Pressure stabilizing tank

Abstract

The invention relates to the technical field of water supply equipment, and discloses a surge tank which comprises a surge tank body and a control box configured for the surge tank body, an air bag tank is arranged in the surge tank body, the control box is provided with a PLC control system, and the control box and the PLC control system are connected with an upper computer; the upper computer interface can send an automatic control instruction to the PLC control system. The surge tank and the air bag tank are each provided with a pressure sensor used for monitoring the pressure of the surge tank and the air bag tank and the data information of the valve state. The control box is provided with a remote / local mode and used for receiving control information of the upper computer and controlling the valves of the pressure stabilizing tank and the air bag tank to be opened and closed. The surge tank and the air bag tank can adapt to dynamic load changes and automatic pressure supplementing operation, the filter is made of large-size stainless steel, a differential pressure gauge is arranged on the filter, water flow disturbance can be reduced, and the cleanliness of the surge tank is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of water supply equipment, in particular to a pressure stabilizing tank. Background Art

[0002] A surge tank, also known as a pressure stabilization tank or pressure buffer tank, is a device used to stabilize system pressure. It is widely used in various industrial processes, especially where pressure needs to be stabilized to ensure stable operation of the process.

[0003] The main function is to stabilize the system pressure, reduce pressure fluctuations, ensure that the process is carried out under stable pressure conditions, absorb or release pressure when the pressure suddenly rises or drops, play a buffering role, and protect the system equipment from pressure shocks. At the same time, it can also store a certain amount of pressure energy and release it when the system needs it to meet the system's instantaneous pressure requirements.

[0004] However, existing pressure-stabilizing tanks consume additional energy to maintain system pressure stability to ensure their normal operation and safety, mainly including manual inflation of the rubber diaphragm through the inflation port; regular maintenance and inspection of components such as the tank body, valves, and filters, as well as necessary cleaning and replacement are also required; the capacity is limited, and when the system pressure fluctuates greatly or lasts for a long time, the pressure-stabilizing tank may not be able to fully absorb or release enough pressure, resulting in unstable system pressure.

[0005] In view of this, it is necessary to provide a pressure stabilizing tank to solve the problems existing in the prior art, such as the need to manually inflate the rubber diaphragm through the inflation port regularly, maintain the filter, and have limited capacity. Summary of the Invention

[0006] In view of this, the present invention proposes a pressure stabilizing tank, which aims to solve the problems existing in the prior art, such as limited capacity, regular inflation of the rubber diaphragm through the inflation port and maintenance of the filter, which makes it difficult to meet the requirements of high-precision water flow stability.

[0007] The present invention proposes a pressure-stabilizing tank, comprising a pressure-stabilizing tank and a control box configured with the pressure-stabilizing tank, an airbag tank being arranged in the pressure-stabilizing tank, and a PLC control system being arranged in the control box. The control box and the PLC control system are connected to a host computer; the set maximum pressure value in the pressure-stabilizing tank, the minimum pressure value in the pressure-stabilizing tank, the maximum pressure value in the airbag tank, and the minimum pressure value in the airbag tank can be input into the host computer interface, and automatic control instructions are issued to the PLC control system; the pressure-stabilizing tank and the airbag tank are also provided with pressure sensors for monitoring data information on the pressure and valve status of the pressure-stabilizing tank and the airbag tank; the control box is provided with a remote / local mode for receiving control information from the host computer and controlling the opening and closing of the valves of the pressure-stabilizing tank and the airbag tank.

[0008] Furthermore, the upper computer control information is implemented based on a voltage stabilizing and regulating component, which includes: a variable frequency pump, a frequency converter and a first pressure sensor, wherein the variable frequency pump is used to absorb water from a water source and transport the water to a downstream system; the frequency converter is directly connected to the variable frequency pump motor to adjust its speed; the first pressure sensor is arranged at the outlet of the pressure stabilizing tank to transmit the pressure signal to the PLC control system; the control box is connected to the valves and control signal cables of the pressure stabilizing tank and the airbag tank.

