External integrated sealing mechanism

Abstract

The utility model provides an externally-mounted integrated sealing mechanism which comprises a radial connecting ring, a sealing ring and a sealing ring. The axial connecting ring is connected to the inner circular surface of the radial connecting ring, and the axial connecting ring and the radial connecting ring jointly form a structure with an L-shaped section; the sealing ring is connected to the inner circle face of the axial connecting ring, a main sealing lip is arranged at the end of the sealing ring, and the main sealing lip is hooped on the outer circle face of the rotating shaft through a hooping spring; the radial connecting ring, the axial connecting ring, the sealing ring and the main sealing lip are fixedly connected into an integrated structure. According to the sealing mechanism, the rotating shaft is in contact sealing through the sealing lips on the single-stage or multi-stage sealing ring, the sealing effect is good, meanwhile, the whole sealing mechanism is of a cantilever type structure, the following performance and the fitting performance between the sealing lips and the rotating shaft are guaranteed, the sealing mechanism adapts to roundness run-out and running run-out of the rotating shaft, and the whole sealing mechanism is integrated and convenient to install.

Description

Technical Field

[0001] The utility model provides a device for sealing a rotating shaft, in particular an externally mounted integrated sealing mechanism, belonging to the technical field of mechanical seals. Background Art

[0002] A mechanical seal is a device for preventing fluid leakage in equipment. Contact seals and labyrinth seals are two main forms of mechanical seals. Among them, a labyrinth seal is provided with a plurality of sequentially arranged annular sealing teeth around a rotating shaft, and a series of throttling gaps and expansion cavities are formed between the teeth. The medium to be sealed generates a throttling effect when passing through the tortuous labyrinth gaps to achieve the purpose of leakage prevention. Since there is a gap between the rotor and the casing of the labyrinth seal, there is no solid contact and thermal expansion is allowed, so it is suitable for occasions with high temperature, high pressure, and high rotational speed frequency. This sealing form is widely used for the shaft ends and seals between stages of steam turbines, gas turbines, compressors, and blowers. However, for some occasions with high sealing performance requirements, contact seals are usually used to seal the rotating shaft. In contact seals, the leakage rate of the medium to be sealed is very low, ensuring zero leakage of the fluid in the sealed cavity, and also achieving the purpose of preventing external pollutants from entering the sealed cavity.

[0003] In addition to having high requirements for sealing performance, there are also high requirements for the service life of the sealing device. At present, there are many various sealing device products in this field, with complex or simple structures, and different sealing performances and service lives. Generally speaking, it is still the common aspiration of those skilled in the art to provide a sealing device with good sealing performance, simple structure, and long service life. Summary of the Invention

[0004] The utility model provides an externally mounted integrated sealing mechanism. The sealing mechanism performs contact sealing on the rotating shaft through the sealing lips on a single-stage or multi-stage sealing ring, with good sealing effect. At the same time, the entire sealing mechanism is in a cantilever structure, ensuring the followability and fit between the sealing lip and the rotating shaft, adapting to the roundness runout and operating runout of the rotating shaft, and the entire sealing mechanism is integrated, making the installation convenient.

[0005] The technical solution adopted to achieve the above object of the utility model is as follows:

[0006] An externally mounted integrated sealing mechanism is installed between a rotating shaft and a bearing end cover. The rotating shaft is installed in the bearing end cover and extends out from the bearing end cover. The gap between the inside of the bearing end cover and the rotating shaft is a sealed cavity. The externally mounted integrated sealing mechanism includes:

[0007] A radial connection ring, which is fixedly attached to the side wall of the bearing end cover;

[0008] An axial connection ring, which is connected to the inner circular surface of the radial connection ring and the two together form a structure with an "L"-shaped cross-section;

[0009] A sealing ring, which is connected to the inner circular surface of the axial connection ring. A main sealing lip is provided at the end of the sealing ring, and the main sealing lip is clamped on the outer circular surface of the rotating shaft by a clamping spring;

[0010] The radial connection ring, the axial connection ring, the sealing ring and the main sealing lip are fixedly connected into an integral structure.

[0011] A secondary sealing lip is further provided on the sealing ring. The secondary sealing lip is in interference fit with the rotating shaft, and the edge of the secondary sealing lip is in close contact with and seals the rotating shaft.

[0012] Two sealing rings are provided. The two sealing rings are arranged in parallel or symmetrically. Main sealing lips are provided at the ends of the two sealing rings, and the main sealing lips are all clamped on the outer circular surface of the rotating shaft by clamping springs.

