Automatic concentrated water recycling system for pure water preparation workshop

Abstract

The utility model provides an automatic concentrated water recycling system for a pure water preparation workshop, which comprises a first collecting and blending water tank and a second collecting and blending water tank which are connected to a pure water preparation system through a concentrated water pump and are respectively connected to a tap water supply system through a first electromagnetic valve and a second electromagnetic valve, a first on-line conductivity meter and a second on-line conductivity meter are respectively in interlocking control with a first electromagnetic valve and a second electromagnetic valve and are respectively connected to an inlet of a first precision filter through a third electromagnetic valve and a fourth electromagnetic valve, a first liquid level meter and the third electromagnetic valve are respectively in interlocking control, and a second liquid level meter and the third electromagnetic valve are respectively in interlocking control with the third electromagnetic valve and the fourth electromagnetic valve. And the first precision filter is connected to a production water unit through a water outlet collecting pipe via a water supply pump. Through the interlocking control of the online conductivity meter, the liquid level meter and the electromagnetic valve and the interlocking control of the pressure meter and the water supply pump, the effects of automatically recycling concentrated water, saving water resources and reducing the production cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of concentrated water recovery, in particular to a concentrated water automatic recovery and utilization system for a pure water preparation workshop. Background Art

[0002] Pure water plays a vital role in many production processes. Currently, processes commonly used in pure water production include ultrafiltration (UF) and reverse osmosis (RO). These technologies inevitably produce rinse water and a certain proportion of brine. Pure water production plants typically use tap water as their raw water. Because this raw water is generally of good quality, some brine meets discharge standards. However, due to the high cost of brine treatment, the current treatment approach is to directly discharge this brine. However, this not only increases wastewater emissions but also wastes water resources, which is particularly detrimental to the environment for pure water production processes with high brine production.

[0003] Therefore, it is necessary to design an automatic concentrated water recycling system for a pure water preparation workshop. Utility Model Content

[0004] The utility model provides an automatic recovery and utilization system for concentrated water in a pure water preparation workshop, which is mainly used to solve the problem of waste of water resources caused by direct discharge of concentrated water in existing pure water preparation workshops, thereby achieving the effect of automatic recovery and utilization of concentrated water, saving water resources and reducing production costs.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A concentrated water automatic recycling system for a pure water preparation workshop comprises a first collecting and distributing water tank, a second collecting and distributing water tank and a first precision filter, the tops of the first collecting and distributing water tank and the second collecting and distributing water tank are both provided with a concentrated water recovery pipe and a tap water distributing pipe, the concentrated water recovery pipe is provided with a concentrated water pump, the tap water distributing pipe is provided with a first solenoid valve and a second solenoid valve, the first collecting and distributing water tank and the second collecting and distributing water tank are connected to a pure water preparation system via the concentrated water recovery pipe via the concentrated water pump, and are connected to a tap water supply system via the tap water distributing pipe via the first solenoid valve and the second solenoid valve respectively, the first collecting and distributing water tank and the second distributing water tank are respectively provided with a first online conductivity meter and a second online conductivity meter, the first online conductivity meter and The first solenoid valves are interlocked with each other, and the second online conductivity meter is interlocked with the second solenoid valve. The third solenoid valve and the fourth solenoid valve are respectively provided on the outlet pipes at the bottom of the first collecting and distributing water tank and the second collecting and distributing water tank, and are connected to the inlet of the first precision filter through the third solenoid valve and the fourth solenoid valve respectively through the outlet pipes. The first collecting and distributing water tank and the second collecting and distributing water tank are respectively provided with a first liquid level gauge and a second liquid level gauge. The first liquid level gauge is interlocked with the third solenoid valve, and the second liquid level gauge is interlocked with the fourth solenoid valve. An outlet collection pipe is provided at the outlet of the first precision filter, and a water supply pump is provided on the water collection pipe, which is connected to the production water unit through the water supply pump through the water collection pipe.

