Fatigue recording self-diagnosis alarm circuit for liquid turbine flowmeter

Abstract

The utility model belongs to the technical field of measurement, and relates to a liquid turbine flowmeter fatigue recording self-diagnosis alarm circuit, which comprises an impeller rotation acquisition circuit, a proximity switch acquisition circuit, a reset determination circuit, a CPU, an alarm output circuit and a data memory, and is characterized in that the CPU receives impeller rotation output by the impeller rotation acquisition circuit and sends the impeller rotation to the data memory for storage; meanwhile, the CPU calculates and judges the impeller rotation number and controls the alarm output circuit to indicate the current impeller fatigue state; the CPU monitors the output of the proximity switch acquisition circuit module in real time and extracts a disassembly and maintenance signal of the proximity switch sensor; after a disassembly signal of the proximity switch sensor is read, if a reset determination circuit signal is collected, the impeller rotation number is reset, and otherwise, counting is continued; therefore, fatigue recording of the liquid turbine flowmeter is achieved, and automatic diagnosis and alarm output are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement, and in particular relates to a fatigue recording self-diagnosis alarm circuit for a liquid turbine flowmeter. Background Art

[0002] A liquid turbine flowmeter is a velocity flowmeter primarily composed of a turbine, a flow guide, and a magnetoelectric induction converter. Its operating principle is that when the measured liquid flows through the sensor, it drives the turbine to rotate, and the turbine speed is proportional to the liquid flow rate. A signal detector converts the turbine speed into an electrical pulse signal, which is amplified by an amplifier and then sent to a display instrument for display and accumulation.

[0003] Liquid turbine flowmeters have the advantages of high precision, good repeatability, wide measurement range, and fast response speed. They are widely used in industrial fields such as petroleum, chemical, metallurgy, food, and pharmaceutical industries to measure and control the flow of various liquid media. However, they also have some limitations. The fundamental measurement principle of liquid turbine flowmeters lies in the balance between the thrust generated by the flow of liquid medium on the impeller and the friction between the impeller shaft and the sleeve. When the impeller and shaft and other parts are worn due to long-term rotation, the thrust that pushes the impeller and the friction between the impeller shaft and the sleeve will change at the same flow rate, resulting in a decrease in measurement accuracy. At this time, the flowmeter needs to be recalibrated, or parts need to be replaced and calibrated again.

[0004] Therefore, to ensure that the liquid turbine flowmeter can accurately measure, it is necessary to record the degree of impeller fatigue and automatically determine and issue an alarm in a timely manner. However, current liquid turbine flowmeters only measure flow under normal conditions and do not provide a diagnostic alarm for fatigue. Therefore, a method and functional circuit that can automatically detect and diagnose impeller fatigue and issue an alarm is urgently needed. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a fatigue recording self-diagnosis alarm circuit for a liquid turbine flowmeter.

[0006] In order to achieve the purpose of the utility model, the utility model will be implemented by adopting the following technical solutions.

[0007] A fatigue recording self-diagnosis alarm circuit for a liquid turbine flowmeter includes an impeller rotation acquisition circuit, a proximity switch acquisition circuit, a reset determination circuit, a CPU, an alarm output circuit, and a data storage device, wherein:

[0008] The impeller rotation acquisition circuit is responsible for collecting the output signal of the signal detector of the liquid turbine flowmeter, amplifying and shaping it into a standard square wave and inputting it into the CPU;

[0009] The proximity switch acquisition circuit converts the switch signal output by the proximity switch sensor into a pulse signal through an optical coupler and inputs the pulse signal into the CPU;

[0010] The reset determination circuit is used to receive a reset determination signal input through a key, and input the reset determination signal into the CPU;

[0011] The CPU receives a standard square wave from the impeller rotation acquisition circuit, converts the standard square wave into the impeller rotation number through calculation, and stores the statistical impeller rotation number in a data memory. At the same time, the impeller rotation number is used to control the alarm output circuit to indicate the current fatigue state of the impeller;

[0012] The CPU monitors the proximity switch sensor in real time by receiving a pulse signal from the proximity switch acquisition circuit to obtain the state of the proximity switch sensor to determine whether the liquid turbine flowmeter is in a normal working state or in a disassembled maintenance state.

