Power tunnel water pump control circuit
By designing a power tunnel water pump control circuit with manual priority and multiple protection functions, the problem of lack of manual priority and protection functions of the water pump control circuit in the prior art is solved, and the safe and efficient operation of the water pump is achieved.
Patent Information
- Application Number
- CN201911158455.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-11-22
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2039-11-22
AI Technical Summary
The existing power tunnel water pump control circuit lacks the priority of manual operation, cannot prioritize on-site manual control when needed, and lacks protection for water pump overheating, overcurrent, overvoltage, phase deficiency and water deficiency.
A control circuit including three-phase circuit breaker, fuse, AC contactor, thermal relay, float circuit and time relay was designed to ensure that the water pump can only start when there is water in the tunnel, and it has manual and computer dual control methods, with Motor thermal protection, phase loss protection, overcurrent protection, overvoltage protection and water deficiency protection functions.
The manual operation priority is achieved, ensuring that the water pump can only start when there is water, prevent the motor from drying due to lack of water, and has multiple protection functions to ensure the safe and effective operation of the water pump.
Smart Images
Figure CN111089048B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a control circuit, in particular to a power tunnel water pump control circuit. Background Art
[0002] During the construction of power tunnels, water pumps are sometimes needed to complete the work. Generally, water pumps can only be controlled manually or by computer, or manual and computer control have equal power and no priority. Summary of the invention
[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an electric tunnel water pump control circuit with a manual operation priority characteristic.
[0004] The technical solution adopted by the present invention to solve the technical problem is:
[0005] A power tunnel water pump control circuit includes a power supply and a water pump, wherein the power supply is a three-phase AC power supply of A, B, and C, wherein the three-phase AC power supply of A, B, and C is connected to a three-phase normally open main node C of an AC contactor through a three-phase circuit breaker DK and three fuses RD1 in sequence, wherein the three-phase normally open main node C of the AC contactor is connected to the water pump, and a thermal relay RJ is provided on each of the A phase and the C phase between the three-phase normally open main node C of the AC contactor and the water pump, and the fuse RD1 is connected to the AC contactor. The B phase between the three-phase normally open main node C is connected to the red light RED through the fuse RD2, and the C phase is connected to the AC relay normally closed node C2 through the fuse RD3. The red light RED is connected in series with the AC relay normally closed node C2, and the yellow light YEW is connected in parallel with the red light RED and the AC relay normally closed node C2. One end of the yellow light YEW is connected to the 24V intermediate relay K, and the other end is connected to the intermediate relay normally closed node M1. One end of the 24V intermediate relay K is connected to the float FZ, and the other end is connected to the float FZ. The end is connected to the thermal relay RJ through the thermal relay normally closed node RJ2, and the thermal relay is connected to the other end of the intermediate relay normally closed node M1 through the AC relay power-on coil C3, the time relay KT3, the manual explosion-proof normally closed switch TA1, the computer-controlled normally open switch RA1, and the computer-controlled normally closed switch RA2 in sequence. The AC relay normally open node C1 is connected in parallel with the computer-controlled normally open switch RA1, and the green light GRN is connected in parallel with the AC relay power-on coil C3. An intermediate relay normally open node M3 is arranged between the fuse RD3 and the AC relay power-on coil C3, and an intermediate relay normally open node M2 and a time relay KT1 are connected between the fuse RD3 and the thermal relay RJ. The time relay normally closed node KT2, the manual explosion-proof normally closed switch TA2, the manual explosion-proof normally open switch QA, and the intermediate relay M4 are connected in series in sequence and then connected in parallel to the intermediate relay normally open node M2 and the time relay KT1, and the intermediate relay M5 normally open switch is connected in parallel to the manual explosion-proof normally open switch QA.
[0006] One end of the float FZ is connected to the yellow light YEW, and the other end is connected to a 24V DC voltage. The A, B, C three-phase AC power supply is connected to a 380V voltage, and one end of the 24V intermediate relay K is grounded.
