Negative pressure steam extraction type steam leakage blocking device

Abstract

The utility model provides a negative pressure steam extraction type steam leakage blocking device, which relates to the technical field of steam turbine bearing box protection, and comprises an oil baffle, the oil baffle is arranged at the end part of a bearing box, an annular groove is arranged on the end surface of the oil baffle far away from the bearing box, a steam extraction opening is arranged on the periphery of the oil baffle, and the steam extraction opening is communicated to the annular groove. And a steam extraction opening of the oil shield is connected with negative pressure equipment. The annular groove is formed in the end face, far away from the bearing box, of the oil shield, and the steam extraction opening penetrates into the annular groove, so that negative pressure equipment creates a negative pressure environment in the annular groove through the steam extraction opening, and the negative pressure environment surrounds the bearing box and the position close to the outside of the main shaft; the inside of the bearing box and the spindle are not directly affected, so that leaked lubricating oil or spindle lubricating oil is not attracted while leaked steam is attracted, and loss of the lubricating oil is avoided. Therefore, the problem that leaked steam water enters the bearing box is solved, and long-term stable and good operation of a lubricating oil system is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of turbine bearing box protection, in particular to a negative pressure extraction type steam leakage blocking device. Background Art

[0002] At present, the mainstream turbine bearing box oil stopper is a comb-tooth type oil stopper, which mainly prevents internal oil from splashing out and external steam from leaking into the bearing box by adjusting the gap between the oil stopper and the main shaft of the turbine, so as to keep the lubricating oil clean and of high quality. As the turbine unit is running, the oil stopper gap becomes larger due to the vibration of the unit, and the poor operating conditions lead to steam leakage from the high and medium pressure cylinder shaft seals. Because the bearing box and the high and medium pressure cylinders are close to each other, steam leaks into the bearing box. Over time, the water content of the lubricating oil increases, resulting in changes in oil quality and poor lubrication ability, which brings great hidden dangers to the operation of the unit.

[0003] In the prior art, for example, Chinese patent CN210483825U disclosed on 2020-05-08, relates to a vacuum sealed oil baffle, which is connected to the comb tooth structure inside the oil baffle through an annular chamber. While maintaining a slight negative pressure in the annular chamber, it prevents the leakage of lubricating oil and steam from entering the bearing box, thereby solving the above-mentioned problem.

[0004] However, during use, since the annular chamber is connected to the spindle space in the oil baffle, although this type of prior art can attract steam to prevent it from entering the spindle box, it may also cause leakage of lubricating oil or the spindle lubricating oil to be attracted from the annular chamber, resulting in loss of lubricating oil. Utility Model Content

[0005] The purpose of the utility model is to provide a negative pressure extraction steam leakage barrier device, which can solve the problem of leaked steam moisture entering the bearing box and ensure the long-term stable and good operation of the lubricating oil system;

[0006] The utility model provides a negative pressure steam extraction type steam leakage isolation device, comprising an oil baffle, which is installed at the end of a bearing box, an annular groove is provided on the end surface of the oil baffle away from the bearing box, a steam extraction port is provided on the outer periphery of the oil baffle, the steam extraction port passes through the annular groove, and the steam extraction port of the oil baffle is connected to a negative pressure device.

[0007] Furthermore, the oil baffle is arranged between the high-pressure cylinder and the bearing box.

[0008] Furthermore, an oil baffle is arranged between the high-pressure cylinder and the bearing box, and its annular groove faces the high-pressure cylinder.

[0009] Furthermore, the oil baffle is also arranged between the medium-pressure cylinder and the bearing box.

[0010] Furthermore, an oil baffle arranged between the intermediate pressure cylinder and the bearing box has an annular groove facing the intermediate pressure cylinder.

[0011] Furthermore, a bearing box is provided between the high-pressure cylinder and the medium-pressure cylinder.

[0012] Furthermore, four steam extraction ports are evenly arranged on the outer periphery of the oil baffle, and the steam extraction ports are all connected to the negative pressure device.

[0013] Furthermore, the steam extraction port is connected to the negative pressure equipment through a steam extraction pipeline.

[0014] Furthermore, a valve is provided on one side of the steam suction port of the negative pressure device, and the steam extraction pipeline is connected to the valve.

[0015] Furthermore, the negative pressure equipment is an exhaust fan.