[0013] As a preferred solution of the present utility model, the two input terminals of the impeller rotation acquisition circuit are respectively the two output terminals SIG_A and SIG_B of the signal detector;

[0014] The impeller rotation acquisition circuit is composed of resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C1, operational amplifier U1, operational amplifier U2; wherein:

[0015] The output terminal SIG_A is connected to the inverting input terminal 4 of the operational amplifier U1 through the resistor R2, the output terminal 1 of the operational amplifier U1 is connected to the inverting input terminal 4 of the operational amplifier U2, and the output terminal 1 of the operational amplifier U2 is connected to the pin CPU IO 1 of the CPU;

[0016] One end of the parallel circuit consisting of resistor R3 and capacitor C1 is connected to the connection line between resistor R2 and inverting input terminal 4 of operational amplifier U1, and the other end is connected to the connection line between output terminal 1 of operational amplifier U1 and inverting input terminal 4 of operational amplifier U2;

[0017] Pin 5 of the operational amplifier U1 is connected to the power supply VCC;

[0018] The output terminal SIG_B, the non-inverting input terminal 3 of the operational amplifier U1 and the pin 2 of the operational amplifier U1 are connected to GND respectively;

[0019] The output terminal SIG_A is connected to GND via a resistor R1;

[0020] The non-inverting input terminal 3 of the operational amplifier U2 is connected to GND via a resistor R4;

[0021] The non-inverting input terminal 3 of the operational amplifier U2 is connected to the power supply VCC through the resistor R5;

[0022] The non-inverting input terminal 3 of the operational amplifier U2 is connected to the CPU IO 1 pin of the CPU through the resistor R6;

[0023] Pin 3 of the operational amplifier U2 is connected to GND;

[0024] Pin 5 of the operational amplifier U2 is connected to the power supply VCC.

[0025] As a further solution of the present invention, the two output terminals SIG_A and SIG_B of the signal detector are respectively two ends of an inductor coil with 1000 to 2000 turns surrounding a permanent magnetic steel.

[0026] As a preferred solution of the present invention, the two input terminals of the proximity switch acquisition circuit are the output terminals SWITCH_OUT and SWITCH_GND of the proximity switch sensor respectively;

[0027] The proximity switch acquisition circuit is composed of an optocoupler U3 and a resistor R7; wherein:

[0028] The output terminal SWITCH_OUT of the proximity switch sensor is connected to the positive electrode of the input terminal of the optocoupler U3;

[0029] The output terminal SWITCH_GND of the proximity switch sensor is connected to the negative electrode of the input terminal of the optocoupler U3;

[0030] The emitter of the output end of the optical coupler U3 is grounded, and the collector thereof is connected to the power supply VCC via the resistor R7;

[0031] The collector is also connected to the pin CPU_IO_2 of the CPU.

[0032] As a preferred solution of the present invention, the reset determination circuit is composed of a key KEY1 and a resistor R8; wherein:

[0033] Pin 1 of the key KEY is grounded;

[0034] Pin 2 of the key KEY is connected to the power supply VCC through a resistor R8;

[0035] Pin 2 of the key KEY is also connected to pin CPU_IO_3 of the CPU.

[0036] As a preferred solution of the present utility model, the alarm output circuit is composed of a resistor R12, a light-emitting diode LED1, a light-emitting diode LED2, a light-emitting diode LED3, and a light-emitting diode LED4; wherein:

[0037] One end of the resistor R12 is connected to the CPU pins CPU_IO_10, CPU_IO_9, CPU_IO_8 and CPU_IO_7 through the light emitting diode LED1, the light emitting diode LED2, the light emitting diode LED3 and the light emitting diode LED4 respectively;

[0038] The other end of the resistor R12 is connected to the power supply VCC.

[0039] As a preferred solution of the present utility model, the data memory is composed of a ferroelectric memory U4, a resistor R9, a resistor R10, and a resistor R11;

[0040] Pins 1, 2, 3 and 4 of the ferroelectric memory U4 are grounded;

[0041] Pin 8 of the ferroelectric memory U4 is connected to the power supply VCC;

[0042] Pin 5 of the ferroelectric memory U4 is connected to pin CPU_IO_6 of the CPU and is connected to the power supply VCC through a resistor R11;

[0043] Pin 6 of the ferroelectric memory U4 is connected to the CPU_IO_5 pin of the CPU and is connected to the power supply VCC through the resistor R10;

[0044] Pin 7 of the ferroelectric memory U4 is connected to pin CPU_IO_4 of the CPU, and is connected to a power source VCC via a resistor R9.