[0007] A further solution is that a first throttle valve and a second throttle valve are respectively provided on the concentrated water recovery pipes of the first collecting and distributing water tank and the second collecting and distributing water tank, and the first throttle valve and the second throttle valve are not opened at the same time.

[0008] A further solution is that the action condition for the first throttle valve to switch from an open position to a closed position is set to: the liquid level of the concentrated water in the first collection and distribution water tank reaches 4.3m.

[0009] The action condition for the second throttle valve to switch from an open position to a closed position is set as: the liquid level of the concentrated water in the second collection and distribution water tank reaches 4.3m.

[0010] A further solution is that the conductivity thresholds of the first online conductivity meter and the second online conductivity meter are both set to 600 us / cm.

[0011] The action condition for the first solenoid valve to switch from an open position to a closed position is set as: the conductivity of the concentrated water in the first collection and adjustment water tank is less than the conductivity threshold.

[0012] The action condition for the second solenoid valve to switch from an open position to a closed position is set as: the conductivity of the concentrated water in the second collection and adjustment water tank is less than the conductivity threshold.

[0013] A further solution is that the liquid level thresholds of the first liquid level gauge and the second liquid level gauge are both set to 0.6m.

[0014] The action condition for the third solenoid valve to switch from an open position to a closed position is set as: the liquid level of the concentrated water in the first collection and adjustment water tank is less than the liquid level threshold.

[0015] The action condition for the fourth solenoid valve to switch from an open position to a closed position is set as: the liquid level of the concentrated water in the second collection and adjustment water tank is less than the liquid level threshold.

[0016] The third solenoid valve and the fourth solenoid valve are not opened at the same time.

[0017] A further solution is that the filtration accuracy of the first precision filter is 30-50um, and the operating pressure is 0.1-0.6Mpa, and a fifth solenoid valve is provided at the inlet.

[0018] A further solution is that the pressure difference threshold of the inlet and outlet of the first precision filter is set to 0.05-0.07 MPa.

[0019] The opening condition of the fifth solenoid valve is set as: the inlet and outlet pressure difference of the first precision filter is within the pressure difference threshold.

[0020] A further solution is that a pressure gauge is further provided on the water outlet collecting pipe, and the pressure gauge is interlocked with the water supply pump, and its pressure threshold is set to 0.35-0.4 MPa.

[0021] The condition for reducing the working power of the water supply pump is set as: the pressure value of the pressure gauge is higher than the pressure threshold.

[0022] The condition for increasing the working power of the water supply pump is set as: the pressure value of the pressure gauge is lower than the pressure threshold.

[0023] A further solution is that the tops of the first collecting and distributing water tank and the second collecting and distributing water tank are both provided with overflow connecting ports and external overflow ports, and the bottoms thereof are both provided with drain ports.

[0024] A further solution is that the liquid level heights of the overflow communication port, the external overflow port, and the emptying port are 4.6m, 4.8m, and 0.2m respectively.

[0025] It can be seen that the present invention has the following beneficial effects:

[0026] 1. The utility model collects the concentrated water and flushing water generated in the pure water preparation process in the pure water workshop through pipes and pumps them into the first collection and allocation water tank or the second collection and allocation water tank, and monitors the conductivity of the concentrated water in the water tank in real time through an online conductivity meter, injects tap water through a control solenoid valve to condition the concentrated water, and further filters the conditioned concentrated water through a precision filter and supplies the clean water to the production water workshop through a water pump, thereby realizing the recycling and effective treatment of the concentrated water generated in the pure water workshop, and utilizing the treated clean water resources in the actual production water link, which not only significantly reduces the high sewage discharge costs and saves a lot of capital costs, but also saves the tap water costs originally used for production through the rational use of concentrated water, further optimizing the water resource allocation and cost control in the production process.

[0027] 2. The utility model uses an online conductivity meter to accurately condition the concentrated water in the water tank, and further filters the concentrated water through a precision filter. Compared with the existing production water, the clean water produced after filtration is purer and more stable, with extremely low content of various pollutants and impurities, which fully meets the requirements of production water.

