Novel double-channel rotary joint

Abstract

The utility model discloses a novel two-channel rotary joint, which mainly comprises an elbow, a right shell, a left shell, an inner pipe body and an outer pipe body, a deep groove ball bearing and a bearing spacer bush are arranged between the left shell and the outer pipe body, the axial movement of the outer pipe body is limited by a clamp spring for combining a shaft, the axial movement of the left shell is limited by a compression end cover, and the inner pipe body and the outer pipe body are connected by a screw. A first framework oil seal is installed in an inner hole in the side, close to the right shell, of the left shell, movement of the first framework oil seal is limited through a first hole clamp spring, and a second framework oil seal, a wear-resisting ring and a second hole clamp spring are installed at the butt joint position of the elbow and a right side shaft shoulder of the inner pipe body. And the double-channel rotary joint is fixedly connected with the cold roller through the first semi-arc taper sleeve and the first flange with the conical surface, and the second semi-arc taper sleeve and the second flange with the conical surface, and is oppositely pulled, locked and fixed by the outer hexagon bolt and the hexagon nut. The framework oil seal replaces mechanical seal, is suitable for high and low temperature circulation cooling, and is reliable in sealing, long in service life and convenient to install and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to a novel double-channel rotary joint. Background Art

[0002] The dual-channel rotary joint is a mechanical component that can simultaneously transmit fluid media in two pipe spaces under a rotating working state. The two pipe spaces can transmit different or the same fluid media in and out at the same time or one in and one out. Its application field is very wide. Whether in industrial production, solar energy industry, petrochemical industry, navigation and aviation, etc., dual-channel rotary joints play a vital role.

[0003] At present, most of the existing dual-channel rotary joints use mechanical seals. When the sealing ring is sealed with resin-impregnated graphite, the service life of the resin-impregnated graphite sealing ring is short at low temperatures and it is easy to crack. When the sealing ring is sealed with silicon carbide graphite, the vibration resistance effect is poor, the installation requirements are high, and the maintenance cost is high. Especially in high-frequency high-temperature cycle applications, the use of low-temperature resistant oil seals for sealing has higher stability. Utility Model Content

[0004] In view of the above problems, the utility model provides a novel double-channel rotary joint which is suitable for high and low temperature circulation cooling and has reliable sealing and long service life.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a new type of dual-channel rotary joint, mainly composed of an elbow, a right shell, a left shell, an inner tube body, and an outer tube body, a deep groove ball bearing and a bearing spacer are installed between the left shell and the outer tube body, and the shaft uses a retaining spring to limit the axial movement of the outer tube body, and uses a clamping end cover to limit the axial movement of the left shell, thereby forming a rotary pair, two groups of deep groove ball bearings are designed in the rotary pair, the bearing spacer is arranged between the two groups of deep groove ball bearings, and the left shell A first skeleton oil seal is installed in the inner hole close to the right side of the shell body, and its movement is limited by a first hole retaining spring. A second skeleton oil seal, a wear-resistant ring, and a second hole retaining spring are installed at the joint between the elbow and the right side shoulder of the inner tube body. The connection and fixation between the dual-channel rotary joint and the cold roller are through a first semi-circular cone sleeve and a first conical flange mounted on the groove of the outer tube body of the rotary joint, and a second semi-circular cone sleeve and a second conical flange mounted on the groove of the outer tube body of the rotary joint, and are tightened and fixed by external hexagonal bolts and hexagonal nuts.

[0006] Preferably, a first sealing ring is installed in the left shoulder groove of the inner tube body.

[0007] Preferably, static sealing is achieved between the elbow and the right shell body through a second sealing ring, and static sealing is achieved between the right shell body and the left shell body through a third sealing ring.

[0008] Preferably, the first sealing ring, the second sealing ring and the third sealing ring are perfluoro O-rings, graphite sealing rings, tetrafluoroethylene sealing rings or rubber sealing rings.

