Shaft head sealing device

Abstract

This utility model belongs to the technical field of turbine units and discloses a shaft end sealing device. The shaft end sealing device includes a sealing ring and an air pipe assembly. The sealing ring is disposed in the mounting housing and has a shaft hole for a rotating shaft to pass through. The inner circumferential surface of the sealing ring seals against the rotating shaft. A lubrication cavity is recessed on the inner circumferential surface of the sealing ring to hold lubricating oil. The sealing ring has an exhaust hole inside, and the air pipe assembly is connected to the sealing ring. The air pipe assembly has an exhaust channel inside, and the two ends of the exhaust hole are respectively connected to the exhaust channel and the lubrication cavity. This shaft end sealing device has a simple structure and is easy to use. It can promptly discharge high-pressure gas from the lubrication cavity and the mounting housing, thereby achieving pressure relief and passively preventing lubricating oil leakage. Alternatively, it can be connected to an external air pump to input gas, thereby generating a high-pressure gas seal membrane to achieve active leak prevention of lubricating oil.

Description

Technical Field

[0001] This utility model relates to the field of turbine unit technology, and in particular to a shaft head sealing device. Background Technology

[0002] A turbine unit, also known as a turbocharger, is a machine that converts the energy contained in a fluid working medium into mechanical work. Its core structure is a rotating shaft with blades. When the fluid flows through the nozzle, the pressure energy is converted into kinetic energy, which then impacts the blades to drive the rotating shaft to rotate at a high speed, thereby outputting mechanical work.

[0003] Due to the diverse actual operating conditions in industrial production, some turbines are in harsh conditions such as high temperature and high pressure. Under such conditions, the air pressure inside the turbine is greater than the external atmospheric pressure, which can easily damage the seal of the unit's shaft head and cause lubricating oil leakage.

[0004] Therefore, there is an urgent need to design an air-sealing structure to solve the above-mentioned problems in the existing technology. Utility Model Content

[0005] The purpose of this utility model is to provide a shaft head sealing device that is simple in structure, easy to install, and can effectively prevent lubricating oil leakage.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a shaft head sealing device, comprising:

[0008] A sealing ring is provided in the mounting housing. The sealing ring has a shaft hole for a rotating shaft (200) to pass through. The inner circumferential surface of the sealing ring is in sealing fit with the rotating shaft (200). A lubrication cavity is recessed on the inner circumferential surface of the sealing ring for containing lubricating oil.

[0009] The air tube assembly has an exhaust hole inside the sealing ring, the air tube assembly is connected to the sealing ring, the air tube assembly has an exhaust channel inside, and the two ends of the exhaust hole are respectively connected to the exhaust channel and the lubrication chamber.

[0010] Preferably, the tracheal assembly includes a first tube segment, a flexible joint, and a second tube segment. The first tube segment is detachably connected to the sealing ring, and the second tube segment is connected to the first tube segment via the flexible joint. The first tube segment is rotatable relative to the second tube segment.

[0011] Preferably, the outer wall surface of the first pipe section is provided with an external thread, and the sealing ring is provided with an internal thread that mates with the external thread.

[0012] Preferably, the exhaust channel is provided with a baffle and an elastic element, one end of the elastic element is connected to the inner wall of the exhaust channel, and the other end of the elastic element is connected to the baffle.

[0013] A baffle is provided on the inner wall of the exhaust channel, directly opposite the baffle ring. The baffle and the baffle are sealed together. The baffle can overcome the elastic force of the elastic element under the action of external force and move away from the baffle along the length direction of the exhaust channel.

[0014] Preferably, the shaft head sealing device further includes a cover plate, the cover plate including a connecting part and an oil-blocking part, the connecting part being connected to the sealing ring, the sealing ring having an oil return channel for returning the lubricating oil in the lubrication chamber to the interior of the mounting housing, and the oil-blocking part being positioned opposite the oil return chamber of the sealing ring.

[0015] Preferably, the end of the vent hole that communicates with the vent channel is the first end, and the end of the vent hole that communicates with the lubrication cavity is the second end. Along the height direction, the first end is higher than the second end.

[0016] Preferably, the vent extends vertically and connects to the end of the lubrication cavity opposite to the ground.

[0017] Preferably, multiple exhaust ports are provided, and multiple air pipe assemblies are also provided corresponding to each exhaust port.

