WO2017152314A1 - Multi-stage reverse-osmosis filtration system based on wheatstone bridge measurement principle - Google Patents
Multi-stage reverse-osmosis filtration system based on wheatstone bridge measurement principle Download PDFInfo
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Abstract
Provided is a multi-stage reverse-osmosis filtration system based on the Wheatstone-bridge measurement principle, comprising a drive mechanism, a filtration mechanism, a storage mechanism, a measurement mechanism, and a central control device; the drive mechanism, filtration mechanism, and storage mechanism are electrically connected to the central control device; the drive mechanism comprises a primary high-pressure pump (1), and a secondary high-pressure pump (4); the filtration mechanism comprises a primary reverse-osmosis unit (2) and a secondary reverse-osmosis unit (5); by means of five reverse-osmosis components in the primary reverse-osmosis unit (2), the multi-stage reverse-osmosis filtration system performs primary filtration of water, then, by means of three reverse-osmosis components in the secondary reverse-osmosis unit (5), performs secondary filtration of the water; the two-stage filtration ensures the reliability of the filtered water; in addition, a follower circuit mainly using a second operational amplifier is added to the flow-rate measurement circuit, improving the isolation of the measurement circuit and preventing interference to the system, thus improving the reliability of the system.
Description
本发明涉及一种基于惠斯顿电桥测量原理的多级反渗透过滤系统。The invention relates to a multi-stage reverse osmosis filtration system based on the principle of Wheatstone bridge measurement.
在现在的水过滤系统中，为了保证对水的过滤的可靠性，需要从以下两个方面入手。一是，通过对水的过滤的效率，在现有技术中，都是采用简单的沉淀过滤的方法，这种过滤效果一般，无法满足人们的要求。二是，对水流进行稳定控制，从而保证对水的充分过滤。而在水流的控制过程中，需要对水流进行实时监测。在现有技术中，由于水流检测电路缺少对系统隔离保护作用，往往会对系统造成干扰，降低了系统运行的可靠性。In the current water filtration system, in order to ensure the reliability of the filtration of water, it is necessary to start from the following two aspects. First, by the efficiency of filtering water, in the prior art, a simple method of precipitation filtration is adopted, and this filtering effect is generally unsatisfactory. The second is to stabilize the flow of water to ensure adequate filtration of water. In the process of water flow control, real-time monitoring of water flow is required. In the prior art, since the water flow detecting circuit lacks the protection function for the system isolation, it often causes interference to the system and reduces the reliability of the system operation.
发明内容Summary of the invention
本发明要解决的技术问题是：为了克服现有技术过滤效果一般且可靠性差的不足，提供一种过滤效果好且稳定可靠的基于惠斯顿电桥测量原理的多级反渗透过滤系统。The technical problem to be solved by the present invention is to provide a multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle with good filtering effect and stable and reliable in order to overcome the general filtering effect and poor reliability of the prior art.
本发明解决其技术问题所采用的技术方案是：一种基于惠斯顿电桥测量原理的多级反渗透过滤系统，包括驱动机构、过滤机构、存储机构、测量机构和中央控制装置，所述驱动机构、过滤机构、存储机构均与中央控制装置电连接，所述驱动机构包括一级高压泵和二级高压泵，所述过滤机构包括一级反渗透单元和二级反渗透单元，所述一级高压泵通过一级反渗透单元与二级高压泵连通，所述二级高压泵通过二级反渗透单元与存储机构连通，所述测量机构包括流量传感器，所述一级反渗透单元和二级反渗透单元均与流量传感器电连接；The technical solution adopted by the present invention to solve the technical problem thereof is: a multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle, comprising a driving mechanism, a filtering mechanism, a storage mechanism, a measuring mechanism and a central control device, The driving mechanism, the filtering mechanism and the storage mechanism are all electrically connected to the central control device, the driving mechanism comprises a first-stage high-pressure pump and a second-stage high-pressure pump, and the filtering mechanism comprises a first-stage reverse osmosis unit and a second-stage reverse osmosis unit, The first stage high pressure pump is connected to the second stage high pressure pump through a first stage reverse osmosis unit, and the second stage high pressure pump is connected to the storage mechanism through the second stage reverse osmosis unit, the measuring mechanism comprises a flow sensor, the first stage reverse osmosis unit and The secondary reverse osmosis unit is electrically connected to the flow sensor;
所述一级反渗透单元包括五个反渗透组件，所述二级反渗透单元包括三个反渗透组件，所述反渗透组件均设有两个出水管，其中一个出水管为浓缩水出
水管，另一个出水管为纯净水出水管，所述出水管与流量传感器连接；The first stage reverse osmosis unit comprises five reverse osmosis units, and the second stage reverse osmosis unit comprises three reverse osmosis units, wherein the reverse osmosis unit is provided with two outlet pipes, one of which is a concentrated water outlet.
