A rotary device discharge pipe sealing device

Abstract

The utility model provides a kind of rotary equipment discharge pipe sealing device, moving ring includes the dynamic connection ring and dynamic sealing ring connected as a whole, dynamic connection ring is fixedly sleeved on discharge pipe;Static ring includes static connection ring, first static sealing ring and second static sealing ring, static connection ring is fixedly sleeved on the discharge pipe, the recess of first static sealing ring and second static sealing ring is covered on the cross structure of dynamic sealing ring, forms four overall annular cavities, four cavities are all tightly filled with sealing packing, first static sealing ring and second static sealing ring are connected and fixed by connecting piece, so that first static sealing ring and second static sealing ring will sealing packing be pressed on dynamic sealing ring. Contact sealing is carried out to discharge pipe and discharge pipe by four-corner distribution sealing packing, sealing effect is good, structure is simple, convenient to assemble and disassemble, service life is long, and axial movement resistance and radial deflection resistance effect are good.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically to a sealing device for the discharge pipe of a rotating equipment. Background Technology

[0002] When a medium (gas, liquid, dust, etc.) is discharged from a rotating equipment, it flows out through a discharge pipe connected to the rotating equipment and then through a feed pipe connected to the discharge pipe to the next stage of process equipment. Since the discharge pipe rotates with the rotating equipment, while the feed pipe is fixed, the connection between the two pipes is a rotating connection. Gaps inevitably appear at this connection, causing the medium to overflow, resulting in waste, environmental pollution, and potentially affecting the internal pressure of the rotating equipment. Therefore, it is essential to seal the gap at the rotating connection between the discharge and feed pipes.

[0003] However, rotating equipment may experience issues such as movement and misalignment during operation, causing the sealing device to move axially and radially, affecting its sealing performance and service life. Furthermore, for some high-temperature media, to prevent leakage (especially gaseous media) from the connection between the discharge and feed pipes, which could cause safety problems, the sealing device typically requires water cooling. This cools the leaked high-temperature media and also lowers the overall temperature of the sealing device, reducing its aging and wear.

[0004] Chinese patent CN115560150A discloses a multi-stage condensation sealing device for oil and vapor. This sealing device seals the rotating connection between the tank outlet pipe and the oil and vapor delivery pipe through expansion joints, a moving ring, and a stationary ring. It offers good sealing performance, long service life, and can adapt to radial and axial movement of the tank outlet pipe. The sealing device also includes a cooling water chamber to condense the oil and vapor medium, preventing leakage and potential hazards. However, this sealing device has the following problems: Mechanical seals typically employ labyrinth seals and contact seals. While labyrinth seals usually meet sealing requirements, for applications with high sealing requirements, contact seals are often necessary to ensure zero leakage of the sealing medium. Therefore, this sealing device, while incorporating a labyrinth seal between the moving and stationary rings, also uses sealing packing on the outer circumference of the moving connecting ring, the moving toothed ring, and the stationary toothed ring for contact sealing. The reliability of the seal is ensured through the combined use of labyrinth and contact seals. However, the sealing packing in the labyrinth seal cavity only makes contact and seal in the axial direction. If the tank outlet pipe experiences axial movement, the reliability of the seal can still be guaranteed. But if radial misalignment occurs, gaps appear between the sealing packing and its contact surface, causing the sealing medium entering the labyrinth seal cavity to gradually leak outward from the gaps, affecting its sealing effect. At the same time, in order to avoid the sealing failure caused by radial misalignment, the sealing device needs to be equipped with multiple moving and stationary toothed rings to form a more convoluted labyrinth seal cavity, and multiple sealing packings are also required for multiple contact seals. This results in a complex sealing device structure and time-consuming and labor-intensive installation. Summary of the Invention

[0005] To address the aforementioned shortcomings in the existing technology, this utility model provides a sealing device for the discharge pipe of a rotating equipment. The device uses sealing packings distributed at the four corners to seal the discharge pipe and the feed pipe, resulting in a good sealing effect, simple structure, convenient installation and removal, long service life, and good resistance to axial movement and radial sway.

