High temperature resistant gas inlet end rotary seal joint

Abstract

The utility model relates to a kind of high-temperature-resistant gas inlet end rotary seal joint, including sealing end cap, the sealing end cap one end is connected with rotating shaft seal, the rotating shaft is configured with fixed seat cover and is set dynamic seal, it is characterized in that the sealing end cap is configured with rotating shaft one end and is provided with cooling water tank, the cooling water tank is connected with the water inlet hole and water outlet hole of rotating shaft and is opened, the middle part of the sealing end cap is equipped with vent, the vent is connected with the air guide hole of rotating shaft and is opened, the fixed seat cover is respectively spaced apart and is equipped with with the water inlet hole and water outlet hole of rotating shaft and is connected with water inlet and water outlet, while also being equipped with with the air guide hole of rotating shaft and is connected with gas interface of fixed seat cover and is opened.The utility model not only enhances the working reliability of rotary seal joint, but also improves the sealing reliability, and effectively prolongs the service life of sealing ring;The utility model is compact in structure, and is reasonably arranged.

Description

Technical Field

[0001] This utility model relates to a high-temperature resistant rotary sealing joint for the air inlet end of a quartz tube stretching lathe, belonging to the technical field of quartz glass tube manufacturing equipment. Background Technology

[0002] The main technical route for preparing quartz tubes currently involves feeding thick-walled hollow quartz columnar billets into a heating furnace via a feeding device. After high-temperature softening, thin-walled quartz tubes are obtained through vertical or horizontal stretching. The furnace temperature typically reaches around 2000℃. During the process, to achieve radial expansion of the quartz tube, an inert gas is usually introduced to establish a stable target tube pressure and prevent billet collapse. Simultaneously, to ensure uniform heating of the billet in the furnace, it is usually rotated along its axis. The end (air inlet end) of the thick-walled hollow quartz columnar billet needs to achieve a reliable rotary seal while withstanding the high-temperature environment and supplying gas into the billet tube to establish tube pressure. Although existing rotary seal joints use high-temperature resistant sealing rings, they still suffer from problems such as an unreasonable joint structure and short seal service life. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a high-temperature resistant rotary sealing joint for a quartz tube stretching lathe, which not only has a reasonable structure, but also has high temperature resistance and high sealing reliability.

[0004] The technical solution proposed by this utility model to solve the above-mentioned problems is as follows: It includes a sealing end cap, one end of which is sealed to a rotating shaft. The rotating shaft is configured with a fixed seat and a dynamic seal is provided. The sealing end cap, configured with the rotating shaft, has a cooling water tank at one end. The cooling water tank is connected to a water inlet and a water outlet on the rotating shaft. A vent hole is provided in the middle of the sealing end cap, connected to a vent hole on the rotating shaft. The fixed seat has a water inlet and a water outlet spaced apart and connected to the water inlet and water outlet of the rotating shaft. Additionally, a vent hole is provided on the fixed seat and connected to the vent hole of the rotating shaft.

[0005] According to the above scheme, bearings are installed at both ends of the inner hole of the fixed seat sleeve and connected to the rotating shaft, and a fixed end cap is connected to the outer end of the fixed seat sleeve.

[0006] According to the above scheme, one end of the fixed end cap is connected to a telescopic clamping device.

[0007] According to the above scheme, the telescopic pressing device is a telescopic cylinder, and the telescopic cylinder is connected to the fixed end cover through a piston rod.

[0008] According to the above scheme, a connecting flange is installed on the inner end of the telescopic cylinder, and a guide rod is installed between the connecting flange and the fixed end cover.

[0009] According to the above scheme, the inner hole of the fixed seat or the outer circumference of the rotating shaft is provided with an annular water groove at intervals corresponding to the water inlet and water outlet, and the annular water groove is connected to the water inlet and water outlet respectively.

[0010] According to the above scheme, the inner hole of the fixed seat or the outer circumference of the rotating shaft is provided with an annular air groove corresponding to the air interface, and the annular air groove is connected to the air guide hole.

[0011] According to the above scheme, the annular air groove is located on the side of the fixed end cover near the fixed seat sleeve.

