High-speed high-pressure hydraulic rotary joint

Abstract

The utility model relates to the technical field of rotary joints, and discloses a high-speed high-pressure hydraulic rotary joint which comprises a first shell, the outer wall of the first shell is detachably connected with a second shell, and the inner wall of the first shell is provided with a mounting assembly. The high-speed and high-pressure hydraulic rotary joint is provided with the polytetrafluoroethylene sealing ring, the rubber sealing ring and the metal sealing sleeve which are matched with one another, the sealing performance is greatly improved through a multi-layer composite sealing structure formed by the polytetrafluoroethylene sealing ring, the rubber sealing ring and the metal sealing sleeve, and abrasion can be effectively reduced when the hollow shaft rotates at a high speed by means of the extremely low friction coefficient of the polytetrafluoroethylene sealing ring; the sealing failure risk caused by friction is reduced, the rubber sealing ring is good in elasticity and sealing performance and can be tightly attached to a gap between the rubber sealing ring and the shell in the high-pressure environment, leakage of a hydraulic medium is blocked, the metal sealing sleeve plays a role in reinforcing sealing and protecting internal sealing pieces, and therefore the sealing effect is improved under the high-speed and high-pressure severe working condition. And the stable and reliable sealing effect can still be kept.

Description

Technical Field

[0001] This utility model relates to the field of rotary joint technology, specifically a high-speed, high-pressure hydraulic rotary joint. Background Technology

[0002] In many industrial sectors, such as aerospace, high-end machine tools, and large ships, hydraulic systems are required to stably transmit hydraulic fluid under high-speed rotation and high-pressure conditions, necessitating the use of rotary joints.

[0003] The prior art patent document CN205745800U provides a rotary joint with a gap sealing structure, including a housing and an outer tube disposed inside the housing, wherein the outer tube and the housing are gap sealed; the front end and the rear end of the housing are respectively provided with an end cap and a tail cap, both of which are sleeved on the outer tube; the outer tube is installed in the housing through a first deep groove ball bearing and a second deep groove ball bearing; the outer tube is provided with an oil inlet and an air inlet, and the outer circle of the housing is provided with an oil outlet and a leakage hole.

[0004] Although the existing technologies described above have a sealing structure to ensure sealing, the performance of the existing hydraulic rotary joints is difficult to guarantee when facing high-speed and high-pressure environments. This can easily lead to hydraulic oil leakage, which not only wastes energy but may also cause safety accidents. Secondly, the use of ordinary bearings in the device will lead to severe wear under high-speed rotation and high-pressure impact after a long period of use, requiring frequent replacement and increasing maintenance costs. Therefore, we need a high-speed and high-pressure hydraulic rotary joint. Utility Model Content

[0005] The purpose of this invention is to provide a high-speed, high-pressure hydraulic rotary joint to solve the problem mentioned in the background art that the existing sealing structure of the existing hydraulic rotary joint cannot guarantee its performance when facing high-speed, high-pressure environments.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-speed high-pressure hydraulic rotary joint, including a first housing, a second housing detachably connected to the outer wall of the first housing, and an installation component provided on the inner wall of the first housing;

[0007] The mounting assembly includes a sealing groove, and a sealing component is provided on the inner wall of the sealing groove. The inner wall of the first housing has an elongated groove, and an angular contact ball bearing is fixedly connected to the inner wall of the first housing. The inner wall of the second housing has an installation groove, and a tapered roller bearing is fixedly connected to the inner wall of the installation groove. The inner wall of the second housing has an internal channel, and a first flange is fixedly connected to the top of the second housing. Fixing bolts are provided on the outer wall of the second housing.

[0008] The sealing assembly includes a polytetrafluoroethylene (PTFE) sealing ring, and the outer wall of the PTFE sealing ring is provided with a rubber sealing ring, and the outer wall of the rubber sealing ring is provided with a metal sealing sleeve.

[0009] Preferably, the inner wall of the angular contact ball bearing is provided with a hollow shaft, and one end of the hollow shaft is fixedly connected to a second flange.

[0010] Preferably, the shape and size of the outer wall of the metal sealing sleeve match the shape and size of the inner wall of the sealing groove, and the outer wall of the metal sealing sleeve fits into the inner wall of the sealing groove.

