Water inlet pressure control system of ultrapure water machine

Abstract

The invention relates to the technical field of laboratory water purification equipment, in particular to a water inlet pressure control system of an ultrapure water machine. The water inlet pressure control system of the ultrapure water machine comprises a controller, a water inlet pipeline, a straight-through pipeline, a pressurizing pipeline and a pipeline control valve, the straight-through pipeline and the pressurizing pipeline are connected to the downstream of the water inlet pipeline in parallel, and the water inlet pipeline is sequentially connected with a pressure reducing valve and a first pressure detector in the water inlet direction, the pressurizing pipeline is connected with a pressurizing pump, the set pressure of the pressurizing pump is below a high limit value, and the pipeline control valve, the first pressure detector and the pressurizing pump are all electrically connected with the controller so that water flow can be controlled to enter the pressurizing pipeline when the detection value of the first pressure detector is smaller than a low limit value. And when the detection value of the first pressure detector is greater than or equal to a low limit value, the water flow is controlled to enter the straight pipeline. The water pressure is automatically balanced by controlling pipeline switching, and the outlet water pressure is controlled between a low limit value and a high limit value, so that the normal pressure range required by the operation of the ultrapure water machine is reached.

Description

Technical Field

[0001] This invention relates to the field of laboratory water purification equipment technology, and in particular to an ultrapure water system inlet water pressure control system. Background Technology

[0002] Laboratory ultrapure water systems are devices that produce ultrapure water. Their process involves removing solid impurities, salt ions, bacteria, and viruses from the water through filtration, reverse osmosis, electrodialysis, ion exchange, and ultraviolet sterilization. The inlet water for laboratory ultrapure water systems is typically industrial water, which is unstable in quality and experiences large pressure fluctuations. The starting and stopping of pumps in the water supply line, as well as the starting and stopping of multiple ultrapure water systems, can cause frequent water hammer effects. The inlet water pressure of the ultrapure water system needs to be maintained within a set range to ensure normal operation. If the instantaneous inlet water pressure is too high, it can lead to pressure gauge malfunction, cracking and perforation of pipelines, joints, and pressure tanks. High-pressure water jets can damage the inlet circuit board, or even cause short circuits and leakage, ultimately leading to ultrapure water system failure. If the inlet water pressure is below the lower limit of normal operation, the equipment can start, but the output pressure after booster pump pressurization will not reach the optimal pressure required by the reverse osmosis system, preventing the reverse osmosis system from operating at its best and affecting the quality of the output water.

[0003] Most existing ultrapure water systems are equipped with an inlet pressure regulation module. However, the regulation function is mainly focused on relieving pressure when the inlet pressure is too high, ensuring that the inlet pressure of the ultrapure water system does not exceed the upper limit and avoids malfunctions caused by excessive inlet pressure. However, the pressure relief operation can only ensure that the inlet pressure of the ultrapure water system after pressure relief does not exceed the upper limit, but cannot guarantee that the inlet pressure of the ultrapure water system after pressure relief does not fall below the lower limit. In addition, when the external water source pressure is too low, the inlet pressure regulation module cannot adjust the low pressure, resulting in the inlet pressure of the ultrapure water system being too low, below the lower limit. This, in turn, prevents the subsequent reverse osmosis system from operating in optimal condition, affecting the quality of the output water. Summary of the Invention

[0004] The purpose of this invention is to provide an inlet water pressure control system for an ultrapure water system, so as to solve the problem that the inlet water pressure adjustment module configured in existing ultrapure water systems can only adjust the inlet water pressure of the ultrapure water system to not exceed the upper limit, but cannot adjust the inlet water pressure of the ultrapure water system to not fall below the lower limit.

[0005] To achieve the above objectives, the ultrapure water system inlet water pressure control system of the present invention adopts the following technical solution: The ultrapure water system's inlet water pressure control system includes a controller, an inlet pipeline, a straight-through pipeline and a booster pipeline connected in parallel downstream of the inlet pipeline, and a pipeline control valve for controlling the switching between the straight-through pipeline and the booster pipeline. Along the inlet direction, a pressure reducing valve and a first pressure sensor are sequentially connected to the inlet pipeline to control the water flow pressure below a high limit. A booster pump is connected to the booster pipeline, with its set pressure below a high limit. The pipeline control valve, the first pressure sensor, and the booster pump are all electrically connected to the controller. This allows water to flow into the booster pipeline when the first pressure sensor's reading is less than a low limit, and into the straight-through pipeline when the first pressure sensor's reading is greater than or equal to the low limit.

