CN218628628U - Nuclear power plant vibration signal acquisition device - Google Patents
Nuclear power plant vibration signal acquisition device Download PDFInfo
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- CN218628628U CN218628628U CN202222408010.1U CN202222408010U CN218628628U CN 218628628 U CN218628628 U CN 218628628U CN 202222408010 U CN202222408010 U CN 202222408010U CN 218628628 U CN218628628 U CN 218628628U
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Abstract
The utility model discloses a nuclear power plant vibration signal acquisition device, include: the device comprises a vibration detection unit, a vibration acquisition module, a vibration transmitter and an isolation circuit, wherein the vibration detection unit is used for generating a vibration signal according to the vibration quantity of the device to be detected; implement the utility model discloses can make the vibration signal conversion of same acceleration sensor output be voltage type vibration signal and current type vibration signal, reduce acceleration sensor's installation quantity, satisfy different monitored control system to the requirement of signal type, ensure that vibration signal's source is unanimous, guarantee the monitoring result comparability of different monitored control system outputs, help improve accuracy and the reliability of equipment vibration trend tracking and state early warning.
Description
Technical Field
The utility model relates to a vibration detection technical field especially relates to a nuclear power plant vibration signal collection system.
Background
In a certain nuclear power plant, equipment faults caused by vibration values happen occasionally to mechanical equipment, and most of faults can be early warned in advance through an online vibration monitoring system so as to find abnormality in time; the online vibration monitoring system analyzes and diagnoses vibration faults based on original voltage type vibration signals and is limited by the signal type properties of the voltage type vibration signals, so that other monitoring systems in a nuclear power plant are difficult to directly acquire the voltage type vibration signals; for example, the working voltage of the DCS system in the nuclear power plant is relatively high, and the conventional vibration signal acquisition circuit cannot directly realize information interaction with the DCS system, so that the DCS system cannot normally acquire vibration signals, and is not beneficial to tracking and monitoring the overall vibration trend of the equipment by an operator of the DCS system. If a vibration signal acquisition circuit matched with the DCS is additionally arranged on the tested equipment, the cost is increased, and the comparison between the monitoring results output by the online vibration monitoring system and the DCS is lack of credibility due to the inconsistency of vibration signal sources.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that, a nuclear power plant vibration signal acquisition device is provided.
The utility model provides a technical scheme that its technical problem adopted is: a nuclear power plant vibration signal acquisition device configured to provide a voltage mode vibration signal and a current mode vibration signal, comprising:
a vibration detection unit for generating a vibration signal according to a vibration amount of the device under test;
the input end of the vibration acquisition module is connected with the vibration detection unit and outputs the voltage type vibration signal based on the vibration signal;
the vibration transmitter is used for carrying out type conversion on the vibration signal and outputting the current type vibration signal;
and the isolation circuit is connected between the vibration detection unit and the vibration transmitter and plays an isolation role.
Preferably, the vibration detection unit includes an acceleration sensor, a first amplification circuit, a blocking circuit, and a second amplification circuit;
the acceleration sensor is connected to the input end of the second amplifying circuit through the first amplifying circuit and the blocking circuit in sequence, and the output end of the second amplifying circuit is connected with the input end of the vibration acquisition module and the input end of the isolation circuit.
Preferably, the first amplifying circuit comprises a second resistor R2, a first operational amplifier U1, a second capacitor C2, a first resistor R1 and a third capacitor C3;
the first end of the acceleration sensor is connected to the inverting input end of the first operational amplifier U1 through the second resistor R2, the second end of the acceleration sensor is connected to the non-inverting input end of the first operational amplifier U1 and the ground, the first end of the second resistor R2 is connected to the ground through the second capacitor C2, the first end of the second resistor R2 is connected to the output end of the first operational amplifier U1 through the first resistor R1, and the output end of the first operational amplifier U1 serves as the output end of the first amplifying circuit and is connected to the input end of the blocking circuit.
Preferably, the dc blocking circuit includes a fourth capacitor C4; a first end of the fourth capacitor C4 is used as an input end of the blocking circuit and connected to an output end of the first amplifying circuit, and a second end of the fourth capacitor C4 is used as an output end of the blocking circuit and connected to an input end of the first amplifying circuit.
