Nuclear power plant alarm driving card with counting function

Abstract

The utility model relates to the technical field of nuclear power plant alarm systems, and discloses a nuclear power plant alarm driving card with a counting function, which comprises a sensor circuit, an alarm circuit, a relay and a counting circuit, wherein the counting circuit comprises a unit counting unit, which is used for counting the action times of the relay so as to output the unit number of the alarm times; the ten-digit counting unit is used for counting the number of times of obtaining the carry signal so as to output ten digits of the alarm number of times; the display unit is used for displaying the alarm times; and the reset unit is used for controlling the corresponding counting unit to reset when the unit digit or the tens digit reaches an upper limit value, and outputting one carry signal after the unit digit counting unit is reset each time. According to the utility model, the alarm frequency of the nuclear power plant alarm driving card can be counted and displayed, so that workers can conveniently know the current alarm frequency of the alarm driving card.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant alarm systems, in particular to a nuclear power plant alarm drive card with a counting function. Background Art

[0002] The alarm system of a nuclear power plant is one of the key systems for maintaining the safe operation of a nuclear power plant. The alarm system of a nuclear power plant generally uses an alarm driver card to monitor the status of sensors such as pressure sensors, displacement sensors, and liquid level sensors in real time. When the pressure sensors, displacement sensors, and liquid level sensors exceed the preset threshold range, an alarm signal will be generated in time to prompt the staff to handle it in time.

[0003] Although the existing alarm driver cards can generate alarms for abnormal situations, there is a lack of quantitative statistics on the alarms. In order to facilitate the staff to accurately understand the frequency of failures and to provide analysis and guidance for the safe operation of nuclear power plants from a statistical perspective, nuclear power plants are currently in urgent need of a facility that can record the number of alarms from the alarm driver card. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a nuclear power plant alarm drive card with a counting function.

[0005] The utility model solves the technical problem by adopting a technical solution: constructing a nuclear power plant alarm driver card with a counting function, including a sensor circuit for detecting environmental information, an alarm circuit for outputting an alarm signal, a relay for driving the sensor circuit to work when the environmental information exceeds a preset limit, and a counting circuit; wherein the counting circuit includes:

[0006] A units-digit counting unit, connected to the normally open contact of the relay, for counting the number of actions of the relay to output the units-digit of the number of alarms;

[0007] A tens-digit counting unit connected to the ones-digit counting unit, for obtaining the number of carry signals for counting, so as to output the tens-digit of the number of alarms;

[0008] A display unit connected to the ones counting unit and the tens counting unit, and used to display the alarm times; and

[0009] A reset unit is connected to the ones digit counting unit and the tens digit counting unit, and is used to control the corresponding counting unit to be reset when the ones digit or the tens digit reaches an upper limit value, and output a carry signal after the ones digit counting unit is reset each time.

[0010] Preferably, the ones-digit counting unit includes a ones-digit counter U12; the tens-digit counting unit includes a tens-digit counter U9;

[0011] The counting trigger end of the ones-digit counter U12 is connected to the normally open contact of the relay, the clearing end of the ones-digit counter U12 is connected to the counting trigger end of the tens-digit counter U9 and the reset unit, the clearing end of the tens-digit counter U9 is connected to the reset unit, and the counting value output end of the ones-digit counter U12 and the counting value output end of the tens-digit counter U9 are connected to the display unit and the reset unit respectively.

[0012] Preferably, the display unit comprises:

[0013] A units digit display unit, used to display the units digit;

[0014] a tens digit display unit, used for displaying the tens digit; and

[0015] The driving unit is connected to the ones digit counter U12, the tens digit counter U9, the ones digit display unit and the tens digit display unit, and is used to control the displayed digits of the ones digit display unit and the tens digit display unit respectively.