[0006] Furthermore, the pipeline control valve includes a straight-through pipeline solenoid valve connected to the straight-through pipeline and a booster pipeline solenoid valve connected to the booster pipeline, wherein the straight-through pipeline solenoid valve and the booster pipeline solenoid valve are electrically connected to the controller.

[0007] Furthermore, the ultrapure water system's inlet water pressure control system also includes an outlet pipeline. The outlets of both the booster pipeline and the straight pipeline are connected to the inlet of the outlet pipeline. A second pressure detector is connected to the outlet pipeline near the outlet. The second pressure detector is electrically connected to the controller to control the booster pump to stop when the detected value of the second pressure detector is greater than the upper limit, and to control the booster pump to run when the detected value of the second pressure detector is equal to or less than the upper limit.

[0008] Furthermore, a downstream pressure stabilizing device is connected to the water outlet pipe, and the downstream pressure stabilizing device is located upstream of the second pressure detector.

[0009] Furthermore, a filter device is connected to the water outlet pipe, and the filter device is located upstream of the pressure stabilizing device.

[0010] Furthermore, the filtration device includes two or more stages of filters, with each stage of filters connected in sequence.

[0011] Furthermore, an upstream pressure stabilizing device is connected to the straight-through pipeline.

[0012] Furthermore, a pressure relief valve is provided on the water inlet pipeline downstream of the pressure reducing valve, and the pressure relief valve is located upstream of the first pressure detector.

[0013] Beneficial Effects: This invention presents a novel inlet water pressure control system for an ultrapure water system, representing a pioneering invention. By connecting a straight-through pipeline and a booster pipeline in parallel downstream of the inlet pipeline and installing a pipeline control valve, the controller can switch between the straight-through and booster pipelines. A pressure reducing valve on the inlet pipeline keeps the outlet water pressure below a high limit. If the inlet pressure exceeds the pressure reducing valve's set pressure, the valve automatically reduces the pressure. If the inlet pressure does not exceed the pressure reducing valve's set pressure, the water can flow directly through the valve, and the outlet pressure of the pressure reducing valve equals the inlet pressure, thus keeping the outlet water pressure below a high limit. A first pressure sensor is installed downstream of the pressure reducing valve on the inlet pipeline. The pressure detector is electrically connected to the controller, feeding back the detected pressure signal to the controller. The controller determines whether the detected value of the first pressure detector is less than the lower limit. If the detected value is less than the lower limit, the controller controls the water flow into the booster pipeline. A booster pump is connected to the booster pipeline. After the low-pressure water flows into the booster pipeline, it is boosted by the booster pump. The booster pump is set to a pressure below the upper limit, ensuring that the boosted water pressure does not exceed the upper limit and remains between the lower and upper limits. If the detected value is greater than or equal to the lower limit, the controller controls the water flow into the straight-through pipeline, ensuring that the water pressure flowing out of the straight-through pipeline is between the lower and upper limits. Using the ultrapure water machine inlet water pressure control system of this invention, regardless of whether the inlet water pressure is high, medium, or low, the controller can control the pipeline switching, automatically balancing the water pressure and controlling the outlet water pressure between the lower and upper limits. This ensures that the outlet water pressure reaches the normal pressure range required for the ultrapure water machine to operate, ensuring that the ultrapure water machine is in optimal working condition and extending its service life. Attached Figure Description

[0014] Figure 1 This is a connection diagram of the ultrapure water system inlet water pressure control system of the present invention; Figure 2 This is the intelligent control logic diagram of the ultrapure water system inlet water pressure control system of the present invention; Figure 3 This is a schematic diagram showing the connection between the ultrapure water inlet pressure control system of the present invention and multiple ultrapure water machines; In the diagram: 1. Inlet pipe; 2. Low-pressure switch; 3. Pressure reducing valve; 4. Pressure gauge; 5. Pressure relief valve; 6. First pressure sensor; 7. Controller; 8. Booster pipe solenoid valve; 9. Booster pipe; 10. Booster pump; 11. Straight-through pipe solenoid valve; 12. Upstream pressure stabilizing device; 13. Straight-through pipe; 14. Outlet pipe; 15. Multi-media filter; 16. Precision filter; 17. Downstream pressure stabilizing device; 18. Second pressure sensor. Detailed Implementation

