Nuclear power plant sewage system and sewage discharge device thereof

Abstract

The utility model relates to a nuclear power plant sewage system and a sewage discharge device thereof. The device comprises a main water pump; a main pump control module; the liquid level measuring unit is used for measuring the liquid level of the sewage and outputting a water level signal; the instruction generating unit is connected with the liquid level measuring unit so as to receive the water level signal and output a water level alarm instruction; the alarm unit is connected with the instruction generation unit and the main pump control module so as to receive the water level alarm instruction and the fault signal output by the main pump control module and output an alarm signal; and the water pump control unit is connected with the liquid level measuring unit and the main pump control module so as to receive the water level signal and input a water pump control signal for controlling the start and stop of the main water pump to the main pump control module. According to the utility model, the water pump control signal can be output according to the sewage liquid level to automatically control the start and stop of the main water pump, and the corresponding alarm signal can be output according to the sewage liquid level, so that the fault event solving efficiency of workers can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant sewage systems, in particular to a nuclear power plant sewage system and a sewage discharge device thereof. Background Art

[0002] In some nuclear power plants, when the sewage system pump fails due to phase loss, overload, etc., although the pump control module can immediately stop the pump, the lack of an alarm prompt function makes it impossible to observe whether the alarm is triggered normally and the type of triggering during on-site searches. In addition, since most of the equipment in the system carries high voltage electricity, it may cause system operation errors or equipment damage, and even expand the scope of the fault and increase the risk of electric shock.

[0003] Furthermore, the start or stop of the water pump is generally controlled manually by staff, and the level of automation is low. It not only consumes human resources, but also has the risk of human error, which is not conducive to the safe operation of nuclear power plants. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a nuclear power plant sewage system and a sewage discharge device thereof.

[0005] The technical solution adopted by the utility model to solve the technical problem is: construct a sewage discharge device, including a main water pump and a main pump control module, and the sewage discharge device also includes:

[0006] Liquid level measuring unit, used to measure the liquid level of sewage and output water level signal;

[0007] An instruction generating unit, connected to the liquid level measuring unit, to receive the water level signal and output a water level alarm instruction;

[0008] an alarm unit connected to the instruction generation unit and the main pump control module to receive the water level alarm instruction and the fault signal output from the main pump control module and output an alarm signal; and

[0009] The water pump control unit is connected to the liquid level measurement unit and the main pump control module to receive the water level signal and input a water pump control signal for controlling the start and stop of the main water pump to the main pump control module.

[0010] Preferably, the sewage discharge device further comprises an auxiliary water pump and an auxiliary pump control module; the auxiliary pump control module is connected to the auxiliary water pump, the alarm unit and the water pump control unit.

[0011] Preferably, the liquid level measurement unit comprises a high-high liquid level switch, a high liquid level switch, a low liquid level switch and a low-low liquid level switch connected to the instruction generation unit and the water pump control unit, and used to be arranged in the sewage pool of the nuclear power plant sewage system and arranged in sequence from high to low;

[0012] Moreover, the instruction generating unit includes a first relay and a second relay; the excitation coil of the first relay is connected to the high-high liquid level switch, the first normally open circuit of the first relay is connected to the alarm unit, the excitation coil of the second relay is connected to the low-low liquid level switch, and the normally open circuit of the second relay is connected to the alarm unit.

[0013] Preferably, the alarm unit includes a high-high water level indicator light, a low-low water level indicator light, a main pump fault indicator light, an auxiliary pump fault indicator light, a main pump overload indicator light, an auxiliary pump overload indicator light, a main pump phase loss indicator light and an auxiliary pump phase loss indicator light;

[0014] The high-high water level indicator light is connected to the first normally open circuit of the first relay, the low-low water level indicator light is connected to the normally open circuit of the second relay, the main pump fault indicator light, the main pump overload indicator light and the main pump phase loss indicator light are connected to the main pump control module, and the auxiliary pump fault indicator light, the auxiliary pump overload indicator light and the auxiliary pump phase loss indicator light are connected to the auxiliary pump control module.