[0012] According to the above scheme, sealing rings are installed axially at intervals in the inner hole of the fixed seat sleeve corresponding to the annular water groove and the annular air groove, so that at least one sealing ring is provided on each side of each annular water groove and annular air groove.

[0013] According to the above scheme, the end of the rotating shaft that is configured with the sealing end cover is provided with a connecting plate with a larger outer diameter, and the end face of the connecting plate is provided with sealing rings on both sides of the cooling water tank of the sealing end cover.

[0014] According to the above scheme, the other end face of the sealing end cap is connected to the end face of the hollow quartz columnar blank, and a sealing ring is installed on the end face of the sealing end cap.

[0015] According to the above scheme, the sealing ring is a high-temperature resistant rubber sealing ring, including an X-type sealing ring for dynamic sealing of the shaft and an O-type sealing ring for static sealing of the end cover.

[0016] This utility model is installed at one end of a quartz tube stretching lathe. A telescopic clamping device tightly connects the sealing end cap to the end face of the hollow quartz columnar blank to be processed. The sealing end cap and the rotating shaft rotate with the hollow quartz columnar blank. With heating activated, inert gas is introduced into the inner hole of the hollow quartz columnar blank through the air inlet and air guide hole to establish internal pressure. Simultaneously, cooling water is introduced through the water inlet, flows through the cooling water tank, and exits through the water outlet, carrying away heat from the sealing end cap and the rotating shaft. This keeps the entire joint operating within a lower temperature range, allowing the high-temperature resistant rubber sealing ring to operate under lower temperature conditions, effectively extending its service life.

[0017] The beneficial effects of this utility model are as follows: 1. The water cooling method can achieve reliable sealing in high-temperature environments, which not only enhances the working reliability of the rotary sealing joint, but also improves the sealing reliability and effectively extends the service life of the sealing ring; 2. The use of cooling water tank, annular water tank, and air tank makes the structure of this utility model compact and reasonably set; 3. The use of telescopic clamping device to drive the rotary joint body to press the end face of the hollow quartz columnar blank makes it easy to achieve automated operation and improve production efficiency. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of an embodiment of this utility model.

[0019] Figure 2 A cross-sectional view of the fixed seat and rotating shaft in one embodiment of this utility model.

[0020] Figure 3 A full sectional view of an embodiment of this utility model. Detailed Implementation

[0021] The present invention will be further described and illustrated below with reference to the embodiments and accompanying drawings.

[0022] Examples of embodiments of this utility model Figure 1-3As shown, the device includes a disc-shaped sealing end cap 2. One end of the sealing end cap is sealed to the rotating shaft 3, and the other end is tightly connected to the end face of the hollow quartz columnar blank 1 to be processed. A cooling water tank is provided at the end of the sealing end cap that is configured with the rotating shaft. The cooling water tank is divided into an inlet end and an outlet end, with the two ends respectively located at the two ends of the semi-circular arc cooling water tank. The rotating shaft is configured with a fixed seat 4 and is provided with a dynamic seal. The cooling water tank is connected to the inlet and outlet holes opened on the rotating shaft. The inlet holes include axial inlet holes and radial inlet holes, and the outlet holes include axial outlet holes and radial outlet holes. A vent hole is opened in the middle of the sealing end cap, and the vent hole is connected to the air guide hole opened on the rotating shaft. Bearings 10 and 17 are installed at both ends of the inner hole of the fixed seat and connected to the rotating shaft. The bearings can be sliding bearings and are axially positioned and stopped by the positioning retaining ring 19 on the rotating shaft. A fixed end cap 5 is connected to the outer end of the fixed seat. The fixed seat sleeve is provided with a water inlet interface 16 and a water outlet interface 14, which are respectively connected to the radial water inlet and water outlet of the rotating shaft. The water inlet and water outlet interfaces are threaded interfaces. The inner hole of the fixed seat sleeve is provided with annular water grooves corresponding to the water inlet and water outlet interfaces, which are connected to the water inlet and water outlet respectively. At the same time, the fixed seat sleeve is also provided with an air inlet interface 15, which is connected to the air guide hole of the rotating shaft. The inner hole of the fixed seat sleeve is provided with annular air grooves corresponding to the air inlet interface, which are connected to the air guide hole. The annular air grooves are located on the side of the fixed end cover near the fixed seat sleeve. The inner hole of the fixed seat sleeve is provided with sealing rings axially spaced corresponding to the annular water grooves and annular air grooves. One sealing ring is provided on each side of each annular water groove and annular air groove, for a total of 4. The sealing rings are high-temperature resistant rubber X-type sealing rings, forming a dynamic seal. The rotating shaft is equipped with a connecting plate with a larger outer diameter at one end, which is matched with the sealing end cover. Sealing rings 13 are installed on both sides of the cooling water tank of the sealing end cover on the end face of the connecting plate. A sealing ring 18 is installed at the vent hole in the middle. A sealing ring 12 is installed at the connection between the other end face of the sealing end cover and the end face of the hollow quartz columnar blank. The sealing rings are high-temperature resistant rubber O-rings, forming a static seal. A telescopic pressing device 7 is connected to one end of the fixed end cover of the fixed seat sleeve. The telescopic pressing device is a telescopic cylinder, which is connected to the fixed end cover via a piston rod. A connecting flange 6 is installed on the inner end of the telescopic cylinder. A guide rod 9 and a guide sleeve 8 are installed between the connecting flange and the fixed end cover. The connecting flange is fixedly connected to the quartz tube stretching lathe. In this embodiment, the rotating shaft rotates at a speed of 5-20 rpm, rotating together with the hollow quartz columnar blank.