[0016] The technical solution of the utility model is to open an annular groove on the end face of the oil baffle away from the bearing box, and set a steam extraction port to pass through the annular groove, so the negative pressure device creates a negative pressure environment in the annular groove through the steam extraction port, and the negative pressure environment surrounds the bearing box and the outside of the main shaft, but due to the existence of the groove wall of the annular groove, it will not directly affect the inside of the bearing box and the main shaft, so while attracting leaked steam, it will not attract leaked lubricating oil or main shaft lubricating oil, avoiding lubricating oil loss. Thereby solving the problem of moisture in leaked steam entering the bearing box, and ensuring the long-term stable and good operation of the lubricating oil system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a front view of the oil baffle of the utility model;

[0019] Figure 2 This is a schematic diagram of the back side of the oil baffle of the utility model;

[0020] Figure 3 It is a cross-sectional schematic diagram of the oil baffle of the utility model;

[0021] Figure 4 This is a schematic diagram of the oil baffle arrangement of the utility model;

[0022] Description of reference numerals:

[0023] 1. Oil baffle; 101. Annular groove; 102. Steam extraction port; 2. Bearing box; 3. Negative pressure equipment; 4. High-pressure cylinder; 5. Medium-pressure cylinder; 6. Steam extraction pipeline; 7. Valve; DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Example 1

[0028] like Figure 1-Figure 4 As shown, the utility model provides a negative pressure steam extraction type steam leakage isolation device, including an oil baffle 1, which is installed at the end of a bearing box 2, and an annular groove 101 is provided on the end surface of the oil baffle 1 away from the bearing box 2, and a steam extraction port 102 is provided on the outer periphery of the oil baffle 1, and the steam extraction port 102 passes through the annular groove 101, and the steam extraction port 102 of the oil baffle 1 is connected to the negative pressure device 3.

[0029] Specifically, the oil baffle 1 is a rotary annular structure with a hole in the middle for the main shaft to pass through, and is installed at the port position of the bearing box 2. When the oil baffle 1 is installed on the bearing box 2, the end face away from the bearing box 2 faces the high-pressure cylinder 4 or the medium-pressure cylinder 5, and the annular groove 101 is opened on the end face. Since the negative pressure device 3 is connected to the annular groove 101 through the steam extraction port 102, the annular groove 101 is in a negative pressure environment. In fact, the entire annular groove 101 becomes a suction port. When the steam leaked from the shaft seal of the high-pressure cylinder 4 or the medium-pressure cylinder 5 comes to the front of the bearing box 2, it is sucked into the annular groove 101 and sucked out from the steam extraction port 102 and the negative pressure device 3, thereby solving the problem of moisture in the leaked steam entering the bearing box 2 and contaminating the lubricating oil.

[0030] Due to the existence of the groove wall of the annular groove 101, the negative pressure environment of the annular groove 101 is blocked by the groove wall and will not affect the inside of the bearing box 2 and the surface area of ​​the main shaft, so it will not attract leaked lubricating oil or main shaft lubricating oil, thereby avoiding the loss of lubricating oil and being able to keep the lubricating oil system running stably and well for a long time.

[0031] Example 2

[0032] The oil baffle 1 is arranged between the high-pressure cylinder 4 and the bearing box 2. The oil baffle 1 arranged between the high-pressure cylinder 4 and the bearing box 2 has its annular groove 101 facing the high-pressure cylinder 4. The oil baffle 1 is also arranged between the medium-pressure cylinder 5 and the bearing box 2. The oil baffle 1 arranged between the medium-pressure cylinder 5 and the bearing box 2 has its annular groove 101 facing the medium-pressure cylinder 5. The bearing box 2 is arranged between the high-pressure cylinder 4 and the medium-pressure cylinder 5.

[0033] Specifically, a bearing box 2 is provided on each side of the high-pressure cylinder 4, and a bearing box 2 is provided on each side of the medium-pressure cylinder 5, and the high-pressure cylinder 4 and the medium-pressure cylinder 5 share one bearing box 2. The bearing boxes 2 on both sides of the high-pressure cylinder 4 are provided with an oil baffle 1 on one side facing the high-pressure cylinder 4, and the annular groove 101 of the oil baffle 1 faces the high-pressure cylinder 4; similarly, the bearing boxes 2 on both sides of the medium-pressure cylinder 5 are provided with an oil baffle 1 on one side facing the medium-pressure cylinder 5, and the annular groove 101 of the oil baffle 1 faces the medium-pressure cylinder 5, so that no matter which side the steam leaks from, the high-pressure cylinder 4 and the medium-pressure cylinder 5 can be attracted by the negative pressure of the annular groove 101 on the oil baffle 1.

