Guide vane middle shaft neck sealing structure

Abstract

The utility model provides a guide vane middle shaft neck sealing structure which comprises a guide vane middle shaft sleeve, a guide vane sleeve is arranged on the outer side wall of the guide vane middle shaft sleeve, an L-shaped sealing ring is arranged at the bottom of the guide vane middle shaft sleeve, a first sealing cavity is formed in the lower end of the inner wall of the guide vane middle shaft sleeve, and a second sealing cavity is formed in the outer side wall of the guide vane sleeve. The guide vane middle journal sealing structure can solve the problems of short service life, limited compensation amount, large abrasion, poor sealing effect, inconvenience in field installation and the like of a traditional guide vane middle journal sealing structure, the sealing effect is improved, leakage is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering machinery and equipment technology, specifically to a guide vane journal sealing structure. Background Technology

[0002] Existing sealing technology systems include core structures such as mechanical seals, soft packing seals, sealing ring seals, and labyrinth seals. Among them, mechanical seals achieve sealing under high-pressure and high-speed conditions through the precise fit between the dynamic and static rings; soft packing seals form a sealing interface by using the axial force of the compressed flexible packing, and are suitable for low-pressure and medium-speed scenarios; sealing ring seals (such as O-rings and L-rings) utilize the deformation of elastic materials to fill the sealing gap, and are mostly used for static or low-speed rotating seals; labyrinth seals reduce leakage by designing a meandering flow path and are commonly found in high-temperature and high-speed rotating equipment.

[0003] In the field of traditional guide vane journal sealing, L-shaped rubber sealing rings are commonly used. Their principle is to achieve a seal by utilizing the initial compression of the rubber material during initial installation, through an interference fit between the rubber material and the sealing cavity. However, this structure has significant technical drawbacks:

[0004] Insufficient compensation capacity: Its structure uses rubber sealing material to make an interference seal with the sealing cavity. Its compensation amount is only a small amount of interference at the initial installation. When the wear on the grinding surface exceeds the interference amount, the sealing effect will be reduced or even disappear.

[0005] The installation process is complex: because the sealing material is a relatively soft rubber material, and its structure is L-shaped with an interference seal at the radial sealing position, it is easy for the long side lip to turn up during on-site installation, making on-site installation difficult and increasing maintenance costs.

[0006] Limited durability: The traditional guide vane journal seal structure adopts a conventional interference seal structure, which has a relatively short compensation amount. The small compensation amount also means that its service life is relatively short and the seal replacement cycle is fast.

[0007] Therefore, there is an urgent need for a guide vane journal sealing structure to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a guide vane journal sealing structure to solve the problems mentioned in the background art.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a guide vane journal sealing structure, including a guide vane central shaft sleeve, a guide vane sleeve provided on the outer wall of the guide vane central shaft sleeve, an L-shaped sealing ring provided at the bottom of the guide vane central shaft sleeve, a first sealing cavity provided at the lower end of the inner wall of the guide vane central shaft sleeve, and a second sealing cavity provided on the outer wall of the guide vane sleeve.

[0010] Preferably, both the first sealing cavity and the second sealing cavity are open cavities.

[0011] Preferably, the second sealing cavity is located at the bottom end of the outer wall of the guide vane sleeve. When the bottom of the guide vane bushing and the guide vane sleeve are flush, the first sealing cavity and the second sealing cavity are located on the same plane.

[0012] Preferably, after installation, the openings of the first and second sealing cavities are positioned opposite each other.

[0013] Preferably, the first sealing cavity is provided with a compensating O-ring and a counter-grip sealing ring, the compensating O-ring being close to the inner wall of the first sealing cavity, and the counter-grip sealing ring being close to the open cavity opening of the first sealing cavity.

[0014] Preferably, the cross-section of the mating seal ring is E-shaped, and the mating seal ring is made of high-strength elastic wear-resistant material.

[0015] Preferably, the compensating O-ring has a circular cross-section and is made of a flexible elastic material.

