A multi-stage condensation sealing device for oil and vapor

Abstract

This invention provides a multi-stage condensation sealing device for oil and vapor, comprising: an expansion joint, one end of which is tightly fitted onto an oil and vapor conveying pipe; a rotating ring, comprising a rotating connecting ring, a rotating sealing ring, and a rotating toothed ring, wherein the rotating connecting ring is tightly fitted onto the tank outlet pipe, the rotating sealing ring is connected to the rotating connecting ring, and two or more rotating toothed rings are provided on the rotating sealing ring; a stationary ring, comprising a first stationary connecting ring, a second stationary connecting ring, a stationary sealing ring, and a stationary toothed ring, wherein the first stationary connecting ring is connected to the expansion joint, the second stationary connecting ring is connected to the first stationary connecting ring, the stationary sealing ring covers the rotating ring, and two or more stationary toothed rings are distributed on the stationary sealing ring, with the rotating toothed rings and stationary toothed rings interlaced, and a condensate outlet is provided at the bottom of the stationary sealing ring; a first cooling water jacket and a second cooling water jacket, forming a first cooling water chamber and a second cooling water chamber. This device can seal the rotating connection between the tank outlet pipe and the oil and vapor conveying pipe, providing good sealing performance and a long service life.

Description

Technical Field

[0001] This invention relates to the field of mechanical seal technology, and in particular to a multi-stage oil-vapor condensation sealing device. Background Technology

[0002] In the chemical industry, oil and gas tanks are connected to oil and gas delivery pipes, through which the oil and gas medium inside the tanks is transported. Oil and gas tanks are prone to radial and axial movement. If the tank and delivery pipe are rigidly connected, the delivery pipe will follow the radial and axial movement of the tank, generating loads in both and easily causing damage to the connections on both surfaces.

[0003] Therefore, currently, a tank outlet pipe is usually connected between the oil and gas tank body and the oil and gas transmission pipe. The tank outlet pipe is rigidly connected to the oil and gas tank body, and rotatably connected to the oil and gas transmission pipe. At this time, the tank outlet pipe swings radially and moves axially synchronously with the oil and gas tank body. Since the tank outlet pipe is rotatably connected to the oil and gas transmission pipe, the load of radial swing and axial movement will not be transmitted to the oil and gas transmission pipe, thus avoiding the generation of loads at various connection points on the oil and gas transmission pipe.

[0004] However, since oil and gas media are generally gaseous and their temperatures usually exceed 200°C or even 500°C, the gaseous oil and gas media may leak out from the rotating connection between the tank outlet pipe and the oil and gas delivery pipe during radial oscillation and axial movement. The composition of oil and gas media is very complex, including gasoline, diesel, chemical solvents, acids, alkalis, etc., which are usually dangerous and hazardous. In order to prevent gas leakage, a sealing device needs to be installed at the rotating connection between the tank outlet pipe and the oil and gas delivery pipe. Summary of the Invention

[0005] This invention provides a multi-stage condensation sealing device for oil and gas, which can seal the rotating connection between the tank outlet pipe and the oil and gas delivery pipe, with good sealing effect and long service life.

[0006] The technical solution used to achieve the above-mentioned objective of this invention is as follows:

[0007] A multi-stage condensation sealing device for oil and vapor is installed at the rotatable connection between the tank outlet pipe and the oil and vapor delivery pipe. The multi-stage condensation sealing device for oil and vapor includes:

[0008] The expansion joint is ring-shaped, with one end tightly fitted onto the oil and gas transmission pipe.

[0009] The moving ring includes a moving connecting ring, a moving sealing ring, and a moving toothed ring. The moving connecting ring is arranged axially and tightly fitted onto the tank outlet pipe. The moving sealing ring is arranged radially and connected to the middle of the outer circumference of the moving connecting ring. The moving toothed ring is arranged axially and two or more are symmetrically distributed on both sides of the moving sealing ring.