[0015] Preferably, the alarm unit further includes a main pump operation indicator light, a secondary pump operation indicator light, a main pump stop indicator light, a secondary pump stop indicator light, a third relay and a fourth relay;

[0016] The excitation coil of the third relay is connected to the water pump control unit, the first normally open circuit of the third relay is connected to the main pump operation indicator light, and the normally closed circuit of the third relay is connected to the main pump stop indicator light;

[0017] The excitation coil of the fourth relay is connected to the water pump control unit, the first normally open circuit of the fourth relay is connected to the auxiliary pump operation indicator light, and the normally closed circuit of the third relay is connected to the auxiliary pump shutdown indicator light.

[0018] Preferably, the water pump control unit includes a fifth relay, a sixth relay, a seventh relay and a rotation switch unit;

[0019] The first end of the normally closed circuit of the fifth relay is connected to the second end of the high liquid level switch via the first normally closed circuit of the sixth relay, the first end of the high liquid level switch is connected to the DC voltage via the low liquid level switch, the second end of the normally closed circuit of the fifth relay is connected to the main pump control module and connected to the ground via the excitation coil of the third relay, the excitation coil of the fifth relay is connected to the auxiliary pump control module to excite when the auxiliary water pump is running;

[0020] The first end of the normally closed circuit of the seventh relay is connected to the second end of the high liquid level switch via the normally open circuit of the sixth relay, the second end of the normally closed circuit of the seventh relay is connected to the auxiliary pump control module and connected to the ground via the excitation coil of the fourth relay, and the excitation coil of the seventh relay is connected to the main pump control module to excite when the main water pump is running;

[0021] The first end of the high liquid level switch is connected to the second end of the normally closed circuit of the fifth relay through the second normally open circuit of the third relay, and is connected to the second end of the normally closed circuit of the seventh relay through the second normally open circuit of the fourth relay;

[0022] The excitation coil of the sixth relay is connected to the main pump control module and the auxiliary pump control module to control the excitation of the sixth relay after the main water pump is started.

[0023] Preferably, the water pump control unit further includes a tenth relay and an eleventh relay;

[0024] The first end of the normally open circuit of the tenth relay is connected to the second end of the high liquid level switch, the second end of the normally open circuit of the tenth relay is connected to the second end of the normally closed circuit of the fifth relay, the normally closed circuit of the tenth relay is connected between the second end of the normally closed circuit of the seventh relay and the auxiliary pump control module, and the excitation coil of the tenth relay is connected to the main pump control module;

[0025] The first end of the normally open circuit of the eleventh relay is connected to the second end of the high liquid level switch, the second end of the normally open circuit of the eleventh relay is connected to the second end of the normally closed circuit of the seventh relay, the normally closed circuit of the eleventh relay is connected between the second end of the normally closed circuit of the fifth relay and the main pump control module, and the excitation coil of the eleventh relay is connected to the auxiliary pump control module.

[0026] Preferably, the second normally open circuit included in the first relay is connected between the second end of the normally closed circuit of the fifth relay and the second end of the normally closed circuit of the seventh relay.

[0027] Preferably, the water pump control unit further comprises a first selection switch and a second selection switch;

[0028] The first moving contact of the first selection switch and the first moving contact of the second selection switch are connected to a DC voltage, the second moving contact of the first selection switch and the second moving contact of the second selection switch are suspended, the third moving contact of the first selection switch is connected to the second end of the normally closed circuit of the fifth relay, the third moving contact of the second selection switch is connected to the second end of the normally closed circuit of the seventh relay, the fixed contact of the first selection switch is connected to the main pump control module, and the fixed contact of the second selection switch is connected to the auxiliary pump control module.

[0029] The utility model also constructs a nuclear power plant sewage system, which comprises the sewage discharge device mentioned above.

