Ultrapure water production system for stabilizing water quality

Abstract

The utility model belongs to the technical field of ultrapure water production equipment, and provides an ultrapure water production system for stabilizing water quality, which comprises a multi-stage filter unit, a balancer, a reverse osmosis unit, an ultrapure water tank and an ultrapure water delivery pump which are sequentially arranged along the water purification direction, the ultrapure water tank and the ultrapure water delivery pump are connected through a pipeline to form a first water circulation loop, and the balancer and the ultrapure water delivery pump are connected through a pipeline to form a second water circulation loop; the system further comprises a water quality monitor and a PLC, the water quality monitor is arranged at the water outlet end of the ultrapure water conveying pump, the PLC is electrically connected with the water quality monitor, and the PLC is used for controlling opening and closing of the first water circulation loop and the second water circulation loop. The ultrapure water production device is simple in structure, easy to implement and high in automation degree, the water quality stability and purity of ultrapure water stored for a long time can be improved, and the produced ultrapure water is suitable for medical inspection.

Description

Technical Field

[0001] The present application relates to the technical field of ultrapure water production equipment, and in particular to an ultrapure water production system for stabilizing water quality. Background Art

[0002] When hospitals conduct biochemical tests and other chemical tests, they need to use ultrapure water, but the water used by the hospital laboratory is intermittent. The ultrapure water produced by the medical ultrapure water machine will change its water quality if it is not used for a long time after production. For example, the purity of ultrapure water will gradually decrease over time. For medical tests, the ultrapure water is not pure enough, which affects the consistency and accuracy of the test data to a certain extent. Therefore, it is necessary to ensure that the ultrapure water produced by the medical ultrapure water machine has stable water quality and maintains its high purity during long-term storage.

[0003] At present, there are three common methods for ensuring the stability of ultrapure water storage quality:

[0004] (1) Nitrogen filling method: nitrogen is filled on the water surface of the water tank to maintain an appropriate positive pressure in the water tank, preventing the atmosphere from contacting the water surface in the water tank, isolating the air, and achieving good water quality stability. However, in actual use, many ultrapure water users are unable to provide nitrogen, so it is difficult to ensure water quality.

[0005] (2) Film bag method: a bag-shaped film is placed inside the water tank to cover the water surface. The film bag rises and falls with the water level, reducing the contact area between the water surface and the air. Due to the sealing problem between the film bag and the four walls of the water tank, the water quality stabilization effect is poor.

[0006] (3) Floating roof method: A whole plate-shaped floating roof is made in the water tank with a light material lighter than water, and floats on the water surface. The gap between the floating roof and the water tank is covered with a light elastic material (such as sponge, foam plastic, etc.). The floating roof rises and falls with the water surface, thereby reducing the contact between air and water. However, due to the sealing problem between the floating roof material and the four walls of the water tank, the water quality stabilization effect is poor.

[0007] Therefore, a more stable and convenient ultrapure water production device is needed, which can ensure that the ultrapure water has good water quality stability under long-term storage. In response to the above needs, the prior art continues to improve ultrapure production devices. For example, the patent with publication number CN215440015U discloses a full-membrane medical central pure water system, which includes a self-cleaning filter, an ultrafiltration device, a primary reverse osmosis device, a secondary reverse osmosis device, a pure water tank, an EDI device, an ultrapure water tank, a UV sterilizer and a microporous filter connected in sequence. It adds a return water detection instrument to the system ultrapure water pump, self-corrects the discharge of unqualified water, and prepares fresh water. Although it can ensure the stability of the water quality of the produced water, the water utilization rate is low, and the unqualified water is not subjected to reverse osmosis treatment for secondary use.

[0008] In summary, if an ultrapure water production system can be provided to improve the water quality stability of ultrapure water after storage, ensure the water purity of ultrapure water, and improve water utilization, it will be more conducive to the development of medical ultrapure water equipment. Utility Model Content

[0009] In view of the above-mentioned shortcomings of the prior art, the utility model provides an ultrapure water production system for stabilizing water quality, so as to solve the problems existing in the prior art of poor water quality stability and reduced purity of ultrapure water after long-term storage in existing medical ultrapure water machines.