a water pipe, the other outlet pipe is a pure water outlet pipe, and the outlet pipe is connected to the flow sensor;
所述中央控制装置中设有流量检测模块，所述流量传感器与流量检测模块电连接，所述流量检测模块包括流量检测电路，所述流量检测电路包括第一运算放大器、第二运算放大器、第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、第六电阻和第七电阻，所述第一运算放大器的正相输入端通过第五电阻和第一电阻组成的串联电路外接5V直流电压电源，所述第一运算放大器的正相输入端通过第五电阻和第二电阻组成的串联电路接地，所述第一运算放大器的反相输入端通过第六电阻和第三电阻组成的串联电路外接5V直流电压电源，所述第一运算放大器的反相输入端通过第六电阻和第四电阻组成的串联电路接地，所述第一运算放大器的正相输入端通过第七电阻与第一运算放大器的输出端连接，所述第一运算放大器的输出端与第二运算放大器的正相输入端连接，所述第二运算放大器的反相输入端接地，所述第二运算放大器的正相输入端与第二运算放大器的输出端连接。a flow detection module is disposed in the central control device, the flow sensor is electrically connected to the flow detection module, the flow detection module includes a flow detection circuit, and the flow detection circuit includes a first operational amplifier, a second operational amplifier, and a a resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor, wherein the non-inverting input terminal of the first operational amplifier passes through a series circuit composed of a fifth resistor and a first resistor An external 5V DC voltage power supply is connected, the non-inverting input end of the first operational amplifier is grounded through a series circuit comprising a fifth resistor and a second resistor, and the inverting input end of the first operational amplifier passes through the sixth resistor and the third resistor The serial circuit is externally connected to a 5V DC voltage power supply, and the inverting input terminal of the first operational amplifier is grounded through a series circuit composed of a sixth resistor and a fourth resistor, and the non-inverting input terminal of the first operational amplifier passes through the seventh resistor Connected to the output of the first operational amplifier, the output of the first operational amplifier and the positive input of the second operational amplifier The terminal is connected, the inverting input of the second operational amplifier is grounded, and the non-inverting input of the second operational amplifier is connected to the output of the second operational amplifier.
作为优选，所述存储机构包括储水罐。Advantageously, said storage mechanism comprises a water storage tank.
作为优选，所述反渗透组件中设有反渗透膜。Preferably, a reverse osmosis membrane is provided in the reverse osmosis module.
作为优选，所述中央控制装置为PLC。Preferably, the central control device is a PLC.
作为优选，为了增加系统的在线监控功能，通过无线通讯模块能够使得系统与后台进行实时通讯连接，所述中央控制装置中设有无线通讯模块，所述无线通讯模块通过WIFI传输无线信号。Preferably, in order to increase the online monitoring function of the system, the wireless communication module enables the system to perform real-time communication connection with the background. The central control device is provided with a wireless communication module, and the wireless communication module transmits the wireless signal through the WIFI.
作为优选，通过流量传感器对流量进行监测，根据流量大小从而调节第一电阻的阻值的大小，从而能够对流量的大小进行实时检测，所述第一电阻为可调电阻，所述第一电阻与流量传感器电连接。Preferably, the flow rate sensor monitors the flow rate, and adjusts the resistance value of the first resistor according to the flow rate, so that the flow rate can be detected in real time, the first resistor is an adjustable resistor, and the first resistor is Electrically connected to the flow sensor.
