Water pump parameter calibration device

Abstract

The utility model provides a water pump parameter calibration device. The water pump parameter calibration device comprises a calibration unit; the detection unit is in communication connection with the calibration unit and used for obtaining calibration data, the detection unit comprises a processor and a parameter sampling module connected with the processor, and the tail end of the parameter sampling module is detachably connected with a parameter acquisition terminal. According to the water pump parameter calibration device provided by the invention, the detachable parameter acquisition terminal is arranged at the detection unit, and the acquired parameters are sent to the calibration unit for verification and then are returned to the detection unit for adjustment, so that some acquisition modules of the detection unit are selected or detached in different use scenes, and the calibration efficiency is improved. Therefore, the water pump parameter calibration device can meet the use requirements of different scenes.

Description

[0001] This application claims priority to Chinese patent application No. CN202320462180.X filed on March 7, 2023, and the entire contents of this application are incorporated herein by reference. Technical Field

[0002] The utility model relates to the technical field of water pumps, in particular to a water pump parameter calibration device. Background Art

[0003] Existing water pumps (such as shielded pumps) need to be calibrated after production to correct the software readings in the water pumps and ensure the normal reading of the water pump parameters. At present, the parameters required to be detected for different usage scenarios of water pumps are not the same, so the same model of water pumps often need to be equipped with different types of detection modules. Therefore, a water pump parameter calibration device that is compatible with different calibration parameter requirements is needed. Utility Model Content

[0004] The utility model provides a water pump parameter calibration device, which aims to be compatible with the needs of water pump parameter calibration in different usage scenarios.

[0005] The utility model provides a water pump parameter calibration device, comprising:

[0006] Calibration unit;

[0007] The detection unit is connected to the calibration unit for obtaining calibration data. The detection unit includes a processor and a parameter sampling module connected to the processor. The end of the parameter sampling module is detachably connected to the parameter acquisition terminal.

[0008] Optionally, the processor includes a processing chip and a peripheral circuit;

[0009] The peripheral circuit includes a first diode whose cathode is connected to the second pin of the processing chip, an anode of the first diode is connected to one end of a first resistor, and the other end of the first resistor is connected to a power supply;

[0010] The first pin of the processing chip is connected to one end of the second resistor;

[0011] The fifth pin of the processing chip is connected to a power source, one end of the first capacitor and one end of the second capacitor;

[0012] The fourth pin of the processing chip is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the other end of the first capacitor, the other end of the second capacitor, the other end of the second resistor and the ground wire;

[0013] The seventeenth pin of the processing chip is connected to the power supply, one end of the fourth capacitor and one end of the fifth capacitor; the other end of the fourth capacitor, the other end of the fifth capacitor and the sixteenth pin of the processing chip are connected to the ground line.

[0014] Optionally, the parameter sampling module includes a voltage detection subunit, a current detection subunit, a rotation speed detection subunit, a flow detection subunit, a lift detection subunit and a rotation speed detection subunit.

[0015] Optionally, the voltage detection subunit includes a voltage connector;

[0016] The voltage connector is connected to the input pin of the voltage sampling module, the first output pin of the voltage sampling module is connected to one end of the third resistor, the third resistor is connected in series with the fourth resistor, the fifth resistor, and the sixth resistor, and the sixth resistor is connected in parallel with the sixth capacitor; the end of the fifth resistor connected to the sixth resistor is connected to the seventh pin of the processing chip;

[0017] The second output pin of the voltage sampling module is connected to the ground line.

[0018] Optionally, the current detection subunit includes a current sampling chip and a seventh resistor, a seventh capacitor and an eighth capacitor;

[0019] The seventh resistor is connected between the first pin and the eighth pin of the current sampling chip;

[0020] The second pin, the fourth pin and the seventh pin of the current sampling chip are connected to the ground wire; the third pin and the sixth pin of the current sampling chip are connected to the power supply;

[0021] The power supply is connected to one end of the seventh capacitor and one end of the eighth capacitor; the other end of the seventh capacitor, the other end of the eighth capacitor, and the second pin, the fourth pin, and the seventh pin of the current sampling chip are connected to the ground wire;

[0022] The fifth pin of the current sampling chip is connected to the twentieth pin of the processing chip.