[0010] The stationary ring includes a first stationary connecting ring, a second stationary connecting ring, a stationary sealing ring, and a stationary toothed ring. The first stationary connecting ring is arranged radially and connected to the end of the expansion joint away from the oil and gas conveying pipe. The second stationary connecting ring is arranged axially and connected to the inner circumference of the first stationary connecting ring. The first stationary connecting ring extends to the side away from the expansion joint and connects to the stationary sealing ring. The stationary sealing ring has a C-shaped cross section and covers the dynamic sealing ring and the dynamic toothed ring. The stationary toothed ring is arranged axially and two or more are symmetrically distributed on the two inner sides of the stationary sealing ring. The dynamic toothed ring and the stationary toothed ring are interlaced. The oil and gas conveying pipe, the expansion joint, the tank outlet pipe, the dynamic ring, and the stationary ring together form a sealing cavity. The bottom of the stationary sealing ring is provided with a condensate outlet that connects the sealing cavity to the outside.

[0011] The first cooling water jacket and the second cooling water jacket are both annular in shape, with one end connected to the outer circumference of the static sealing ring on both sides of the condensate outlet. The other end of the first cooling water jacket is connected to the side of the static sealing ring near the expansion joint and close to the inner circumference, or to the outer circumference of the second static connecting ring, or to the side of the first static connecting ring away from the expansion joint, so that the first cooling water jacket and the static sealing ring, or the first cooling water jacket and the static sealing ring and the second static connecting ring, or the first cooling water jacket and the static sealing ring together form a first cooling water cavity. The other end of the second cooling water jacket is connected to the side of the static sealing ring away from the expansion joint and close to the inner circumference, so that the second cooling water jacket and the static sealing ring together form a second cooling water cavity.

[0012] The static sealing ring is a split structure, consisting of two L-shaped annular components spliced ​​together; each of the two annular components has a splicing ring connected radially on its outer circumference, and the two annular components are connected through the splicing ring. The condensate outlet passes through the static sealing ring and the splicing ring, thereby connecting the sealing cavity to the outside.

[0013] The first cooling water jacket is connected to the outer circumference of the second static connecting ring and the side of the splicing ring near the expansion joint. The second cooling water jacket is connected to the inner circumference of the static sealing ring away from the expansion joint and the side of the splicing ring away from the expansion joint.

[0014] The top of the first cooling water jacket and the second cooling water jacket are respectively provided with cooling water inlets that connect to the outside and the first cooling water cavity, and to the outside and the second cooling water cavity. The bottom of the first cooling water jacket and the second cooling water jacket are respectively provided with cooling water outlets that connect to the outside and the first cooling water cavity, and to the outside and the second cooling water cavity.

[0015] The outer circumference of the moving connecting ring, the moving toothed ring, and the stationary toothed ring are all distributed with annular first grooves. Annular sealing packing is embedded in each of the first grooves. The outer circumference of the sealing packing on the moving connecting ring and the moving toothed ring contacts and seals with the nearby stationary toothed ring or stationary sealing ring. The outer circumference of the sealing packing on the stationary toothed ring contacts and seals with the nearby moving toothed ring.

[0016] The stationary gear ring is provided with an X-shaped sealing lip on the end near the moving sealing ring, and the sealing lip contacts and seals with the moving gear ring.

[0017] The static sealing ring also covers the dynamic connecting ring. The inner circumference of the static sealing ring near both sides is provided with annular second grooves. Sealing filler is embedded in each of the second grooves, and the sealing filler contacts and seals with the outlet pipe of the tank.

[0018] The expansion joint includes a first connecting part, an n-shaped expansion section and a second connecting part connected in sequence. The first connecting part is arranged axially and tightly fixed on the oil and gas conveying pipe. The n-shaped expansion section is provided in more than one section. The second connecting part is arranged radially and fixedly connected to the first static connecting ring.

[0019] The condensate outlet is connected to a condensate collection tank.

[0020] The inner circumference of the moving connecting ring is provided with an annular third groove, and heat insulation cotton is embedded in the third groove. The heat insulation cotton is in contact with and sealed to the outlet pipe of the tank.

[0021] Compared with the prior art, the oil-vapor multi-stage condensation sealing device provided by the present invention has the following advantages: 1. The oil-vapor multi-stage condensation sealing device provided by the present invention can seal the rotating connection between the tank outlet pipe and the oil-vapor conveying pipe. It adapts to the radial swing and axial movement of the tank outlet pipe through the expansion joint, so that the sealing device can adapt to the radial swing and axial movement of the tank outlet pipe as a whole. In addition, the dynamic ring and the static ring are interlaced to form a multi-stage labyrinth seal, and at the same time, contact sealing is achieved through sealing packing or sealing lip, resulting in a good sealing effect.