[0018] The beneficial effects of this utility model are as follows:

[0019] The shaft sealing device provided by this utility model includes a sealing ring and an air pipe assembly. The sealing ring is installed on the mounting housing, and the rotating shaft passes through the shaft hole of the sealing ring, with the inner circumferential surface of the sealing ring sealingly engaging with the rotating shaft. Since a lubrication cavity is provided on the inner circumferential surface of the sealing ring to hold lubricating oil, the lubricating oil can lubricate the rotating shaft, thereby reducing the friction between the inner circumferential surface of the sealing ring and the rotating shaft, and reducing the rotational resistance of the rotating shaft. An air pipe assembly is connected to the sealing ring. Since the two ends of the exhaust hole are respectively connected to the exhaust channel of the air pipe assembly and the lubrication cavity, the exhaust channel is connected to the lubrication cavity through the exhaust hole, allowing the gas in the lubrication cavity to expand due to high temperature to pass through. The lubrication chamber and mounting housing are promptly vented through the vent and venting channels, preventing lubricating oil from being forced out of the lubrication chamber due to excessive internal air pressure. Simultaneously, since the venting channel connects to the lubrication chamber via the vent, the shaft end seal device can also input gas into the lubrication chamber via an external air pump to form a high-pressure gas seal, thereby preventing internal lubricating oil leakage. This shaft end seal device has a simple structure and is easy to use. It can promptly vent high-pressure gas from the lubrication chamber and mounting housing, thus achieving pressure relief for passive lubricating oil leakage prevention. It can also actively prevent lubricating oil leakage by inputting gas via an external air pump to generate a high-pressure gas seal. Attached Figure Description

[0020] Figure 1 This is an installation diagram of the shaft head sealing device provided in a specific embodiment of this utility model;

[0021] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0023] Figure 4 This is a cross-sectional view of the tracheal assembly provided in a specific embodiment of this utility model;

[0024] Figure 5 This is an assembly diagram of the cover plate and sealing ring provided in a specific embodiment of this utility model.

[0025] In the picture:

[0026] 100 - Mounting enclosure;

[0027] 200 - Rotating shaft;

[0028] 1—Sealing ring; 11—Shaft hole; 12—Lubrication cavity; 13—Exhaust hole; 14—Oil return channel;

[0029] 2-Tracheal tube assembly; 21-Exhaust passage; 22-First tube segment; 23-Flexible connector; 24-Second tube segment;

[0030] 3-Cover plate; 31-Connecting part; 32-Oil baffle. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] like Figures 1 to 4As shown, this utility model provides a shaft head sealing device, which includes a sealing ring 1 and an air pipe assembly 2. The sealing ring 1 is disposed in the mounting housing 100 and has a shaft hole 11 for passing through a rotating shaft 200. The inner circumferential surface of the sealing ring 1 is in sealing fit with the rotating shaft 200. A lubrication cavity 12 is recessed on the inner circumferential surface of the sealing ring 1 for containing lubricating oil. The sealing ring 1 has an exhaust hole 13 inside. The air pipe assembly 2 is connected to the sealing ring 1 and has an exhaust channel 21 inside. The two ends of the exhaust hole 13 are respectively connected to the exhaust channel 21 and the lubrication cavity 12.

[0036] In this embodiment, since a lubrication cavity 12 is provided on the inner circumferential surface of the sealing ring 1, the lubrication cavity 12 is used to contain lubricating oil. Therefore, the lubricating oil can lubricate the rotating shaft 200, thereby reducing the friction between the inner circumferential surface of the sealing ring 1 and the rotating shaft 200 and reducing the rotational resistance of the rotating shaft 200. An air pipe assembly 2 is connected to the sealing ring 1. Since the two ends of the exhaust hole 13 are respectively connected to the exhaust channel 21 of the air pipe assembly 2 and the lubrication cavity 12, the exhaust channel 21 is connected to the lubrication cavity 12 through the exhaust hole 13. The gas in the lubrication cavity 12 that expands due to high temperature can be discharged from the lubrication cavity 12 and the mounting box 10 in a timely manner through the exhaust hole 13 and the exhaust channel 21. The shaft head sealing device is designed to prevent the lubricating oil from being forced out of the lubrication chamber 12 due to excessive air pressure inside the mounting housing 100. Simultaneously, since the exhaust channel 21 is connected to the lubrication chamber 12 via the exhaust hole 13, the shaft head sealing device can also input gas into the lubrication chamber 12 via an external air pump to form a high-pressure air seal film, thereby preventing internal lubricating oil leakage. This shaft head sealing device has a simple structure and is easy to use. It can promptly discharge the high-pressure gas inside the lubrication chamber 12 and the mounting housing 100, thereby completing pressure relief to achieve passive anti-leakage of the lubricating oil. It can also input gas via an external air pump to generate a high-pressure air seal film to achieve active anti-leakage of the lubricating oil.

