Guide vane sleeve combination bearing applied to tubular turbine

Abstract

The utility model discloses a guide vane sleeve combination bearing applied to a tubular turbine, which comprises a bearing seat, and a shaft sleeve groove penetrates through the middle of the bearing seat. According to the utility model, the bearing seat cast by stainless steel avoids the influence of welding stress, the sealing performance, the oxidation resistance and the corrosion resistance of the bearing seat are greatly improved, the service life of the bearing seat is greatly prolonged, and the shaft sleeve made of the high-strength modified polycaprolactam and molybdenum disulfide homogeneous high polymer material has good self-lubricating performance; the novel combined bearing has the advantages of no need of additional lubricant, close dynamic friction coefficient and static friction coefficient, no creeping phenomenon during working, low water absorption rate, excellent dimensional stability, no abrasion to a rotating shaft and no chemical corrosion problem, and compared with the original combined bearing assembly, the novel combined bearing is more reliable and simple in structural design, easy to maintain, low in water absorption rate, more stable in size, good in rigidity and high in reliability. The problems of welding deformation and corrosion of an existing guide vane sleeve and water absorption expansion and delamination of a combined bearing are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine bearings, in particular to a guide vane sleeve combined bearing applied to a tubular water turbine. Background Art

[0002] A water turbine is a power machine that converts the energy of water flow into rotational mechanical energy. It belongs to the turbine machinery among fluid machinery. When a water turbine is used, a guide vane sleeve combination bearing is required.

[0003] Some problems have been found in the use of the existing turbine guide vane sleeve combination bearings. The bearing seat flange and the bearing seat cylinder adopt a welded structure. Due to the influence of welding stress changes and the design characteristics of the welded structure, they are prone to deformation and rust, which will cause the seal between the guide vane sleeve and the movable guide vane to fail and cause water leakage accidents. In severe cases, it will cause major accidents such as flooding of the factory building. The shaft sleeve made of polysulfone polymer material has water absorption and expansion, and the structural size is unstable, which may cause operating accidents such as the movable guide vane getting stuck and refusing to move. At the same time, the polytetrafluoroethylene polymer lined shaft sleeve is prone to wear, delamination and relative sliding with the polysulfone polymer shaft sleeve after long-term operation, which is inconvenient to use. Utility Model Content

[0004] The purpose of the utility model is to provide a guide vane sleeve combined bearing for a tubular turbine, so that the new combined bearing is more reliable, simpler and easier to maintain in structural design than the original combined bearing assembly, has low water absorption, more stable size and good rigidity, and solves the problems of welding deformation and rust of the existing guide vane sleeve and water absorption expansion and delamination of the combined bearing.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a guide vane sleeve combined bearing used in a tubular turbine, comprising a bearing seat, a shaft sleeve groove running through the middle of the bearing seat, and a mounting flange fixedly connected to the outer side of one end of the bearing seat, wherein:

[0006] The bearing seat is provided with a connecting groove at one end close to the mounting flange, the inner end of the connecting groove is provided with first screw holes at equal distances, and the inner wall of the shaft sleeve groove away from the mounting flange is provided with a sealing ring groove;

[0007] A shaft sleeve is arranged in the shaft sleeve groove, a connecting flange is fixedly connected to the end of the shaft sleeve corresponding to the connecting groove, and a second screw hole penetrates through the position of the connecting flange corresponding to the first screw hole.

[0008] Preferably, the bearing seat is integrally cast from stainless steel material.

[0009] Preferably, the shaft sleeve is made of a high-strength modified polycaprolactam + molybdenum disulfide homogeneous polymer material.

[0010] Preferably, the outer diameter of the shaft sleeve matches the inner diameter of the shaft sleeve groove, and two sealing ring grooves are provided on the inner wall of the shaft sleeve groove, and a sealing ring can be embedded in the sealing ring groove.