[0016] Preferably, the units display unit includes a first digital tube U10 and seven first resistors R1; wherein the first digital tube U10 includes a first common cathode and seven first anodes;

[0017] The first common cathode is grounded, and each of the first anodes is connected to the driving unit via the corresponding first resistor R1;

[0018] The ten-digit display unit includes a second digital tube U8 and seven second resistors R2; wherein the second digital tube U8 includes a second common cathode and seven second anodes;

[0019] The second common cathode is grounded, and each of the second anodes is connected to the driving unit via the corresponding second resistor R2.

[0020] Preferably, the driving unit comprises:

[0021] A ones digit driver U11, connected to the ones digit display unit and the ones digit counter U12, and configured to drive the ones digit display unit according to a signal output from a count value output terminal of the ones digit counter U12; and

[0022] The tens-digit driver U7 is connected to the tens-digit display unit and the tens-digit counter U9, and is used to drive the tens-digit display unit according to the signal output from the count value output terminal of the tens-digit counter U9.

[0023] Preferably, the ones-digit driver U11 and the tens-digit driver U7 are both display driver chips of model CD4511.

[0024] Preferably, the nuclear power plant alarm drive card with counting function further comprises a current limiting unit connected between the normally open contact of the relay and the ones-digit counting unit for preventing the ones-digit counting unit from being damaged by overcurrent.

[0025] Preferably, the nuclear power plant alarm drive card with counting function further comprises a power supply unit connected to the ones counting unit, the tens counting unit and the display unit.

[0026] Preferably, the ones-digit counter U12 and the tens-digit counter U9 are both four-digit binary calculators;

[0027] The reset unit comprises:

[0028] A first NAND gate, wherein a first input end thereof is connected to a second count value output end of the units counter U12, a second input end thereof is connected to a fourth count value output end of the units counter U12, and an output end thereof is connected to a reset end of the units counter U12 and a count trigger end of the tens counter U9; and

[0029] The second NAND gate has a first input end connected to the second count value output end of the ten-digit counter U9, a second input end connected to the fourth count value output end of the ten-digit counter U9, and an output end connected to the reset end of the ten-digit counter U9.

[0030] Preferably, the ones-digit counter U12 and the tens-digit counter U9 are both binary counters of model SN74LS161; and / or

[0031] The reset unit is a NAND gate logic circuit of model CD4011, and the NAND gate logic circuit includes four NAND gate circuits, wherein two of the NAND gate circuits correspond to the first NAND gate and the second NAND gate respectively.

[0032] The implementation of the utility model has the following beneficial effects: providing a nuclear power plant alarm driver card with a counting function; being able to count and display the alarm times of the nuclear power plant alarm driver card, making it convenient for staff to know the current alarm times of the nuclear power plant alarm driver card, allowing staff to accurately understand the frequency of occurrence of faults, and providing important data support for analyzing the safe operation of nuclear power plants and the causes of faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0034] Figure 1It is a circuit structure block diagram of a nuclear power plant alarm driver card in some embodiments of the utility model;

[0035] Figure 2 It is a circuit principle diagram of the counting circuit in some embodiments of the utility model. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0037] In the following description, it is necessary to understand that the directions or positional relationships indicated by “front”, “back”, “up”, “down”, “left”, “right”, “longitudinal”, “horizontal”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “head”, and “tail”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution, and do not indicate that the device or element referred to must have a specific direction. Therefore, they should not be understood as a limitation on the present utility model.

[0038] The utility model provides a nuclear power plant alarm driver card with counting function, such as Figure 1 The nuclear power plant alarm drive card comprises a sensor circuit, an alarm circuit, a relay and a main control circuit.

[0039] The sensor circuit is arranged in the environment to be monitored to detect environmental information of the environment to be monitored, such as pressure (e.g., steam generator), displacement (of generator shaft) or liquid level (e.g., steam generator), etc. Further, the sensor circuit may include a pressure sensor, a displacement sensor or a liquid level sensor, etc.

