Core rod sintering helium collecting device
By adopting a two-layer helium recovery design and intelligent adjustment system in the mandrel sintering device, the existing helium collection is incomplete and the recovery flow cannot be automatically adjusted, and efficient helium collection and automatic adjustment is achieved, ensuring product quality.
Patent Information
- Application Number
- CN202421380577.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-06-18
AI Technical Summary
The existing mandrel sintered helium collection device is incompletely collected, the loss is large, and the recovery flow cannot be automatically adjusted, so the helium loss cannot be monitored in real time.
A two-layer helium recovery design is adopted, including a first helium recovery layer and a second helium recovery layer, and a first quartz ring is provided on the top of the exhaust layer, adding a second quartz ring to improve sealing. At the same time, a helium detector and flowmeter are set up to connect it to the PLC controller to realize automatic adjustment of helium recovery flow.
It improves the helium collection rate, reduces helium loss, realizes intelligent adjustment of helium recovery flow, saves manual measurement and manual adjustment, and ensures product quality.
Smart Images
Figure CN222846628U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of core rod processing, in particular to a core rod sintering helium collecting device. Background Art
[0002] Core rod sintering is an important process in the production of optical fiber preforms. Helium is an indispensable gas in the sintering process. Helium can be used as a protective gas to prevent the optical fiber preform from being contaminated or oxidized during high-temperature sintering. Compared with other gases, helium has excellent thermal conductivity and can transfer heat to the rod faster at high temperatures in the sintering furnace. In addition, the molecular diameter of helium is very small and can pass through glass. Helium can be used to drive out air, chlorine, hydrogen chloride and other gases in the powder rod, making it dense and vitrified at high temperatures, thereby producing a fully transparent optical fiber preform.
[0003] As a rare and non-renewable resource, helium is relatively expensive and has a very low concentration in the atmosphere, making it difficult to extract. In the early production process, this precious helium was often discharged as waste gas after use, resulting in a huge waste of resources. Therefore, it is very important to effectively recycle the used helium.
[0004] Existing helium collection usually has only one helium recovery hole, and the helium collection is incomplete, resulting in some helium loss. Moreover, the helium recovery flow rate can only be adjusted manually, not automatically. During helium collection, it is also impossible to monitor in real time whether there is helium loss, and it can only be measured manually at regular intervals. If helium loss occurs, no timely alarm can be issued. Utility Model Content
[0005] To this end, the technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a core rod sintering helium collection device, which adopts two-layer helium recovery to make the helium recovery more complete and not easy to lose, thereby improving the core rod sintering helium collection rate and ensuring that the product quality is not affected; and a second quartz ring is added to the helium recovery layer to achieve a better sealing effect.
[0006] In order to solve the above technical problems, the utility model provides a core rod sintering helium collection device, comprising:
[0007] The end cover of the furnace core tube, the interior of which is divided into an exhaust layer, a first helium recovery layer, and a second helium recovery layer from top to bottom by a first quartz ring; and a first quartz ring is arranged on the top of the exhaust layer; the exhaust hole is connected to an exhaust duct, and a helium detector is arranged on the exhaust duct for real-time detection of the helium content; the first helium recovery layer is provided with a first helium recovery hole; the second helium recovery layer is provided with a second helium recovery hole;
[0008] A quartz guide rod inserted into the center of the first quartz ring for hanging the core rod;
[0009] The second quartz ring is arranged outside the quartz guide rod and located above the first quartz ring to enhance the sealing performance between the first quartz ring and the quartz guide rod.
[0010] In one embodiment of the utility model, a pressure gauge connection hole is provided at the bottom layer of the furnace core tube end cover, and an electronic pressure gauge is installed on the pressure gauge connection hole.
[0011] In one embodiment of the present invention, the ventilation holes include four holes, which are symmetrically distributed on the ventilation layer.
[0012] In one embodiment of the present invention, the ventilation layer, the first helium recovery layer, and the second helium recovery layer are all cylindrical.
[0013] In one embodiment of the present invention, the diameters of the ventilation layer, the first helium recovery layer, and the second helium recovery layer decrease in sequence.
[0014] In one embodiment of the utility model, the first helium recovery hole and the second helium recovery hole are respectively connected to the vacuum pipeline of the vacuum generator through branch recovery pipelines, and helium is collected from the first helium recovery hole and the second helium recovery hole by negative pressure.
[0015] In one embodiment of the utility model, a PLC controller is also included.
