Built-in integrated sealing mechanism

Abstract

The utility model provides a built-in integrated sealing mechanism, which is mounted in a mounting groove arranged on the side wall of a bearing end cover and sleeved on a rotating shaft, and comprises a radial connecting ring, a sealing ring and a sealing ring, the sealing ring is connected to the inner circular surface of the radial connecting ring and extends into the mounting groove, a main sealing lip is arranged at the end part of the sealing ring, and the main sealing lip is hooped on the outer circular surface of the rotating shaft through a hooping spring; the radial 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 provides an internal integrated sealing mechanism, belonging to the technical field of mechanical seals. Background Technique

[0002] A mechanical seal is a device to prevent fluid leakage in equipment. Contact seal and labyrinth seal are two main forms of mechanical seals. Among them, the labyrinth seal is provided with several annular seal teeth arranged in sequence around the rotating shaft. 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. Therefore, 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 it can also prevent external pollutants from entering the inside of 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 internal 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. The sealing effect is good. At the same time, the entire sealing mechanism is in a cantilever structure, ensuring the followability and fitting property between the sealing lip and the rotating shaft, adapting to the roundness runout and operational runout of the rotating shaft, and the entire sealing mechanism is integrated, which is convenient for installation.

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

[0006] An internal integrated sealing mechanism is installed in the installation groove provided on the side wall of the bearing end cover and sleeved on the rotating shaft. 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 the sealed cavity. The internal integrated sealing mechanism includes:

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

[0008] A sealing ring is connected to the inner circular surface of the radial connecting ring and extends into the installation groove. 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;

[0009] The radial connecting ring, the sealing ring and the main sealing lip are fixedly connected into an integral structure.

[0010] 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.

[0011] An axial connecting ring is connected to the inner circular surface of the radial connecting ring, and the sealing ring is connected to the inner circular surface of the axial connecting ring; the radial connecting ring and the axial connecting ring together form an "L"-shaped cross-section structure, and the axial connecting ring extends into the installation groove.

[0012] An annular groove is provided on the outer circular surface of the axial connecting ring, and a hoop is installed in the annular groove. The hoop is clamped on the outer circular surface of the axial connecting ring.

[0013] 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 clamped on the outer circular surface of the rotating shaft by clamping springs.

[0014] The radial connecting ring is pressed against the side wall of the bearing end cover by a pressing plate, and the pressing plate, the radial connecting ring and the bearing end cover are fixedly connected by bolts.

[0015] The built-in integrated sealing mechanism is of an integral annular structure or a split structure.

[0016] Compared with the prior art, the built-in integrated sealing mechanism provided by the present utility model has the following advantages: 1. In the present utility model, 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. 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 carry out 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 connecting ring alone or together with the axial connecting ring forms a cantilever structure, which can ensure the followability and fit 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 fastened on the outer circumferential surface of the axial connection ring to further ensure the installation stability and sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic diagram of the overall structure of the built-in integrated sealing mechanism provided in Embodiment 1;

[0021] Figure 2 FIG. is a schematic diagram of the overall structure of the built-in integrated sealing mechanism provided in Embodiment 2;

[0022] Figure 3 FIG. is a schematic diagram of the overall structure of the built-in integrated sealing mechanism provided in Embodiment 3;

[0023] Figure 4 FIG. is a schematic diagram of the overall structure of the built-in integrated sealing mechanism provided in Embodiment 4 Figure 1 ;

[0024] Figure 5 FIG. is a schematic diagram of the overall structure of the built-in integrated sealing mechanism provided in Embodiment 4 Figure 2 ;

[0025] In the figure: 1 - rotating shaft, 2 - bearing end cover, 3 - installation groove, 4 - sealing cavity, 5 - radial connection ring, 6 - sealing ring, 7 - pressing plate, 8 - bolt, 9 - main sealing lip, 10 - tightening spring, 11 - secondary sealing lip, 12 - axial connection ring, 13 - hoop. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present utility model will be described in detail below with reference to the accompanying drawings.