[0010] In order to achieve the above-mentioned and related purposes, the utility model adopts the following technical solutions:

[0011] An ultrapure water production system for stabilizing water quality comprises a multi-stage filtration unit, a balancer, a reverse osmosis unit, an ultrapure water tank and an ultrapure water delivery pump which are sequentially arranged along a water purification direction, wherein the ultrapure water tank and the ultrapure water delivery pump are connected via a pipeline to form a first water circulation loop, and the balancer and the ultrapure water delivery pump are connected via a pipeline to form a second water circulation loop; the system also comprises a water quality monitor and a PLC controller, wherein the water quality monitor is arranged at a water outlet end of the ultrapure water delivery pump, the PLC controller is electrically connected to the water quality monitor, and the PLC controller is used to control the opening and closing of the first water circulation loop and the second water circulation loop.

[0012] In one embodiment of the present application, a first automatic valve is provided on the first water circulation loop, a second automatic valve is provided on the second water circulation loop, and a PLC controller is electrically connected to the first automatic valve and the second automatic valve, respectively.

[0013] In one embodiment of the present application, a pipe at the water outlet of the ultrapure water delivery pump is connected to multiple water use points.

[0014] In one embodiment of the present application, a check valve is provided at the water inlet of each water use point.

[0015] In one embodiment of the present application, the PLC controller is electrically connected to the check valve to control the opening and closing of the check valve.

[0016] In one embodiment of the present application, the ultrapure water delivery pump is a variable frequency circulation delivery pump.

[0017] In one embodiment of the present application, the multi-stage filtration unit includes a mechanical filter, an activated carbon filter, a softening filter and a precision filter which are sequentially connected in pipelines along the water purification process.

[0018] In one embodiment of the present application, the reverse osmosis unit includes a primary high-pressure pump, a primary reverse osmosis membrane, a secondary high-pressure pump and a secondary reverse osmosis membrane which are sequentially connected by pipelines along the water purification process.

[0019] In one embodiment of the present application, the system further includes an EDI device, which is disposed between the reverse osmosis unit and the ultrapure water tank.

[0020] In one embodiment of the present application, the system further includes a raw water inlet pipe, which is connected to the water inlet of the multi-stage filtration unit.

[0021] The beneficial technical effects of the utility model are:

[0022] The utility model arranges a water quality monitor at the water outlet of the ultrapure water delivery pump to monitor the purity of the water delivered to each water use point in real time. When it is monitored that the purity of the water changes and is lower than the medical use standard, the first water circulation loop can be controlled to open through the PLC controller, so that the water stored in the ultrapure water tank flows back to the balancer, so as to be purified again through the reverse osmosis unit and the EDI device, so that the purity of the water reaches the medical use standard.

[0023] If it is monitored that the water purity meets the medical use standards, the produced ultrapure water will be transported to various water use points, and the unused water will be returned to the ultrapure water tank for storage through the second circulation loop.

[0024] The utility model can monitor the water quality of the pure water stored in the ultrapure water tank in real time, and select different water return modes through a PLC controller to ensure the water purity of the ultrapure water delivered to the water use point.

[0025] The utility model has a simple structure, is easy to implement, has a high degree of automation, can improve the water quality stability and purity of ultrapure water stored for a long time, and the produced ultrapure water is suitable for medical examination.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 It is a structural schematic diagram of the ultrapure water production system of the utility model.

[0029] Reference numerals

[0030] 1: Mechanical filter; 2: Activated carbon filter; 3: Softening filter; 4: Precision filter; 5: Balancer; 6: First-stage high-pressure pump; 7: First-stage reverse osmosis; 8: Second-stage high-pressure pump; 9: Second-stage reverse osmosis; 10: EDI device; 11: Ultrapure water tank; 12: Ultrapure water delivery pump; 13: Water quality monitor; 14: Water use point; 15: Check valve; 16: PLC controller; 17: Second automatic valve; 18: First automatic valve. DETAILED DESCRIPTION

[0031] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0033] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "front", "rear", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the figure, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The utility model provides an ultrapure water production system for stabilizing water quality, comprising a multi-stage filtering unit, a balancer 5, a reverse osmosis unit, an ultrapure water tank 11 and an ultrapure water delivery pump 12 which are sequentially arranged along a water purification direction, wherein the ultrapure water tank 11 and the ultrapure water delivery pump 12 are connected via a pipeline to form a first water circulation loop, and the balancer 5 and the ultrapure water delivery pump 12 are connected via a pipeline to form a second water circulation loop; the utility model also comprises a water quality monitor 13 and a PLC controller 16, wherein the water quality monitor 13 is arranged at the water outlet end of the ultrapure water delivery pump 12, the PLC controller 16 is electrically connected to the water quality monitor 13, and the PLC controller 16 is used to control the opening and closing of the first water circulation loop and the second water circulation loop.

