Concentrated water recycling system and method for industrial water purifier

Abstract

The invention relates to a system and a method for recycling concentrated water of an industrial water purifier. The recycling system comprises a recycling container, water outlet equipment, a first pipeline, a second pipeline, a liquid level measuring element, a pressure measuring element and a controller, the recovery container is used for storing concentrated water; the water inlet end of the water outlet equipment is communicated with the water outlet of the recovery container, and the water outlet end is communicated with one end of the first pipeline for outputting concentrated water in the recovery container; the other end of the first pipeline is a water outlet end; one end of the second pipeline is communicated with an external water supply system, the other end of the second pipeline is communicated with the water outlet end of the first pipeline, and the second pipeline is of a one-way conduction structure and is in a closed state when the water outlet equipment works; the liquid level measuring element is used for measuring the liquid level height of the recycling container; the pressure measuring element is used for measuring the outlet pressure of the water outlet equipment; the controller is electrically connected to the liquid level measuring element and the pressure measuring element. The concentrated water recycling device can recycle concentrated water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cigarette production equipment, and particularly relates to a concentrated water recycling system and method of an industrial water purifier. BACKGROUND

[0002] The concentrated water (electrical conductivity is less than or equal to 500 us / cm) accounting for 30%-50% of the raw water is generated in the water production process of the industrial water purifier, and it is difficult to utilize the concentrated water because of the unstable production of the concentrated water. The traditional treatment method is direct discharge, which causes waste of resources, and how to utilize the concentrated water becomes a problem to be solved. SUMMARY

[0003] The present application discloses a concentrated water recycling system and method of an industrial water purifier, and aims to solve the technical problems in the prior art.

[0004] The present application adopts the following technical scheme: The present application provides a concentrated water recycling system of an industrial water purifier, which comprises a recovery container, a water outlet device, a first pipeline, a second pipeline, a liquid level measuring element, a pressure measuring element and a controller; the recovery container is used for storing concentrated water; the water inlet end of the water outlet device is communicated with the water outlet of the recovery container, the water outlet end is communicated with one end of the first pipeline, and the water outlet device is used for externally conveying the concentrated water in the recovery container; the other end of the first pipeline is a water outlet end; one end of the second pipeline is used for communicating with an external water supply system, the other end is communicated with the water outlet end of the first pipeline, and the second pipeline is a one-way conduction structure and is in a closed state when the water outlet device works; the liquid level measuring element is used for measuring the liquid level height of the recovery container; the pressure measuring element is used for measuring the outlet pressure of the water outlet device; and the controller is electrically connected to the liquid level measuring element and the pressure measuring element, so as to control the start and stop of the water outlet device based on the measurement value of the liquid level measuring element, and control the outlet pressure of the water outlet device based on the measurement value of the pressure measuring element.

[0005] In the concentrated water recycling system of the industrial water purifier, the second pipeline comprises a second pipeline and a second one-way valve; one end of the second pipeline is used for communicating with an external water supply system, and the other end is communicated with the water outlet end of the first pipeline; the second one-way valve is arranged on the second pipeline and is used for one-way conduction from the external water supply system to the water outlet end of the first pipeline, and the opening pressure is less than or equal to P1-P2, wherein P1 is the required pressure of the water outlet end of the water outlet device, and P2 is the pressure of the external water supply system.

[0006] In the industrial pure water machine concentrated water recycling system, the first pipeline comprises a first pipeline and a first one-way valve; one end of the first pipeline is communicated with the water outlet end of the water outlet device, and the other end is a water outlet end; the first one-way valve is arranged on the first pipeline and is used for one-way communication of the water outlet end of the water outlet device to the water outlet end of the first pipeline, and the opening pressure ΔP2≤P1-P2, wherein P1 is the required pressure of the water outlet end of the water outlet device, and P2 is the pressure of the external water supply system.

[0007] In the industrial pure water machine concentrated water recycling system, the water outlet device comprises a delivery pump and a pressure stabilizing tank; the inlet of the delivery pump is communicated with the water outlet of the recycling container, and the outlet is communicated with one end of the first pipeline and the pressure stabilizing tank; the pressure stabilizing tank is used for stabilizing the outlet pressure of the delivery pump when the pump stops running.