[0006] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows: A sealing device for the discharge pipe of a rotating equipment, wherein the discharge pipe is connected to the rotating equipment and rotates synchronously with the rotating equipment, and a feed pipe is rotatably connected inside the discharge pipe. The medium inside the rotating equipment enters the feed pipe through the discharge pipe. The sealing device is connected between the discharge pipe and the feed pipe to seal the gap between them. The sealing device for the discharge pipe of the rotating equipment includes: The moving ring includes a moving connecting ring and a moving sealing ring connected as one piece. The moving connecting ring is fixedly sleeved on the discharge pipe and rotates together with the discharge pipe. The cross-section of the moving sealing ring is "+" shaped, and the moving sealing ring is connected to the middle of the outer circumference of the moving connecting ring. The stationary ring comprises a stationary connecting ring, a first stationary sealing ring, and a second stationary sealing ring connected in sequence. The stationary connecting ring is fixedly sleeved on the feed pipe. The first and second stationary sealing rings are loosely sleeved on the moving connecting ring and located on opposite sides of the moving sealing ring, respectively. Both the first and second stationary sealing rings have annular grooves on their end faces near the moving sealing ring. These grooves cover the "+" shaped structure of the moving sealing ring, forming four annular cavities. Each of the four cavities is tightly filled with sealing packing, ensuring a tight seal. The outer surface of the sealing packing is in contact with the dynamic sealing ring and the first static sealing ring or the second static sealing ring. The first static sealing ring and the second static sealing ring are connected and fixed by a connector, which includes a screw and a connecting plate fixedly connected to the outer surface of the first static sealing ring and the second static sealing ring. The screw passes through the connecting plate of the first static sealing ring and the second static sealing ring axially. Nuts are connected to both ends of the screw. The first static sealing ring and the second static sealing ring are pressed by the nuts, so that the first static sealing ring and the second static sealing ring press the sealing packing onto the dynamic sealing ring.

[0007] A compression spring is fitted at one end of the screw, and a nut at that end presses and locks the compression spring onto the connecting plate, thereby providing preload.

[0008] A first telescopic sleeve is fixedly connected between the first static sealing ring and the second static sealing ring, and the first telescopic sleeve is loosely fitted on the dynamic sealing ring.

[0009] The first telescopic sleeve has an arc-shaped cross-section and is made of elastic rubber.

[0010] A second telescopic sleeve is fixedly connected between the static connecting ring and the first static sealing ring.

[0011] The second telescopic sleeve has an arc-shaped cross-section and is made of elastic rubber.

[0012] The first static sealing ring has an L-shaped cross section, including an axially arranged annular connecting part and a longitudinally arranged annular sealing part that are connected as one piece. The groove is located on the end face of the annular sealing part, and the second telescopic sleeve is fixedly sleeved on the outer circle surface of the annular connecting part.

[0013] The connecting plates of the first static sealing ring and the second static sealing ring are both annular in shape, and multiple screws are distributed and interspersed on the two connecting plates. Each screw is equipped with a nut for locking.

[0014] The stationary ring and the moving ring are covered with an integrally ring-shaped cooling sleeve. One end of the cooling sleeve is fixedly fitted onto the stationary connecting ring, and the other end of the cooling sleeve is loosely fitted onto the moving connecting ring. A labyrinth seal is provided between the other end of the cooling sleeve and the moving connecting ring to seal the cooling sleeve and the moving connecting ring. A water inlet is provided at the top of the cooling sleeve, and a water outlet is provided at the bottom of the cooling sleeve.

[0015] The end face of the moving connecting ring near the discharge pipe and the end face of the stationary connecting ring near the feed pipe are both integrally connected with connecting flanges. The moving connecting ring is fixedly connected to the discharge pipe through the connecting flanges, and the stationary connecting ring is fixedly connected to the feed pipe through the connecting flanges.

[0016] Compared with the prior art, the rotary equipment discharge pipe sealing device provided by this utility model has the following advantages: 1. In this utility model, axial and radial contact sealing is achieved by tightly filling the cavity formed by the dynamic sealing ring and the static sealing ring with sealing packing. The sealing effect is good and the sealing structure is simple and easy to install and remove. At the same time, the cavity (labyrinth sealing cavity) between the dynamic sealing ring and the static sealing ring is completely filled, so that the dynamic ring can provide support for the static ring, ensuring the stability of the entire sealing structure.

[0017] 2. In this utility model, a pre-tightening force is applied to the first static sealing ring and the second static sealing ring by a compression spring. Even if the sealing packing is worn, the reliability of the seal can be ensured, and the service life of the sealing device is improved. At the same time, the first telescopic sleeve is connected between the first static sealing ring and the second static sealing ring, which can ensure the sealing performance at the connection between the first static sealing ring and the second static sealing ring, and can allow the static sealing ring to move under the action of the compression spring pre-tightening force.

