JPH0988509A - Oil mist scavenging device of bearing box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase separation and scavenging capacities of oil mist in exhaust air in a bearing box of a bearing lubrication device which lubricates and cools a bearing of a rotary shaft of a steam turbine and a generator. SOLUTION: A cooling plate 15a which is fixed in a fixing section 16 and has a wave-shaped cross section is provided in an internal space of a repressing chamber 12c which is provided by communicating with exhaust pipes 10a and 10b of a flow passage of exhaust air 13 which is sent from a bearing box through an oil tank to bring the exhaust air 13 into contact with the cooling plate 15a and cool and condensate it so that separation and scavenging capacities of oil mist in the exhaust air 13 are increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention separates and collects lubricating oil mist in a bearing box of a bearing lubricating oil device for lubricating and cooling the bearings of rotary shafts of steam turbines and generators, and the like. The present invention relates to an oil mist collecting device that discharges the above gas to the outdoors.

[0002]

2. Description of the Related Art FIGS. 5 and 6 are explanatory views of a bearing lubricating oil device for a steam turbine. FIG. 5 is a system diagram of the bearing lubricating device, and FIG. 6 shows a lubricating oil mist sent to an oil tank. It is a principal part block diagram of the collection apparatus of the lubricating oil mist of the exhaust containing.
The bearing lubricating oil device for the bearings of the steam turbine and the generator, as in the turbine shown in FIG. 5, sends the lubricating oil in the oil tank 1 to the cooler 3 by the oil supply pump 2 to cool it, and then the oil supply pipe 4 Is supplied to the bearing 6 housed in the bearing box 5, the bearing 6 is lubricated and cooled, then discharged to the bearing box 5, and returned to the bearing box 5 via a return oil pipe 8 to communicate with the oil tank 1 It is configured to be sent to. In order to prevent the lubricating oil from leaking from the boundary surface between the bearing box 5 and the axle 7, the bearing box 5 has a space inside the return oil pipe 8 for sending the exhaust gas in the bearing box 5 to the lubricating oil. A suction fan 9 sucks the oil into the oil tank 1 to generate a negative pressure. The exhaust gas in the bearing box 5 including the outside air sucked from the boundary surface between the bearing box 5 and the axle 7 is exhausted to the outside through the exhaust pipe 10.

The exhaust gas in the bearing box 5 is composed of air containing mist-like lubricating oil mist (hereinafter referred to as oil mist) diffused by the rotation of the bearing 6, and the exhaust gas in the bearing box 5 is discharged. At this time, it is necessary to separate and collect this oil mist. This oil mist forms extremely fine particles, and a part of the oil mist is in the form of gas, and separation and collection thereof are difficult. As a method for collecting and separating the oil mist in the exhaust gas, a method of passing a filter consisting of a screen and paper and a method of applying an electric dust mist principle to electrically charge the oil mist are also implemented. Although the former is temporarily effective, the pressure drop when the filter is clogged may make stable and continuous operation difficult. In addition, the latter requires large-scale equipment,
There is a problem that maintenance and other costs are expensive.

Therefore, as shown in FIG. 6, the exhaust pipe including the oil mist sent from the oil tank 1 is exhausted through the exhaust pipe 10 as a device that does not require clogging of the collecting device or maintenance management. The method of separating and collecting the oil mist by the oil mist collecting device 11 connected to is practically used. The specific example is shown in FIG. 7, and the oil mist collecting device 11 a includes the exhaust pipe 10
A closed cylindrical sedation chamber 12 having a larger cross-sectional area than a and 10b
a, and an exhaust pipe 10a from the oil tank 1 is communicatively connected to a wall surface below the calming chamber 12a.
The flow velocity of the exhaust gas 13 containing the oil mist sent from a is dropped in the settling chamber 12a and brought into contact with the wall surface to cool and condense the oil mist, which is separated from the air by gravity and the collected oil is drained. Exhausted from the air
The exhaust pipe 10b provided at the upper end of a discharges the air to the outside. Further, as a method for separating and collecting the oil mist by the aforementioned calming chamber, the cyclone type oil mist collecting device 11b shown in FIG. 8 can be considered. That is, from the upper part of the calming chamber 12b shown in (1) of FIG. 8 to the exhaust pipe 10a,
As shown in the cross-sectional view of (2), the exhaust mist is provided along the circumferential direction of the wall surface to condense and separate the oil mist while rotating the inner peripheral surface of the calming chamber 12b, and the air is stored inside the calming chamber 12b. It is discharged from the discharge port of the pipe 10b, and it has the advantage that it is composed of a simple device as described above and does not require maintenance and management of the device.

[0005]

However, in the oil mist collecting device 11 shown in FIG. 6 described above, in the structure of the calming chamber 12a shown in FIG. 7, the collecting performance of the oil mist of the exhaust 13 is not sufficient. Exhaust gas discharged from the air discharge port of the exhaust pipe 10b comes into contact with the atmosphere and is rapidly cooled to generate an oil mist that has not been separated and collected, and the wall surface 21 around the discharge port is generated.
There is a problem that it may pollute. Also in the structure of FIG. 8, the pressure loss on the wall surface of the calming chamber 12b is large, and the effect of separating fine oil mist is poor, and there is a problem that must be taken in practical use.