[0045] As a preferred solution of the present invention, the CPU is a microcontroller, wherein:

[0046] The CPU pins CPU_IO_1, CPU_IO_2 and CPU_IO_3 are selected as input functions;

[0047] The CPU pins CPU_IO_4, CPU_IO_5, CPU_IO_6, CPU_IO_7, CPU_IO_8, CPU_IO_9, and CPU_IO_10 are selected as output functions.

[0048] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0049] The utility model can record all impeller revolutions after the sensor is assembled by counting and storing the impeller revolutions, determine the fatigue degree of the liquid turbine flowmeter by the revolutions, and automatically determine the output alarm indication; at the same time, by monitoring the proximity switch, it can automatically determine whether the sensor is disassembled or maintained, and restart the impeller revolution counting by resetting to ensure the validity of the impeller revolution statistics; thereby solving the problem of automatic diagnosis and alarm indication of turbine flowmeter impeller fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a structural block diagram of a fatigue recording self-diagnosis alarm circuit of a liquid turbine flowmeter described in the utility model;

[0051] Figure 2 It is a schematic diagram of the impeller rotation collection circuit of the utility model;

[0052] Figure 3 It is a schematic diagram of the proximity switch acquisition circuit of the utility model;

[0053] Figure 4 It is a schematic diagram of the reset determination circuit of the utility model;

[0054] Figure 5 It is a schematic diagram of the alarm output circuit of the utility model;

[0055] Figure 6 It is a schematic diagram of the data storage device of the present utility model. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0057] As an embodiment of the present utility model, Figure 1 As shown, a fatigue recording self-diagnosis alarm circuit for a liquid turbine flowmeter includes an impeller rotation acquisition circuit, a proximity switch acquisition circuit, a reset determination circuit, a CPU, an alarm output circuit, and a data storage device, wherein:

[0058] The impeller rotation acquisition circuit is responsible for collecting the output signal of the signal detector of the liquid turbine flowmeter, amplifying and shaping it into a standard square wave and inputting it into the CPU;

[0059] The proximity switch acquisition circuit converts the switch signal output by the proximity switch sensor into a pulse signal through an optical coupler and inputs the pulse signal into the CPU;

[0060] The reset determination circuit is used to receive a reset determination signal input through a key, and input the reset determination signal into the CPU;

[0061] The CPU receives a standard square wave from the impeller rotation acquisition circuit, converts the standard square wave into the impeller rotation number through calculation, and stores the statistical impeller rotation number in a data memory. At the same time, the impeller rotation number is used to control the alarm output circuit to indicate the current fatigue state of the impeller;

[0062] The CPU monitors the proximity switch sensor in real time by receiving a pulse signal from the proximity switch acquisition circuit to obtain the state of the proximity switch sensor to determine whether the liquid turbine flowmeter is in a normal working state or in a disassembled maintenance state.

[0063] As an embodiment of the present utility model, Figure 2 As shown, the two input terminals of the impeller rotation acquisition circuit are the two output terminals SIG_A and SIG_B of the signal detector respectively;

[0064] The impeller rotation acquisition circuit is composed of resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C1, operational amplifier U1, operational amplifier U2; wherein:

[0065] The output terminal SIG_A is connected to the inverting input terminal 4 of the operational amplifier U1 through the resistor R2, the output terminal 1 of the operational amplifier U1 is connected to the inverting input terminal 4 of the operational amplifier U2, and the output terminal 1 of the operational amplifier U2 is connected to the pin CPU IO 1 of the CPU;

[0066] One end of the parallel circuit consisting of resistor R3 and capacitor C1 is connected to the connection line between resistor R2 and inverting input terminal 4 of operational amplifier U1, and the other end is connected to the connection line between output terminal 1 of operational amplifier U1 and inverting input terminal 4 of operational amplifier U2;