Preferably, the second amplifying circuit comprises a third resistor R3, a second operational amplifier U2, a fourth resistor R4, a thermistor W1, a fifth resistor R5, a fifth capacitor C5, an adjustable resistor W2 and a sixth resistor R6;
the output end of the blocking circuit is connected to the inverting input end of the second operational amplifier U2 through the third resistor R3, the inverting input end of the second operational amplifier U2 is connected to the output end of the second operational amplifier U2 through the fourth resistor R4 and the thermistor W1 in sequence, the non-inverting input end of the second operational amplifier U2 is connected to the ground through the fifth resistor R5, the inverting input end of the second operational amplifier U2 is further connected to the output end of the second operational amplifier U2 through the fifth capacitor C5, the first end and the second end of the adjustable resistor W2 are respectively connected to the first offset end and the second offset end of the second operational amplifier U2, the adjusting end of the adjustable resistor W2 is connected to the grounding end of the second operational amplifier U2 through the sixth resistor R6, and the output end of the second operational amplifier U2 and the adjusting end of the adjustable resistor W2 form the output end of the vibration detection unit.
Preferably, the vibration acquisition module comprises an integrating circuit and a comparing circuit;
the vibration detection unit is connected to the input end of the comparison circuit through the integration circuit in sequence, and the output end of the comparison circuit is used for outputting the voltage type vibration signal.
Preferably, the integrating circuit comprises a forty-first resistor R41, a third operational amplifier U3A, a thirty-ninth resistor R39, a twenty-first capacitor C21, a forty-fifth resistor R45, a forty-seventh resistor R47, a forty-sixth resistor R46 and a twenty-fourth capacitor C24;
a first output end of the vibration detection unit is connected to a non-inverting input end of the third operational amplifier U3A through the forty-first resistor R41, the non-inverting input end of the third operational amplifier U3A is connected to the ground through the thirty-ninth resistor R39, and the twenty-first capacitor C21 is connected in parallel with the thirty-ninth resistor R39;
the second output end of the vibration detection unit is connected to the inverting input end of the third operational amplifier U3A through the forty-fifth resistor R45, the second output end of the vibration detection unit is further connected to the ground through the forty-seventh resistor R47, the inverting input end of the third operational amplifier U3A is connected to the output end of the third operational amplifier U3A through the forty-sixth resistor R46, the output end of the third operational amplifier U3A is connected to the input end of the comparison circuit, and the twenty-fourth capacitor C24 is connected in parallel with the forty-sixth resistor R46.
Preferably, the comparison circuit comprises a forty-second resistor R42, a fourth operational amplifier U3B, a forty-fourth resistor R44, a forty-third resistor R43, and a forty-fourth resistor R40;
a first end of the forty-second resistor R42 is used as an input end of the comparison circuit and is connected to the integrating circuit, a second end of the forty-second resistor R42 is connected to a non-inverting input end of the fourth operational amplifier U3B, the non-inverting input end of the fourth operational amplifier U3B is connected to an output end of the fourth operational amplifier U3B through the forty-fourth resistor R40, an output end of the fourth operational amplifier U3B is connected to a first end of the forty-third resistor R43, the second end of the forty-third resistor R43 is an output end of the vibration collection module, and an inverting input end of the fourth operational amplifier U3B is connected to the ground through the forty-fourth resistor R44.
Preferably, the vibration transmitter comprises a thirteenth resistor R13, a conversion chip U5, a twelfth resistor R12, a PNP triode Q1, a PMOS transistor Q2, and a sixteenth resistor R16;
the second end of thirteenth resistance R13 is connected isolation circuit, the first end of thirteenth resistance R13 is connected the switching signal input end of conversion chip U5, the output current of conversion chip U5 sets up the end and connects the second end of twelfth resistance R12 with PNP triode Q1's projecting pole, the first end of twelfth resistance R12 with PNP triode Q1's base with PMOS pipe Q2's source electrode, conversion chip U5's control output end connects PNP triode Q1's collecting electrode with PMOS pipe Q2's grid, PMOS pipe Q2's drain electrode is connected the first end of sixteenth resistance R16, the first end of sixteenth resistance R16 is used for exporting current type vibration signal.
Preferably, the isolation circuit comprises an isolated safety barrier.
