A priming water system for a multi-stage pump and a method of priming water for a multi-stage pump

Abstract

The present application relates to the technical field of irrigation water system, and provides an irrigation water system for a multi-stage pump and an irrigation water method thereof, the irrigation water system comprising a water feeding and distributing device and at least two water feeding pumps, the water feeding and distributing device having a water outlet in communication with a water inlet pipe of the multi-stage pump and at least two water inlets; the water outlet of each water feeding pump is connected with one water inlet of the water feeding and distributing device, and at least one of the water feeding pumps is in communication with the water feeding and distributing device for injecting a water source into the water inlet pipe of the multi-stage pump through the water feeding and distributing device. The present application provides an irrigation water system with redundancy backup capability, extremely high system reliability and the ability to ensure that the multi-stage pump can be reliably started at any time.

Description

Technical Field

[0001] This invention relates to the field of irrigation system technology, and more particularly to an irrigation system and irrigation method for a multi-stage pump. Background Technology

[0002] Multistage pumps, a type of centrifugal pump, are widely used in critical applications requiring high drainage capacity and reliability, such as mine drainage, urban flood control, tunnel engineering, and water conservancy projects, due to their ability to provide high head and large flow rates. However, unlike most positive displacement pumps, multistage centrifugal pumps lack self-priming capability. This means that before starting, the pump body (pump casing) and its inlet pipe (i.e., suction pipe) must be completely filled with the liquid to be pumped (usually water) to expel air and create a vacuum or closed fluid environment. Otherwise, after starting, the impeller will spin dry and fail to generate effective pressure, resulting not only in failure to drain water but also serious damage such as overheating of the pump body and burnt-out seals due to cavitation and dry-running friction. Therefore, equipping multistage pumps with an efficient and reliable pre-start priming system is a necessary prerequisite for ensuring their normal operation.

[0003] Currently, the commonly used multistage pump priming methods in the industry mainly include the following: Vacuum pump priming method: A vacuum pump system is connected to the inlet pipe of a multi-stage pump. The vacuum pump is started to extract air from the pump body and inlet pipe, using atmospheric pressure to force water from the water source into the inlet pipe until it is full. The disadvantages of this method are that the vacuum pump system itself is relatively complex, typically including a vacuum pump, air-water separator, piping, and multiple valves. Maintenance is inconvenient, and the system requires extremely high sealing; any leak in the seal can lead to vacuum failure, thus preventing water priming.

[0004] Jet pump priming method: This method utilizes a high-speed working fluid (usually pressurized water) to create negative pressure through a nozzle, entraining air from the pump body and pipeline to achieve water priming. Although this method has a relatively simple structure, its priming efficiency is low, and it requires an additional high-pressure water source as power, making system configuration inconvenient and limiting its application in some working conditions. Summary of the Invention

[0005] This invention provides a water priming system and method for multi-stage pumps, which solves the above-mentioned technical defects in the prior art and provides a water priming system with redundancy backup capability, extremely high system reliability, and the ability to ensure that multi-stage pumps can be reliably started at any time.

[0006] A first aspect of the present invention provides a priming system for a multi-stage pump, comprising: The water feeding device has an outlet connected to the inlet pipe of a multi-stage pump, and at least two inlets; At least two water pumps, each with its outlet connected to one inlet of the water feeding and water distributing device, and at least one of the water pumps in communication with the water feeding and water distributing device for injecting water into the inlet pipe of the multi-stage pump via the water feeding and water distributing device.

[0007] According to the priming system for a multi-stage pump provided by the present invention, the water supply and water distribution device includes: The water supply unit has a main pipe and at least two branch pipes. The main pipe is provided with the water outlet, and each branch pipe is provided with the water inlet. At least two suction pipes, each of which is detachably connected to the branch pipe and communicates with the corresponding water inlet.

[0008] The priming system for a multi-stage pump provided by the present invention further includes: An anti-backflow component is provided on the flow path of the water outlet to prevent water from flowing back from the multi-stage pump to the water feeding and watering device.

[0009] According to the priming system for a multi-stage pump provided by the present invention, the anti-backflow component includes a one-way valve or a check valve, which is disposed on the flow path of the outlet.

