Rotary joint for vacuumizing
By adding a sealing structure and a split rotary structure inside the vacuum pumping rotary joint, the gas leakage problem during vacuum pumping is solved, achieving more efficient vacuum maintenance and more stable operation.
Patent Information
- Application Number
- CN202422195600.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The existing rotary joints for vacuum extraction are prone to air leakage during vacuum extraction operation, resulting in the vacuum degree not meeting the expected requirements, affecting the normal operation of the equipment, and increasing energy consumption.
A rotary joint for vacuum extraction is designed. By adding a sealing structure inside the joint, the air supply pipe is extracted with a rotary turntable to achieve sealing inside the pipe body, and air leakage is prevented through a rubber plug. In addition, the bearing is placed outside the pipe body to separate the internal air extraction pipe and the external rotation structure to avoid impeded rotation.
It effectively avoids gas leakage during vacuuming, improves the stability and efficiency of vacuum degree, reduces energy consumption, and improves the operating stability of the joints.
Smart Images
Figure CN222937418U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of rotary joints, and specifically relates to a rotary joint for vacuum pumping. Background Art
[0002] A rotary joint is a precision component that plays a key role in many industrial fields. It can achieve continuous transmission of media between a fixed pipeline and a rotating device. Its structure is delicate and usually includes a sealing device and bearings inside to ensure that during high-speed rotation, the media will not leak and smooth transmission can be maintained. During the use of the rotary joint, a vacuum pumping operation may be required for the rotary joint, so a rotary joint for vacuum pumping is used.
[0003] A rotary joint for vacuum pumping usually consists of a rotating shaft, a sealing assembly, bearings, and a housing. Its working principle is: through the rotation of the rotating shaft, synchronous movement with the rotating device is achieved. During rotation, the sealing assembly plays a key role in effectively preventing air or other gases from entering, thereby maintaining the vacuum state of the system. When the rotary joint is installed in a vacuum pumping system, the rotating shaft rotates with the rotation of the device, while the housing remains relatively stationary. The seal forms a tight seal between the rotating shaft and the housing to prevent external gases from entering the vacuum system.
[0004] When the existing rotary joint for vacuum pumping performs a vacuum pumping operation, air leakage may occur, which will cause the vacuum degree not to meet the expected requirements, affecting the normal operation of related equipment. In addition, it will increase energy consumption because the system needs longer time and greater power to maintain a certain vacuum degree. And under the vacuum state, the internal components will be closely attached under the influence of air pressure, which will cause the rotation of the rotary joint to be blocked, resulting in increased difficulty in rotation during vacuum pumping and increased energy consumption. Therefore, a rotary joint for vacuum pumping is proposed to solve the above problems. Summary of the Utility Model
[0005] In order to make up for the deficiencies of the existing technology and address the problems existing in the existing equipment, the utility model proposes a rotary joint for vacuum pumping.
[0006] The technical solution adopted by the present utility model to solve its technical problems is a rotary joint for vacuum extraction, including a pipe body. A slot is opened at the top of the pipe body. A turntable is provided at the top of the slot. A transmission rod is welded to the bottom of the turntable. The transmission rod passes through the slot and is welded to a transmission gear. The transmission gear is meshed with a gear groove. A groove is opened inside the pipe body. Six groups of limit posts are provided inside the groove. A threaded chute is provided outside the limit posts. A gear groove is opened on one side of the threaded chute. A support ring is provided inside the limit post. The position height of the support ring is lower than the height of the groove. The support ring is welded to the bottom of the rotary ring. Three air supply pipes are provided inside the support ring. Threaded grooves are provided outside the air supply pipes inside the support ring. Threaded chutes are opened inside the air supply pipes inside the support ring. With this structural design, by adding a sealing structure inside the joint, the air supply pipe can be drawn out by rotating the turntable, so as to seal the inside of the pipe body, and an air stopper can be used to prevent air leakage, thereby avoiding the situation of vacuum extraction failure caused by gas leakage during the vacuum extraction process.
[0007] Preferably, the air supply pipes installed inside the support ring are rotatably connected to each other. An air stopper ring is provided on one side of the innermost air supply pipe inside the support ring. A sealing ring is provided outside the pipe body. A bearing seat is provided on one side of the sealing ring. Ball bearings are provided between the bearing seat and the sealing ring. With this structural design, by placing the bearing outside the pipe body, this design can avoid the problem of difficult rotation caused by the tight fit of the rotating part of the joint due to the vacuum extraction operation by separating the internal air extraction pipeline and the external rotating structure.
[0008] Preferably, a stepped ring is provided on the side of the pipe body away from the bearing seat. The inner diameter of the stepped ring is the same as the diameter of the air supply pipe inside the support ring. A limit ring is provided on the side of the stepped ring away from the bearing seat. The limit ring is welded to the pipe body. An air extraction port is opened at one end of the pipe body. An air outlet is opened at the other end of the pipe body corresponding to the air extraction port. By adding a stepped ring inside the tank body, the tight fit between the stepped ring and the air supply pipe can be used to increase the sealing performance of the joint, thereby increasing the efficiency of vacuum extraction of the joint and increasing the stability of the operation of the joint.