[0008] In the industrial pure water machine concentrated water recycling system, the pressure stabilizing tank comprises a first tank body and a first elastic bag; the inlet of the first tank body is communicated with the outlet of the delivery pump; the first elastic bag is arranged in the first tank body and has an opening in sealed connection with the inlet of the first tank body, and the first elastic bag can adjust the outlet pressure of the delivery pump when the outlet pressure deviates from the required pressure.

[0009] In the industrial pure water machine concentrated water recycling system, a second tank body and a second elastic bag are further included; the second tank body is communicated with the space between the first tank body and the first elastic bag; the second elastic bag is arranged in the second tank body and is filled with pressure gas to adjust the outlet pressure of the delivery pump through compression or expansion of the pressure gas; the space between the second elastic bag and the second tank body and the space between the first tank body and the first elastic bag are filled with liquid.

[0010] In the industrial pure water machine concentrated water recycling system, the second tank body is provided with a gas filling port; the second elastic bag has an opening in sealed connection with the gas filling port and is communicated with an external pressure system to change the gas pressure in the second elastic bag.

[0011] In the industrial pure water machine concentrated water recycling system, the pressure stabilizing tank further comprises a third one-way valve and a self-powered pressure regulating valve; the third one-way valve is one-way communicated with the outlet of the delivery pump to the first elastic bag; the self-powered pressure regulating valve is communicated with the first elastic bag and the outlet of the delivery pump and is used for adjusting the outlet pressure of the delivery pump.

[0012] In the industrial pure water machine concentrated water recycling system, the delivery pump is a variable frequency pump.

[0013] In the second aspect, the application further provides a working method of the above-mentioned concentrated water recycling system, which comprises the following steps: When water is used, the second one-way valve of the second pipeline opens under the pressure difference between two sides, the first one-way valve of the first pipeline closes, and water is supplied by the external water supply system; The controller acquires the measurement value of the liquid level measuring element, If the measurement value of the liquid level measuring element is greater than zero, the controller controls the water outlet device to start; The controller acquires the measurement value of the pressure measuring element, and adjusts the rotating speed of the water outlet device according to the comparison between the measurement value of the pressure measuring element and the required pressure, so as to maintain the measurement value of the pressure measuring element at the required pressure; After the water outlet device works normally, the first one-way valve opens under the pressure difference between two sides, the second one-way valve closes under the pressure difference between two sides, the external water supply system stops supplying water, and the water supply is switched to the recovery container; If the measurement value of the liquid level measuring element is equal to zero, the controller controls the water outlet device to stop, and water is supplied by the external water supply system.

[0014] The technical scheme adopted by the present application can achieve the following beneficial effects: The present application mainly provides a concentrated water recycling system of an industrial water purifier, which recovers concentrated water by a recovery container, discharges water by a water outlet device, and connects an external water supply system by a second pipeline. Thus, continuous water supply can be ensured when water is used, and concentrated water is utilized to avoid waste. When the water outlet device supplies water, the second pipeline is automatically cut off to save clean water. The liquid level measuring element, the pressure measuring element and the controller are combined to automatically control the water outlet device, thereby improving the automation level. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows, which constitutes a part of the present application. The schematic embodiments of the present application and the description and explanation thereof do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is a structure schematic view of a concentrated water recycling system of an industrial water purifier of the present application; Figure 2 It is a structure schematic view of a pressure stabilizing tank of the present application; Figure 3 It is a structure schematic view of a pressure stabilizing tank of the present application.

[0016] Legend: 1. Recovery container; 2. Water outlet device; 21. Delivery pump; 22. Pressure stabilizing tank; 221. First tank body; 222. First elastic bag; 223. Second tank body; 224. Second elastic bag; 225. Fourth one-way valve; 226. Self-operated pressure regulating valve; 227. Water inlet pipe; 228. Water return pipe; 229. Fifth one-way valve; 3. First pipeline; 31. First pipe; 32. First one-way valve; 4. Second pipeline; 41. Second pipe; 42. Second one-way valve; 43. Second valve; 44. Flow measuring element; 5. Liquid level measuring element; 6. Pressure measuring element; 7. Controller; 8. Third valve. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described below in conjunction with specific embodiments of the present application and corresponding drawings. In the description of the present application, it should be noted that the term "or" is generally used in the sense of "and / or", unless the context clearly indicates otherwise.