[0016] Preferably, an O-ring is provided in the inner cavity of the second sealing cavity, and the O-ring is made of a flexible elastic material.

[0017] Preferably, the inner wall of the guide vane bushing is provided with a wear-resistant layer, which is made of a high-strength elastic wear-resistant material.

[0018] Preferably, the guide vane central shaft sleeve, guide vane bushing, compensating O-ring, mating ring, L-ring and O-ring are all designed as independent modules, and each structural module is installed to the guide vane central shaft journal seal in sequence during use.

[0019] The present invention has the following beneficial effects:

[0020] 1. The sealing effect of this utility model is significantly improved: the application of multiple sealing structures and self-adjusting sealing technology significantly improves the sealing effect and reduces leakage;

[0021] 2. This utility model is easy to maintain: the modular design of the sealed structure facilitates installation and disassembly;

[0022] 3. Extended service life: The introduction of new wear-resistant materials significantly extends the service life of the sealing components;

[0023] 4. This utility model reduces maintenance costs: The modular design and quick replacement system make the maintenance and replacement of sealing components more convenient, reducing equipment downtime and maintenance costs;

[0024] 5. This utility model has a wide range of applications: the new sealing structure can adapt to various working conditions, including extreme conditions such as high pressure, high speed and high temperature, and has a wide range of applicability. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the application structure of this utility model;

[0026] Figure 2 for Figure 1 Enlarged view of the middle K point;

[0027] Figure 3 This is a top view of the structure of this utility model. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] See Figures 1 to 3 A guide vane journal sealing structure includes a guide vane journal sleeve 1, a guide vane sleeve 2 on the outer wall of the guide vane journal sleeve 1, an L-shaped sealing ring 6 at the bottom of the guide vane journal sleeve 1, a first sealing cavity 5 at the lower end of the inner wall of the guide vane journal sleeve 1, and a second sealing cavity 8 on the outer wall of the guide vane sleeve 2. By placing the conventional guide vane journal sealing cavity structure within the inner diameter of the guide vane journal sleeve 1, the installation space is shortened while reducing unnecessary sealing cavity installation components.

[0030] Preferably, both the first sealing cavity 5 and the second sealing cavity 8 are open cavities.

[0031] Preferably, the second sealing cavity 8 is located at the bottom of the outer wall of the guide vane sleeve 2. When the bottom of the guide vane bushing 1 and the guide vane sleeve 2 are flush, the first sealing cavity 5 and the second sealing cavity 8 are located on the same plane.

[0032] Preferably, after installation, the openings of the first sealing cavity 5 and the second sealing cavity 8 are positioned opposite each other.

[0033] Preferably, the first sealing cavity 5 is provided with a compensating O-ring 3 and a mating sealing ring 4. The compensating O-ring 3 is close to the inner wall of the first sealing cavity 5, and the mating sealing ring 4 is close to the open cavity of the first sealing cavity 5. The mating position with the guide vane journal, combined with the compensation mechanism of the compensating O-ring 3 on the outer diameter of the mating sealing ring 4, extends its service life on top of the original wear-resistant service life, improves the sealing effect, reduces leakage, and greatly reduces maintenance and repair costs.

[0034] Preferably, the wear-resistant sealing ring 4 has an E-shaped cross-section and is made of a high-strength, elastic, and wear-resistant material. The wear-resistant sealing ring 4 uses a modified polyurethane elastomer wear-resistant material to improve its service life.

[0035] Preferably, the compensating O-ring 3 has a circular cross-section and is made of a flexible elastic material. The compensating O-ring 3 can also be made of rubber.

[0036] Preferably, an O-ring 7 is provided in the inner cavity of the second sealing cavity 8, and the O-ring 7 is made of a flexible elastic material.

[0037] Preferably, the inner wall of the guide vane bushing 1 is provided with a wear-resistant layer 1.1, which is made of a high-strength elastic wear-resistant material. A modified polyurethane elastomer wear-resistant material is used.