[0009] The advantages of the present utility model are as follows:
[0010] With this structural design, by adding a sealing structure inside the joint, the air supply pipe can be withdrawn by rotating the turntable, thereby sealing the inside of the pipe body. Moreover, an air leak can be prevented by using a rubber stopper, thus avoiding the situation where gas leakage during the vacuum pumping process leads to the failure of vacuum pumping. With this structural design, by placing the bearing outside the pipe body, this design can avoid the problem of difficult rotation caused by the tight fit of the rotating part of the joint due to the vacuum pumping operation by separating the internal air extraction pipeline and the external rotating structure. By adding a ladder ring inside the tank body, the tight fit between the ladder ring and the air supply pipe can be used to increase the sealing performance of the joint, thereby increasing the efficiency of vacuum pumping of the joint and also increasing the operating stability of the joint. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0012] Figure 1 It is a schematic diagram of the overall structure of the joint;
[0013] Figure 2 It is a schematic diagram of the structure of the air extraction port;
[0014] Figure 3 It is a schematic diagram of the internal structure of the joint;
[0015] Figure 4 It is a schematic diagram of the sealing structure;
[0016] Figure 5 It is a schematic diagram of the internal structure of the rotating ring;
[0017] In the figure: 1, pipe body; 2, turntable; 3, slot; 4, bearing seat; 5, air outlet; 6, transmission rod; 7, air extraction port; 8, rubber ring; 9, limit ring; 10, ladder ring; 11, ball; 12, sealing ring; 13, spiral thread; 14, rotating ring; 15, threaded chute; 16, gear groove; 17, transmission gear; 18, support ring; 19, groove; 20, limit post. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0019] Please refer to Figures 1-5 As shown, a rotary joint for vacuum pumping includes a pipe body 1. A slot 3 is opened at the top end of the pipe body 1. A turntable 2 is provided at the top end of the slot 3. A transmission rod 6 is welded to the bottom of the turntable 2. The transmission rod 6 passes through the slot 3 and is welded to a transmission gear 17. The transmission gear 17 is meshed with a gear groove 16. A groove 19 is opened inside the pipe body 1. Six groups of limit posts 20 are provided inside the groove 19. A threaded chute 15 is provided outside the limit posts 20. A gear groove 16 is opened on one side of the threaded chute 15. A support ring 18 is provided inside the limit posts 20. The position height of the support ring 18 is lower than the height of the groove 19. The support ring 18 is welded to the bottom of a rotating ring 14. Three air supply pipes are provided inside the support ring 18. Threaded grooves 13 are provided outside the air supply pipes inside the support ring 18. Threaded chutes 15 are opened inside the air supply pipes inside the support ring 18. When using the joint for vacuum pumping operation, at this time, the operator inserts the vacuum pumping device interface into the air outlet 5 respectively, and fixes the object-to-be-vacuumed interface at the air suction port 7. Then the operator rotates the turntable 2. Then, the transmission rod 6 is driven to rotate by the turntable 2. The transmission gear 17 is driven to rotate by the transmission rod 6. The gear groove 16 meshed with the transmission gear 17 is driven, and the rotating ring 14 is driven to rotate. The support ring 18 inside the rotating ring 14 is driven to rotate by the rotation of the rotating ring 14. Thus, the air supply pipes inside the support ring 18 slide out under the combined action of the threaded chute 15 and the threaded groove 13. Thus, the air supply pipes are closely attached to the stepped ring 10. When the air supply pipes continue to penetrate deeper, the rubber ring 8 outside the air supply pipe at the farthest end is inserted into the other side of the limit ring 9. Thus, the connection operation of the rotary joint is completed.
[0020] The air supply pipes installed inside the support ring 18 are rotatably connected to each other; a rubber ring 8 is provided on one side of the innermost air supply pipe of the support ring 18; a sealing ring 12 is provided on the outer side of the pipe body 1, and a bearing seat 4 is provided on one side of the sealing ring 12, and a ball 11 is provided between the bearing seat 4 and the sealing ring 12; a stepped ring 10 is provided on the side of the pipe body 1 away from the bearing seat 4. The inner diameter of the stepped ring 10 is the same as the inner diameter of the air supply pipe inside the support ring 18. The support ring 18 is located between the top of the groove 19 and the limit post 20 and is in contact with the inner wall of the air outlet 5; a limit ring 9 is provided on the side of the stepped ring 10 away from the bearing seat 4, and the limit ring 9 is welded to the pipe body 1; an air extraction port 7 is opened at one end of the pipe body 1; an air outlet 5 is opened at the other end of the pipe body 1 corresponding to the air extraction port 7; when using the joint to extract air, at this time, the operator starts the vacuum pump. Under the drive of the vacuum pump, the gas flows along the air extraction port 7 and is sent into the air supply pipe inside the limit ring 9 through the air extraction port 7. During this period, the rubber ring 8 on one side of the limit ring 9 is in close contact with the limit ring 9 under the pressure of the air pressure, thereby preventing the gas from discharging from the gap between the stepped ring 10 and the air supply pipe. After that, the gas will flow along the air supply pipe all the way to the air outlet 5 on the other side, thereby completing the vacuum extraction operation; when the joint needs to be rotated during vacuum extraction, at this time, the operator rotates the pipe body 1 on one side. At this time, the limit post 20 inside the groove 19 of the pipe body 1 will support the rotation of the pipe body 1 and thereby maintain the stability of the support ring 18, thereby separating the rotating structure and the vacuum extraction joint, and realizing the rotation of the joint during vacuum extraction in this way.
