump, the standby water pump is started, and the water outlet pressure of the standby water pump is collected in real time.

[0079] S6: When the outlet water pressure of the standby water pump reaches the pipe network pressure, the oblique wave stops the running water pump, and controls the water pump anti-backflow energy-saving device 4 to perform a closing action until the running water pump stops, and the water pump anti-backflow energy-saving device 4 is in a fully closed state.

[0080] S7: Under abnormal circumstances, when a sudden fault occurs during the operation of the pump group 1, the pump group 1 is controlled to decelerate in an inclined wave, and the water pump anti-backflow energy-saving device 4 is controlled to perform a closing action until the pump group 1 stops, and the water pump anti-backflow energy-saving device 4 is in a fully closed state.

[0081] In practical applications, the judgment of the closing time and speed of the water pump anti-backflow energy-saving device 4 is as follows:

[0082] Under normal circumstances: when the pump group 1 needs to cut off the pump operation, in order to ensure that the pipe network pressure does not fluctuate, the running water pump is in the running state, and the standby water pump is started. When the water outlet pressure of the standby water pump reaches the pipe network pressure, the ramp stops the running water pump, and the water pump anti-backflow energy-saving device 4 performs the closing action until the running water pump stops and the water pump anti-backflow energy-saving device 4 is fully closed. Specifically, the ramp stop is to achieve ramp shutdown by slowly reducing the frequency and slowing down.

[0083] The whole unit is switched safely under the condition of positive flow and positive pressure double insurance to ensure the safe and reliable operation of pump unit 1. When shutting down, the closing speed of the anti-backflow energy-saving device is proportional to the frequency of the pump, that is, the faster the frequency of the pump decreases, the faster the closing speed.

[0084] Under abnormal conditions: when a sudden failure occurs during the operation of pump unit 1, the system detects and collects the network pressure and flow value through the pump unit 1's own pressure and flow meter 5, and the pressure and flow value are lower than 80% of the normal value and continue to decrease. The abnormal pump unit 1 starts to decelerate with an inclined wave, and the water pump backflow prevention and energy-saving device 4 performs a closing action until the abnormal pump unit 1 stops, and the water pump backflow prevention and energy-saving device 4 is fully closed. The entire unit is switched safely under the condition of positive flow and positive pressure double insurance to ensure the safe and reliable operation of the pump unit 1.

[0085] The present application is realized by integrating a water pump, a water pump backflow prevention and energy-saving device 4 , a detection device and a control system. The detection device includes a flow meter 5 , a pressure sensor 7 and a pressure gauge 15 .

[0086] The pressure sensor 7 and the flow meter 5 are located between the pump and the water pump backflow prevention and energy saving device 4 .

[0087] The entire pump unit 1 performs safety switching under the double insurance of positive flow and positive pressure to ensure the safe and reliable operation of the pump unit 1.

[0088] In an exemplary embodiment, a computer device is provided, such as Figure 4 As shown, the computer device can be a server or a terminal. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store control data of a pump valve constant pressure energy-saving switching device. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a control method for a pump valve constant pressure energy-saving switching device is implemented.

[0089] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the above method is implemented when the processor executes the computer program.

[0090] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, which implements the above method when executed by a processor.

[0091] In an exemplary embodiment, a computer program product is provided, including a computer program, which implements the above method when executed by a processor.

[0092] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ReadOnlyMemory, ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (Magnetoresistive RandomAccess Memory, MRAM), ferroelectric random access memory (Ferroelectric RandomAccess Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (RandomAccess Memory, RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0093] In this application, all actions to obtain signals, information or data are carried out in compliance with the relevant data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0094] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0095] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A pump valve constant pressure energy-saving switching device, characterized in that: The pump valve constant pressure energy-saving switching device comprises: a control system, a pump group control cabinet and a water supply and drainage unit; The control system is connected to the pump group control cabinet and the water supply and drainage unit, respectively, and is used to control the opening state and switching speed of the water pump backflow prevention energy-saving device in the water supply and drainage unit according to the pipe network pressure and pump outlet pressure of the water supply and drainage unit, and control the switching of each water pump in the pump group in the water supply and drainage unit according to the switching instruction; The pump group control cabinet is used to send a switching instruction to the control system according to the operating status of each water pump.

2. The pump valve constant pressure energy-saving switching device according to claim 1, characterized in that: The water supply and drainage unit specifically includes: a pump unit, a pull rod and a water outlet pipe connected in sequence from bottom to top; The water pump backflow prevention and energy-saving device is arranged between the pull rod and the water outlet pipe, and is used to control the fluid speed in the water outlet pipe and the on-off of the fluid; A flow meter is arranged inside the pull rod; a pressure sensor is built into the flow meter; and the pressure sensor is used to collect the pump outlet pressure.

3. The pump valve constant pressure energy-saving switching device according to claim 2, characterized in that: The bottom end of the flow meter is provided with a flow meter housing extension section; the flow meter housing extension section is fixed to the flow meter through a clamping flange and a flexible joint flange.

4. The pump valve constant pressure energy-saving switching device according to claim 3, characterized in that: A pressure gauge is provided at the outlet of the pipe network, and the pressure gauge is used to collect the pressure of the pipe network.

5. The pump valve constant pressure energy-saving switching device according to claim 4, characterized in that: The control system specifically includes: a controller, and an anti-backflow controller driving device and a human-machine interface connected to the controller; The controller is connected to the pressure sensor and the pressure gauge; The anti-backflow controller driving device is used to send a driving instruction to the controller to control the opening state and switching speed of the water pump anti-backflow energy-saving device; The human-machine interface is used to display the collected pipe network pressure, pump outlet pressure, and the opening state and switching speed of the water pump backflow prevention and energy-saving device.

6. A control method for a pump valve constant pressure energy-saving switching device, characterized in that: The control method of the pump valve constant pressure energy-saving switching device controls the pump valve constant pressure energy-saving switching device according to any one of claims 1 to 5, and the control method of the pump valve constant pressure energy-saving switching device comprises: Based on the pump valve constant pressure energy-saving switching device according to any one of claims 1 to 5, the pipe network pressure and the pump outlet pressure are obtained; Determining whether the pipe network pressure is equal to the pump outlet pressure; If so, continuously collect the pipe network pressure and the pump outlet pressure; If not, control the opening state and switching speed of the water pump backflow prevention and energy-saving device in the water supply and drainage unit until the pipe network pressure is equal to the pump outlet pressure.

7. The control method of the pump valve constant pressure energy-saving switching device according to claim 6 is characterized in that: Get the network pressure and pump outlet pressure, and then include: Under normal circumstances, when the pump group needs to cut off the pump operation, based on the operating status of the running water pump, the standby water pump is started, and the water outlet pressure of the standby water pump is collected in real time; When the outlet water pressure of the standby water pump reaches the pipe network pressure, the oblique wave stops the running water pump, controls the water pump backflow prevention and energy-saving device to perform a closing action, until the running water pump stops, and the water pump backflow prevention and energy-saving device is in a fully closed state; Under abnormal circumstances, when a sudden fault occurs during the operation of the pump group, the pump group is controlled to decelerate in an inclined wave, and the water pump anti-backflow energy-saving device is controlled to perform a closing action until the pump group stops, and the water pump anti-backflow energy-saving device is in a fully closed state.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the pump valve constant pressure energy-saving switching device described in any one of claims 6-7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the pump valve constant pressure energy-saving switching device described in any one of claims 6-7 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the control method of the pump valve constant pressure energy-saving switching device described in any one of claims 6-7 is implemented.

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