[0009] Furthermore, the pressure stabilizing and regulating component also includes an air pump and a second pressure sensor arranged on the air cavity side of the air bag tank, and the second pressure sensor is used to monitor the gas pressure in real time; when the second pressure sensor detects that the pressure of the air bag tank is less than the threshold, the PLC control system triggers the air pump to start; if the continuous pressure replenishment time exceeds the set time and the pressure of the air bag tank still does not reach the threshold, the PLC control system triggers an alarm signal and performs shutdown protection.

[0010] Furthermore, a large-volume filter is provided on the pipeline between the variable frequency pump outlet and the pressure stabilizing tank inlet, the filter inlet end is threadedly connected to the variable frequency pump outlet pipeline, and the filter outlet end is connected to the pressure stabilizing tank inlet.

[0011] Furthermore, the rated flow of the filter is not less than the maximum design flow of the surge tank, and the rated pressure of the filter is not less than the maximum working pressure of the surge tank.

[0012] Furthermore, a differential pressure gauge is provided on the filter, and when the reading of the differential pressure gauge is greater than a threshold value, information for cleaning or replacing the filter screen is sent to the control box.

[0013] Furthermore, the control box includes a PLC and a box body, the box body is provided with a power interface and a network cable interface connected to the PLC, a transmission cable interface and a valve connection port, and the box body is provided with a display screen.

[0014] Furthermore, the PLC control system includes an analog input module, a digital output module and a filtering algorithm, and the filtering algorithm is used to suppress noise on signals of the first pressure sensor and the second pressure sensor.

[0015] Furthermore, the inverter adjustment includes: obtaining the actual value of the water supply pressure of the pressure regulating tank through the first pressure sensor; the PLC control system calculates the pressure deviation between the actual value of the water supply pressure of the pressure regulating tank and the preset value, and generates the inverter frequency adjustment instruction according to the pressure deviation; when the actual value of the water supply pressure is higher than the third preset threshold, reducing the frequency of the inverter to reduce the flow rate of the variable frequency pump; when the actual value of the water supply pressure is lower than the fourth preset threshold, increasing the frequency of the inverter to increase the flow rate of the variable frequency pump.

[0016] Furthermore, the pressure stabilizing tank includes a cylinder, the upper part of the cylinder is an elliptical head, the lower part is a flat head, and the lower part of the flat head is provided with supporting legs; the filter is made of 316L stainless steel, and the filter screen material of the filter is a stainless steel woven mesh.

[0017] Compared with the prior art, the pressure stabilizing tank provided by the present invention has the following beneficial effects:

[0018] ① By setting up a variable frequency pump, frequency converter, pressure sensor and PLC control system, the PLC control system can monitor the pressure of the pressure-surge tank and the air bag tank in real time through the pressure sensor, and accurately control the water pump flow and the opening and closing of the air pump through the variable frequency pump and frequency converter, so that the pressure-surge tank and the air bag tank can adapt to dynamic load changes and automatic pressure replenishment operations.

[0019] ② The filter is made of large stainless steel and is equipped with a differential pressure gauge. When the reading of the differential pressure gauge is greater than the threshold, a prompt is sent to the control box to clean or replace the filter, achieving high flow rate and impurity filtering functions, reducing water flow disturbance and ensuring system cleanliness.

[0020] ③ The air bag tank technology is used to avoid the pressure fluctuations and frequent air replenishment problems caused by gas-water mixing in traditional pressure-stabilizing tanks, which reduces the difficulty of maintenance and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0022] Figure 1 A system block diagram of a pressure stabilizing tank provided by an embodiment of the present invention;

[0023] Figure 2 The present invention provides a schematic diagram of the overall cross-sectional structure of a pressure-surge tank.