[0067] Pin 5 of the operational amplifier U1 is connected to the power supply VCC;

[0068] The output terminal SIG_B, the non-inverting input terminal 3 of the operational amplifier U1 and the pin 2 of the operational amplifier U1 are connected to GND respectively;

[0069] The output terminal SIG_A is connected to GND via a resistor R1;

[0070] The non-inverting input terminal 3 of the operational amplifier U2 is connected to GND via a resistor R4;

[0071] The non-inverting input terminal 3 of the operational amplifier U2 is connected to the power supply VCC through the resistor R5;

[0072] The non-inverting input terminal 3 of the operational amplifier U2 is connected to the CPU IO 1 pin of the CPU through the resistor R6;

[0073] Pin 3 of the operational amplifier U2 is connected to GND;

[0074] Pin 5 of the operational amplifier U2 is connected to the power supply VCC.

[0075] The impeller rotation acquisition circuit amplifies and shapes the output signal of the signal detector of the turbine flowmeter to form a standard square wave, which is input into the CPU to count the number of impeller revolutions.

[0076] As an embodiment of the present invention, the signal detector is generally composed of a 1000-2000 turn inductor coil surrounding a permanent magnetic steel, and the two output terminals SIG_A and SIG_B of the signal detector are respectively the two ends of the 1000-2000 turn inductor coil surrounding a permanent magnetic steel.

[0077] As an embodiment of the present utility model, Figure 3 As shown, the two input terminals of the proximity switch acquisition circuit are the output terminals SWITCH_OUT and SWITCH_GND of the proximity switch sensor respectively;

[0078] The proximity switch acquisition circuit is composed of an optocoupler U3 and a resistor R7; wherein:

[0079] The output terminal SWITCH_OUT of the proximity switch sensor is connected to the positive electrode of the input terminal of the optocoupler U3;

[0080] The output terminal SWITCH_GND of the proximity switch sensor is connected to the negative electrode of the input terminal of the optocoupler U3;

[0081] The emitter of the output end of the optical coupler U3 is grounded, and the collector thereof is connected to the power supply VCC via the resistor R7;

[0082] The collector is also connected to the pin CPU_IO_2 of the CPU.

[0083] The proximity switch acquisition circuit converts the switch signal output by the proximity switch sensor into a pulse signal that can be received by the CPU through an optical coupler. The CPU monitors the state of the proximity switch in real time to determine whether the turbine flowmeter is in normal working condition or disassembled for maintenance.

[0084] As an embodiment of the present utility model, Figure 4 As shown, the reset determination circuit is composed of a key KEY1 and a resistor R8; wherein:

[0085] Pin 1 of the key KEY is grounded;

[0086] The pin 2 of the key KEY is connected with the power supply VCC through the resistance R8;

[0087] The pin 2 of the key KEY is also connected with the pin CPU_IO_3 of the CPU.

[0088] The reset determining circuit inputs the reset determining signal through the key, is collected by the CPU module, and determines whether to clear and re-count the impeller rotation number.

[0089] As an embodiment of the utility model, as shown in Figure 5 The alarm output circuit is composed of the resistance R12, the light emitting diode LED1, the light emitting diode LED2, the light emitting diode LED3 and the light emitting diode LED4;Among them:

[0090] One end of the resistance R12 is connected with the pin CPU_IO_10, CPU_IO_9, CPU_IO_8 and CPU_IO_7 of the CPU through the light emitting diode LED1, the light emitting diode LED2, the light emitting diode LED3 and the light emitting diode LED4 respectively;

[0091] The other end of the resistance R12 is connected with the power supply VCC.

[0092] The alarm output circuit is controlled by the CPU to determine the fatigue degree of the turbine flowmeter through the light and dark of the light emitting diode.

[0093] As an embodiment of the utility model, as shown in Figure 6 The data storage is composed of the ferroelectric memory U4, the resistance R9, the resistance R10 and the resistance R11;

[0094] The pins 1, 2, 3 and 4 of the ferroelectric memory U4 are grounded;

[0095] The pin 8 of the ferroelectric memory U4 is connected with the power supply VCC;

[0096] The pin 5 of the ferroelectric memory U4 is connected with the pin CPU_IO_6 of the CPU and is connected with the power supply VCC through the resistance R11;

[0097] The pin 6 of the ferroelectric memory U4 is connected with the pin CPU_IO_5 of the CPU and is connected with the power supply VCC through the resistance R10;

[0098] The pin 7 of the ferroelectric memory U4 is connected with the pin CPU_IO_4 of the CPU and is connected with the power supply VCC through the resistance R9.

