Constant pressure water supply system for concentrated water recycling

Abstract

The utility model provides a kind of constant pressure water supply system of concentrated water recycling, it is related to water resource recycling technical field, including wastewater collection unit, constant pressure water supply unit.Wastewater collection unit includes water storage tank, wastewater collection pipeline, liquid level meter, overflow bypass pipeline and water replenishing mechanism;Constant pressure water supply unit includes water pump, water supply pipeline, pressure sensor, water-using equipment and controller;The utility model has realized the efficient recycling of wastewater generated in the process of pure water preparation, effectively solved the resource waste problem caused by the direct discharge of wastewater of traditional pure water system, saved cost;Overflow bypass pipeline and water replenishing mechanism are set, the situation that wastewater generation and usage do not match is solved, the stable operation of system and the reliability of water supply are ensured.

Description

Technical Field

[0001] This utility model relates to the field of water resource recycling technology, specifically to a constant pressure water supply system for the reuse of concentrated water. Background Technology

[0002] Pure water systems are widely used in industries such as pharmaceuticals, electronics, and food, and are an important component of the production process. In the pure water production process, technologies such as reverse osmosis are typically used to treat tap water into pure water. However, this process inevitably generates a large amount of concentrated wastewater. Taking pharmaceutical companies as an example, producing one ton of pure water usually requires 1.3 tons of tap water, of which approximately 0.3 tons are converted into concentrated wastewater. Industrial production requires the production of large quantities of pure water, which in turn generates a significant amount of concentrated wastewater that needs treatment. Furthermore, pure water systems require regular backwashing, which also generates substantial amounts of wastewater. This wastewater is usually directly discharged into sewage systems, not only wasting water resources but also increasing the company's wastewater treatment costs.

[0003] Meanwhile, in many businesses and offices, unstable tap water pressure often leads to incomplete toilet flushing, affecting user experience and environmental hygiene. This water pressure issue is particularly pronounced in the upper floors of multi-story buildings.

[0004] Currently, some companies have begun exploring the recycling and reuse of wastewater from pure water systems, such as using concentrated wastewater for landscaping and cleaning. However, most existing wastewater recycling systems employ simple collection and diversion methods, lacking effective pressure control mechanisms and failing to guarantee stable water supply pressure. In scenarios requiring high water pressure, such as toilet flushing, existing systems are ill-suited to meet the demands. Furthermore, existing systems typically rely on the concentrated wastewater's own drainage pressure (approximately 0.2 MPa) for passive diversion, neglecting the mismatch between concentrated wastewater production and usage. When concentrated wastewater production is insufficient, normal operation cannot be guaranteed; conversely, when concentrated wastewater production is excessive, the excess wastewater cannot be effectively treated.

[0005] On the other hand, traditional water supply systems often use manual start-stop pumps to regulate water pressure, which not only wastes human resources but also easily leads to unstable water pressure. Even water supply systems that use automatically controlled pumps often operate at full capacity, resulting in waste of electricity and water resources when water consumption is low, while insufficient pressure may occur when water consumption is high.

[0006] Chinese patent CN201151680Y discloses a workshop concentrated water treatment system, which uses a three-way pipe to collect concentrated water generated in industrial production. This solves the problem of concentrated water recycling and reuse, saving resources and wastewater treatment costs. However, it does not solve the problem of the mismatch between the amount of concentrated water generated and the amount used.

[0007] Chinese patent CN218175995U discloses a constant pressure water supply control system, which adopts the technical solution of PLC automatic controller system and achieves the technical effect of automatic constant pressure water supply. However, it does not solve the problem of how to ensure constant pressure when there is insufficient or excessive concentrated water.

[0008] Therefore, there is an urgent need for a technical solution that can effectively recycle and reuse the wastewater generated during the pure water preparation process, while solving the problem of unstable water pressure in toilet flushing, so as to realize the recycling of water resources, reduce enterprise operating costs, and improve the user experience. Utility Model Content

[0009] The purpose of this invention is to provide a constant pressure water supply system for the reuse of concentrated water, which solves the problems of efficient recycling of concentrated water and wastewater, and how to ensure constant pressure when there is insufficient or excessive wastewater.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a constant pressure water supply system for concentrated water reuse, comprising a wastewater collection unit and a constant pressure water supply unit connected in sequence. The wastewater collection unit includes a water storage tank, a wastewater collection pipeline, a level gauge, an overflow bypass pipeline, and a water replenishment mechanism. The constant pressure water supply unit includes a water pump, a water supply pipeline, a pressure sensor, water-using equipment, and a controller.

