Automatic water adding device for cold water tank of wire and cable irradiation accelerator

Abstract

The invention discloses an automatic water adding device for a cold water tank of an electric wire and cable irradiation accelerator, and belongs to the technical field of cable production equipment.The automatic water adding device comprises the cold water tank, a water pump, a water inlet pipeline, an electromagnetic valve, a sensing assembly and a control system, the sensing assembly comprises a liquid level sensor and a pressure sensor, and the pressure sensor is installed on the water inlet pipeline; the pressure sensor can detect water supply pressure and output analog signals; signals detected by the liquid level sensor can be transmitted into the control system, the control system can control the electromagnetic valve, and when the liquid level is low, water adding is automatically started, and when the liquid level is high, water adding is automatically stopped; the control system can receive signals of the pressure sensor. According to the invention, the liquid level sensor is arranged and forms an interlocking loop with the relay, so that the functions of automatically starting water replenishing at a low liquid level and automatically stopping water replenishing at a high liquid level are realized, the manual water adding requirement is reduced, shutdown caused by manual water adding is avoided, and the continuous operation capability of equipment is improved.

Description

Technical Field

[0001] This invention relates to an automatic water filling device for the cold water tank of an irradiation accelerator for electric wires and cables, belonging to the technical field of cable production equipment. Background Technology

[0002] In the cooling system of an irradiation accelerator room, a chilled water tank provides circulating cooling water for the main accelerator equipment. The chilled water tank is often coupled with the accelerator cooling circuit, heat exchanger, and pump set, and needs to maintain a stable and appropriate water level and supply pressure over a long period of time to ensure the continuous and safe operation of the accelerator under high load conditions.

[0003] Currently, the main method for replenishing cold water tanks is manual water replacement. Some systems use on-site pure water machines to supply cold water to the tanks, while others use a combination of PLC / relay and frequency converter to realize pump start-up and stop and variable frequency speed regulation, as well as closed-loop control using pressure or flow sensors.

[0004] The existing technology has certain drawbacks. Manual water addition is labor-intensive and requires machine shutdown, affecting equipment continuity. Simple float or no closed-loop pressure control can lead to water supply shock, water hammer or pump dry running, and the detection is not sensitive. The lack of reliable fault interlock and sequence control increases the risk of equipment failure and maintenance costs.

[0005] Therefore, an automatic water filling device is needed for the cold water tank of the wire and cable irradiation accelerator to solve the above problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an automatic water filling device for the cold water tank of a wire and cable irradiation accelerator, which solves the problems of needing to stop the machine when manually adding water, insensitive detection, and unsafe control.

[0007] The technical problem to be solved by this invention is achieved by the following technical solution: an automatic water filling device for the cold water tank of a wire and cable irradiation accelerator. Includes cold water tank, water pump, inlet pipe, solenoid valve, sensor components, and control system. The sensing components include a liquid level sensor and a pressure sensor. The pressure sensor is installed on the water inlet pipe and can detect the water supply pressure and output an analog signal. The signal detected by the liquid level sensor can be transmitted to the control system, which can control the solenoid valve to automatically open for water supply when the liquid level is low and automatically stop for water supply when the liquid level is high. The control system is able to receive signals from the pressure sensor.

[0008] Preferably, the control system includes a frequency converter, indicator lights, a switching power supply, and a control device. The indicator lights can display the status of the frequency converter, and the control device can control the frequency converter.

[0009] Preferably, the switching power supply can power the level sensor and the pressure sensor.

[0010] Preferably, the liquid level sensor includes a high liquid level detector and a low liquid level detector, which correspond to the upper limit water level and lower limit water level of the cold water tank, respectively; the high liquid level detector and the low liquid level detector are interlocked through a relay.

[0011] Preferably, the solenoid valve is driven by the relay in an isolated manner, and the solenoid valve opens or closes synchronously with the start / stop signal of the water pump.

[0012] Preferably, the pressure sensor outputs a signal to the frequency converter, and the frequency converter controls the solenoid valve according to the output signal.

[0013] Preferably, the control system is equipped with a running indicator light, a power indicator light, and a solenoid valve running indicator light, which can display the operating status.

[0014] Preferably, the on / off state of the water pump and the solenoid valve is controlled by a switch.

[0015] Preferably, the cold water tank can be connected to a remote pure water delivery system, enabling automatic replenishment of pure water through a long-distance water supply pipeline.