The utility model discloses following beneficial effect has at least: provided is a nuclear power plant vibration signal acquisition device, including: the device comprises a vibration detection unit, a vibration acquisition module, a vibration transmitter and an isolation circuit, wherein the vibration detection unit is used for generating a vibration signal according to the vibration quantity of equipment to be detected; implement the utility model discloses can make the vibration signal conversion of same acceleration sensor output be voltage type vibration signal and current type vibration signal, reduce acceleration sensor's installation quantity, not only satisfy different monitored control system to the requirement of signal type, can also ensure that vibration signal's source is unanimous, guarantee the monitoring result comparability of different monitored control system outputs, help improve accuracy and the reliability of equipment vibration trend tracking and state early warning.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural view of a nuclear power plant vibration signal acquisition device in the present invention;
fig. 2 is a circuit diagram of a vibration detection unit in a vibration signal acquisition device of a nuclear power plant provided by the present invention;
fig. 3 is a circuit diagram of a vibration acquisition module in the nuclear power plant vibration signal acquisition device provided by the present invention;
fig. 4 is a circuit diagram of a vibration transmitter in a vibration signal acquisition device of a nuclear power plant.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the utility model provides a nuclear power plant vibration signal collection system for provide voltage type vibration signal and current type vibration signal, nuclear power plant vibration signal collection system includes: vibration detecting element 1, vibration acquisition module 2, vibration transmitter 3 and isolating circuit 4.
The vibration detection unit 1 is used for generating a vibration signal according to the vibration quantity of the device under test.
The input end of the vibration acquisition module 2 is connected with the vibration detection unit 1, the vibration acquisition module 2 also outputs voltage type vibration signals based on the vibration signals, and the output end of the vibration acquisition module outputs voltage type vibration signals.
The vibration transmitter 3 is used for performing type conversion on the vibration signal and outputting a current type vibration signal.
The isolation circuit 4 is connected between the vibration detection unit 1 and the vibration transmitter 3, and is used for isolating the vibration detection unit 1 from the vibration transmitter 3.
In some embodiments, as shown in fig. 2, the vibration detection unit 1 includes an acceleration sensor 11, a first amplification circuit 12, a dc blocking circuit 13, and a second amplification circuit 14. Specifically, the acceleration sensor 11 is connected to an input end of a second amplifying circuit 14 through a first amplifying circuit 12 and a blocking circuit 13 in sequence, and an output end of the second amplifying circuit 14 is connected to an input end of the vibration acquisition module 2 and an input end of the isolation circuit 4.
It should be noted that the acceleration sensor 11 may be a piezoelectric acceleration sensor commonly used in the prior art, and is mounted on the device under test to convert the vibration quantity of the device under test into a voltage signal.
In order to enable the acceleration sensor 11 to adapt to a high-strength working environment in a nuclear power plant area, so that certain requirements are required for the performance of the acceleration sensor 11, in some embodiments, the response frequency of the acceleration sensor 11 is 0.5-15,000hz, the shock resistance peak value needs to reach 5000g, the working temperature range is-50 ℃ to 121 ℃, and the protection grade is IP68.
In some embodiments, as shown in fig. 2, the first amplifying circuit 12 includes a second resistor R2, a first operational amplifier U1, a second capacitor C2, a first resistor R1, and a third capacitor C3. Specifically, a first end of the acceleration sensor 11 is connected to an inverting input end of the first operational amplifier U1 through the second resistor R2, a second end of the acceleration sensor 11 is connected to a non-inverting input end of the first operational amplifier U1 and the ground, a first end of the second resistor R2 is connected to the ground through the second capacitor C2, a first end of the second resistor R2 is further connected to an output end of the first operational amplifier U1 through the first resistor R1, and an output end of the first operational amplifier U1 serves as an output end of the first amplifying circuit 12 and is connected to an input end of the dc blocking circuit 13.
In some embodiments, as shown in fig. 2, the dc blocking circuit 13 includes a fourth capacitor C4. Specifically, a first end of the fourth capacitor C4 is used as an input end of the dc blocking circuit 13 and connected to the output end of the first amplifying circuit 12, and a second end of the fourth capacitor C4 is used as an output end of the dc blocking circuit 13 and connected to the input end of the first amplifying circuit 12.
