Water pumping station system

Abstract

The utility model relates to high pressure fluid power technical field more specifically provides the water pump station system of high pressure water power executor rig can more adaptably provide water power, it includes: the water inlet pipeline of water supply inflow and the water outlet pipeline of water supply discharge, still include first pressure module, it has: first variable frequency motor, first water pump, it is connected between water inlet pipeline and water outlet pipeline, and is configured as: the water that flows into water inlet pipeline is output to water outlet pipeline after pressurizing, wherein, the output shaft of first variable frequency motor is connected on the input shaft of first water pump, to through change the rotating speed of this output shaft, the output flow of first water pump is regulated, and water inlet pipeline and water outlet pipeline are connected with at least one energy accumulator respectively, and the energy accumulator is configured as: to absorb the pressure pulse of water flow in the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure fluid power technology, and more specifically to a system for providing hydrodynamic power to high-pressure hydrodynamic actuators (such as the impact hammer of a multi-functional drilling rig). Background Technology

[0002] In drilling operations in fields such as tunnel excavation, mining, and geological exploration, challenges such as high rock hardness, long drilling depth, and difficulty in removing rock debris are frequently encountered. High-pressure water-powered actuators (such as the impact hammer of a multi-functional drilling rig) are effective equipment for addressing these challenges. They rely on high-pressure water to drive an internal impact mechanism for efficient rock crushing. During construction, a high-pressure water pump station is used to provide the necessary high-pressure water to the high-pressure water-powered actuator to drive it in drilling operations.

[0003] However, most of the existing high-pressure water pump stations are not specifically designed for drilling operations. Directly transplanting them to high-pressure water power actuator drilling rigs often results in poor adaptability due to the complexity of drilling operations. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a water pump station system that can more effectively provide water power to high-pressure water-powered actuator drilling rigs.

[0005] The overall technical solution of this utility model is as follows:

[0006] This utility model is based on the problem of how to form a water pump station system that is more suitable for high-pressure hydrodynamic actuators, specifically:

[0007] Traditional pumping stations typically use fixed-frequency (fixed-speed) motors to drive water pumps, maintaining a constant output flow. However, in drilling operations, the flow demand of high-pressure hydraulic actuators varies dynamically. For example, the required flow is lower when the actuator is new, but increases as the seals wear down, or adjustments to the impact energy are needed when operating in rock formations of varying hardness, thus requiring flow regulation. This makes existing pumping station systems unable to meet the power supply needs of high-pressure hydraulic actuators.

[0008] Furthermore, due to the dynamic flow rate requirements of high-pressure hydraulic actuators, pressure pulses are prone to occur in the pipeline. That is, when a high-pressure hydraulic actuator suddenly turns on or off, the flow velocity of the liquid (such as water) inside changes drastically, and the liquid's kinetic energy is instantly converted into pressure energy, thus triggering a violent pressure shock wave within the pipeline. This pressure shock wave is the pressure pulse. The presence of this pressure pulse makes existing pumping stations unsuitable for long-term use with high-pressure hydraulic actuators, easily leading to malfunctions.

[0009] Based on this, the present invention provides a water pump station system that can more effectively provide water power to high-pressure water-powered actuator drilling rigs.

[0010] Specifically, the water pumping station system includes: an inlet pipe for water supply and an outlet pipe for water supply.

[0011] It also includes a first pressurization module, which has:

[0012] First variable frequency motor;

[0013] The first water pump is connected between the inlet pipe and the outlet pipe and is configured to pressurize the water flowing into the inlet pipe and output it to the outlet pipe.

[0014] The output shaft of the first variable frequency motor is connected to the input shaft of the first water pump so as to regulate the output flow rate of the first water pump by changing the rotation speed of the output shaft.

[0015] Furthermore, the inlet and outlet water pipes are each connected to at least one accumulator, which is configured to absorb pressure pulses from the water flow in the pipes.

[0016] In the above scheme, the first variable frequency motor drives the first water pump to work, thereby pressurizing the water in the inlet pipe and delivering it to the outlet pipe for output (to the high-pressure water power actuator); the output flow of the water pump station system can be controlled according to external needs (power needs of the high-pressure water power actuator), such as manually controlling the speed of the output shaft of the first variable frequency motor, so as to meet the flow requirements of the high-pressure water power actuator under different operating conditions.