[0030] The implementation of the utility model has the following beneficial effects: a water pump control signal can be output according to the sewage liquid level to realize automatic control of the start and stop of the main water pump and reduce the demand for human resources; and a corresponding alarm signal can be output according to the sewage liquid level to indicate the type of water pump failure, thereby effectively improving the efficiency of staff in resolving failure events and the safety of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0032] Figure 1 It is a structural block diagram of a sewage discharge device in some embodiments of the utility model;

[0033] Figure 2 It is a schematic diagram of the structure in which the liquid level measuring unit is arranged in the sewage pool in some embodiments of the utility model;

[0034] Figure 3 is a circuit schematic diagram of an instruction generation unit in some embodiments of the utility model;

[0035] Figure 4 is a circuit schematic diagram of an alarm unit in some embodiments of the utility model;

[0036] Figure 5 is a circuit schematic diagram of a water pump control unit in some embodiments of the utility model;

[0037] Figure 6 It is a circuit schematic diagram of the main pump control module and the auxiliary pump control module in some embodiments of the utility model. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] See also Figure 1 The utility model provides a sewage discharge device, which is used to discharge sewage from a sewage pool in a sewage system of a nuclear power plant. The device includes a main water pump 10, a main pump control module 20, a liquid level measurement unit 1, an instruction generation unit 2, an alarm unit 3 and a water pump control unit 4.

[0041] The main water pump 10 may be an existing electric water pump, which is not limited here.

[0042] The main pump control module 20 may be an existing water pump control module or circuit, such as a water pump control module in an existing nuclear power plant sewage system, and is not limited here as long as it can control the main water pump 10 to be powered on or off.

[0043] The liquid level measuring unit 1 is used to measure the sewage level in the sewage pool to output a water level signal that can represent the height of the sewage level.

[0044] The instruction generation unit 2 is connected to the liquid level measurement unit 1 to receive the water level signal and output the water level alarm instruction. Specifically, when the sewage level reaches a high-high level or drops to a low-low level, the instruction generation unit 2 will output the corresponding water level alarm instruction, including a high-high level alarm instruction and a low-low level alarm instruction.

[0045] The alarm unit 3 is connected to the instruction generation unit 2 and the main pump control module 20 to receive the water level alarm instruction and the fault signal output from the main pump control module 20, and output the alarm signal. Specifically, the alarm unit 3 can output a corresponding alarm signal based on the type of the received water level alarm instruction and the fault signal. Among them, the fault signal output by the main pump control module 20 can include at least one of a pump phase loss signal, a pump overload signal and a pump fault signal. In addition, the alarm signal can be a light alarm signal, a sound alarm signal or a sound and light alarm signal.

[0046] The water pump control unit 4 is connected to the liquid level measurement unit 1 and the main pump control module 20 to receive the water level signal, and input the water pump control signal for controlling the start and stop of the main water pump 10 to the main pump control module 20. Specifically, the water pump control unit 4 can know the current liquid level of the sewage according to the water level signal. When the liquid level is higher than a certain height, the water pump control unit 4 will output a water pump control signal that can control the start of the main water pump to discharge the sewage in the sewage pool, until the liquid level drops to a certain value, then it can output a water pump control signal that can control the main water pump to stop.

[0047] In this embodiment, the sewage discharge device can output a water pump control signal according to the sewage liquid level to realize automatic control of the start and stop of the main water pump and reduce the demand for human resources; it can also output a corresponding alarm signal according to the sewage liquid level to indicate the type of water pump failure, effectively improving the efficiency of staff in resolving failure events and the safety of the nuclear power plant.

[0048] In some embodiments, Figure 1 As shown, the sewage discharge device also includes an auxiliary water pump 5 and an auxiliary pump control module 6. The auxiliary pump control module 6 is connected to the auxiliary water pump 5, the alarm unit 3 and the water pump control unit 4. In this embodiment, the auxiliary water pump 5 is a redundant device of the main water pump 10, and can replace the auxiliary water pump 5 when the main water pump 10 fails, which can further improve the reliability and stability of the device. In addition, the auxiliary water pump 5 and the main water pump 10 can be water pumps of the same model, and accordingly, the auxiliary pump control module 6 and the main pump control module 20 also use water pump control modules or circuits of the same model or circuit structure.