[0011] The first end of the wastewater collection pipe is connected to the pure water preparation system, and the second end is connected to the water storage tank; the first end of the overflow bypass pipe is connected to the water storage tank, and the second end is connected to the sewage pipe; the water replenishment mechanism is connected to the water storage tank, the level gauge is installed inside the water storage tank, and the water replenishment mechanism is electrically connected to the level gauge;

[0012] The first end of the water pump is connected to the water storage tank, and the second end is connected to the water supply pipeline. The pressure sensor is installed on the water supply pipeline, and the other end of the water supply pipeline is connected to a water-using device. The controller is electrically connected to the pressure sensor and the water pump respectively.

[0013] Furthermore: the water replenishment mechanism includes a water replenishment pipeline and a solenoid valve; the first end of the water replenishment pipeline is connected to a tap water pipe, the second end is connected to a water storage tank, the solenoid valve is installed on the water replenishment pipeline, and the solenoid valve is electrically connected to a level gauge.

[0014] Furthermore, the level gauge also includes a water replenishment stop sensor, a water replenishment start sensor, and a low level alarm sensor, which are sequentially arranged on the level gauge.

[0015] Furthermore, the water supply pipeline is also equipped with an observation port and a vent.

[0016] Furthermore, the water pump is a dual-pump set, including a first water pump and a second water pump connected in parallel.

[0017] Furthermore, both the first and second water pumps are variable frequency speed control pumps.

[0018] Furthermore, the pressure sensor includes a pressure gauge and a pressure stabilizing tank connected in sequence.

[0019] Furthermore, the water storage tank is made of fiberglass.

[0020] Furthermore, the controller is a PLC controller.

[0021] Furthermore, the wastewater collection pipe is a PPR pipe or a PVC pipe.

[0022] Furthermore, the constant pressure water supply unit also includes a front pressure gauge and a rear pressure gauge. The front pressure gauge is located between the water storage tank and the water pump, and the rear pressure gauge is located on the water supply pipeline.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] I. This utility model achieves efficient recycling of wastewater generated during the pure water preparation process, effectively solving the resource waste problem caused by the direct discharge of wastewater from traditional pure water systems and saving costs. It incorporates an overflow bypass pipeline and a water replenishment mechanism to address the mismatch between wastewater generation and usage. When wastewater generation exceeds usage, excess wastewater is automatically discharged through the overflow bypass pipeline; when wastewater generation is less than usage, the system automatically replenishes tap water through the water replenishment mechanism, ensuring stable system operation and reliable water supply.

[0025] Second, this utility model effectively solves the problem of unstable water pressure for toilet flushing. It adopts a closed-loop control principle, monitors the water pressure in the pipeline in real time through a pressure sensor, and automatically adjusts the operating frequency and speed of the water pump by the PLC controller to maintain the water pressure of the water supply system at around 3.0 Bar, thus ensuring the stability and reliability of the toilet flushing effect.

[0026] Third, this utility model adopts a dual-pump frequency conversion collaborative control strategy, which automatically switches between single-pump or dual-pump operation modes according to actual water demand and water pressure. While meeting water supply needs, it achieves efficient energy utilization and reduces operating costs. At the same time, the system has multiple safety protection measures, including empty pipe protection, overload protection and abnormal pressure protection, to ensure that the equipment can automatically stop and alarm in abnormal situations, thereby improving the safety and reliability of the system.

[0027] Fourth, this utility model is specifically designed for the characteristics of wastewater produced from pure water. It uses a fiberglass water storage tank and PPR or PVC special pipes, which have anti-corrosion and acid and alkali resistance properties, extending the service life of the system and reducing maintenance costs. Attached Figure Description

[0028] Figure 1 A schematic diagram of a constant pressure water supply system for concentrate reuse provided by this utility model;

[0029] Figure 2 A schematic diagram of the structure of the water replenishment mechanism connected to the water storage tank in a constant pressure water supply system for concentrated water reuse provided by this utility model.