[0038] Preferably, the guide vane central shaft sleeve 1, guide vane sleeve 2, compensating O-ring seal 3, rubbing seal 4, L-ring seal 6, and O-ring 7 are all designed as independent modules. During use, each structural module is sequentially installed to the guide vane central shaft journal seal. By using independent modules for each part, after prolonged operation and failure, seal replacement only requires selective replacement of the old seal structure based on wear conditions, without the need for complete replacement. Furthermore, since the structure is designed on the guide vane central shaft sleeve, before installation, only the compensating O-ring seal 3 and rubbing seal 4 need to be sequentially installed into the first sealing cavity 5 before being installed together with the guide vane central shaft sleeve 1. This modular design enables rapid installation and disassembly of the sealing components, improving maintenance efficiency.

[0039] The working principle of this embodiment is as follows:

[0040] When applying this utility model, first prepare each structural module. First, install the L-shaped sealing ring 6 at the bottom corner of the guide vane journal. Then, install the compensating O-ring 3 and the mating sealing ring 4 in the first sealing cavity 5 of the guide vane journal 1 in sequence. Install the O-ring 3 in the second sealing cavity 8 of the guide vane sleeve 2. Then, install the guide vane journal 1 on the top wall of the L-shaped sealing ring 6 in sequence, and install the guide vane sleeve 2 on the outer wall of the guide vane journal 1. When installing, pay attention to installing the bottom walls of the guide vane journal 1 and the guide vane sleeve 2 on the same plane.

[0041] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A guide vane journal sealing structure, comprising a guide vane journal sleeve (1), characterized in that: The outer wall of the guide vane bushing (1) is provided with a guide vane sleeve (2), the bottom of the guide vane bushing (1) is provided with an L-shaped sealing ring (6), the lower end of the inner wall of the guide vane bushing (1) is provided with a first sealing cavity (5), and the outer wall of the guide vane sleeve (2) is provided with a second sealing cavity (8).

2. The guide vane journal sealing structure according to claim 1, characterized in that: Both the first sealing cavity (5) and the second sealing cavity (8) are open cavities.

3. The guide vane journal sealing structure according to claim 1, characterized in that: The second sealing cavity (8) is located at the bottom of the outer wall of the guide vane sleeve (2). When the bottom of the guide vane bushing (1) and the guide vane sleeve (2) are flush, the first sealing cavity (5) and the second sealing cavity (8) are in the same plane.

4. The guide vane journal sealing structure according to claim 3, characterized in that: After installation, the openings of the first sealing cavity (5) and the second sealing cavity (8) are set opposite to each other.

5. The guide vane journal sealing structure according to claim 1, characterized in that: The first sealing cavity (5) is provided with a compensating O-ring (3) and a counter-grinding sealing ring (4). The compensating O-ring (3) is close to the inner wall of the first sealing cavity (5), and the counter-grinding sealing ring (4) is close to the open cavity of the first sealing cavity (5).

6. The guide vane journal sealing structure according to claim 5, characterized in that: The cross section of the grinding seal ring (4) is E-shaped, and the grinding seal ring (4) is made of high-strength elastic wear-resistant material.

7. The guide vane journal sealing structure according to claim 5, characterized in that: The compensation O-ring (3) has a circular cross-section and is made of flexible elastic material.

8. The guide vane journal sealing structure according to claim 1, characterized in that: The second sealing cavity (8) is provided with an O-ring (7), which is made of flexible elastic material.

9. The guide vane journal sealing structure according to claim 1, characterized in that: The inner wall of the guide vane bushing (1) is provided with a wear-resistant layer (1.1), which is made of high-strength elastic wear-resistant material.

10. The guide vane journal sealing structure according to claim 1, characterized in that: The guide vane central shaft sleeve (1), guide vane sleeve (2), compensation O-ring seal (3), grinding seal (4), L-ring seal (6) and O-ring (7) are all designed as independent modules. When in use, each structural module is installed to the guide vane central shaft journal seal in sequence.

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