Monomer water full-automatic pressure maintaining switching system

Abstract

The utility model provides a full-automatic single water pressure maintaining switching system which comprises a plurality of water pumps connected with a single water tank, the output end of each water pump is connected with a valve assembly, the valve assemblies are jointly connected with a gathering pipe, the gathering pipe is connected with a conveying pipe for conveying single water to a workshop, and the conveying pipe is connected with the single water tank. The middle part of the gathering pipe is also connected with an electro connecting pressure gauge for measuring the single water pressure in the gathering pipe; each water pump is driven by a motor, the system further comprises a plurality of circuit modules used for driving the motors to start and stop, and the circuit modules correspond to the motors one to one. And when the pressure in the gathering pipe is reduced to a set value, the control switch is switched on, so that the contactor is closed to start the standby water pump, and the problem that a production line is abnormal due to untimely operation of personnel is effectively avoided. And by automatically starting the standby water pump, normal production can be guaranteed, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of single-unit water delivery systems, and in particular to a fully automatic pressure-maintaining and switching system for single-unit water delivery. Background Technology

[0002] The monomer suction system is an essential part of nylon 6 production, directly impacting product quality and production stability. Existing monomer water systems consist of two monomer water delivery lines forming one system, such as... Figure 1 As shown, each individual water delivery line includes three water pumps 30, which are divided into two main water pumps 31 and one standby water pump 32. The outlet of each main water pump is connected to a first shut-off valve 40, and the first shut-off valve 40 is connected to a check valve 50. The check valve 50 is connected to a delivery pipe 60 for delivering individual water to the workshop. The outlet of the standby water pump 32 is connected to a branch pipe, which is connected to two second shut-off valves 70. There is a connection node between the first shut-off valve 40 and the check valve 50, and the second shut-off valve 70 is connected to the connection node.

[0003] In existing technologies, water pump switching relies entirely on manual operation. Since it is impossible to set up a duty room between individual water tanks, it is not possible to switch to a backup water pump in a timely and efficient manner when an abnormality occurs. During the intervals when the individual pump fails, abnormalities such as dyeing and unevenness of the produced products may occur, or even filament breakage and other phenomena may occur. Therefore, the automated switching of the system is particularly important. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a single-unit fully automatic pressure-maintaining and switching system that can efficiently and promptly activate the backup water pump.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a fully automatic pressure holding and switching system for individual water tanks, including a plurality of water pumps connected to individual water tanks. Each water pump has a valve assembly connected to its output end. The valve assemblies are connected to a common conduit pipe. The conduit pipe is connected to a delivery pipe that delivers individual water to the workshop. An electric contact pressure gauge for measuring the pressure of the individual water in the conduit pipe is also connected to the middle of the conduit pipe.

[0007] Each of the water pumps is driven by a motor, and the system also includes a plurality of circuit modules for driving the motor to start and stop. Each circuit module corresponds to a motor and includes a main circuit unit and a control circuit unit.

[0008] The control circuit unit includes a main contactor 3KM1, a stop button 3SB1, a start button 3SB2, a first time relay 4KT, and a star-delta switching circuit. One end of the stop button 3SB1 is connected to the live wire, and the other end of the stop button 3SB1 is connected to the start button 3SB2. One end of the main contactor 3KM1 is connected to the start button 3SB2, and the other end of the main contactor 3KM1 is connected to the neutral wire through a thermal relay FR1.

[0009] The stop button 3SB1 is connected to a control switch at the end furthest from the live wire. The control switch is electrically connected to the pressure gauge and to the first time relay 4KT. The first time relay 4KT is connected to the neutral wire. The first time relay 4KT has a delayed closing contact 4KT-1. One end of the delayed closing contact 4KT-1 is connected to the control switch, the stop button 3SB1, and the start button 3SB2. The other end of the delayed closing contact 4KT-1 is connected to the star-delta switching circuit and the main contactor 3KM1. The main contactor 3KM1 has a normally open contact 3KM1-1. One end of the normally open contact 3KM1-1 is connected between the stop button 3SB1 and the start button 3SB2, and the other end of the normally open contact 3KM1-1 is connected between the start button 3SB2 and the main contactor 3KM1.