作为优选，所述第一运算放大器和第二运算放大器的型号均为LMV324。
Preferably, the models of the first operational amplifier and the second operational amplifier are both LMV324.
本发明的有益效果是，该基于惠斯顿电桥测量原理的多级反渗透过滤系统通过一级反渗透单元中的五个反渗透组件，对水进行一级过滤，随后通过二级反渗透单元中的三个反渗透组件，对水进行二级过滤，通过两级过滤，从而保证了过滤水的可靠性；不仅如此，在流量检测电路中，加入了以第二运算放大器为主的跟随电路，提高了检测电路的隔离作用，防止对系统造成干扰，从而提高了系统的可靠性。The invention has the beneficial effects that the multi-stage reverse osmosis filtration system based on the Wheatstone bridge measuring principle passes the five reverse osmosis components in the first-stage reverse osmosis unit to perform primary filtration on the water, and then through the secondary reverse osmosis. The three reverse osmosis components in the unit perform secondary filtration on water and pass two-stage filtration to ensure the reliability of the filtered water. Moreover, in the flow detection circuit, a second operational amplifier-based follow-up is added. The circuit improves the isolation of the detection circuit and prevents interference to the system, thereby improving the reliability of the system.
下面结合附图和实施例对本发明进一步说明。The invention will now be further described with reference to the drawings and embodiments.
图1是本发明的基于惠斯顿电桥测量原理的多级反渗透过滤系统的结构示意图；1 is a schematic structural view of a multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle of the present invention;
图2是本发明的基于惠斯顿电桥测量原理的多级反渗透过滤系统的流量检测电路的电路原理图；2 is a circuit schematic diagram of a flow detection circuit of a multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle of the present invention;
图中：1.一级高压泵，2.一级反渗透单元，3.流量传感器，4.二级高压泵，5.二级反渗透单元，6.储水罐，7.纯净水出水管，8.浓缩水出水管，R1.第一电阻，R2.第二电阻，R3.第三电阻，R4.第四电阻，R5.第五电阻，R6.第六电阻，R7.第七电阻，U1.第一运算放大器，U2.第二运算放大器。In the figure: 1. First-stage high-pressure pump, 2. First-stage reverse osmosis unit, 3. Flow sensor, 4. Secondary high-pressure pump, 5. Secondary reverse osmosis unit, 6. Water storage tank, 7. Pure water outlet pipe 8. Concentrated water outlet pipe, R1. First resistance, R2. Second resistance, R3. Third resistance, R4. Fourth resistance, R5. Fifth resistance, R6. Sixth resistance, R7. Seventh resistance, U1. First operational amplifier, U2. Second operational amplifier.
现在结合附图对本发明作进一步详细的说明。这些附图均为简化的示意图，仅以示意方式说明本发明的基本结构，因此其仅显示与本发明有关的构成。The invention will now be described in further detail with reference to the drawings. The drawings are simplified schematic diagrams, and only the basic structure of the present invention is illustrated in a schematic manner, and thus only the configurations related to the present invention are shown.
如图1和图2所示，一种基于惠斯顿电桥测量原理的多级反渗透过滤系统，包括驱动机构、过滤机构、存储机构、测量机构和中央控制装置，所述驱动机构、过滤机构、存储机构均与中央控制装置电连接，所述驱动机构包括一级高压泵1和二级高压泵4，所述过滤机构包括一级反渗透单元2和二级反渗透单元
5，所述一级高压泵1通过一级反渗透单元2与二级高压泵4连通，所述二级高压泵4通过二级反渗透单元5与存储机构连通，所述测量机构包括流量传感器3，所述一级反渗透单元2和二级反渗透单元5均与流量传感器3电连接；As shown in FIG. 1 and FIG. 2, a multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle includes a driving mechanism, a filtering mechanism, a storage mechanism, a measuring mechanism, and a central control device, and the driving mechanism and filtering The mechanism and the storage mechanism are electrically connected to the central control device, and the driving mechanism comprises a first-stage high-pressure pump 1 and a second-stage high-pressure pump 4, and the filtering mechanism comprises a first-stage reverse osmosis unit 2 and a second-stage reverse osmosis unit.
