Coupling cover oil seepage and oil leakage prevention device

Abstract

To provide a coupling cover oil seepage and oil leakage prevention device. [Solution] The device is installed in a water pump coupling cover 3 between the front box 1 of a small steam turbine and a steam-driven feedwater pump 2, and includes an oil return pipe 4, which is connected to an oil tank 5, and a smoke exhaust fan 6 is installed in the oil tank.

Description

[Technical field]

[0001] The present invention relates to the technical field of steam turbines, and in particular to an oil seepage and oil leakage prevention device for a coupling cover. [Background technology]

[0002] At present, the front box of the small steam turbine and the coupling cover of the steam-driven feed water pump are connected together, so that the pressure of the lubricating oil of the small steam turbine causes the oil gas to splash from the front box into the coupling cover of the feed water pump, and the high-speed rotation of the coupling causes it to be pressurized and ejected inside the cover, resulting in oil seepage and leakage. The traditional treatment method is to tighten the screws of the cover and apply sealant to the joint. Considering the problems of oil gas penetration in the sealing part, sealant aging, loosening of screws and other problems, it is impossible to fundamentally solve the problem of oil seepage and leakage, and it is necessary to strengthen regular observation and timely sealing to deal with it. Summary of the Invention [Means for solving the problem]

[0003] The purpose of this invention is to provide an oil seepage and oil leakage prevention device for the coupling cover, so as to increase the conduction path of oil and gas, thereby reducing the problem of oil seepage and leakage from the coupling cover. By adding an oil return pipe under the coupling, the oil and gas in the cover can be discharged through the oil return pipe by using the suction negative pressure of the smoke exhaust fan, avoiding leakage from the gap of the device due to excessive pressure.

[0004] The objective of the present invention may be achieved by the following technical solutions:

[0005] An oil seepage and oil leakage prevention device for a coupling cover is provided on a water pump coupling cover between a front box of a small steam turbine and a steam-driven feed water pump, the device includes an oil return pipe provided on the water pump coupling cover, the oil return pipe is connected to an oil tank, and a smoke exhaust fan is provided in the oil tank.

[0006] Furthermore, the oil return pipe is connected to the main oil return pipe of the oil tank.

[0007] Furthermore, the oil return pipe is connected to a main oil return pipe via a flange.

[0008] Furthermore, the oil return main pipe is of size DN50.

[0009] Furthermore, the oil return pipe includes an L-shaped pipe, a joint of the water pump coupling cover, and a joint of the main oil return pipe.

[0010] Furthermore, the joint of the water pump coupling cover is welded to the water pump coupling cover.

[0011] Furthermore, the joint of the main oil return pipe is welded to the main oil return pipe.

[0012] Furthermore, one end of the L-shaped pipe is connected to a joint of the water pump coupling cover via a flange, and the other end is connected to a joint of the main oil return pipe via a flange.

[0013] Furthermore, the joint of the water pump coupling cover and the portion of the L-shaped pipe connected to the joint of the water pump coupling cover are perpendicular to the horizontal plane.

[0014] Furthermore, the joint of the main oil return pipe and the portion of the L-shaped pipe connected to the joint of the main oil return pipe are parallel to a horizontal plane.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In this invention, a DN50 oil return pipe is added under the coupling and discharged into the main oil return pipe of the small steam turbine, and is connected by a flange. By adding an oil return pipe under the coupling, the oil gas in the cover is discharged from the oil return pipe by utilizing the suction negative pressure of the smoke exhaust fan, avoiding leakage from the gaps of the device due to excessive pressure.

Brief Description of the Drawings

[0017] [Figure 1] Figure 1 is a schematic structural diagram of this invention.

Explanation of Reference Signs

[0018] 1. Front box of small steam turbine; 2. Steam-driven feed water pump; 3. Water pump coupling cover; 4. Oil return pipe; 5. Oil tank; 6. Smoke exhaust fan; 51. Main oil return pipe; 41. L-shaped pipe; 42. Joint of water pump coupling cover; 43. Joint of main oil return pipe.

Embodiments for Carrying out the Invention

[0019] Hereinafter, this invention will be described in detail in conjunction with the attached drawings and specific embodiments. This embodiment is implemented based on the technical solution of this invention, providing a detailed embodiment and specific operation process, but the protection scope of this invention is not limited to the following embodiments.

[0020] It should be noted that in the following figures, the same numbers and letters represent the same items. Once an item is defined in a figure, no further definition and explanation are required in subsequent figures.

[0021] Hereinafter, some embodiments of this invention will be described in detail in conjunction with the attached drawings. The following embodiments and the features in the embodiments may be combined with each other without contradiction.

Embodiment

[0022] At present, the front box of the small steam turbine and the coupling cover of the steam-driven feed water pump are connected together, and the lubricating oil pressure of the small steam turbine is generally 0.3Mpa, so the oil gas will splash from the front box into the coupling cover of the feed water pump, and due to the high-speed rotation of the coupling, it will be pressurized and sprayed out in the cover, and there will always be oil seepage and leakage problems. The traditional treatment method is to tighten the screws of the cover and apply sealant to the joint. Considering the problems of oil gas penetration in the sealing part, sealant aging, loosening of screws and other problems, it is impossible to fundamentally solve the problem of oil seepage and leakage, and it is necessary to strengthen regular observation and timely sealing to deal with it.