[0049] In some embodiments, Figure 2 As shown, the liquid level measurement unit 1 includes a high-high liquid level switch 11, a high liquid level switch 12, a low liquid level switch 13 and a low-low liquid level switch 14, which are connected to the instruction generation unit 2 and the water pump control unit 4 and are used to be set in the sewage pool of the nuclear power plant sewage system and are arranged in sequence from high to low. Specifically, the positions where the high-high liquid level switch 11, the high liquid level switch 12, the low liquid level switch 13 and the low-low liquid level switch 14 are arranged in sequence correspond to the high-high liquid level, the high liquid level, the low liquid level and the low-low liquid level with decreasing heights in sequence, and when the sewage liquid level is immersed in a certain liquid level switch, the liquid level switch at this position will be closed, and then the corresponding water level signal will be output. Taking the high-high liquid level switch 11 as an example, assuming that one end of the high-high liquid level switch 11 is connected to a high level, when the sewage liquid level is immersed in the high-high liquid level switch 11, due to the closure of the high-high liquid level switch 11, the other end of the high-high liquid level switch 11 will output a high level. It can be understood that the high-level signal can represent that the current liquid level of the sewage has reached the high-high liquid level.

[0050] Optionally, the high-high liquid level switch 11 , the high liquid level switch 12 , the low liquid level switch 13 and the low-low liquid level switch 14 are liquid level switches of model LPF-A3.15.

[0051] Furthermore, if Figure 3 and Figure 4 As shown, the instruction generating unit 2 may include a first relay 21 and a second relay 22. One end of the excitation coil of the first relay 21 is grounded, and the other end is connected to a DC voltage via a high-high liquid level switch 11, and the first normally open circuit of the first relay 21 is connected to the alarm unit 3, one end of the excitation coil of the second relay 22 is grounded, and the other end is connected to a DC voltage via a low-low liquid level switch 14, and the normally open circuit of the second relay 22 is connected to the alarm unit 3.

[0052] In some embodiments, Figure 4 As shown, the alarm unit 3 includes a high-high water level indicator light 31, a low-low water level indicator light 32, a main pump fault indicator light 33, an auxiliary pump fault indicator light 34, a main pump overload indicator light 35, an auxiliary pump overload indicator light 36, a main pump phase loss indicator light 37 and an auxiliary pump phase loss indicator light 38. One end of the high-high water level indicator light 31 is grounded, and the other end is connected to a DC voltage via a first normally open circuit of the first relay 21, one end of the low-low water level indicator light 32 is grounded, and the other end is connected to a DC voltage via a normally open circuit of the second relay 22, the main pump fault indicator light 33, the main pump overload indicator light 35 and the main pump phase loss indicator light 37 are connected to the main pump control module 20 to receive relevant fault signals (including a main pump overload signal, a main pump phase loss signal and a main pump fault signal), and the auxiliary pump fault indicator light 34, the auxiliary pump overload indicator light 36 and the auxiliary pump phase loss indicator light 38 are connected to the auxiliary pump control module 6 to receive relevant fault signals (including an auxiliary pump overload signal, an auxiliary pump phase loss signal and an auxiliary pump fault signal).

[0053] In this embodiment, when a certain indicator light is powered, it will output a corresponding light alarm signal, thereby achieving an alarm effect. Taking the high-high water level indicator light 31 as an example, when the sewage submerges the high-high liquid level switch 11 to close it, the first relay 21 is energized to close its normally open circuit, thereby lighting up the high-high water level indicator light 31. For the fault signal output by the main pump control module 20 or the auxiliary pump control module 6, taking the main pump phase failure as an example, the main pump control module 20 will output a high-level main pump phase failure signal (i.e., a fault signal) to the main pump phase failure indicator light 37, thereby lighting up the main pump phase failure indicator light 37.

[0054] In some embodiments, Figure 4 As shown, the alarm unit 3 also includes a main pump operation indicator light 39 , an auxiliary pump operation indicator light 301 , a main pump stop indicator light 302 , an auxiliary pump stop indicator light 303 , a third relay 304 and a fourth relay 305 .

[0055] The excitation coil of the third relay 304 is connected to the water pump control unit 4, one end of the first normally open circuit of the third relay 304 is connected to the DC voltage, and the other end is connected to the main pump operation indicator light 39, one end of the normally closed circuit of the third relay 304 is connected to the DC voltage, and the other end is connected to the main pump stop indicator light 302, the excitation coil of the fourth relay 305 is connected to the water pump control unit 4, one end of the first normally open circuit of the fourth relay 305 is connected to the DC voltage, and the other end is connected to the auxiliary pump operation indicator light 301, one end of the normally closed circuit of the third relay 304 is connected to the DC voltage, and the other end is connected to the auxiliary pump stop indicator light 303.

