Automatic control system for soft water production

Abstract

This application provides an automatic control system for soft water production, comprising: an input end of a water softener connected to a municipal water supply network, and an output end connected to a concentrate tank and a circulating water tank respectively; a raw water pump connects the municipal water supply network and the water softener; a first level gauge is installed inside the concentrate tank, and its output end is connected to a drainage network via a drain pump; a circulating water tank is circulatedly connected to an external cooling device and has a second level gauge installed inside; a PLC is electrically connected to both the first and second level gauges and configured to control the start and stop of the raw water pump and the drain pump. By installing a second level gauge in the circulating water tank, and coordinating with the PLC's linkage control, the raw water pump can automatically replenish water according to the water level in the circulating tank; simultaneously, a concentrate tank is installed between the concentrate outlet of the water softener and the drainage network for transition, effectively solving the potential problem of increased water pressure due to poor water flow during pipeline discharge when the drainage network is too far away, thus affecting the quality of pure water.

Description

Technical Field

[0001] This application relates to the field of soft water treatment technology, specifically to an automatic control system for soft water production. Background Technology

[0002] All-liquid air separation requires circulating water to cool equipment such as centrifugal compressors, compressor motors, and expanders. The coolers are mostly shell-and-tube coolers, with water flowing inside the tubes and compressed air needing to be cooled outside. The temperature of the compressed air is around 120℃. If the water quality is poor, scale can easily form, clogging the pipes inside the cooler, reducing the heat dissipation effect of the cooler, reducing the production of liquid oxygen and liquid nitrogen, and increasing energy consumption. Therefore, the development of an automatic pure water supply system is an urgent problem to be solved. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an automatic control system for soft water production.

[0004] This application provides an automatic control system for soft water production, including...

[0005] A water softener, wherein the input end of the water softener is connected to the tap water network, and the output end is connected to a concentrated water tank and a circulating water tank respectively;

[0006] The tap water network and the water softener are connected by a raw water pump, which is used to pressurize the raw water.

[0007] The concentrated water tank is equipped with a first level gauge, the output of which is connected to the drainage network via a drainage pump.

[0008] The circulating water tank is connected to an external cooling device and is equipped with a second level gauge inside.

[0009] The PLC is electrically connected to the first level gauge and the second level gauge respectively, and is configured to receive the detection data of the second level gauge to control the start and stop of the raw water pump and receive the detection data of the first level gauge to control the start and stop of the drainage pump.

[0010] Furthermore,

[0011] The water softener is equipped with an inlet, a concentrated water outlet, and a pure water outlet.

[0012] The pure water outlet is connected to the circulating water tank via a pipe.

[0013] The concentrate outlet is connected to the concentrate tank via a pipe.

[0014] The water inlet is connected to the raw water pump and the drainage pump respectively via a first three-way valve.

[0015] Furthermore,

[0016] The output end of the drainage pump is connected to the drainage network and the first three-way valve respectively through the second three-way valve;

[0017] The PLC is also electrically connected to the first three-way valve and the second three-way valve respectively, and is configured to control the synchronous switching of the connection between the first three-way valve and the second three-way valve.

[0018] Furthermore,

[0019] The concentrate tank is also equipped with a TDS sensor to detect the total dissolved solids content in the concentrate.

[0020] The PLC is also electrically connected to the TDS sensor and is configured to determine the relationship between the TDS value of the concentrate and the set value, and control the output state of the second three-way valve.

[0021] Furthermore,

[0022] The pure water outlet is also equipped with a conductivity sensor for real-time monitoring of the conductivity of the pure water.

[0023] The PLC is also electrically connected to the conductivity sensor and is configured to receive the conductivity of the pure water and determine the state of the resin layer based on the fluctuation of the conductivity.

[0024] Furthermore,

[0025] The water softener is also equipped with a backwashing mechanism;

[0026] The backwashing mechanism includes a water distribution device and a control valve;

[0027] The water distribution device is located at the bottom of the resin layer and is used to evenly distribute backwash water to the bottom of the resin layer.

[0028] The control valve is located at the water inlet and is used to switch the direction of water flow.

[0029] Furthermore,

[0030] The PLC is also electrically connected to the control valve and is configured to switch the flow direction of the control valve based on the conductivity data of the pure water.

[0031] Furthermore,

[0032] The water softener is also equipped with a drain outlet;

[0033] The sewage outlet is directly connected to the drainage pipe network.

[0034] The advantages and positive effects of this application are:

[0035] This technical solution installs a second level gauge in the circulating water tank, which, in conjunction with the PLC's linkage control, allows the raw water pump to automatically replenish water according to the water level in the circulating water tank. At the same time, a concentrated water tank is also installed between the concentrated water outlet of the water softener and the drainage network for transition, effectively solving the potential problem of increased water pressure due to poor water flow when the drainage network is too far away, which could affect the quality of pure water.

