CN219866408U

CN219866408U - Swivel joint

Info

Publication number: CN219866408U
Application number: CN202321034736.1U
Authority: CN
Inventors: 黄杏文; 孙文鹏
Original assignee: Liuzhou Shanhe Transmission Hydraulic Machinery Co ltd
Current assignee: Liuzhou Shanhe Transmission Hydraulic Machinery Co ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-10-20
Anticipated expiration: 2033-05-04

Abstract

The utility model discloses a rotary joint, which comprises a shell, a mandrel and a sealing element, wherein the shell is sleeved on the mandrel, the sealing element is arranged between the shell and the mandrel, a clamp spring mounting groove is formed in one end of the shell, an annular oil groove is formed in the inner wall of the shell, and a dust cover is fixedly arranged at a notch of the clamp spring mounting groove on the shell; the sealing element comprises more than two main sealing elements and primary sealing elements, a first annular sealing groove for installing the primary sealing elements and a second annular sealing groove for installing the main sealing elements are formed in the inner wall of the shell, the annular oil groove is located between two adjacent second annular sealing grooves, and the first annular sealing groove is located between the second annular sealing grooves and the end face of the shell. The utility model solves the problem of poor sealing performance of the existing rotary joint.

Description

Swivel joint

Technical Field

The utility model relates to the technical field of transmission hydraulic machinery, in particular to a rotary joint for transmission hydraulic machinery.

Background

A swivel joint is a common mechanical connection in construction machinery and specialty vehicles that allows two components to rotate when connected. The existing swivel joint comprises a shell, a mandrel, a clamp spring and sealing pieces, wherein the shell is sleeved on the mandrel, one end of the shell is provided with a clamp spring mounting groove, the clamp spring mounting groove is clamped at the shaft shoulder of the mandrel, the axial movement of the mandrel is limited, a plurality of identical sealing pieces are arranged between the shell and the mandrel, oil leakage of an oil liquid path in the swivel joint from a gap between the shell and the mandrel is avoided, and meanwhile dust and water can be prevented from entering the swivel joint from the gap to cause internal pollution. The swivel joint with the structure has the following problems due to the limitation of the installation direction and other reasons in the actual use process of the hydraulic excavator accessory: the notch of the snap spring mounting groove of the rotary joint faces upwards, and because the notch is not sealed, a large amount of accumulated water can be accumulated in the snap spring mounting groove in the use process, the snap spring, the mandrel and the shell can be corroded after long-term use, and then the rusted powder can cause abrasion to an internal sealing element in the rotary process, so that the sealing element is finally invalid, leakage is caused, and the sealing performance is poor. In addition, the used rotary joint can be eccentric-wear caused by unbalanced stress, so that the outer peripheral surface of the mandrel and the inner wall of the shell are worn, and if the wear is aggravated, the sealing failure of the rotary joint can be caused, and the reliability of the rotary joint is affected.

Disclosure of Invention

The utility model aims to provide a rotary joint which can solve the problem that the existing rotary joint is poor in sealing performance.

In order to solve the problems, the utility model adopts the following technical scheme: the rotary joint comprises a shell, a mandrel and a sealing element, wherein the shell is sleeved on the mandrel, the sealing element is arranged between the shell and the mandrel, a clamp spring mounting groove is formed in one end of the shell, an annular oil groove is formed in the inner wall of the shell, and a dust cover is fixedly arranged on the shell at a notch of the clamp spring mounting groove; the sealing element comprises more than two main sealing elements and primary sealing elements, a first annular sealing groove for installing the primary sealing elements and a second annular sealing groove for installing the main sealing elements are formed in the inner wall of the shell, the annular oil groove is located between two adjacent second annular sealing grooves, and the first annular sealing groove is located between the second annular sealing grooves and the end face of the shell.

Among the above-mentioned swivel joint's technical scheme, more specific technical scheme can also be: and the dustproof cover is provided with a grease nipple for injecting grease into the snap spring mounting groove.

Further, the dust cover is fixed in the snap spring mounting groove through interference fit, and an axial limiting structure is arranged between the outer wall of the dust cover and the inner wall of the snap spring mounting groove.

Further, a supporting ring for supporting the mandrel is arranged between the shell and the mandrel, and a supporting ring groove for installing the supporting ring is formed in the inner wall of the shell.

