A high speed double seal rotary union
By designing upper and lower sealing components and hard alloy rings in the rotary joint, combined with rubber gaskets, the problems of poor sealing and wear resistance under high-speed operation are solved, achieving a bidirectional sealing effect under high-speed operation and reducing equipment maintenance and operating costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG SHENGSHIDA MECHANICAL TECHNOLOGY CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-31
AI Technical Summary
Existing rotary joints have poor sealing and wear resistance under high-speed operation, leading to increased operating costs.
A high-speed double-seal rotary joint was designed, which uses upper and lower sealing components and hard alloy rings, combined with rubber gaskets to improve sealing performance and wear resistance. It also uses a hollow copper tube and reflux hole structure to achieve bidirectional sealing.
It achieves excellent sealing and wear resistance under high-speed operation, reducing equipment maintenance time and operating costs.
Smart Images
Figure CN224579936U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a double-sealed rotary joint, specifically a high-speed double-sealed rotary joint, and belongs to the field of rotary joint technology. Background Technology
[0002] As the industrial revolution deepens, some equipment needs to be cooled or heated by hot or cold water while operating at high speeds. Rotary joints are the main components for water inlet and outlet. Currently used rotary joints can be used at low speeds, but due to their structure, they have a very short lifespan and break down at high speeds.
[0003] Publication No. CN215981333U discloses a high-temperature resistant double-sealed rotary joint, which mainly solves the problems of uneven wear caused by uneven heat resistance and unreliable sealing structure. However, it still cannot solve the problems of increased equipment maintenance costs and indirectly increased operating costs caused by poor sealing and severe wear under high-speed operation. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of double-seal rotary joints under high-speed operation, which result in poor sealing and wear resistance, leading to increased operating costs. This invention provides a double-seal rotary joint that can be applied to high-speed operation, providing bidirectional sealing during high-speed operation and ensuring durability.
[0005] To solve the above problems, this application provides the following technical solution: A high-speed double-sealed rotary joint includes a housing and a hollow shaft tube. The housing has an axially extending through-hole, and a horizontal hole communicating with the through-hole is provided on one side of the housing. A return water external threaded connector is installed in the horizontal hole. From top to bottom, the through-hole sequentially houses the hollow shaft tube, an external threaded straight connector, and an internal threaded right-angle elbow. The upper part of the hollow shaft tube is fixedly installed in a hollow shaft. The upper end of the hollow shaft has a side hole communicating with the workpiece being heated or cooled. A hollow copper tube is fixedly installed in the hollow shaft tube. An upper sealing assembly is provided on the portion of the hollow shaft tube above the horizontal hole, and a lower sealing assembly is provided on the portion of the hollow shaft tube below the horizontal hole. Preferably, the upper sealing assembly includes a retaining ring for the hole mounted on the hollow tube shaft. An upper spring seat and a thrust bearing are spaced apart below the retaining ring. An upper spring is sleeved between the upper spring seat and the thrust bearing. An upper carbide moving ring and an upper carbide stationary ring are installed sequentially from top to bottom between the hollow tube shaft and the through hole between the thrust bearing and the horizontal hole. Rubber pads are installed above the upper carbide moving ring and below the upper carbide stationary ring. Preferably, the lower part of the hollow shaft tube is rotatably mounted in the through hole via an upper spring seat; Preferably, the retaining ring for the hole is located in the through hole; Preferably, the lower sealing assembly includes a lower spring seat installed in a through hole, a pipe external thread direct head below the lower spring seat, a lower spring installed between the pipe external thread direct head and the lower spring seat, the lower spring seat installed in a through hole below a hollow pipe shaft, a lower carbide dynamic ring and a lower carbide stationary ring installed sequentially from top to bottom between the hollow pipe shaft above the lower spring seat and the through hole, and a rubber pad installed below the lower carbide stationary ring; Preferably, the lower carbide moving ring is located below the horizontal hole; Preferably, the lower end of the hollow copper tube is fixedly installed in the hollow shaft tube, and the upper end passes through the hollow shaft tube and is installed in the hollow shaft; Preferably, the lower end of the hollow copper tube is provided with a water inlet pipe thread connector, the bottom of the hollow shaft tube is installed with a water inlet copper pipe, the water inlet copper pipe is provided with internal threads, and the hollow copper tube and the hollow shaft tube are connected by threads. Preferably, the upper end of the hollow copper tube is provided with an O-ring seal assembly, which seals with the inner hole of the hollow shaft; Preferably, the hollow shaft tube has multiple reflux holes on its wall, and the reflux holes are connected to the horizontal holes.