[0024] In the figure: 01 - pressure stabilizing tank, 02 - air bag tank, 03 - control box, 04 - first pressure sensor, 05 - second pressure sensor, 06 - air pump. DETAILED DESCRIPTION

[0025] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] Reference Figure 1 and Figure 2 As shown, a pressure-sustaining tank 01 disclosed in the present application includes: a pressure-sustaining tank 01 and a control box 03 configured for the pressure-sustaining tank 01, an airbag tank 02 is provided in the pressure-sustaining tank 01, and the control box 03 is provided with a PLC control system, and the control box 03 and the PLC control system are connected to a host computer; the set maximum pressure value in the pressure-sustaining tank 01, the minimum pressure value in the pressure-sustaining tank 01, the maximum pressure value in the airbag tank 02, and the minimum pressure value in the airbag tank 02 can be input on the host computer interface to issue automatic control instructions to the PLC control system; the pressure-sustaining tank 01 and the airbag tank 02 are also provided with pressure sensors for monitoring data information on the pressure and valve status of the pressure-sustaining tank 01 and the airbag tank 02; the control box 03 is provided with a remote / local mode for receiving control information from the host computer and controlling the opening and closing of the valves of the pressure-sustaining tank 01 and the airbag tank 02.

[0027] The upper computer control information is implemented based on the voltage stabilizing and regulating component, which includes: a variable frequency pump, a frequency converter and a first pressure sensor 04, wherein the variable frequency pump is used to absorb water from a water source and transport the water to the downstream system; the frequency converter is directly connected to the variable frequency pump motor to adjust its speed; the first pressure sensor 04 is arranged at the outlet of the pressure stabilizing tank 01, and is used to transmit the pressure signal to the PLC control system; the control box 03 is connected to the valves and control signal cables of the pressure stabilizing tank 01 and the airbag tank 02.

[0028] The pressure stabilizing and regulating component also includes an air pump 06 and a second pressure sensor 05 arranged on the air cavity side of the air bag tank 02. The second pressure sensor 05 is used to monitor the gas pressure in real time; when the second pressure sensor 05 detects that the pressure of the air bag tank 02 is less than the threshold, the PLC control system triggers the air pump 06 to start; if the continuous pressure replenishment time exceeds the set time and the pressure of the air bag tank 02 still does not reach the threshold, the PLC control system triggers an alarm signal and executes shutdown protection.

[0029] A large-volume filter is also installed in the pipeline between the variable frequency pump outlet and the inlet of the surge tank 01. The filter inlet is threadedly connected to the variable frequency pump outlet pipeline, and the filter outlet is connected to the inlet of the surge tank 01. The rated flow rate of the filter is not less than the maximum design flow rate of the surge tank 01, and the rated pressure of the filter is not less than the maximum operating pressure of the surge tank 01.

[0030] From this we can see that its workflow is as follows Figure 1 As shown: The host computer is connected to control box 03 via Ethernet. The maximum and minimum pressures in pressure-surge tank 01 and the maximum and minimum pressures in airbag tank 02 are entered into the interface to complete the PLC initialization parameter configuration. The variable frequency pump is started to operate at the initial frequency, and water flows through the filter into pressure-surge tank 01. The first pressure sensor 04 monitors the outlet pressure of pressure-surge tank 01 in real time. The PLC calculates the pressure deviation using the PID algorithm. If the pressure deviation exceeds the threshold, the PLC sends a command to reduce the frequency of the variable frequency drive, slowing the water pump and reducing the flow rate to achieve a pressure drop, completing the high-pressure regulation operation. If the pressure deviation is less than the threshold, the PLC sends a command to increase the frequency of the variable frequency drive, accelerating the water pump and increasing the flow rate to achieve a pressure rise, completing the low-pressure regulation operation.

[0031] The second pressure sensor 05 monitors the air cavity pressure of the air bag tank 02. If the air cavity pressure is lower than the threshold, the PLC starts the air pump 06 to replenish the pressure until the air cavity pressure is greater than the threshold. If the pressure replenishment continues for 5 minutes and still fails to meet the standard, the PLC triggers an alarm and cuts off the system power supply. The differential pressure gauge monitors the inlet and outlet pressure difference of the filter. When the pressure difference is greater than the threshold, the PLC sends a "filter blockage" alarm to the host computer, prompting to clean or replace the filter. The maintenance personnel manually opens the drain valve at the bottom of the filter to flush the filter. The local mode is to directly operate the valve opening and closing through the control box 03, such as manually closing the outlet valve of the pressure regulating tank 01 in an emergency; the remote mode is for the host computer to receive PLC data, monitor the pressure data in real time, and remotely adjust or trigger maintenance instructions.