[0010] Furthermore, one end of the star-delta switching circuit is connected to the normally open contact 3KM1-1 and the start button 3SB2, and the other end of the star-delta switching circuit is connected to the neutral line through the thermal relay FR1.

[0011] Furthermore, the star-delta switching circuit includes a star contactor 3KM3, a delta contactor 3KM2, and a second time relay 3KT. The star contactor 3KM3 has a normally closed contact 3KM3-1, the delta contactor 3KM2 has a normally closed contact 3KM2-1, and the second time relay 3KT has a delayed closing contact 3KT-1 and a delayed opening contact 3KT-2. One end of the second time relay 3KT, the delayed closing contact 3KT-1, and the delayed opening contact 3KT-2 are connected to the delayed closing contact 3KT-2. The time-delayed closing contact 4KT-1, normally open contact 3KM1-1, and start button SB2 are connected. The time-delayed closing contact 3KT-1 is connected to the normally closed contact 3KM3-1. The normally closed contact 3KM3-1 is connected to the angle contactor 3KM2. The time-delayed opening contact 3KT-2 is connected to the normally closed contact 3KM2-1. The normally closed contact 3KM2-1 is connected to the star contactor 3KM3. The star contactor 3KM3, the angle contactor 3KM2, and the second time relay are all connected to the thermal relay FR1.

[0012] Furthermore, the main circuit includes mains phases L1, L2, and L3 and circuit breaker Q1. The mains phases L1, L2, and L3 are connected to circuit breaker Q1. The main contactor 3KM1 has normally open contact 3KM1-2, the star contactor 3KM3 has normally open contact 3KM3-2, and the angle contactor 3KM2 has normally open contact 3KM2-2. The motor has terminals U1, V1, W1, V2, W2, and U2. The normally open contact 3KM1-2 is connected to terminals U1, V1, and W1. The normally open contact 3KM3-2 is connected to terminals V2, W2, and U2. One end of the normally open contact 3KM2-2 is connected to the normally open contact 3KM1-2, and the other end of the normally open contact 3KM2-2 is connected to the normally open contact 3KM3-2.

[0013] Furthermore, mechanical pressure gauges are connected to both ends of the collection tube.

[0014] Furthermore, the valve assembly includes a check valve and a shut-off valve. The check valve is connected to the outlet of the water pump, and the shut-off valve is connected to the side of the check valve away from the water pump. The shut-off valve is connected to the manifold.

[0015] Furthermore, the shut-off valve is a normally open shut-off valve.

[0016] The advantages of this invention are as follows: when the pressure in the main pipe drops to the set value, the control switch closes, causing the contactor to engage and start the standby water pump, effectively avoiding production line abnormalities caused by untimely manual operation. Automatic startup of the standby water pump ensures normal production and improves production efficiency. Furthermore, the original system required four water pumps, but now only one pump needs to be operated, saving electricity. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of a single water system structure in the prior art.

[0019] Figure 2 This is a schematic diagram of the single-unit water system structure of this utility model.

[0020] Figure 3 This is the circuit diagram of the motor control circuit unit of this utility model.

[0021] Figure 4 This is the circuit diagram of the motor main circuit unit of this utility model.

[0022] Explanation of the labels in the diagram:

[0023] 1. Water pump; 2. Valve assembly; 21. Check valve; 22. Gate valve; 3. Main pipe; 4. Delivery pipe; 5. Electrical contact pressure gauge; 6. Main circuit unit; 7. Control circuit unit; 71. Star-delta switching circuit; 8. Control switch; 9. Mechanical pressure gauge. Detailed Implementation

[0024] Please see Figures 2 to 4 This utility model provides a fully automatic pressure-maintaining and switching system for individual water tanks, including a plurality of water pumps 1 connected to individual water tanks. Each water pump 1 has a valve assembly 2 connected to its output end. The valve assemblies 2 are connected to a common conduit pipe 3 with a diameter of DN350. The conduit pipe 3 is connected to a delivery pipe 4 for conveying individual water to the workshop. There are four delivery pipes 4. The middle of the conduit pipe 3 is also connected to an electrical contact pressure gauge 5 for measuring the pressure of the individual water in the conduit pipe 3.