[0011] Preferably, the inner wall shape and size of the mounting groove match the outer wall shape and size of the tapered roller bearing, and the inner wall of the mounting groove fits into the outer wall of the tapered roller bearing.

[0012] Preferably, the shape and size of the outer wall of the hollow shaft match the shape and size of the inner wall of the polytetrafluoroethylene sealing ring, and the outer wall of the hollow shaft fits into the inner wall of the polytetrafluoroethylene sealing ring.

[0013] Preferably, the first housing is fixed to the second housing by a fixing bolt, and one end of the fixing bolt is threaded through the second housing and extends into the first housing for connection.

[0014] Preferably, one end of the hollow shaft passes through an angular contact ball bearing and a polytetrafluoroethylene sealing ring and extends into a tapered roller bearing for connection.

[0015] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0016] First, this utility model features a multi-layered composite sealing structure composed of a polytetrafluoroethylene (PTFE) sealing ring, a rubber sealing ring, and a metal sealing sleeve working together to greatly improve sealing performance. The PTFE sealing ring, with its extremely low coefficient of friction, effectively reduces wear during high-speed rotation of the hollow shaft, lowering the risk of seal failure due to friction. The rubber sealing ring's excellent elasticity and sealing properties allow it to tightly fit the gap between itself and the housing under high pressure, preventing leakage of hydraulic media. The metal sealing sleeve strengthens the seal and protects the internal sealing components, ensuring a stable and reliable sealing effect even under harsh high-speed and high-pressure conditions, thus meeting people's needs.

[0017] Secondly, this utility model is equipped with a sealing groove, a long groove, an angular contact ball bearing, a mounting groove, a tapered roller bearing, an internal channel, a first flange, and fixing bolts. By combining the angular contact ball bearing and the tapered roller bearing, the stability and durability of the rotary joint under high speed and high pressure are enhanced. By installing the tapered roller bearing in a suitable position, it can withstand large axial and radial forces and adapt to the load under high pressure conditions. By installing the angular contact ball bearing in a suitable position, the high-speed rotation accuracy of the hollow shaft is ensured. The two components reasonably share the axial and radial forces, greatly reducing the wear of the bearings, extending their service life, and reducing maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the first housing and hollow shaft structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the first and second housing structures of this utility model;

[0021] Figure 4 This utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0022] The components are: 1. First housing; 2. Second housing; 3. Mounting assembly; 301. Sealing groove; 302. Long groove; 303. Angular contact ball bearing; 304. Mounting groove; 305. Tapered roller bearing; 306. Internal channel; 307. First flange; 308. Fixing bolt; 4. Sealing assembly; 401. PTFE sealing ring; 402. Rubber sealing ring; 403. Metal sealing sleeve; 5. Hollow shaft; 6. Second flange. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1-4As shown, a high-speed, high-pressure hydraulic rotary joint includes a first housing 1, a second housing 2 detachably connected to the outer wall of the first housing 1, and an installation component 3 provided on the inner wall of the first housing 1; the installation component 3 includes a sealing groove 301, and a sealing component 4 provided on the inner wall of the sealing groove 301; an elongated groove 302 is formed on the inner wall of the first housing 1, and an angular contact ball bearing 303 is fixedly connected to the inner wall of the first housing 1; an installation groove 304 is formed on the inner wall of the second housing 2, and a tapered roller bearing 305 is fixedly connected to the inner wall of the installation groove 304; an internal channel 306 is formed on the inner wall of the second housing 2, and a first flange 307 is fixedly connected to the top of the second housing 2; and a fixing bolt 308 is provided on the outer wall of the second housing 2; the sealing component 4 includes a polytetrafluoroethylene sealing ring 401, and a rubber sealing ring 402 is provided on the outer wall of the polytetrafluoroethylene sealing ring 401, and a metal sealing sleeve 403 is provided on the outer wall of the rubber sealing ring 402.