[0016] Preferably, at least one cold water tank is provided; each cold water tank is equipped with a sensing component.

[0017] The beneficial effects of this invention are: This invention incorporates a liquid level sensor that forms an interlocked circuit with a relay, enabling automatic water replenishment when the liquid level is low and automatic water replenishment to stop when the liquid level is high. This reduces the need for manual water replenishment, avoids downtime due to manual water replenishment, and improves the continuous operation capability of the equipment.

[0018] Through this invention, a water pump and a corresponding control system are installed in the cold water tank. The control system can adjust the water pump according to the data detected by the sensor, which can reduce the labor intensity of workers and can stop the machine when adding water.

[0019] This invention incorporates a frequency converter that transmits pressure from the pipeline pressure sensor to the frequency converter, enabling real-time adjustment of the water pump speed to maintain a constant water supply pressure. This suppresses water supply shock and water hammer, prevents pump idling or instantaneous overpressure, and improves water supply stability and system lifespan. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the present invention.

[0021] Figure 2 This is a diagram of the control box of the present invention.

[0022] Figure 3 This is the layout of electrical components within the control box of the present invention.

[0023] In the diagram: 1-Run indicator light, 2-Solenoid valve run indicator light one, 3-Solenoid valve run indicator light two, 4-Main switch, 5-Solenoid valve starting device, 6-Power indicator light, 7-Automatic / Stop / Manual selector switch, 8-Inverter, 9-Air switch, 10-Switching power supply, 11-Contactor, 12-Fuse, 13-Relay, 14-Terminal block. Detailed Implementation

[0024] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this invention, the invention will be further described below in conjunction with specific embodiments. Example 1

[0025] like Figures 1-3 As shown, an automatic water filling device for a cold water tank in a wire and cable irradiation accelerator includes a cold water tank, a water pump, an inlet pipe, a solenoid valve, a sensing component, a frequency converter, and a control system. The entire water filling device can be set to operate automatically or manually. By switching between automatic and manual operation, it can perform water replenishment at low liquid levels, water shutdown at high liquid levels, and pump stoppage and valve disconnection protection in case of failure.

[0026] In this embodiment, a control box is provided. Indicator lights and selector switches are embedded in the front panel of the control box. A frequency converter 8 is vertically installed on the left side inside the control box. Relays 13, contactors 11, and switching power supplies 10 are arranged in the middle. Terminal blocks 14 are arranged at the bottom. The incoming and outgoing lines are led out from the bottom of the cabinet and are neatly wired according to the terminal numbers.

[0027] There are multiple cold water tanks; in this embodiment, two cold water tanks are provided. The cold water tanks are steel rectangular or cylindrical storage tanks, and are equipped with inlet and outlet flanges, inspection ports, and sensor connection flanges.

[0028] The water pump is a centrifugal pump, with the motor end coupled to the frequency converter. A flange connects to the inlet pipe. A check valve is installed at the pump outlet to prevent backflow.

[0029] The inlet water pipe is made of stainless steel and connected by flanges. A filter and a check valve are installed near the cold water tank or the pump. The solenoid valve is a two-position normally closed valve driven by a coil. It remains closed under normal conditions and opens when energized.

[0030] In this embodiment, the sensing components include a liquid level sensor and a pressure sensor. There are two liquid level sensors: a high-level detector and a low-level detector. The high-level detector is located near the top of the cold water tank, and the low-level detector is located near the bottom. The high-level detector can detect the highest liquid level in the cold water tank, and the low-level detector can detect the lowest liquid level. The high-level detector uses a float structure; the low-level detectors all use a probe structure. The pressure sensor is installed on the inlet pipe and outputs the detected signal. The frequency converter 8 is located in the control box and includes a parameter keypad.

[0031] In this embodiment, the control system uses relay control, as shown in the reference. Figure 3 Relay 13 is installed inside the control box.

[0032] The control box also contains an air switch 9, which is a three-phase circuit breaker used for main power isolation and overload / short circuit protection. A switching power supply 10 is also located in the control box; this power supply, which outputs 24V DC to the relays, is box-shaped.

[0033] Contactor 11 is used to connect the main circuit of the main motor. It has main contacts and auxiliary contacts. A fuse 12 is provided on the side of contactor 11, which provides protection for the control circuit. Terminal block 14 is provided at the bottom of the control box for centralized wiring.