[0023] Optionally, the speed detection subunit includes a speed connector;

[0024] The speed connector is provided with a three-phase interface, wherein the first phase interface is connected to one end of the eighth resistor, the second phase interface is connected to one end of the ninth resistor, and the third phase interface is connected to the tenth resistor;

[0025] The other ends of the eighth resistor, the ninth resistor and the tenth resistor are connected to one end of the ninth capacitor, one end of the eleventh resistor, the first pin of the transient suppression diode and the sixth pin of the processing chip;

[0026] The other end of the eleventh resistor is connected to the power supply, and the other end of the ninth capacitor is connected to the ground wire;

[0027] The second pin of the transient suppression diode is connected to the power supply, and the third pin of the transient suppression diode is connected to the ground.

[0028] Optionally, the lift detection subunit includes a water pressure detection chip;

[0029] The first pin of the water pressure detection chip is connected to one end of the twelfth resistor and the eighth pin of the processing chip, and the other end of the twelfth resistor is connected to the power supply;

[0030] The second pin and the third pin of the water pressure detection chip are connected to one end of the thirteenth resistor and the ninth pin of the processing chip; the other end of the thirteenth resistor is connected to the ground wire;

[0031] The fourth pin of the water pressure detection chip is connected to the tenth pin of the processing chip;

[0032] The fifth pin of the water pressure detection chip is connected to the ground wire;

[0033] The sixth pin of the water pressure detection chip is connected to one end of the fifteenth resistor, the seventh pin of the water pressure detection chip is connected to one end of the fourteenth resistor, and the other ends of the fifteenth resistor and the fourteenth resistor are connected to the water pressure sensor;

[0034] The eighth pin of the water pressure detection chip is connected to the power supply and one end of the tenth capacitor, and the other end of the tenth capacitor is connected to the ground wire.

[0035] Optionally, the flow detection subunit includes a flow detection chip;

[0036] The first pin of the flow detection chip is connected to one end of the sixteenth resistor and the eleventh pin of the processing chip, and the other end of the sixteenth resistor is connected to the power supply;

[0037] The second pin and the third pin of the flow detection chip are connected to one end of the seventeenth resistor and the twelfth pin of the processing chip, and the other end of the seventeenth resistor is connected to the ground wire;

[0038] The fourth pin of the flow detection chip is connected to the thirteenth pin of the processing chip;

[0039] The fifth pin of the flow detection chip is connected to the ground wire;

[0040] The sixth pin of the flow detection chip is connected to one end of the nineteenth resistor, the seventh pin of the flow detection chip is connected to one end of the eighteenth resistor, and the other ends of the nineteenth resistor and the eighteenth resistor are connected to the flow sensor;

[0041] The eighth pin of the flow detection chip is connected to the power supply and one end of the eleventh capacitor, and the other end of the eleventh capacitor is connected to the ground wire.

[0042] The present application provides a water pump parameter calibration device, which is equipped with a detachable parameter acquisition terminal at the detection unit, and sends the collected parameters to the calibration unit for verification, and then returns them to the detection unit for adjustment, thereby selecting or disassembling certain acquisition modules of the detection unit in different usage scenarios, thereby facilitating the water pump parameter calibration device to meet the usage needs of different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of the structure of a water pump parameter calibration device provided by an embodiment of the utility model;

[0044] Figure 2 A circuit schematic diagram of a processor in a water pump parameter calibration device provided by an embodiment of the utility model;

[0045] Figure 3 A circuit schematic diagram of a voltage detection subunit in a water pump parameter calibration device provided by an embodiment of the utility model;

[0046] Figure 4 A circuit schematic diagram of a current detection subunit in a water pump parameter calibration device provided by an embodiment of the utility model;

[0047] Figure 5 A circuit schematic diagram of a speed detection subunit in a water pump parameter calibration device provided by an embodiment of the utility model;

[0048] Figure 6 A circuit schematic diagram of a head detection subunit in a water pump parameter calibration device provided by an embodiment of the utility model;

[0049] Figure 7 A circuit schematic diagram of a flow detection subunit in a water pump parameter calibration device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0051] At present, the parameters that need to be detected in different usage scenarios of water pumps are not the same, which often leads to the need to configure different types of detection modules for the same model of water pumps. Therefore, a water pump parameter calibration device that is compatible with different calibration parameter requirements is needed.