[0056] In some embodiments, Figure 5 As shown, the water pump control unit 4 includes a fifth relay 41 , a sixth relay 42 , a seventh relay 43 and a rotation switch unit 44 .

[0057] Specifically, Figure 5 and Figure 6 As shown, the first end of the normally closed circuit of the fifth relay 41 is connected to the second end of the high liquid level switch 12 via the first normally closed circuit of the sixth relay 42, the first end of the high liquid level switch 12 is connected to the DC voltage via the low liquid level switch 13, the second end of the normally closed circuit of the fifth relay 41 is connected to the main pump control module 20, and is connected to the ground via the excitation coil of the third relay 304, and the excitation coil of the fifth relay 41 is connected to the auxiliary pump control module 6 to excite when the auxiliary water pump 5 is running;

[0058] The first end of the normally closed circuit of the seventh relay 43 is connected to the second end of the high liquid level switch 12 via the normally open circuit of the sixth relay 42, the second end of the normally closed circuit of the seventh relay 43 is connected to the auxiliary pump control module 6, and is connected to the ground via the excitation coil of the fourth relay 305, and the excitation coil of the seventh relay 43 is connected to the main pump control module 20 to be excited when the main water pump 10 is running;

[0059] The first end of the high liquid level switch 12 is connected to the second end of the normally closed circuit of the fifth relay 41 through the second normally open circuit of the third relay 304, and is connected to the second end of the normally closed circuit of the seventh relay 43 through the second normally open circuit of the fourth relay 305.

[0060] The excitation coil of the sixth relay 42 is connected to the main pump control module 20 and the auxiliary pump control module 6 to control the excitation of the sixth relay 42 after the main water pump 10 is started.

[0061] In some embodiments, Figure 5As shown, the water pump control unit 4 further includes a tenth relay 47 and an eleventh relay 48 . The first end of the normally open circuit of the tenth relay 47 is connected to the second end of the high liquid level switch 12, the second end of the normally open circuit of the tenth relay 47 is connected to the second end of the normally closed circuit of the fifth relay 41, the normally closed circuit of the tenth relay 47 is connected between the second end of the normally closed circuit of the seventh relay 43 and the auxiliary pump control module 6 to disconnect the power supply of the main water pump 10 when the tenth relay 47 is energized, and the excitation coil of the tenth relay 47 is connected to the main pump control module 20 and is energized when the auxiliary water pump 5 fails; the first end of the normally open circuit of the eleventh relay 48 is connected to the second end of the high liquid level switch 12, the second end of the normally open circuit of the eleventh relay 48 is connected to the second end of the normally closed circuit of the seventh relay 43, the normally closed circuit of the eleventh relay 48 is connected between the second end of the normally closed circuit of the fifth relay 41 and the main pump control module 20 to disconnect the power supply of the auxiliary water pump 5 when the eleventh relay 48 is energized, and the excitation coil of the eleventh relay 48 is connected to the auxiliary pump control module 6 and is energized when the main water pump 10 fails.

[0062] See also Figure 5 and Figure 6 The principle of the water pump control unit 4 automatically controlling the start and stop of the main water pump 10 and the auxiliary water pump 5 is as follows (the first selection switch 411 is turned to the right, and the second selection switch 412 is turned to the left):