[0013] The radial connection ring is pressed against the side wall of the bearing end cover by a pressing plate, and the pressing plate, the radial connection ring and the bearing end cover are fixedly connected by bolts.

[0014] An annular groove is provided on the outer circular surface of the axial connection ring, and a hoop is installed in the annular groove. The hoop is clamped on the outer circular surface of the axial connection ring.

[0015] The externally mounted integrated sealing mechanism is an integral ring structure or a split structure.

[0016] Compared with the prior art, the externally mounted integrated sealing mechanism provided by the present utility model has the following advantages: 1. In the present utility model, the radial connection ring, the axial connection ring, the sealing ring, the main sealing lip and the secondary sealing lip are fixedly connected into an integral structure, and the whole sealing mechanism is concentrated in one body, which is convenient for manufacturing, installation and replacement.

[0017] 2. In the present utility model, contact sealing is carried out between the main sealing lip and the secondary sealing lip and the rotating shaft, and the sealing effect is good. Moreover, two or more sealing rings can be provided to perform multi-stage sealing, further improving the sealing effect, and the sealing mechanism has a simple structure.

[0018] 3. In the present utility model, the radial connection ring and the axial connection ring form a cantilever structure, which can ensure the followability and fitting property between the main sealing lip and the secondary sealing lip and the rotating shaft, and ensure adaptation to the roundness runout and operating runout of the rotating shaft; it can also effectively avoid the adverse effect of the eccentricity of the equipment shaft hole on the interference fit between the secondary sealing lip and the rotating shaft.

[0019] 4. In the present utility model, a hoop is clamped on the outer circular surface of the axial connection ring, further ensuring the installation stability and the sealing effect. Description of the Drawings

[0020] Figure 1 Schematic diagram of the overall structure of the externally mounted integrated sealing mechanism provided for Embodiment 1;

[0021] Figure 2 Schematic diagram of the overall structure of the externally mounted integrated sealing mechanism provided for Embodiment 2;

[0022] Figure 3 Schematic diagram of the overall structure of the externally mounted integrated sealing mechanism provided for Embodiment 3 Figure 1 ;

[0023] Figure 4 Schematic diagram of the overall structure of the externally mounted integrated sealing mechanism provided for Embodiment 3 Figure 2 ;

[0024] In the figure: 1 - rotating shaft, 2 - bearing end cover, 3 - sealing cavity, 4 - radial connecting ring, 5 - axial connecting ring, 6 - sealing ring, 7 - pressing plate, 8 - bolt, 9 - main sealing lip, 10 - tightening spring, 11 - secondary sealing lip, 12 - hoop. Specific embodiments

[0025] The following combines the accompanying drawings to make a detailed and specific description of the present utility model.

[0026] Embodiment 1

[0027] The structure of the externally mounted integrated sealing mechanism provided in this embodiment is as Figure 1 shown, installed between the rotating shaft 1 and the bearing end cover 2. The rotating shaft is installed inside the bearing end cover and extends out from the bearing end cover. The gap between the inside of the bearing end cover and the rotating shaft is the sealing cavity 3, and the sealing cavity is sealed by the externally mounted integrated sealing mechanism.

[0028] In this embodiment, the externally mounted integrated sealing mechanism includes a radial connecting ring 4, an axial connecting ring 5, and a sealing ring 6. The radial connecting ring is fixedly attached to the side wall of the bearing end cover. Specifically, the radial connecting ring is pressed and attached to the side wall of the bearing end cover by a pressing plate 7, and the pressing plate, the radial connecting ring, and the bearing end cover are fixedly connected by bolts 8.

[0029] The axial connecting ring is connected to the inner circular surface of the radial connecting ring, and the two together form a structure with an "L"-shaped cross-section, that is, the radial connecting ring and the axial connecting ring together form a cantilever structure. The sealing ring is connected to the inner circular surface of the axial connecting ring. A main sealing lip 9 is provided at the end of the sealing ring, and the main sealing lip is clamped on the outer circular surface of the rotating shaft by a clamping spring 10; a secondary sealing lip 11 is also provided on the sealing ring. The secondary sealing lip is in interference fit with the rotating shaft, and the edge of the secondary sealing lip is in close contact with and seals the rotating shaft. The sealing performance of the entire sealing mechanism is ensured by the main sealing lip and the secondary sealing lip. At the same time, the radial connecting ring and the axial connecting ring form a cantilever structure, which can ensure the followability and fitting between the main sealing lip and the secondary sealing lip and the rotating shaft, and ensure adaptation to the roundness runout and operation runout of the rotating shaft; it can also effectively avoid the adverse effect of the eccentricity of the equipment shaft hole on the interference fit between the secondary sealing lip and the rotating shaft. In this embodiment, the sealing ring is inclined towards the sealing cavity. In actual setting, the sealing ring can also be set to be inclined towards the outside, that is, away from the sealing cavity.