[0034] Reference Figure 2 A display area is set at the cabinet door for controlling the electrical wires. The display area is equipped with the following indicators: 1. Solenoid valve operation indicator 1; 2. Solenoid valve operation indicator 2; 3. Main switch; 4. Solenoid valve starting device; 5. Power indicator; 6. Automatic / stop / manual three-position selector switch; 7.

[0035] In this embodiment, the three-phase power supply enters the main circuit of the frequency converter 8 and contactor 11 through the air switch 9. The main contacts of contactor 11 control the motor power supply. The switching power supply 10 converts AC to 24VDC and distributes it to relay 13, liquid level sensor, pressure sensor, etc. The 24VDC is output through terminal block 14, and fuse 12 protects each branch.

[0036] The signals detected by the high-level and low-level detectors can be transmitted to relay 13 via signal lines. When the liquid level drops to the position of the low-level detector, the low-level detector outputs a low-level signal to the control system. The control system then activates the solenoid valve and water pump via the relay, opening the water supply circuit to achieve automatic water replenishment. When the liquid level rises to the position of the high-level detector, the high-level detector outputs a high-level signal. The control system then disconnects the start / stop circuit between the solenoid valve and the water pump via the relay, stopping water supply.

[0037] In this embodiment, the high liquid level detector and the low liquid level detector are respectively connected to two signal input terminals of the control system; the control system is equipped with two relays K1 and K2. The low liquid level detector can control the normally open contact of relay K1 to close, thereby controlling the solenoid valve and water pump to start; the action of the high liquid level detector can cause the normally closed contact of relay K2 to open, cutting off the K1 circuit and stopping the solenoid valve and water pump.

[0038] The normally closed contacts of relays K1 and K2 are connected in series, meaning that the operation of either relay will disconnect the control circuit of the other, thus preventing two signals from being effective simultaneously. When the liquid level changes between high and low levels, only one signal is active. In this embodiment, low liquid level priority starts the circuit, and high liquid level priority stops it. When the liquid level detector signal switches, the solenoid valve and water pump will not repeatedly start and stop, ensuring a smooth water replenishment process and preventing overload of mechanical components and circuit interference.

[0039] Reference Figure 1 The system consists of two water tanks: Cold Water Tank 1 and Cold Water Tank 2. The left side of the diagram shows the power supply and various control circuits, while the right side shows a summary of all liquid level signals. Based on the diagram, the system can achieve: automatic / manual switching, operation indication, independent water replenishment control for Cold Water Tank 1 and Cold Water Tank 2, valve-pump sequential linkage, and pump stop interlock protection implemented through inverter fault output.

[0040] The left vertical line represents the positive terminal of the control power supply, labeled L in the diagram; the multiple vertical lines on the right represent the neutral signal bus, labeled N1-N5 in the diagram.

[0041] In this embodiment, the incoming line enters the main control circuit after passing through fuse FR1. The panel has a "Stop / Start" selection, an "Automatic / Stop / Manual" three-position switch, and a "Manual Start" button; the "Manual Start" button is used during maintenance.

[0042] The automatic water replenishment logic will only respond to the low level signal when "Automatic" is selected and there is no fault; in "Manual" mode, the panel buttons can directly drive the solenoid valve or pump.

[0043] It also includes a running indicator circuit. When the system enters the running state, the corresponding indicator light illuminates, and the display is fed back through relay contacts.

[0044] A low-level input is connected to a relay circuit. When the low-level position is closed, the intermediate relay is energized. The normally open contact of the low-level relay is used for self-locking, forming a self-holding circuit.

[0045] After the low liquid level relay is activated, its normally open contact drives the solenoid valve relay, energizing the valve coil and opening the solenoid valve (see the "water replenishment solenoid valve" coil symbol in the diagram). Simultaneously, it activates the valve operation indicator light.

[0046] After the valve opens and the delay period is complete, the control output is sent to the inverter's start input to start the water pump. Water pump startup is typically achieved through the inverter's DI input and a contactor closing the main power supply.

[0047] High liquid level input is the stop condition: GR1 will trigger its normally closed contact to enter the low-level start circuit, release CR1 self-locking, close the valve and issue a pump stop command.

[0048] The inverter fault output is connected to the fault intermediate relay. The normally closed contact of the intermediate relay is connected in series in the main circuit of the low-level starting circuit of each box. When the VFD reports a fault, the fault relay operates to open the series contact, and all starting circuits are cut off, realizing "fault priority to stop pump and close valve".