[0016] In one embodiment of the utility model, the helium detector and the flow meter are both connected to a PLC controller, and the PLC controller is used to automatically adjust the flow of the first helium recovery hole and the second helium recovery hole through the flow meter according to the signal fed back by the helium detector.
[0017] In an embodiment of the present invention, the contact surfaces of the furnace core tube end cover, the first quartz ring, and the second quartz ring are all frosted.
[0018] In one embodiment of the present invention, the diameter of the first quartz ring is greater than the diameter of the second quartz ring.
[0019] The above technical solution of the utility model has the following advantages compared with the prior art:
[0020] (1) The first helium recovery layer and the second helium recovery layer are used to realize two-layer helium recovery, so that the helium recovery is more complete and the loss is less, and the core rod sintering helium collection rate is improved, while ensuring that the product quality is not affected; and a second quartz ring is added above the first quartz ring on the first helium recovery layer and the second helium recovery layer, so that the sealing effect is better and helium is not easily lost.
[0021] (2) A helium detector is installed on the exhaust duct of the exhaust hole to detect the helium content in real time. The helium recovery flow rate can be automatically adjusted through the flow meter according to the signal fed back by the helium detector, thus realizing intelligent adjustment and saving manual measurement and manual adjustment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein
[0023] Figure 1 It is a structural schematic diagram of a core rod sintering helium collection device in a preferred embodiment of the utility model;
[0024] Explanation of the reference numerals in the specification: 1. furnace core tube end cover; 2. first quartz ring; 3. quartz guide rod; 4. second quartz ring; 11. exhaust layer; 12. first helium recovery layer; 13. second helium recovery layer; 14. pressure gauge connection hole; 111. exhaust hole; 121. first helium recovery hole; 131. second helium recovery hole. DETAILED DESCRIPTION
[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0026] Reference Figure 1 As shown, the core rod sintering helium collection device of the utility model comprises:
[0027] The furnace core tube end cover 1, the interior of which is divided into an exhaust layer 11, a first helium recovery layer 12, and a second helium recovery layer 13 from top to bottom by a first quartz ring 2; and the first quartz ring 2 is arranged on the top of the exhaust layer 11, and an exhaust hole 111 is arranged on the exhaust layer 11, and an exhaust pipe is connected to the exhaust hole 111, and a helium detector is arranged on the exhaust pipe for real-time detection of the helium content; the first helium recovery layer 12 is provided with a first helium recovery hole 121; the second helium recovery layer 13 is provided with a second helium recovery hole 131; the first helium recovery hole 121 and the second helium recovery hole 131 are both connected to a flow meter;
[0028] A quartz guide rod 3, inserted into the center of the first quartz ring 2 and used for hanging the core rod;
[0029] The second quartz ring 4 is arranged outside the quartz guide rod 3 and located above the first quartz ring 2 to enhance the sealing performance between the first quartz ring 2 and the quartz guide rod 3 .
[0030] In the core rod sintering helium collection device based on the above structure, the exhaust layer 11, the first helium recovery layer 12, and the second helium recovery layer 13 in the furnace core tube end cover 1 are separated by a first quartz ring. On the one hand, it avoids the helium recovery directly extracting the helium in the furnace core tube, which affects the product quality. On the other hand, it reduces the extraction of helium by the exhaust layer 11 and improves the helium collection rate.
[0031] Furthermore, the bottom layer of the furnace core tube end cover 1 is provided with a pressure gauge connection hole 14, and an electronic pressure gauge is installed on the pressure gauge connection hole 14. Helium enters from the bottom of the furnace core tube end cover 1, is discharged from the top, passes through two layers of helium recovery layers, and is collected by negative pressure. The bottom layer of the furnace core tube end cover 1 is connected to an electronic pressure gauge, and a slight positive pressure is maintained in the furnace core tube end cover 1. If the pressure is low for a long time, it means that the sealing is poor, and an alarm will be issued to remind the operator to clean the furnace core tube end cover 1, the first quartz ring 2 and the second quartz ring 4, and check the sealing.
[0032] Preferably, the ventilation holes 111 include four, which are symmetrically distributed on the ventilation layer 11. The ventilation holes 111 are used for ventilation in order to extract the gas exhausted in the process through negative pressure to prevent the leakage of toxic gas chlorine.
[0033] In this embodiment, the ventilation layer 11, the first helium recovery layer 12, and the second helium recovery layer 13 are all cylindrical.