[0028] 3. The utility model realizes fully automated control of concentrated water conditioning, filtration and water supply pump power adjustment in the system through interlocking control of the online conductivity meter and the solenoid valve, interlocking control of the liquid level meter and the solenoid valve, and interlocking control of the pressure gauge and the water supply pump. It can operate stably for a long time without human supervision, greatly reducing the risk of human operational errors.

[0029] 4. The concentrated water pump, water supply pump and precision filter of the utility model all adopt a standby mode of one in use and one in reserve. When the working pump fails or needs maintenance, the standby pump can be put into use immediately, ensuring that the continuous operation of the system is not affected and improving the reliability of the system.

[0030] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the concentrated water automatic recycling system of the utility model embodiment Figure 1 .

[0032] Figure 2 This is a schematic diagram of the concentrated water automatic recycling system of the utility model embodiment Figure 2 .

[0033] The system components listed in the attached figure are as follows:

[0034] 10: Concentrate pump; 20: Water supply pump; 201: First check valve; 202: Second check valve;

[0035] 12: pressure gauge; 301: first collection and distribution water tank; 302: second collection and distribution water tank;

[0036] 401: first liquid level gauge; 402: second liquid level gauge;

[0037] 501: first online conductivity meter; 502: second online conductivity meter;

[0038] 601: first electromagnetic flowmeter; 602: first electromagnetic flowmeter; 603: third electromagnetic flowmeter;

[0039] 604: fourth electromagnetic flowmeter;

[0040] 801: first solenoid valve; 802: second solenoid valve; 803: third solenoid valve;

[0041] 804: fourth solenoid valve; 805: fifth solenoid valve; 806: sixth solenoid valve;

[0042] 901: first throttle valve; 902: second throttle valve;

[0043] 110: precision filter; 1101: first precision filter; 1102: second precision filter;

[0044] 100: Recovery system; 200: Pure water preparation system; 300: Production water unit. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] An embodiment of a concentrated water automatic recycling system for a pure water preparation workshop

[0047] See also Figure 1-2The utility model relates to an automatic recovery and utilization system of concentrated water for a pure water preparation workshop, comprising a first collecting and distributing water tank 301, a second collecting and distributing water tank 302 and a first precision filter 1101. The tops of the first collecting and distributing water tank 301 and the second collecting and distributing water tank 302 are both provided with a concentrated water recovery pipe and a tap water distributing pipe. The concentrated water recovery pipe is provided with a concentrated water pump 10, and the tap water distributing pipe is provided with a first solenoid valve 801 and a second solenoid valve 802. The first collecting and distributing water tank 301 and the second collecting and distributing water tank 302 are connected to the pure water preparation system 200 through the concentrated water recovery pipe via the concentrated water pump 10, and are connected to the tap water supply system through the tap water distributing pipe via the first solenoid valve 801 and the second solenoid valve 802 respectively. The first collecting and distributing water tank 301 and the second distributing water tank are respectively provided with a first online conductivity meter 501 and a second online conductivity meter 502. The first online conductivity meter 501 and the second online conductivity meter 502 are respectively provided. The instrument 501 is interlocked with the first solenoid valve 801, and the second online conductivity meter 502 is interlocked with the second solenoid valve 802. The third solenoid valve 803 and the fourth solenoid valve 804 are respectively provided on the outlet pipes at the bottom of the first collecting and distributing water tank 301 and the second collecting and distributing water tank 302, and are connected to the inlet of the first precision filter 1101 through the third solenoid valve 803 and the fourth solenoid valve 804 respectively through the outlet pipes. The first collecting and distributing water tank 301 and the second collecting and distributing water tank 302 are respectively provided with a first liquid level gauge 401 and a second liquid level gauge 402. The first liquid level gauge 401 is interlocked with the third solenoid valve 803, and the second liquid level gauge 402 is interlocked with the fourth solenoid valve 804. An outlet water collecting pipe is provided at the outlet of the first precision filter 1101, and a water supply pump 20 is provided on the water outlet collecting pipe, which is connected to the production water unit 300 through the water supply pump 20.