[0030] In this embodiment, the radial connecting ring, the axial connecting ring, the sealing ring, the main sealing lip and the secondary sealing lip are fixedly connected into an integral structure, and the entire sealing mechanism is concentrated in one body, which is convenient for manufacturing, installation and replacement.

[0031] In this embodiment, an annular groove is provided on the outer circular surface of the axial connecting ring, and a retaining hoop 12 is installed in the annular groove. The retaining hoop is clamped on the outer circular surface of the axial connecting ring to further ensure the installation stability and sealing performance of the sealing mechanism.

[0032] In this embodiment, the externally mounted integrated sealing mechanism is an integral ring structure or a split structure.

[0033] Embodiment 2

[0034] The structure of the externally mounted integrated sealing mechanism provided in this embodiment is basically the same as that in Embodiment 1, except that in this embodiment, there are two sealing rings, and the two sealing rings are arranged in parallel, as Figure 2 shown. Main sealing lips are provided at the ends of both sealing rings, and the main sealing lips are clamped on the outer circular surface of the rotating shaft by clamping springs. Specifically, secondary sealing lips are provided on both sealing rings. The secondary sealing lips are in interference fit with the rotating shaft, and the edges of the secondary sealing lips are in close contact with and seal the rotating shaft. The sealing performance and effect are further ensured through two-stage sealing; moreover, the two-stage sealing is concentrated in one body, which is convenient for installation.

[0035] In actual setting, the number of sealing rings can also be set to more than three as required.

[0036] Embodiment 3

[0037] The structure of the externally mounted integrated sealing mechanism provided in this embodiment is basically the same as that of Embodiment 1, except that in this embodiment, there are two sealing rings, and the two sealing rings are symmetrically arranged, as Figure 3 or Figure 4 shown. Main sealing lips are provided at the ends of both sealing rings, and the main sealing lips are tightened on the outer cylindrical surface of the rotating shaft by tightening springs. Specifically, secondary sealing lips are provided on both sealing rings, the secondary sealing lips are in interference fit with the rotating shaft, and the edges of the secondary sealing lips are in close contact with and sealed to the rotating shaft. The two-stage sealing further ensures the sealing performance and effect; moreover, the two-stage sealing is integrated, which is convenient for installation.

Claims

1. An externally mounted integrated sealing mechanism is installed between a rotating shaft and a bearing end cover. The rotating shaft is installed inside the bearing end cover and extends out from the bearing end cover. The gap between the inside of the bearing end cover and the rotating shaft is a sealing cavity, and it is characterized in that: The external integrated sealing mechanism includes: A radial connection ring, which is fixedly attached to the side wall of the bearing end cover; An axial connection ring, which is connected to the inner circular surface of the radial connection ring and the two together form an "L"-shaped cross-sectional structure; A sealing ring, which is connected to the inner circular surface of the axial connection ring. A main sealing lip is provided at the end of the sealing ring, and the main sealing lip is clamped on the outer circular surface of the rotating shaft by a tightening spring; The radial connection ring, the axial connection ring, the sealing ring and the main sealing lip are fixedly connected into an integral structure.

2. The external integrated sealing mechanism according to claim 1, wherein: A secondary sealing lip is also provided on the sealing ring. The secondary sealing lip is in interference fit with the rotating shaft and the edge of the secondary sealing lip is in close contact with and seals the rotating shaft.

3. The external integrated sealing mechanism according to claim 1, characterized in that: There are two sealing rings. The two sealing rings are arranged in parallel or symmetrically. Main sealing lips are provided at the ends of both sealing rings, and the main sealing lips are clamped on the outer circular surface of the rotating shaft by tightening springs.

4. The external integrated sealing mechanism according to claim 1, characterized in that: The radial connection ring is pressed against the side wall of the bearing end cover by a pressing plate, and the pressing plate, the radial connection ring and the bearing end cover are fixedly connected by bolts.

5. The external integrated sealing mechanism according to claim 1, characterized in that: An annular groove is provided on the outer circular surface of the axial connection ring, and a hoop is installed in the annular groove. The hoop is clamped on the outer circular surface of the axial connection ring.

6. The external integrated sealing mechanism according to claim 1, characterized in that: The external integrated sealing mechanism is an integral ring structure or a split structure.

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