[0025] The above technical solution, which incorporates a PTFE sealing ring 401, a rubber sealing ring 402, and a metal sealing sleeve 403 working together, forms a multi-layered composite sealing structure that significantly improves sealing performance. The PTFE sealing ring 401, with its extremely low coefficient of friction, effectively reduces wear and the risk of seal failure due to friction when the hollow shaft 5 rotates at high speed. The rubber sealing ring 402, with its good elasticity and sealing properties, can tightly fit the gap between itself and the housing under high pressure, preventing leakage of hydraulic media. The metal sealing sleeve 403 strengthens the seal and protects the internal sealing components, ensuring optimal sealing performance under high pressure. Even under harsh conditions of high speed and high pressure, it can still maintain a stable and reliable sealing effect, meeting people's needs. By combining angular contact ball bearing 303 and tapered roller bearing 305, the stability and durability of the rotary joint under high speed and high pressure are enhanced. By installing tapered roller bearing 305 in a suitable position, it can withstand large axial and radial forces and adapt to the load under high pressure conditions. By installing angular contact ball bearing 303 in a suitable position, the high-speed rotation accuracy of hollow shaft 5 is guaranteed. The two reasonably share the axial and radial forces, which greatly reduces the wear of the bearings, extends the service life, and reduces maintenance costs.

[0026] Specifically, the inner wall of the angular contact ball bearing 303 is provided with a hollow shaft 5, and one end of the hollow shaft 5 is fixedly connected to a second flange 6.

[0027] Through the above technical solution, the hollow shaft 5 is hollow inside, which facilitates the passage of the medium. The second flange 6 is provided to facilitate connection with other equipment. The first flange 307 is provided on the second housing 2 to facilitate connection with other equipment.

[0028] Specifically, the shape and size of the outer wall of the metal sealing sleeve 403 match the shape and size of the inner wall of the sealing groove 301, and the outer wall of the metal sealing sleeve 403 fits into the inner wall of the sealing groove 301.

[0029] The above technical solution enhances the connection between the metal sealing sleeve 403 and the sealing groove 301, facilitates the installation of the metal sealing sleeve 403, and improves the sealing performance.

[0030] Specifically, the inner wall shape and size of the mounting groove 304 match the outer wall shape and size of the tapered roller bearing 305, and the inner wall of the mounting groove 304 fits against the outer wall of the tapered roller bearing 305.

[0031] The above technical solution enhances the connection between the mounting groove 304 and the tapered roller bearing 305, making it easier for the tapered roller bearing 305 to be installed in the mounting groove 304.

[0032] Specifically, the shape and size of the outer wall of the hollow shaft 5 match the shape and size of the inner wall of the polytetrafluoroethylene sealing ring 401, and the outer wall of the hollow shaft 5 fits into the inner wall of the polytetrafluoroethylene sealing ring 401.

[0033] The above technical solution enhances the connection between the hollow shaft 5 and the polytetrafluoroethylene sealing ring 401. The polytetrafluoroethylene sealing ring 401 itself has an extremely low coefficient of friction, which can effectively reduce wear when the hollow shaft 5 rotates at high speed.

[0034] Specifically, the first housing 1 is fixed to the second housing 2 by a fixing bolt 308, and one end of the fixing bolt 308 is threaded through the second housing 2 and extends into the first housing 1 for connection.

[0035] The above technical solution enhances the connection between the first housing 1 and the fixing bolts 308 and the second housing 2. The number of fixing bolts 308 is multiple, which facilitates fixing the first housing 1 and the second housing 2 together and also facilitates disassembly. Under long-term use, it is convenient for operators to disassemble the first housing 1 and the second housing 2 to inspect, repair or replace the internal seals and bearings.

[0036] Specifically, one end of the hollow shaft 5 passes through the angular contact ball bearing 303 and the polytetrafluoroethylene sealing ring 401 and extends into the tapered roller bearing 305 for connection.

[0037] Through the above technical solution, when the hollow shaft 5 rotates, the rotation of the hollow shaft 5 within the angular contact ball bearing 303 and the tapered roller bearing 305 is more stable.