[0063] When the sewage level is higher than the high level, the normally closed circuit of the sixth relay 42 and the fifth relay 41 will excite the relay 7001XU and the third relay 304. The excitation of the relay 7001XU will cause it to Figure 6 The normally open circuit A of (relay 7001XU) is closed to energize relay 7001UJ, thereby energizing the main water pump 10 (i.e., motor M1), and the excitation of the third relay 304 will close its second normally open circuit. At the same time, Figure 6 As shown, when the relay 7001UJ is energized, the seventh relay 43 is also energized, which will disconnect the normally closed circuit of the seventh relay 43 to prevent the auxiliary water pump 5 from running when the main water pump 10 does not fail; in addition, the excitation of the relay 7001XU will also cause it Figure 5 The normally open circuit B of (relay 7001XU) is closed, and finally the sixth relay 42 is excited. At this time, although the normally closed circuit of the sixth relay 42 is disconnected, the third relay 304 is already excited, which will keep the relay 7001XU excited. At the same time, the first and second normally closed circuits of the third relay 304 are closed. The first normally closed circuit of the third relay 304 is closed, but the auxiliary water pump 5 will not be started at this time because the seventh relay 43 is excited. In addition, the second normally closed circuit of the third relay 304 is closed, which will keep the third relay 304 excited.

[0064] If the main water pump 10 fails, the normally closed circuit of the eleventh relay 48 will be disconnected due to the excitation of the eleventh relay 48, thereby demagnetizing the relay 7001XU and the seventh relay 43, which will not only cut off the power supply of the main water pump 10, but also cause the excitation of the sixth relay 42 and the demagnetization of the seventh relay 43, so that the second end of the normally closed circuit of the seventh relay 43 can output a high level to the auxiliary pump control module 6, so as to start the auxiliary water pump 5;

[0065] When the sewage is discharged to a level lower than the low level, the low level switch 13 is disconnected, which will cause the entire water pump control unit 4 to lose power, causing the relay 7001XU and the relay 7003XU to lose magnetism, that is, the main water pump 10 and the auxiliary water pump 5 cannot be started.

[0066] In some embodiments, Figure 5 As shown, the first relay 21 also includes a second normally open circuit. Specifically, the second normally open circuit of the first relay 21 is connected between the second end of the normally closed circuit of the fifth relay 41 and the second end of the normally closed circuit of the seventh relay 43. In this embodiment, see Figure 3 It can be seen that when the sewage level reaches the high-high level, (as can be seen from the previous text) the second end of the normally closed circuit of the fifth relay 41 is at a high level. Since the second normally open circuit of the first relay 21 is closed, the second end of the normally closed circuit of the seventh relay 43 will also be set to a high level, so the relay 7001XU and the relay 7003XU will be excited at the same time, that is, the main water pump 10 and the auxiliary water pump 5 will start at the same time, thereby accelerating the discharge of sewage and preventing sewage from overflowing the sewage pool. It should be noted that the operating condition of the main water pump 10 and the auxiliary water pump 5 being started at the same time is mainly to cope with the special operating condition of a sharp increase in sewage, because under normal circumstances, the sewage level will not rise to the high-high level. In addition, when the liquid level is lower than the high-high level, the first relay 21 will lose magnetism, and then the auxiliary water pump 5 will stop operating.

[0067] In some embodiments, Figure 5 As shown, the water pump control unit 4 also includes a first selection switch 411 and a second selection switch 412. The first moving contact of the first selection switch 411 and the first moving contact of the second selection switch 412 are connected to a DC voltage, the second moving contact of the first selection switch 411 and the second moving contact of the second selection switch 412 are suspended, the third moving contact of the first selection switch 411 is connected to the second end of the normally closed circuit of the fifth relay 41, the third moving contact of the second selection switch 412 is connected to the second end of the normally closed circuit of the seventh relay 43, the fixed contact of the first selection switch 411 is connected to the main pump control module 20, and the fixed contact of the second selection switch 412 is connected to the auxiliary pump control module 6.

[0068] In this embodiment, when the first selection switch 411 is turned to the left, its first moving contact and fixed contact are closed, which will excite the relay 7001XU, thereby starting the main water pump 10, that is, the manual control of starting the main water pump 10 can be realized; when the first selection switch 411 is turned to the middle position, its second moving contact and fixed contact are closed, which will keep the relay 7001XU demagnetized, thereby stopping the main water pump 10, that is, the manual control of stopping the main water pump 10 can be realized; when the first selection switch 411 is turned to the right, its third moving contact and fixed contact are closed, at this time, the start and stop of the main water pump 10 is controlled by the main pump control module 20, and the start and stop of the main water pump 10 can be automatically controlled according to the sewage level. In view of the fact that the working principle of the second selection switch 412 is similar to that of the first selection switch 411, it will not be repeated here.