[0052] Embodiment 1

[0053] In view of the above shortcomings, the utility model provides a water pump parameter calibration device, such as Figure 1 As shown, including:

[0054] Calibration unit; including but not limited to handheld terminals, computers and other equipment. The calibration unit is set with the benchmark reference value of the parameter. The calibration method can be a simple comparison or a calibration coefficient that needs to be adjusted by calculating the comparison.

[0055] The detection unit is connected to the calibration unit for obtaining calibration data. The detection unit includes a processor and a parameter sampling module connected to the processor. The end of the parameter sampling module is detachably connected to the parameter acquisition terminal. The detection unit and the calibration unit can be connected by wire and / or wireless, depending on the specific use environment. For example, if the use scenario is far away, a wireless method is preferably used.

[0056] The parameter sampling module can sample various parameters of the water pump and calibrate the corresponding parameters according to the requirements of specific usage scenarios. In order to achieve this function, the parameter sampling module is equipped with multiple parameter detection subunits, such as voltage detection subunit, current detection subunit, speed detection subunit, flow detection subunit, head detection subunit and speed detection subunit. In addition, the above subunits are connected to their respective parameter acquisition terminals through connectors, and parameter selection can be achieved by plugging and unplugging.

[0057] The present application provides a water pump parameter calibration device, which is equipped with a detachable parameter acquisition terminal at the detection unit, and sends the collected parameters to the calibration unit for verification, and then returns them to the detection unit for adjustment, thereby selecting or disassembling certain acquisition modules of the detection unit in different usage scenarios, thereby facilitating the water pump parameter calibration device to meet the usage needs of different scenarios.

[0058] Embodiment 2

[0059] This embodiment further refines the above technical solution. Figure 2 As shown, the processor in the above-mentioned water pump parameter calibration device includes a processing chip U1 (model GD32E230G6U7) and peripheral circuits;

[0060] The peripheral circuit includes a first diode D1 whose cathode is connected to the second pin of the processing chip U1, whose anode is connected to one end of the first resistor R1, and whose other end is connected to the power supply 3.3V; the first diode D1 is a light emitting diode for indicating the working status of the processing chip U1.

[0061] The first pin of the processing chip U1 is connected to one end of the second resistor R2, and the boot source of the processing chip U1 is determined by the level value of the first pin, which is designed to be a low level signal 0 at this time, and the main FLASH memory is selected;

[0062] The fifth pin of the processing chip U1 is a power pin, which is connected to the power supply 3.3V, one end of the first capacitor C1 and one end of the second capacitor C2. The function of the two capacitors is filtering.

[0063] The fourth pin of the processing chip U1 is an external reset pin, connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is simultaneously connected to the other end of the first capacitor C1, the other end of the second capacitor C2, the other end of the second resistor R2 and the ground line GND;

[0064] The seventeenth pin of the processing chip U1 is a power pin, and is connected to the power supply 3.3V, one end of the fourth capacitor C4, and one end of the fifth capacitor C5; the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, and the sixteenth pin of the processing chip U1 (reference ground of U1) are connected to the ground wire GND. The processing chip U1 connects different sub-units through corresponding pins to realize parameter collection, and sends the collected parameters to the calibration unit.

[0065] It should be added here that the processing chip U1 is equipped with a clock interface CLK to connect to the connector CN1 of the external clock. The connector CN1 is also provided with an IO port for program burning, which is used to connect to the twenty-first pin of the processing chip U1 for program burning.