[0006] This utility model's high-speed double-seal rotary joint has sealing components on both the upper and lower parts of the hollow tube shaft, which can play a double-seal role. At the same time, the hard alloy rings in the sealing components are made of wear-resistant hard alloy material with high plane precision, which makes them have very good sealing performance and wear resistance during operation, reducing equipment maintenance time and reducing operating costs of finished products. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Diagram showing the fit of the inner shell; Figure 3 for Figure 1 A schematic diagram of the fit of the hollow shaft tube; Figure 4 for Figure 1 Schematic diagram of the structure of a hollow copper tube; Figure 5 for Figure 1 Schematic diagram of the hollow mandrel; Figure 6 for Figure 1 Usage status diagram.
[0008] In the diagram: 1. Shell, 2. Hollow shaft tube, 3. Through hole, 4. Horizontal hole, 5. Return water external thread connector, 6. Pipe external thread straight connector, 7. Pipe internal thread right angle elbow, 8. Hollow shaft. 9. Hollow copper tube; 10. Inlet pipe threaded connector; 11. Inlet copper tube; 12. O-ring seal assembly; 13. Return hole; 14. Hole retaining ring; 15. Upper spring seat; 16. Thrust bearing; 17. Upper spring; 18. Carbide moving ring; 19. Upper carbide stationary ring; 20. Rubber pad; 21. Lower spring seat; 22. Lower spring; 23. Lower carbide moving ring; 24. Lower carbide stationary ring; 25. Heating / cooling workpiece; 26. Side hole. Detailed Implementation
[0009] The following detailed embodiments of the present invention are given with reference to the accompanying drawings, which are used to further illustrate the structure of the present invention.
[0010] Example. For example... Figures 1 to 5 A high-speed double-seal rotary joint is shown, comprising a housing 1 and a hollow shaft tube 2. The housing 1 has an axial through hole 3 and a horizontal hole 4 communicating with the through hole 3 on one side. A return water external threaded connector 5 is installed in the horizontal hole 4. The hollow shaft tube 2, an external threaded straight connector 6, and an internal threaded right-angle elbow 7 are installed sequentially from top to bottom in the through hole 3. The upper part of the hollow shaft tube 2 is fixedly installed in a hollow shaft 8. The upper end of the hollow shaft 8 has a side hole 26 communicating with the workpiece being heated or cooled. A hollow copper tube 9 is fixedly installed in the hollow shaft tube 2. An upper sealing assembly is provided on the part of the hollow shaft tube 2 above the horizontal hole 4, and a lower sealing assembly is provided on the part of the hollow shaft tube 2 below the horizontal hole 4. The upper sealing assembly includes a retaining ring 14 for holes installed on the hollow tube shaft 2. An upper spring seat 15 and a thrust bearing 16 are spaced apart below the retaining ring 14. An upper spring 17 is sleeved between the upper spring seat 15 and the thrust bearing 16. An upper hard alloy moving ring 18 and an upper hard alloy stationary ring 19 are installed sequentially from top to bottom between the hollow tube shaft 2 and the through hole 3 between the thrust bearing 16 and the horizontal hole. Rubber pads 20 are installed above the upper hard alloy moving ring 18 and below the upper hard alloy stationary ring 19. After circulating through each part, the liquid returns to the hollow shaft 8 and flows into the gap cavity between the hollow shaft 8 and the hollow copper tube 9 through the side hole, returning to the hollow shaft tube 2. The hole at the upper end of the hollow shaft tube 2 uses the force of the retaining ring 14, the upper spring seat 15, the upper spring 17, and the thrust bearing 16 to press the upper carbide moving ring 18 tightly against the end face of the upper carbide stationary ring 19. Rubber pads 20 are installed above the upper carbide moving ring 18 and below the upper carbide stationary ring 19. The upper carbide moving ring 18 and the upper carbide stationary ring 19 rotate relative to each other through friction. Because the wear-resistant carbide material used for the upper carbide moving ring 18 and the upper carbide stationary ring 19 has a high degree of precision, they have very good sealing and wear resistance during operation. The