[0030] In the picture:

[0031] 1. Water storage tank; 2. Level gauge; 3. Water replenishment mechanism; 4. Water pump; 5. Water supply pipeline; 6. Pressure gauge; 7. Pressure stabilizing tank; 8. Water-using equipment; 9. Controller; 11. Observation port; 12. Vent; 13. Tap water inlet; 14. Concentrate inlet; 15. Solenoid valve; 16. Water replenishment pipeline; 17. Overflow bypass pipeline; 18. Water outlet; 21. Water replenishment stop sensor; 22. Water replenishment start sensor; 23. Low liquid level alarm sensor. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] like Figure 1As shown: This utility model provides a constant pressure water supply system for concentrated water reuse, including a wastewater collection unit and a constant pressure water supply unit connected in sequence. The wastewater collection unit includes a water storage tank 1, a wastewater collection pipe, a level gauge 2, an overflow bypass pipe 17, and a water replenishment mechanism 3; the constant pressure water supply unit includes a water pump 4, a water supply pipe 5, a pressure sensor 6, a pressure stabilizing tank 7, water-using equipment 8, and a controller 9.

[0035] The first end of the wastewater collection pipe is connected to the pure water preparation system, and the second end is connected to the storage tank 1. The wastewater collection pipe and the storage tank 1 are corrosion-resistant and acid and alkali resistant. The storage tank 1 is made of fiberglass, which can adapt to the characteristics of concentrated water. The wastewater collection pipe is a PPR pipe or a PVC pipe, which is used to collect the concentrated water generated during the pure water preparation process. The first end of the overflow bypass pipe 17 is connected to the storage tank 1, and the second end is connected to the sewage pipe. When the amount of wastewater in the storage tank 1 exceeds the preset high liquid level, the excess wastewater will be automatically discharged into the sewage pipe through the overflow bypass pipe 17. The water replenishment mechanism 3 is connected to the storage tank 1. The level gauge 2 is installed inside the storage tank 1 to monitor the water level in the storage tank 1.

[0036] The water pump 4 is connected at one end to the water storage tank 1 and at the other end to the water supply pipeline 5. A pressure sensor is installed on the water supply pipeline 5, which includes a pressure gauge 6 and a pressure stabilizing tank 7 connected in sequence. The pressure stabilizing tank 7 buffers water pressure fluctuations, further improving the stability of the water supply pressure. A water-using device 8 is connected to the end of the water supply pipeline 5. A controller 9 is electrically connected to both the pressure sensor and the water pump 4. The controller 9 is a PLC controller, which is also electrically connected to both the pressure sensor and the water pump 4. Based on the water pressure signal fed back by the pressure sensor, it automatically adjusts the operating frequency and speed of the water pump 4 to maintain the water pressure in the water supply pipeline 5 within a preset range. This system adopts a closed-loop control principle, with a target water pressure set at 3.0 Bar and an allowable fluctuation range of 2.8-3.5 Bar. By precisely adjusting the operating state of the water pump 4, the stability of the water pressure is ensured, thereby solving the problem of unstable water pressure for toilet flushing.

[0037] The PLC controller also features multiple safety protection functions, such as an empty pipe protection function. If no pressure is detected in the inlet pipe within 30 seconds after water pump 4 starts, the system will automatically issue an empty pipe alarm signal and stop water pump 4 to prevent damage from dry running. In addition, the control system also has an overload protection function, which will immediately protect the system when the load exceeds 130% for one minute or 180%.

[0038] Pump 4 is a dual-pump unit used to extract and pressurize wastewater from storage tank 1 and deliver it to water-using equipment 8. To improve the stability and reliability of the system's water supply, pump 4 of the constant pressure water supply unit adopts a dual-pump design, including a first pump and a second pump connected in parallel, both of which are variable frequency speed control pumps. Depending on water demand and water pressure, the system can control the first pump to work alone, the second pump to work alone, or both pumps to work simultaneously, ensuring both water supply stability and efficient energy utilization.