[0099] The data storage is a ferroelectric memory, capable of realizing no loss in power failure, such as FM24CL02 model of Cypress company.

[0100] The CPU module stores the counted impeller revolutions into the ferroelectric memory, so that even if power failure occurs, the revolutions can be continued to be counted on the basis of the original, avoiding the problem of counting error of the impeller revolutions in power failure.

[0101] As an embodiment of the utility model, the CPU is a microcontroller, wherein:

[0102] The pins CPU_IO_1, CPU_IO_2 and CPU_IO_3 of the CPU are selected as input functions;

[0103] The pins CPU_IO_4, CPU_IO_5, CPU_IO_6, CPU_IO_7, CPU_IO_8, CPU_IO_9 and CPU_IO_10 of the CPU are selected as output functions.

[0104] Working principle: the CPU module receives the impeller revolutions output by the impeller rotation collection circuit module and sends them into the data storage module for storage, so that the impeller revolutions are not lost in power failure; meanwhile, the CPU module operates and judges the impeller revolutions, controls the alarm output module to indicate the current impeller fatigue state; the CPU module detects the output of the proximity switch collection circuit module in real time and extracts the sensor disassembly and maintenance signal; after reading the sensor disassembly signal, if the reset determination circuit module signal is collected, the impeller revolutions are reset, otherwise the counting is continued; thus the liquid turbine flowmeter fatigue record is realized and automatic diagnosis and alarm output are realized.

[0105] Finally, it should be noted that: the above only for preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. within the spirit and principle of the utility model, should be contained in the protection scope of the utility model.

Claims

1. A fatigue recording self-diagnosis alarm circuit for a liquid turbine flowmeter, characterized in that: The fatigue recording self-diagnosis alarm circuit includes an impeller rotation acquisition circuit, a proximity switch acquisition circuit, a reset determination circuit, a CPU, an alarm output circuit and a data storage device, wherein: The impeller rotation acquisition circuit is responsible for collecting the output signal of the signal detector of the liquid turbine flowmeter, amplifying and shaping it into a standard square wave and inputting it into the CPU; The proximity switch acquisition circuit converts the switch signal output by the proximity switch sensor into a pulse signal through an optical coupler and inputs the pulse signal into the CPU; The reset determination circuit is used to receive a reset determination signal input through a key, and input the reset determination signal into the CPU; The CPU receives a standard square wave from the impeller rotation acquisition circuit, converts the standard square wave into the impeller rotation number through calculation, and stores the statistical impeller rotation number in a data memory. At the same time, the impeller rotation number is used to control the alarm output circuit to indicate the current fatigue state of the impeller; The CPU monitors the proximity switch sensor in real time by receiving a pulse signal from the proximity switch acquisition circuit to obtain the state of the proximity switch sensor to determine whether the liquid turbine flowmeter is in a normal working state or in a disassembled maintenance state.

2. A fatigue recording self-diagnosis alarm circuit for a liquid turbine flowmeter according to claim 1, characterized in that: The two input terminals of the impeller rotation acquisition circuit are respectively the two output terminals SIG_A and SIG_B of the signal detector; The impeller rotation acquisition circuit is composed of resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C1, operational amplifier U1, operational amplifier U2; wherein: The output terminal SIG_A is connected to the inverting input terminal 4 of the operational amplifier U1 through the resistor R2, the output terminal 1 of the operational amplifier U1 is connected to the inverting input terminal 4 of the operational amplifier U2, and the output terminal 1 of the operational amplifier U2 is connected to the pin CPU IO 1 of the CPU; One end of the parallel circuit consisting of resistor R3 and capacitor C1 is connected to the connection line between resistor R2 and inverting input terminal 4 of operational amplifier U1, and the other end is connected to the connection line between output terminal 1 of operational amplifier U1 and inverting input terminal 4 of operational amplifier U2; Pin 5 of the operational amplifier U1 is connected to the power supply VCC; The output terminal SIG_B, the non-inverting input terminal 3 of the operational amplifier U1 and the pin 2 of the operational amplifier U1 are connected to GND respectively; The output terminal SIG_A is connected to GND via a resistor R1; The non-inverting input terminal 3 of the operational amplifier U2 is connected to GND via a resistor R4; The non-inverting input terminal 3 of the operational amplifier U2 is connected to the power supply VCC through the resistor R5; The non-inverting input terminal 3 of the operational amplifier U2 is connected to the CPU IO 1 pin of the CPU via the resistor R6; Pin 3 of the operational amplifier U2 is connected to GND; Pin 5 of the operational amplifier U2 is connected to the power supply VCC.