[0035] In some embodiments, Figure 1 As shown, the system further includes an EDI device 10 , which is disposed between the reverse osmosis unit and the ultrapure water tank 11 .

[0036] In some embodiments, Figure 1 As shown, the multi-stage filtration unit includes a mechanical filter 1, an activated carbon filter 2, a softening filter 3 and a precision filter 4 which are sequentially connected in pipelines along the water purification process.

[0037] In some embodiments, the system further includes a raw water inlet pipe, which is connected to the water inlet of the mechanical filter 1 and is used to provide raw water, which can be an unpurified water source such as tap water.

[0038] In some embodiments, the balancer 5 is a normal pressure container that is equalized with the atmospheric pressure. On the one hand, the balancer 5 of the present application is used to temporarily store water pre-treated by the multi-stage filtration unit, providing a stable water source for the reverse osmosis unit, so that the water inlet of the reverse osmosis unit is not affected by the flow fluctuation of the front-end multi-stage filtration unit, thereby improving the quality of the water outlet and achieving a better osmosis effect; on the other hand, the balancer 5 of the present application is used as a pure water temporary storage container, and the water output by the ultrapure water delivery pump 12 is returned to the balancer 5 through the second water circulation loop to be purified again by the reverse osmosis unit and the EDI device 10, thereby further improving the purity of the final water outlet.

[0039] In some embodiments, the reverse osmosis unit includes a primary high-pressure pump 6, a primary reverse osmosis 7 membrane, a secondary high-pressure pump 8 and a secondary reverse osmosis 9 membrane connected in sequence along the water purification process.

[0040] In some embodiments, the reverse osmosis unit and EDI device 10 of the present application can continuously or repeatedly circulate the pure water in the balancer 5, thereby effectively ensuring that the water stored in the ultrapure water tank 11 can meet the water requirements for medical examinations when used.

[0041] In some embodiments, Figure 1As shown, the outlet pipe of the ultrapure water delivery pump 12 is connected to multiple water points 14, and a check valve 15 is provided at the water inlet of each water point 14. A PLC controller 16 is electrically connected to the check valve 15 to control the opening and closing of the check valve 15.

[0042] In some embodiments, the ultrapure water delivery pump 12 is a variable frequency circulation delivery pump, which can adjust the flow rate of the pump according to demand, has good water supply stability and low noise.

[0043] In some embodiments, a first automatic valve 18 is provided on the first water circulation loop, a second automatic valve 17 is provided on the second water circulation loop, and the PLC controller 16 is electrically connected to the first automatic valve 18 and the second automatic valve 17 respectively.

[0044] In some embodiments, the water quality monitor 13 of the present application monitors the water quality of the pure water delivered to each water point 14 by the ultrapure water delivery pump 12 in real time. The water quality monitor 13 is selected from at least one of an ultrapure water conductivity meter, a multi-parameter water quality meter, a pH value monitor, a flow monitor, and an oxidation-reduction potential monitor.

[0045] In some embodiments, the working principle of the ultrapure water production system for stabilizing water quality of the present application is as follows:

[0046] The present application pre-sets the water quality target value through the PLC controller 16, and the water quality target value can be set based on the standard for medical examination water. When the production system is running, the raw water enters the mechanical filter 1 through the raw water inlet pipe, and is pre-treated in turn through the activated carbon filter 2, the softening filter 3, and the precision filter 4 to remove solid particles, suspended matter, colloids, odors, discoloration, organic pollutants, calcium and magnesium ions in the raw water to reduce the hardness of the raw water, tiny particles, oil stains and other impurities. The pre-treated preliminary pure water is temporarily stored in the balancer 5, and then enters the first reverse osmosis 7, the second reverse osmosis 9, and the EDI device 10 for re-purification to remove organic matter, bacteria, fungi, viruses, dissolved salts, cations, anions in the preliminary pure water, and reduce the conductivity of the water to obtain ultrapure water and store it in the ultrapure water tank 11.

[0047] When the water point 14 needs water, the ultrapure water delivery pump 12 delivers the ultrapure water in the ultrapure water tank 11 to the designated water point 14. At this time, the water quality monitor 13 monitors the water quality of the ultrapure water output by the ultrapure water delivery pump 12. When it is monitored that the water quality reaches the water quality target value, the PLC controller 16 sends a first signal. Based on the first signal, the PLC controller 16 controls the check valve 15 at the water inlet of the water point 14 to open, and the first automatic valve 18 and the second automatic valve 17 to close. The ultrapure water is then delivered along the pipeline to the designated water point 14 for medical examination.