[0010] The priming system for a multi-stage pump provided by the present invention further includes: A protective net is installed at the inlet of each of the aforementioned water pumps (200) to prevent debris from entering the irrigation system.

[0011] According to the priming system for multi-stage pumps provided by the present invention, one of at least two of the feed pumps is designated as the main pump, and the other or the remaining pumps are designated as standby pumps.

[0012] The priming system for a multi-stage pump provided by the present invention further includes: The control unit is electrically connected to the main pump and the standby pump respectively, and monitors the working status of the main pump and the standby pump in real time. When it is determined that the main pump has failed, the standby pump is automatically started to perform the priming operation.

[0013] The priming system for multi-stage pumps provided by this invention integrates at least two feed pumps into a single system by setting up a feed water distribution device as a hub. In conventional priming operations, if the main pump fails, resulting in a lack of water supply, the system will immediately and automatically or manually start another standby feed pump. The standby pump will then take over the work of the main pump, priming the multi-stage pumps through another inlet of the feed water distribution device, ensuring uninterrupted priming operations. This system abandons priming methods such as vacuum pumps and jet pumps, which are complex and inconvenient to maintain, returning to the most reliable priming method. Furthermore, by adding redundancy, it solves the priming problem before starting the multi-stage pumps.

[0014] Because of the presence of a backup feed pump, the system can cope with the sudden failure of a single feed pump, ensuring that the priming operation of the main pump can be completed under any circumstances, thus guaranteeing reliable drainage from the multi-stage pumps. This avoids prolonged shutdowns of the main equipment (multi-stage pumps) due to auxiliary equipment (priming pump) failure, improving the overall utilization rate of the equipment and reducing the potential for significant economic losses or safety risks caused by drainage interruptions. Furthermore, in the event of severe weather such as heavy rain or flash floods, or in emergency situations, the system ensures that the multi-stage pumps can be quickly started, enhancing the ability to respond to disasters and emergencies.

[0015] A second aspect of the present invention provides a priming method for a multi-stage pump, employing a priming system as described in any of the preceding claims, comprising the following steps: Before the multi-stage pump is started, at least one of the two feed pumps is started to fill the inlet pipe of the multi-stage pump with water, and the working status of each feed pump is monitored in real time. If it is determined that the water pump in the start-up state has failed, at least one of the two water pumps will automatically perform the priming operation. The water pump that has been started is stopped once the pump body and inlet pipe of the multi-stage pump are filled with water.

[0016] The priming method for a multi-stage pump provided by the present invention further includes: Set one water pump as the main pump and the other or the rest as standby pumps; When the main pump fails to perform the irrigation operation normally, the system will automatically or manually switch to start the backup pump to continue the irrigation operation.

[0017] According to the priming method for a multi-stage pump provided by the present invention, during the priming process, the water feeding device prevents water from flowing back from the inlet pipe of the multi-stage pump to the unstarted water feeding pump.

[0018] The priming method for multi-stage pumps provided by this invention fully reproduces, from a dynamic operation perspective, the entire process of how the system of this invention exerts its advantages of high reliability and automation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a front view of the priming system for a multi-stage pump provided by the present invention.

[0021] Figure 2 This is a front view of the water supply and water distribution device in the priming system of a multi-stage pump provided by the present invention.

[0022] Figure 3 This is a side view of the priming system for a multi-stage pump provided by the present invention.

[0023] Figure 4 This is a flowchart of the priming method for a multi-stage pump provided by the present invention.

[0024] Figure label: 100. Feeding water distribution device; 110. Feeding water distribution main body; 111. Main pipe; 112. Branch pipe; 113. Water outlet; 114. Water inlet; 120. Suction pipe; 200. Feeding pump; 300. Multistage pump. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0027] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] See Figures 1 to 3 This invention provides a priming system for a multistage pump. This system is a functionally independent module designed to reliably fill the pump body and inlet pipe (also commonly referred to as suction pipe 120) with liquid (usually water) before the multistage pump 300 is started, thereby expelling air and meeting the pump's starting conditions. The priming system for the multistage pump includes a feed water distribution device 100 and at least two feed water pumps 200.