[0018] 3. In this utility model, a second telescopic sleeve is fixedly connected between the static connecting ring and the first static sealing ring. When the discharge pipe drives the moving ring to move axially, the moving ring drives the first telescopic sleeve to extend and retract, thereby preventing gaps from appearing on the axial contact surface of the sealing packing and affecting the sealing effect. At the same time, the moving sealing ring, the first static sealing ring, and the second static sealing ring form a grid-like structure. The sealing packing is located in the four cavities inside the grid-like structure, and its outer circular surface is in close contact with the moving and static sealing rings. When the moving ring wobbles radially with the discharge pipe, the static sealing ring can always press the sealing packing tightly, avoiding the problem of sealing failure during radial wobbling.

[0019] 4. In this utility model, the cooling jacket plays a role in water cooling, which can cool the sealing device under high temperature conditions, and at the same time prevent the high temperature medium from leaking out directly and causing safety problems when the seal fails. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall structure of the rotary equipment discharge pipe sealing device provided by this utility model; In the diagram: 1-Dynamic connecting ring, 2-Dynamic sealing ring, 3-Connecting flange, 4-Static connecting ring, 5-First static sealing ring, 501-Annular connecting part, 502-Annular sealing part, 6-Second static sealing ring, 7-Sealing packing, 8-Connecting plate, 9-Screw, 10-Nut, 11-Compression spring, 12-First telescopic sleeve, 13-Second telescopic sleeve, 14-Cooling sleeve, 15-Water inlet, 16-Water outlet, 17-Labyrinth seal. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] The structure of the rotary equipment discharge pipe sealing device provided in this embodiment is as follows: Figure 1 As shown in the figure (the rotating device, discharge pipe, and feed pipe are not shown), the discharge pipe is connected to the rotating device and rotates synchronously with the rotating device. The feed pipe is rotatably connected inside the discharge pipe. The medium inside the rotating device enters the feed pipe through the discharge pipe. The sealing device is connected between the discharge pipe and the feed pipe to seal the gap between the discharge pipe and the feed pipe.

[0023] The rotary equipment discharge pipe sealing device provided in this embodiment includes a rotating ring and a stationary ring. The rotating ring includes a rotating connecting ring 1 and a rotating sealing ring 2 connected as one piece. The rotating connecting ring is fixedly sleeved on the discharge pipe and rotates with the discharge pipe. The rotating sealing ring has a cross-section in the shape of a cross and is connected to the middle of the outer circumference of the rotating connecting ring. Specifically, a connecting flange 3 is integrally connected to the end face of the rotating connecting ring near the discharge pipe. The rotating connecting ring is bolted to the connecting flange of the discharge pipe through the connecting flange. During on-site installation, the rotating connecting ring can also be fixedly sleeved on the discharge pipe by an interference fit.

[0024] The stationary ring includes a stationary connecting ring 4, a first stationary sealing ring 5, and a second stationary sealing ring 6 connected in sequence. The stationary connecting ring is fixedly sleeved on the feed pipe. Specifically, a connecting flange is integrally connected to the end face of the stationary connecting ring near the feed pipe, and the stationary connecting ring is bolted to the connecting flange of the feed pipe through the connecting flange. During on-site installation, the stationary connecting ring can also be fixedly sleeved on the feed pipe using an interference fit. The first and second stationary sealing rings are both loosely sleeved on the moving connecting ring and are located on both sides of the moving sealing ring, respectively. The end faces of the first and second stationary sealing rings near the moving sealing ring are provided with an integrally annular groove. The grooves of the first and second stationary sealing rings cover the "+" shaped structure of the moving sealing ring, thereby forming four integrally annular cavities. Each of the four cavities is tightly filled with sealing packing 7, so that the outer circular surface of the sealing packing is in contact with the moving sealing ring and the first or second stationary sealing ring. At this time, a grid-like structure is formed between the dynamic sealing ring, the first static sealing ring, and the second static sealing ring. The sealing packing is located in the four cavities inside the grid-like structure. When the dynamic ring deflects radially with the discharge pipe, the static sealing ring always presses the sealing packing tightly (for example, when the dynamic ring deflects away from the axis, the sealing packing at the top of the dynamic sealing ring is squeezed, and a good seal can still be achieved), thus avoiding the problem of seal failure when deflecting radially.