[0034] In this embodiment, the diameters of the ventilation layer 11, the first helium recovery layer 12, and the second helium recovery layer 13 decrease in sequence.
[0035] Furthermore, the first helium recovery hole 121 and the second helium recovery hole 131 are respectively connected to the vacuum pipeline of the vacuum generator through branch recovery pipelines, and helium is collected from the first helium recovery hole 121 and the second helium recovery hole 131 by negative pressure.
[0036] In addition, a PLC controller is also included, and the helium detector and the flow meter are both connected to the PLC controller. The PLC controller is used to automatically adjust the flow of the first helium recovery hole and the second helium recovery hole through the flow meter according to the signal fed back by the helium detector. The setting of the PLC controller enables the helium recovery flow to be automatically adjusted, and is linked with the helium detector to achieve intelligent adjustment, saving manual measurement and manual adjustment.
[0037] In this embodiment, the contact surfaces of the furnace core tube end cover 1, the first quartz ring 2, and the second quartz ring 4 are all frosted. The diameter of the first quartz ring 2 is larger than the diameter of the second quartz ring 4. The frosting treatment and the design of the second quartz ring 4 are both for improving the sealing performance.
[0038] When in use, first set the initial flow rate and upper and lower limits of each stage according to the sintering recipe. During the sintering process, when the helium detector detects helium or the detection value is higher than the set value, first increase the flow rate of the first helium recovery hole 121 little by little until the flow rate is stopped when no helium is detected; if the flow rate of the first helium recovery hole 121 reaches the upper limit and helium can still be detected, increase the flow rate of the second helium recovery hole 131; if both helium recovery flow rates reach the upper limit and helium can still be detected, an alarm is issued to remind the operator to clean the furnace core tube end cover, the first quartz ring 2 and the second quartz ring 4, and check the sealing.
[0039] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.
Claims
1. A core rod sintering helium collection device, characterized in that: include: The end cover of the furnace core tube, the interior of which is divided into an exhaust layer, a first helium recovery layer and a second helium recovery layer from top to bottom by a first quartz ring, and the first quartz ring is arranged on the top of the exhaust layer; the exhaust layer is provided with an exhaust hole, the exhaust hole is connected to an exhaust pipe, and a helium detector is arranged on the exhaust pipe for real-time detection of the helium content; the first helium recovery layer is provided with a first helium recovery hole; the second helium recovery layer is provided with a second helium recovery hole; the first helium recovery hole and the second helium recovery hole are both connected to a flow meter; A quartz guide rod inserted into the center of the first quartz ring for hanging the core rod; The second quartz ring is arranged outside the quartz guide rod and located above the first quartz ring to enhance the sealing performance between the first quartz ring and the quartz guide rod.
2. A core rod sintering helium collection device according to claim 1, characterized in that: The bottom layer of the furnace core tube end cover is provided with a pressure gauge connection hole, and an electronic pressure gauge is installed on the pressure gauge connection hole.
3. The core rod sintering helium collection device according to claim 1, characterized in that: The ventilation holes include four holes which are symmetrically distributed on the ventilation layer.
4. The core rod sintering helium collection device according to claim 1, characterized in that: The ventilation layer, the first helium recovery layer and the second helium recovery layer are all cylindrical.
5. The core rod sintering helium collection device according to claim 4, characterized in that: The diameters of the ventilation layer, the first helium recovery layer, and the second helium recovery layer decrease in sequence.
6. The core rod sintering helium collection device according to claim 1, characterized in that: The first helium recovery hole and the second helium recovery hole are respectively connected to the vacuum pipeline of the vacuum generator through branch recovery pipelines, and helium is collected from the first helium recovery hole and the second helium recovery hole by negative pressure.
7. A core rod sintering helium collection device according to claim 6, characterized in that: Also includes a PLC controller.
8. The core rod sintering helium collection device according to claim 7, characterized in that: The helium detector and the flow meter are both connected to a PLC controller, and the PLC controller is used to automatically adjust the flow of the first helium recovery hole and the second helium recovery hole through the flow meter according to the signal fed back by the helium detector.
9. The core rod sintering helium collection device according to claim 1, characterized in that: The furnace core tube end cover, the first quartz ring and the contact surfaces of the second quartz ring are all frosted.
10. The core rod sintering helium collection device according to claim 1, characterized in that: The diameter of the first quartz ring is greater than the diameter of the second quartz ring.