In some embodiments, as shown in fig. 2, the second amplifying circuit 14 includes a third resistor R3, a second operational amplifier U2, a fourth resistor R4, a thermistor W1, a fifth resistor R5, a fifth capacitor C5, an adjustable resistor W2, and a sixth resistor R6. The model of the second operational amplifier U2 may be UA776, pin 1 of the UA776 corresponds to the first offset terminal, pin 5 of the UA776 corresponds to the second offset terminal, and pin 4 of the UA776 corresponds to the ground terminal.
Specifically, the output end of the dc blocking circuit 13 is connected to the inverting input end of the second operational amplifier U2 through the third resistor R3, the inverting input end of the second operational amplifier U2 is connected to the output end of the second operational amplifier U2 through the fourth resistor R4 and the thermistor W1 in sequence, the non-inverting input end of the second operational amplifier U2 is connected to the ground through the fifth resistor R5, the inverting input end of the second operational amplifier U2 is further connected to the output end of the second operational amplifier U2 through the fifth capacitor C5, the first end and the second end of the adjustable resistor W2 are connected to the first offset end and the second offset end of the second operational amplifier U2, the adjusting end of the adjustable resistor W2 is connected to the ground end of the second operational amplifier U2 through the sixth resistor R6, and the output end of the second operational amplifier U2 and the adjusting end of the adjustable resistor W2 form the output end of the vibration detection unit 1 to output the vibration signal.
Referring to fig. 2, the vibration detecting unit 1 operates as follows: the acceleration sensor 11 converts the vibration quantity of the device to be tested into a voltage signal, and the voltage signal is amplified for the first time by the first amplifier circuit 12; then, the dc blocking circuit 13 filters out the dc component in the voltage signal; then, the voltage signal from which the dc component is filtered is amplified for the second time by the second amplifier circuit 14, and then output as a vibration signal. Wherein, the gain coefficient of the first amplifier circuit 12 can be adjusted by adjusting the resistance ratio of the first resistor R1 and the second resistor R2; the gain factor of the second amplifier circuit 14 is adjusted by the ratio of the sum of the fourth resistor R4 and the thermistor W1 to the resistance value of the third resistor R3.
In some embodiments, as shown in fig. 3, the vibration acquisition module 2 includes an integration circuit 21 and a comparison circuit 22. Specifically, the vibration detection unit 1 is sequentially connected to an input end of a comparison circuit 22 through an integration circuit 21, and an output end of the comparison circuit 22 is used for outputting a voltage type vibration signal.
In some embodiments, as shown in fig. 3, the integrating circuit 21 includes a forty-first resistor R41, a third operational amplifier U3A, a thirty-ninth resistor R39, a twenty-first capacitor C21, a forty-fifth resistor R45, a forty-seventh resistor R47, a forty-sixth resistor R46, and a twenty-fourth capacitor C24.
Specifically, the first output end of the vibration detection unit 1 is connected to the non-inverting input end of the third operational amplifier U3A through a forty-first resistor R41, the non-inverting input end of the third operational amplifier U3A is connected to the ground through a thirty-ninth resistor R39, the twenty-first capacitor C21 is connected in parallel with the thirty-ninth resistor R39, the second output end of the vibration detection unit 1 is connected to the inverting input end of the third operational amplifier U3A through a forty-fifth resistor R45, the second output end of the vibration detection unit 1 is further connected to the ground through a forty-seventh resistor R47, the inverting input end of the third operational amplifier U3A is connected to the output end of the third operational amplifier U3A through a forty-sixth resistor R46, the output end of the third operational amplifier U3A is connected to the input end of the comparison circuit 22, and the twenty-fourth capacitor C24 is connected in parallel with the forty-sixth resistor R46.
It should be noted that, in conjunction with the embodiments of fig. 2 and fig. 3, the first output terminal of the vibration detection unit 1 corresponds to the output terminal of the second operational amplifier U2, and the second output terminal of the vibration detection unit 1 corresponds to the adjustment terminal of the adjustable resistor W2.
In order to improve the interference rejection and stability of the integrating circuit 21, in some embodiments, as shown in fig. 3, the integrating circuit 21 further includes a protection tube VD3, a first voltage regulator VD2, a second voltage regulator VD4, a twenty-second capacitor C22, and a twenty-third capacitor C23. Wherein, protection tube VD3 may be an ESD tube.