[0011] Preferably, the outer diameter of the connecting flange matches the inner diameter of the connecting groove, and the inner width of the connecting groove matches the thickness of the connecting flange.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model discloses a combined bearing which is formed by combining a bearing seat and a shaft sleeve. The bearing seat cast from stainless steel avoids the influence of welding stress and greatly improves the sealing performance, oxidation resistance, corrosion resistance and service life of the bearing seat. The shaft sleeve made of high-strength modified polycaprolactam + molybdenum disulfide homogeneous polymer material has good self-lubricating performance and is maintenance-free after installation. No additional lubricant is required during the entire service life. The dynamic friction coefficient is close to the static friction coefficient, there is no creeping phenomenon during operation, the water absorption rate is low, the dimensional stability is excellent, there is no wear on the rotating shaft, and there is no chemical corrosion problem. Compared with the original combined bearing assembly, the new combined bearing is more reliable, simple and easy to maintain in structural design, has low water absorption rate, more stable size and good rigidity, and solves the problems of welding deformation and rust of the existing guide vane sleeve and water absorption expansion and delamination of the combined bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the bearing seat of the utility model;

[0016] Figure 3 For this utility model Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0017] In the figure: 1. bearing seat; 2. sleeve groove; 3. mounting flange; 4. connecting groove; 5. first screw hole; 6. sealing ring groove; 7. sleeve; 8. connecting flange; 9. second screw hole. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figures 1 to 3The utility model provides a technical solution: a guide vane sleeve combined bearing used for a tubular turbine, comprising a bearing seat 1, a shaft sleeve groove 2, a mounting flange 3, a connecting groove 4, a first screw hole 5, a sealing ring groove 6, a shaft sleeve 7, a connecting flange 8, and a second screw hole 9. The shaft sleeve groove 2 runs through the middle of the bearing seat 1, and the mounting flange 3 is fixedly connected to the outer side of one end of the bearing seat 1, wherein:

[0020] The bearing seat 1 is provided with a connection groove 4 at one end close to the mounting flange 3, and the inner end of the connection groove 4 is provided with first screw holes 5 at equal distances, and the inner wall of the shaft sleeve groove 2 away from the mounting flange 3 is provided with a sealing ring groove 6;

[0021] A shaft sleeve 7 is disposed in the shaft sleeve groove 2 , and a connecting flange 8 is fixedly connected to the end of the shaft sleeve 7 corresponding to the connecting groove 4 , and a second screw hole 9 penetrates the connecting flange 8 at a position corresponding to the first screw hole 5 .

[0022] See also Figures 1 to 3 The bearing seat 1 is integrally cast from stainless steel material, and the sleeve 7 is made of high-strength modified polycaprolactam + molybdenum disulfide homogeneous polymer material. The combined bearing is formed by the bearing seat 1 and the sleeve 7. The bearing seat 1 cast from stainless steel avoids the influence of welding stress, and greatly improves the sealing performance, anti-oxidation, anti-corrosion performance and service life of the bearing seat. The sleeve 7 made of high-strength modified polycaprolactam + molybdenum disulfide homogeneous polymer material has good self-lubricating performance, maintenance-free after installation, and no additional lubricant is required during the entire life cycle. The dynamic friction coefficient and the static friction coefficient are close, there is no creeping phenomenon during operation, the water absorption rate is low, the dimensional stability is excellent, and there is no wear on the rotating shaft and no chemical corrosion problem. Compared with the original combined bearing assembly, the new combined bearing is more reliable, simple, and easy to maintain in structural design, and has a low water absorption rate, more stable size, and good rigidity, which solves the welding deformation and rust of the existing guide vane sleeve and the water absorption expansion and delamination problems of the combined bearing.