[0025] Each of the water pumps 1 is driven by a motor. The system also includes a plurality of circuit modules for driving the motor to start and stop. Each circuit module corresponds to a motor. Each circuit module includes a main circuit unit 6 and a control circuit unit 7.

[0026] In this invention, six water pumps 1 are provided, each driven by a separate motor. The six pumps sharing a single system improves the system's fault tolerance. Since the delivery pipe 4, which supplies individual water units to the workshop, is connected in parallel to the main pipe 3, one of the six pumps 1 is the primary pump, and the remaining pumps 1 are standby pumps. Following the startup sequence, the standby pumps are named sequentially: First Standby Pump, Second Standby Pump, Third Standby Pump, Fourth Standby Pump, and Fifth Standby Pump.

[0027] The control circuit unit 7 includes a main contactor 3KM1, a stop button 3SB1, a start button 3SB2, a first time relay 4KT, and a star-delta switching circuit 71. One end of the stop button 3SB1 is connected to the live wire, and the other end of the stop button 3SB1 is connected to the start button 3SB2. One end of the main contactor 3KM1 is connected to the start button 3SB2, and the other end of the main contactor 3KM1 is connected to the neutral wire through a thermal relay FR1.

[0028] The stop button 3SB1, located away from the live wire, is also connected to a control switch 8. This control switch 8 is electrically connected to an electrical contact pressure gauge 5. The pressure gauge 5 is connected to the control switches 8 in each circuit module via a PLC module. Based on the startup sequence of the standby water pumps, the control switches 8 are sequentially named the first control switch, the second control switch, the third control switch, the fourth control switch, and the fifth control switch. When the pressure in the collection pipe 3 is lower than the set lower limit, the PLC module first activates the first control switch to start the first standby water pump. If, 5 seconds after the first standby water pump starts, the pressure in the collection pipe 3 is still lower than the set lower limit, the PLC module activates the second control switch to start the second standby water pump (the standby water pumps are started one by one until the pressure in the collection pipe 3 reaches the set pressure value).

[0029] The control switch 8 is connected to the first time relay 4KT, which is connected to the neutral wire. The first time relay 4KT has a delayed closing contact 4KT-1. One end of the delayed closing contact 4KT-1 is connected to the control switch 8, the stop button 3SB1, and the start button 3SB2, respectively. The other end of the delayed closing contact 4KT-1 is connected to the star-delta switching circuit 71 and the main contactor 3KM1. The main contactor 3KM1 has a normally open contact 3KM1-1. One end of the normally open contact 3KM1-1 is connected between the stop button 3SB1 and the start button 3SB2, and the other end of the normally open contact 3KM1-1 is connected between the start button 3SB2 and the main contactor 3KM1.

[0030] Specifically, one end of the star-delta switching circuit 71 is also connected to the normally open contact 3KM1-1 and the start button 3SB2, and the other end of the star-delta switching circuit 71 is also connected to the neutral line through the thermal relay FR1.

[0031] Specifically, the star-delta switching circuit 71 includes a star contactor 3KM3, a delta contactor 3KM2, and a second time relay 3KT. The star contactor 3KM3 has a normally closed contact 3KM3-1, the delta contactor 3KM2 has a normally closed contact 3KM2-1, and the second time relay 3KT has a delayed closing contact 3KT-1 and a delayed opening contact 3KT-2. One end of the second time relay 3KT, the delayed closing contact 3KT-1, and the delayed opening contact 3KT-2 are connected to the delayed closing contact 3KT-2. The time-delayed closing contact 4KT-1, normally open contact 3KM1-1, and start button SB2 are connected. The time-delayed closing contact 3KT-1 is connected to the normally closed contact 3KM3-1. The normally closed contact 3KM3-1 is connected to the angle contactor 3KM2. The time-delayed opening contact 3KT-2 is connected to the normally closed contact 3KM2-1. The normally closed contact 3KM2-1 is connected to the star contactor 3KM3. The star contactor 3KM3, the angle contactor 3KM2, and the second time relay are all connected to the thermal relay FR1.