[0048] In order to improve water utilization, when the water point 14 finishes using water, the PLC controller 16 controls the check valve 15 to close, the second automatic valve 17 to close, and the first automatic valve 18 to open, and the unused ultrapure water returns to the ultrapure water tank 11 along the first water circulation loop to continue to be stored for use.

[0049] When the water quality monitor 13 detects that the water quality does not reach the water quality target value, the PLC controller 16 controls the check valve 15 to close, the first automatic valve 18 to close, and the second automatic valve 17 to open, and the ultrapure water flows back to the balancer 5 along the second water circulation loop, and enters the reverse osmosis unit and the EDI device 10 after being buffered by the balancer 5, and is purified again. In this process, the water quality monitor 13 continuously monitors the water quality of the ultrapure water after repeated purification, and the reverse osmosis unit and the EDI device 10 continuously or repeatedly circulate the pure water in the balancer 5 until the ultrapure water in the ultrapure water tank 11 reaches the water quality target value, thereby ensuring the water purity of the ultrapure water delivered to the water point 14 and improving the water quality stability of the ultrapure water stored for a long time.

[0050] In some embodiments, if the distance between the water use points 14 is relatively far, the present application can set up multiple water quality monitors 13, which are respectively set on the water inlet pipes of each water use point 14 to monitor the ultrapure water quality in real time. If it is monitored that the water quality at any point does not meet the standard, the PLC controller 16 controls the return water process for re-purification.

[0051] In some embodiments, in order to simplify the pipeline design and reduce costs, the outlet pipeline of the ultrapure water delivery pump 12 of the present application can be provided with multiple water supply branches, which are respectively connected to the balancer 5, the ultrapure water tank 11 and each water use point 14 to form a first water circulation loop, a second water circulation loop and a water supply route of the water use point 14.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An ultrapure water production system for stabilizing water quality, characterized in that: It includes a multi-stage filtration unit, a balancer, a reverse osmosis unit, an ultrapure water tank and an ultrapure water delivery pump which are arranged in sequence along the water purification direction, the ultrapure water tank and the ultrapure water delivery pump are connected by a pipeline to form a first water circulation loop, and the balancer and the ultrapure water delivery pump are connected by a pipeline to form a second water circulation loop; it also includes a water quality monitor and a PLC controller, the water quality monitor is arranged at the water outlet end of the ultrapure water delivery pump, the PLC controller is electrically connected to the water quality monitor, and the PLC controller is used to control the opening and closing of the first water circulation loop and the second water circulation loop.

2. The ultrapure water production system for stabilizing water quality according to claim 1, characterized in that: The first water circulation loop is provided with a first automatic valve, the second water circulation loop is provided with a second automatic valve, and the PLC controller is electrically connected to the first automatic valve and the second automatic valve respectively.

3. The ultrapure water production system for stabilizing water quality according to claim 1, characterized in that: The water outlet pipe of the ultrapure water delivery pump is connected to multiple water use points.

4. The ultrapure water production system for stabilizing water quality according to claim 3, characterized in that: A check valve is arranged at the water inlet of each water use point.

5. The ultrapure water production system for stabilizing water quality according to claim 4, characterized in that: The PLC controller is electrically connected to the check valve and is used to control the opening and closing of the check valve.

6. The ultrapure water production system for stabilizing water quality according to claim 1, characterized in that: The ultrapure water delivery pump is a variable frequency circulation delivery pump.

7. The ultrapure water production system for stabilizing water quality according to claim 1, characterized in that: The multi-stage filtering unit comprises a mechanical filter, an activated carbon filter, a softening filter and a precision filter which are sequentially connected in pipelines along the water purification process.

8. The ultrapure water production system for stabilizing water quality according to claim 1, characterized in that: The reverse osmosis unit comprises a primary high-pressure pump, a primary reverse osmosis membrane, a secondary high-pressure pump and a secondary reverse osmosis membrane which are sequentially connected by pipelines along a water purification process.

9. The ultrapure water production system for stabilizing water quality according to claim 1, characterized in that: The system further includes an EDI device disposed between the reverse osmosis unit and the ultrapure water tank.

10. The ultrapure water production system for stabilizing water quality according to claim 1, characterized in that: The system further comprises a raw water inlet pipeline, wherein the raw water inlet pipeline is connected to the water inlet of the multi-stage filtering unit.

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