[0040] The alarm circuit is used to output an alarm signal when powered on, and the alarm signal includes an alarm sound and / or a prompt light. Further, the alarm circuit may include an audible and visual alarm.

[0041] The relay is connected to the alarm circuit, and the relay is used to drive the alarm circuit to work when it is energized (excited). Further, the relay may include an existing relay including multiple normally open contacts.

[0042] The main control circuit is connected to the sensor circuit and the relay. The main control circuit is used to obtain environmental information to control the relay to operate when the environmental information exceeds a preset limit, thereby driving the sensor circuit to operate.

[0043] The counting circuit is connected to any normally open contact of the relay to detect whether the normally open contact of the relay is energized, so as to count the number of times the normally open contact of the relay is energized, thereby counting the number of alarms of the nuclear power plant alarm drive card.

[0044] In some embodiments, Figure 2 As shown, the counting circuit includes a ones-digit counting unit 1, a tens-digit counting unit 2, a display unit 3 and a reset unit 4.

[0045] The units counting unit 1 is connected to the normally open contact of the relay and is used to count the number of times the relay has operated, so as to output the units digit of the number of alarms.

[0046] The tens counting unit 2 is connected to the ones counting unit 1. The tens counting unit 2 is used to obtain the number of carry signals for counting, so as to output the tens digit of the alarm number.

[0047] The display unit 3 is connected with the ones counting unit 1 and the tens counting unit 2. The display unit 3 is used to display the number of alarms.

[0048] The reset unit 4 is connected to the ones digit counting unit 1 and the tens digit counting unit 2. The reset unit 4 is used to control the corresponding counting unit to be reset when the ones digit or the tens digit reaches the upper limit value, and output a carry signal after each reset of the ones digit counting unit 1.

[0049] In this embodiment, the units counting unit 1, the tens counting unit 2 and the reset unit 4 cooperate with each other to count the number of relay actions, which is equivalent to counting the number of alarms of the nuclear power plant alarm driver card, and the number of alarms is displayed by the display unit 3 to facilitate the staff to know the current number of alarms of the nuclear power plant alarm driver card, so that the staff can accurately understand the frequency of occurrence of faults, providing important data support for analyzing the safe operation of nuclear power plants and the causes of faults.

[0050] In some embodiments, Figure 2 As shown, the ones counting unit 1 includes a ones counter U12 ; the tens counting unit 2 includes a tens counter U9 .

[0051] Specifically, the counting trigger end of the ones-digit counter U12 is connected to the normally open contact of the relay, the clearing end of the ones-digit counter U12 is connected to the counting trigger end and the reset unit 4 of the tens-digit counter U9, the clearing end of the tens-digit counter U9 is connected to the reset unit 4, the counting value output end of the ones-digit counter U12 and the counting value output end of the tens-digit counter U9 are connected to the display unit 3 and the reset unit 4 respectively, and the power supply end, counting control end and start control end of the ones-digit counter U12 are connected to the DC voltage at the same time as the power supply end, counting control end and start control end of the tens-digit counter U9.

[0052] In some embodiments, the ones counter U12 and the tens counter U9 are both four-bit binary counters. Further, the ones counter U12 and the tens counter U9 can both be binary counters of model SN74LS161. Furthermore, the counting trigger end of the ones-digit counter U12 or the tens-digit counter U9 corresponds to the second pin of the SN74LS161, the clearing end of the ones-digit counter U12 or the tens-digit counter U9 corresponds to the first pin of the SN74LS161, the counting value output end of the ones-digit counter U12 or the tens-digit counter U9 includes a first count value output end, a second count value output end, a third count value output end and a fourth count value output end, and the first to fourth count value output ends correspond to the 11th, 12th, 13th and 14th pins of the SN74LS161 respectively, the power supply end of the ones-digit counter U12 or the tens-digit counter U9 corresponds to the 16th pin of the SN74LS161, the counting control end of the ones-digit counter U12 or the tens-digit counter U9 corresponds to the 7th and 10th pins of the SN74LS161, and the start control end of the ones-digit counter U12 or the tens-digit counter U9 corresponds to the 9th pin of the SN74LS161.