[0022] 2. In this invention, a first cooling water chamber and a second cooling water chamber are provided on the outer side of the stationary ring and the rotating ring. This can condense the oil vapor that leaks into the sealing chamber. Moreover, due to the multi-stage tortuous sealing chamber, the oil vapor is condensed and depressurized step by step, further preventing the oil vapor from leaking out and causing damage. At the same time, condensing the oil vapor can also protect the stationary ring and the rotating ring and extend their service life.

[0023] 3. The present invention is provided with a condensation medium outlet, which can collect the oil vapor condensed into liquid state to prevent leakage and environmental damage.

[0024] 4. In this invention, the static sealing ring is a split structure, which facilitates the installation of the static ring and makes the entire sealing device simple and convenient to install.

[0025] 5. In this invention, the static sealing ring also covers the dynamic connecting ring. Sealing filler is embedded on the inner circumference of the static sealing ring near both sides, and heat insulation cotton is embedded on the inner circumference of the dynamic connecting ring. Both the sealing filler and the heat insulation cotton are in contact with the tank outlet pipe for sealing, further improving the sealing effect. Attached Figure Description

[0026] Figure 1 A schematic diagram of the overall structure of the oil-vapor multi-stage condensation sealing device provided in Example 1;

[0027] Figure 2 This is a partial structural schematic diagram of the oil-vapor multi-stage condensation sealing device provided in Example 2;

[0028] Figure 3 This is a partial structural schematic diagram of the oil-vapor sealing device provided in Example 3;

[0029] In the diagram: 100-oil / gas tank body, 101-flange, 200-tank outlet pipe, 300-oil / gas delivery pipe, 1-expansion joint, 11-first connection part, 12-n-type expansion section, 13-second connection part, 21-moving connection ring, 22-moving sealing ring, 23-moving toothed ring, 31-first static connection ring, 32-second static connection ring, 33-static sealing ring, 34-static toothed ring, 35-splitting ring, 4-sealing cavity, 5-sealing packing, 61-first cooling water jacket, 62-second cooling water jacket, 63-first cooling water cavity, 64-second cooling water cavity, 65-cooling water inlet, 66-cooling water outlet, 71-condensate outlet, 72-condensate collection box, 8-sealing lip, 9-insulation cotton. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following embodiments.

[0031] Example 1

[0032] The structure of the oil-vapor multi-stage condensation sealing device provided in this embodiment is as follows: Figure 1 As shown, it is installed at the rotatable connection between the tank outlet pipe 200 and the oil and gas conveying pipe 300, and is fixedly connected to the oil and gas tank 100 through flange 101. The tank outlet pipe swings radially and moves axially with the oil and gas tank.

[0033] The oil-gas multi-stage condensation sealing device includes an expansion joint 1, a dynamic ring, a stationary ring, a first cooling water jacket, and a second cooling water jacket.

[0034] The expansion joint is generally annular, with one end tightly fitted onto the oil and gas delivery pipe. Specifically, the expansion joint includes a first connecting part 11, an n-shaped expansion section 12, and a second connecting part 13 connected in sequence. The first connecting part is axially arranged and tightly fitted onto the oil and gas delivery pipe. It can be further secured to the oil and gas delivery pipe using fasteners such as clamps. The first connecting part can also be made of metal and welded to the oil and gas delivery pipe. The n-shaped expansion section has more than one segment; in this embodiment, two segments are provided. The expansion joint is used to accommodate the radial oscillation and axial movement of the tank outlet pipe.

[0035] The moving ring includes a moving connecting ring 21, a moving sealing ring 22, and a moving toothed ring 23. The moving connecting ring is arranged axially and tightly fitted onto the tank outlet pipe. The moving sealing ring is arranged radially and connected to the middle of the outer circumference of the moving connecting ring. The moving toothed ring is arranged axially, and two or more are symmetrically distributed on both sides of the moving sealing ring. In this embodiment, six moving toothed rings are symmetrically distributed. The moving connecting ring, the moving sealing ring, and the moving toothed ring are connected as an integral structure.