[0017] Moreover, by installing an accumulator, pressure pulses in the pipeline can be absorbed, which not only improves the stability and reliability of the pumping station system during operation, but also reduces damage to the pipeline and extends its overall service life.

[0018] In some implementations, the outlet pipe is equipped with an outlet pressure sensor configured to monitor the water pressure in the outlet pipe.

[0019] By setting up an outlet water pressure sensor, the water pressure value of the outlet pipeline can be monitored in real time, so as to quickly and directly determine whether it meets the water pressure input requirements of the high-pressure hydraulic actuator, which facilitates subsequent adjustment and fault diagnosis.

[0020] In some implementations, the inlet pipe is equipped with an inlet pressure sensor configured to monitor the water pressure in the inlet pipe. This allows for a better understanding of the inlet pressure value, providing a reference for controlling the pressurization parameters of the first pressurization module. This facilitates more accurate subsequent adjustment of the corresponding speed of the first variable frequency motor, thereby providing more precise hydraulic power to the high-pressure hydraulic actuator to meet its pressure requirements.

[0021] Furthermore, in some implementations, the pumping station system also includes a control module;

[0022] The first variable frequency motor and the inlet water pressure sensor are both electrically connected to the control module, which is configured to receive the water pressure value monitored by the inlet water pressure sensor, compare the water pressure value with the set lower limit of water pressure, and control the first variable frequency motor to stop when the monitored water pressure value is less than the lower limit of water pressure.

[0023] This setting automatically shuts down the first variable frequency motor when the water inflow is too low, protecting the pump structure and minimizing the risk of damage such as cavitation or even water cavitation.

[0024] In some embodiments, the outlet pipe and the inlet pipe are also connected by a first pressure relief pipe, which is equipped with a first unloading valve and is configured as follows:

[0025] When the water pressure in the outlet pipe is greater than the first pressure threshold, water in the outlet pipe is allowed to flow into the inlet pipe through the first pressure relief pipe;

[0026] When the water pressure in the outlet pipe is not greater than the first pressure threshold, the first pressure relief pipe is controlled to be in a blocked state.

[0027] By setting up a first pressure relief pipeline controlled by a first unloading valve, the unloading valve automatically opens to relieve pressure when the pressure in the outlet pipeline exceeds the first pressure threshold (safety upper limit), guiding the high-pressure water back to the inlet pipeline, thereby effectively preventing system overpressure and providing protection for the system.

[0028] In some implementations, the water inlet pipe has a water inlet and a control valve is provided in the water inlet pipe;

[0029] The control valve is configured to be located between the first water pump and the inlet, and to control the opening / closing of the flow path between the first water pump and the inlet.

[0030] A control valve is installed between the water inlet and the first water pump, which can easily cut off the water supply, facilitate the isolation and maintenance of the water pump, and improve the maintainability and ease of operation of the system.

[0031] In some embodiments, a filter is provided in the inlet pipe, which is configured to filter the water entering the first water pump.

[0032] By adding a filter, the water entering the pump can be filtered to remove impurities, effectively protecting the pump, reducing wear, and extending its service life.

[0033] Furthermore, in some embodiments, a filter is disposed between the control valve and the first water pump in the water inlet pipeline flow path.

[0034] By clearly placing the filter between the control valve and the water pump, the filter and the water pump can be isolated as a whole after the control valve is closed, preventing external impurities from causing unnecessary contamination or blockage to the filter.

[0035] In some implementations, the inlet pipe is connected to an inlet branch, and the outlet pipe is connected to an outlet branch.

[0036] The pumping station system also includes a second pressurization module, which has:

[0037] Second variable frequency motor;

[0038] The second water pump is connected between the inlet branch and the outlet branch and is configured to pressurize the water flowing into the inlet branch and output it to the outlet branch.

[0039] The output shaft of the second variable frequency motor is connected to the input shaft of the second water pump so as to regulate the output flow rate of the second water pump by changing the rotation speed of the output shaft.

[0040] By adding a second pressurization module (containing a second variable frequency motor and a second water pump) in parallel, a dual-pump system is formed. This not only increases the total output flow and power of the system, but also expands the flow regulation range, enabling the pumping station system to be compatible with more types of high-pressure hydraulic actuators.

[0041] Furthermore, in some embodiments, the outlet branch and the inlet pipe are connected by a second pressure relief pipe, which is equipped with a second unloading valve and is configured as follows:

[0042] When the water pressure in the outlet branch is greater than the second pressure threshold, water in the outlet branch is allowed to flow into the inlet branch through the second pressure relief pipe.