[0069] In some embodiments, Figure 6 As shown, the main pump control module 20 and the auxiliary pump control module 6 respectively include a controller (70001UC and 70002UC) of model BL-485L, a plurality of current transformers that cooperate with the controller to monitor the working current of the main water pump 10 (corresponding to the motor M1) and the auxiliary water pump 5 (corresponding to the motor M2), a circuit breaker (circuit breaker 7001KK and 7002KK) and a relay (relay 7001UJ and 7002UJ) that controls the main water pump 10 and the auxiliary water pump 5, and the specific circuit structure of the main pump control module 20 and the auxiliary pump control module 6 can be found in Figure 6 That's it.

[0070] In addition, the DC voltage can be a 12V DC voltage, which can be obtained by Figure 6 The power supply board in the embodiment can also provide the power supply by the existing voltage conversion circuit, which is not limited here.

[0071] The utility model also provides a nuclear power plant sewage system, including the sewage discharge device provided in the embodiment of the utility model.

[0072] 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 sewage discharge device, comprising a main water pump (10) and a main pump control module (20), characterized in that: The sewage discharge device also includes: A liquid level measuring unit (1), used to measure the liquid level of sewage and output a water level signal; An instruction generating unit (2) is connected to the liquid level measuring unit (1) to receive the water level signal and output a water level alarm instruction; an alarm unit (3), connected to the instruction generation unit (2) and the main pump control module (20), to receive the water level alarm instruction and a fault signal output from the main pump control module (20), and to output an alarm signal; and A water pump control unit (4) is connected to the liquid level measurement unit (1) and the main pump control module (20) to receive the water level signal and input a water pump control signal for controlling the start and stop of the main water pump (10) to the main pump control module (20).

2. The sewage discharge device according to claim 1, characterized in that: The sewage discharge device further comprises an auxiliary water pump (5) and an auxiliary pump control module (6); the auxiliary pump control module (6) is connected to the auxiliary water pump (5), the alarm unit (3) and the water pump control unit (4).

3. The sewage discharge device according to claim 2, characterized in that: The liquid level measurement unit (1) comprises a high-high liquid level switch (11), a high liquid level switch (12), a low liquid level switch (13) and a low-low liquid level switch (14) which are connected to the instruction generation unit (2) and the water pump control unit (4) and are used to be arranged in a sewage pool of a nuclear power plant sewage system and are arranged in sequence from high to low; Furthermore, the instruction generating unit (2) comprises a first relay (21) and a second relay (22); the excitation coil of the first relay (21) is connected to the high-high liquid level switch (11), the first normally open circuit of the first relay (21) is connected to the alarm unit (3), the excitation coil of the second relay (22) is connected to the low-low liquid level switch (14), and the normally open circuit of the second relay (22) is connected to the alarm unit (3).

4. The sewage discharge device according to claim 3, characterized in that: The alarm unit (3) comprises a high-high water level indicator light (31), a low-low water level indicator light (32), a main pump fault indicator light (33), an auxiliary pump fault indicator light (34), a main pump overload indicator light (35), an auxiliary pump overload indicator light (36), a main pump phase loss indicator light (37) and an auxiliary pump phase loss indicator light (38); The high-high water level indicator light (31) is connected to the first normally open circuit of the first relay (21), the low-low water level indicator light (32) is connected to the normally open circuit of the second relay (22), the main pump fault indicator light (33), the main pump overload indicator light (35) and the main pump phase loss indicator light (37) are connected to the main pump control module (20), and the auxiliary pump fault indicator light (34), the auxiliary pump overload indicator light (36) and the auxiliary pump phase loss indicator light (38) are connected to the auxiliary pump control module (6).