Specifically, a first output end of the vibration detection unit 1 is connected to a second output end of the vibration detection unit 1 through a protection tube VD3, a non-inverting input end of a third operational amplifier U3A is connected with a cathode of a first voltage-regulator tube VD2, an anode of the first voltage-regulator tube VD2 is connected with an anode of a second voltage-regulator tube VD4, a cathode of the second voltage-regulator tube VD4 is connected with an inverting input end of the third operational amplifier U3A, a power supply end of the third operational amplifier U3A is connected to the ground through a twenty-second capacitor C22, and a grounding end of the third operational amplifier U3A is connected to the ground through a twenty-third capacitor C23.
In some embodiments, as shown in fig. 3, the comparison circuit 22 includes a forty-second resistor R42, a fourth operational amplifier U3B, a forty-fourth resistor R44, a forty-fourth resistor R40, and a forty-third resistor R43.
Specifically, a first end of a forty-second resistor R42 is used as an input end of the comparison circuit 22 and connected to the integration circuit 21, a second end of the forty-second resistor R42 is connected to a non-inverting input end of a fourth operational amplifier U3B, the non-inverting input end of the fourth operational amplifier U3B is connected to an output end of the fourth operational amplifier U3B through a forty-fourth resistor R40, an output end of the fourth operational amplifier U3B is connected to a first end of a forty-third resistor R43, a second end of the forty-third resistor R43 is used as an output end of the vibration acquisition module 2 to output a voltage-type vibration signal, and an inverting input end of the fourth operational amplifier U3B is connected to ground through a forty-fourth resistor R44.
Referring to fig. 3, the working principle of the vibration acquisition module 2 is as follows: because the vibration signal output by the acceleration sensor is used for representing the vibration acceleration peak value), the vibration signal is integrated by the integrating circuit 21, and a vibration speed effective value can be obtained; the effective value of the vibration speed is processed by the comparison circuit 22, and a voltage type vibration signal for representing the effective value of the vibration speed is output. Furthermore, the voltage type vibration signal is a digital signal, and can provide a diagnosis basis for an online vibration monitoring system of some nuclear power plants.
In some embodiments, as shown in fig. 4, the vibration transmitter 3 includes a thirteenth resistor R13, a conversion chip U5, an eleventh resistor R11, an eleventh capacitor C11, a twelfth resistor R12, a PNP transistor Q1, a PMOS transistor Q2, a diode D1, a sixteenth resistor R16, a fourteenth resistor R14, and a fifteenth resistor R15. The model of the conversion chip U5 may be XTR111, pin 6 of the XTR111 corresponds to a conversion signal input terminal, pin 7 of the XTR111 corresponds to a transconductance setting terminal, pin 2 of the XTR111 corresponds to an output current setting terminal, pin 3 of the XTR111 corresponds to a control output terminal, pin 5 of the XTR111 corresponds to a first calibration terminal, and pin 4 of the XTR111 corresponds to a second calibration terminal; the model of the PNP triode Q1 can be SS8550; the model of the PMOS tube Q2 can be SI2309.
Specifically, the second end of the thirteenth resistor R13 is connected to the isolation circuit 4, the first end of the thirteenth resistor R13 is connected to the conversion signal input end of the conversion chip U5, the transconductance setting end of the conversion chip U5 is connected to the ground through the eleventh resistor R11, the power supply input end of the conversion chip U5 is connected to the ground through the eleventh capacitor C11, the output current setting end of the conversion chip U5 is connected to the second end of the twelfth resistor R12 and the emitter of the PNP transistor Q1, the first end of the twelfth resistor R12 and the base of the PNP transistor Q1 and the source of the PMOS transistor Q2, the control output end of the conversion chip U5 is connected to the collector of the PNP transistor Q1 and the gate of the PMOS transistor Q2, the drain of the PMOS transistor Q2 is connected to the anode of the diode D1 and the first end of the sixteenth resistor R16, the cathode of the diode D1 is connected to the first direct-current voltage, the first end of the sixteenth resistor R16 is used for outputting a current-type vibration signal, the first calibration end of the conversion chip U5 is connected to the first end of the fourteenth resistor R14 and the fifteenth calibration resistor R15, and the fifteenth calibration resistor R15 is connected to the second end of the fifteenth calibration resistor R15.