[0036] Furthermore, by setting up a concentrate tank, the concentrate can be treated again when the TDS value is relatively low, effectively improving the utilization rate. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of an automatic control system for soft water production provided in an embodiment of this application.

[0038] The text labels in the diagram are as follows: 100-Water softener; 101-Inlet; 102-Concentrate outlet; 103-Pure water outlet; 110-Raw water pump; 200-Concentrate tank; 210-Drain pump; 300-Circulating water tank. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solution of this application, the application will be described in detail below with reference to the accompanying drawings. The description in this section is only exemplary and explanatory, and should not be used to limit the scope of protection of this application.

[0040] Please refer to Figure 1 This embodiment provides an automatic control system for soft water production, including a water softener 100. The input end of the water softener 100 is connected to a tap water network, and the output end is connected to a concentrate tank 200 and a circulating water tank 300, respectively. The tap water network is connected to the water softener 100 via a raw water pump 110 for pressurizing the raw water. The concentrate tank 200 is equipped with a first level gauge, and its output end is connected to a drainage network via a drain pump 210. The circulating water tank 300 is circulatedly connected to an external cooling device and is equipped with a second level gauge. A PLC is electrically connected to the first and second level gauges, and is configured to receive detection data from the second level gauge to control the start and stop of the raw water pump 110 and receive detection data from the first level gauge to control the start and stop of the drain pump 210.

[0041] In this embodiment, the input end of the raw water pump 110 is connected to the tap water network, and the output end is connected to the water softener 100. At the same time, the raw water pump 110 is also controlled by a frequency converter, which can stably pressurize the tap water to 0.3-0.4 MPa and deliver it to the water softener 100.

[0042] In this embodiment, the circulating water tank 300 is circulatedly connected to an external cooling device. Due to losses during the cooling process, the water depth in the circulating water tank 300 will also change accordingly. When the second level gauge detects that the liquid level has reached the set minimum level, the PLC will control the raw water pump 110 to start; conversely, when the second level gauge detects that the liquid level has reached the set maximum level, the raw water pump 110 will stop working.

[0043] In this embodiment, the drain pump 110 is a submersible pump installed inside the concentrate tank 200. When the first level gauge detects that the liquid level in the concentrate tank 200 has reached the set maximum level, the PLC will control the drain pump 110 to start, thereby discharging the concentrate into the drainage network. Conversely, when the liquid level in the concentrate tank 200 is lower than the set minimum level, the PLC will control the drain pump 110 to stop working.

[0044] In a preferred embodiment, the water softener 100 is provided with an inlet 101, a concentrated water outlet 102, and a pure water outlet 103; the pure water outlet 103 is connected to the circulating water tank 300 via a pipe; the concentrated water outlet 102 is connected to the concentrated water tank 200 via a pipe; and the inlet 101 is connected to the raw water pump 110 and the drain pump 210 via a first three-way valve.

[0045] In this embodiment, the output end of the first three-way valve is installed on the inlet 101, and the input end is connected to the raw water pump 110 and the drain pump 210 respectively, so as to treat the tap water and further treat the concentrated water in the concentrated water tank 200.

[0046] In a preferred embodiment, the output end of the drainage pump 210 is connected to the drainage network and the first three-way valve respectively through the second three-way valve; the PLC is also electrically connected to the first three-way valve and the second three-way valve respectively, and is configured to control the synchronous switching of the connection between the first three-way valve and the second three-way valve.

[0047] In this embodiment, the input end of the second three-way valve is connected to the output end of the drain pump 210, and the two output ends are respectively connected to the first three-way valve and the drain pipe network. When the concentrated water needs to be treated again, the drain pump 210 and the inlet 101 can be connected by controlling the state of the first three-way valve and the second three-way valve.

[0048] In a preferred embodiment, the concentrate tank 200 is further equipped with a TDS sensor for detecting the total dissolved solids content in the concentrate; the PLC is also electrically connected to the TDS sensor and configured to determine the relationship between the TDS value of the concentrate and a set value, and control the output state of the second three-way valve.

[0049] In this embodiment, the PLC is electrically connected to the TDS sensor, which enables the PLC to effectively obtain the TDS value of the concentrate. By comparing it with the set value, the PLC can control the direction of the second three-way valve according to the judgment result.

[0050] In this embodiment, when the liquid level inside the circulating water tank 300 checked by the second liquid level gauge is lower than the set low liquid level, the PLC first determines whether the liquid level inside the concentrate tank 200 is higher than the set liquid level. If it is lower than the set liquid level, the PLC directly controls the raw water pump 110 to start. If it is higher than the set liquid level, the PLC continues to determine whether the TDS value is lower than the set value. If it is higher than the set value, the PLC directly starts the raw water pump and starts the drain pump 210 to discharge the concentrate to the set low liquid level. If it is lower than the set value, the PLC starts the drain pump 210 and simultaneously switches the first three-way valve and the second three-way valve to transport the concentrate to the water softener 100 for further processing.