[0066] And if Figure 3 As shown, the voltage detection subunit includes a voltage connector P1, and the voltage connector P1 is connected to the input voltage of the water pump;

[0067] The voltage connector P1 is connected to the input pin of the voltage sampling module U2. The DC voltage outputted by the first output pin of the voltage sampling module U2 after rectification is connected to one end of the third resistor R3. The third resistor R3 is connected in series with the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6. The sixth resistor R6 is connected in parallel with the sixth capacitor C6. One end VDC where the fifth resistor R5 and the sixth resistor R6 are connected is connected to the seventh pin (voltage sampling) of the processing chip U1. The third resistor R3 to the fifth resistor R5 are used for voltage reduction. The sixth resistor R6 is connected in parallel with the sixth capacitor C6 for filtering.

[0068] The second output pin (reference ground of the rectified output) of the voltage sampling module U2 is connected to the ground wire GND. The function of the voltage sampling module U2 includes rectifying and filtering the input voltage loaded on the water pump.

[0069] like Figure 4As shown, the current detection subunit includes a current sampling chip U3 (model INA282AQDRQ1) and a seventh resistor R7, a seventh capacitor C7 and an eighth capacitor C8;

[0070] The seventh resistor R7 is connected between the first pin (current sampling negative electrode) and the eighth pin (current sampling positive electrode) of the current sampling chip U3;

[0071] The second pin (chip ground) and the fourth pin of the current sampling chip U3 are grounded, and the seventh pin (reference voltage 0V) is connected to the ground line GND; the third pin (reference voltage 3.3V) and the sixth pin (chip power input) of the current sampling chip U3 are connected to the power supply 3.3V;

[0072] The power supply 3.3V is connected to one end of the seventh capacitor C7 and one end of the eighth capacitor C8; the other end of the seventh capacitor C7, the other end of the eighth capacitor C8 and the second pin, the fourth pin and the seventh pin of the current sampling chip U3 are connected to the ground line GND;

[0073] The fifth pin (sampling input pin) of the current sampling chip U3 is connected to the twentieth pin (for receiving the current sampling value) of the processing chip U1. It should be added that the current detection subunit and the voltage detection subunit share the voltage connector P1, and the seventh resistor R7 is used to convert the current into current for sampling.

[0074] like Figure 5 As shown, the speed detection subunit includes a speed connector P2;

[0075] The speed connector P2 is provided with a three-phase interface, wherein the first phase interface FBK W is connected to one end of the eighth resistor R8, the second phase interface FBK V is connected to one end of the ninth resistor R9, and the third phase interface FBK U is connected to the tenth resistor R10; the speed detection subunit is used to detect the current value of the three-phase current when the water pump is working;

[0076] The other ends of the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are connected to one end of the ninth capacitor C9, one end of the eleventh resistor R11, the first pin of the transient suppression diode D2 and the sixth pin of the processing chip U1;

[0077] The other end of the eleventh resistor R11 is connected to the power supply 3.3V, and the other end of the ninth capacitor C9 is connected to the ground line GND;

[0078] The second pin of the transient suppression diode D2 is connected to the power supply 3.3V, and the first pin of the transient suppression diode D2 is connected to the ground line GND. The function of the transient suppression diode D2 is to prevent the current impact on the processing chip U1.

[0079] like Figure 6As shown, the lift detection subunit includes a water pressure detection chip U4;

[0080] The water pressure detection chip U4, model number is SP3485, the first pin (transceiver output) of which is connected to one end of the twelfth resistor R12 and the eighth pin HRXD (H represents head) of the processing chip U1, and the other end of the twelfth resistor R12 is connected to the power supply 3.3V;

[0081] The second pin and the third pin (both are enable pins) of the water pressure detection chip U4 are connected to one end of the thirteenth resistor R13 and the ninth pin HDIR (the transmit and receive enable pin for controlling U1) of the processing chip U1; the other end of the thirteenth resistor R13 is connected to the ground wire GND; the function of the water pressure detection chip U4 is to detect the lift of the water pump;

[0082] The fourth pin (transceiver input pin) of the water pressure detection chip U4 is connected to the tenth pin HTXD of the processing chip U1;

[0083] The fifth pin (chip ground pin) of the water pressure detection chip U4 is connected to the ground wire GND;

[0084] The sixth pin of the water pressure detection chip U4 is connected to one end of the fifteenth resistor R15, the seventh pin of the water pressure detection chip U4 is connected to one end of the fourteenth resistor R14, and the other ends of the fifteenth resistor R15 and the fourteenth resistor R14 are connected to the water pressure sensor P3; the function of the sixth pin and the seventh pin is to receive the feedback signal of the water pressure sensor P3.