[0007] The green light GRN and the red light RED are two 380V AC indicator lights. The green light GRN is lit to indicate that the water pump is running, and the red light RED is lit to indicate that the water pump is stopped. The yellow light YEW is a 24V DC indicator light, which lights up in yellow when there is no water.
[0008] The model of the time relay is JS14P, the model of the intermediate relay is MY4N, the model of the AC contactor is CJX2-0910, and the model of the thermal relay is NR2-25 / Z.
[0009] The 380V three-phase AC power on A, B, and C passes through the three-phase circuit breaker DK and the three 6A fuses RD1, and then through the three-phase normally open main node C of the AC contactor to supply power to the 1500W water pump; after closing the three-phase circuit breaker DK, a set of AC power is drawn from the B and C phases, and the control part is supplied through the two 2A fuses RD2. At this time, if there is no action, the three-phase normally open main node C of the AC contactor is in a disconnected state, and the 380V voltage cannot be added to the water pump, and the water pump does not start. At the same time, because the manual explosion-proof normally closed switch TA1 and the computer-controlled normally closed switch RA1 are in the on state, the RED indicator on the panel lights up red, telling people that the water pump is in a stopped state at this time.
[0010] If the float FZ detects that there is water in the tunnel, the water pump needs to be started. Press the manual explosion-proof normally open switch QA, and the intermediate relay M is energized. M has four single-knife double-throw contacts, among which the intermediate relay M4 is energized to complete the circuit self-protection. Even if the button is released, the passage will be maintained; the intermediate relay M3 is also energized, and it is also the passage of the main contactor. At this time, the main contactor is also energized, the water pump is activated, the normally closed node C2 of the AC relay is energized, and the normally closed node C2 of the AC relay is disconnected, the green light GRN is on, and the red light RED is off; the intermediate relay M2 is also energized, which is the starting condition of the time relay KT1. At this time, the time relay KT1 starts to work. The timing time of the time relay KT1 must be set in advance, which can be set to 1 hour, 2 hours, etc.; the intermediate relay M1 is disconnected, completing the closure of the remote control passage. At this time, the controller cannot execute even if it receives a computer command.
[0011] If you want to stop the water pump, there are two ways. One is manual stop. This method is more subjective and can be done at any time. Just press the manual explosion-proof normally closed switch TA1, the M line is disconnected, the intermediate relay M3 is disconnected, and the three-phase normally open main node C channel of the main circuit AC contactor is disconnected. The water pump stops, the intermediate relay M2 is disconnected, the time relay KT1 is reset, and the intermediate relay M1 is turned on; the second is that when the time of the time relay KT1 is set, the water pump stops working. In this method, when the time is up, the time relay KT2 is disconnected, the intermediate relay M is disconnected, and the main circuit is also disconnected.
[0012] When the water pump is not energized, computer remote operation is allowed. At this time, the computer-controlled normally closed switch RA1 is responsible for energizing, and the computer-controlled normally closed switch RA2 is responsible for disconnecting. When the computer is energized, pressing the button of the manual explosion-proof normally closed switch TA can manually shut down the computer-controlled water pump. This is mainly because TA is a double-push switch that can disconnect two paths at the same time.
[0013] When the computer is energized, in addition to disconnecting it manually, you can also "take over" the energization. Just press the manual explosion-proof normally open switch QA, the intermediate relay M will be energized, and the aforementioned time relay and other functions will be executed at the same time. The computer will no longer be able to operate the circuit. The controller will stop the water pump after the time is set by the time relay. This is why the controller has priority control.
[0014] If the thermal relay RJ detects overheating, overcurrent, overvoltage, or phase loss, the AC relay energizing coil C3 will be disconnected, causing the AC contactor to lose power and the three-phase normally open main node C of the AC contactor to be disconnected, causing the water pump to lose power and stop. In this way, it returns to the shutdown state, the green light GRN goes out, and the red light RED comes on. Only after the thermal relay RJ detects that the circuit has returned to normal, the start button and manual explosion-proof normally open switch QA are pressed again to start the water pump.
