Micro-pressure control system for pulling capillary tube

Abstract

A micropressure control system for pulling a capillary tube comprises a nitrogen input end which is sequentially connected with a first automatic control valve, a mechanical pressure gauge, a first one-way valve, a flow control feedback valve, a second automatic control valve, a gas storage tank, a fifth automatic control valve, a second one-way valve, an electronic pressure gauge and a nitrogen outlet through pipelines. A four-way valve is arranged between the gas storage tank and the second automatic control valve, the other two ports of the four-way valve are respectively connected with a third automatic control valve and a fourth automatic control valve through pipelines, the third automatic control valve is communicated with the redundant nitrogen release port, the fourth automatic control valve is connected with a vacuum pump, and the vacuum pump is provided with a nitrogen vacuumizing discharge port. According to the utility model, the requirement of stable pressure in the quartz tube is met, and meanwhile, the technical scheme also provides accurate control of pressure precision.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of drawing capillary tube device in optical fiber industry, especially relates to the micro pressure control system for drawing capillary tube. BACKGROUND

[0002] Because the optical fiber industry is extremely high to the roundness of the inside and outside diameter of drawing capillary tube, when drawing capillary tube, nitrogen is filled in the raw material quartz tube, according to the process requirement, the quartz tube should be kept in the pressure range of -200 mbar-200 mbar in real time, and after setting the pressure, the pressure accuracy requirement is kept in 0.1 mbar. If the pressure value changes, it will seriously affect the roundness of the inside and outside diameter of capillary tube. Therefore, the problem to be solved by the utility model is: how to ensure that the pressure and flow of nitrogen can be controlled with high precision in the process of drawing capillary tube, so as to improve the consistency and stability of product quality. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide the micro pressure control system for drawing capillary tube, which realizes the stable pressure requirement in the quartz tube and provides accurate control of pressure accuracy.

[0004] To solve the above technical problem, the technical scheme adopted by the utility model is:

[0005] The micro pressure control system for drawing capillary tube comprises a nitrogen input end, the nitrogen input end is connected with a first automatic control valve, a mechanical pressure gauge, a first one-way valve, a flow control feedback valve, a second automatic control valve, a gas storage tank, a fifth automatic control valve, a second one-way valve, an electronic pressure gauge and a nitrogen outlet in sequence through pipelines.

[0006] A four-way valve is arranged between the gas storage tank and the second automatic control valve, another two ports of the four-way valve are connected with a third automatic control valve and a fourth automatic control valve through pipelines, the third automatic control valve is communicated with a nitrogen excess release port, the fourth automatic control valve is connected with a vacuum pump, and the vacuum pump is provided with a nitrogen vacuum pumping discharge port.

[0007] The nitrogen input end is used for providing stable nitrogen supply.

[0008] Preferably, the flow control feedback valve is controlled through a nitrogen flow control feedback device.

[0009] Preferably, the nitrogen flow control feedback device is electrically connected with a PLC, and the PLC is electrically connected with the first automatic control valve, the second automatic control valve, the third automatic control valve, the fourth automatic control valve, the fifth automatic control valve, the vacuum pump and the electronic pressure gauge.

[0010] Preferably, the stroke of the electronic pressure gauge is: -200mbar-200mbar.

[0011] Preferably, a manual valve is arranged between the first automatic control valve and the mechanical pressure gauge.

[0012] The utility model can achieve the following beneficial effects:

[0013] 1. The utility model ensures that the pressure and flow of nitrogen can be controlled with high precision during the process of drawing capillary tubes, thereby improving the consistency and stability of product quality.

[0014] 2. By designing the one-way valve (the first one-way valve and the second one-way valve) and other automatic control valves (such as the first automatic control valve, the second automatic control valve, the third automatic control valve, the fourth automatic control valve and the fifth automatic control valve), gas backflow and accidental leakage are prevented, and operation safety is ensured.

[0015] 3. The PLC (programmable logic controller) is used to realize the automatic management of the whole system, and the electronic pressure gauge and the flow control feedback valve and other components are combined to form a closed-loop control system, thereby improving operation efficiency and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings and examples:

[0017] Fig. 1 It is a system structure diagram of the utility model;

[0018] Fig. 2 It is a PLC external wiring diagram of the utility model;

[0019] Fig. 3 It is a nitrogen flow control feedback device external wiring diagram of the utility model.

[0020] In the drawings: the first automatic control valve 1, the manual valve 2, the mechanical pressure gauge 3, the first one-way valve 4, the flow control feedback valve 5, the second automatic control valve 6, the third automatic control valve 7, the fourth automatic control valve 8, the vacuum pump 9, the gas storage tank 10, the fifth automatic control valve 11, the second one-way valve 12, the electronic pressure gauge 13 and the four-way valve 14. DETAILED DESCRIPTION

[0021] The preferred scheme is as follows: Figs. 1 to 3The micro-pressure control system for drawing capillary tubes is shown, which is used to precisely control the pressure and flow of nitrogen gas to ensure stability and consistency during the drawing capillary tube process. The system includes but is not limited to: a nitrogen gas input, a first automatic control valve 1, a mechanical pressure gauge 3, a first one-way valve 4, a flow control feedback valve 5, a second automatic control valve 6, a gas storage tank 10, a fifth automatic control valve 11, a second one-way valve 12, an electronic pressure gauge 13, a four-way valve 14, a third automatic control valve 7, a fourth automatic control valve 8, and a vacuum pump 9.