[0034] Example 3

[0035] Four steam extraction ports 102 are evenly arranged on the outer circumference of the oil baffle 1, and the steam extraction ports 102 are all connected to the negative pressure device 3. The steam extraction ports 102 are connected to the negative pressure device 3 through the steam extraction pipeline 6. A valve 7 is arranged on one side of the steam suction port of the negative pressure device 3, and the steam extraction pipeline 6 is connected to the valve 7. The negative pressure device 3 is an exhaust fan.

[0036] Specifically, four steam extraction ports 102 are evenly arranged on the oil baffle 1, so that a uniform negative pressure environment is formed in the entire annular groove 101, and the steam attracted into the annular groove 101 passes through the steam extraction ports 102 and the steam extraction pipe 6, and is discharged by the exhaust fan. The steam extraction pipe 6 is divided into a branch pipe and a main pipe, and each steam extraction port 102 is connected to a branch pipe respectively, and all the branch pipes are connected to a main pipe, which is connected to the steam suction port of the exhaust fan, and a valve 7 is arranged on the main pipe. By changing the opening of the valve 7, the negative pressure wind force applied by the exhaust fan in the annular groove 101 can be adjusted, and of course, it can also be achieved by adjusting the speed of the negative pressure fan.

[0037] Working mode and principle of this device:

[0038] The oil baffle 1 is installed at the port position of the bearing box 2, and its end face away from the bearing box 2 faces the high-pressure cylinder 4 or the medium-pressure cylinder 5. An annular groove 101 is opened on the end face. Since the negative pressure device 3 is connected to the annular groove 101 through the steam extraction port 102, the annular groove 101 is in a negative pressure environment. When the steam leaked from the shaft seal of the high-pressure cylinder 4 or the medium-pressure cylinder 5 comes to the front of the bearing box 2, it is sucked into the annular groove 101 and sucked out from the steam extraction port 102 and the negative pressure device 3, thereby solving the problem of moisture from the leaked steam entering the bearing box 2 and contaminating the lubricating oil.

[0039] Due to the existence of the groove wall of the annular groove 101, the negative pressure environment of the annular groove 101 is blocked by the groove wall and will not affect the inside of the bearing box 2 and the surface area of ​​the main shaft, so it will not attract leaked lubricating oil or main shaft lubricating oil, thereby avoiding the loss of lubricating oil and being able to keep the lubricating oil system running stably and well for a long time.

[0040] The device has reliable operation and low cost and can be widely used in large and medium-sized steam turbine generator sets.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A negative pressure steam extraction type steam leakage barrier device, characterized in that: It includes an oil baffle, which is installed at the end of the bearing box. An annular groove is provided on the end surface of the oil baffle away from the bearing box. A steam extraction port is provided on the outer periphery of the oil baffle. The steam extraction port passes through the annular groove. The steam extraction port of the oil baffle is connected to a negative pressure device.

2. The negative pressure steam extraction type steam leakage barrier device according to claim 1, characterized in that: The oil baffle is arranged between the high-pressure cylinder and the bearing box.

3. The negative pressure steam extraction type steam leakage barrier device according to claim 2, characterized in that: The oil baffle is arranged between the high-pressure cylinder and the bearing box, and its annular groove faces the high-pressure cylinder.

4. The negative pressure steam extraction type steam leakage barrier device according to claim 3, characterized in that: The oil baffle is also arranged between the medium pressure cylinder and the bearing box.

5. The negative pressure steam extraction type steam leakage barrier device according to claim 4, characterized in that: The oil baffle is arranged between the intermediate pressure cylinder and the bearing box, and its annular groove faces the intermediate pressure cylinder.

6. The negative pressure steam extraction type steam leakage barrier device according to claim 5, characterized in that: A bearing box is provided between the high-pressure cylinder and the medium-pressure cylinder.

7. The negative pressure steam extraction type steam leakage barrier device according to claim 1, characterized in that: Four steam extraction ports are evenly arranged on the outer circumference of the oil baffle, and the steam extraction ports are all connected to the negative pressure equipment.

8. The negative pressure steam extraction type steam leakage barrier device according to claim 7, characterized in that: The steam extraction port is connected to the negative pressure equipment through a steam extraction pipeline.

9. The negative pressure steam extraction type steam leakage barrier device according to claim 8, characterized in that: A valve is provided on one side of the steam suction port of the negative pressure device, and the steam extraction pipeline is connected to the valve.

10. The negative pressure steam extraction type steam leakage barrier device according to claim 9, characterized in that: The negative pressure equipment is an exhaust fan.

Images