Claims

1. A high-temperature resistant rotary sealing joint for an air inlet, comprising a sealing end cover, one end of which is sealed to a rotating shaft, the rotating shaft being configured with a fixed seat and provided with a dynamic seal, characterized in that... The sealing end cap is provided with a cooling water tank at one end configured with the rotating shaft. The cooling water tank is connected to the water inlet and water outlet holes on the rotating shaft. A vent hole is provided in the middle of the sealing end cap, which is connected to the air guide hole on the rotating shaft. The fixed seat is provided with water inlet and water outlet interfaces that are connected to the water inlet and water outlet holes of the rotating shaft at intervals. At the same time, an air interface that is connected to the air guide hole of the rotating shaft is also provided on the fixed seat.

2. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 1, characterized in that... The inner holes of the fixed seat are equipped with bearings at both ends, which are connected to the rotating shaft. A fixed end cap is connected to the outer end of the fixed seat.

3. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 2, characterized in that... One end of the fixed end cap is connected to a telescopic clamping device.

4. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 3, characterized in that... The telescopic clamping device is a telescopic cylinder, which is connected to the fixed end cap via a piston rod.

5. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 4, characterized in that... The inner end of the telescopic cylinder is provided with a connecting flange, and a guide rod is provided between the connecting flange and the fixed end cover.

6. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 1 or 2, characterized in that... The inner hole of the fixed seat or the outer circumference of the rotating shaft is provided with an annular water groove at intervals corresponding to the water inlet and water outlet, and the annular water groove is connected to the water inlet and water outlet respectively.

7. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 6, characterized in that... The inner hole of the fixed seat or the outer circumference of the rotating shaft is provided with an annular air groove corresponding to the air interface, and the annular air groove is connected to the air guide hole.

8. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 7, characterized in that... The annular air groove is located on the side of the fixed end cover near the fixed seat sleeve.

9. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 7, characterized in that... The inner hole of the fixed seat sleeve is provided with sealing rings at axial intervals corresponding to the annular water groove and the annular air groove, so that at least one sealing ring is provided on each side of each annular water groove and annular air groove.

10. The high-temperature resistant rotary sealing joint for the air inlet end according to claim 1 or 2, characterized in that... The shaft is provided with a connecting plate with an outer diameter larger than that of the shaft at one end, and a sealing ring is installed on both sides of the cooling water tank of the sealing end cover on the end face of the connecting plate; the other end face of the sealing end cover is connected to the end face of the hollow quartz columnar blank, and a sealing ring is installed on the end face of the sealing end cover.

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