[0048] Specifically, in this embodiment, the first collection and distribution water tank 301 and the second collection and distribution water tank 302 are pumped into the pure water preparation system 200 through the concentrate pump 10 to generate concentrated water and flushing water during the pure water preparation process, which includes but is not limited to UF backwash water, UF concentrate water, primary RO flushing water and secondary RO flushing water. Ultrafiltration (UF) and reverse osmosis (RO) are two water treatment technologies in the pure water preparation process.

[0049] Specifically, in this embodiment, the concentrated water pump 10 and the water supply pump 20 respectively adopt two pumps to realize a backup mode of one in use and one in reserve. When the working pump fails or needs maintenance, the reserve pump can be put into use immediately to ensure the continuous operation of the recovery system 100 is not affected and improve the reliability of the recovery system 100.

[0050] In this embodiment, a first throttle valve 901 and a second throttle valve 902 are respectively provided on the concentrated water recovery pipes of the first collecting and distributing water tank 301 and the second collecting and distributing water tank 302, and the first throttle valve 901 and the second throttle valve 902 are not opened at the same time.

[0051] Specifically, the brine recovery pipe in this embodiment is further provided with a first electromagnetic flowmeter 601 , which is used to monitor the flow of brine in the brine recovery pipe and upload the collected flow data to the control center.

[0052] Specifically, in this embodiment, the first throttle valve 901 and the second throttle valve 902 are both manual butterfly valves. This method is only exemplary and not the only method. The throttling purpose can be achieved by using other types of throttle valves.

[0053] In this embodiment, the operating condition for the first throttle valve 901 to switch from an open position to a closed position is set as: the liquid level of the concentrated water in the first collection and distribution water tank 301 reaches 4.3 m.

[0054] The operating condition for the second throttle valve 902 to switch from an open position to a closed position is set as follows: the liquid level of the concentrated water in the second collection and distribution water tank 302 reaches 4.3 m.

[0055] Specifically, in this embodiment, the first throttle valve 901 and the second throttle valve 902 are alternately opened / closed according to the liquid level in the tank. For example, initially, the first throttle valve 901 is opened and the second throttle valve 902 is closed to inject concentrated water into the first collecting and distributing water tank 301. When the concentrated water in the first collecting and distributing water tank 301 reaches the target liquid level of 4.3m, the first throttle valve 901 is closed and the second throttle valve 902 is opened to inject concentrated water into the second collecting and distributing water tank 302. At the same time, when the liquid level of the concentrated water in the first collecting and distributing water tank 301 modulated with tap water meets the opening condition of the third solenoid valve 803, the third solenoid valve 803 is opened, and the concentrated water in the first collecting and distributing water tank 301 passes through the first precision filter 1101 or the second precision filter 1102. After filtration by the precision filter 1102, the concentrated water is supplied to the production water unit by the water supply pump 20. At this time, the liquid level of the concentrated water in the first collecting and distributing water tank 301 gradually decreases; when the concentrated water in the second collecting and distributing water tank 302 reaches the target liquid level of 4.3m, the second throttle valve 902 is closed and the first throttle valve 901 is opened, and the concentrated water is re-injected into the first collecting and distributing water tank 301. At the same time, when the liquid level of the concentrated water in the second collecting and distributing water tank 302 modulated with tap water meets the opening condition of the fourth solenoid valve 804, the fourth solenoid valve 804 is opened, and the concentrated water in the second collecting and distributing water tank 302 is filtered by the first precision filter 1101 or the second precision filter 1102 and supplied to the production water unit by the water supply pump 20, and the above steps are repeated.

[0056] In this embodiment, the conductivity thresholds of the first online conductivity meter 501 and the second online conductivity meter 502 are both set to 600 μs / cm.

[0057] The operating condition for the first solenoid valve 801 to switch from the open position to the closed position is set as: the conductivity of the concentrated water in the first collection and adjustment water tank 301 is less than the conductivity threshold.

[0058] The operating condition for the second solenoid valve 802 to switch from the open position to the closed position is set as: the conductivity of the concentrated water in the second collection and adjustment water tank 302 is less than the conductivity threshold.