5. The sewage discharge device according to claim 4, characterized in that: The alarm unit (3) further comprises a main pump operation indicator light (39), an auxiliary pump operation indicator light (301), a main pump stop indicator light (302), an auxiliary pump stop indicator light (303), a third relay (304) and a fourth relay (305); The excitation coil of the third relay (304) is connected to the water pump control unit (4), the first normally open circuit of the third relay (304) is connected to the main pump operation indicator light (39), and the normally closed circuit of the third relay (304) is connected to the main pump stop indicator light (302); The excitation coil of the fourth relay (305) is connected to the water pump control unit (4), the first normally open circuit of the fourth relay (305) is connected to the auxiliary pump operation indicator light (301), and the normally closed circuit of the third relay (304) is connected to the auxiliary pump stop indicator light (303).

6. The sewage discharge device according to claim 5, characterized in that: The water pump control unit (4) comprises a fifth relay (41), a sixth relay (42), a seventh relay (43) and a rotation switch unit (44); The first end of the normally closed circuit of the fifth relay (41) is connected to the second end of the high liquid level switch (12) via the first normally closed circuit of the sixth relay (42); the first end of the high liquid level switch (12) is connected to a DC voltage via the low liquid level switch (13); the second end of the normally closed circuit of the fifth relay (41) is connected to the main pump control module (20) and is connected to the ground via the excitation coil of the third relay (304); the excitation coil of the fifth relay (41) is connected to the auxiliary pump control module (6) to excite when the auxiliary water pump (5) is running; The first end of the normally closed circuit of the seventh relay (43) is connected to the second end of the high liquid level switch (12) via the normally open circuit of the sixth relay (42); the second end of the normally closed circuit of the seventh relay (43) is connected to the auxiliary pump control module (6) and is connected to the ground via the excitation coil of the fourth relay (305); the excitation coil of the seventh relay (43) is connected to the main pump control module (20) to excite when the main water pump (10) is running; The first end of the high liquid level switch (12) is connected to the second end of the normally closed circuit of the fifth relay (41) via the second normally open circuit of the third relay (304), and is connected to the second end of the normally closed circuit of the seventh relay (43) via the second normally open circuit of the fourth relay (305); The excitation coil of the sixth relay (42) is connected to the main pump control module (20) and the auxiliary pump control module (6) to control the excitation of the sixth relay (42) after the main water pump (10) is started.

7. The sewage discharge device according to claim 6, characterized in that: The water pump control unit (4) further comprises a tenth relay (47) and an eleventh relay (48); The first end of the normally open circuit of the tenth relay (47) is connected to the second end of the high liquid level switch (12), the second end of the normally open circuit of the tenth relay (47) is connected to the second end of the normally closed circuit of the fifth relay (41), the normally closed circuit of the tenth relay (47) is connected between the second end of the normally closed circuit of the seventh relay (43) and the auxiliary pump control module (6), and the excitation coil of the tenth relay (47) is connected to the main pump control module (20); The first end of the normally open circuit of the eleventh relay (48) is connected to the second end of the high liquid level switch (12), the second end of the normally open circuit of the eleventh relay (48) is connected to the second end of the normally closed circuit of the seventh relay (43), the normally closed circuit of the eleventh relay (48) is connected between the second end of the normally closed circuit of the fifth relay (41) and the main pump control module (20), and the excitation coil of the eleventh relay (48) is connected to the auxiliary pump control module (6).

8. The sewage discharge device according to claim 7, characterized in that: The second normally open circuit included in the first relay (21) is connected between the second end of the normally closed circuit of the fifth relay (41) and the second end of the normally closed circuit of the seventh relay (43).

9. The sewage discharge device according to claim 6, characterized in that: The water pump control unit (4) further comprises a first selection switch (411) and a second selection switch (412); The first moving contact of the first selection switch (411) and the first moving contact of the second selection switch (412) are connected to a DC voltage, the second moving contact of the first selection switch (411) and the second moving contact of the second selection switch (412) are suspended, the third moving contact of the first selection switch (411) is connected to the second end of the normally closed circuit of the fifth relay (41), the third moving contact of the second selection switch (412) is connected to the second end of the normally closed circuit of the seventh relay (43), the fixed contact of the first selection switch (411) is connected to the main pump control module (20), and the fixed contact of the second selection switch (412) is connected to the auxiliary pump control module (6).

10. A nuclear power plant sewage system, characterized in that: Comprising the sewage discharge device as described in any one of claims 1 to 9.

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