[0053] In this embodiment, each time the relay is energized, a rising edge pulse is outputted because its normally open contact is closed, thereby increasing the count of the units counter U12 by 1 (i.e., the units digit is increased by 1). The reset unit 4 detects the level of the count value output terminal of the units counter U12 to obtain the current count value of the units counter U12. When the count value of the units counter U12 reaches 10, that is, the units digit has reached the upper limit value, the reset unit 4 outputs a low level to the reset terminal of the units counter U12, thereby setting the count of the units counter U12 to 0. After the count of the units counter U12 is set to 0, since the units digit is not When the condition of reaching the upper limit value is met, the electrical signal input to the reset terminal of the ones-digit counter U12 is set to a high level. At this time, the counting trigger terminal of the tens-digit counter U9 is equivalent to detecting a rising edge pulse, so the count of the tens-digit counter U9 is increased by 1 (that is, the tens digit is increased by 1). The reset unit 4 also obtains the current count value of the tens-digit counter U9 by detecting the level of the count value output terminal of the ones-digit counter U12. When the count of the tens-digit counter U9 reaches 10 (that is, the tens digit reaches the upper limit value), the reset unit 4 will output a low-level pulse to the reset terminal of the tens-digit counter U9, thereby setting the count value of the tens-digit counter U9 to 0.

[0054] In some embodiments, the reset unit 4 includes a first NAND gate and a second NAND gate.

[0055] Specifically, the first input end of the first NAND gate is connected to the second count value output end of the ones-digit counter U12, the second input end of the first NAND gate is connected to the fourth count value output end of the ones-digit counter U12, and the output end of the first NAND gate is connected to the reset end of the ones-digit counter U12 and the count trigger end of the tens-digit counter U9; the first input end of the second NAND gate is connected to the second count value output end of the tens-digit counter U9, the second input end of the second NAND gate is connected to the fourth count value output end of the tens-digit counter U9, and the output end of the second NAND gate is connected to the reset end of the tens-digit counter U9.

[0056] In this embodiment, taking the ones-digit counter U12 as an example, when the count value of the ones-digit counter U12 reaches 10, it is equivalent to the output setting value of the count value output terminal of the ones-digit counter U12 is "1010", that is, the second-digit count value output terminal and the fourth-digit count value output terminal are both high level, so the output terminal of the first NAND gate outputs a low level to the reset terminal of the ones-digit counter U12, so that the low level to the ones-digit counter U12 is reset, and after reset, the count value output terminal of the ones-digit counter U12 is set to "0000", so that the output terminal of the first NAND gate outputs a high level, that is, for the count trigger terminal of the tens-digit counter U9, it is equivalent to obtaining a rising edge pulse, so the tens-digit will be increased by 1. The reset principle of the tens-digit counter U9 can be referred to the ones-digit counter U12, and will not be repeated here.

[0057] Optionally, the reset unit 4 is a NAND gate logic circuit of model CD4011, and the NAND gate logic circuit of model CD4011 includes four NAND gate circuits, wherein two NAND gate circuits correspond to a first NAND gate and a second NAND gate, respectively.

[0058] In some embodiments, Figure 2 As shown, the display unit 3 includes a ones digit display unit 31 , a tens digit display unit 32 and a driving unit 33 .

[0059] The ones digit display unit 31 is used to display the ones digit.

[0060] In some embodiments, Figure 2 As shown, the units display unit 31 includes a first digital tube U10 and seven first resistors R1. The first digital tube U10 may be an existing common cathode digital tube, and further, the first digital tube U10 includes a first common cathode and seven first anodes.

[0061] Specifically, the first common cathode of the first digital tube U10 is grounded, and each first anode of the first digital tube U10 is connected to the driving unit 33 via a corresponding first resistor R1.