[0015] Let's talk about the float circuit. The float FZ is a passive device specially used to detect whether there is water or not. It can be regarded as a double-throw switch. When water is detected, one end of the solid-state relay is short-circuited with the common end of the float FZ, which is equivalent to grounding. The 24V intermediate relay K is turned on, and the loop is turned on. Conversely, when no water is detected, the common end of the float FZ is connected to the yellow light YEW, which is a 24V DC lamp. It is connected to the computer control board through IWC, and the computer control board controls it to light up. It is yellow when there is no water. At this time, although you can press the start water pump button, or the computer sends a command to start the water pump, the water pump will not rotate because the float circuit is not turned on and the loop loses power. Therefore, the float circuit has the highest priority and can protect the water pump. Once it is detected that there is no water, even if you press the start button, it will be useless and the water pump will not start.
[0016] The positive beneficial effects of the present invention are:
[0017] 1. The present invention can realize on-site manual start and stop operation and remote computer start and stop operation control, and when the remote computer operation is energized, the on-site manual operation can not only disconnect it, but also take over the energization. As long as the manual explosion-proof normally open switch QA is pressed, the intermediate relay M is energized, and the functions of the time relay are executed at the same time, the computer will no longer be able to operate the circuit. The controller stops the water pump after the time is set by the time relay. That is, the present invention has the characteristic of manual operation priority.
[0018] 2. The present invention has a float control function. The water pump can be started to pump water only when there is water in the tunnel, thereby preventing accidents caused by dry burning of the water pump motor when there is no water, and the pumping time of the water pump can be preset.
[0019] 3. The present invention has the functions of motor thermal protection, phase loss protection, overcurrent protection, overvoltage protection and water shortage protection. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the electric tunnel water pump control circuit of the present invention;
[0021] Figure 2 It is a construction drawing of the electric tunnel water pump control circuit of the present invention. DETAILED DESCRIPTION
[0022] The following is combined with Figure 1 , Figure 2 The present invention will be further explained and illustrated with specific embodiments:
[0023] Embodiment: A power tunnel water pump control circuit includes a power supply and a water pump, the power supply is a three-phase AC power supply of A, B, and C, the three-phase AC power supply of A, B, and C is connected to the three-phase normally open main node C of the AC contactor through a three-phase circuit breaker DK and three fuses RD1 in sequence, the three-phase normally open main node C of the AC contactor is connected to the water pump, and a thermal relay RJ is provided on the A phase and the C phase between the three-phase normally open main node C of the AC contactor and the water pump, the B phase between the fuse RD1 and the three-phase normally open main node C of the AC contactor is connected to the red light RED through the fuse RD2, the C phase is connected to the AC relay normally closed node C2 through the fuse RD3, the red light RED is connected in series with the AC relay normally closed node C2, the yellow light YEW is connected in parallel with the red light RED and the AC relay normally closed node C2, one end of the yellow light YEW is connected to the 24V intermediate relay K, and the other end is connected to the intermediate relay normally closed node M1, one end of the 24V intermediate relay K is connected to the float FZ, and the other end It is connected to the thermal relay RJ through the thermal relay normally closed node RJ2, and the thermal relay is connected to the other end of the intermediate relay normally closed node M1 through the AC relay power-on coil C3, the time relay KT3, the manual explosion-proof normally closed switch TA1, the computer-controlled normally open switch RA1, and the computer-controlled normally closed switch RA2 in sequence. The AC relay normally open node C1 is connected in parallel with the computer-controlled normally open switch RA1, the green light GRN is connected in parallel with the AC relay power-on coil C3, an intermediate relay normally open node M3 is arranged between the fuse RD3 and the AC relay power-on coil C3, an intermediate relay normally open node M2 and the time relay KT1 are connected between the fuse RD3 and the thermal relay RJ, the time relay normally closed node KT2, the manual explosion-proof normally closed switch TA2, the manual explosion-proof normally open switch QA, and the intermediate relay M4 are connected in series in sequence and then connected in parallel with the intermediate relay normally open node M2 and the time relay KT1, and the intermediate relay M5 normally open switch is connected in parallel with the manual explosion-proof normally open switch QA.