5. The first stage high pressure pump 1 is in communication with a secondary high pressure pump 4 through a primary reverse osmosis unit 2, the secondary high pressure pump 4 being in communication with a storage mechanism via a secondary reverse osmosis unit 5, the measuring mechanism comprising a flow sensor 3. The first-stage reverse osmosis unit 2 and the second-stage reverse osmosis unit 5 are electrically connected to the flow sensor 3;
所述一级反渗透单元2包括五个反渗透组件，所述二级反渗透单元5包括三个反渗透组件，所述反渗透组件均设有两个出水管，其中一个出水管为浓缩水出水管8，另一个出水管为纯净水出水管7，所述出水管与流量传感器3连接；The primary reverse osmosis unit 2 comprises five reverse osmosis modules, and the second reverse osmosis unit 5 comprises three reverse osmosis modules, each of which is provided with two outlet pipes, one of which is concentrated water The outlet pipe 8 and the other outlet pipe are pure water outlet pipes 7, and the outlet pipes are connected to the flow sensor 3;
所述中央控制装置中设有流量检测模块，所述流量传感器3与流量检测模块电连接，所述流量检测模块包括流量检测电路，所述流量检测电路包括第一运算放大器U1、第二运算放大器U2、第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4、第五电阻R5、第六电阻R6和第七电阻R7，所述第一运算放大器U1的正相输入端通过第五电阻R5和第一电阻R1组成的串联电路外接5V直流电压电源，所述第一运算放大器U1的正相输入端通过第五电阻R5和第二电阻R2组成的串联电路接地，所述第一运算放大器U1的反相输入端通过第六电阻R6和第三电阻R3组成的串联电路外接5V直流电压电源，所述第一运算放大器U1的反相输入端通过第六电阻R6和第四电阻R4组成的串联电路接地，所述第一运算放大器U1的正相输入端通过第七电阻R7与第一运算放大器U1的输出端连接，所述第一运算放大器U1的输出端与第二运算放大器U2的正相输入端连接，所述第二运算放大器U2的反相输入端接地，所述第二运算放大器U2的正相输入端与第二运算放大器U2的输出端连接。The central control device is provided with a flow detection module, the flow sensor 3 is electrically connected to the flow detection module, the flow detection module includes a flow detection circuit, and the flow detection circuit includes a first operational amplifier U1 and a second operational amplifier. U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, wherein the positive input terminal of the first operational amplifier U1 passes a series circuit composed of a fifth resistor R5 and a first resistor R1 is externally connected to a 5V DC voltage power supply, and a non-inverting input terminal of the first operational amplifier U1 is grounded through a series circuit composed of a fifth resistor R5 and a second resistor R2. An inverting input terminal of an operational amplifier U1 is externally connected to a 5V DC voltage power supply through a series circuit composed of a sixth resistor R6 and a third resistor R3, and an inverting input terminal of the first operational amplifier U1 passes through a sixth resistor R6 and a fourth resistor A series circuit composed of R4 is grounded, and a non-inverting input terminal of the first operational amplifier U1 is connected to an output terminal of the first operational amplifier U1 through a seventh resistor R7, the first operational amplifier U1 The output terminal is connected to the non-inverting input terminal of the second operational amplifier U2, the inverting input terminal of the second operational amplifier U2 is grounded, and the non-inverting input terminal of the second operational amplifier U2 and the output of the second operational amplifier U2 End connection.
作为优选，所述存储机构包括储水罐6。Preferably, the storage mechanism comprises a water storage tank 6.
作为优选，所述反渗透组件中设有反渗透膜。Preferably, a reverse osmosis membrane is provided in the reverse osmosis module.
作为优选，所述中央控制装置为PLC。Preferably, the central control device is a PLC.
