CN-224232125-U - Pressure control device for optical fiber preform deposition and optical fiber preform deposition system

CN224232125UCN 224232125 UCN224232125 UCN 224232125UCN-224232125-U

Abstract

The utility model belongs to the technical field of optical fiber manufacturing, and discloses a pressure control device for optical fiber preform deposition and an optical fiber preform deposition system. The pressure control device comprises a controller, a pressure sensor, a pumping valve and two flow control valves, wherein the pressure sensor, the pumping valve and the two flow control valves are respectively connected with the controller, the two flow control valves are provided with different ranges and are arranged on a first pipeline for introducing protective gas, the first pipeline is communicated with a cavity, the cavity is communicated with an outlet end of a liner tube, an inlet end of the liner tube is communicated with a second pipeline for introducing process gas, and the pressure sensor and the pumping valve are respectively arranged on the cavity. On the basis of the device, the utility model also provides an optical fiber preform deposition system. The utility model can not only meet the precision requirement of pressure regulation, but also reach the upper limit of pressure control, and can continuously and accurately control the pressure in the pipe.

Inventors

YAO WEI
XIA CHENGUANG
ZHOU NAN
QI WEI
XIONG JUNSONG
LI ZHE

Assignees

长飞光纤光缆股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250722

Claims (10)

1. The pressure control device for depositing the optical fiber preform is characterized by comprising a controller, a pressure sensor, a pumping valve and two flow control valves, wherein the pressure sensor, the pumping valve and the two flow control valves are respectively connected with the controller; The two flow control valves with different ranges are arranged on a first pipeline for introducing protective gas, the first pipeline is communicated with a cavity, the cavity is communicated with the outlet end of a liner tube, the inlet end of the liner tube is communicated with a second pipeline for introducing process gas, and the pressure sensor and the pumping valve are respectively arranged on the cavity.
2. The pressure control device for optical fiber preform deposition according to claim 1, wherein the two flow control valves configured with different ranges include a first flow control valve having a first range of 0 to Q1, the value of Q1 being in the range of 20L/min to 30L/min, and a second flow control valve having a second range of 0 to Q2, the value of Q2 being in the range of 4L/min to 6L/min.
3. The pressure control device for optical fiber preform deposition according to claim 2, wherein the first pipe comprises a base pipe and a regulating pipe connected in parallel, the first flow control valve being installed on the base pipe, and the second flow control valve being installed on the regulating pipe.
4. A pressure control device for optical fiber preform deposition according to claim 3, wherein the first flow control valve is for controlling the base pipe to be supplied with a fixed flow rate of the base shielding gas, and the second flow control valve is for controlling the adjusting pipe to be supplied with an adjustable flow rate of the adjusting shielding gas.
5. The pressure control device for optical fiber preform deposition according to claim 1, wherein the pressure control accuracy of the pressure control device for optical fiber preform deposition is within ±2 Pa.
6. The pressure control device for optical fiber preform deposition according to claim 1, wherein the opening degree adjustment range of the pumping valve is 0 to 100%.
7. The pressure control device for optical fiber preform deposition according to claim 6, wherein the initial opening degree of the pumping valve is set to 45% to 55%.
8. The pressure control device for depositing the optical fiber preform according to claim 1, wherein the controller is a PID controller, and the PID controller is used for controlling the opening of the pumping valve and the openings of the two flow control valves with different ranges according to the detected pressure value obtained by the pressure sensor and a preset target pressure value.
9. The pressure control device for optical fiber preform deposition according to claim 1, wherein the shielding gas employs nitrogen.
10. An optical fiber preform deposition system comprising an exhaust gas treatment device, a protection gas source, a process gas source, and a pressure control device for optical fiber preform deposition according to any one of claims 1-9; The tail gas treatment device is connected with a pumping valve in the pressure control device for depositing the optical fiber preform, the protection gas source is communicated with a first pipeline in the pressure control device for depositing the optical fiber preform, and the process gas source is communicated with a second pipeline in the pressure control device for depositing the optical fiber preform.