[0023] In order to increase the conduction path of oil and gas, and thereby reduce the problem of oil seepage and leakage of the coupling cover, the present invention provides an oil seepage and oil leakage prevention device for the coupling cover, the structure diagram of which is shown in Figure 1. The device is installed on the water pump coupling cover 3 between the front box 1 of the small steam turbine and the steam-driven feed water pump 2, and the device includes an oil return pipe 4 installed on the water pump coupling cover 3, the oil return pipe 4 is connected to an oil tank 5, and the oil tank 5 is equipped with a smoke exhaust fan 6. The present invention adds an oil return pipe of DN50 under the coupling, which discharges into the oil return main pipe of the small steam turbine and connects with a flange, and adds an oil return pipe under the coupling, so that the oil and gas in the cover can be discharged from the oil return pipe by using the suction negative pressure of the smoke exhaust fan, and avoids leakage from the gap of the device due to excessive pressure.

[0024] The oil return pipe 4 is connected to a main oil return pipe 51 of an oil tank 5 .

[0025] The oil return pipe 4 is connected to a main oil return pipe 51 via a flange.

[0026] The oil return main pipe 51 has a size of DN50.

[0027] The oil return pipe 4 includes an L-shaped pipe 41, a joint 42 of the water pump coupling cover, and a joint 43 of the main oil return pipe.

[0028] The water pump coupling cover joint 42 is welded to the water pump coupling cover 3 .

[0029] The main oil return pipe joint 43 is welded to the main oil return pipe 51 .

[0030] One end of the L-shaped pipe 41 is connected to a joint 42 of the water pump coupling cover via a flange, and the other end is connected to a joint 43 of the main oil return pipe via a flange.

[0031] The joint 42 of the water pump coupling cover and the portion of the L-shaped pipe 41 connected to the joint 42 of the water pump coupling cover are perpendicular to the horizontal plane.

[0032] The joint 43 of the main oil return pipe and the portion of the L-shaped pipe 41 connected to the joint 43 of the main oil return pipe are parallel to the horizontal plane.

[0033] This invention adds a DN50 oil return pipe under the coupling to discharge into the main oil return pipe of the small steam turbine, and connects it with a flange to facilitate subsequent modification of the piping structure. This invention increases the oil and gas conduction path, thereby reducing the pressure in the gap of the equipment and preventing the infiltration of oil and gas.

[0034] By adopting this invention, oil seepage and leakage can be prevented. After adding an oil return pipe under the coupling, the oil gas in the cover can be discharged through the oil return pipe by using the negative suction pressure of the smoke exhaust fan, thereby avoiding leakage from the gaps in the equipment due to excessive pressure.

[0035] When the present invention is working, the coupling rotates at high speed, and at this time the smoke exhaust fan works to convert the pressure state of the oil tank into negative pressure. At this time, the oil gas in the cover passes through the installed oil return pipe 4 and enters the oil tank 5 through the main oil return pipe 51, so that the oil gas in the cover is discharged from the oil return pipe by using the suction negative pressure of the smoke exhaust fan, reducing the pressure in the coupling cover and preventing oil seepage and leakage.

[0036] In the present invention, the size of the oil return pipe is not limited to DN50, but may be other sizes.

[0037] The L-shaped pipe of the oil return pipe of the present invention is advantageous for quickly sucking out the oil gas from the coupling cover, so as to reduce the pressure of the coupling cover more quickly during operation, and then cooperate with the oil gas generated in the front box 1 of the small steam turbine to quickly suck out the oil gas generated in the front box 1 of the small steam turbine that has entered the coupling cover.

[0038] The above is a detailed description of the preferred specific embodiments of the present invention. It should be understood that those skilled in the art can make many modifications and changes based on the concept of the present invention without creative efforts. Therefore, any technical solution that those skilled in the art can obtain based on the concept of the present invention and on the prior art through logical analysis, reasoning, or limited experimentation should be within the scope of protection determined by the claims.

Claims

1. An oil seepage and oil leakage prevention device for a coupling cover, which is installed on a water pump coupling cover (3) between a front box (1) of a small steam turbine and a steam-driven feed water pump (2), the device includes an oil return pipe (4) installed on the water pump coupling cover (3), the oil return pipe (4) is connected to an oil tank (5), and the oil tank (5) is provided with a smoke exhaust fan (6).

2. 2. The coupling cover oil seepage and oil leakage prevention device according to claim 1, characterized in that the oil return pipe (4) is connected to a main oil return pipe (51) of an oil tank (5).

3. 3. The coupling cover oil seepage and oil leakage prevention device according to claim 2, wherein the oil return pipe (4) is connected to a main oil return pipe (51) via a flange.

4. The coupling cover oil seepage and oil leakage prevention device according to claim 2, characterized in that the size of the oil return main pipe (51) is DN50.

5. The coupling cover oil seepage and oil leakage prevention device according to claim 2, characterized in that the oil return pipe (4) includes an L-shaped pipe (41), a joint (42) of the water pump coupling cover, and a joint (43) of the main oil return pipe.

6. The coupling cover oil seepage and oil leakage prevention device according to claim 5, characterized in that the joint (42) of the water pump coupling cover is welded to the water pump coupling cover (3).

7. The coupling cover oil seepage and oil leakage prevention device according to claim 6, characterized in that the joint (43) of the main oil return pipe is welded to the main oil return pipe (51).

8. The coupling cover oil seepage and oil leakage prevention device according to claim 7, characterized in that one end of the L-shaped pipe (41) is connected to a joint (42) of the water pump coupling cover via a flange, and the other end is connected to a joint (43) of the main oil return pipe via a flange.

9. The coupling cover oil seepage and oil leakage prevention device as described in claim 8, characterized in that the joint (42) of the water pump coupling cover and the portion of the L-shaped pipe (41) connected to the joint (42) of the water pump coupling cover are perpendicular to the horizontal plane.

10. The coupling cover oil seepage and oil leakage prevention device as described in claim 9, characterized in that the joint (43) of the main oil return pipe and the portion of the L-shaped pipe (41) connected to the joint (43) of the main oil return pipe are parallel to a horizontal plane.

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