作为优选，为了增加系统的在线监控功能，通过无线通讯模块能够使得系
统与后台进行实时通讯连接，所述中央控制装置中设有无线通讯模块，所述无线通讯模块通过WIFI传输无线信号。Preferably, in order to increase the online monitoring function of the system, the system can be enabled by the wireless communication module.
The system and the background are connected in real time, and the central control device is provided with a wireless communication module, and the wireless communication module transmits the wireless signal through the WIFI.
作为优选，通过流量传感器3对流量进行监测，根据流量大小从而调节第一电阻R1的阻值的大小，从而能够对流量的大小进行实时检测，所述第一电阻R1为可调电阻，所述第一电阻R1与流量传感器3电连接。Preferably, the flow rate sensor 3 monitors the flow rate, and the magnitude of the resistance of the first resistor R1 is adjusted according to the flow rate, so that the magnitude of the flow rate can be detected in real time, and the first resistor R1 is an adjustable resistor. The first resistor R1 is electrically connected to the flow sensor 3.
作为优选，所述第一运算放大器U1和第二运算放大器U2的型号均为LMV324。Preferably, the models of the first operational amplifier U1 and the second operational amplifier U2 are both LMV324.
该基于惠斯顿电桥测量原理的多级反渗透过滤系统中，通过驱动机构保证过滤机构能够对水进行稳定可靠的过滤，最后进入存储机构中进行存储。当然为了保证过滤机构的过滤稳定性和可靠性，需要通过测量机构对各处的水流量进行实时监测，从而能够反馈给驱动机构，使得驱动机构能够保证水流量的稳定；同时通过过滤机构对水的多级反渗透，从而能够保证过滤水的效率和可靠性。其中，一级反渗透单元2包括五个反渗透组件，为了一级过滤，对水进行过滤以后，通过浓缩水出水管8将杂质水排出，纯净水出水管7将过滤水排入到二级反渗透单元5中，进行二级过滤，再通过浓缩水出水管8将杂质水排出，纯净水出水管7将过滤水注入到存储机构中，通过两级过滤，从而保证了过滤水的可靠性。In the multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle, the drive mechanism ensures that the filter mechanism can stably and reliably filter the water, and finally enters the storage mechanism for storage. Of course, in order to ensure the filtration stability and reliability of the filtering mechanism, the water flow rate of each part needs to be monitored in real time by the measuring mechanism, so that the driving mechanism can be fed back, so that the driving mechanism can ensure the stability of the water flow; The multi-stage reverse osmosis ensures the efficiency and reliability of the filtered water. Wherein, the first-stage reverse osmosis unit 2 comprises five reverse osmosis modules. After filtering the water for the first-stage filtration, the impurity water is discharged through the concentrated water outlet pipe 8, and the purified water outlet pipe 7 discharges the filtered water into the second stage. In the reverse osmosis unit 5, secondary filtration is performed, and the impurity water is discharged through the concentrated water outlet pipe 8, and the purified water outlet pipe 7 injects the filtered water into the storage mechanism, and the two-stage filtration ensures the reliability of the filtered water. .
在流量检测电路中，通过惠斯顿电桥(由第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4组成)原理，流量传感器3根据流量的大小而改变第一电阻R1的阻值，从而通过以第一运算放大器U1组成的信号放大电路进行信号放大，而且为了提高检测电路的隔离作用，防止对系统造成干扰，加入了以第二运算放大器U2为主的跟随电路，从而提高了系统的可靠性。In the flow detection circuit, the flow sensor 3 changes the first resistor R1 according to the magnitude of the flow rate through the principle of the Wheatstone bridge (composed of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4) The resistance value is thereby amplified by a signal amplifying circuit composed of the first operational amplifier U1, and in order to improve the isolation function of the detecting circuit and prevent interference to the system, a follower circuit mainly composed of the second operational amplifier U2 is added. Thereby improving the reliability of the system.