[0039] According to a specific embodiment of this utility model, such as Figure 2 As shown, the top of the water storage tank 1 is equipped with a level gauge 2, an observation port 11, a vent 12, a tap water inlet 13, and a concentrated water inlet 14. The upper part of one side of the water storage tank 1 is equipped with an overflow bypass pipe 17 connected to the sewage pipe, and the lower part of one side of the water storage tank 1 is equipped with an outlet 18 connected to the water supply pump inlet. The level gauge 2 also includes a water replenishment stop sensor 21, a water replenishment start sensor 22, and a low level alarm sensor 23 arranged in sequence. The observation port 11 is used to facilitate the observation of the internal condition of the water storage tank 1 by the staff. The vent 12 is used to maintain air exchange between the inside of the water storage tank 1 and the outside environment to prevent excessive pressure inside the water storage tank 1. The tap water inlet 13 is connected to the water replenishment mechanism, which includes a water replenishment pipe 16 and a solenoid valve 15. The solenoid valve 15 is used to control the start and stop of water replenishment by the water replenishment mechanism. The solenoid valve 15 is electrically connected to the level gauge 2. The concentrated water inlet 14 is connected to the concentrated water drain pipe of the pure water equipment.

[0040] According to a specific embodiment of this utility model, the water replenishment mechanism 3 includes a water replenishment pipe 16 and a solenoid valve 15. The first end of the water replenishment pipe 16 is connected to a tap water pipe, and the second end is connected to a water storage tank 1. The solenoid valve 15 is installed on the water replenishment pipe 16 and is electrically connected to a level gauge 2. When the water replenishment start sensor 22 in the level gauge 2 detects that the water level in the water storage tank 1 is lower than the preset low water replenishment level, the solenoid valve 15 opens to automatically replenish tap water into the water storage tank 1. When the water replenishment stop sensor 21 in the level gauge 2 detects that the water level in the water storage tank 1 is higher than the preset high water replenishment level, the solenoid valve 15 closes to stop replenishing tap water into the water storage tank 1. When the low water level alarm sensor 23 in the level gauge 2 detects that the water level in the water storage tank 1 is lower than the preset low alarm level, an alarm signal is issued to remind the staff to handle the situation and ensure the normal operation of the system. An observation port 11 is also provided on the water storage tank to facilitate the staff to observe the tap water replenishment situation.

[0041] According to a specific embodiment of this utility model, the constant pressure water supply unit also includes a front pressure gauge and a rear pressure gauge. The front pressure gauge is set between the water storage tank 1 and the water pump 4, and the rear pressure gauge is set on the water supply pipeline 5 to display the pressure values ​​before and after the pump, so as to facilitate the staff to monitor the system operation status.

[0042] The working principle of this utility model is as follows:

[0043] In operation, the constant pressure water supply system for concentrated water reuse of this invention first collects the concentrated wastewater generated during the pure water preparation process through a wastewater collection unit. Specifically, the concentrated water and backwash wastewater generated during the pure water preparation process flow by gravity into a fiberglass storage tank 1 through a dedicated PPR or PVC pipe. A level gauge 2 on the storage tank 1 monitors the water level in real time.

[0044] When the water level in storage tank 1 rises to the preset high level, the system will activate the overflow protection function. Wastewater in storage tank 1 will automatically overflow into the sewage pipe through the overflow bypass pipe 17, preventing storage tank 1 from overflowing. Conversely, when the water replenishment start sensor 22 in level gauge 2 detects that the water level in storage tank 1 is lower than the preset low water replenishment level, the solenoid valve 15 opens, automatically replenishing tap water into storage tank 1; when the water replenishment stop sensor 21 in level gauge 2 detects that the water level in storage tank 1 is higher than the preset high water replenishment level, the solenoid valve 15 closes, stopping the replenishment of tap water into storage tank 1; when the low water level alarm sensor 23 in level gauge 2 detects that the water level in storage tank 1 is lower than the preset low alarm level, an alarm signal is issued to remind personnel to handle the situation. The water replenishment process can be manually observed through the observation port 11 on storage tank 1 to ensure that the water replenishment is proceeding normally. Through this automatic water level management mechanism, the system can effectively cope with situations where wastewater generation and usage are mismatched, ensuring the continuous and stable operation of the system.

[0045] When water demand arises, the constant pressure water supply unit starts working. A pressure sensor on the water supply pipeline 5 monitors the pipeline water pressure in real time and transmits the pressure signal to the PLC controller. When the detected pipeline pressure is lower than the preset lower limit of 2.8 Bar, the PLC controller controls the water pump 4 to start supplying water; when the pipeline pressure is higher than the preset upper limit of 3.5 Bar, the controller 9 controls the water pump 4 to stop supplying water or reduce its operating frequency, entering a sleep-life energy-saving mode. The entire process adopts a closed-loop control principle, adjusting the operating frequency and speed of the water pump 4 in real time to maintain the water supply system at the target water pressure of approximately 3.0 Bar, with fluctuations controlled between 2.8 and 3.5 Bar, thus solving the problem of unstable toilet flushing water pressure.