[0036] The stationary ring includes a first stationary connecting ring 31, a second stationary connecting ring 32, a stationary sealing ring 33, and a stationary toothed ring 34. The first stationary connecting ring is arranged radially and connected to the end of the expansion joint away from the oil and gas delivery pipe, i.e., it is fixedly connected to the second connecting part of the expansion joint. The two can be fixedly connected by bolts. The second stationary connecting ring is arranged axially and connected to the inner circumference of the first stationary connecting ring. The first stationary connecting ring extends to the side away from the expansion joint and connects to the stationary sealing ring. The stationary sealing ring has a C-shaped cross-section and covers the moving sealing ring and the moving toothed ring. The stationary toothed ring is arranged axially and two or more are symmetrically distributed on the two inner sides of the stationary sealing ring. The moving toothed ring and the stationary toothed ring are interlaced. In this embodiment, there are six stationary toothed rings symmetrically distributed. Correspondingly, the oil and gas delivery pipe, the expansion joint, the tank outlet pipe, the moving ring, and the stationary ring together form the sealing cavity 4. The sealing cavity is a multi-stage tortuous labyrinth sealing cavity, which gradually depressurizes the gas and prevents gas leakage.

[0037] The outer circumferences of the moving connecting ring, moving toothed ring, and stationary toothed ring are all distributed with annular first grooves. Each of these first grooves is embedded with annular sealing packing 5. The outer circumference of the sealing packing on the moving connecting ring and moving toothed ring contacts and seals with the adjacent stationary toothed ring or stationary sealing ring, while the outer circumference of the sealing packing on the stationary toothed ring contacts and seals with the adjacent moving toothed ring. Through labyrinth sealing and contact sealing, multi-stage sealing of oil and gas is achieved, preventing leakage and potential hazards.

[0038] Because the oil vapor has a high temperature, it greatly affects the lifespan of the sealing device. Furthermore, excessive gas leakage may accumulate and leak within the sealing device. Therefore, in this embodiment, a first cooling water jacket 61 and a second cooling water jacket 62 cover the outer circumference of the static sealing ring, forming a first cooling water chamber 63 and a second cooling water chamber 64. A condensation medium outlet 71 is provided. By circulating cooling water between the first and second cooling water chambers, the entire sealing cavity is cooled. This improves the lifespan of the sealing device. Additionally, gaseous substances condense into liquid when the temperature drops, minimizing the risk of leakage even if it occurs. Moreover, the condensed oil vapor in this sealing device can flow out through the condensation medium outlet, preventing leakage.

[0039] Specifically, the condensate outlet is located at the bottom of the static sealing ring and connects the sealing cavity to the outside, and the condensate outlet is connected to a condensate collection tank 72. The reason for setting up two cooling water jackets is also to facilitate the connection between the sealing cavity and the outside.

[0040] Therefore, one end of the first and second cooling water jackets are respectively connected to the outer circumference of the static sealing ring on both sides of the condensate outlet, avoiding the inconvenience of the condensate outlet needing to pass through two cooling water chambers. Both the first and second cooling water jackets are annular in shape.

[0041] The other end of the first cooling water jacket is connected to the side of the static sealing ring near the expansion joint and close to the inner circumference, or to the outer circumference of the second static connecting ring, or to the side of the first static connecting ring away from the expansion joint, so that the first cooling water jacket and the static sealing ring, or the first cooling water jacket and the static sealing ring and the second static connecting ring, or the first cooling water jacket and the static sealing ring and the second static connecting ring together form the first cooling water cavity.

[0042] In this embodiment, the other end of the first cooling water jacket is connected to the outer circumference of the second static connecting ring and the outer circumference of the static sealing ring, so that the first cooling water jacket, the second static connecting ring and the static sealing ring together form the first cooling water cavity.

[0043] The other end of the second cooling water jacket is connected to the static sealing ring on the side away from the expansion joint, near the inner circumference, so that the second cooling water jacket and the static sealing ring together form a second cooling water cavity. The two cooling water cavities and the sealing cavity do not interfere with each other.