[0059] Specifically, a second electromagnetic flowmeter 602 is provided at the front end of the first solenoid valve 801 on the tap water distribution pipe described in this embodiment, and a third electromagnetic flowmeter 603 is provided at the front end of the second solenoid valve 802. The second electromagnetic flowmeter 602 and the third electromagnetic flowmeter 603 are respectively used to monitor the flow rate of tap water flowing into the first collection and distribution water tank 301 and the second collection and distribution water tank 302, and upload the collected flow data to the control center.

[0060] Specifically, in this embodiment, the first online conductivity meter 501 and the second online conductivity meter 502 are used to measure and monitor the conductivity of the concentrated water in the first collection and distribution water tank 301 and the second collection and distribution water tank 302 in real time, respectively, and to appropriately adjust the water quality of the concentrated water in the tank as needed through the interlocking control of the solenoid valve.

[0061] Specifically, in this embodiment, the conductivity of the concentrated water output from the first collection and distribution water tank 301 or the second collection and distribution water tank 302 is set to ≤600 μs / cm.

[0062] Specifically, in this embodiment, the interlocking control process between the online conductivity meter and the solenoid valve is as follows: Initially, the first solenoid valve 801 is closed. When the first online conductivity meter 501 detects that the conductivity of the brine in the first collection and conditioning water tank 301 is greater than 600 μs / cm, the first online conductivity meter 501 sends an electrical signal to control the first solenoid valve 801 to open, injecting tap water into the first collection and conditioning water tank 301 for conditioning. This process continues until the conductivity of the brine in the tank reaches ≤ 600 μs / cm, at which point the first solenoid valve 801 is controlled to close. The process by which the second online conductivity meter 502 monitors the conductivity of the brine in the second collection and conditioning water tank 302 and controls the second solenoid valve 802 for water conditioning is consistent with the above process and will not be further described.

[0063] In this embodiment, the liquid level thresholds of the first liquid level gauge 401 and the second liquid level gauge 402 are both set to 0.6 m.

[0064] The operating condition for the third solenoid valve 803 to switch from the open position to the closed position is set as: the liquid level of the concentrated water in the first collection and adjustment water tank 301 is lower than the liquid level threshold.

[0065] The operating condition for the fourth solenoid valve 804 to switch from the open position to the closed position is set as: the liquid level of the concentrated water in the second collection and adjustment water tank 302 is lower than the liquid level threshold.

[0066] The third solenoid valve 803 and the fourth solenoid valve 804 are not opened at the same time.

[0067] Specifically, the first liquid level gauge 401 and the second liquid level gauge 402 of this embodiment are used to detect the liquid levels of the first collecting and distributing water tank 301 and the second collecting and distributing water tank 302, respectively. The interlocking control process of the liquid level gauge and the solenoid valve is: initially, the third solenoid valve 803 and the fourth solenoid valve 804 are both open. When the first liquid level gauge 401 detects that the liquid level of the first collecting and distributing water tank 301 is ≥0.6m, the third solenoid valve 803 opens. At this time, the concentrated water enters the first precision filter 1101 / the second precision filter 1102 for filtration and is then supplied to the production water unit 300 by the water supply pump 20. The liquid level of the first collecting and distributing water tank 301 gradually decreases until it is less than 0.6m. The first liquid level gauge 401 sends an electrical signal to control the third solenoid valve 803 to close. The process of the second liquid level gauge 402 detecting the liquid level of the second collecting and distributing water tank 302 and controlling the opening / closing of the fourth solenoid valve 804 is consistent with the above and will not be repeated. As can be seen from the above, concentrated water will not be injected into the second collection and allocation water tank 302 until the concentrated water injected into the first collection and allocation water tank 301 reaches the target liquid level, and the two water tanks are controlled by the regulating valve to inject concentrated water alternately, so the third solenoid valve 803 and the fourth solenoid valve 804 are not opened at the same time.