[0009] Preferably, the inner tube body and the water inlet pipe of the cold roller are sealed with a sealing copper gasket.

[0010] From the above description of the structure of the utility model, it can be seen that compared with the prior art, the utility model has the following advantages:

[0011] 1. The inner tube body and the outer tube body of the utility model are both sealed with skeleton oil seals instead of mechanical seals for rotation. The overall structure is compact, the sealing effect is good, and the installation and maintenance are convenient. In addition, the wear-resistant ring and the skeleton oil seal are used in combination, which can effectively suppress mechanical vibration, and improve the service life of the dual-channel rotary joint while still ensuring the sealing of the rotating fluid medium. Especially in high and low temperature cycle applications with higher frequency, the use of high and low temperature resistant oil seals for sealing has higher stability.

[0012] 2. The connection between the double-channel rotary joint and the cold roller adopts a semi-circular cone sleeve and a flange with a conical surface to fit together and then hold the connecting shaft end tightly, and then use an external hexagonal bolt to tighten and fix it, so that the rotary joint can be installed and used in a smaller space and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0014] Figure 1 This is a main sectional view of a novel dual-channel rotary joint of the utility model;

[0015] Figure 2 This is a left view of a novel dual-channel rotary joint of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] Example

[0018] refer to Figure 1 , Figure 2A novel dual-channel rotary joint is mainly composed of an elbow 1, a right shell 2, a left shell 3, an inner tube 4, and an outer tube 6. A deep groove ball bearing 17 and a bearing spacer 5 are installed between the left shell 3 and the outer tube 6, and a retaining ring 18 is used to limit the axial movement of the outer tube 6, and a clamping end cover 16 is used to limit the axial movement of the left shell 3, thereby forming a rotary pair. Two groups of deep groove ball bearings 17 are designed in the rotary pair. The bearing spacer 5 is arranged between the two groups of deep groove ball bearings 17, which can enable the rotary joint to obtain a flatter and more stable transmission support after being installed and fixed. A first skeleton oil seal 19 is installed in the inner hole of the left shell 3 close to the right shell 2, and its movement is limited by a retaining ring 21 for the first hole. The elbow 1 is installed at the right shoulder joint of the inner tube 4 There are a second skeleton oil seal 24, a wear-resistant ring 25, and a second hole retaining spring 22. A skeleton oil seal is used, and a high and low temperature resistant skeleton oil seal is selected to ensure good sealing effect and long service life in a working environment where high and low temperatures alternate. The wear-resistant ring made of composite fiber material can effectively avoid contact between metals, has low friction, and high bearing capacity. At the same time, it can suppress mechanical vibration, and play a good transmission support role and jump compensation for the rotation of the inner tube body 4; the connection and fixation of the dual-channel rotary joint and the cold roller 11 are through the first semi-circular arc cone sleeve 8, the first conical flange 7 and the second semi-circular arc cone sleeve 10 and the second conical flange 9 mounted on the groove of the outer tube body of the rotary joint, and are tightened and fixed by the external hexagonal bolt 14 and the hexagonal nut 13.

[0019] A first sealing ring 12 is installed in the left shoulder groove of the inner tube body 4. When the rotary joint is installed, it is inserted into the return pipe of the cold roller 11. It relies on the combination of the skeleton oil seal and the wear-resistant ring, plus the ring seal, to ensure that the inner tube body can stably transport the medium without leakage when the cold roller rotates. The overall structure is simple, the sealing effect is good, and it is easy to install and maintain.

[0020] A second sealing ring 23 is used to achieve static sealing between the elbow 1 and the right housing 2 , and a third sealing ring 20 is used to achieve static sealing between the right housing 2 and the left housing 3 .

[0021] The first sealing ring 12, the second sealing ring 23 and the third sealing ring 20 are perfluoro O-rings, graphite sealing rings, tetrafluoroethylene sealing rings or rubber sealing rings. High and low temperature resistant sealing rings are selected to ensure good sealing effect and long service life in a working environment with alternating high and low temperatures.