In some embodiments, the isolation circuit 4 comprises an isolated safety barrier. Optionally, the isolated safety barrier is KFD2-VR4-Ex1.26. The isolation type safety barrier is used for isolating the vibration acquisition module 2 and the vibration transmitter 3, and the surfaces of the two modules are mutually influenced, so that the signal transmission of each circuit is stable and reliable, and the effect of protecting the vibration transmitter is achieved.
Referring to fig. 4, the operating principle of the vibration transmitter 3 is: vibration signals are input to the conversion chip U5 through the isolation circuit 4, the conversion chip U5 controls the current value of the current mode vibration signals through the output current setting end according to the effective value of the vibration signals, and controls the opening and closing of the PMOS tube Q2 through the control output end, so that whether the current mode vibration signals are output or not is controlled. In addition, in this embodiment, the current mode vibration signal is a current signal of 4 to 20mA, and the magnitude of the current signal is proportional to the magnitude of the vibration amount of the device under test, so that the magnitude of the vibration amount can be represented by the magnitude of the current value of the current mode vibration signal. Further, the current mode vibration signal can provide monitoring basis for DCS system of some nuclear power plants.
It can be understood, implement the utility model discloses can make the vibration signal conversion of same acceleration sensor output be voltage type vibration signal and current type vibration signal, reduce acceleration sensor's installation quantity, not only satisfy different monitored control system to the requirement of signal type, can also ensure that vibration signal's source is unanimous, guarantee the monitoring result comparability of different monitored control system outputs, help improve accuracy and the reliability of equipment vibration trend tracking and state early warning.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. The utility model provides a nuclear power plant vibration signal collection system for provide voltage mode vibration signal and current mode vibration signal, its characterized in that includes:
a vibration detection unit (1) for generating a vibration signal according to a vibration amount of a device under test;
the input end of the vibration acquisition module (2) is connected with the vibration detection unit (1) and outputs the voltage type vibration signal based on the vibration signal;
the vibration transmitter (3) is used for carrying out type conversion on the vibration signal and outputting the current type vibration signal;
and an isolation circuit (4) connected between the vibration detection unit (1) and the vibration transmitter (3) for isolation.
2. A nuclear power plant vibration signal acquisition device according to claim 1, characterized in that the vibration detection unit (1) comprises an acceleration sensor (11), a first amplification circuit (12), a blocking circuit (13) and a second amplification circuit (14);
the acceleration sensor (11) is connected to the input end of the second amplifying circuit (14) through the first amplifying circuit (12) and the blocking circuit (13) in sequence, and the output end of the second amplifying circuit (14) is connected with the input end of the vibration acquisition module (2) and the input end of the isolation circuit (4).
3. The nuclear power plant vibration signal acquisition device of claim 2, wherein the first amplification circuit (12) comprises a second resistor R2, a first operational amplifier U1, a second capacitor C2, a first resistor R1 and a third capacitor C3;
the first end of the acceleration sensor (11) is connected to the inverting input end of the first operational amplifier U1 through the second resistor R2, the second end of the acceleration sensor (11) is connected to the non-inverting input end of the first operational amplifier U1 and the ground, the first end of the second resistor R2 is connected to the ground through the second capacitor C2, the first end of the second resistor R2 is further connected to the output end of the first operational amplifier U1 through the first resistor R1, and the output end of the first operational amplifier U1 serves as the output end of the first amplifying circuit (12) to be connected with the input end of the blocking circuit (13).
4. A nuclear power plant vibration signal acquisition arrangement according to claim 2, characterized in that the dc blocking circuit (13) comprises a fourth capacitance C4; and a first end of the fourth capacitor C4 is used as an input end of the blocking circuit (13) and connected with an output end of the first amplifying circuit (12), and a second end of the fourth capacitor C4 is used as an output end of the blocking circuit (13) and connected with an input end of the first amplifying circuit (12).
5. The nuclear power plant vibration signal acquisition device of claim 2, wherein the second amplification circuit (14) comprises a third resistor R3, a second operational amplifier U2, a fourth resistor R4, a thermistor W1, a fifth resistor R5, a fifth capacitor C5, an adjustable resistor W2 and a sixth resistor R6;
the output end of the blocking circuit (13) is connected to the inverting input end of the second operational amplifier U2 through the third resistor R3, the inverting input end of the second operational amplifier U2 is connected to the output end of the second operational amplifier U2 through the fourth resistor R4 and the thermistor W1 in sequence, the non-inverting input end of the second operational amplifier U2 is connected to the ground through the fifth resistor R5, the inverting input end of the second operational amplifier U2 is further connected to the output end of the second operational amplifier U2 through the fifth capacitor C5, the first end and the second end of the adjustable resistor W2 are respectively connected to the first offset end and the second offset end of the second operational amplifier U2, the adjusting end of the adjustable resistor W2 is connected to the grounding end of the second operational amplifier U2 through the sixth resistor R6, and the output end of the second operational amplifier U2 and the adjusting end of the adjustable resistor W2 form the output end of the vibration detection unit (1).