lower part of the hollow shaft tube 2 is rotatably mounted in the through hole 3 via the upper spring seat 15; The retaining ring 14 for the hole is located in the through hole 3; The lower sealing assembly includes a lower spring seat 21 installed in the through hole 3. Below the lower spring seat 21 is a pipe external thread direct head 6. A lower spring 22 is installed between the pipe external thread direct head 6 and the lower spring seat 21. The lower spring seat 21 is installed in the through hole 3 below the hollow tube shaft 2. Between the hollow tube shaft 2 above the lower spring seat 21 and the through hole 3, a lower hard alloy moving ring 23 and a lower hard alloy stationary ring 24 are installed from top to bottom. A rubber pad 20 is installed below the lower hard alloy stationary ring 24. The lower cemented carbide moving ring 23 is located below the horizontal hole 4; After the liquid enters the lower cavity of the housing 1 through the internal threaded right-angle elbow 7 and the external threaded straight head 6, the lower spring 22 is subjected to an upward force on the lower spring seat 21, which can reduce the stress on the hollow tube shaft 2. The lower hard alloy moving ring 23, rubber pad 20 and lower hard alloy stationary ring 24 rotate relative to each other and rub against each other to seal the liquid. The liquid enters the hollow shaft 8 through the lower end face of the hollow copper tube 9 and the hollow shaft tube 2. Due to the relative rotational friction between the lower hard alloy moving ring 23, rubber pad 20 and lower hard alloy stationary ring 24, the force is transferred to the lower spring seat 21, which not only plays a sealing role, but also makes it durable. The lower end of the hollow copper tube 9 is fixedly installed in the hollow shaft tube 2, and the upper end passes through the hollow shaft tube 2 and is installed in the hollow shaft 8; The hollow copper tube 9 is provided with a water inlet pipe threaded connector 10 at its lower end, and a water inlet copper tube 11 is installed at the bottom of the hollow shaft tube 2. The water inlet copper tube 11 is provided with internal threads, and the hollow copper tube 9 and the hollow shaft tube 2 are connected by threads. The upper end of the hollow copper tube 9 is provided with an O-ring sealing assembly 12, which seals with the inner hole of the hollow shaft. In this embodiment, the O-ring sealing assembly 12 is the prior art and will not be described in detail here. The hollow shaft tube 2 has multiple reflux holes 13 on its tube wall, and the reflux holes 13 are connected to the horizontal holes 3.
[0011] The high-speed double-sealed rotary joint of this application comprises an inlet water pipe consisting of an internally threaded right-angle elbow 7, an externally threaded straight head 6, a housing 1, a lower sealing assembly, a hollow copper tube 9, a hollow tube shaft 2, and a hollow shaft 8. The return water pipe consists of the hollow shaft 8, hollow copper tube 9, housing 1, hollow tube shaft 2, upper sealing assembly, return hole 13, and return water externally threaded connector 5. Liquid enters through the inlet water pipe, circulates through the upper side hole 26 of the hollow shaft 8 into the workpiece 25 requiring temperature adjustment, and is recovered through the return water pipe, allowing for cyclical reuse of the liquid for cooling or heating. The specific process is as follows: After entering the lower cavity of the housing 1 through the internally threaded right-angle elbow 7 and the externally threaded straight head 6, the liquid is sealed by the lower sealing assembly. The liquid then enters the hollow shaft 8 through the threaded connection of the hollow copper tube 9 to the lower end face of the hollow tube shaft 2, and circulates through the upper side hole 26 of the hollow shaft 8 into the workpiece 25 requiring temperature adjustment. Figure 6 As shown, after circulating through each part, the liquid returns to the hollow shaft 8, flows into the gap cavity between the hollow shaft 8 and the hollow copper tube 9 through the side hole 26 of the hollow shaft 8, and returns to the hollow tube shaft 2. Due to the sealing of the upper sealing assembly, the liquid is recovered through the return hole 13 below the hollow tube shaft 2 and the return water external threaded joint 5.