[0015] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0016] Existing ultrapure water systems are equipped with inlet pressure regulation modules that can only adjust the inlet pressure to prevent it from exceeding the upper limit, but cannot adjust it to prevent it from falling below the lower limit, thus affecting the quality of the output water and the lifespan of the system. To solve this problem, this invention provides an ultrapure water system inlet pressure control system. Regardless of whether the inlet pressure is high, medium, or low, the controller can switch pipelines and automatically balance the water pressure, controlling the outlet pressure between the lower and higher limits. This ensures the outlet pressure reaches the normal operating pressure range required for the ultrapure water system, keeping it in optimal working condition and extending its lifespan.

[0017] The basic principle of the ultrapure water system inlet water pressure control system of this invention is as follows: By connecting a straight pipeline and a booster pipeline in parallel downstream of the inlet pipeline and setting a pipeline control valve, the controller can switch between the straight pipeline and the booster pipeline. The pressure reducing valve on the inlet pipeline controls the outlet water pressure below the high limit, and dynamically monitors whether the outlet water pressure is less than the low limit. When the outlet water pressure is less than the low limit, water flows into the booster pipeline connected to the booster pump. The booster pump's set pressure is below the high limit, thus ensuring that the boosted water pressure does not exceed the high limit and is between the low and high limits. When the outlet water pressure is greater than or equal to the low limit, water flows into the straight pipeline, ensuring that the outlet water pressure of the straight pipeline is between the low and high limits.

[0018] Based on the above-mentioned principles, the following details an embodiment of the ultrapure water system inlet water pressure control system of the present invention: like Figure 1As shown, the ultrapure water system's inlet water pressure control system includes a controller 7, an inlet pipe 1, a straight-through pipe 13, a booster pipe 9, and an outlet pipe 14. The inlet of the inlet pipe 1 is used to connect to an external water source. The straight-through pipe 13 and the booster pipe 9 are connected in parallel between the inlet pipe 1 and the outlet pipe 14. The outlet of the outlet pipe 14 is used to connect to the inlet of the ultrapure water system. The arrows in the diagram indicate the direction of water flow. Along the inlet direction, the inlet pipe 1 is sequentially connected to a low-pressure switch 2, a pressure reducing valve 3, a pressure gauge 4, a pressure relief valve 5, and a first pressure detector 6. The low-pressure switch 2 is used to control the on / off state of the inlet pipe 1. Pressure reducing valve 3 is used to reduce the water flow when the inlet pressure is too high. The pressure of pressure reducing valve 3 is set to not exceed the upper limit. When the inlet pressure of inlet pipe 1 is higher than the set pressure of pressure reducing valve 3, the water flow can be automatically reduced through pressure reducing valve 3. When the inlet pressure of inlet pipe 1 does not exceed the set pressure of pressure reducing valve 3, the water flow can directly pass through pressure reducing valve 3. The outlet water pressure of pressure reducing valve 3 is equal to the inlet water pressure, thus controlling the outlet water pressure of inlet pipe 1 below the upper limit. Pressure gauge 4 is provided for easy manual observation of the water flow pressure at the outlet of pressure reducing valve 3. If pressure reducing valve 3 cannot effectively control the outlet pressure within the upper limit, the excessive pressure can be released through pressure relief valve 5 to achieve pressure reduction and constant pressure. Pressure relief valve 5 achieves constant pressure relief, which is a mature existing technology and will not be described further here. The first pressure detector 6 is a pressure sensor, which is electrically connected to the controller 7. It is used to detect the water pressure at the outlet of the inlet pipe 1 in real time and feeds back the detected pressure signal value P1 to the controller 7. The controller 7 determines whether P1 is less than the lower limit value and then controls the switching of water flow into the booster pipe 9 or the straight pipe 13.