[0023] See also Figures 1 to 3 The outer diameter of the shaft sleeve 7 is consistent with the inner diameter of the shaft sleeve groove 2, and there are two sealing ring grooves 6 opened on the inner wall of the shaft sleeve groove 2. The sealing ring can be embedded in the sealing ring groove 6. The outer diameter of the connecting flange 8 is consistent with the inner diameter of the connecting groove 4, and the inner width of the connecting groove 4 is consistent with the thickness of the connecting flange 8. When the combined bearing is spliced, the sealing ring is first embedded in the sealing ring groove 6, and then the shaft sleeve 7 enters the interior of the shaft sleeve groove 2 from the connecting groove 4, and the connecting flange 8 enters the connecting groove 4 at the same time. After the first screw hole 5 and the second screw hole 9 are aligned, the connecting flange 8 and the bearing seat 1 are fixedly connected by bolts, which is convenient for assembling the combined bearing.

[0024] Working principle: This guide vane sleeve combined bearing is used in a tubular turbine. The combined bearing is formed by a bearing seat 1 and a sleeve 7. The bearing seat 1 made of stainless steel casting avoids the influence of welding stress and greatly improves the sealing performance, anti-oxidation, anti-corrosion performance and service life of the bearing seat. The sleeve 7 made of high-strength modified polycaprolactam + molybdenum disulfide homogeneous polymer material has good self-lubricating properties and is maintenance-free after installation. No additional lubricant is required during the entire service life. The dynamic friction coefficient and static friction coefficient are close, there is no creeping phenomenon during operation, low water absorption, excellent dimensional stability, no wear on the rotating shaft, and no chemical corrosion problems. Compared with the original combined bearing assembly, the new combined bearing is more reliable and simple in structural design. , easy to maintain, with low water absorption, more stable size and good rigidity, which solves the welding deformation and rust of the existing guide vane sleeve and the water absorption expansion and delamination problems of the combined bearing. When the combined bearing is spliced, the sealing ring is first embedded in the sealing ring groove 6, and then the shaft sleeve 7 enters the interior of the shaft sleeve groove 2 from the connecting groove 4, and the connecting flange 8 enters the connecting groove 4 at the same time. After the first screw hole 5 and the second screw hole 9 are aligned, the connecting flange 8 and the bearing seat 1 are fixedly connected by bolts, which is convenient for assembling the combined bearing. The combined bearing parts adopt a domestically produced design, and the structural design is more reliable, simple and easy to maintain, the procurement cycle is short, the procurement cost is low, and the structural size and technical parameters of the spare parts are completely better than the original design requirements.

[0025] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A guide vane sleeve combined bearing for use in a tubular turbine, comprising a bearing seat (1), characterized in that: A shaft sleeve groove (2) runs through the middle of the bearing seat (1), and a mounting flange (3) is fixedly connected to the outer side of one end of the bearing seat (1), wherein: The bearing seat (1) is provided with a connection groove (4) at one end close to the mounting flange (3), the inner end of the connection groove (4) is provided with first screw holes (5) at equal distances, and the inner wall of the shaft sleeve groove (2) away from the mounting flange (3) is provided with a sealing ring groove (6); A shaft sleeve (7) is arranged in the shaft sleeve groove (2); a connecting flange (8) is fixedly connected to the end of the shaft sleeve (7) corresponding to the connecting groove (4); and a second screw hole (9) passes through the position of the connecting flange (8) corresponding to the first screw hole (5).

2. The guide vane sleeve combined bearing for a tubular turbine according to claim 1, characterized in that: The bearing seat (1) is integrally cast from stainless steel material.

3. The guide vane sleeve combined bearing for a tubular turbine according to claim 1, characterized in that: The outer diameter of the shaft sleeve (7) matches the inner diameter of the shaft sleeve groove (2), and two sealing ring grooves (6) are provided on the inner wall of the shaft sleeve groove (2), and a sealing ring can be embedded in the sealing ring groove (6).

4. The guide vane sleeve combined bearing for a tubular turbine according to claim 1, characterized in that: The outer diameter of the connecting flange (8) matches the inner diameter of the connecting groove (4), and the inner width of the connecting groove (4) matches the thickness of the connecting flange (8).

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