[0032] Specifically, the rated flow rate of the filter is not less than the maximum design flow rate of the surge tank 01, and the rated pressure of the filter is not less than the maximum operating pressure of the surge tank 01. The PLC control system includes an analog input module, a digital output module, and a filtering algorithm, which is used to suppress noise from the signals of the first pressure sensor 04 and the second pressure sensor 05.

[0033] It can be seen that the PLC continuously monitors the pressure signal and the PID algorithm fine-tunes the frequency of the inverter to ensure that the pressure fluctuation is controlled within a small range. In one preferred embodiment, the maximum design flow rate of the surge tank 01 is 30m 3 / h, when selecting a filter, its rated flow rate must be greater than 30m 3 / h. For example, if the rated flow rate is 35m 3A stainless steel filter with a flow rate of 100 psi (100 psi) / h ensures water flow without excessive pressure drop. If the maximum operating pressure of the surge tank 01 is 4.0 MPa, a filter with a pressure resistance greater than 4.0 MPa must be selected. The filter is installed between the outlet of the variable frequency pump and the inlet of the surge tank 01, using a threaded connection to ensure a tight seal. Pressure differential gauges are installed at the inlet and outlet of the filter to monitor pressure differential changes in real time.

[0034] The PLC control system's hardware configuration is as follows: An 8-channel analog input module supports 4-20mA signal input. The first pressure sensor (04) is located at the outlet of the surge tank (01), and its signal is connected to AI 0. The second pressure sensor (05) is located in the air chamber of the airbag tank (02), and its signal is connected to AI 1. The sampling frequency is preferably 100Hz to ensure real-time performance. A 16-channel digital output module is used to control the start and stop of the frequency converter and the power supply of the air pump (06). In a preferred embodiment, DO0 controls the start / stop of the frequency converter; DO1 controls the start and stop of the air pump (06); and DO2 controls the filter clogging alarm indicator.

[0035] In one preferred embodiment, the filtering algorithm is implemented by using a moving average filter to average 10 consecutive sampling points to eliminate random noise. The low-pass filter cutoff frequency is set to 5 Hz to filter out high-frequency interference, such as motor vibration noise. A host computer display shows a real-time comparison of the signal before and after filtering, and the window size or cutoff frequency can be adjusted to balance response speed and noise suppression.

[0036] When operating, surge tank 01 must first be tested and verified. These tests include a no-load test, which involves closing the outlet valve to verify the system's ability to maintain the set pressure at zero flow; a sudden load test, which involves suddenly opening the terminal valve and observing the PLC's response time, e.g., 10 seconds or less for pressure recovery to the set value; and a filter differential pressure test, which involves manually plugging the filter to verify the timely triggering of the differential pressure alarm. An alarm is triggered if the differential pressure exceeds the threshold. Simultaneously, data is recorded, including pressure fluctuations, inverter frequency changes, and the number of starts and stops of air pump 06, for use in optimizing PID and filter parameters.

[0037] Specifically, the control box 03 includes a PLC and a housing. The housing is equipped with a power supply and network cable interface, a transmission cable interface, and a valve connection port for connection to the PLC. A display screen is also provided. The surge tank 01 comprises a cylinder with an elliptical upper end and a flat lower end, with legs positioned below the flat end. The filter is made of 316L stainless steel, and the filter screen is made of a stainless steel woven mesh.

[0038] From this we can see that its overall structure is as follows Figure 2As shown, it includes the following core components: a pressure-stabilizing tank 01, made of 304 stainless steel, with an elliptical upper end and a flat lower end, supported by welded legs at the bottom. An internally integrated airbag tank 02 separates the water and air cavities via an elastic airbag, achieving water-gas isolation. A control box 03 houses a built-in PLC control system, power supply, network cable, and multiplexed transmission cable interfaces. The panel is equipped with a touchscreen displaying real-time pressure, valve status, and alarm information. The pressure-stabilizing and regulating components include a variable-frequency pump, a frequency converter, a first pressure sensor 04, and a second pressure sensor 05. A large stainless steel filter with a 316L stainless steel woven mesh screen features flanged connections for the filter inlet and outlet, and a differential pressure gauge mounted at the bottom. A micro air pump 06 and the second pressure sensor 05 form a pressure-compensating device.

