A push-pull rod sealing structure for steam turbine

Abstract

The present invention provides a push-pull rod sealing structure for a steam turbine, comprising a push-pull rod arranged on a bearing box, a cooling sleeve arranged on the push-pull rod, a sealing mechanism 1 between the cooling sleeve and the push-pull rod, a sealing mechanism 2 between the push-pull rod and the bearing box, and a sealing mechanism 3 in the bearing box, wherein an oil return pipe is arranged on the cooling sleeve, and the oil return pipe opens downward and is connected to the bearing box, wherein the sealing mechanism 1 comprises a sealing ring and an inner oil baffle 1, which are arranged without gap between the push-pull rod and the cooling sleeve, wherein the sealing mechanism 2 comprises a sealing ring, a packing, and a packing gland, wherein the sealing ring, the packing, and the packing gland are arranged in sequence from the inside to the outside between the bearing box and the push-pull rod, and wherein the sealing mechanism 3 comprises a sealing ring and an inner oil baffle 2 arranged at both ends of the push-pull rod from the inside to the outside. The present invention greatly reduces the oil leakage of the steam turbine, greatly reduces the working difficulty of the staff, eliminates major safety hazards such as equipment fire, and provides effective guarantee for the safe operation of the unit.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine sealing structures in thermal power plants, and in particular relates to a steam turbine push-pull rod sealing structure. Background Art

[0002] In the prior art, the push-pull rod sealing structure of the steam turbine experiences oil leakage during operation, resulting in obvious oil stains on the valve sandwich valve and pipeline insulation, causing multiple unsafe phenomena such as smoke in the steam turbine middle box insulation, which greatly affects the safe operation of the unit and increases maintenance costs. Summary of the invention

[0003] The invention provides a push-pull rod sealing structure for a steam turbine, which reduces oil leakage and ensures safe operation of the unit.

[0004] The technical solution of the present invention is: a push-pull rod sealing structure of a steam turbine, comprising a push-pull rod arranged on a bearing box, a cooling sleeve arranged on the push-pull rod, a sealing mechanism one between the cooling sleeve and the push-pull rod, a sealing mechanism two between the push-pull rod and the bearing box, and a sealing mechanism three in the bearing box, wherein the cooling sleeve is provided with an oil return pipe, and the opening of the oil return pipe is downwardly connected to the bearing box, the sealing mechanism one comprises a sealing ring and an inner oil stopper one, which are arranged without gap between the push-pull rod and the cooling sleeve, the sealing mechanism two comprises a sealing ring, a packing, and a packing pressure cover, and the sealing ring, the packing, and the packing pressure cover are arranged in sequence from the inside to the outside between the bearing box and the push-pull rod, and the sealing mechanism three comprises a sealing ring and an inner oil stopper two which are arranged at both ends of the push-pull rod from the inside to the outside.

[0005] The solution further provides an arc-shaped oil baffle on the upper portion of the bearing box, which is arranged at the connection between the push-pull rod and the bearing box to further enhance the sealing performance and block the oil spraying to the push-pull rod, thereby reducing the chance of oil leakage.

[0006] In a further embodiment, the sealing mechanism three also includes a baffle reinforcement ring, which is made of stainless steel and is sleeved and fixed on the outside of the inner oil baffle two.

[0007] According to a further solution, the packing is a graphite nickel wire packing.

[0008] According to a further solution, the packing gland is composed of a circular ring with an opening at one end and bolts connecting the opening of the circular ring, so that the tightness can be easily adjusted.

[0009] According to a further solution, a plurality of screw rods are symmetrically arranged outside the push-pull rod inside the bearing box, a mounting hole is arranged on the second inner oil stopper, and the screw rods pass through the mounting hole to fix the second inner oil stopper and the push-pull rod.

[0010] The advantages of the present invention are: after the application of the present invention, the oil leakage is reduced, the daily maintenance of the turbine body is greatly reduced, and a large amount of turbine oil is also saved, achieving the purpose of energy saving and efficiency improvement; with the elimination of the leakage point, effective guarantee is provided for the safe operation of the unit, and the compression bolt can be loosened or tightened according to the daily observation of the oil leakage amount, which greatly reduces the work difficulty of the staff and makes the oil leakage point preventable and controllable; major safety hazards such as equipment fire are eliminated, the safety of personnel is guaranteed, the health level of the equipment is improved, and the long-term safe operation of the equipment is guaranteed. The indirect social benefits are huge, and it plays a good reference role for the oil leakage phenomenon in the middle box of the same type of units. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a push-pull rod sealing structure of a steam turbine according to the present invention;

[0012] Figure 2 It is a schematic diagram of a packing gland structure of a steam turbine push-pull rod sealing structure of the present invention;

[0013] Among them: 1. bearing box, 2. push-pull rod, 3. cooling sleeve, 4. inner oil baffle 1, 5. sealing ring, 6. packing, 7. packing gland, 71. ring, 72. bolt, 8. oil return pipe, 9. arc-shaped oil baffle, 10. inner oil baffle 2, 11. baffle reinforcement ring. DETAILED DESCRIPTION

[0014] The present invention is described clearly and completely below in conjunction with the accompanying drawings so that those skilled in the art can fully implement the present invention without having to make any creative work.