[0038] In use, firstly, connect the first flange 307 on the second housing 2 to other equipment, and connect the second flange 6 on the hollow shaft 5 to other equipment. During transmission, the hollow shaft 5 begins to rotate under the drive of the equipment. The angular contact ball bearing 303 and the tapered roller bearing 305 provide support for the hollow shaft 5. The hollow shaft 5 rotates more stably within the angular contact ball bearing 303 and the tapered roller bearing 305. The tapered roller bearing 305, with its ability to withstand large axial and radial forces, adapts to the load under high-pressure conditions and stabilizes the axial position of the hollow shaft 5. The angular contact ball bearing 303 is installed in the long groove 302 of the first housing 1 to ensure the high-speed rotation accuracy of the hollow shaft 5. The two bearings reasonably share the axial and radial forces, making the hollow shaft 5 more stable during rotation. The hydraulic medium enters the hollow shaft 5 through the internal channel 306 for transmission, realizing hydraulic transmission between equipment. The power transmission is enhanced by the sealing component 4, which strengthens the sealing performance. The polytetrafluoroethylene (PTFE) sealing ring 401 is tightly fitted to the outer wall of the hollow shaft 5. Due to its extremely low coefficient of friction, it effectively reduces wear between the two when the hollow shaft 5 rotates at high speed, reducing the risk of seal failure due to friction. The rubber sealing ring 402 is sleeved on the outside of the PTFE sealing ring 401. Utilizing its good elasticity and sealing performance, it tightly fits the gap between the first housing 1 and the second housing 2 under high pressure, preventing hydraulic medium leakage. The outermost metal sealing sleeve 403 strengthens the sealing and protects the internal sealing components, ensuring a stable and reliable sealing effect even under harsh conditions of high speed and high pressure. This makes it difficult for the hydraulic medium to leak when the hollow shaft 5 rotates. This completes the entire work. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-speed, high-pressure hydraulic rotary joint, comprising a first housing (1), characterized in that: The outer wall of the first housing (1) is detachably connected to the second housing (2), and the inner wall of the first housing (1) is provided with an installation component (3); The mounting assembly (3) includes a sealing groove (301), and a sealing assembly (4) is provided on the inner wall of the sealing groove (301). The inner wall of the first housing (1) is provided with an elongated groove (302), and an angular contact ball bearing (303) is fixedly connected to the inner wall of the first housing (1). The inner wall of the second housing (2) is provided with a mounting groove (304), and a tapered roller bearing (305) is fixedly connected to the inner wall of the mounting groove (304). The inner wall of the second housing (2) is provided with an internal channel (306), and a first flange (307) is fixedly connected to the top of the second housing (2). A fixing bolt (308) is provided on the outer wall of the second housing (2). The sealing assembly (4) includes a polytetrafluoroethylene sealing ring (401), and a rubber sealing ring (402) is provided on the outer wall of the polytetrafluoroethylene sealing ring (401), and a metal sealing sleeve (403) is provided on the outer wall of the rubber sealing ring (402).

2. The high-speed, high-pressure hydraulic rotary joint according to claim 1, characterized in that: The inner wall of the angular contact ball bearing (303) is provided with a hollow shaft (5), and one end of the hollow shaft (5) is fixedly connected to a second flange (6).

3. The high-speed, high-pressure hydraulic rotary joint according to claim 1, characterized in that: The outer wall shape and size of the metal sealing sleeve (403) match the inner wall shape and size of the sealing groove (301), and the outer wall of the metal sealing sleeve (403) fits against the inner wall of the sealing groove (301).

4. The high-speed, high-pressure hydraulic rotary joint according to claim 1, characterized in that: The inner wall shape and size of the mounting groove (304) match the outer wall shape and size of the tapered roller bearing (305), and the inner wall of the mounting groove (304) fits against the outer wall of the tapered roller bearing (305).

5. The high-speed, high-pressure hydraulic rotary joint according to claim 2, characterized in that: The shape and size of the outer wall of the hollow shaft (5) match the shape and size of the inner wall of the polytetrafluoroethylene sealing ring (401), and the outer wall of the hollow shaft (5) fits against the inner wall of the polytetrafluoroethylene sealing ring (401).

6. The high-speed, high-pressure hydraulic rotary joint according to claim 1, characterized in that: The first housing (1) is fixed to the second housing (2) by a fixing bolt (308), and one end of the fixing bolt (308) is threaded through the second housing (2) and extends into the first housing (1) for connection.

7. The high-speed high-pressure hydraulic rotary joint according to claim 2, characterized in that: One end of the hollow shaft (5) passes through the angular contact ball bearing (303) and the polytetrafluoroethylene sealing ring (401) and extends into the tapered roller bearing (305) for connection.

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