Dustproof oil seal device for oil tank of steam turbine

Abstract

The utility model relates to a dustproof oil seal device for a steam turbine oil tank and belongs to the field of steam turbine devices. Comprising a U-shaped bent pipe, an oil injection valve and a glass window, one section of the overflow main pipe is connected with the top of the side face of the steam turbine oil tank, the other section of the overflow main pipe is connected with the accident oil pool, the U-shaped bent pipe is connected between the two overflow main pipes, the oil injection valve is arranged on the pipe wall of the upper portion of the U-shaped bent pipe, and the glass window is arranged on the U-shaped bent pipe below the oil injection valve. The device is simple and practical in structure and extremely low in cost, and effectively solves the problem of lubricating oil pollution of the steam turbine.

Description

Technical Field

[0001] The utility model relates to a dustproof oil seal device for a steam turbine oil box, belonging to the field of steam turbine devices. Background Art

[0002] When a steam turbine's oil tank is full, it primarily overflows through an overflow pipe and drains to a designated location, such as an emergency oil sump. Because the tank pressure is low, the overflow pipe is typically left open and vented to the atmosphere, allowing the lubricating oil to flow by gravity into the emergency oil sump. However, during turbine operation, the exhaust fan often creates a slight negative pressure within the tank, allowing the oil used to cool the unit's bearings to flow smoothly back into the tank. At this point, the overflow pipe, which is vented to the atmosphere, can draw dust from the atmosphere into the tank, contaminating the lubricating oil over time.

[0003] If a spring-loaded check valve is installed on the oil tank overflow pipe, the selection of the spring force is more demanding. Considering the resistance of the static pressure of the lubricating oil in the oil tank, it is often difficult to ensure its smooth overflow. If a swing check valve is installed, because there is no working fluid pressure on the sealing surface, its sealing effect is often no different from that of an open pipe to the atmosphere, and there is still a risk of dust inhalation. Utility Model Content

[0004] According to the background problem, the problem to be solved by the present invention is:

[0005] The turbine oil tank is at a slight negative pressure, and the overflow pipe connected to the atmosphere will draw dust in the atmosphere into the oil tank, which will cause contamination of the lubricating oil over a long period of time.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A dustproof oil seal device for a steam turbine oil tank comprises a U-shaped bend pipe, an oil filling valve and a glass window; one section of an overflow main pipe is connected to the top of the side of the steam turbine oil tank, and the other section is connected to an emergency oil pool; the U-shaped bend pipe is connected between the two sections of the overflow main pipe; the oil filling valve is provided on the upper pipe wall of the U-shaped bend pipe; and the glass window is arranged on the U-shaped bend pipe below the oil filling valve.

[0008] Preferably, the length of the vertical pipe section of the U-shaped bend is determined according to the designed negative pressure of the turbine oil tank.

[0009] Preferably, the diameter of the U-shaped bend pipe is the same as that of the overflow main pipe.

[0010] This utility model isolates the turbine oil tank from air by offsetting the upward negative pressure suction force through the downward deadweight of the sealing oil. The longer the vertical pipe section of the U-bend, the more sealing oil can be added to the same pipe diameter. The required gravity of the sealing oil is calculated based on the designed negative pressure suction force of the turbine oil tank, and the bottom of the U-bend is ensured to be full to prevent air leakage. The liquid level difference between the vertical pipe sections on both sides of the U-bend should provide a gravity equal to the suction force, and the length of the vertical pipe section of the U-bend is determined accordingly. The glass window is determined based on the designed sealing oil column height to ensure that the top surface of the sealing oil column can be seen through the glass window.

[0011] The beneficial effects of the utility model are:

[0012] The utility model has a simple and practical structure, extremely low cost, and effectively solves the problem of lubricating oil pollution in steam turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the dustproof oil seal device for the turbine oil tank

[0014] In the figure: 1 is the turbine oil tank; 2 is the overflow main; 3 is the emergency oil pool; 4 is the U-shaped bend pipe; 5 is the glass window; 6 is the oil filling valve. DETAILED DESCRIPTION

[0015] Example 1

[0016] A dustproof oil seal device for a steam turbine oil tank comprises a U-shaped bend pipe 4, an oil filling valve 6 and a glass window 5; one section of an overflow main pipe 2 is connected to the top of the side of a steam turbine oil tank 1, and the other section is connected to an emergency oil pool 3; the U-shaped bend pipe 4 is connected between the two sections of the overflow main pipe 2; the oil filling valve 6 is provided on the upper pipe wall of the U-shaped bend pipe 4; and the glass window 5 is arranged on the U-shaped bend pipe 4 below the oil filling valve 6.

[0017] The length of the vertical pipe section of the U-shaped bend pipe 4 is determined according to the designed negative pressure of the steam turbine oil tank 1 .

[0018] The diameter of the U-shaped bend pipe 4 is the same as that of the overflow main pipe 2.

[0019] Open the oil filling valve 6, add sealing oil to the U-shaped bend 4 through the oil pot, add until the oil level in the U-shaped bend 4 reaches the middle of the glass window 5, close the oil filling valve 6, observe the changes in the liquid level in the U-shaped bend 4, and then add an appropriate amount of sealing oil according to the changes.

Claims

1. A dustproof oil seal device for a steam turbine oil tank, characterized in that: The invention comprises a U-shaped bend pipe (4), an oil filling valve (6) and a glass window (5); one section of the overflow main pipe (2) is connected to the top of the side of the turbine oil tank (1), and the other section is connected to the accident oil pool (3); the U-shaped bend pipe (4) is connected between the two sections of the overflow main pipe (2); the upper pipe wall of the U-shaped bend pipe (4) is provided with an oil filling valve (6); and the glass window (5) is arranged on the U-shaped bend pipe (4) below the oil filling valve (6).

2. A dustproof oil seal device for a steam turbine oil tank according to claim 1, characterized in that: The length of the vertical pipe section of the U-shaped bend pipe (4) is determined according to the designed negative pressure of the steam turbine oil tank (1).

3. The dustproof oil seal device for a steam turbine oil tank according to claim 1, characterized in that: The diameter of the U-shaped elbow (4) is the same as that of the overflow main pipe (2).

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