[0085] The eighth pin (chip power pin) of the water pressure detection chip U4 is connected to the power supply 3.3V and one end of the tenth capacitor C10, and the other end of the tenth capacitor C10 is connected to the ground line GND.

[0086] like Figure 7 As shown, the flow detection subunit includes a flow detection chip U5, model number SP3485, wherein the first pin is connected to one end of the sixteenth resistor R16 and the eleventh pin QRXD of the processing chip U1, and the other end of the sixteenth resistor R16 is connected to the power supply 3.3V;

[0087] The second pin and the third pin of the flow detection chip U5 are connected to one end of the seventeenth resistor R17 and the twelfth pin QDIO of the processing chip U1, and the other end of the seventeenth resistor R17 is connected to the ground wire GND;

[0088] The fourth pin of the flow detection chip U5 is connected to the thirteenth pin QTXD of the processing chip U1;

[0089] The fifth pin of the flow detection chip U5 is connected to the ground wire GND;

[0090] The sixth pin of the flow detection chip U5 is connected to one end of the nineteenth resistor R19, the seventh pin of the flow detection chip U5 is connected to one end of the eighteenth resistor R18, and the other ends of the nineteenth resistor R19 and the eighteenth resistor R18 are connected to the flow sensor P4;

[0091] The eighth pin of the flow detection chip U5 is connected to the power supply 3.3V and one end of the eleventh capacitor C11, and the other end of the eleventh capacitor C11 is connected to the ground line GND.

[0092] It should be added here that after the aforementioned chip collects the corresponding water pump parameters, the processor sends them to the calibration unit and receives the calibration coefficients fed back by the calibration unit. After that, the processor sends the calibration data to the water pump and repeats the aforementioned correction process to verify the accuracy of the correction.

[0093] The solution provided in the embodiment of the utility model adopts the water pump parameter reading device provided in the aforementioned embodiment, adopts the same technical means, and achieves the same technical effect, which will not be repeated here.

[0094] Some directional words are defined in the present utility model. Unless otherwise specified, the directional words used, such as "up", "down", "left", "right", "inside" and "outside", are used for ease of understanding and therefore do not constitute limitations on the protection scope of the present utility model.

[0095] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0096] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A water pump parameter calibration device, characterized in that: include: Calibration unit; The detection unit is connected to the calibration unit for obtaining calibration data. The detection unit includes a processor and a parameter sampling module connected to the processor. The end of the parameter sampling module is detachably connected to the parameter acquisition terminal.

2. The water pump parameter calibration device according to claim 1, characterized in that: The processor includes a processing chip and a peripheral circuit; The peripheral circuit includes a first diode whose cathode is connected to the second pin of the processing chip, an anode of the first diode is connected to one end of a first resistor, and the other end of the first resistor is connected to a power supply; The first pin of the processing chip is connected to one end of the second resistor; The fifth pin of the processing chip is connected to the power supply, one end of the first capacitor and one end of the second capacitor; The fourth pin of the processing chip is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the other end of the first capacitor, the other end of the second capacitor, the other end of the second resistor and the ground line; The seventeenth pin of the processing chip is connected to the power supply, one end of the fourth capacitor and one end of the fifth capacitor; the other end of the fourth capacitor, the other end of the fifth capacitor and the sixteenth pin of the processing chip are connected to the ground line.

3. The water pump parameter calibration device according to claim 2, characterized in that: The parameter sampling module includes a voltage detection subunit, a current detection subunit, a rotation speed detection subunit, a flow detection subunit, a lift detection subunit and a rotation speed detection subunit.