[0018] Unless explicitly indicated to the contrary, numerical parameters in the description and the attached claims can be approximate values, which can be changed according to the desired characteristics obtained through the content of the present application. Specifically, all numbers used in the description and the claims to express the content of the composition, reaction conditions, and the like should be understood as being modified by the term "about" in all cases. Generally, the meaning expressed is that the range includes variations from the specified number by ±10% in some embodiments, by ±5% in some embodiments, by ±1% in some embodiments, by ±0.5% in some embodiments.

[0019] Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in the claims. The use of the ordinal numbers, such as "first", "second", "third", and Arabic numbers, letters, and the like, used in the description and the claims to modify the corresponding elements or steps, does not imply a sequential order in the manufacturing method, but is used only to make the steps clearly distinguishable.

[0020] In addition, the order of the steps described above is not limited to the order listed above, and can be changed or rearranged according to the desired design, unless the steps are specifically described or must occur in sequence. Also, the above-described embodiments can be mixed and used with each other or with other embodiments based on design and reliability considerations, i.e., the technical features in different embodiments can be freely combined to form more embodiments.

[0021] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] To address the problems existing in the prior art, this application provides an industrial pure water machine concentrate reuse system and method.

[0023] Example 1 This embodiment provides an industrial pure water machine concentrate reuse system, such as... Figure 1 As shown, it includes a recovery container 1, an outlet device 2, a first pipeline 3, a second pipeline 4, a liquid level measuring element 5, a pressure measuring element 6, and a controller 7. The recovery container 1 is used to store concentrated water. The inlet of the outlet device 2 is connected to the outlet of the recovery container 1, and the outlet is connected to one end of the first pipeline 3 for exporting the concentrated water in the recovery container 1. The other end of the first pipeline 3 is the outlet. One end of the second pipeline 4 is connected to an external water supply system, and the other end is connected to the outlet of the first pipeline 3. The second pipeline 4 has a unidirectional conduction structure and is closed when the outlet device 2 is working. The liquid level measuring element 5 is used to measure the liquid level height of the recovery container 1. The pressure measuring element 6 is used to measure the outlet pressure of the outlet device 2. The controller 7 is electrically connected to the liquid level measuring element 5 and the pressure measuring element 6 to control the start and stop of the outlet device 2 based on the measurement value of the liquid level measuring element 5, and to control the outlet pressure of the outlet device 2 based on the measurement value of the pressure measuring element 6.

[0024] This invention discloses an industrial pure water machine concentrate recycling system. It utilizes a recycling container 1 to collect concentrate and discharge it through an outlet device 2. A second pipeline 4 connects to an external water supply system, ensuring continuous water supply during use and utilizing the concentrate to avoid waste. Furthermore, by configuring the second pipeline 4 as a unidirectional flow structure, it automatically shuts off when water is supplied through the outlet device, saving clean water consumption. Finally, the system employs a level measuring element 5, a pressure measuring element 6, and a controller 7 to achieve automatic control of the outlet device 2, improving the level of automation.

[0025] In some preferred embodiments, a third valve 8 is also included, which is disposed at the outlet end of the first pipeline 3 and is used to control whether water is discharged from the first pipeline 3.

[0026] In some preferred embodiments, the recycling container 1 is provided with an overflow pipe.

[0027] In some preferred embodiments, the second pipeline 4 comprises a second pipeline 41 and a second one-way valve 42; one end of the second pipeline 4 is connected to the external water supply system, and the other end is connected to the water outlet end of the first pipeline 3; the second one-way valve 42 is arranged on the second pipeline 41 and is used for one-way conduction from the external water supply system to the water outlet end of the first pipeline 3; the second one-way valve 42 can be selected as a lifting type one-way valve, and the opening pressure ΔP1≥P1-P2, wherein P1 is the required pressure of the water outlet end of the water outlet device 2, and P2 is the pressure of the external water supply system; based on this, when the water outlet device 2 is not working, the second one-way valve 42 is opened under the pressure difference on both sides; when the pressure of the water outlet end of the water outlet device 2 rises to a pressure difference between P2 and P1 that is less than or equal to the opening pressure of the second one-way valve 42, the second one-way valve 42 is closed, cutting off the water supply from the external water supply system, and the concentrated water in the recovery container 1 is used for water supply.

[0028] Preferably, P1-P2≥0.15MPa, at this time, the closing pressure ΔP1≥P1-P2.