3. The fatigue recording self-diagnosis alarm circuit of a liquid turbine flowmeter according to claim 2, characterized in that: The two output terminals SIG_A and SIG_B of the signal detector are respectively the two ends of an inductor coil with 1000 to 2000 turns surrounding a permanent magnetic steel.

4. A fatigue recording self-diagnosis alarm circuit for a liquid turbine flowmeter according to claim 1, characterized in that: The two input terminals of the proximity switch acquisition circuit are the output terminals SWITCH_OUT and SWITCH_GND of the proximity switch sensor respectively; The proximity switch acquisition circuit is composed of an optocoupler U3 and a resistor R7; wherein: The output terminal SWITCH_OUT of the proximity switch sensor is connected to the positive electrode of the input terminal of the optocoupler U3; The output terminal SWITCH_GND of the proximity switch sensor is connected to the negative electrode of the input terminal of the optocoupler U3; The emitter of the output end of the optical coupler U3 is grounded, and the collector thereof is connected to the power supply VCC via the resistor R7; The collector is also connected to the pin CPU_IO_2 of the CPU.

5. The fatigue recording self-diagnosis alarm circuit of a liquid turbine flowmeter according to claim 1, characterized in that: The reset determination circuit is composed of a button KEY1 and a resistor R8; Pin 1 of the key KEY is grounded; Pin 2 of the key KEY is connected to the power supply VCC through a resistor R8; Pin 2 of the key KEY is also connected to pin CPU_IO_3 of the CPU.

6. The fatigue recording self-diagnosis alarm circuit of a liquid turbine flowmeter according to claim 1, characterized in that: The alarm output circuit is composed of a resistor R12, a light-emitting diode LED1, a light-emitting diode LED2, a light-emitting diode LED3, and a light-emitting diode LED4; wherein: One end of the resistor R12 is connected to the CPU pins CPU_IO_10, CPU_IO_9, CPU_IO_8 and CPU_IO_7 through the light emitting diode LED1, the light emitting diode LED2, the light emitting diode LED3 and the light emitting diode LED4 respectively; The other end of the resistor R12 is connected to the power supply VCC.

7. The fatigue recording self-diagnosis alarm circuit of a liquid turbine flowmeter according to claim 1, characterized in that: The data memory is composed of a ferroelectric memory U4, a resistor R9, a resistor R10, and a resistor R11; Pins 1, 2, 3 and 4 of the ferroelectric memory U4 are grounded; Pin 8 of the ferroelectric memory U4 is connected to the power supply VCC; Pin 5 of the ferroelectric memory U4 is connected to pin CPU_IO_6 of the CPU and is connected to the power supply VCC through a resistor R11; Pin 6 of the ferroelectric memory U4 is connected to the CPU_IO_5 pin of the CPU and is connected to the power supply VCC through the resistor R10; Pin 7 of the ferroelectric memory U4 is connected to pin CPU_IO_4 of the CPU, and is connected to a power source VCC via a resistor R9.

8. The fatigue recording self-diagnosis alarm circuit of a liquid turbine flowmeter according to claim 1, characterized in that: The CPU is a microcontroller, wherein: The CPU pins CPU_IO_1, CPU_IO_2 and CPU_IO_3 are selected as input functions; The CPU pins CPU_IO_4, CPU_IO_5, CPU_IO_6, CPU_IO_7, CPU_IO_8, CPU_IO_9, and CPU_IO_10 are selected as output functions.

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