与现有技术相比，该基于惠斯顿电桥测量原理的多级反渗透过滤系统通过
一级反渗透单元2中的五个反渗透组件，对水进行一级过滤，随后通过二级反渗透单元5中的三个反渗透组件，对水进行二级过滤，通过两级过滤，从而保证了过滤水的可靠性；不仅如此，在流量检测电路中，加入了以第二运算放大器U2为主的跟随电路，提高了检测电路的隔离作用，防止对系统造成干扰，从而提高了系统的可靠性。Compared with the prior art, the multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle passes
The five reverse osmosis modules in the primary reverse osmosis unit 2 perform primary filtration on the water, and then through the three reverse osmosis modules in the secondary reverse osmosis unit 5, the water is subjected to secondary filtration and filtered through two stages. The reliability of the filtered water is ensured; not only that, in the flow detection circuit, a follower circuit mainly composed of the second operational amplifier U2 is added, which improves the isolation function of the detection circuit and prevents interference to the system, thereby improving the system. reliability.
以上述依据本发明的理想实施例为启示，通过上述的说明内容，相关工作人员完全可以在不偏离本项发明技术思想的范围内，进行多样的变更以及修改。本项发明的技术性范围并不局限于说明书上的内容，必须要根据权利要求范围来确定其技术性范围。
In view of the above-described embodiments of the present invention, various changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and the technical scope thereof must be determined according to the scope of the claims.
Claims (7)
- 一种基于惠斯顿电桥测量原理的多级反渗透过滤系统，其特征在于，包括驱动机构、过滤机构、存储机构、测量机构和中央控制装置，所述驱动机构、过滤机构、存储机构均与中央控制装置电连接，所述驱动机构包括一级高压泵(1)和二级高压泵(4)，所述过滤机构包括一级反渗透单元(2)和二级反渗透单元(5)，所述一级高压泵(1)通过一级反渗透单元(2)与二级高压泵(4)连通，所述二级高压泵(4)通过二级反渗透单元(5)与存储机构连通，所述测量机构包括流量传感器(3)，所述一级反渗透单元(2)和二级反渗透单元(5)均与流量传感器(3)电连接；A multi-stage reverse osmosis filtration system based on the Wheatstone bridge measuring principle, comprising: a driving mechanism, a filtering mechanism, a storage mechanism, a measuring mechanism and a central control device, wherein the driving mechanism, the filtering mechanism and the storage mechanism are Electrically connected to the central control device, the drive mechanism comprises a primary high pressure pump (1) and a secondary high pressure pump (4), the filtering mechanism comprising a primary reverse osmosis unit (2) and a secondary reverse osmosis unit (5) The first stage high pressure pump (1) is connected to the secondary high pressure pump (4) through a primary reverse osmosis unit (2), and the secondary high pressure pump (4) passes through the secondary reverse osmosis unit (5) and the storage mechanism Connected, the measuring mechanism includes a flow sensor (3), and the first-stage reverse osmosis unit (2) and the second-stage reverse osmosis unit (5) are electrically connected to the flow sensor (3);所述一级反渗透单元(2)包括五个反渗透组件，所述二级反渗透单元(5)包括三个反渗透组件，所述反渗透组件均设有两个出水管，其中一个出水管为浓缩水出水管(8)，另一个出水管为纯净水出水管(7)，所述出水管与流量传感器(3)连接；The primary reverse osmosis unit (2) comprises five reverse osmosis modules, and the secondary reverse osmosis unit (5) comprises three reverse osmosis modules, each of which is provided with two outlet pipes, one of which is The water pipe is a concentrated water outlet pipe (8), and the other outlet pipe is a pure water outlet pipe (7), and the outlet pipe is connected with the flow sensor (3);所述中央控制装置中设有流量检测模块，所述流量传感器(3)与流量检测模块电连接，所述流量检测模块包括流量检测电路，所述流量检测电路包括第一运算放大器(U1)、第二运算放大器(U2)、第一电阻(R1)、第二电阻(R2)、第三电阻(R3)、第四电阻(R4)、第五电阻(R5)、第六电阻(R6)和第七电阻(R7)，所述第一运算放大器(U1)的正相输入端通过第五电阻(R5)和第一电阻(R1)组成的串联电路外接5V直流电压电源，所述第一运算放大器(U1)的正相输入端通过第五电阻(R5)和第二电阻(R2)组成的串联电路接地，所述第一运算放大器(U1)的反相输入端通过第六电阻(R6)和第三电阻(R3)组成的串联电路外接5V直流电压电源，所述第一运算放大器(U1)的反相输入端通过第六电阻(R6)和第四电阻(R4)组成的串联电路接地，所述第一运算放大器(U1)的正相输入端通过第七电阻(R7)与第一运算放大器(U1)的输出 端连接，所述第一运算放大器(U1)的输出端与第二运算放大器(U2)的正相输入端连接，所述第二运算放大器(U2)的反相输入端接地，所述第二运算放大器(U2)的正相输入端与第二运算放大器(U2)的输出端连接。