[0039] In one of the preferred embodiments, after the connection is completed, all pipeline connections need to be tested for air tightness and pressurized to 1.5 times the working pressure to prevent leakage. Use shielded cables and keep away from strong power lines to ensure stable sensor signals. The emergency stop button is integrated into the control box 03 so that the power can be cut off manually and quickly and conveniently. At the same time, the PID parameters and pressure stability are verified through no-load testing. A load test is performed to simulate a sudden change in water consumption and observe the response time. An alarm test is performed to manually trigger abnormalities such as filter blockage and insufficient airbag pressure to confirm that the alarm mechanism is effective.

[0040] The inlet of the variable frequency pump is connected to a water source, such as a municipal water supply or a water tank, via a pipeline. The outlet of the variable frequency pump is connected to the filter inlet via a flange or threaded connection. The filter inlet is directly connected to the outlet of the variable frequency pump, which is then flanged to the inlet of the surge tank 01. A differential pressure gauge is installed at the filter inlet and outlet to monitor the differential pressure. The inlet of the surge tank 01 is connected to the outlet of the filter, which is then connected to a water terminal, such as a building's water supply network, via a pipeline. The airbag tank 02 is integrated into the tank and connected to the air pump 06 via an air pipe. The outlet of the air pump 06 is connected to the air chamber of the airbag tank 02 via a pressure-resistant air pipe. The first pressure sensor 04 is installed in the outlet pipeline of the surge tank 01 to monitor the water supply pressure. The second pressure sensor 05 is installed in the air chamber of the airbag tank 02 to monitor the gas pressure. The signal input of the PLC control box 03 is connected to the analog signals of the first and second pressure sensors 05 via a shielded cable. The signal output is connected to the control terminals of the variable frequency drive and the air pump 06 via a cable. The host computer communicates with the PLC via an Ethernet interface to enable data monitoring and parameter setting.

[0041] In one preferred embodiment, the electrical connections are specifically configured such that the inverter input receives analog signals from the PLC to control the frequency; the output drives the variable frequency pump motor to adjust the speed. The first sensor outputs a signal to the PLC's AI0 channel, and the second sensor outputs a 4-20mA signal to the PLC's AI1 channel. The control terminal controls start and stop operations via the PLC's digital output. The differential pressure gauge output is connected to the PLC via a switch signal, such as a dry contact or analog signal, to trigger a filter blockage alarm. The PLC control box 03's Ethernet communication interface connects to the host computer for data transmission.

[0042] During operation of the surge tank 01, the interconnected relationship between the various components is as follows: the first pressure sensor 04 collects the outlet pressure of the surge tank 01 in real time. The PLC outputs a frequency command to the frequency converter based on the deviation between the set pressure and the collected pressure. This is specifically divided into frequency reduction and frequency increase. Simultaneously, the second pressure sensor 05 collects the pressure in the air chamber of the airbag tank 02 in real time. The PLC outputs a frequency command to the air pump 06 based on the deviation between the set pressure and the collected pressure. Specifically, if the real-time collected pressure is less than the set pressure, the PLC activates the air pump 06 to replenish the pressure. If the real-time collected pressure is greater than the set pressure, or if the pressure replenishment period exceeds a preset time (in this embodiment, 5 minutes), the pressure replenishment is terminated. Furthermore, if the real-time monitored pressure drops within a short period of time, an alarm is triggered to shut down the system. The specific filter maintenance process involves monitoring the filter inlet and outlet pressure differential using a differential pressure gauge that displays the real-time differential pressure. If the inlet and outlet pressure differential exceeds a threshold, an alarm is triggered. Specifically, the PLC sends a "filter clogged" signal to the host computer, prompting manual intervention, allowing maintenance personnel to clean or replace the filter and reset the system.

[0043] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media, including but not limited to magnetic disk storage, CD-ROM, optical storage, and the like, containing computer-usable program code.