[0029] Preferably, a flow measurement element 44 is arranged on the second pipeline 41; when the flow measurement element 44 has a flow of zero, the water outlet end of the water outlet device 2 reaches the required pressure, avoiding changes in the opening and closing pressure of the second one-way valve 42 due to long-term use, and causing the concentrated water to flow back due to the second one-way valve 42 not being tightly closed. For example, P1 is the required pressure of the water outlet end of the water outlet device 2, which is 0.5MPa, and P2 is the pressure of the external water supply system, which is 0.35MPa. Further preferably, the closing pressure ΔP1=P1-P2; at this time, when the flow measurement element 44 has a flow of zero, the water outlet end of the water outlet device 2 reaches the required pressure, and it is not necessary to measure the pressure of the water outlet end of the water outlet device 2.

[0030] In some preferred embodiments, the second pipeline 4 further comprises a second valve 43, and the number of the second pipeline 4 is 2, which are arranged in parallel.

[0031] In some preferred embodiments, the first pipeline 3 comprises a first pipeline 31 and a first one-way valve 32; one end of the first pipeline 31 is connected to the water outlet end of the water outlet device 2, and the other end is the water outlet end; the first one-way valve 32 is arranged on the first pipeline 3 and is used for one-way conduction from the water outlet end of the water outlet device 2 to the water outlet end of the first pipeline 3; the first one-way valve 32 can be selected as a lifting type one-way valve, and the opening pressure ΔP2<P1-P2, wherein P1 is the required pressure of the water outlet end of the water outlet device 2, and P2 is the pressure of the external water supply system; based on this, it is possible to avoid the water of the external water supply system flowing into the first pipeline 31 and mixing with the concentrated water, causing waste of the external water.

[0032] Preferably, P1-P2<0.15MPa, at this time, the opening pressure ΔP2<P1-P2=0.15MPa.

[0033] Preferably, △P2 = P1 - P2; so that the first one-way valve 32 at the water outlet end of the water outlet device 2 can be opened when the required pressure is reached, and after the first one-way valve 32 is opened, the second one-way valve 42 is closed, realizing continuous water supply.

[0034] In some preferred embodiments, as shown in Figure 1 、 Figure 2 and Figure 3 , the water outlet device 2 comprises a delivery pump 21 and a pressure stabilizing tank 22; the inlet of the delivery pump 21 is connected to the water outlet of the recovery container 1, and the outlet is connected to the pressure stabilizing tank 22 and one end of the first pipeline 3; the pressure stabilizing tank 22 is used to stabilize the outlet pressure of the delivery pump 21 when the pump stops running; based on the arrangement of the pressure stabilizing tank 22, the outlet pressure of the delivery pump 21 can be maintained stable, reducing the frequent start and stop of the delivery pump 21.

[0035] Preferably, the pressure stabilizing tank 22 comprises a first tank body 221 and a first elastic bag 222; the inlet of the first tank body 221 is connected to the outlet of the delivery pump 21; the first elastic bag 222 is arranged in the first tank body 221 and has an opening in sealed connection with the inlet of the first tank body 221; the first elastic bag 222 can adjust the outlet pressure of the delivery pump 21 when the outlet pressure of the delivery pump 21 deviates from the required pressure; that is, when the outlet pressure of the delivery pump 21 is higher than the required pressure, the first elastic bag 222 expands, and the outlet pressure of the delivery pump 21 decreases; when the outlet pressure of the delivery pump 21 is lower than the required pressure, the first elastic bag 222 is compressed, and the outlet pressure of the delivery pump 21 increases; the space between the first tank body 221 and the first elastic bag 222 is filled with pressure gas, thereby avoiding the contact between the concentrated water and air, and the air dissolution affecting the pressure stabilizing effect.

[0036] Further preferably, the second tank body 223 is provided with a gas filling port, and the second elastic bag 224 is provided with an opening which is sealedly connected with the gas filling port and is communicated with an external pressure system, so as to change the gas pressure in the second elastic bag 224 to adapt to different working conditions of different required pressures.

[0037] Further preferably, the second tank body 223 is provided with a gas filling port, and the second elastic bag 224 is provided with an opening which is sealedly connected with the gas filling port and is communicated with an external pressure system, so as to change the gas pressure in the second elastic bag 224 to adapt to different working conditions of different required pressures.