a flow detection module is disposed in the central control device, the flow sensor (3) is electrically connected to the flow detection module, the flow detection module includes a flow detection circuit, and the flow detection circuit includes a first operational amplifier (U1), a second operational amplifier (U2), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), and a seventh resistor (R7), the non-inverting input terminal of the first operational amplifier (U1) is externally connected to a 5V DC voltage power supply through a series circuit composed of a fifth resistor (R5) and a first resistor (R1), the first operation The non-inverting input terminal of the amplifier (U1) is grounded through a series circuit composed of a fifth resistor (R5) and a second resistor (R2), and an inverting input terminal of the first operational amplifier (U1) passes through a sixth resistor (R6) The series circuit composed of the third resistor (R3) is externally connected with a 5V DC voltage source, and the inverting input terminal of the first operational amplifier (U1) is grounded through a series circuit composed of a sixth resistor (R6) and a fourth resistor (R4). The non-inverting input terminal of the first operational amplifier (U1) passes through the seventh resistor (R7) and the first operational amplifier (U1) Output Connected, the output of the first operational amplifier (U1) is connected to the non-inverting input of the second operational amplifier (U2), the inverting input of the second operational amplifier (U2) is grounded, the second The non-inverting input of the operational amplifier (U2) is coupled to the output of the second operational amplifier (U2).
- 如权利要求1所述的基于惠斯顿电桥测量原理的多级反渗透过滤系统，其特征在于，所述存储机构包括储水罐(6)。A multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle of claim 1 wherein said storage mechanism comprises a water storage tank (6).
- 如权利要求1所述的基于惠斯顿电桥测量原理的多级反渗透过滤系统，其特征在于，所述反渗透组件中设有反渗透膜。The multi-stage reverse osmosis filtration system based on the Wheatstone bridge measuring principle according to claim 1, wherein the reverse osmosis module is provided with a reverse osmosis membrane.
- 如权利要求1所述的基于惠斯顿电桥测量原理的多级反渗透过滤系统，其特征在于，所述中央控制装置为PLC。A multi-stage reverse osmosis filtration system based on the Wheatstone bridge measuring principle according to claim 1, wherein said central control unit is a PLC.
- 如权利要求1所述的基于惠斯顿电桥测量原理的多级反渗透过滤系统，其特征在于，所述中央控制装置中设有无线通讯模块，所述无线通讯模块通过WIFI传输无线信号。The multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle according to claim 1, wherein the central control device is provided with a wireless communication module, and the wireless communication module transmits a wireless signal through WIFI.
- 如权利要求1所述的基于惠斯顿电桥测量原理的多级反渗透过滤系统，其特征在于，所述第一电阻(R1)为可调电阻，所述第一电阻(R1)与流量传感器(3)电连接。The multi-stage reverse osmosis filtration system based on the Wheatstone bridge measuring principle according to claim 1, wherein the first resistor (R1) is an adjustable resistor, and the first resistor (R1) and the flow rate are The sensor (3) is electrically connected.
- 如权利要求1所述的基于惠斯顿电桥测量原理的多级反渗透过滤系统，其特征在于，所述第一运算放大器(U1)和第二运算放大器(U2)的型号均为LMV324。 The multi-stage reverse osmosis filtration system based on the Wheatstone bridge measurement principle according to claim 1, wherein the first operational amplifier (U1) and the second operational amplifier (U2) are both LMV324.
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