[0044] In the structural diagram provided in this embodiment, neither the first cooling water jacket nor the second cooling water jacket is connected to the outer circumference of the static sealing ring. Instead, they are connected to both sides of the splicing ring provided on the outer circumference of the static sealing ring. However, it is also feasible to connect the first cooling water jacket and the second cooling water jacket to the outer circumference of the static sealing ring.

[0045] In this embodiment, the first and second cooling water jackets are connected to both sides of the splicing ring on the outer circumference of the static sealing ring to facilitate the installation of the moving and stationary rings. In this embodiment, the static sealing ring is a split structure, composed of two L-shaped annular components joined together. Splicing rings 35 are radially connected to the outer circumference of each of the two annular components, and the two annular components are connected via these splicing rings. Specifically, the two splicing rings are fixed together with bolts. At this time, the condensate outlet needs to pass through the static sealing ring and the splicing ring to connect the sealing cavity to the outside. Alternatively, the first and second cooling water jackets can also be connected to the outer circumference of the static sealing ring near the splicing ring.

[0046] The top of the first and second cooling water jackets are respectively provided with cooling water inlets 65 connecting the outside to the first cooling water chamber and connecting the outside to the second cooling water chamber. The bottom of the first and second cooling water jackets are respectively provided with cooling water outlets 66 connecting the outside to the first cooling water chamber and connecting the outside to the second cooling water chamber. This realizes the circulation of cooling water in the first and second cooling water chambers, thereby cooling and condensing the oil vapor gas in the sealed cavity. The condensed oil vapor medium flows out through the condensation medium outlet and is collected by the condensation medium collection box.

[0047] Example 2

[0048] The oil-vapor multi-stage condensation sealing device provided in this embodiment is basically the same as the one in Embodiment 1, with two differences: First, in this embodiment, the outer circumference of the moving tooth ring and the stationary tooth ring is not fitted with sealing filler, but is sealed by contact through the sealing lip 8. Specifically, the stationary tooth ring is provided with a sealing lip with an X-shaped cross section at the end near the moving sealing ring, and the sealing lip contacts and seals with the moving tooth ring.

[0049] Another point is that the static sealing ring also covers the dynamic connecting ring. The inner circumference of the static sealing ring near both sides is provided with annular second grooves, each containing sealing packing material. This sealing packing material contacts and seals the tank outlet pipe, further improving the sealing effect. The partial structure of the oil-vapor multi-stage condensation sealing device provided in this embodiment is as follows: Figure 2 As shown.

[0050] Example 3

[0051] The oil-vapor sealing device provided in this embodiment is basically the same in structure as that in Embodiment 2, except that a third annular groove is provided on the inner circumference of the moving connecting ring, and heat insulation cotton 9 is embedded in the third groove. The heat insulation cotton contacts and seals with the outlet pipe of the tank. Figure 3 As shown.

[0052] Because the oil and gas medium has a complex composition and high temperature, the sealing fillers in examples 1, 2, and 3 are all high-temperature resistant and corrosion-resistant materials.