[0030] The water supply and distribution device 100 is the core component of the pipeline collection and distribution system, and can be understood as a specially designed pipeline adapter or integrated manifold. The water supply and distribution device 100 has an outlet 113 connected to the inlet pipe of the multistage pump 300, and at least two inlets 114. The outlet 113 is the only outlet of the system, and its function is to achieve fluid communication with the inlet pipe of the multistage pump 300 being irrigated. In actual installation, it can be connected to a suitable location on the inlet pipe of the multistage pump 300 using standard methods such as flanges, welding, or threads. Each of the two or more inlets 114 serves as an independent access point for an irrigation water source.

[0031] The outlet 113 of each water pump 200 is connected to an inlet 114 of the water feeding and water dispensing device 100. At least one of the water pumps 200 is in communication with the water feeding and water dispensing device 100 to inject water into the inlet pipe of the multistage pump 300 via the water feeding and water dispensing device 100.

[0032] The feed pump 200 is an auxiliary pump used to provide the power and water source required for irrigation, pumping water from the water source (such as a reservoir or sump) to the feed water distribution device 100. The flow rate and head of the feed pump 200 are selected based on the size and installation height of the multistage pump 300. The system contains at least two such feed pumps 200, forming a redundant configuration. In practical applications, it is usually configured as one in use and one on standby, or multiple in use and one on standby.

[0033] Each water pump 200's discharge pipe is connected to an inlet 114 of the water-feeding water-diversion device 100, forming a Y-shaped or claw-shaped structure. Multiple branch lines (from multiple water pumps 200) converge at the water-feeding water-diversion device 100, and then a main line (the outlet 113 of the water-feeding water-diversion device 100) connects to the inlet pipe of the multi-stage pump 300. This creates two or more independent water-filling channels that ultimately converge at one point through the water-feeding water-diversion device 100. The piping between the water pumps 200 and the water-feeding water-diversion device 100 is fixedly installed.

[0034] Based on the above structural description, the priming system for a multi-stage pump provided in this embodiment of the invention aims to solve the problem of priming the multi-stage pump 300 before startup. The specific steps are as follows: Preparation phase: Before the multistage pump 300 needs to be started to drain water, its pump body and inlet pipe are filled with air and it is in an inoperable state. All pipelines of this irrigation system are connected and in place, and at least two feed pumps 200 are in standby status.

[0035] Routine water filling operation: The control system (or operator) issues a water filling command. One of the feed pumps 200 (e.g., designated as the main pump) is started. This main feed pump 200 draws water from the water source and, through its own discharge pipe, forces the water into one inlet 114 of the feed water distribution device 100. The water flows through the feed water distribution device 100, exits from its single outlet 113, and is injected into the inlet pipe of the multistage pump 300, beginning to fill the pipes and pump body, while simultaneously expelling internal air from the vent valve on top of the pump body.

[0036] Water filling complete: Once the pump body and inlet pipe of the multistage pump 300 are completely filled with water (this can be determined by a level sensor, pressure sensor, or preset time), the control system stops the running feed pump 200. At this point, the water filling process is complete, and the multistage pump 300 is ready to start and can be started at any time for normal drainage operations.

[0037] Fault redundancy switching process: If the main pump malfunctions during the above-mentioned routine irrigation operation (e.g., motor damage, wiring problems, impeller jamming, etc.), resulting in the inability to supply water normally, the control system will detect the fault (e.g., by detecting abnormal current, pressure, or flow). At this time, the system will immediately automatically or manually start another standby feed pump 200 (i.e., the backup pump). The backup pump will take over the work of the main pump, irrigating the multistage pump 300 with water through another inlet 114 of the feed water irrigating device 100, ensuring that the irrigation operation can be completed uninterrupted.

[0038] Because in traditional single-pump irrigation systems, if the only pump fails, the entire main drainage system (multi-stage pump 300) becomes paralyzed. This is unacceptable in situations where drainage reliability is extremely important, such as mines, tunnels, and municipal works.