[0043] When the water pressure in the outlet branch is not greater than the second pressure threshold, the second pressure relief pipeline is controlled to be in a blocked state.

[0044] By setting a second pressure relief pipeline and a second unloading valve for the water outlet branch corresponding to the second pressurization module, independent and targeted overpressure protection is provided for each pressurization module connected in parallel, thereby improving the overall system's safety.

[0045] The main beneficial effects of the above technical solution are as follows:

[0046] In the aforementioned pumping station system, by installing a first water pump driven by a first variable frequency motor, the output flow rate can be changed manually by altering the rotational speed of the motor's output shaft. This allows the pumping station system to better meet the flow requirements of the high-pressure hydrodynamic actuator during operation. Furthermore, by installing accumulators on both the inlet and outlet pipes, pressure pulses caused by sudden flow changes or actuator start-up and shutdown are effectively absorbed and reduced, improving the stability and reliability of the pumping station system and enabling it to better provide hydrodynamic power to the high-pressure hydrodynamic actuator. Attached Figure Description

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] Figure 1 This is a schematic diagram of the first possible composition of a water pumping station system.

[0049] Figure 2 This is a schematic diagram of the second component of a water pumping station system.

[0050] Figure 3 This is a schematic diagram of the third component of a water pumping station system. Detailed Implementation

[0051] The present invention will be illustrated in detail below with reference to the embodiments.

[0052] Example:

[0053] A water pumping station system is used to receive water, pressurize it, and deliver it to high-pressure hydraulic actuators (such as the impact hammer of a multi-functional drilling rig), providing the hydraulic power required for the high-pressure hydraulic actuators to operate.

[0054] like Figure 1 As shown, the water pump station system in this embodiment includes: an inlet pipe 1 for water supply, an outlet pipe 2 for water supply, and a first pressurization module 3.

[0055] The first pressurization module 3 includes a first variable frequency motor 3.1 and a first water pump 3.2. The first water pump 3.2 is connected between the inlet pipe 1 and the outlet pipe 2 and is configured to pressurize the water flowing into the inlet pipe 1 and output it to the outlet pipe 2.

[0056] Specifically, the first water pump 3.2 includes a pump body with a pump chamber for water flow inside. The pump chamber contains a movable component, such as an impeller, for pressurizing and pushing the water. This movable component is driven by the rotation of the input shaft of the first water pump 3.2. The pump chamber has an inlet for water inflow and an outlet for water outflow.

[0057] One end of the inlet pipe 1 has an inlet, and the other end is connected to the inlet of the pump chamber; one end of the outlet pipe 2 has an outlet, and the other end is connected to the outlet of the pump chamber; so that the first water pump 3.2 is connected between the inlet pipe 1 and the outlet pipe 2.

[0058] Furthermore, the output shaft of the first variable frequency motor 3.1 is connected to the input shaft of the first water pump 3.2 via, for example, a coupling. By turning on the power, the first variable frequency motor 3.1 is turned on, causing its output shaft to rotate, which in turn drives the input shaft of the first water pump 3.2 to rotate. At this time, water flows from the inlet of the inlet pipe 1 into the pump chamber of the first water pump 3.2. Through the pressurizing action of the first water pump 3.2, the water in the pump chamber of the first water pump 3.2 is pressurized and output to the outlet pipe 2, and then transported to the high-pressure hydraulic actuator from the outlet of the outlet pipe 2.

[0059] Furthermore, the output flow rate of the first water pump 3.2 can be controlled by adjusting and changing the speed of the output shaft of the first variable frequency motor 3.1.

[0060] The inlet pipe 1 and the outlet pipe 2 are each connected to at least one accumulator, such as Figure 1 As shown, the two accumulators are designated as the first accumulator 4.1 and the second accumulator 4.2, respectively; the inlet pipe 1 is connected to the first accumulator 4.1, and the outlet pipe 2 is connected to the second accumulator 4.2.

[0061] Both the first accumulator 4.1 and the second accumulator 4.2 are configured to absorb pressure pulses from the water flow in the pipeline (i.e., when the high-pressure hydraulic actuator suddenly opens or closes, the flow velocity of the internal liquid (such as water) suddenly changes drastically, and the kinetic energy of the liquid is instantly converted into pressure energy, thereby triggering a violent pressure shock wave in the pipeline, which is called a pressure pulse).