Further, the support ring groove is located between the annular oil groove and the second annular seal groove.

Further, the distance between the supporting ring groove and the adjacent two annular sealing grooves is more than 3 mm.

Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following beneficial effects:

1. the notch of the snap spring mounting groove of the rotary joint shell is provided with a dust cover, so that water accumulation and corrosion of parts on the end surface can be prevented; and a primary sealing element is additionally arranged between the end face of the shell and the main sealing element, so that pollutants entering a gap between the shell and the mandrel from the end face of the rotary joint can be blocked, the failure of the main sealing element is delayed, the sealing performance is improved, and the service life of the rotary joint is prolonged.

2. And the grease nipple is arranged on the dust cover, and after grease is injected into the cavity through the grease nipple, the friction coefficient between the shell and the clamp spring can be reduced, so that the abrasion of the clamp spring to the end face of the shell is reduced, and the reliability of the sealing element in the rotary joint is improved.

3. The dust cover is fixedly connected in an interference fit mode, the sealing is reliable, and the use of sealing elements and fasteners can be reduced.

4. The support ring is arranged between the mandrel and the shell, so that the coaxiality of the mandrel and the support ring can be improved, the eccentric wear phenomenon is prevented, the abrasion of the mandrel and the shell is avoided, and the service life of the rotary joint is prolonged; the supporting ring groove is formed in the annular oil groove and the second annular sealing groove, oil can lubricate the supporting ring, friction can be reduced, and failure is delayed.

5. The design of the distance between the supporting ring groove and the second annular sealing groove can ensure that the groove wall has enough strength and avoid being crushed.

Drawings

Fig. 1 is an exploded view of the present swivel joint.

Fig. 2 is a schematic view of the internal structure of the housing.

Reference numerals illustrate: 1. a dust cover; 1-1, a nozzle tip mounting hole; 2. clamping springs; 3. a gasket; 4. a housing; 4-1, a clamp spring mounting groove; 4-2, an annular oil groove; 4-3, a first annular sealing groove; 4-4, a second annular sealing groove; 4-5, a supporting ring groove; 5. a primary seal; 6. a main seal; 7. a support ring; 8. and (5) a mandrel.

Detailed Description

The utility model is further described in detail below with reference to the examples of the drawings:

the rotary joint shown in fig. 1 and 2 mainly comprises a dust cover 1, a clamp spring 2, a shell 4, a primary sealing element 5, a main sealing element 6, a supporting ring 7 and a mandrel 8, wherein the shell 4 is sleeved on the mandrel 8, the dust cover 1 is fixed at one end of the shell 1, the primary sealing element 5, the main sealing element 6 and the supporting ring 7 are arranged between the shell 4 and the mandrel 8, the primary sealing element 5 in the embodiment is an O-shaped ring, and the main sealing element 6 is a gray ring. Two annular oil grooves 4-2 are formed in the inner wall of the shell 4, and each annular oil groove 4-2 is communicated with an external oil liquid path through an oil inlet channel and an oil outlet channel. In order to improve the sealing reliability of the rotary joint, oil entering the annular oil groove 4-2 is prevented from leaking outside through a gap between the mandrel 8 and the shell 4 or pollutants such as water, dust and the like enter the rotary joint, a first annular sealing groove 4-3 and a second annular sealing groove 4-4 are arranged on the inner wall of a shaft hole of the shell 4 between each annular oil groove 4-2 and the corresponding end face of the shell 4, and the first annular sealing groove 4-3 is positioned between the second annular sealing groove 4-4 and the corresponding end face of the shell 4; a primary seal 5 is installed in the first annular seal groove 4-3, and a main seal 6 is installed in the second annular seal groove 4-4. A second annular seal groove 4-4 for installing a main seal 6 is arranged on the inner wall of the shell 4 between the two annular oil grooves 4-2 in a centered manner so as to prevent oil liquid of the two annular grooves 4-2 from flowing mutually. The inner wall of the shell 4 is provided with a support ring groove 4-2 for installing a support ring 7 between the annular oil groove 4-2 and the adjacent second annular seal groove 4-4, the inner diameter of the support ring 7 is slightly smaller than the inner diameter of the shaft hole of the shell 4, and two support rings 7 installed between the mandrel 8 and the shell 4 can effectively ensure the coaxiality between the mandrel 8 and the shell 4; the distance between the supporting ring grooves 4-5 and the adjacent two annular sealing grooves 4-4 is more than 3mm, so that the groove wall is prevented from being broken. Because there is no sealing member between the support ring 7 and the adjacent annular oil grooves 4-2, the oil flowing through the annular oil grooves 4-2 can infiltrate into the support ring 7 to lubricate the support ring 7, and the temperature of the support ring 7, the shell 4 and the mandrel 8 can not be quickly increased due to continuous friction under the lubrication action of the oil, and meanwhile, the friction between the support ring 7 and the shell is reduced, so that the support ring 7 is prevented from being damaged and failed.