[0046] For a dual-pump system, the PLC controller intelligently controls the operating status of pump 4 based on actual water consumption and pressure requirements. When water consumption is low, the controller 9 controls the first pump to operate alone; when water consumption increases but remains within the single pump's load range, the controller can switch to the second pump to operate alone, balancing the usage time of the two pumps; when water consumption is so high that a single pump cannot meet the demand, the controller 9 will simultaneously start both pumps to work together. This intelligent allocation strategy ensures water supply while achieving efficient energy utilization and reducing operating costs.

[0047] To ensure safe system operation, this invention incorporates multiple safety protection mechanisms. If no pressure is detected in the inlet pipe within 30 seconds of pump 4 starting, the system automatically determines it to be in an empty pipe state, immediately issues an empty pipe alarm signal, and stops pump 4 to prevent damage from dry running. Furthermore, the system has overload protection; if the load exceeds 130% for one minute or momentarily exceeds 180%, the system immediately activates protection measures and cuts off the power supply. The pressure stabilizing tank 7, located on the outlet side of pump 4, buffers water pressure fluctuations, further improving the stability of the water supply pressure and extending the service life of pump 4. Pressure gauges on the water supply pipeline 5 visually display the pressure values ​​before and after the pump, facilitating monitoring of the system's operating status by staff.

[0048] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A constant pressure water supply system for concentrated water reuse, comprising a wastewater collecting unit and a constant pressure water supply unit connected in sequence, characterized in that: The wastewater collection unit includes a water storage tank, wastewater collection pipes, a level gauge, an overflow bypass pipe, and a water replenishment mechanism; the constant pressure water supply unit includes a water pump, a water supply pipe, a pressure sensor, water-using equipment, and a controller. The first end of the wastewater collection pipe is connected to the pure water preparation system, and the second end is connected to the water storage tank; the first end of the overflow bypass pipe is connected to the water storage tank, and the second end is connected to the sewage pipe; the water replenishment mechanism is connected to the water storage tank, the level gauge is installed inside the water storage tank, and the water replenishment mechanism is electrically connected to the level gauge; The first end of the water pump is connected to the water storage tank, and the second end is connected to the water supply pipeline. The pressure sensor is installed on the water supply pipeline, and the other end of the water supply pipeline is connected to a water-using device. The controller is electrically connected to the pressure sensor and the water pump respectively.

2. The constant pressure water supply system for concentrated water reuse according to claim 1, characterized in that: The water replenishment mechanism includes a water replenishment pipeline and a solenoid valve; the first end of the water replenishment pipeline is connected to a tap water pipe, and the second end is connected to a water storage tank; the solenoid valve is installed on the water replenishment pipeline and is electrically connected to a level gauge.

3. The constant pressure water supply system for reusing concentrated water according to claim 1, characterized in that: The level gauge also includes a water replenishment stop sensor, a water replenishment start sensor, and a low level alarm sensor, which are respectively installed on the level gauge.

4. The constant pressure water supply system for reusing concentrated water according to claim 1, wherein: The water storage tank is also equipped with an observation port and a vent.

5. The constant pressure water supply system for reusing concentrated water according to claim 1, wherein: The water pump is a dual-pump set, including a first water pump and a second water pump connected in parallel.

6. The constant pressure water supply system of claim 5, wherein: Both the first and second water pumps are variable frequency speed control pumps.

7. The constant pressure water supply system of claim 1, wherein: The pressure sensor includes a pressure gauge and a pressure stabilizing tank connected in sequence.

8. The constant pressure water supply system of claim 1, wherein: The water storage tank is made of fiberglass.

9. The constant pressure water supply system of claim 1, wherein: The controller is a PLC controller.

10. A constant pressure water supply system for concentrate reuse according to claim 1, characterized in that: The wastewater collection pipe is a PPR pipe or a PVC pipe.

11. The constant pressure water supply system for reusing concentrated water according to claim 1, wherein: The constant pressure water supply unit also includes a front pressure gauge and a rear pressure gauge. The front pressure gauge is located between the water storage tank and the water pump, and the rear pressure gauge is located on the water supply pipeline.

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