[0024] One end of the float FZ is connected to the yellow light YEW, and the other end is connected to a 24V DC voltage. The A, B, and C three-phase AC power supply is connected to a 380V voltage, and one end of the 24V intermediate relay K is grounded.
[0025] The green light GRN and the red light RED are two 380V AC indicator lights. The green light GRN is on to indicate that the water pump is running, and the red light RED is on to indicate that the water pump is stopped. The yellow light YEW is a 24V DC indicator light, which lights up yellow when there is no water.
[0026] When working, the 380V three-phase AC power on A, B, and C passes through the three-phase circuit breaker DK and the three 6A fuses RD1, and then through the three-phase normally open main node C of the AC contactor to supply power to the 1500W water pump; after closing the three-phase circuit breaker DK, a set of AC power is drawn from the two phases B and C, and the control part is supplied through the two 2A fuses RD2. At this time, if there is no action, the three-phase normally open main node C of the AC contactor is in the disconnected state, and the 380V voltage cannot be added to the water pump, and the water pump does not start. At the same time, because the manual explosion-proof normally closed switch TA1 and the computer-controlled normally closed switch RA1 are in the on state, the RED indicator on the panel lights up red, telling people that the water pump is in a stopped state at this time.
[0027] If the float FZ detects that there is water in the tunnel, the water pump needs to be started. Press the manual explosion-proof normally open switch QA, and the intermediate relay M is energized. M has four single-knife double-throw contacts, among which the intermediate relay M4 is energized to complete the circuit self-protection. Even if the button is released, the passage will be maintained; the intermediate relay M3 is also energized, and it is also the passage of the main contactor. At this time, the main contactor is also energized, the water pump is activated, the normally closed node C2 of the AC relay is energized, and the normally closed node C2 of the AC relay is disconnected, the green light GRN is on, and the red light RED is off; the intermediate relay M2 is also energized, which is the starting condition of the time relay KT1. At this time, the time relay KT1 starts to work. The timing time of the time relay KT1 must be set in advance, which can be set to 1 hour, 2 hours, etc.; the intermediate relay M1 is disconnected, completing the closure of the remote control passage. At this time, the controller cannot execute even if it receives a computer command.
[0028] If you want to stop the water pump, there are two ways. One is manual stop. This method is more subjective and can be done at any time. Just press the manual explosion-proof normally closed switch TA1, the M line is disconnected, the intermediate relay M3 is disconnected, and the three-phase normally open main node C channel of the main circuit AC contactor is disconnected. The water pump stops, the intermediate relay M2 is disconnected, the time relay KT1 is reset, and the intermediate relay M1 is turned on; the second is that when the time of the time relay KT1 is set, the water pump stops working. In this method, when the time is up, the time relay KT2 is disconnected, the intermediate relay M is disconnected, and the main circuit is also disconnected.
[0029] When the water pump is not energized, computer remote operation is allowed. At this time, the computer-controlled normally closed switch RA1 is responsible for energizing, and the computer-controlled normally closed switch RA2 is responsible for disconnecting. When the computer is energized, pressing the button of the manual explosion-proof normally closed switch TA can manually shut down the computer-controlled water pump. This is mainly because TA is a double-push switch that can disconnect two paths at the same time.
[0030] When the computer is energized, in addition to disconnecting it manually, you can also "take over" the energization. Just press the manual explosion-proof normally open switch QA, the intermediate relay M will be energized, and the aforementioned time relay and other functions will be executed at the same time. The computer will no longer be able to operate the circuit. The controller will stop the water pump after the time is set by the time relay. This is why the controller has priority control.
[0031] If the thermal relay RJ detects overheating, overcurrent, overvoltage, or phase loss, the AC relay energizing coil C3 will be disconnected, causing the AC contactor to lose power and the three-phase normally open main node C of the AC contactor to be disconnected, causing the water pump to lose power and stop. In this way, it returns to the shutdown state, the green light GRN goes out, and the red light RED comes on. Only after the thermal relay RJ detects that the circuit has returned to normal, the start button and manual explosion-proof normally open switch QA are pressed again to start the water pump.