[0019] A straight-through pipeline 13 is sequentially equipped with a straight-through pipeline solenoid valve 11 and an upstream pressure stabilizing device 12. The straight-through pipeline solenoid valve 11 controls the opening and closing of the straight-through pipeline 13 and is electrically connected to the controller 7, which controls its opening and closing. The upstream pressure stabilizing device 12 is located downstream of the straight-through pipeline solenoid valve 11 and can stabilize the water flow in the straight-through pipeline 13, thus achieving pressure stabilization. The upstream pressure stabilizing device 12 is specifically a pressure stabilizing tank, which is existing technology and will not be described here. Of course, pressure stabilizing tanks or other pressure stabilizing devices can also be used. A booster pipeline 9 is sequentially equipped with a booster pipeline solenoid valve 8 and a booster pump 10. The booster pipeline solenoid valve 8 controls the opening and closing of the booster pipeline 9 and is electrically connected to the controller 7, which controls its opening and closing. The booster pump 10 is used to boost the low-pressure water flow, and the set pressure of the booster pump 10 does not exceed the upper limit value. The booster pump 10 is electrically connected to the controller 7, and the controller 7 controls its operation and shutdown.

[0020] The first pressure sensor 6 is electrically connected to the controller 7, and it monitors in real time whether the water pressure P1 at the outlet of the inlet pipe 1 is less than the lower limit. The control logic can be found in [reference]. Figure 2If P1 < the lower limit, the solenoid valve 11 of the direct pipeline is closed, the solenoid valve 8 of the booster pipeline is opened, and the booster pump 10 is operated to allow water to flow into the booster pipeline 9 for pressurization, so that the outlet water pressure of the booster pipeline 9 is between the lower and higher limits. If P1 ≥ the lower limit, the solenoid valve 8 of the booster pipeline is closed, the solenoid valve 11 of the direct pipeline is opened, and the water flows directly into the direct pipeline 13, so that the outlet water pressure of the direct pipeline 13 is between the lower and higher limits.

[0021] A filter device, a downstream pressure stabilizing device 17, and a second pressure sensor 18 are sequentially connected to the outlet pipe 14. The second pressure sensor 18 is located near the outlet on the outlet pipe 14. It is a pressure sensor electrically connected to the controller 7 and is used to detect the outlet water pressure of the outlet pipe 14 in real time. It feeds back the detected pressure signal value P2 to the controller 7. The control logic can be found in [reference needed]. Figure 2 The controller 7 determines whether P2 is greater than the upper limit. If P2 > the upper limit, it controls the booster pump 10 to stop; if P2 ≤ the upper limit, it controls the booster pump 10 to run. This control process ensures that the water pressure at the outlet of the water pipe 14 is as close to the upper limit as possible without exceeding it, providing better protection for the ultrapure water system and extending its service life. Furthermore, the combined use of the booster pump 10, the downstream pressure stabilizing device, and the second pressure sensor 18 avoids frequent start-stop cycles of the booster pump 10, extending its service life and protecting the ultrapure water system.

[0022] In this embodiment, the lower limit is set to 1 kg pressure and the upper limit to 4 kg pressure, based on the normal operating inlet pressure range of the ultrapure water machine. Of course, in practical applications, different lower and upper limits can be set according to the normal operating inlet pressure range of different ultrapure water machines. The downstream pressure stabilizing device is used to stabilize the water flow in the outlet pipe 14, preventing large fluctuations in the inlet water pressure of the ultrapure water machine from affecting its stable operation. The downstream pressure stabilizing device 17 is specifically a pressure stabilizing tank, which is existing technology and will not be described here. Alternatively, a pressure stabilizing tank or other pressure stabilizing equipment can be used. The filtration device is used to filter and purify the water flow, thereby improving the inlet water quality of the ultrapure water machine, which helps extend the service life of the ultrapure water machine and reduce its operating costs.

[0023] The filtration device includes a multi-media filter 15 and a precision filter 16 connected in sequence for pretreatment of water, including primary purification and removal of organic matter. The multi-media filter 15 is filled with anthracite, quartz sand, gravel, and activated carbon, stacked in layers to remove large suspended solids, meeting the water quality requirements for deep purification. It is reusable and has a long service life. The precision filter 16 uses a PP melt-blown filter element, effectively removing suspended solids, particles, rust, and other impurities from the raw water. This treatment process minimizes the impact between each treatment step, resulting in better water treatment and improved influent water quality for the ultrapure water system. Alternatively, in other embodiments, the filtration device may include three or more stages of filters connected in sequence to further enhance filtration and purification, improving the influent water quality for the ultrapure water system; the filtration device may also include only one stage of filters.