[0062] Specifically, an accumulator is a component commonly used in pipeline systems to absorb pressure pulses, such as the accumulator with publication number CN108286537B. In this embodiment, the accumulator may include a container shell, the interior of which is hollow and divided into a fluid chamber and a gas chamber by a movable isolation element (such as a diaphragm or piston). The fluid chamber is connected to the pipeline, and the gas chamber is filled with inert gas at a predetermined pressure.

[0063] When a pressure pulse is generated in the pipeline, the pressure in the fluid chamber increases, causing the movable isolating element to deform or move towards the gas chamber, thereby absorbing the pressure pulse of the water flow in the pipeline. After the water pressure returns to normal, the movable isolating element resets.

[0064] The first accumulator 4.1 has its fluid chamber connected to the inlet pipe 1 via a pipe, and the first accumulator 4.1 is used to absorb the pressure pulse of the water flow in the inlet pipe 1; the second accumulator 4.2 has its fluid chamber connected to the outlet pipe 2 via a pipe, and the second accumulator 4.2 is used to absorb the pressure pulse of the water flow in the outlet pipe 2.

[0065] like Figure 1 As shown, the outlet pipe 2 is also equipped with an outlet pressure sensor 5, which is configured to monitor the water pressure in the outlet pipe 2. By electrically connecting the outlet pressure sensor 5 to a display device, the display device receives and displays the water pressure value monitored by the outlet pressure sensor 5, thus revealing the outlet pressure value of the pumping station system.

[0066] like Figure 1 As shown, the water inlet pipe 1 is also equipped with a water inlet pressure sensor 6, which is configured to monitor the water pressure value in the water inlet pipe 1.

[0067] Furthermore, the pumping station system also has a control module (such as a PLC main board assembly for controlling the start and stop of the pumping station system); the first variable frequency motor 3.1 and the inlet water pressure sensor 6 are both electrically connected to the control module, and the control module is configured to: receive the water pressure value monitored by the inlet water pressure sensor 6, compare the water pressure value with the set lower limit of water pressure, and control the first variable frequency motor 3.1 to stop when the monitored water pressure value is less than the lower limit of water pressure.

[0068] The lower limit of water pressure is a value set based on the water pressure value monitored when the first water pump 3.2 is idling.

[0069] like Figure 1 As shown, the outlet pipe 2 and the inlet pipe 1 are also connected by a first pressure relief pipe 7. One end of the first pressure relief pipe 7 is connected to the inlet pipe 1, and the other end is connected to the outlet pipe 2.

[0070] Furthermore, the first pressure relief pipeline 7 is equipped with a first unloading valve 8, such as an overflow unloading valve. The first unloading valve 8 can be composed of an overflow valve and a check valve. When the water pressure reaches the opening pressure of the overflow valve, the overflow valve opens and the pump is unloaded. When the water pressure drops to the closing pressure of the overflow valve, the overflow valve closes. In addition, the check valve only allows water in the outlet pipeline 2 to flow unidirectionally to the inlet pipeline 1 through the first pressure relief pipeline 7.

[0071] By setting a first pressure threshold (based on the actual maximum pressure requirement) in the first unloading valve 8, the first unloading valve 8 is configured such that: when the water pressure in the outlet pipe 2 is greater than the first pressure threshold, water in the outlet pipe 2 is allowed to flow into the inlet pipe 1 through the first pressure relief pipe 7; when the water pressure in the outlet pipe 2 is not greater than the first pressure threshold, the first pressure relief pipe 7 is controlled to be in a blocked state, preventing water from flowing through the first pressure relief pipe 7 in the outlet pipe 2 and the inlet pipe 1.

[0072] like Figure 1 As shown, the water inlet pipe 1 has a water inlet, and a control valve 9 is provided in the water inlet pipe 1. It can be a shut-off valve commonly used to control the flow of the pipe. In this embodiment, the control valve 9 is located between the first water pump 3.2 and the water inlet, and controls the flow of the flow path between the first water pump 3.2 and the water inlet.

[0073] like Figure 1 As shown, a filter 10 is installed in the water inlet pipe 1. The filter is made of a filtration structure such as a sponge or a filter screen and is placed in the flow path of the water inlet pipe 1 to filter the water entering the first water pump 3.2.

