High-temperature and high-pressure rotating joint based on double-spring sealing

Abstract

The invention discloses a high-temperature and high-pressure rotating joint based on double-spring sealing, which comprises a seat body, a cover body fixed with the seat body, an outer pipe rotationally arranged on the seat body through a bearing, a movable sealing ring fixed on the outer pipe through a key slot, and a static sealing ring supported on the cover body, the movable sealing ring is supported on the outer pipe through the first spring, the static sealing ring is supported on the cover body through the second spring, and the supporting force of the movable sealing ring and the supporting force of the static sealing ring are parallel and opposite to each other. According to the sealing structure, the movable sealing ring and the static sealing ring are supported through the springs respectively, the two sides of the sealing mechanism are pressurized in two directions at the same time through the two springs, the attaching pressure between the movable sealing ring and the static sealing ring is larger, and the sealing effect is improved. In addition, due to the fact that the pressure is larger, the movable sealing ring and / or the static sealing ring are / is made of harder and more wear-resistant materials, abrasion is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary joints, and in particular to a high-temperature and high-pressure rotary joint based on double spring seals, which is particularly suitable for high-temperature and high-pressure working conditions. Background Art

[0002] The rotary joint is a connecting sealing component that connects the fluid medium (liquid, gas, etc.) from a stationary pipeline to the rotating equipment. It is a sealing device that solves the problems of running, bubbling, dripping, and leaking, saves energy, protects the environment, and improves working conditions.

[0003] The rotary joint is sealed by its internal sealing device, which includes a tightly fitting dynamic sealing ring and a static sealing ring. One of the two rings is made of a harder material, and the other is made of a softer, easily-worn material. During use, the sealing ring made of easily-worn material is constantly worn. In order to ensure the sealing performance, the wear needs to be compensated in real time. In existing rotary joints, a spring is usually provided in the sealing device for support, so that the dynamic sealing ring and the static sealing ring fit tightly to achieve sealing, and the spring can compensate for the wear.

[0004] The original sealing structure uses a single-sided pressure method to lock the sealing system so that the fluid will not overflow, but the existing sealing device is only suitable for environments below 15kg pressure. For working environments with pressures above 15kg or even 35kg, under high-pressure fluid, the fluid will give a reverse force to the pressurized side to cause the fluid to overflow. Therefore, the sealing structure of the existing rotary joint cannot withstand it. Some researchers have proposed replacing the materials of the dynamic sealing ring and the static sealing ring with materials with better sealing performance, but this will undoubtedly increase production costs, and the research and development of high-pressure resistant sealing materials itself also requires a large investment. Therefore, it has become an urgent need in this field to upgrade the existing structure of the rotary joint to achieve high temperature and high pressure resistance. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature and high-pressure rotary joint based on double spring seals to address the deficiencies of the prior art and to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a high-temperature and high-pressure rotary joint based on double spring seal, comprising a seat body, a cover body fixed to the seat body, an outer tube rotatably arranged on the seat body through a bearing, a dynamic sealing ring fixed to the outer tube through a keyway, and a static sealing ring supported on the cover body, wherein the dynamic sealing ring and the static sealing ring are fitted together to achieve sealing, and is characterized in that: the dynamic sealing ring is supported on the outer tube through a first spring, the static sealing ring is supported on the cover body through a second spring, and the support force of the dynamic sealing ring by the first spring is parallel and opposite to the support force of the static sealing ring by the second spring.

[0007] Furthermore, there are multiple first springs and multiple second springs, the first springs are evenly distributed in the circumference of the dynamic sealing ring, one end of the first spring is supported by the outer tube, and the other end of the first spring is supported by the dynamic sealing ring; the second springs are evenly distributed in the circumference of the static sealing ring, one end of the second spring is supported by the cover body, and the other end of the second spring is supported by the static sealing ring.