[0051] In this embodiment, the set liquid level of the concentrate is between the high liquid level and the low liquid level. The set height satisfies both the need to ensure that there is a sufficient amount for reprocessing and to prevent the concentrate generated in a single batch from directly exceeding the set liquid level to reach the high liquid level.

[0052] In this embodiment, when the liquid level in the concentrate tank 200 reaches the high level, the PLC will directly start the drain pump 210 and control the second three-way valve to connect with the drain pipe network to discharge the concentrate to the low level.

[0053] In a preferred embodiment, the pure water outlet 103 is further provided with a conductivity sensor for real-time monitoring of the conductivity of the pure water; the PLC is also electrically connected to the conductivity sensor and configured to receive the conductivity of the pure water and determine the state of the resin layer based on the fluctuation of the conductivity.

[0054] In this embodiment, the pure water outlet 103 is equipped with a conductivity sensor, which can monitor the conductivity of the pure water in real time. When the conductivity fluctuation exceeds 10%, the PLC will immediately control the water softener 100 to stop working, thereby preventing unqualified pure water from entering the circulating water tank 300.

[0055] In a preferred embodiment, the water softener 100 is further provided with a backwashing mechanism; the backwashing mechanism includes a water distribution device and a control valve; the water distribution device is located at the bottom of the resin layer and is used to evenly distribute the backwash water to the bottom of the resin layer; the control valve is located at the water inlet 101 and is used to switch the flow direction of the incoming water.

[0056] In a preferred embodiment, the PLC is also electrically connected to a control valve and configured to switch the flow direction of the control valve based on the conductivity data of the pure water.

[0057] In this embodiment, when the conductivity of pure water becomes abnormal and the water softener 100 stops, the PLC will switch the control valve to connect the inlet 101 and the water distribution device, thereby backwashing the water softener 100.

[0058] In a preferred embodiment, the water softener 100 is further provided with a drain outlet; the drain outlet is directly connected to the drainage network.

[0059] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. An automatic control system for soft water production, characterized in that, include A water softener (100) has its input end connected to the tap water network and its output end connected to a concentrated water tank (200) and a circulating water tank (300), respectively. The tap water network is connected to the water softener (100) via a raw water pump (110) for pressurizing the raw water; The concentrated water tank (200) is equipped with a first level gauge, and its output end is connected to the drainage network through a drainage pump (210); The circulating water tank (300) is circulatedly connected to the external cooling device and is equipped with a second level gauge inside; The PLC is electrically connected to the first level gauge and the second level gauge respectively, and is configured to receive the detection data of the second level gauge to control the start and stop of the raw water pump (110) and receive the detection data of the first level gauge to control the start and stop of the drainage pump (210).

2. The automatic control system for soft water production according to claim 1, characterized in that, The water softener (100) is provided with an inlet (101), a concentrated water outlet (102) and a pure water outlet (103). The pure water outlet (103) is connected to the circulating water tank (300) via a pipe; The concentrate outlet (102) is connected to the concentrate tank (200) via a pipe; The inlet (101) is connected to the raw water pump (110) and the drainage pump (210) respectively via the first three-way valve.

3. The automatic control system for soft water production according to claim 2, characterized in that, The output end of the drainage pump (210) is connected to the drainage network and the first three-way valve respectively through the second three-way valve; The PLC is also electrically connected to the first three-way valve and the second three-way valve respectively, and is configured to control the synchronous switching of the connection between the first three-way valve and the second three-way valve.

4. The automatic control system for soft water production according to claim 3, characterized in that, The concentrate tank (200) is also equipped with a TDS sensor for detecting the total dissolved solids content in the concentrate. The PLC is also electrically connected to the TDS sensor and is configured to determine the relationship between the TDS value of the concentrate and the set value, and control the output state of the second three-way valve.

5. The automatic control system for soft water production according to claim 2, characterized in that, The pure water outlet (103) is also equipped with a conductivity sensor for real-time monitoring of the conductivity of the pure water; The PLC is also electrically connected to the conductivity sensor and is configured to receive the conductivity of the pure water and determine the state of the resin layer based on the fluctuation of the conductivity.

6. The automatic control system for soft water production according to claim 5, characterized in that, The water softener (100) is also equipped with a backwashing mechanism; The backwashing mechanism includes a water distribution device and a control valve; The water distribution device is located at the bottom of the resin layer and is used to evenly distribute backwash water to the bottom of the resin layer. The control valve is located at the water inlet (101) and is used to switch the direction of water flow.

7. The automatic control system for soft water production according to claim 6, characterized in that, The PLC is also electrically connected to the control valve and is configured to switch the flow direction of the control valve based on the conductivity data of the pure water.

8. The automatic control system for soft water production according to claim 6, characterized in that, The water softener (100) is also equipped with a drain outlet; The sewage outlet is directly connected to the drainage pipe network.

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