[0032] Let's talk about the float circuit. The float FZ is a passive device specially used to detect whether there is water or not. It can be regarded as a double-throw switch. When water is detected, one end of the solid-state relay is short-circuited with the common end of the float FZ, which is equivalent to grounding. The 24V intermediate relay K is turned on, and the loop is turned on. Conversely, when no water is detected, the common end of the float FZ is connected to the yellow light YEW, which is a 24V DC lamp. It is connected to the computer control board through IWC, and the computer control board controls it to light up. It is yellow when there is no water. At this time, although you can press the start water pump button, or the computer sends a command to start the water pump, the water pump will not rotate because the float circuit is not turned on and the loop loses power. Therefore, the float circuit has the highest priority and can protect the water pump. Once it is detected that there is no water, even if you press the start button, it will be useless and the water pump will not start.
[0033] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.
Claims
1. A power tunnel water pump control circuit, comprising a power supply and a water pump, characterized in that: The power supply is a three-phase AC power supply of A, B, and C. The three-phase AC power supplies of A, B, and C are connected to the three-phase normally open main node C of the AC contactor through a three-phase circuit breaker DK and three fuses RD1 in sequence. The three-phase normally open main node C of the AC contactor is connected to a water pump. A thermal relay RJ is provided on the A phase and the C phase between the three-phase normally open main node C of the AC contactor and the water pump respectively. The B phase between the fuse RD1 and the three-phase normally open main node C of the AC contactor is connected to the red light RED through the fuse RD2. The C phase is connected to the normally closed node C2 of the AC relay through the fuse RD3. The red light RED is connected in series with the normally closed node C2 of the AC relay. The yellow light YEW is connected in parallel with the red light RED and the normally closed node C2 of the AC relay. One end of the yellow light YEW is connected to a 24V intermediate relay K, and the other end is connected to the normally closed node M1 of the intermediate relay. One end of the 24V intermediate relay K is connected to a float FZ, and the other end is connected to the normally closed node R J2 is connected to the thermal relay RJ, and the thermal relay is connected to the other end of the intermediate relay normally closed node M1 through the AC relay power-on coil C3, the time relay KT3, the manual explosion-proof normally closed switch TA1, the computer-controlled normally open switch RA1, and the computer-controlled normally closed switch RA2 in sequence. The AC relay normally open node C1 is connected in parallel with the computer-controlled normally open switch RA1, and the green light GRN is connected in parallel with the AC relay power-on coil C3. An intermediate relay normally open node M3 is arranged between the fuse RD3 and the AC relay power-on coil C3. An intermediate relay normally open node M2 and the time relay KT1 are connected between the fuse RD3 and the thermal relay RJ. The time relay normally closed node KT2, the manual explosion-proof normally closed switch TA2, the manual explosion-proof normally open switch QA, and the intermediate relay M4 are connected in series in sequence and then connected in parallel to the intermediate relay normally open node M2 and the time relay KT1. The intermediate relay M5 normally open switch is connected in parallel with the manual explosion-proof normally open switch QA.
2. The electric tunnel water pump control circuit according to claim 1 is characterized in that: One end of the float FZ is connected to the yellow light YEW, and the other end is connected to a 24V DC voltage. The A, B, C three-phase AC power supply is connected to a 380V voltage, and one end of the 24V intermediate relay K is grounded.
3. The electric tunnel water pump control circuit according to claim 1 is characterized in that: The green light GRN and the red light RED are two 380V AC indicator lights. The green light GRN is lit to indicate that the water pump is running, and the red light RED is lit to indicate that the water pump is stopped. The yellow light YEW is a 24V DC indicator light, which lights up in yellow when there is no water.
4. The electric tunnel water pump control circuit according to claim 1 is characterized in that: The model of the time relay is JS14P, the model of the intermediate relay is MY4N, the model of the AC contactor is CJX2-0910, and the model of the thermal relay is NR2-25 / Z.