[0008] Furthermore, a hollow inner tube is concentrically arranged inside the outer tube, and a medium input channel is formed inside the inner tube for introducing the medium into the working area; a gap is formed between the inner tube and the outer tube, the dynamic sealing ring and the static sealing ring, and the gap constitutes a medium reflux channel for leading the medium out of the working area.

[0009] Furthermore, the cover body is provided with a medium inlet and a medium outlet, the rear end of the outer tube is supported on the cover body through a graphite bearing, the medium inlet is connected to the medium input channel, and the medium outlet is connected to the medium reflux channel.

[0010] More advanced, there is a chamber between the seat body and the cover body that contains the contact surface of the dynamic sealing ring and the static sealing ring, and the top of the seat body or the cover body has a pressure port that communicates with the chamber, and the pressure port is connected to a pressure device or connected to the cover body through a pipeline, so that the pressure port is connected to the medium inlet or medium outlet of the cover body. The pressure medium in the cover body is introduced into the pressure port to offset the internal and external pressure difference of the sealing mechanism, so that the sealing mechanism can adapt to high-pressure working conditions.

[0011] In addition, the present invention also claims protection for a sealing structure for a high-temperature and high-pressure rotary joint, comprising a dynamic sealing ring and a static sealing ring, wherein the dynamic sealing ring is arranged on a rotating component through a keyway, and the static sealing ring is supported on a stationary component, and the dynamic sealing ring and the static sealing ring are fitted together to achieve sealing, and is characterized in that: the dynamic sealing ring is supported on the rotating component through a first spring, and the static sealing ring is supported on the stationary component through a second spring, and the support force of the dynamic sealing ring by the first spring is parallel and opposite to the support force of the static sealing ring by the second spring.

[0012] Furthermore, there are a plurality of the first springs and a plurality of second springs, wherein the first springs are evenly distributed in the circumference of the dynamic sealing ring, one end of the first spring is supported by the rotating component, and the other end of the first spring is supported by the dynamic sealing ring, and the second springs are evenly distributed in the circumference of the static sealing ring, one end of the second spring is supported by the static component, and the other end of the second spring is supported by the static sealing ring.

[0013] The beneficial effects of the present invention are as follows:

[0014] The dynamic sealing ring and the static sealing ring in the sealing structure of the present invention are supported by springs respectively. The double springs realize the simultaneous bidirectional pressurization of the two sides of the sealing mechanism, so that the fitting pressure between the dynamic sealing ring and the static sealing ring is greater, thereby improving the sealing effect. In addition, due to the greater pressure, it is recommended to select a harder and more wear-resistant material for the dynamic sealing ring and / or the static sealing ring to reduce wear and extend the service life. The present invention uses multiple springs to support the dynamic sealing ring and the static sealing ring, so that the elastic force that pushes the seal is more evenly distributed, the dynamic sealing ring and the static sealing ring fit more closely, and the sealing performance of the sealing mechanism is further improved, while preventing eccentric wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of a high-temperature and high-pressure rotary joint with dual flow channels and dual spring seals. Figure 2 It is a cross-sectional view of a single-channel high-temperature and high-pressure rotary joint based on double spring seals.

[0016] The numbers in the figure are as follows:

[0017] 1-cover body; 2-seat body; 3-outer tube; 4-dynamic sealing ring; 5-static sealing ring; 6-first spring; 62-second spring; 7-spacer ring; 8-bearing; 91-first O-ring; 92-second O-ring; 10-spring pin; 11-inner retaining ring; 12-outer retaining ring; 13-headed hexagon socket screw; 14-spring washer; 15-oil nozzle, 16-oil drain screw; 17-elbow; 18-bolt; 19-graphite bearing; 20-retaining ring; 21-red copper gasket; 22-inner tube. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1

[0020] See also Figure 1The present embodiment is a dual-channel high-temperature and high-pressure rotary joint based on double spring seals, including a seat body 2 and a cover body 1 fixed to one side of the seat body 2. In this example, the seat body 2 and the cover body 1 are fixed together by headed hexagon socket screws and spring washers. The seat body 2 is provided with a step hole, and a hollow outer tube 3 is rotatably arranged in the step hole through a bearing 8. The outer tube 3 is fixed to the roller and rotates with the roller. The outer tube 3 (rotating part) is supported by a dynamic sealing ring 4 through a first spring 61, and the cover body 1 (stationary part) has a static sealing ring 5 through a second spring 62. The dynamic sealing ring 4 fits with the static sealing ring 5 to achieve sealing.