Description

Pressure control device for optical fiber preform deposition and optical fiber preform deposition system Technical Field The utility model belongs to the technical field of optical fiber manufacturing, and particularly relates to a pressure control device for optical fiber preform deposition and an optical fiber preform deposition system. Background In the deposition process of the preform, the process gas flow rate is continuously changed due to different process temperatures, the inner diameter of a liner tube (for example, a glass liner tube) is gradually reduced along with the process, dust exists in the tube in the deposition process, and the factors can cause pressure change in the tube, so that the defects of uneven deposition, swelling of the outer wall of the tube and the like are caused. Therefore, the pressure is controlled to be constant by introducing the gas with adjustable flow into the liner tube in the deposition process so as to ensure the overall uniformity of the preform. However, existing pressure control devices for optical fiber preform deposition (i.e., devices for pressure control within the liner) typically employ only one range of flow control valves to perform the control operation. If a large-range flow control valve is adopted, the problem that the pressure accuracy in the regulating pipe cannot meet the process requirement occurs, and if a high-accuracy small-range flow control valve is adopted, the problem that the accuracy can meet the requirement but the upper limit of pressure control cannot be met occurs. In the specific application scene of optical fiber preform deposition, how to design a pressure control device so as to achieve the accuracy requirement of pressure regulation and the upper limit of pressure control is a subject to be paid attention to and solved in the field. Disclosure of utility model The utility model solves the problem that the pressure control device for depositing the optical fiber preform in the prior art cannot meet the requirements of pressure regulation precision and range simultaneously by providing the pressure control device for depositing the optical fiber preform and the optical fiber preform deposition system. The utility model provides a pressure control device for depositing an optical fiber preform, which comprises a controller, a pressure sensor, a pumping valve and two flow control valves, wherein the pressure sensor, the pumping valve and the two flow control valves are respectively connected with the controller; The two flow control valves with different ranges are arranged on a first pipeline for introducing protective gas, the first pipeline is communicated with a cavity, the cavity is communicated with the outlet end of a liner tube, the inlet end of the liner tube is communicated with a second pipeline for introducing process gas, and the pressure sensor and the pumping valve are respectively arranged on the cavity. Preferably, the two flow control valves configured with different ranges comprise a first flow control valve with a first range and a second flow control valve with a second range, wherein the first range is 0 to Q1, the value range of Q1 is 20L/min to 30L/min, the second range is 0 to Q2, and the value range of Q2 is 4L/min to 6L/min. Preferably, the first pipeline comprises a base pipeline and a regulating pipeline which are connected in parallel, the first flow control valve is arranged on the base pipeline, and the second flow control valve is arranged on the regulating pipeline. Preferably, the first flow control valve is used for controlling the base pipeline to be filled with a base protective gas with a fixed flow, and the second flow control valve is used for controlling the adjusting pipeline to be filled with an adjusting protective gas with an adjustable flow. Preferably, the pressure control accuracy of the pressure control device for depositing the optical fiber preform is within + -2 Pa. Preferably, the opening adjustment range of the pumping valve is 0 to 100%. Preferably, the initial opening degree of the pumping valve is set to be 45-55%. Preferably, the controller adopts a PID controller, and the PID controller is used for controlling the opening of the pumping valve and the opening of the two flow control valves with different ranges according to the detected pressure value obtained by the pressure sensor and a preset target pressure value. Preferably, the shielding gas is nitrogen. In another aspect, the utility model provides an optical fiber preform deposition system, comprising an exhaust gas treatment device, a protection gas source, a process gas source, and a pressure control device for optical fiber preform deposition as described above; The tail gas treatment device is connected with a pumping valve in the pressure control device for depositing the optical fiber preform, the protection gas source is communicated with a first pipeline in the pressure control device for depositing the opt