[0038] Preferably, the first tank body 221 and the second tank body 223 are communicated through a water inlet pipe 227 and a water return pipe 228, wherein the water inlet pipe 227 is provided with a fourth one-way valve 229, and the water return pipe 228 is provided with a fifth one-way valve 2210, so as to form a liquid circulation to improve the heat dissipation effect of the second elastic bag 224. Further preferably, the position of the water inlet pipe 227 communicated with the second tank body 223 is arranged opposite to the second elastic bag 224 and below the second elastic bag 224, and the position of the water return pipe 228 communicated with the second tank body 223 is arranged opposite to the position of the water inlet pipe 227, so as to promote the upward flow of the liquid in the second tank body 223 after heat exchange, to take away the heat, and to circulate to the first tank body 221 through the water return pipe 228.

[0039] In some preferred embodiments, such as Figure 3As shown, the pressure stabilizing tank 22 further comprises a third one-way valve 225 and a self-acting pressure regulating valve 226; the third one-way valve 225 is in one-way communication between the outlet of the delivery pump 21 and the first elastic bag 222; the self-acting pressure regulating valve 226 is in communication between the first elastic bag 222 and the outlet of the delivery pump 21, and is used for regulating the outlet pressure of the delivery pump 21, i.e. when the outlet pressure of the delivery pump 21 is increased to exceed the required pressure, the third one-way valve 225 is opened, and the concentrated water enters the first elastic bag 222 to reduce the outlet pressure of the delivery pump 21, and when the outlet pressure is reduced to the required pressure, the third one-way valve 225 is closed, and normal liquid supply is achieved, and when the outlet pressure of the delivery pump 21 is reduced to below the required pressure, the self-acting pressure regulating valve 226 is used to deliver concentrated water to the outlet pipeline of the delivery pump 21 to increase the outlet pressure; based on this, the accuracy of the adjustment of the outlet pressure of the delivery pump 21 is improved, and the frequency of the start and stop of the delivery pump 21 is reduced.

[0040] In some preferred embodiments, the delivery pump 21 is a variable frequency pump.

[0041] Embodiment 2 The embodiment provides a working method of the concentrated water recycling system in the above embodiment 1, and the working method comprises the following steps: When water is used, the second one-way valve 42 of the second pipeline 4 is opened under the action of the pressure difference between the two sides, the first one-way valve 32 of the first pipeline 3 is closed, and water is supplied by an external water supply system; The controller 7 acquires the measurement value of the liquid level measuring element 5, If the measurement value of the liquid level measuring element 5 is greater than zero, the controller 7 controls the water outlet device 2 to start; The controller 7 acquires the measurement value of the pressure measuring element 6, and adjusts the rotating speed of the water outlet device 2 according to the comparison between the measurement value of the pressure measuring element 6 and the required pressure, so as to maintain the measurement value of the pressure measuring element 6 at the required pressure; After the water outlet device 2 normally works, the first one-way valve 32 is opened under the action of the pressure difference between the two sides, the second one-way valve 42 is closed under the action of the pressure difference between the two sides, the external water supply system stops supplying water, and the water supply is switched to the recycling container 1; If the measurement value of the liquid level measuring element 5 is equal to zero, the controller 7 controls the water outlet device 2 to stop, and water is supplied by the external water supply system.

[0042] The working method of the application not only realizes the utilization of concentrated water, avoids the waste of concentrated water, and can automatically switch concentrated water and external water when water is used, realizes continuous water supply, and guarantees the continuity of water supply.

[0043] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection of the present application.

Claims

1. A concentrated water recycling system for an industrial pure water machine, characterized by, The application relates to a water recovery system, which comprises a recovery container, a water outlet device, a first pipeline, a second pipeline, a liquid level measuring element, a pressure measuring element and a controller. The recovery container is used for storing concentrated water. The water inlet end of the water outlet device is communicated with the water outlet of the recovery container, and the water outlet end is communicated with one end of the first pipeline, so as to output the concentrated water in the recovery container. The other end of the first pipeline is a water outlet end. One end of the second pipeline is used for being communicated with an external water supply system, and the other end is communicated with the water outlet end of the first pipeline. The second pipeline is a one-way conducting structure and is in a closed state when the water outlet device is working. The liquid level measuring element is used for measuring the liquid level of the recovery container. The pressure measuring element is used for measuring the outlet pressure of the water outlet device.