[0044] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0045] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0046] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0047] 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 it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A surge tank, characterized in that: include: A pressure stabilizing tank and a control box configured for the pressure stabilizing tank, wherein the pressure stabilizing tank is provided with an air bag tank, and the control box is provided with a PLC control system, and the control box and the PLC control system are connected to a host computer; The maximum pressure value, minimum pressure value, maximum pressure value and minimum pressure value in the pressure regulating tank, air bag tank and air bag tank can be input into the upper computer interface to send automatic control instructions to the PLC control system. The pressure stabilizing tank and the air bag tank are also provided with pressure sensors for monitoring the pressure and valve status data of the pressure stabilizing tank and the air bag tank; The control box is provided with a remote / local mode for receiving control information from a host computer and controlling the opening and closing of the valves of the pressure stabilizing tank and the air bag tank.

2. A surge tank according to claim 1, characterized in that: The host computer control information is implemented based on a voltage stabilization and regulation component, and the voltage stabilization and regulation component includes: A variable frequency pump, a frequency converter, and a first pressure sensor, wherein the variable frequency pump is used to draw water from a water source and deliver the water to a downstream system; the frequency converter is directly connected to the variable frequency pump motor to adjust its speed; the first pressure sensor is provided at the outlet of the pressure regulating tank to transmit a pressure signal to the PLC control system; The control box is connected to the valves of the pressure stabilizing tank and the air bag tank and the control signal cable.

3. A surge tank according to claim 2, characterized in that: The pressure regulating assembly further includes an air pump and a second pressure sensor disposed on the air cavity side of the air bag tank, the second pressure sensor being used to monitor the gas pressure in real time; When the second pressure sensor detects that the air bag tank pressure is less than a threshold value, the PLC control system triggers the air pump to start; If the continuous pressure replenishment time exceeds the set time and the air bag tank pressure still does not reach the threshold, the PLC control system triggers an alarm signal and executes shutdown protection.

4. A surge tank according to claim 2, characterized in that: A large-volume filter is also provided on the pipeline between the variable frequency pump outlet and the pressure stabilizing tank inlet. The filter inlet end is threadedly connected to the variable frequency pump outlet pipeline, and the filter outlet end is connected to the pressure stabilizing tank inlet.

5. A surge tank according to claim 4, characterized in that: The rated flow of the filter is not less than the maximum design flow of the surge tank, and the rated pressure of the filter is not less than the maximum working pressure of the surge tank.

6. A surge tank according to claim 2 or 4, characterized in that: The filter is provided with a differential pressure gauge, and when the reading of the differential pressure gauge is greater than a threshold value, a message for cleaning or replacing the filter screen is sent to the control box.

7. A surge tank according to claim 2, characterized in that: The control box includes a PLC and a box body. The box body is provided with a power interface and a network cable interface connected to the PLC, a transmission cable interface and a valve connection port. The box body is provided with a display screen.

8. A pressure stabilizing tank according to claim 2 or 3, characterized in that: The PLC control system includes an analog input module, a digital output module and a filtering algorithm, and the filtering algorithm is used to suppress noise on signals of the first pressure sensor and the second pressure sensor.

9. The pressure stabilizing tank according to claim 2, characterized in that: The frequency converter adjustment includes: Acquiring the actual value of the water supply pressure of the pressure stabilizing tank through the first pressure sensor; The PLC control system calculates the pressure deviation between the actual value of the water supply pressure of the pressure stabilizing tank and the preset value, and generates the frequency adjustment instruction of the frequency converter according to the pressure deviation; When the actual value of the water supply pressure is higher than a third preset threshold, reducing the frequency of the frequency converter to reduce the flow rate of the variable frequency pump; When the actual value of the water supply pressure is lower than a fourth preset threshold, the frequency of the frequency converter is increased to increase the flow rate of the variable frequency pump.

10. The pressure stabilizing tank according to claim 4, characterized in that: The pressure stabilizing tank includes a cylinder, the upper part of the cylinder is an elliptical head, the lower part is a flat head, and the lower part of the flat head is provided with supporting legs; the filter is made of 316L stainless steel, and the filter screen of the filter is made of stainless steel woven mesh.

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