[0021] like Figure 1 As shown, a red copper gasket 21 is sleeved on the outer tube 3, and the red copper gasket 21 is clamped by the roller and the shoulder of the outer tube 3 to stop leakage and prevent the refluxed coolant from flowing out of the sealing structure between the outer tube and the roller. The cover body 1 is provided with a medium inlet and a medium outlet. The rear end of the outer tube 3 is supported on the cover body 1 by a supporting component (graphite bearing 19 is selected in this example). The medium inlet is connected to the medium input channel, and the medium outlet is connected to the medium return channel. Figure 1 In the embodiment shown, a hollow inner tube 22 is concentrically arranged inside the outer tube 3, a medium input channel is formed inside the inner tube 22 for introducing the medium into the working area, and a gap is formed between the inner tube 22 and the outer tube 3, the dynamic sealing ring 4 and the static sealing ring 5, and the gap constitutes a medium reflux channel for leading the medium out of the working area. The arrow in the figure indicates the flow direction of the medium.

[0022] In this embodiment, a countersunk hole for placing the dynamic sealing ring 4 is opened at the tail of the outer tube 3, and a plurality of spring holes are evenly opened around the countersunk hole. The dynamic sealing ring 4 is slidably set in the countersunk hole of the outer tube through a keyway. The cross section of the dynamic sealing ring 4 is stepped (can be a plane or an inclined surface), and a first O-ring 91 is pressed between the outer tube 3 to prevent leakage of the medium. A first spring 61 is placed in the spring hole so that the first spring 61 is evenly distributed around the circumference of the dynamic sealing ring 4. One end of the first spring 61 is supported on the bottom of the spring hole of the outer tube 3, and the other end of the first spring 61 is supported on the tail of the dynamic sealing ring 4. Figure 1As shown, the cover body 1 supports the static sealing ring 5 through multiple second springs 62. Specifically, the cross section of the cover body 1 is uniformly provided with multiple spring holes along the circumference, and the second spring 62 is placed in the spring hole, and the spring pin 10 is inserted. The static sealing ring 5 is provided with corresponding pin holes. When installing, the pin hole is aligned with the spring pin 10 and inserted, so that the second spring 62 is evenly distributed in the circumference of the static sealing ring 5. One end of the second spring 62 is supported on the bottom of the spring hole of the cover body 1, and the other end of the second spring 62 is supported on the back of the static sealing ring 5. The cross section of the static sealing ring 5 is stepped (it can be a plane or an inclined surface), and a second O-ring 92 is pressed between the cover body 1, and the second O-ring 92 prevents leakage of the medium. Under the elastic support of the bidirectional spring, the dynamic sealing ring 4 and the static sealing ring 5 are tightly fitted to achieve sealing. Among them, the support force of the first spring 61 on the dynamic sealing ring 4 is parallel and opposite to the support force of the second spring 62 on the static sealing ring 5. In addition, a single spring solution is also feasible, that is, only including a first spring 61 and a second spring 62, a first spring, or a first spring 61 and multiple second springs 62, or multiple first springs 61 and a second spring 62. Such configurations are all feasible. The original intention of the present invention is to provide a greater clamping force through the application of springs on both sides to adapt to high temperature and high pressure working conditions to prevent coolant leakage.