[0068] In this embodiment, the filtration accuracy of the first precision filter 1101 is 30-50 μm, and the operating pressure is 0.1-0.6 MPa. A fifth solenoid valve 805 is provided at the inlet thereof.

[0069] Specifically, this embodiment further includes a second precision filter 1102 . The first precision filter 1101 and the second precision filter 1102 serve as backup for each other. A sixth solenoid valve 806 is provided at the inlet of the second precision filter 1102 .

[0070] Specifically, in this embodiment, a first check valve 201 and a second check valve 202 are respectively provided at the outlets of the first precision filter 1101 and the second precision filter 1102 to prevent the filtered clean water from flowing back, so as to protect the precision filter 110 and maintain the system pressure.

[0071] In this embodiment, the pressure difference thresholds of the inlet and outlet of the first precision filter 1101 and the second precision filter 1102 are both set to 0.05-0.07 MPa.

[0072] The opening action condition of the fifth solenoid valve 805 is set to: the inlet and outlet pressure difference of the first precision filter 1101 is within the pressure difference threshold.

[0073] The opening action condition of the sixth solenoid valve 806 is set to: the inlet and outlet pressure difference of the second precision filter 1102 is within the pressure difference threshold.

[0074] Specifically, in this embodiment, the first precision filter 1101 and the second precision filter 1102 are used in a backup configuration, so the fifth solenoid valve 805 and the sixth solenoid valve 806 are not opened at the same time. When the fifth solenoid valve 805 and the sixth solenoid valve 806 are closed simultaneously, the third solenoid valve 803 and the fourth solenoid valve 804 are also closed, and the control center issues an alarm signal.

[0075] In this embodiment, a pressure gauge 12 is further provided on the water outlet collecting pipe. The pressure gauge 12 is interlocked with the water supply pump 20 and its pressure threshold is set to 0.35-0.4 MPa.

[0076] Specifically, the water outlet collecting pipe in this embodiment is further provided with a fourth electromagnetic flowmeter 604 , which is used to monitor the flow rate of the clean water flowing into the water supply pump 20 and upload the collected flow data to the control center.

[0077] The condition for reducing the working power of the water supply pump 20 is set as: the pressure value of the pressure gauge 12 is higher than the pressure threshold.

[0078] The condition for increasing the working power of the water supply pump 20 is set as: the pressure value of the pressure gauge 12 is lower than the pressure threshold.

[0079] Specifically, the pressure gauge 12 of this embodiment is used to detect the water pressure in the water outlet collecting pipe. The interlocking control process between the pressure gauge 12 and the water supply pump 20 is as follows: when the water pressure value detected by the pressure gauge 12 is higher than 0.4 MPa, the operating power of the water supply pump 20 is controlled to decrease until the pressure threshold requirement is met; when the value of the pressure gauge 12 is lower than 0.35 MPa, the operating power of the water supply pump 20 is controlled to increase until the pressure threshold requirement is met.

[0080] In this embodiment, the tops of the first collecting and distributing water tank 301 and the second collecting and distributing water tank 302 are both provided with overflow communication ports and external overflow ports, and the bottoms thereof are both provided with drain ports.

[0081] In this embodiment, the liquid levels of the overflow communication port, the external overflow port, and the drain port are 4.6 m, 4.8 m, and 0.2 m, respectively.

[0082] Specifically, in this embodiment, the concentrated water flowing out of the external overflow port and the drain port can flow into the ditch of the pure water workshop along the pipeline.