[0039] It is understood that the priming system for multi-stage pumps provided by this invention integrates at least two feed pumps 200 into a single system by setting up a feed water distribution device 100 as a hub. In the aforementioned conventional priming operation, if the main pump fails, resulting in a failure to supply water normally, the system will immediately start another standby feed pump 200 automatically or manually. The standby pump will take over the work of the main pump, priming the multi-stage pump 300 with water through another inlet 114 of the feed water distribution device 100, ensuring that the priming operation can be completed uninterrupted. This system abandons priming methods such as vacuum pumps and jet pumps, which are complex in structure and inconvenient to maintain, and returns to the most reliable priming method. By adding redundancy backup, it solves the priming problem before starting the multi-stage pump 300.

[0040] Because of the presence of a backup feed pump 200, the system can cope with the sudden failure of a single feed pump 200, ensuring that the priming operation of the main pump can be completed under any circumstances, thus guaranteeing the reliable drainage of the multi-stage pump 300. This avoids the situation where the main equipment (multi-stage pump 300) is shut down for a long time due to the failure of auxiliary equipment (priming pump), improving the overall utilization rate of the equipment and reducing the huge economic losses or safety risks that may be caused by drainage interruption. At the same time, in the event of severe weather such as rainstorms or floods, or in emergency situations, the system ensures that the multi-stage pump 300 can be started quickly, enhancing the ability to respond to disasters and emergencies.

[0041] Continue reading Figure 1 and Figure 2 In some embodiments of the present invention, the water feeding and water dispensing device 100 includes a water feeding and water dispensing body 110 and at least two suction pipes 120. The water feeding and water dispensing body 110 has a main pipe 111 and at least two branch pipes 112. The main pipe 111 is provided with an outlet 113, and each branch pipe 112 is provided with an inlet 114. Each suction pipe 120 is detachably connected to a branch pipe 112 and communicates with a corresponding inlet 114.

[0042] The water supply unit 110 is a pipeline assembly comprising a main pipe 111 with a relatively large diameter and at least two branch pipes 112 with relatively smaller diameters branching off from the main pipe 111. The port of the main pipe 111 forms the outlet 113 connecting to the inlet pipe of the multi-stage pump 300, while the port of each branch pipe 112 forms the inlet 114 connecting to the water supply pump 200. The suction pipe 120 is the connecting pipe between the outlet of the water supply pump 200 and the inlet 114 of the water supply unit 110. Connections can be made using flanges, unions, or quick couplings. When a particular water supply pump 200 or its connecting pipeline requires maintenance, it can be quickly disassembled without affecting other parts, improving the maintainability of the system.

[0043] Continue reading Figure 1 and Figure 2 In some embodiments of the present invention, the priming system for the multistage pump further includes an anti-backflow component, which is disposed in the flow path of the outlet 113 to prevent water from flowing back from the multistage pump 300 to the water supply and water distribution device 100. Physically located between the water supply and water distribution device 100 and the inlet pipe of the multistage pump 300, it is the necessary path for priming water to enter the multistage pump 300.

[0044] After irrigation is complete, the inlet pipe of the multistage pump 300 is full of water and has a certain static pressure. Without this component, the water might flow back into the feed pump 200 system under gravity, causing the multistage pump 300 to run out of water again. This ensures that water can only flow into the multistage pump 300 in one direction, thus guaranteeing the irrigation results.

[0045] When the multistage pump 300 is operating normally, there may be high pressure in its inlet pipe (especially when the system is pre-pressurized). The anti-backflow component can effectively prevent high-pressure water from flowing back into the main system, impacting the feed water distribution device 100 and the feed water pump 200 when it is stopped, thus protecting the safety of the auxiliary system.

[0046] During the water filling process, the anti-backflow component can also prevent water from flowing back from the outlet 113 and forming an ineffective circulation through the unstarted standby pump pipeline, ensuring that all water flow is effectively injected into the multi-stage pump 300.

[0047] Furthermore, the anti-backflow component includes a check valve or a one-way valve, which is located in the flow path of the outlet 113. Both check valves and check valves are used to control the unidirectional flow of fluid. A check valve, also known as a non-return valve, has the core function of allowing fluid to flow in only one direction and preventing reverse flow. It typically relies on fluid pressure to open the valve core or valve disc. When the fluid flows in the opposite direction, the valve core or valve disc closes under the action of a spring or its own pressure, thereby preventing backflow. A check valve also has the same unidirectional control function, but its closing mechanism relies more on the weight of the valve disc or spring force, rather than entirely on reverse pressure.