[0074] In this embodiment, as Figure 1 As shown, in the flow path of the water inlet pipe 1, the filter 10 is installed between the control valve 9 and the first water pump 3.2.

[0075] Furthermore, based on the above scheme, such as Figure 2 As shown, the water inlet pipe 1 can also be connected to the water inlet branch 1.1, and the water outlet pipe 2 can be connected to the water outlet branch 2.1.

[0076] Referring to the structure and configuration of the first water pump 3.2 described above, the second water pump 11.2 includes a pump body with a pump chamber for water flow inside. The pump chamber contains a movable component, such as an impeller, for pressurizing and pushing the water. This movable component is driven by the rotation of the input shaft of the second water pump 11.2. The pump chamber has an inlet for water inflow and an outlet for water outflow.

[0077] One end of the inlet branch 1.1 is connected to the inlet pipe 1, and the other end is connected to the inlet of the pump chamber of the second water pump 11.2; one end of the outlet branch 2.1 is connected to the outlet pipe 2, and the other end is connected to the outlet of the pump chamber of the second water pump 11.2; so that the second water pump 11.2 is connected between the inlet branch 1.1 and the outlet branch 2.1, and the second water pump 11.2 pressurizes the water flowing into the inlet branch 1.1 and outputs it to the outlet branch 2.1.

[0078] The input shaft of the second water pump 11.2 is connected to the output shaft of the second variable frequency motor 11.1 via, for example, a coupling. By changing the rotational speed of this output shaft, the output flow rate of the second water pump 11.2 can be adjusted.

[0079] The second variable frequency motor 11.1 and the second water pump 11.2 together constitute the second pressurization module 11.

[0080] like Figure 2 As shown, the outlet branch 2.1 and the inlet pipe 1 are also connected by a second pressure relief pipe 12. One end of the second pressure relief pipe 12 is connected to the inlet pipe 1, and the other end is connected to the outlet branch 2.1.

[0081] Furthermore, the second pressure relief pipeline 12 is equipped with a second unloading valve 13, such as an overflow unloading valve. The second unloading valve 13 can be composed of an overflow valve and a check valve. When the water pressure reaches the opening pressure of the overflow valve, the overflow valve opens and the pump is unloaded. When the water pressure drops to the closing pressure of the overflow valve, the overflow valve closes. Moreover, the check valve only allows water in the outlet branch 2.1 to flow unidirectionally to the inlet pipeline 1 through the second pressure relief pipeline 12.

[0082] By setting a second pressure threshold (based on the actual maximum pressure requirement) in the second unloading valve 13, the second unloading valve 13 is configured such that: when the water pressure in the outlet branch 2.1 is greater than the second pressure threshold, water in the outlet branch 2.1 is allowed to flow into the inlet pipe 1 through the second pressure relief pipe 12; when the water pressure in the outlet branch 2.1 is not greater than the second pressure threshold, the second pressure relief pipe 12 is controlled to be in a blocked state, preventing water from flowing through the second pressure relief pipe 12 in the outlet branch 2.1 and the inlet pipe 1.

[0083] When a first pressurization module 3 and a second pressurization module 11 are provided, they can work independently or simultaneously. Furthermore, the first variable frequency motor 3.1 of the first pressurization module 3 and the second variable frequency motor 11.1 of the second pressurization module 11 can be electrically connected to a control module, which controls the opening and closing of the first pressurization module 3 and the second pressurization module 11.

[0084] Furthermore, such as Figure 3As shown, a third variable frequency motor 14 with dual output shafts can be installed in the pumping station system. One output shaft of the third variable frequency motor 14 is connected to the input shaft of the first pump 3.2 via a coupling, for example, and the other output shaft is connected to the input shaft of the second pump 11.2 via a coupling, for example, to synchronously drive the first pump 3.2 and the second pump 11.2. In this case, the portion of the third variable frequency motor 14 with one output shaft is equivalent to the first variable frequency motor 3.1, and the portion of the third variable frequency motor 14 with the other output shaft is equivalent to the second variable frequency motor 11.1.

[0085] When the water pumping station system in this embodiment is used:

[0086] Connect the outlet of water pipe 2 to the water inlet of the high-pressure water power actuator, and connect the inlet of water pipe 1 to the water supply source (e.g., connect it to a faucet).