[0022] Specifically, the nitrogen gas input serves as the starting point of the system, providing a stable supply of nitrogen gas whose pressure and purity are crucial for the quality of the final product. The nitrogen gas enters the system through the first automatic control valve 1 and is connected in sequence through pipes to the mechanical pressure gauge 3 for monitoring the initial pressure, followed by the first one-way valve 4 to prevent backflow of gas, ensuring the safety of the system. Then, the nitrogen gas passes through the flow control feedback valve 5, which is a key component connected to the nitrogen gas flow control feedback device, which is automatically controlled by the PLC programmable logic controller. The PLC is responsible for coordinating the operation of the entire system and is electrically connected to the first, second, third, and fourth automatic control valves 1, 6, 7, 8, the vacuum pump 9, and the electronic pressure gauge 13. This integrated control allows the system to adjust operating parameters based on real-time data, ensuring optimal performance.

[0023] The gas storage tank 10 is located after the second automatic control valve 6 and is used to store a certain amount of nitrogen gas to quickly respond to changes in demand or to maintain system operation in the event of problems with the input source. The four-way valve 14 is provided between the gas storage tank 10 and the second automatic control valve 6, which can direct the gas to the third automatic control valve 7, which in turn is connected to the nitrogen gas excess release port to communicate with the atmosphere, or to the fourth automatic control valve 8 connected to the vacuum pump 9 for evacuating the system or adjusting the internal pressure. The vacuum pump 9 is provided with a nitrogen gas evacuation discharge port to allow the gas inside the system to be discharged when needed.

[0024] The electronic pressure gauge 13 is installed near the nitrogen gas outlet, with a measurement range of -200 mbar to 200 mbar, which can provide very accurate pressure readings, which is particularly important for micro-pressure control. This instrument not only helps monitor the output pressure, but also serves as part of the feedback mechanism, sending information to the PLC for necessary adjustments. In addition, before the electronic pressure gauge 13, the second one-way valve 12 and the fifth automatic control valve 11 are provided to further ensure the safety and controllability of the system.

[0025] The first one-way valve 4 and the second one-way valve 12 can prevent gas backflow, and the first automatic control valve 1, the second automatic control valve 6, the third automatic control valve 7, the fourth automatic control valve 8 and the fifth automatic control valve 11 can be rapidly cut off or opened according to preset conditions. Overall, the micro-pressure control system combines high-precision sensing technology and intelligent control strategy, and realizes efficient management of nitrogen use in the pull capillary process.

[0026] Embodiment 1:

[0027] The device comprises a 24V DC power supply, a 15V DC power supply, a nitrogen flow control feedback device (FMC), an electronic pressure gauge (-200mbar-200mbar), a manual pressure regulating valve, a mechanical pressure gauge, a plurality of pressure one-way valves, a plurality of electromagnetic valves, a vacuum pump and a release valve, a PLC, and an analog input and output device. The electromagnetic valves comprise a first automatic control valve 1, a second automatic control valve 6, a third automatic control valve 7, and a fourth automatic control valve 8.

[0028] The CPU of the PLC controls the nitrogen flow (real-time flow can be monitored) through the flow control feedback device (FMC), reads flow data, cooperates with the pressure feedback device (-200mbar-200mbar), the vacuum pump and the release valve, and realizes stable micro-pressure control required by the project.

[0029] The required stable nitrogen input is set, the Y1 electromagnetic valve is manually opened before automatic starting, the Y-manual manual pressure regulating valve is adjusted, the pressure can be checked on the V1 mechanical pressure gauge, and the pressure is adjusted to 1.5bar. The required pressure is input on the display screen, and after clicking start, the PLC automatically realizes PID control. The PLC controls the opening of the Y1 valve, the Y2 valve, the Y4 valve and the Y5 valve, controls the nitrogen flow and real-time feedback of the FMC, and reads the feedback of the electronic pressure gauge;

[0030] The above embodiment is only a preferred technical solution of the present application, and should not be regarded as a limitation of the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, including equivalent replacement solutions of the technical features claimed in the claims. That is, equivalent replacement improvements within this range are also within the protection scope of the present application.

Claims

1. A micro-pressure control system for drawing capillaries, characterized by: The nitrogen input end is connected with the first automatic control valve (1), the mechanical pressure gauge (3), the first one-way valve (4), the flow control feedback valve (5), the second automatic control valve (6), the gas storage tank (10), the fifth automatic control valve (11), the second one-way valve (12), the electronic pressure gauge (13) and the nitrogen outlet in sequence through pipelines. The four-way valve (14) is arranged between the gas storage tank (10) and the second automatic control valve (6), and the other two ports of the four-way valve (14) are connected with the third automatic control valve (7) and the fourth automatic control valve (8) through pipelines, the third automatic control valve (7) is communicated with the nitrogen excess release port, and the fourth automatic control valve (8) is connected with the vacuum pump (9), and the vacuum pump (9) is provided with a nitrogen vacuum pumping discharge port.

2. The micro-pressure control system for drawing a capillary tube according to claim 1, characterized by: The nitrogen input end is used for providing stable nitrogen supply.

3. The micro-pressure control system for drawing a capillary tube according to claim 1, characterized by: The flow control feedback valve (5) is controlled by the nitrogen flow control feedback device.

4. The micro-pressure control system for drawing a capillary tube according to claim 1, characterized by: The nitrogen flow control feedback device is electrically connected with the PLC, and the PLC is electrically connected with the first automatic control valve (1), the second automatic control valve (6), the third automatic control valve (7), the fourth automatic control valve (8), the fifth automatic control valve (11), the vacuum pump (9) and the electronic pressure gauge (13).

5. The micro-pressure control system for drawing a capillary tube according to claim 1, characterized by: The stroke of the electronic pressure gauge (13) is -200mbar-200mbar.

6. The micro-pressure control system for drawing a capillary tube according to claim 1, wherein: The hand valve (2) is arranged between the first automatic control valve (1) and the mechanical pressure gauge (3).

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