[0048] In some embodiments of the present invention, the priming system for the multi-stage pumps further includes a protective net disposed at the inlet of each feed pump 200 to prevent debris from entering the priming system. That is, the most reasonable location for the protective net is at the inlet of each feed pump 200 for drawing water from a water source (such as a sump).

[0049] Since water sources in wells or pumping stations often contain debris such as mud, sand, stones, and wire, installing protective netting can effectively prevent these debris from entering the system at the source. This protects all downstream equipment, including the impeller of the feed pump 200, the inner cavity of the feed water distribution device 100, the valve core of the anti-backflow component, and the multistage pump 300 itself. By preventing blockages or wear caused by debris, the system failure rate is reduced, the service life of the equipment is extended, and the reliability of the entire irrigation system is further enhanced.

[0050] In some embodiments of the present invention, one of at least two water pumps 200 is designated as the primary pump, and the other or the remaining pumps are designated as standby pumps. The primary pump is the pump that is started by default to perform the water filling task under normal, fault-free conditions. The standby pump is the pump that is in standby mode when the primary pump is working normally, and is only activated when the primary pump fails or needs to be rotated for maintenance.

[0051] The physical configuration of at least two pumps has been upgraded to a one-in-one-out-of-service operation strategy, laying the logical foundation for automated control and standardized operating procedures. This makes equipment management and maintenance more convenient. For example, the operation of the primary and backup pumps can be switched periodically to ensure that both pumps are in good condition and to prevent the backup pump from rusting and seizing up due to prolonged disuse.

[0052] In some embodiments of the present invention, the irrigation system for multi-stage pumps further includes a control unit, which is electrically connected to the main pump and the standby pump respectively, and monitors the working status of the main pump and the standby pump in real time. When it is determined that the main pump has failed, the standby pump is automatically started to perform irrigation operation.

[0053] The control unit can be a PLC (Programmable Logic Controller), a microcontroller system, or a logic circuit composed of relays and contactors. The output of the control unit is connected to the motor control circuit (such as a contactor coil) of the main pump and the standby pump to control the start and stop of the main pump and the standby pump. The input of the control unit receives signals from monitoring the operating status of the main pump. This monitoring can be achieved by detecting the motor operating current (e.g., through a current transformer), detecting the outlet pipeline pressure (e.g., through a pressure sensor), or detecting the flow rate (e.g., through a flow switch).

[0054] The control unit has pre-set judgment logic. For example, when the command to start the main pump is issued, if no normal operating current or outlet pressure is detected within a preset time, the control unit determines that the main pump has failed and immediately issues a command to disconnect the main pump circuit and simultaneously connect the standby pump circuit to start the standby pump. Fault switching is completed instantly, without the need for manual detection or operation, thus shortening the fault response time.

[0055] See Figure 4 The present invention also provides a priming method for a multi-stage pump, employing the priming system of any of the above embodiments, comprising the following steps: Step S100: Before starting the multistage pump 300, start at least one of the two feed pumps 200 to fill the inlet pipe of the multistage pump 300 with water, and monitor the working status of each feed pump 200 in real time.

[0056] Understandably, this step involves starting one of the system's feed pumps 200 to begin water filling before the main pump (multistage pump 300) needs to be started. The water filling process is not a blind operation, but is accompanied by real-time status monitoring.

[0057] Step S200: When it is determined that the water pump 200 in the start-up state has failed, automatically activate at least one of the two water pumps 200 to perform the water priming operation.

[0058] Understandably, if the monitoring system detects a malfunction in the currently operating water pump 200 during the irrigation process (such as abnormal current or insufficient pressure), it will automatically switch to another standby pump, which will then take over to complete the remaining irrigation task.

[0059] Step S300: Stop the started water pump 200 after the pump body and inlet pipe of the multistage pump 300 are filled with water.

[0060] Understandably, once the inlet pipe and pump body of the multistage pump 300 are completely filled (e.g., water is continuously flowing out from the top vent valve), the final step is to stop the running feed pump 200.