[0062] The tens digit display unit 32 is used to display the tens digit.

[0063] In some embodiments, Figure 2 As shown, the ten-digit display unit 32 includes a second digital tube U8 and seven second resistors R2; wherein the second digital tube U8 can be an existing common cathode digital tube, and further, the second digital tube U8 includes a second common cathode and seven second anodes.

[0064] Specifically, the second common cathode of the second digital tube U8 is grounded, and each second anode of the second digital tube U8 is connected to the driving unit 33 via a corresponding second resistor R2.

[0065] The driving unit 33 is connected to the ones counter U12, the tens counter U9, the ones display unit 31 and the tens display unit 32. The driving unit 33 is used to control the display numbers of the ones display unit 31 and the tens display unit 32 respectively.

[0066] In some embodiments, Figure 2 As shown, the driving unit 33 includes a ones-digit driver U11 and a tens-digit driver U7. The ones-digit driver U11 and the tens-digit driver U7 can both be display driver chips of model CD4511.

[0067] Specifically, the 9th to 15th pins of the unit driver U11 are respectively connected to the seven first anodes of the unit display unit 31 in one-to-one correspondence, the 6th, 2nd, 1st and 7th pins of the unit driver U11 are respectively connected to the first to fourth count value output terminals of the unit counter U12 in one-to-one correspondence, and the power supply terminal (16th pin) of the unit driver U11 is connected to a DC voltage. The unit driver U11 is used to drive the unit display unit 31 according to the signal output from the count value output terminal of the unit counter U12. The 9th to 15th pins of the ten driver U7 are respectively connected to the seven second anodes of the ten display unit 32, the 6th, 2nd, 1st and 7th pins of the ten driver U7 are respectively connected to the first to fourth count value output terminals of the ten counter U9 in one-to-one correspondence, and the power supply terminal (16th pin) of the ten driver U7 is connected to a DC voltage. The ten driver U7 is used to drive the ten display unit 32 according to the signal output from the count value output terminal of the ten counter U9.

[0068] In some embodiments, Figure 2 As shown, the nuclear power plant alarm drive card further includes a current limiting unit 5 connected between the normally open contact of the relay and the units counting unit 1, for preventing the units counting unit 1 from being damaged by overcurrent. Further, the current limiting unit 5 may be an existing fuse.

[0069] In some embodiments, the nuclear power plant alarm driver card further includes a power supply unit connected to the ones counting unit 1, the tens counting unit 2 and the display unit 3 for providing the DC voltage. Further, the power supply unit can be an existing switching power supply or a voltage stabilizing module capable of outputting a 5V DC voltage.

[0070] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A nuclear power plant alarm driver card with counting function, characterized in that: The invention comprises a sensor circuit for detecting environmental information, an alarm circuit for outputting an alarm signal, a relay for driving the sensor circuit to work when the environmental information exceeds a preset limit, and a counting circuit; wherein the counting circuit comprises: A units-digit counting unit (1), connected to the normally open contact of the relay, and used to count the number of times the relay operates, so as to output the units-digit of the number of alarms; A tens-digit counting unit (2) connected to the ones-digit counting unit (1) for obtaining the number of carry signals for counting, so as to output the tens-digit of the number of alarms; a display unit (3), connected to the ones-digit counting unit (1) and the tens-digit counting unit (2), and used for displaying the number of alarms; and A reset unit (4) is connected to the ones-digit counting unit (1) and the tens-digit counting unit (2), and is used to control the corresponding counting unit to be reset when the ones-digit or the tens-digit reaches an upper limit value, and output a carry signal after each reset of the ones-digit counting unit (1).