[0032] Specifically, the main circuit includes mains phases L1, L2, and L3 and circuit breaker Q1. The mains phases L1, L2, and L3 are connected to circuit breaker Q1. The main contactor 3KM1 has normally open contact 3KM1-2. The star contactor 3KM3 has normally open contact 3KM3-2. The angle contactor 3KM2 has normally open contact 3KM2-2. The motor has terminals U1, V1, W1, V2, W2, and U2. The normally open contact 3KM1-2 is connected to terminals U1, V1, and W1. The normally open contact 3KM3-2 is connected to terminals V2, W2, and U2. One end of the normally open contact 3KM2-2 is connected to the normally open contact 3KM1-2, and the other end of the normally open contact 3KM2-2 is connected to the normally open contact 3KM3-2.

[0033] Specifically, mechanical pressure gauges 9 are connected to both ends of the summing tube 3.

[0034] Specifically, the valve assembly 2 includes a check valve 21 and a shut-off valve 22. The check valve 21 is connected to the outlet of the water pump 1, and the shut-off valve 22 is connected to the side of the check valve 21 away from the water pump 1. The shut-off valve 22 is connected to the manifold 3.

[0035] Specifically, the shut-off valve 22 is a normally open shut-off valve.

[0036] One specific application of this utility model is:

[0037] When starting the main water pump, press the start button 3SB2. The coil of the main contactor 3KM1 is energized, and the normally open contacts 3KM1-1 and 3KM1-2 close. The current flows sequentially through the time-delayed disconnect contact 3KT-2, the normally closed contact 3KM2-1, and the star contactor 3KM3. The normally open contact 3KM3-2 closes, and the motor starts in a star connection. At the same time, the coil of the second time relay 3KT is also energized. After the set time is reached, the time-delayed disconnect contact 3KT-2 opens, and the time-delayed closing contact 3KT-1 closes, energizing the angle contactor 3KM2. The normally open contact 3KM2-2 closes, the star contactor 3KM3 is de-energized, and the normally open contact 3KM3-2 opens, starting the motor in a delta connection.

[0038] The startup procedure for the standby water pump is as follows:

[0039] The electric contact pressure gauge 5 detects the pressure in the collection pipe 3. When the pressure in the collection pipe 3 is lower than the lower limit of the set value, the electric contact pressure gauge 5 inputs a signal to the PLC module. The PLC module controls the control switch 8 of the first standby water pump to close, and the first time relay 4KT is energized. After the set time (5 seconds) is reached, the delayed closing contact 4KT-1 closes, the coil of the main contactor 3KM1 is energized, and the normally open contacts 3KM1-1 and 3KM1-2 close. The current passes through the delayed opening contact 3KT-2, the normally closed contact 3KM2-1 and the star contactor 3KM3 in sequence. The normally open contact 3KM3-2 closes, and the motor starts in a star connection. At the same time, the coil of the second time relay 3KT is also energized. After the set time is reached, the delayed disconnect contact 3KT-2 opens, the delayed closing contact 3KT-1 closes, energizing the angle contactor 3KM2. The normally open contact 3KM2-2 closes, the star contactor 3KM3 is de-energized, the normally open contact 3KM3-2 opens, and the motor starts in a delta connection manner.

[0040] After the first standby water pump is turned on, if the pressure in the main pipe 3 is still lower than the lower limit of the set value after 5 seconds, the PLC module controls the control switch 8 of the second standby water pump to engage, thereby starting the second standby water pump. If the set pressure value has been reached, the second standby water pump 1 will not be started. This process is repeated to start the standby water pumps one by one until the pressure in the main pipe 3 reaches the set pressure value.

[0041] In this invention, the standby water pump is started by automatic electrical control. It can automatically start in case of motor failure, ensuring normal production and improving production efficiency. After a motor failure, the pressure in the main pipe will drop. When the pressure in the main pipe drops to a set value, the control switch closes, causing the contactor to engage and start the standby water pump. This effectively avoids production line abnormalities caused by untimely human intervention.