[0025] In this embodiment, the first and second static sealing rings are connected and fixed by a connector, which includes a screw 9 and a connecting plate 8 fixedly connected to the outer circumference of the first and second static sealing rings. The screw 9 is axially inserted into the connecting plate of the first and second static sealing rings, and nuts 10 are connected to both ends of the screw 9. The nuts press the connecting plate on the first and second static sealing rings together, thereby pressing the first and second static sealing rings together. This allows the first and second static sealing rings to press the sealing packing onto the dynamic sealing ring. The pressed sealing packing also provides support for the first and second static sealing rings. The sealing packing contacts and seals the dynamic sealing ring and the first or second static sealing ring in both the axial and radial directions, resulting in a good sealing effect. Specifically, the connecting plate of the first and second static sealing rings is generally annular, with multiple screws inserted into the two connecting plates. Each screw is equipped with a nut for locking. In actual setup, the connecting plates can also be arc-shaped, with multiple plates distributed along the outer circular surface of the first and second static sealing rings. Each connecting plate is then locked in place by screws and nuts.

[0026] In this embodiment, a compression spring 11 is fitted onto one end of the screw (the compression spring is located at the end near the first static sealing ring in the figure). The nut at this end presses and locks the compression spring onto the connecting plate, thereby providing preload. Even if the sealing packing wears during long-term use, the first static sealing ring and the second sealing ring can still compress the sealing packing. The distance the compression spring is pressed (i.e., the magnitude of the preload) can be adjusted according to the actual situation. In this embodiment, a first telescopic sleeve 12 is fixedly connected between the first static sealing ring and the second static sealing ring, and the first telescopic sleeve is loosely fitted onto the dynamic sealing ring. The first telescopic sleeve ensures the sealing at the connection between the first static sealing ring and the second static sealing ring. At the same time, the telescopic characteristic of the first telescopic sleeve allows it to adapt to the situation where the first static sealing ring or the second static sealing ring (when the compression spring is located at the end near the second static sealing ring) moves under the action of the compression spring preload after the packing wears. Specifically, the cross-section of the first telescopic sleeve is arc-shaped, and the first telescopic sleeve is made of elastic rubber. In this embodiment, the two ends of the first telescopic sleeve are respectively fixedly fitted onto the outer circular surfaces of the first and second static sealing rings. In this case, the connecting plate is directly fixed to both ends of the first telescopic sleeve, that is, the connecting plate is fixed together with the first and second static sealing rings through the fixing sleeve. In actual installation, space can also be reserved on the outer circular surfaces of the first and second static sealing rings for the connecting plate, that is... Figure 1 The length of the second telescopic sleeve is shortened, or the thickness of the first and second static sealing rings is increased, so that the connecting plate is directly fixed to the outer surface of the first and second static sealing rings.

[0027] In this embodiment, a second telescopic sleeve 13 is fixedly connected between the stationary connecting ring and the first stationary sealing ring. Specifically, both ends of the second telescopic sleeve are fixedly fitted onto the outer circular surfaces of the stationary connecting ring and the first stationary sealing ring, respectively. Further, the first stationary sealing ring has an L-shaped cross-section, including an axially arranged annular connecting portion 501 and a longitudinally arranged annular sealing portion 502, which are connected as a single unit. A groove is located on the end face of the annular sealing portion, and the second telescopic sleeve is fixedly fitted onto the outer circular surface of the annular connecting portion. When the discharge pipe drives the moving ring to move axially, the moving ring drives the first telescopic sleeve to extend and retract, thereby preventing gaps from appearing on the axial contact surface of the sealing packing and affecting the sealing effect. Preferably, the second telescopic sleeve has an arc-shaped cross-section and is made of elastic rubber.

[0028] In this embodiment, a ring-shaped cooling sleeve 14 covers both the stationary and moving rings. One end of the cooling sleeve is fixedly fitted onto the stationary connecting ring, while the other end is loosely fitted onto the moving connecting ring. A labyrinth seal 17 is provided between the other end of the cooling sleeve and the moving connecting ring to seal the cooling sleeve and the moving connecting ring, thereby forming a cooling chamber around the entire sealing device. A water inlet 15 is provided at the top of the cooling sleeve, and a water outlet 16 is provided at the bottom of the cooling sleeve. Condensate enters the cooling sleeve from the water inlet and flows out from the water outlet, achieving a water cooling effect. Under high temperature conditions, this can cool the sealing device and prevent the high-temperature medium from leaking out directly and causing safety problems when the seal fails.