6. The nuclear power plant vibration signal acquisition device of any of claims 1 to 5, wherein the vibration acquisition module (2) comprises an integration circuit (21) and a comparison circuit (22);
the vibration detection unit (1) is connected to the input end of the comparison circuit (22) through the integration circuit (21) in sequence, and the output end of the comparison circuit (22) is used for outputting the voltage type vibration signal.
7. The nuclear power plant vibration signal acquisition device of claim 6, wherein the integration circuit (21) comprises a forty-first resistor R41, a third operational amplifier U3A, a thirty-ninth resistor R39, a twenty-first capacitor C21, a forty-fifth resistor R45, a forty-seventh resistor R47, a forty-sixth resistor R46, and a twenty-fourth capacitor C24;
the first output end of the vibration detection unit (1) is connected to the non-inverting input end of the third operational amplifier U3A through the forty-first resistor R41, the non-inverting input end of the third operational amplifier U3A is connected to the ground through the thirty-ninth resistor R39, and the twenty-first capacitor C21 is connected with the thirty-ninth resistor R39 in parallel;
the second output end of the vibration detection unit (1) is connected to the inverting input end of the third operational amplifier U3A through the forty-fifth resistor R45, the second output end of the vibration detection unit (1) is also connected to the ground through the forty-seventh resistor R47, the inverting input end of the third operational amplifier U3A is connected to the output end of the third operational amplifier U3A through the forty-sixth resistor R46, the output end of the third operational amplifier U3A is connected to the input end of the comparison circuit (22), and the twenty-fourth capacitor C24 is connected with the forty-sixth resistor R46 in parallel.
8. A nuclear power plant vibration signal acquisition arrangement according to claim 6, characterized in that the comparison circuit (22) comprises a forty-second resistor R42, a fourth operational amplifier U3B, a forty-fourth resistor R44, a forty-fourth resistor R40 and a forty-third resistor R43;
a first end of the forty-second resistor R42 is used as an input end of the comparison circuit (22) and connected to the integrating circuit (21), a second end of the forty-second resistor R42 is connected to a non-inverting input end of the fourth operational amplifier U3B, the non-inverting input end of the fourth operational amplifier U3B is connected to an output end of the fourth operational amplifier U3B through the forty-fourth resistor R40, an output end of the fourth operational amplifier U3B is connected to a first end of the forty-third resistor R43, the second end of the forty-third resistor R43 is an output end of the vibration acquisition module (2), and an inverting input end of the fourth operational amplifier U3B is connected to the ground through the forty-fourth resistor R44.
9. The nuclear power plant vibration signal acquisition device according to any of claims 1 to 5, wherein the vibration transmitter (3) comprises a thirteenth resistor R13, a conversion chip U5, a twelfth resistor R12, a PNP triode Q1, a PMOS tube Q2 and a sixteenth resistor R16;
the second end of thirteenth resistance R13 is connected isolation circuit (4), the first end of thirteenth resistance R13 is connected the switching signal input part of conversion chip U5, the output current of conversion chip U5 sets up the end and connects the second end of twelfth resistance R12 with PNP triode Q1's projecting pole, the first end of twelfth resistance R12 with PNP triode Q1's base with PMOS pipe Q2's source electrode, conversion chip U5's control output end connects PNP triode Q1's collecting electrode with PMOS pipe Q2's grid, PMOS pipe Q2's drain electrode is connected the first end of sixteenth resistance R16, the first end of sixteenth resistance R16 is used for exporting current type vibration signal.
10. A nuclear power plant vibration signal acquisition device according to any of claims 1 to 5, characterized in that the isolation circuit (4) comprises an isolated safety barrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222408010.1U CN218628628U (en) | 2022-09-08 | 2022-09-08 | Nuclear power plant vibration signal acquisition device |
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