[0012] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.
[0013] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.
Claims
1. A high speed double seal rotary union comprising a housing (1), a hollow shaft tube (2), characterised in that: The housing (1) has an axial through hole (3), and a horizontal hole (4) communicating with the through hole (3) is provided on one side of the housing (1). A return water external threaded connector (5) is installed in the horizontal hole (4). A hollow shaft tube (2), an external threaded straight head (6) and an internal threaded right angle elbow (7) are installed in the through hole (3) from top to bottom. The upper part of the hollow shaft tube (2) is fixedly installed in the hollow shaft (8). The upper end of the hollow shaft (8) is provided with a side hole (26) communicating with the workpiece for heating and cooling. A hollow copper tube (9) is fixedly installed in the hollow shaft tube (2). The part of the hollow shaft tube (2) above the horizontal hole (4) is provided with an upper sealing component, and the part of the hollow shaft tube (2) below the horizontal hole (4) is provided with a lower sealing component.
2. A high speed double seal rotary union according to claim 1, wherein: The upper sealing assembly includes a retaining ring (14) for holes installed on the hollow shaft tube (2). An upper spring seat (15) and a thrust bearing (16) are spaced apart below the retaining ring (14). An upper spring (17) is sleeved between the upper spring seat (15) and the thrust bearing (16). An upper carbide moving ring (18) and an upper carbide stationary ring (19) are installed from top to bottom between the hollow shaft tube (2) and the through hole (3) between the thrust bearing (16) and the horizontal hole. Rubber pads (20) are installed above the upper carbide moving ring (18) and below the upper carbide stationary ring (19).
3. A high speed double seal rotary union according to claim 2, wherein: The retaining ring (14) for the hole is located in the through hole (3).
4. A high speed double seal rotary union according to claim 1 or 2 or 3, characterised in that: The lower sealing assembly includes a lower spring seat (21) installed in the through hole (3). Below the lower spring seat (21) is a pipe external thread direct head (6). A lower spring (22) is installed between the pipe external thread direct head (6) and the lower spring seat (21). The lower spring seat (21) is installed in the through hole (3) below the hollow shaft tube (2). Between the hollow shaft tube (2) above the lower spring seat (21) and the through hole (3), a lower carbide moving ring (23) and a lower carbide stationary ring (24) are installed from top to bottom. A rubber pad (20) is installed below the lower carbide stationary ring (24).
5. A high speed double seal rotary union according to claim 4, wherein: The lower carbide moving ring (23) is located below the horizontal hole (4).
6. A high speed double seal rotary union according to claim 4, wherein: The lower end of the hollow copper tube (9) is fixedly installed in the hollow shaft tube (2), and the upper end passes through the hollow shaft tube (2) and is installed in the hollow shaft (8).
7. A high speed double seal rotary union according to claim 6, wherein: The lower end of the hollow copper tube (9) is provided with a water inlet pipe thread connector (10), and the bottom of the hollow shaft tube (2) is equipped with a water inlet copper tube (11). The water inlet copper tube (11) is provided with an internal thread, and the hollow copper tube (9) and the hollow shaft tube (2) are connected by threads.
8. A high speed double seal rotary union according to claim 7, wherein: The upper end of the hollow copper tube (9) is provided with an O-ring seal assembly (12), which seals with the inner hole of the hollow shaft.
9. A high speed double seal rotary union according to claim 8, wherein: The hollow shaft tube (2) has multiple reflux holes (13) on its tube wall, and the reflux holes (13) are connected to the horizontal holes (4).