Claims

1. A multi-stage condensation sealing device for oil and vapor, installed at the rotatable connection between the tank outlet pipe and the oil and vapor conveying pipe, characterized in that: The oil-vapor multi-stage condensation sealing device includes: The expansion joint is ring-shaped, with one end tightly fitted onto the oil and gas transmission pipe. The moving ring includes a moving connecting ring, a moving sealing ring, and a moving toothed ring. The moving connecting ring is arranged axially and tightly fitted onto the tank outlet pipe. The moving sealing ring is arranged radially and connected to the middle of the outer circumference of the moving connecting ring. The moving toothed ring is arranged axially and two or more are symmetrically distributed on both sides of the moving sealing ring. The stationary ring includes a first stationary connecting ring, a second stationary connecting ring, a stationary sealing ring, and a stationary toothed ring. The first stationary connecting ring is arranged radially and connected to the end of the expansion joint away from the oil and gas conveying pipe. The second stationary connecting ring is arranged axially and connected to the inner circumference of the first stationary connecting ring. The first stationary connecting ring extends to the side away from the expansion joint and connects to the stationary sealing ring. The stationary sealing ring has a C-shaped cross section and covers the dynamic sealing ring and the dynamic toothed ring. The stationary toothed ring is arranged axially and two or more are symmetrically distributed on the two inner sides of the stationary sealing ring. The dynamic toothed ring and the stationary toothed ring are interlaced. The oil and gas conveying pipe, the expansion joint, the tank outlet pipe, the dynamic ring, and the stationary ring together form a sealing cavity. The bottom of the stationary sealing ring is provided with a condensate outlet that connects the sealing cavity to the outside. The first cooling water jacket and the second cooling water jacket are both annular in shape, with one end connected to the outer circumference of the static sealing ring on both sides of the condensate outlet. The other end of the first cooling water jacket is connected to the side of the static sealing ring near the expansion joint and close to the inner circumference, or to the outer circumference of the second static connecting ring, or to the side of the first static connecting ring away from the expansion joint, so that the first cooling water jacket and the static sealing ring, or the first cooling water jacket and the static sealing ring and the second static connecting ring, or the first cooling water jacket and the static sealing ring together form a first cooling water cavity. The other end of the second cooling water jacket is connected to the side of the static sealing ring away from the expansion joint and close to the inner circumference, so that the second cooling water jacket and the static sealing ring together form a second cooling water cavity.

2. The oil-vapor multi-stage condensation sealing device according to claim 1, characterized in that: The static sealing ring is a split structure, consisting of two L-shaped annular components spliced ​​together; each of the two annular components has a splicing ring connected radially on its outer circumference, and the two annular components are connected through the splicing ring. The condensate outlet passes through the static sealing ring and the splicing ring, thereby connecting the sealing cavity to the outside.

3. The oil-vapor multi-stage condensation sealing device according to claim 2, characterized in that: The first cooling water jacket is connected to the outer circumference of the second static connecting ring and the side of the splicing ring near the expansion joint. The second cooling water jacket is connected to the inner circumference of the static sealing ring away from the expansion joint and the side of the splicing ring away from the expansion joint.

4. The oil-vapor multi-stage condensation sealing device according to claim 1, characterized in that: The top of the first cooling water jacket and the second cooling water jacket are respectively provided with cooling water inlets that connect to the outside and the first cooling water cavity, and to the outside and the second cooling water cavity. The bottom of the first cooling water jacket and the second cooling water jacket are respectively provided with cooling water outlets that connect to the outside and the first cooling water cavity, and to the outside and the second cooling water cavity.

5. The oil-vapor multi-stage condensation sealing device according to claim 1, characterized in that: The outer circumference of the moving connecting ring, the moving toothed ring, and the stationary toothed ring are all distributed with annular first grooves. Annular sealing packing is embedded in each of the first grooves. The outer circumference of the sealing packing on the moving connecting ring and the moving toothed ring contacts and seals with the nearby stationary toothed ring or stationary sealing ring. The outer circumference of the sealing packing on the stationary toothed ring contacts and seals with the nearby moving toothed ring.

6. The oil-vapor multi-stage condensation sealing device according to claim 1, characterized in that: The stationary gear ring is provided with an X-shaped sealing lip on the end near the moving sealing ring, and the sealing lip contacts and seals with the moving gear ring.

7. The oil-vapor multi-stage condensation sealing device according to claim 1, characterized in that: The static sealing ring also covers the dynamic connecting ring. The inner circumference of the static sealing ring near both sides is provided with annular second grooves. Sealing filler is embedded in each of the second grooves, and the sealing filler contacts and seals with the outlet pipe of the tank.

8. The oil-vapor multi-stage condensation sealing device according to claim 1, characterized in that: The expansion joint includes a first connecting part, an n-shaped expansion section and a second connecting part connected in sequence. The first connecting part is arranged axially and tightly fixed on the oil and gas conveying pipe. The n-shaped expansion section is provided in more than one section. The second connecting part is arranged radially and fixedly connected to the first static connecting ring.

9. The oil-vapor multi-stage condensation sealing device according to claim 1, characterized in that: The inner circumference of the moving connecting ring is provided with an annular third groove, and heat insulation cotton is embedded in the third groove. The heat insulation cotton is in contact with and sealed to the outlet pipe of the tank.

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