[0027] Embodiment 1

[0028] The structure of the built-in integrated sealing mechanism provided in this embodiment is as Figure 1 shown, installed in the installation groove 3 provided on the side wall of the bearing end cover 2 and sleeved on the rotating shaft 1, 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 the sealing cavity 4, and the sealing cavity is sealed by the built-in integrated sealing mechanism.

[0029] In this embodiment, the built-in integrated sealing mechanism includes a radial connection ring 5 and a sealing ring 6. The radial connection ring is fixedly attached to the side wall of the bearing end cover. Specifically, the radial connection ring is pressed against the side wall of the bearing end cover by a pressing plate 7 and is fixedly connected to the pressing plate, the radial connection ring and the bearing end cover by bolts 8.

[0030] The sealing ring is connected to the inner circular surface of the radial connection ring and extends into the installation groove. A main sealing lip 9 is provided at the end of the sealing ring, and the main sealing lip is tightened on the outer circular surface of the rotating shaft by a tightening 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 connection ring forms a cantilever structure, which can ensure the followability and conformity 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.

[0031] In this embodiment, the radial connection 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.

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

[0033] Embodiment 2

[0034] The structure of the built-in integrated sealing mechanism provided in this embodiment is basically the same as that of Embodiment 1, except that in this embodiment, an axial connection ring 12 is connected to the inner circular surface of the radial connection ring, and the sealing ring is connected to the inner circular surface of the axial connection ring; the radial connection ring and the axial connection ring together form an "L"-shaped cross-section structure, and the axial connection ring extends into the installation groove. At this time, the radial connection ring and the axial connection ring together form a cantilever structure.

[0035] Furthermore, an annular groove is provided on the outer circular surface of the axial connection ring, and a hoop 13 is installed in the annular groove. The hoop is tightened on the outer circular surface of the axial connection ring, and the axial connection ring supports the radial connection ring, further ensuring the installation stability and sealing performance of the sealing mechanism.

[0036] Embodiment 3

[0037] The structure of the built-in integrated sealing mechanism provided in this embodiment is basically the same as that of Embodiment 2, except that in this embodiment, two sealing rings are provided, and the two sealing rings are arranged in parallel, as Figure 3 shown. Main sealing lips are provided at the ends of both sealing rings, and the main sealing lips are both tightened on the outer circular 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 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.

[0038] In actual setting, more than three sealing rings can also be provided according to needs.

[0039] Example 4

[0040] The structure of the built-in integrated sealing mechanism provided in this embodiment is basically the same as that of Embodiment 2, except that there are two sealing rings in this embodiment, and the two sealing rings are symmetrically arranged, as Figure 4 or Figure 5 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 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 sealed to the rotating shaft. The two-stage sealing further ensures the sealing performance and effect; moreover, the two-stage sealing is concentrated in one body, which is convenient for installation.

Claims

1. An internal integrated sealing mechanism is installed in an installation groove provided on the side wall of a bearing end cover and sleeved on a rotating shaft. The rotating shaft is installed in the bearing end cover and extends out of 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 built-in integrated sealing mechanism includes: A radial connection ring, which is fixedly attached to the side wall of the bearing end cover; A sealing ring, which is connected to the inner circular surface of the radial connection ring and extends into the installation groove. 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; The radial connection ring, the sealing ring and the main sealing lip are fixedly connected into an integral structure.

2. The built-in 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 built-in integrated sealing mechanism according to claim 1, characterized in that: An axial connection ring is connected to the inner circular surface of the radial connection ring, and the sealing ring is connected to the inner circular surface of the axial connection ring; the radial connection ring and the axial connection ring together form an "L"-shaped cross-sectional structure, and the axial connection ring extends into the installation groove.

4. The built-in integrated sealing mechanism according to claim 3, characterized in that: An annular groove is provided on the outer circular surface of the axial connection ring, and a retaining hoop is installed in the annular groove. The retaining hoop is clamped on the outer circular surface of the axial connection ring.

5. The built-in integrated sealing mechanism according to claim 3, characterized in that: There are two sealing rings, which 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 clamping springs.

6. The built-in integrated sealing mechanism according to claim 1, wherein: 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.

7. The built-in integrated sealing mechanism according to claim 1, wherein: The built-in integrated sealing mechanism is of an integral annular structure or a split structure.

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