[0087] Open control valve 9 to supply water into inlet pipe 1, connect the power supply to the variable frequency motor and start it, thereby driving the water pump to run. Driven by the running power of the water pump, water flows into inlet pipe 1, flows through filter 10, and then flows into the water pump. After being pressurized by the water pump, it flows into outlet pipe 2 and flows out to the high-pressure water power actuator to provide water power to drive the high-pressure water power actuator to perform drilling action.

[0088] In this process, the speed of the variable frequency motor output shaft is adjusted according to the injection flow requirements of the high-pressure hydraulic actuator, thereby controlling the water flow rate output by the pump. The variable frequency motor and the specific method for adjusting its output shaft speed are common knowledge in this field and will not be elaborated upon here.

[0089] When the water pumping station system is not in use:

[0090] Turning off the variable frequency motor will stop the water pump and close the control valve 9 to prevent water from flowing into the inlet pipe 1, thus stopping the water supply to the pump station system.

[0091] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present utility model, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" in the description should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model according to the specific circumstances.

[0092] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. Water pumping station system, including: The inlet pipe into which water flows in, and the outlet pipe into which water flows out; Its characteristic is that it further includes a first pressurization module, which has: First variable frequency motor; A first water pump is connected between the inlet pipe and the outlet pipe and is configured to pressurize the water flowing into the inlet pipe and output it to the outlet pipe. The output shaft of the first variable frequency motor is connected to the input shaft of the first water pump so as to regulate the output flow rate of the first water pump by changing the rotation speed of the output shaft. Furthermore, the inlet pipe and the outlet pipe are each connected to at least one accumulator, which is configured to absorb pressure pulses of the water flow in the pipe.

2. The water pumping station system according to claim 1, characterized in that: The water outlet pipeline is equipped with a water pressure sensor, which is configured to monitor the water pressure value in the water outlet pipeline.

3. The water pumping station system according to claim 1, characterized in that: The water inlet pipeline is equipped with a water inlet pressure sensor, which is configured to monitor the water pressure value in the water inlet pipeline.

4. The water pumping station system according to claim 3, characterized in that: The pumping station system also has a control module; The first variable frequency motor and the inlet water pressure sensor are both electrically connected to the control module, and the control module is configured to: receive the water pressure value monitored by the inlet water pressure sensor, compare the water pressure value with the set lower limit of water pressure, and control the first variable frequency motor to stop when the monitored water pressure value is less than the lower limit of water pressure.

5. The water pumping station system according to claim 1, characterized in that: The outlet pipe and the inlet pipe are also connected by a first pressure relief pipe, which is equipped with a first unloading valve and is configured as follows: When the water pressure in the outlet pipe is greater than the first pressure threshold, water in the outlet pipe is allowed to flow into the inlet pipe through the first pressure relief pipe; When the water pressure in the outlet pipeline is not greater than the first pressure threshold, the first pressure relief pipeline is controlled to be in a blocked state.

6. The water pumping station system according to claim 1, characterized in that: The water inlet pipe has a water inlet and a control valve is installed in the water inlet pipe; The control valve is configured to be located between the first water pump and the inlet, and to control the opening / closing of the flow path between the first water pump and the inlet.

7. The water pumping station system according to claim 6, characterized in that: The water inlet pipe is equipped with a filter, which is configured to filter the water entering the first water pump.

8. The water pumping station system according to claim 7, characterized in that: The filter is located between the control valve and the first water pump in the flow path of the water inlet pipeline.

9. The water pumping station system according to any one of claims 1 to 8, characterized in that: The inlet pipe is connected to an inlet branch, and the outlet pipe is connected to an outlet branch; The pumping station system also includes a second pressurization module, which has: Second variable frequency motor; The second water pump is connected between the inlet branch and the outlet branch and is configured to pressurize the water flowing into the inlet branch and output it to the outlet branch. The output shaft of the second variable frequency motor is connected to the input shaft of the second water pump so as to regulate the output flow rate of the second water pump by changing the rotational speed of the output shaft.

10. The pumping station system according to claim 9, characterized in that: The outlet branch and the inlet pipe are also connected by a second pressure relief pipe, which is equipped with a second unloading valve and is configured as follows: When the water pressure in the outlet branch is greater than the second pressure threshold, water in the outlet branch is allowed to flow into the inlet pipe through the second pressure relief pipe; When the water pressure in the outlet branch is not greater than the second pressure threshold, the second pressure relief pipeline is controlled to be in a blocked state.

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