[0015] The specific implementation mode of the present invention is: Figure 1-2 As shown, a push-pull rod sealing structure of a steam turbine comprises a push-pull rod 2 arranged on a bearing box 1, a cooling sleeve 3 arranged on the push-pull rod 2, a sealing mechanism 1 between the cooling sleeve 3 and the push-pull rod 2, a sealing mechanism 2 between the push-pull rod 2 and the bearing box 1, and a sealing mechanism 3 inside the bearing box 1. The cooling sleeve 3 is provided with an oil return pipe 8, and the oil return pipe 8 opens downward and is connected to the bearing box 1, so as to ensure that the return oil will not spray upward when the unit is running, and the return oil flows into the bearing box 1 through the oil return pipe 8, thereby reducing the oil leakage of the push-pull rod 2. The sealing mechanism 1 comprises a sealing ring 5 and an inner oil baffle 1 4, which are arranged without gap between the push-pull rod 1 and the cooling sleeve 3. The sealing mechanism 2 comprises a sealing ring 5, a packing 6, and a packing gland 7. The sealing ring 5, the packing 6, and the packing gland 7 are arranged in sequence between the bearing box 1 and the push-pull rod 2 from the inside to the outside. The sealing mechanism 3 comprises a sealing ring 5 and an inner oil baffle 2 10 arranged at both ends of the push-pull rod 2 from the inside to the outside.

[0016] The present invention further provides an arc-shaped oil baffle 9 on the upper portion of the bearing box 1, which is arranged at the connection between the push-pull rod 2 and the bearing box 1 to further enhance the sealing performance and block the oil spraying to the push-pull rod 2, thereby reducing the probability of oil leakage.

[0017] In the present invention, the sealing mechanism three also includes a baffle reinforcement ring 11, which is made of stainless steel and is sleeved and fixed on the outside of the inner oil baffle two 10.

[0018] In the present invention, the packing 6 is a graphite nickel wire packing.

[0019] In the present invention, the packing gland 7 is composed of a circular ring 71 with an opening at one end and bolts 72 connecting the opening of the circular ring 71, so as to facilitate the adjustment of tightness.

[0020] The present invention further comprises a plurality of screws symmetrically arranged outside the push-pull rod 2 inside the bearing box 1 , and a mounting hole is arranged on the second inner oil stopper 10 , through which the screws pass to fix the second inner oil stopper 10 and the push-pull rod 2 .

[0021] According to the size of the push-pull rod 2, the present invention installs an inner oil baffle 4 between the cooling sleeve 1 and the sealing ring 5, and installs an arc-shaped oil baffle 9 on the upper part of the bearing box 1 to block the oil spraying to the push-pull rod 2, thereby having an oil blocking effect on the push-pull rod 2 in the axial and radial directions.

[0022] In the present invention, packing 6 is installed outside the push-pull rod 2 to further improve the sealing effect, and a packing gland 7 is made to compress the packing 6, which greatly reduces the amount of oil leakage.

[0023] The preferred embodiments of the present invention are described above. It should be pointed out that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any simple modifications, equivalent changes and modifications made to the above embodiments by any technician familiar with the art based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A steam turbine push-pull rod sealing structure, characterized in that: It includes a push-pull rod arranged on the bearing box, a cooling sleeve arranged on the push-pull rod, a sealing mechanism 1 between the cooling sleeve and the push-pull rod, a sealing mechanism 2 between the push-pull rod and the bearing box, and a sealing mechanism 3 in the bearing box, wherein the cooling sleeve is provided with an oil return pipe, the oil return pipe opening is downwardly connected to the bearing box, the sealing mechanism 1 includes a sealing ring and an inner oil stopper 1, which are arranged without gap between the push-pull rod and the cooling sleeve, the sealing mechanism 2 includes a sealing ring, a packing, and a packing gland, the sealing ring, the packing, and the packing gland are arranged in sequence from the inside to the outside between the bearing box and the push-pull rod, and the sealing mechanism 3 includes a sealing ring and an inner oil stopper 2 which are arranged at both ends of the push-pull rod from the inside to the outside; The upper part of the bearing box is also provided with an arc-shaped oil baffle, which is arranged at the connection between the push-pull rod and the bearing box to further enhance the sealing performance and block the oil spraying to the push-pull rod, thereby reducing the probability of oil leakage; The sealing mechanism 3 also includes a baffle reinforcement ring, which is made of stainless steel and is sleeved and fixed on the outside of the inner oil baffle 2; The packing is graphite nickel wire packing; The packing gland is composed of a ring with an opening at one end and bolts connecting the opening of the ring, which is convenient for adjusting the tightness; A plurality of screw rods are symmetrically arranged outside the push-pull rod inside the bearing box, and a mounting hole is arranged on the second inner oil stopper. The screw rods pass through the mounting hole to fix the second inner oil stopper and the push-pull rod.

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