2. The nuclear power plant alarm driver card with counting function according to claim 1, characterized in that: The ones-digit counting unit (1) comprises a ones-digit counter U12; the tens-digit counting unit (2) comprises a tens-digit counter U9; The counting trigger end of the ones-digit counter U12 is connected to the normally open contact of the relay, the reset end of the ones-digit counter U12 is connected to the counting trigger end of the tens-digit counter U9 and the reset unit (4), the reset end of the tens-digit counter U9 is connected to the reset unit (4), and the counting value output end of the ones-digit counter U12 and the counting value output end of the tens-digit counter U9 are connected to the display unit (3) and the reset unit (4) respectively.

3. The nuclear power plant alarm driver card with counting function according to claim 2, characterized in that: The display unit (3) comprises: A units digit display unit (31), used for displaying the units digit; A tens digit display unit (32), used for displaying the tens digit; and A driving unit (33) is connected to the ones digit counter U12, the tens digit counter U9, the ones digit display unit (31) and the tens digit display unit (32), and is used to control the displayed digits of the ones digit display unit (31) and the tens digit display unit (32) respectively.

4. The nuclear power plant alarm driver card with counting function according to claim 3, characterized in that: The units display unit (31) comprises a first digital tube U10 and seven first resistors R1; wherein the first digital tube U10 comprises a first common cathode and seven first anodes; The first common cathode is grounded, and each of the first anodes is connected to the driving unit (33) via the corresponding first resistor R1; The ten-digit display unit (32) comprises a second digital tube U8 and seven second resistors R2; wherein the second digital tube U8 comprises a second common cathode and seven second anodes; The second common cathode is grounded, and each of the second anodes is connected to the driving unit (33) via a corresponding second resistor R2.

5. The nuclear power plant alarm driver card with counting function according to claim 4, characterized in that: The driving unit (33) comprises: A units digit driver U11, connected to the units digit display unit (31) and the units digit counter U12, and used for driving the units digit display unit (31) according to a signal output from a count value output terminal of the units digit counter U12; and A tens-digit driver U7 is connected to the tens-digit display unit (32) and the tens-digit counter U9, and is used to drive the tens-digit display unit (32) according to a signal output from a count value output terminal of the tens-digit counter U9.

6. The nuclear power plant alarm driver card with counting function according to claim 5, characterized in that: The ones-digit driver U11 and the tens-digit driver U7 are both display driver chips of model CD4511.

7. The nuclear power plant alarm driver card with counting function according to claim 1, characterized in that: The nuclear power plant alarm drive card with counting function further comprises a current limiting unit (5) connected between the normally open contact of the relay and the ones-digit counting unit (1) and used to prevent the ones-digit counting unit (1) from being damaged by overcurrent.

8. The nuclear power plant alarm driver card with counting function according to claim 1, characterized in that: The nuclear power plant alarm drive card with counting function further comprises a power supply unit connected to the ones-digit counting unit (1), the tens-digit counting unit (2) and the display unit (3).

9. The nuclear power plant alarm driver card with counting function according to any one of claims 2 to 6, characterized in that: The ones counter U12 and the tens counter U9 are both four-bit binary calculators; The resetting unit (4) comprises: A first NAND gate, wherein a first input end thereof is connected to a second count value output end of the units counter U12, a second input end thereof is connected to a fourth count value output end of the units counter U12, and an output end thereof is connected to a reset end of the units counter U12 and a count trigger end of the tens counter U9; and The second NAND gate has a first input end connected to the second count value output end of the ten-digit counter U9, a second input end connected to the fourth count value output end of the ten-digit counter U9, and an output end connected to the reset end of the ten-digit counter U9.

10. The nuclear power plant alarm driver card with counting function according to claim 9, characterized in that: The ones-digit counter U12 and the tens-digit counter U9 are both binary counters of model SN74LS161; and / or The reset unit (4) is a NAND gate logic circuit of model CD4011, and the NAND gate logic circuit comprises four NAND gate circuits, wherein two of the NAND gate circuits correspond to the first NAND gate and the second NAND gate respectively.

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