[0042] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A fully automatic pressure-maintaining and switching system for a single water tank, comprising a plurality of water pumps connected to a single water tank, characterized in that: Each of the pumps is connected to a valve assembly at its output end. The valve assemblies are connected to a common manifold, which is connected to a delivery pipe for supplying individual water units to the workshop. An electrical contact pressure gauge for measuring the pressure of the individual water units in the manifold is also connected to the middle of the manifold. Each of the water pumps is driven by a motor, and the system also includes a plurality of circuit modules for driving the motor to start and stop. Each circuit module corresponds to a motor and includes a main circuit unit and a control circuit unit. The control circuit unit includes a main contactor 3KM1, a stop button 3SB1, a start button 3SB2, a first time relay 4KT, and a star-delta switching circuit. One end of the stop button 3SB1 is connected to the live wire, and the other end of the stop button 3SB1 is connected to the start button 3SB2. One end of the main contactor 3KM1 is connected to the start button 3SB2, and the other end of the main contactor 3KM1 is connected to the neutral wire through a thermal relay FR1. The stop button 3SB1 is connected to a control switch at the end furthest from the live wire. The control switch is electrically connected to the pressure gauge and to the first time relay 4KT. The first time relay 4KT is connected to the neutral wire. The first time relay 4KT has a delayed closing contact 4KT-1. One end of the delayed closing contact 4KT-1 is connected to the control switch, the stop button 3SB1, and the start button 3SB2. The other end of the delayed closing contact 4KT-1 is connected to the star-delta switching circuit and the main contactor 3KM1. The main contactor 3KM1 has a normally open contact 3KM1-1. One end of the normally open contact 3KM1-1 is connected between the stop button 3SB1 and the start button 3SB2, and the other end of the normally open contact 3KM1-1 is connected between the start button 3SB2 and the main contactor 3KM1.

2. The fully automatic pressure-maintaining and switching system for a single water unit as described in claim 1, characterized in that: One end of the star-delta switching circuit is also connected to the normally open contact 3KM1-1 and the start button 3SB2, and the other end of the star-delta switching circuit is also connected to the neutral line through the thermal relay FR1.

3. The fully automatic pressure-maintaining and switching system for a single water unit as described in claim 2, characterized in that: The star-delta switching circuit includes a star contactor 3KM3, a delta contactor 3KM2, and a second time relay 3KT. The star contactor 3KM3 has a normally closed contact 3KM3-1, the delta contactor 3KM2 has a normally closed contact 3KM2-1, and the second time relay 3KT has a time-delayed closing contact 3KT-1 and a time-delayed opening contact 3KT-2. One end of the second time relay 3KT, the time-delayed closing contact 3KT-1, and the time-delayed opening contact 3KT-2 are connected together for the time-delayed closing... Contact 4KT-1, normally open contact 3KM1-1, and start button SB2 are connected. The time-delayed closing contact 3KT-1 is connected to normally closed contact 3KM3-1. The normally closed contact 3KM3-1 is connected to angle contactor 3KM2. The time-delayed opening contact 3KT-2 is connected to normally closed contact 3KM2-1. The normally closed contact 3KM2-1 is connected to star contactor 3KM3. The star contactor 3KM3, angle contactor 3KM2, and second time relay are all connected to thermal relay FR1.

4. The fully automatic pressure-maintaining and switching system for a single water unit as described in claim 3, characterized in that: The main circuit includes mains phases L1, L2, and L3 and circuit breaker Q1. The mains phases L1, L2, and L3 are connected to circuit breaker Q1. The main contactor 3KM1 has normally open contact 3KM1-2. The star contactor 3KM3 has normally open contact 3KM3-2. The angle contactor 3KM2 has normally open contact 3KM2-2. The motor has terminals U1, V1, W1, V2, W2, and U2. The normally open contact 3KM1-2 is connected to terminals U1, V1, and W1. The normally open contact 3KM3-2 is connected to terminals V2, W2, and U2. One end of the normally open contact 3KM2-2 is connected to the normally open contact 3KM1-2, and the other end of the normally open contact 3KM2-2 is connected to the normally open contact 3KM3-2.

5. The fully automatic pressure-maintaining and switching system for a single water unit as described in claim 1, characterized in that: Mechanical pressure gauges are also connected to both ends of the collection tube.

6. The fully automatic pressure-maintaining and switching system for a single water unit as described in claim 1, characterized in that: The valve assembly includes a check valve and a shut-off valve. The check valve is connected to the outlet of the water pump, and the shut-off valve is connected to the side of the check valve away from the water pump. The shut-off valve is connected to the manifold.

7. The fully automatic pressure-maintaining and switching system for a single water unit as described in claim 6, characterized in that: The shut-off valve is a normally open shut-off valve.

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