[0037] Specifically, this shaft end sealing device is mostly used in turbine units and is installed at the end of the rotating shaft 200 that extends out of the mounting housing 100. It is used to support and fix the rotating shaft 200, and at the same time, it can lubricate the rotating shaft 200. This shaft end sealing device has two working conditions. The first is a passive leak-proof working condition, in which the lubrication chamber 12 is connected to the external environment through the exhaust channel 21, so the gas in the lubrication chamber 12 and the mounting housing 100 can be discharged through the exhaust channel 21. The second is an active leak-proof working condition, in which the air pipe assembly 2 is connected to an external air pump. The air pump delivers nitrogen gas to the lubrication chamber 12 through the exhaust channel 21 and the exhaust hole 13, thereby forming a high-pressure gas film to prevent lubricating oil from leaking outward.

[0038] like Figure 3As shown, the tracheal assembly 2 includes a first pipe section 22, a flexible connector 23, and a second pipe section 24. The first pipe section 22 is detachably connected to the sealing ring 1, and the second pipe section 24 is connected to the first pipe section 22 via the flexible connector 23. The first pipe section 22 can rotate relative to the second pipe section 24, thereby greatly improving the flexibility of the tracheal assembly 2. Specifically, both the first pipe section 22 and the second pipe section 24 are straight pipe sections, connected by the flexible connector 23. Operators can twist the second pipe section 24 to change the relative position of the second pipe section 24 and the first pipe section 22, making it easier for the tracheal assembly 2 to connect to an external air pump, thus greatly improving the practicality of the shaft sealing device. In this embodiment, the flexible connector 23 is made of rubber. It can be understood that the internal channels of the first pipe section 22, the flexible connector 23, and the second pipe section 24 together form the exhaust channel 21.

[0039] The connection method between the tracheal assembly 2 and the sealing ring 1 can be set according to the actual situation. For example, the outer wall surface of the first tube segment 22 is provided with an external thread, and the sealing ring 1 is provided with an internal thread that mates with the external thread. The first tube segment 22 and the sealing ring 1 are threadedly connected. The connection and disassembly of the tracheal assembly 2 and the sealing ring 1 can be achieved by screwing, which is simple to operate.

[0040] In order to effectively protect the lubrication chamber 12, a baffle and an elastic element are provided in the exhaust channel 21. One end of the elastic element is connected to the inner wall of the exhaust channel 21, and the other end of the elastic element is connected to the baffle. A partition is provided on the inner wall of the exhaust channel 21 opposite to the baffle. The baffle and the partition are sealed together. The baffle can overcome the elastic force of the elastic element under the action of external force and move away from the partition along the length of the exhaust channel 21. In this embodiment, the inner diameter of the exhaust channel 21 is the same at any position. At a certain position, an annular baffle is provided on the inner wall of the exhaust channel 21. When the baffle is only subjected to the elastic force of the elastic element, the baffle aligns with the surrounding baffle, and the two are sealed together to isolate the exhaust channel 21. At this time, the exhaust channel 21 is closed to prevent foreign objects from entering the lubrication chamber 12 through the air pipe assembly 2 and causing wear on the rotating shaft 200. When the gas pressure in the lubrication chamber 12 increases or an external air pump delivers gas to the lubrication chamber 12, the gas pressure will exert pressure on the baffle. This pressure is much greater than the elastic force of the elastic element, so the baffle will move along the axial direction of the baffle, thereby restoring the isolation of the exhaust channel 21 to open, so that the gas can pass through smoothly.

[0041] To further prevent lubricant leakage, such as Figure 1 and Figure 5As shown, the shaft head sealing device also includes a cover plate 3, which includes a connecting part 31 and an oil-blocking part 32. The connecting part 31 is connected to the sealing ring 1, and the sealing ring 1 has an oil return channel 14. The oil return channel 14 is used to return the lubricating oil in the lubrication chamber 12 to the interior of the mounting housing 100. The oil-blocking part 32 is arranged directly opposite the oil return chamber of the sealing ring 1. Specifically, the high-speed rotating shaft 200 will generate turbulent airflow on the outside. This turbulent airflow will have an adsorption effect on the lubricating oil in the oil return channel 14. The oil-blocking part 32 is arranged horizontally opposite the oil return channel 14, thereby effectively reducing the adsorption effect of the turbulent airflow on the lubricating oil.