2. The concentrated water recycling system of the industrial pure water machine according to claim 1, characterized in that, The controller is electrically connected with the liquid level measuring element and the pressure measuring element, so as to control the start and stop of the water outlet device based on the measurement value of the liquid level measuring element and control the outlet pressure of the water outlet device based on the measurement value of the pressure measuring element. The second pipeline comprises a second pipeline and a second one-way valve. One end of the second pipeline is used for being communicated with an external water supply system, and the other end is communicated with the water outlet end of the first pipeline.

3. The concentrated water recycling system of the industrial pure water machine according to claim 1, characterized in that, The second one-way valve is arranged on the second pipeline and is used for one-way conduction from the external water supply system to the water outlet end of the first pipeline. The first pipeline comprises a first pipeline and a first one-way valve. One end of the first pipeline is communicated with the water outlet end of the water outlet device, and the other end is a water outlet end.

4. The concentrated water recycling system of the industrial pure water machine according to claim 1, characterized by, The first one-way valve is arranged on the first pipeline and is used for one-way conduction from the water outlet end of the water outlet device to the water outlet end of the first pipeline. The water outlet device comprises a conveying pump and a pressure stabilizing tank. The inlet of the conveying pump is communicated with the water outlet of the recovery container, and the outlet is communicated with one end of the first pipeline and the pressure stabilizing tank.

5. The concentrated water recycling system of the industrial pure water machine according to claim 4, characterized in that, The pressure stabilizing tank is used for stabilizing the outlet pressure of the conveying pump when the pump stops working. The pressure stabilizing tank comprises a first tank body and a first elastic bag. The inlet of the first tank body is communicated with the outlet of the conveying pump.

6. The concentrated water recycling system of the industrial pure water machine according to claim 5, characterized in that, The first elastic bag is arranged in the first tank body and has an opening which is sealingly connected with the inlet of the first tank body. The first elastic bag can adjust the outlet pressure of the conveying pump when the outlet pressure deviates from the required pressure. The pressure stabilizing tank further comprises a second tank body and a second elastic bag.

7. The concentrated water recycling system of the industrial pure water machine according to claim 6, characterized in that, The second tank body is communicated with the space between the first tank body and the first elastic bag. The second elastic bag is arranged in the second tank body and is filled with pressure gas, so as to adjust the outlet pressure of the conveying pump through compression or expansion of the pressure gas. The space between the second tank body and the second elastic bag and the space between the first tank body and the first elastic bag are filled with liquid. The second tank body is provided with a gas filling port. The second elastic bag has an opening connected to the inflation port in a sealed manner, and is connected to an external pressure system to change the gas pressure in the second elastic bag.

8. The concentrated water recycling system of the industrial pure water machine according to claim 5, characterized in that, The pressure stabilizing tank further comprises a third one-way valve and a self-acting pressure regulating valve. The third one-way valve is connected in one direction from the outlet of the delivery pump to the first elastic bag, and the self-acting pressure regulating valve is connected between the first elastic bag and the outlet of the delivery pump to regulate the pressure of the outlet of the delivery pump. The delivery pump is a variable frequency pump.

9. The concentrated water recycling system of the industrial pure water machine according to claim 4, characterized by, The method comprises the following steps:

10. A method of operating a concentrated water reuse system as defined in any one of claims 1 to 9, characterized by, When water is used, the second one-way valve of the second pipeline is opened, the first one-way valve of the first pipeline is closed, and water is supplied by an external water supply system; The controller acquires the measurement value of the liquid level measuring element, If the measurement value of the liquid level measuring element is greater than zero, the controller controls the water outlet device to start; The controller acquires the measurement value of the pressure measuring element, compares the measurement value of the pressure measuring element with a required pressure, and adjusts the rotating speed of the water outlet device to maintain the measurement value of the pressure measuring element at the required pressure; After the water outlet device is normally operated, the first one-way valve is opened under the pressure difference between both sides, the second one-way valve is closed under the pressure difference between both sides, the external water supply system stops supplying water, and the water supply is switched to the recovery container; If the measurement value of the liquid level measuring element is equal to zero, the controller controls the water outlet device to stop, and water is supplied by the external water supply system. ​

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