[0061] In other words, in addition to protecting the system equipment itself, the embodiments of the present invention also protect the core operation method for achieving highly reliable irrigation and water diversion. From the perspective of dynamic operation, it fully reproduces the entire process of how the system of the present invention exerts its advantages of high reliability and automation.

[0062] Furthermore, priming methods for multistage pumps also include: Set one water pump 200 as the main pump and the other or the rest as standby pumps; When the main pump fails to perform the irrigation operation normally, the system will automatically or manually switch to start the standby pump to continue the irrigation operation.

[0063] Understandably, before implementing the irrigation method, a logical setup is necessary to determine which pump is the primary pump and which is the backup pump. When the primary pump fails, switching to the backup pump can be automatic or manual. Automatic switching is performed by the control unit. Manual switching, in cases of simplified configuration or automatic system failure, is performed by the operator using buttons or switches.

[0064] Furthermore, during the irrigation process, the water feeding device 100 prevents water from flowing back from the inlet pipe of the multistage pump 300 into the unstarted water feeding pump 200.

[0065] Understandably, this step describes an important phenomenon and control process that occurs during the dynamic process of irrigation. When a feed pump 200 (such as the main pump) is running, the water pressure it generates fills the entire feed water distribution device 100. At this time, it is essential to effectively prevent this pressurized water from flowing back through the other inlet 114 of the feed water distribution device 100 (connected to the non-started standby pump). Failure to effectively prevent this internal backflow will result in energy loss, reduced irrigation efficiency, and may even reverse-drive the standby pump impeller, causing damage.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A priming system for a multi-stage pump, characterized in that, include: The water feeding device has an outlet connected to the inlet pipe of a multi-stage pump, and at least two inlets; At least two water pumps, each with its outlet connected to one inlet of the water feeding and water distributing device, and at least one of the water pumps in communication with the water feeding and water distributing device for injecting water into the inlet pipe of the multi-stage pump via the water feeding and water distributing device.

2. The priming system for a multi-stage pump according to claim 1, characterized in that, The water feeding and watering device includes: The water supply unit has a main pipe and at least two branch pipes. The main pipe is provided with the water outlet, and each branch pipe is provided with the water inlet. At least two suction pipes, each of which is detachably connected to the branch pipe and communicates with the corresponding water inlet.

3. The priming system for a multi-stage pump according to claim 2, characterized in that, Also includes: An anti-backflow component is provided on the flow path of the water outlet to prevent water from flowing back from the multi-stage pump to the water feeding and watering device.

4. The priming system for a multi-stage pump according to claim 3, characterized in that, The anti-backflow component includes a one-way valve or a check valve, which is located on the flow path of the outlet.

5. The priming system for a multi-stage pump according to claim 2, characterized in that, Also includes: A protective net is installed at the inlet of each of the aforementioned water pumps to prevent debris from entering the irrigation system.

6. The priming system for a multi-stage pump according to any one of claims 1 to 5, characterized in that, At least one of the two water pumps is designated as the primary pump, and the other or the remaining pumps are designated as standby pumps.

7. The priming system for a multi-stage pump according to claim 6, characterized in that, Also includes: The control unit is electrically connected to the main pump and the standby pump respectively, and monitors the working status of the main pump and the standby pump in real time. When it is determined that the main pump has failed, the standby pump is automatically started to perform the priming operation.

8. A priming method for a multi-stage pump, employing the priming system as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Before the multi-stage pump is started, at least one of the two feed pumps is started to fill the inlet pipe of the multi-stage pump with water, and the working status of each feed pump is monitored in real time. If it is determined that the water pump in the start-up state has failed, at least one of the two water pumps will automatically perform the priming operation; The water supply pump that has been started will be stopped once the pump body and inlet pipe of the multi-stage pump are filled with water.

9. The priming method for a multi-stage pump according to claim 8, characterized in that, The method further includes: Set one water pump as the main pump and the other or the rest as standby pumps; When the main pump fails to perform the irrigation operation normally, the system will automatically or manually switch to start the backup pump to continue the irrigation operation.

10. The priming method for a multi-stage pump according to claim 9, characterized in that, During the water filling process, the water feeding device prevents water from flowing back from the inlet pipe of the multi-stage pump into the unstarted water feeding pump.

Images