[0083] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A concentrated water automatic recycling system for a pure water preparation workshop, characterized in that: include: The first collecting and distributing water tank, the second collecting and distributing water tank and the first precision filter, the top of the first collecting and distributing water tank and the second collecting and distributing water tank are both provided with a concentrated water recovery pipe and a tap water distributing pipe, the concentrated water recovery pipe is provided with a concentrated water pump, the tap water distributing pipe is provided with a first solenoid valve and a second solenoid valve, the first collecting and distributing water tank and the second collecting and distributing water tank are connected to the pure water preparation system through the concentrated water recovery pipe and the concentrated water pump, and are connected to the tap water supply system through the tap water distributing pipe via the first solenoid valve and the second solenoid valve respectively, the first collecting and distributing water tank and the second distributing water tank are respectively provided with a first online conductivity meter and a second online conductivity meter, the first online conductivity meter and the first solenoid valve are interlocked with each other. The second online conductivity meter is interlocked with the second solenoid valve, and the third solenoid valve and the fourth solenoid valve are respectively provided on the outlet pipes at the bottom of the first collecting and distributing water tank and the second collecting and distributing water tank, and are connected to the inlet of the first precision filter through the third solenoid valve and the fourth solenoid valve respectively through the outlet pipes. The first collecting and distributing water tank and the second collecting and distributing water tank are respectively provided with a first liquid level gauge and a second liquid level gauge, the first liquid level gauge is interlocked with the third solenoid valve, and the second liquid level gauge is interlocked with the fourth solenoid valve, an outlet of the first precision filter is provided with a water outlet collecting pipe, and a water supply pump is provided on the water outlet collecting pipe, which is connected to the production water unit through the water supply pump.

2. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 1 is characterized in that: The concentrated water recovery pipes of the first collecting and distributing water tank and the second collecting and distributing water tank are respectively provided with a first throttle valve and a second throttle valve, and the first throttle valve and the second throttle valve are not opened at the same time.

3. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 2 is characterized in that: The operating condition for the first throttle valve to switch from an open position to a closed position is set as follows: the liquid level of the concentrated water in the first collection and distribution water tank reaches 4.3m; The action condition for the second throttle valve to switch from an open position to a closed position is set as: the liquid level of the concentrated water in the second collection and distribution water tank reaches 4.3m.

4. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 1 is characterized in that: The conductivity thresholds of the first online conductivity meter and the second online conductivity meter are both set to 600 us / cm; The action condition for the first solenoid valve to switch from an open position to a closed position is set as: the conductivity of the concentrated water in the first collection and distribution water tank is less than the conductivity threshold; The action condition for the second solenoid valve to switch from an open position to a closed position is set as: the conductivity of the concentrated water in the second collection and adjustment water tank is less than the conductivity threshold.

5. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 1 is characterized in that: The liquid level thresholds of the first liquid level gauge and the second liquid level gauge are both set to 0.6m; The action condition for the third solenoid valve to switch from the open position to the closed position is set as: the liquid level of the concentrated water in the first collection and distribution water tank is less than the liquid level threshold; The operating condition for the fourth solenoid valve to switch from the open position to the closed position is set as: the liquid level of the concentrated water in the second collection and distribution water tank is less than the liquid level threshold; The third solenoid valve and the fourth solenoid valve are not opened at the same time.

6. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 1 is characterized in that: The filtering accuracy of the first precision filter is 30-50um, and the operating pressure is 0.1-0.6Mpa. A fifth solenoid valve is provided at the inlet of the first precision filter.

7. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 6 is characterized in that: The pressure difference threshold of the inlet and outlet of the first precision filter is set to 0.05-0.07 MPa; The opening condition of the fifth solenoid valve is set as: the inlet and outlet pressure difference of the first precision filter is within the pressure difference threshold.

8. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 1 is characterized in that: The water outlet manifold is also provided with a pressure gauge, which is interlocked with the water supply pump and has a pressure threshold set at 0.35-0.4 MPa. The condition for reducing the working power of the water supply pump is set as: the pressure value of the pressure gauge is higher than the pressure threshold; The condition for increasing the working power of the water supply pump is set as: the pressure value of the pressure gauge is lower than the pressure threshold.

9. The concentrated water automatic recycling system for a pure water preparation workshop according to any one of claims 1 to 8, characterized in that: The first collecting and distributing water tank and the second collecting and distributing water tank are both provided with an overflow communication port and an external overflow port at the top, and an emptying port at the bottom.

10. The concentrated water automatic recycling system for a pure water preparation workshop according to claim 9, characterized in that: The liquid level heights of the overflow communication port, external overflow port, and emptying port are 4.6m, 4.8m, and 0.2m respectively.

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