[0042] In this embodiment, the connecting part 31 is a ring-shaped structure and is connected to the sealing ring 1 by bolts. The oil blocking part 32 is integrally formed with the connecting part 31. The shape of the oil blocking part 32 can be circular, rectangular, etc., as long as it can block the oil return channel 14. Its shape is not limited here.

[0043] The end of the vent hole 13 that connects to the vent channel 21 is the first end, and the end of the vent hole 13 that connects to the lubrication chamber 12 is the second end. Along the height direction, the first end is higher than the second end, thus effectively preventing lubricating oil from flowing out along the vent hole 13 under the action of gravity. Specifically, the lubrication chamber 12 is arranged in a ring around the inner circumference of the sealing ring 1, and multiple vent holes 13 are provided along the circumference of the sealing ring 1. The air pipe assembly 2 is also provided with multiple vent holes 13 corresponding to each other.

[0044] In another embodiment, such as Figure 1 As shown, the vent 13 extends vertically and connects to the end of the lubrication chamber 12 that is away from the ground. Specifically, the lubrication chamber 12 is arranged in a circle around the inner circumference of the sealing ring 1, and there is one vent 13. The vent 13 extends vertically to the lubrication chamber 12 and connects to the highest point of the lubrication chamber 12 that is away from the ground. This ensures that the internal gas can be discharged smoothly while preventing the lubricating oil from flowing out along the vent 13.

[0045] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A shaft head sealing arrangement, characterised in that, include: A sealing ring (1) is provided in the mounting housing (100). The sealing ring (1) has a shaft hole (11) for passing through a rotating shaft (200). The inner circumferential surface of the sealing ring (1) is sealed to the rotating shaft (200). A lubrication cavity (12) is recessed on the inner circumferential surface of the sealing ring (1) for containing lubricating oil. The air tube assembly (2) has an exhaust hole (13) inside the sealing ring (1), the air tube assembly (2) is connected to the sealing ring (1), the air tube assembly (2) has an exhaust channel (21) inside, and the two ends of the exhaust hole (13) are respectively connected to the exhaust channel (21) and the lubrication chamber (12).

2. The shaft seal apparatus of claim 1, wherein The tracheal assembly (2) includes a first tube segment (22), a flexible connector (23), and a second tube segment (24). The first tube segment (22) is detachably connected to the sealing ring (1), and the second tube segment (24) is connected to the first tube segment (22) through the flexible connector (23). The first tube segment (22) is rotatable relative to the second tube segment (24).

3. A shaft head sealing arrangement according to claim 2, wherein, The outer wall surface of the first pipe section (22) is provided with an external thread, and the sealing ring (1) is provided with an internal thread that mates with the external thread.

4. The shaft seal apparatus of claim 1, wherein The exhaust channel (21) is provided with a baffle and an elastic element. One end of the elastic element is connected to the inner wall of the exhaust channel (21), and the other end of the elastic element is connected to the baffle. A baffle is provided on the inner wall of the exhaust channel (21) opposite to the baffle ring. The baffle and the baffle are sealed together. The baffle can overcome the elastic force of the elastic element under the action of external force and move away from the baffle along the length direction of the exhaust channel (21).

5. The shaft seal apparatus of claim 1, wherein The shaft head sealing device also includes a cover plate (3), which includes a connecting part (31) and an oil-blocking part (32). The connecting part (31) is connected to the sealing ring (1). The sealing ring (1) has an oil return channel (14) for returning the lubricating oil in the lubrication chamber (12) to the interior of the mounting housing (100). The oil-blocking part (32) is positioned opposite the oil return chamber of the sealing ring (1).

6. A shaft seal arrangement according to any one of claims 1-5, characterised in that The end of the exhaust hole (13) that is connected to the exhaust channel (21) is the first end, and the end of the exhaust hole (13) that is connected to the lubrication cavity (12) is the second end. Along the height direction, the first end is higher than the second end.

7. A shaft head sealing arrangement according to claim 6, wherein The vent (13) extends vertically and connects to the end of the lubrication cavity (12) facing away from the ground.

8. The shaft seal apparatus of claim 6, wherein, The exhaust port (13) is provided in multiple ways, and the air pipe assembly (2) is also provided in multiple ways corresponding to the exhaust port (13).

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