[0023] In order to lubricate the sealing component, in this embodiment, a chamber is provided between the seat body 2 and the cover body 1 to contain the contact surface of the dynamic sealing ring 4 and the static sealing ring 5. The top of the cover body 1 (which can also be provided at the top of the seat body 2) has an oil filling port connected to the chamber. By injecting lubricating oil into the oil filling port, the lubricating sealing mechanism can be lubricated. The oil filling port can be blocked by a bolt 18. Since the internal and external pressure difference is large, in order to reduce the pressure difference, a pressure device can be connected to the oil filling port (which can also be defined as a pressure port) to balance the internal and external pressure difference. Another feasible solution is to introduce a pressure medium from the cover body 1 into the pressure port to offset the internal and external pressure difference of the sealing mechanism, thereby making the mechanism have better pressure resistance. Specifically, the pressure port can be connected to the medium inlet or the medium outlet by setting a pipeline to connect the cover body (1).

[0024] like Figure 1 As shown, in this embodiment, there are two bearings 8 in total. The two bearings 8 are placed in the stepped hole at the front of the seat body 2 and separated by the spacer ring 7. The seat body 2 is provided with a grease nipple 15 located above the spacer ring 7 and a drain screw 16 located below the spacer ring 7. Lubricating oil is injected through the grease nipple 15 to lubricate the bearing 8, but when the lubricating oil needs to be discharged, the drain screw 16 can be removed. After the bearing is installed, the bearing 8 needs to be positioned to prevent it from falling. In this example, an inner retaining ring 11 for axially limiting the inner ring of the bearing 8 is provided on the outer tube 3, and an outer retaining ring 12 for axially limiting the outer ring of the bearing 8 is provided on the seat body 2.

[0025] It can be seen that the present embodiment discloses a sealing structure for a high-temperature and high-pressure rotary joint, which includes a dynamic sealing ring 4 and a static sealing ring 5. The dynamic sealing ring 4 is provided on the rotating component (outer tube 3) through a keyway, and the static sealing ring 5 is supported on the stationary component (cover body 1). The dynamic sealing ring 4 and the static sealing ring 5 are fitted to achieve sealing. The dynamic sealing ring 4 is supported on the rotating component (outer tube 3) through a first spring 61, and the static sealing ring 5 is supported on the stationary component (cover body 1) through a second spring 62. The support force of the first spring 61 on the dynamic sealing ring 4 is parallel and opposite to the support force of the second spring 62 on the static sealing ring 5.

[0026] Embodiment 2

[0027] See also Figure 2 This embodiment is a single-channel high-temperature and high-pressure rotary joint based on double spring seals. Its main structure is similar to that of the first embodiment, except that it does not contain the inner tube 22. The coolant flows in (or out) through the elbow 17 on the cover 1, and flows into the drum through the sealing structure and the outer tube 3 in turn. A single-channel rotary joint is also correspondingly provided at the other end of the drum, because the medium in the drum is led out. The numbers and connection relationships of the other components in the figure refer to the first embodiment, and will not be repeated here.

[0028] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sealing structure for a high-temperature and high-pressure rotary joint, comprising a dynamic sealing ring (4) and a static sealing ring (5), wherein the dynamic sealing ring (4) is arranged on a rotating component through a keyway, and the static sealing ring (5) is supported on a stationary component, and the dynamic sealing ring (4) and the static sealing ring (5) are fitted together to achieve sealing, and the characteristics are as follows: The dynamic sealing ring (4) is supported on the rotating component via a first spring (61), and the static sealing ring (5) is supported on the stationary component via a second spring (62). The supporting force of the first spring (61) on the dynamic sealing ring (4) and the supporting force of the second spring (62) on the static sealing ring (5) are parallel and opposite.

2. The sealing structure for a high temperature and high pressure rotary joint according to claim 1, characterized in that: The first spring (61) and the second spring (62) are provided in one or more pieces; when there are a plurality of first springs (61) and a plurality of second springs (62), the first springs (61) are evenly distributed in the circumference of the dynamic sealing ring (4), one end of the first spring (61) is supported on a rotating component, and the other end of the first spring (61) is supported on the dynamic sealing ring (4); the second springs (62) are evenly distributed in the circumference of the static sealing ring (5), one end of the second spring (62) is supported on a static component, and the other end of the second spring (62) is supported on the static sealing ring (5).