[0024] This invention relates to an ultrapure water system inlet water pressure control system. By monitoring the inlet and outlet water pressures, and based on the set lower limit of the inlet pressure and upper limit of the outlet pressure, the system controls the start and stop of the booster pump and the switching of the flow path. Combined with the action of the pressure stabilizing tank, this ensures that the outlet water pressure reaches the stable pressure required for the ultrapure water system's inlet. Controller 7 is the core of the ultrapure water system inlet water pressure control system, controlling the entire system's data acquisition, comparison calculations, and the opening and closing of the low-pressure switch and solenoid valve. The central control module of controller 7 is a microcontroller. The pressure sensor used is a SIN-P300 sensor.

[0025] The ultrapure water system inlet water pressure control system of this invention can be connected to multiple ultrapure water systems simultaneously, such as... Figure 3 As shown in the diagram, the arrows indicate the direction of water flow. This system provides automatic safety protection for multiple ultrapure water systems, automatically balancing water pressure without the need for manual supervision or professional disassembly and maintenance. It enables the automatic operation of the ultrapure water system's inlet water pressure control system, significantly improving operational efficiency and saving users valuable time and energy, allowing them to focus more on the development of their core business.

[0026] In the above embodiment, a straight-through solenoid valve is provided on the straight-through pipeline, and a booster solenoid valve is provided on the booster pipeline. Both the straight-through and booster solenoid valves are electrically connected to the controller. Together, they form a pipeline control valve, and pipeline switching is achieved by controlling the opening and closing of these two valves. In other embodiments, a three-way valve can also be used to control the switching between the straight-through and booster pipelines. One port of the three-way valve is connected to the inlet outlet of the water pipeline, and the other two ports are connected to the straight-through pipeline and the booster pipeline, respectively.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. An ultrapure water system inlet water pressure control system, characterized in that: The system includes a controller, an inlet pipe, a straight pipe and a booster pipe connected in parallel downstream of the inlet pipe, and a pipe control valve for switching between the straight pipe and the booster pipe. The inlet pipe is connected in sequence along the water inlet direction to a pressure reducing valve and a first pressure detector for controlling the water flow pressure below the upper limit. The booster pipe is connected to a booster pump with a set pressure below the upper limit. The pipe control valve, the first pressure detector, and the booster pump are all electrically connected to the controller to control the water flow into the booster pipe when the detection value of the first pressure detector is less than the lower limit, and to control the water flow into the straight pipe when the detection value of the first pressure detector is greater than or equal to the lower limit.

2. The ultrapure water system inlet water pressure control system according to claim 1, characterized in that: The pipeline control valve includes a straight-through pipeline solenoid valve connected to the straight-through pipeline and a booster pipeline solenoid valve connected to the booster pipeline. The straight-through pipeline solenoid valve and the booster pipeline solenoid valve are electrically connected to the controller.

3. The ultrapure water system inlet water pressure control system according to claim 1, characterized in that: The ultrapure water system's inlet water pressure control system also includes an outlet pipeline. The outlets of the booster pipeline and the straight pipeline are both connected to the inlet of the outlet pipeline. A second pressure detector is connected to the outlet pipeline near the outlet. The second pressure detector is electrically connected to the controller to control the booster pump to stop when the detected value of the second pressure detector is greater than the upper limit, and to control the booster pump to run when the detected value of the second pressure detector is equal to or less than the upper limit.

4. The ultrapure water system inlet water pressure control system according to claim 3, characterized in that: A downstream pressure stabilizing device is connected to the water outlet pipe, and the downstream pressure stabilizing device is located upstream of the second pressure detector.

5. The ultrapure water system inlet water pressure control system according to claim 4, characterized in that: A filter device is connected to the water outlet pipe, and the filter device is located upstream of the pressure stabilizing device.

6. The ultrapure water system inlet water pressure control system according to claim 5, characterized in that: The filtration device includes two or more stages of filters, with each stage connected in sequence.

7. The ultrapure water system inlet water pressure control system according to any one of claims 1-6, characterized in that: An upstream pressure stabilizing device is connected to the straight-through pipeline.

8. The ultrapure water system inlet water pressure control system according to any one of claims 1-6, characterized in that: A pressure relief valve is installed downstream of the pressure reducing valve on the water inlet pipeline, and the pressure relief valve is located upstream of the first pressure detector.

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