[0021] Working principle: When using the connector for vacuum pumping operation, the operator inserts the vacuum pumping device interface into the air outlet 5 and fixes the object-to-be-vacuumed interface at the air suction port 7. Then, the operator rotates the turntable 2, which drives the transmission rod 6 to rotate through the turntable 2. The transmission rod 6 drives the transmission gear 17 to rotate, and the transmission gear 17 drives the gear groove 16 meshed with it, driving the rotating ring 14 to rotate. The rotation of the rotating ring 14 drives the support ring 18 inside the rotating ring 14 to rotate. As a result, the air delivery pipe inside the support ring 18 slides out under the combined action of the thread chute 15 and the spiral thread 13, and the air delivery pipe closely fits with the stepped ring 10. When the air delivery pipe continues to penetrate, the rubber ring 8 outside the outermost air delivery pipe is inserted into the other side of the limit ring 9, thus completing the connection operation of the rotary joint. When using the connector for air suction, the operator starts the vacuum pump at this time. Driven by the vacuum pump, the gas flows along the air suction port 7 and is sent into the air delivery pipe inside the limit ring 9 through the air suction port 7. During this period, the rubber ring 8 on one side of the limit ring 9 closely fits with the limit ring 9 under the pressure of the air pressure, thus preventing the gas from discharging from the gap between the stepped ring 10 and the air delivery pipe. Then, the gas will flow along the air delivery pipe all the way to the air outlet 5 on the other side, thus completing the vacuum pumping operation. When a rotary joint is needed during vacuum pumping, the operator rotates the pipe body 1 on one side at this time. The limit post 20 inside the groove 19 of the pipe body 1 will support the rotation of the pipe body 1, thus maintaining the stability of the support ring 18, thereby separating the rotating structure and the vacuum pumping joint, and realizing the rotary joint during vacuum pumping in this way.
[0022] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0023] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.
Claims
1. A vacuum rotary joint, characterized in that: The invention comprises a tube body (1), a slot (3) is formed at the top of the tube body (1), a rotating disk (2) is formed at the top of the slot (3), a transmission rod (6) is welded to the bottom of the rotating disk (2), the transmission rod (6) passes through the slot (3) and is welded to a transmission gear (17), the transmission gear (17) is meshed with a gear groove (16); a groove (19) is formed inside the tube body (1), six groups of limit posts (20) are formed inside the groove (19), and a threaded groove ( 15), a gear groove (16) is formed on one side of the threaded groove (15); a support ring (18) is provided inside the limiting column (20), and the height of the support ring (18) is lower than the height of the groove (19); the support ring (18) is welded to the bottom of the rotating ring (14); three groups of air supply pipes are provided inside the support ring (18), and the outside of the air supply pipes inside the support ring (18) are provided with spiral patterns (13); and the inside of the air supply pipes inside the support ring (18) are provided with threaded grooves (15).
2. A vacuum rotary joint according to claim 1, characterized in that: The air supply pipes installed inside the support ring (18) are rotatably connected to each other; a rubber ring (8) is provided on one side of the air supply pipe at the innermost part of the support ring (18).
3. A vacuum rotary joint according to claim 1, characterized in that: A sealing ring (12) is provided on the outside of the tube body (1), a bearing seat (4) is provided on one side of the sealing ring (12), and a ball (11) is provided between the bearing seat (4) and the sealing ring (12).
4. A vacuum rotary joint according to claim 1, characterized in that: A step ring (10) is provided inside the tube body (1) on a side away from the bearing seat (4); the inner diameter of the step ring (10) is consistent with the diameter of the air supply pipe inside the support ring (18); the support ring (18) is located between the top of the groove (19) and the limiting column (20), and is in contact with the inner wall of the air outlet (5).
5. A vacuum rotary joint according to claim 4, characterized in that: A limiting ring (9) is provided on the side of the step ring (10) away from the bearing seat (4), and the limiting ring (9) is welded to the tube body (1).
6. A vacuum rotary joint according to claim 1, characterized in that: An air suction port (7) is provided at one end of the tube body (1); and an air outlet (5) is provided at the other end of the tube body (1) corresponding to the air suction port (7).