3. A high-temperature and high-pressure rotary joint based on a double spring seal, comprising a seat body (2), a cover body (1) fixed to the seat body (2), an outer tube (3) rotatably arranged on the seat body (2) via a bearing (8), a dynamic sealing ring (4) fixed to the outer tube (3) via a keyway, and a static sealing ring (5) supported on the cover body (1), wherein the dynamic sealing ring (4) and the static sealing ring (5) are fitted together to achieve sealing, and characterized in that: The dynamic sealing ring (4) is supported on the outer tube (3) via a first spring (61), and the static sealing ring (5) is supported on the cover body (1) via a second spring (62); the support force of the first spring (61) on the dynamic sealing ring (4) and the support force of the second spring (62) on the static sealing ring (5) are parallel and opposite.

4. The high temperature and high pressure rotary joint based on double spring seal according to claim 3, characterized in that: The first spring (61) and the second spring (62) are provided in one or more forms; when there are multiple first springs (61) and multiple second springs (62), the first springs (61) are evenly distributed in the circumference of the dynamic sealing ring (4), one end of the first spring (61) is supported on the outer tube (3), and the other end of the first spring (61) is supported on the dynamic sealing ring (4); the second springs (62) are evenly distributed in the circumference of the static sealing ring (5), one end of the second spring (62) is supported on the cover body (1), and the other end of the second spring (62) is supported on the static sealing ring (5).

5. The high temperature and high pressure rotary joint based on double spring seal according to claim 3, characterized in that: There are two bearings (8) as described above, which are placed in the countersunk hole at the front of the seat body (2) and separated by a spacer ring (7). The seat body (2) is provided with a grease nipple (15) located above the spacer ring (7) for adding lubricating oil to lubricate the bearings (8) and an oil drain screw (16) located below the spacer ring (7) for draining the lubricating oil.

6. The high temperature and high pressure rotary joint based on double spring seal according to claim 3, characterized in that: The cross section of the dynamic sealing ring (4) is in the shape of a step, a plane or an inclined surface, and a first O-type sealing ring (91) is pressed between the dynamic sealing ring (4) and the outer tube (3). The cross section of the static sealing ring (5) is in the shape of a step, a plane or an inclined surface, and a second O-type sealing ring (92) is pressed between the static sealing ring (5) and the cover body (1).

7. The high temperature and high pressure rotary joint based on double spring seal according to claim 3, characterized in that: The cover body (1) is provided with an elbow (17) serving as a medium inlet or a medium outlet.

8. The high temperature and high pressure rotary joint based on double spring seal according to claim 3, characterized in that: A hollow inner tube (22) is concentrically arranged inside the outer tube (3), and a medium input channel is formed inside the inner tube (22) for introducing the medium into the working area; a gap is formed between the inner tube (22) and the outer tube (3), the dynamic sealing ring (4) and the static sealing ring (5), and the gap constitutes a medium reflux channel for leading the medium out of the working area; the cover body (1) is provided with a medium inlet and a medium outlet, the rear end of the outer tube (3) is supported on the cover body (1) by a supporting component, the medium inlet is connected to the medium input channel, and the medium outlet is communicated with the medium reflux channel.

9. The high temperature and high pressure rotary joint based on double spring seal according to claim 3, characterized in that: A chamber is provided between the seat body (2) and the cover body (1) to contain the contact surface between the dynamic sealing ring (4) and the static sealing ring (5); the top of the seat body (2) or the cover body (1) has an oil filling port connected to the chamber and is sealed by a bolt (18).

10. The high temperature and high pressure rotary joint based on double spring seal according to claim 3, characterized in that: A chamber is provided between the seat body (2) and the cover body (1) to contain the contact surface between the dynamic sealing ring (4) and the static sealing ring (5); the top of the seat body (2) or the cover body (1) has a pressure port connected to the chamber; the pressure port is connected to a pressure device or to the cover body (1) via a pipeline and is connected to a medium inlet or a medium outlet.

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