Claims

1. A sealing device for the discharge pipe of a rotating device, wherein the discharge pipe is connected to and rotates synchronously with the rotating device, a feed pipe is rotatably connected inside the discharge pipe, and the medium inside the rotating device enters the feed pipe through the discharge pipe; the sealing device is connected between the discharge pipe and the feed pipe to seal the gap between the discharge pipe and the feed pipe, characterized in that: The sealing device for the discharge pipe of the rotating equipment includes: The moving ring includes a moving connecting ring and a moving sealing ring connected as one piece. The moving connecting ring is fixedly sleeved on the discharge pipe and rotates together with the discharge pipe. The cross-section of the moving sealing ring is "+" shaped, and the moving sealing ring is connected to the middle of the outer circumference of the moving connecting ring. The stationary ring comprises a stationary connecting ring, a first stationary sealing ring, and a second stationary sealing ring connected in sequence. The stationary connecting ring is fixedly sleeved on the feed pipe. The first and second stationary sealing rings are loosely sleeved on the moving connecting ring and located on opposite sides of the moving sealing ring, respectively. Each of the first and second stationary sealing rings has an integrally annular groove on its end face near the moving sealing ring. The grooves of the first and second stationary sealing rings cover the "+" shaped structure of the moving sealing ring, thus forming four integrally annular cavities. Each of the four cavities is tightly filled with sealing packing, ensuring a tight seal. The outer surface of the sealing packing is in contact with the dynamic sealing ring and the first static sealing ring or the second static sealing ring. The first static sealing ring and the second static sealing ring are connected and fixed by a connector, which includes a screw and a connecting plate fixedly connected to the outer surface of the first static sealing ring and the second static sealing ring. The screw passes through the connecting plate of the first static sealing ring and the second static sealing ring axially. Nuts are connected to both ends of the screw. The first static sealing ring and the second static sealing ring are pressed by the nuts, so that the first static sealing ring and the second static sealing ring press the sealing packing onto the dynamic sealing ring.

2. The sealing device for the discharge pipe of a rotating equipment according to claim 1, characterized in that: A compression spring is fitted at one end of the screw, and a nut at that end presses and locks the compression spring onto the connecting plate, thereby providing preload.

3. The sealing device for the discharge pipe of a rotating equipment according to claim 2, characterized in that: A first telescopic sleeve is fixedly connected between the first static sealing ring and the second static sealing ring, and the first telescopic sleeve is loosely fitted on the dynamic sealing ring.

4. The sealing device for the discharge pipe of a rotating equipment according to claim 3, characterized in that: The first telescopic sleeve has an arc-shaped cross-section and is made of elastic rubber.

5. The sealing device for the discharge pipe of a rotating equipment according to claim 1, characterized in that: A second telescopic sleeve is fixedly connected between the static connecting ring and the first static sealing ring.

6. The sealing device for the discharge pipe of a rotating equipment according to claim 5, characterized in that: The second telescopic sleeve has an arc-shaped cross-section and is made of elastic rubber.

7. The sealing device for the discharge pipe of a rotating equipment according to claim 5, characterized in that: The first static sealing ring has an L-shaped cross section, including an axially arranged annular connecting part and a longitudinally arranged annular sealing part that are connected as one piece. The groove is located on the end face of the annular sealing part, and the second telescopic sleeve is fixedly sleeved on the outer circle surface of the annular connecting part.

8. The sealing device for the discharge pipe of a rotating equipment according to claim 1, characterized in that: The connecting plates of the first static sealing ring and the second static sealing ring are both annular in shape, and multiple screws are distributed and interspersed on the two connecting plates. Each screw is equipped with a nut for locking.

9. The sealing device for the discharge pipe of a rotating equipment according to claim 1, characterized in that: The stationary ring and the moving ring are covered with an integrally ring-shaped cooling sleeve. One end of the cooling sleeve is fixedly fitted onto the stationary connecting ring, and the other end of the cooling sleeve is loosely fitted onto the moving connecting ring. A labyrinth seal is provided between the other end of the cooling sleeve and the moving connecting ring to seal the cooling sleeve and the moving connecting ring. A water inlet is provided at the top of the cooling sleeve, and a water outlet is provided at the bottom of the cooling sleeve.

10. The sealing device for the discharge pipe of a rotating equipment according to claim 1, characterized in that: The end face of the moving connecting ring near the discharge pipe and the end face of the stationary connecting ring near the feed pipe are both integrally connected with connecting flanges. The moving connecting ring is fixedly connected to the discharge pipe through the connecting flanges, and the stationary connecting ring is fixedly connected to the feed pipe through the connecting flanges.

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