4. The water pump parameter calibration device according to claim 3, characterized in that: The voltage detection subunit includes a voltage connector; The voltage connector is connected to the input pin of the voltage sampling module, the first output pin of the voltage sampling module is connected to one end of the third resistor, the third resistor is connected in series with the fourth resistor, the fifth resistor and the sixth resistor, the sixth resistor is connected in parallel with the sixth capacitor; the end of the fifth resistor connected to the sixth resistor is connected to the seventh pin of the processing chip; The second output pin of the voltage sampling module is connected to the ground line.

5. The water pump parameter calibration device according to claim 3, characterized in that: The current detection subunit includes a current sampling chip and a seventh resistor, a seventh capacitor and an eighth capacitor; The seventh resistor is connected between the first pin and the eighth pin of the current sampling chip; The second pin, the fourth pin and the seventh pin of the current sampling chip are connected to the ground line; the third pin and the sixth pin of the current sampling chip are connected to the power supply; The power supply is connected to one end of the seventh capacitor and one end of the eighth capacitor; the other end of the seventh capacitor, the other end of the eighth capacitor, and the second pin, the fourth pin, and the seventh pin of the current sampling chip are connected to the ground wire; The fifth pin of the current sampling chip is connected to the twentieth pin of the processing chip.

6. The water pump parameter calibration device according to claim 3, characterized in that: The speed detection subunit includes a speed connector; The speed connector is provided with a three-phase interface, wherein the first phase interface is connected to one end of the eighth resistor, the second phase interface is connected to one end of the ninth resistor, and the third phase interface is connected to the tenth resistor; The other ends of the eighth resistor, the ninth resistor and the tenth resistor are connected to one end of the ninth capacitor, one end of the eleventh resistor, the first pin of the transient suppression diode and the sixth pin of the processing chip; The other end of the eleventh resistor is connected to the power supply, and the other end of the ninth capacitor is connected to the ground line; The second pin of the transient suppression diode is connected to the power supply, and the third pin of the transient suppression diode is connected to the ground line.

7. The water pump parameter calibration device according to claim 3, characterized in that: The lift detection subunit includes a water pressure detection chip; The first pin of the water pressure detection chip is connected to one end of a twelfth resistor and the eighth pin of the processing chip, and the other end of the twelfth resistor is connected to the power supply; The second pin and the third pin of the water pressure detection chip are connected to one end of the thirteenth resistor and the ninth pin of the processing chip; the other end of the thirteenth resistor is connected to the ground wire; The fourth pin of the water pressure detection chip is connected to the tenth pin of the processing chip; The fifth pin of the water pressure detection chip is connected to the ground wire; The sixth pin of the water pressure detection chip is connected to one end of the fifteenth resistor, the seventh pin of the water pressure detection chip is connected to one end of the fourteenth resistor, and the other ends of the fifteenth resistor and the fourteenth resistor are connected to the water pressure sensor; The eighth pin of the water pressure detection chip is connected to the power supply and one end of the tenth capacitor, and the other end of the tenth capacitor is connected to the ground wire.

8. The water pump parameter calibration device according to claim 3, characterized in that: The flow detection subunit includes a flow detection chip; The first pin of the flow detection chip is connected to one end of a sixteenth resistor and the eleventh pin of the processing chip, and the other end of the sixteenth resistor is connected to the power supply; The second pin and the third pin of the flow detection chip are connected to one end of the seventeenth resistor and the twelfth pin of the processing chip, and the other end of the seventeenth resistor is connected to the ground wire; The fourth pin of the flow detection chip is connected to the thirteenth pin of the processing chip; The fifth pin of the flow detection chip is connected to the ground wire; The sixth pin of the flow detection chip is connected to one end of the nineteenth resistor, the seventh pin of the flow detection chip is connected to one end of the eighteenth resistor, and the other ends of the nineteenth resistor and the eighteenth resistor are connected to the flow sensor; The eighth pin of the flow detection chip is connected to the power supply and one end of the eleventh capacitor, and the other end of the eleventh capacitor is connected to the ground wire.

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