The clamp spring mounting groove 4-1 for mounting the clamp spring 2 and the gasket 3 is formed in one end of the shell 4, the clamp spring 2 is clamped on the mandrel 8 to axially limit the mandrel 8, and in order to prevent end surface water accumulation corrosion parts, the dust cover 1 for sealing the clamp spring mounting groove 4-1 is fixedly mounted at the notch of the clamp spring mounting groove 4-1 of the shell 4, and the dust cover 1 of the embodiment is fixed in the clamp spring mounting groove 4-1 in a hammering mounting mode, so that the dust cover 1 and the clamp spring mounting groove 4-1 form interference fit. The outer wall of the dust cover 1 and the inner wall of the snap spring mounting groove 4-1 are provided with abutted steps at the position close to the notch to form an axial limiting structure. The dust cover 1 is also provided with a grease nipple, the center of the dust cover 1 is provided with a grease nipple mounting hole 1-1, the grease nipple is fixedly inserted into the grease nipple mounting hole 1-1, and grease can be injected into the snap spring mounting groove 4-1 through the grease nipple.

When the rotary joint is used, under the multi-seal of the dust cover 1, the butter poured into the clamp spring mounting groove 4-1, the primary seal piece 5 and the main seal piece 6, the sealing performance is greatly improved, the sealing is reliable, pollutants entering a gap between the shell 4 and the mandrel 8 from the end face of the rotary joint are blocked, even in a severe working environment, the inside of the rotary joint cannot be corroded due to the pollutants, so that the abrasion of the seal piece is avoided, and the hidden danger of liquid leakage is eliminated. The lateral moment that the swivel joint receives in the course of working can be eliminated by support ring 7 greatly, makes dabber 8 and casing 4 remain good axiality throughout, avoids dabber 8 and casing 4 contact, friction, has improved swivel joint operational reliability.

The utility model mainly solves the problem of reliability of the rotary joint sealing element by adding the supporting ring groove, modifying the waterproof performance and other schemes, and prolongs the service life of the rotary joint sealing element.

Claims

1. The utility model provides a swivel joint, includes casing, dabber and sealing member, the casing suit is in the dabber, the sealing member sets up the casing with between the dabber, jump ring mounting groove has been seted up to the one end of casing, annular oil groove, its characterized in that have been seted up to the inner wall of casing: a dust cover is fixedly arranged on the shell at the notch of the clamp spring mounting groove; the sealing element comprises more than two main sealing elements and primary sealing elements, a first annular sealing groove for installing the primary sealing elements and a second annular sealing groove for installing the main sealing elements are formed in the inner wall of the shell, the annular oil groove is located between two adjacent second annular sealing grooves, and the first annular sealing groove is located between the second annular sealing grooves and the end face of the shell.

2. The swivel joint of claim 1, wherein: and the dustproof cover is provided with a grease nipple for injecting grease into the snap spring mounting groove.

3. The swivel joint of claim 2, wherein: the dust cover is fixed in the snap spring mounting groove through interference fit, and an axial limiting structure is arranged between the outer wall of the dust cover and the inner wall of the snap spring mounting groove.

4. A swivel joint according to any one of claims 1 to 3, wherein: a supporting ring for supporting the mandrel is arranged between the shell and the mandrel, and a supporting ring groove for installing the supporting ring is formed in the inner wall of the shell.

5. The swivel joint of claim 4, wherein: the support ring groove is located between the annular oil groove and the second annular seal groove.

6. The swivel joint of claim 5, wherein: the distance between the supporting ring groove and the adjacent two annular sealing grooves is more than 3 mm.