[0022] The inner tube body 4 and the water inlet pipe of the cold roller 11 are sealed by a sealing copper gasket 15. This sealing method of the double-channel rotary joint is easy to install and maintain, has a low maintenance cost, and has good sealing effect without dripping.

[0023] When the dual-channel rotary joint is working, cooling water flows in from the water inlet of the right shell 2, then flows through the interlayer channel formed by the coaxial sleeve of the inner tube body 4 and the outer tube body 6, and then enters the cold roller. When flowing through the spiral pipe inside the cold roller, it takes away the heat and then flows out from the inner tube body 4 of the rotary joint, and finally flows out from the return water port of the variable head 1.

[0024] The utility model adopts skeleton oil seals to replace mechanical seals for the rotation of the inner tube body and the outer tube body. The overall structure is compact, the sealing effect is good, and the installation and maintenance are convenient. In addition, the wear-resistant ring and the skeleton oil seal are used in combination, which can effectively suppress mechanical vibration, and improve the service life of the dual-channel rotary joint while still ensuring the sealing of the rotating fluid medium. Especially in high-frequency high and low temperature cycle use occasions, the use of high and low temperature resistant oil seals for sealing has higher stability. The connection between the dual-channel rotary joint and the cold roller adopts a semi-circular arc cone sleeve and a flange with a conical surface to hold the connecting shaft end tightly, and then use an external hexagonal bolt to tighten and fix it, so that the rotary joint can be installed and used in a smaller space and is easy to install and maintain.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of dual-channel rotary joint, characterized by: The invention mainly comprises an elbow (1), a right housing (2), a left housing (3), an inner tube (4) and an outer tube (6); a deep groove ball bearing (17) and a bearing spacer (5) are installed between the left housing (3) and the outer tube (6); a retaining ring (18) is used to limit the axial movement of the outer tube (6); a pressing end cover (16) is used to limit the axial movement of the left housing (3), thereby forming a revolving pair; two groups of deep groove ball bearings (17) are designed in the revolving pair; the bearing spacer (5) is arranged between the two groups of deep groove ball bearings (17); a first bearing spacer (5) is installed in the inner hole of the left housing (3) close to the right housing (2); and a second bearing spacer (5) is installed in the inner hole of the left housing (3) close to the right housing (2). A skeleton oil seal (19) is provided, and its movement is limited by a first hole retaining ring (21); a second skeleton oil seal (24), a wear-resistant ring (25), and a second hole retaining ring (22) are installed at the right shoulder joint between the elbow (1) and the inner tube body (4); the connection and fixation between the dual-channel rotary joint and the cold roller (11) are through a first semi-circular cone sleeve (8) sleeved on the groove of the outer tube body of the rotary joint, a first conical flange (7) and a second semi-circular cone sleeve (10) sleeved on the groove of the outer tube body of the rotary joint, and a second conical flange (9), and are fixed by pulling and locking with an external hexagonal bolt (14) and a hexagonal nut (13).

2. According to claim 1, a novel dual-channel rotary joint is characterized in that: A first sealing ring (12) is installed in the left shoulder groove of the inner tube body (4), a second sealing ring (23) is used to achieve static sealing between the elbow (1) and the right shell (2), and a third sealing ring (20) is used to achieve static sealing between the right shell (2) and the left shell (3).

3. According to claim 2, a novel dual-channel rotary joint is characterized in that: The first sealing ring (12), the second sealing ring (23) and the third sealing ring (20) are perfluoro O-rings, graphite sealing rings, tetrafluoroethylene sealing rings or rubber sealing rings.

4. According to the novel dual-channel rotary joint of claim 1, it is characterized by: The inner tube body (4) and the water inlet pipe of the cold roller (11) are sealed by a sealing copper gasket (15).

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