[0049] The low-level relay is self-locking: when the low-level relay is closed, it drives CR1, and CR1-1 is connected in parallel with the low-level contact to form a self-holding mechanism; when the high-level relay is energized, its normally closed contact GR1-1 is connected in series with the CR1 coil circuit, causing CR1 to lose power.

[0050] The normally closed contact of the fault relay is connected in series on the CR1 coil power supply line, so it will disconnect first in case of a fault.

[0051] The solenoid valve is driven by a KV relay that isolates the drive coil, and the relay contacts simultaneously drive the valve indicator light. The pump is driven by a VFD start / stop signal linked to a contactor, and is not directly powered by the valve relay to maintain a safe sequence.

[0052] During runtime: When the system is in the "automatic" position and there are no faults.

[0053] 1. When the liquid level in cold water tank 1 is low, DR1 closes, energizing and locking CR1. As a result, Kv1 engages, the solenoid valve opens and the indicator light illuminates. After a 2-second delay, the frequency converter receives the start command and controls the contactor to close, thus starting the water pump. During this process, the frequency converter adjusts the frequency according to the pressure feedback to maintain the target pressure.

[0054] 2. When the liquid level rises to the high liquid level set value, GR1 is energized, disconnecting the coil circuit of CR1 to control CR1 to release. Kv1 is de-energized, at which point the solenoid valve closes, the indicator light turns off, the frequency converter receives the stop command and decelerates to stop until the contactor disconnects.

[0055] 3. When a frequency converter fault is triggered at any time, Kf will activate, disconnecting the power supply to all low-level relays, controlling all solenoid valves to close, stopping the water pump, and illuminating the alarm light.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention, all of which fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic water filling device for the cold water tank of a wire and cable irradiation accelerator. Includes cold water tank, water pump, inlet pipe, solenoid valve, sensor components, and control system. Its features are: The sensing components include a liquid level sensor and a pressure sensor. The pressure sensor is installed on the water inlet pipe and can detect the water supply pressure and output an analog signal. The signal detected by the liquid level sensor can be transmitted to the control system, which can control the solenoid valve to automatically open for water supply when the liquid level is low and automatically stop for water supply when the liquid level is high. The control system is able to receive signals from the pressure sensor.

2. An automatic water filling device for a cold water tank of a wire and cable irradiation accelerator according to claim 1, characterized in that: The control system includes a frequency converter, indicator lights, a switching power supply, and a control device. The indicator lights can display the status of the frequency converter, and the control device can control the frequency converter.

3. The automatic water filling device for the cold water tank of the wire and cable irradiation accelerator according to claim 2, characterized in that: The switching power supply can power the level sensor and the pressure sensor.

4. The automatic water filling device for the cold water tank of the wire and cable irradiation accelerator according to claim 3, characterized in that: The liquid level sensor includes a high liquid level detector and a low liquid level detector, which correspond to the upper limit water level and lower limit water level of the cold water tank, respectively; the high liquid level detector and the low liquid level detector are interlocked through a relay.

5. The automatic water filling device for the cold water tank of the wire and cable irradiation accelerator according to claim 4, characterized in that: The solenoid valve is driven by the relay in an isolated manner, and the solenoid valve opens or closes synchronously with the start / stop signal of the water pump.

6. The automatic water filling device for the cold water tank of the wire and cable irradiation accelerator according to claim 3, characterized in that: The pressure sensor outputs a signal to the frequency converter, and the frequency converter controls the solenoid valve according to the output signal.

7. The automatic water filling device for the cold water tank of the wire and cable irradiation accelerator according to claim 1, characterized in that: The control system is equipped with a running indicator light, a power indicator light, and a solenoid valve running indicator light, which can display the operating status.

8. The automatic water filling device for the cold water tank of the wire and cable irradiation accelerator according to claim 1, characterized in that: The water pump and the solenoid valve are controlled by a switch.

9. An automatic water filling device for a cold water tank of a wire and cable irradiation accelerator according to claim 1, characterized in that: The cold water tank can be connected to a remote pure water delivery system, enabling automatic replenishment of pure water through long-distance water supply pipelines.

10. The automatic water filling device for the cold water tank of the wire and cable irradiation accelerator according to claim 1, characterized in that: At least one cold water tank is provided; each cold water tank is equipped with a sensing component.

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