An object of the present invention is to solve the above problems and to improve the ability of separating and collecting the oil mist of the exhaust gas in the bearing housing of the bearing lubricating oil system for lubricating and cooling the bearings of the rotating shafts of steam turbines and generators. It is an object of the present invention to provide an oil mist collecting device which is an improved and simple device and does not require maintenance.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to the inside of a sedation chamber constituting an oil mist collecting device connected to an exhaust pipe provided in an oil tank.
A cooling plate extending axially along the flow path of the oil mist is provided so as to be partially adhered and fixed on the circumference of the inner wall portion of the calming chamber. As a result, the exhaust gas containing the oil mist sent from the exhaust pipe into the calming chamber contacts the cooling plate inside the calming chamber, is cooled, condenses the oil mist and promotes liquefaction, and the oil that adheres to the cooling plate The collection efficiency can be improved by increasing the viscosity of the mist. Further, by providing a heat radiating plate on the outer periphery of the calming chamber having the cooling plate housed therein, the cooling efficiency of the cooling plate can be further improved.

Furthermore, by making the oil mist collecting device a calming chamber having a corrugated wall surface extending in the axial direction which protrudes from the outer peripheral surface of the exhaust pipe, the contact area of the wall surface with the outside air increases and the oil flowing through the calming chamber is increased. The cooling effect of the mist can be enhanced, and in this case, by providing the cooling pipe in the corrugated wall surface, the collecting effect of the lubricating oil mist can be further improved.

Further, the exhaust gas is sent from the upper part of the sedation chamber so that the direction of the flow of the exhaust gas containing the oil mist from the oil tank and the direction in which the condensed oil mist flows and is discharged coincide with each other. The structure that discharges the air separated from the oil mist from the exhaust port of the exhaust pipe that opens at the bottom promotes the discharge of condensed oil mist from the drain and prevents the mist from re-separating. You can

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 shows a structure of a calming chamber which constitutes an oil mist collecting device according to a first embodiment of the present invention. (1) is a longitudinal sectional view, (2) is (1) FIG. 3 is an I-I arrow view of FIG. Exhaust pipes 10a, 1 reaching the outside from the exhaust fan 9 of the oil tank 1
0b (FIG. 6), the cooling plate 15a is provided along the flow path of the exhaust gas 13 containing the oil mist inside the calming chamber 12c that constitutes the oil mist collecting device 11c. There is. In order to increase the contact area with the exhaust gas 13, the shape of the cooling plate 15a is such that the cooling plate 15a has a corrugated cross section and projects into the inner space of the calming chamber 12c. It is configured to ensure heat transfer to the calming chamber 12c of the cooling plate 15a by closely fixing them.

The exhaust 13 sent from the exhaust pipe 11a is
Cooling from the bottom of the calming chamber 12c upwards by the inner wall surface of the calming chamber 12c and the cooling plate 15a lowers the vapor pressure of the oil to promote the change from the gas body to the mist state, and at the same time, the inner wall surface of the calming chamber 12c. Also, the oil mist attached to the cooling plate 15a is condensed, the viscosity is increased, and the liquefied lubricating oil is discharged from the drain 14 below. As a result, the oil mist of the exhaust 13 is collected by both the inner wall surface of the calming chamber 12c and the cooling plate 15a, so that the oil mist in the air separated from the exhaust 13 discharged to the outside can be removed.

Embodiment 2 FIG. 2 shows the structure of a sedation chamber which constitutes an oil mist collecting device showing a second embodiment of the present invention. (1) is a longitudinal sectional view and (2) is It is a II-II arrow line view of (1). In this embodiment, a heat radiating plate is provided in order to improve the cooling performance of the calming chamber and the cooling plate in the first embodiment. That is, as shown in FIG. 2, the cooling plate 15b inside the calming chamber 12d is referred to as a plate, and is provided radially through the outer wall of the calming chamber 12d, and the portion projecting to the outside serves as the heat radiating plate 17b. It is an integrated structure with. By providing the heat dissipation plate 17, the cooling efficiency of the cooling plate 15b and the wall surfaces of the calming chamber 12d can be increased, and the collection performance of the oil mist is further improved. Further, in this embodiment, the cooling plate 15b and the heat radiating plate 17 have an integrated structure, but the same effect can be obtained by providing the heat radiating plate 17 on the outer wall surface of the calming chamber 12d separately from the cooling plate 15b. .

Third Embodiment FIG. 3 shows the structure of a calming chamber which constitutes an oil mist collecting device according to a third embodiment of the present invention. (1) is a longitudinal sectional view and (2) is It is a III-III arrow line view of (1). In the structure of the calming chamber 12e of this embodiment, the cooling plate 15c is common to the outer wall of the calming chamber 12e, and a part of the outer wall of the calming chamber 12e projects from the outer peripheral surface and extends in the axial direction. Both ends are used as the wall surface of the end plate 18
It is supported by a and 18a. The end plates 18a, 18a are used to cool the cooling plate 15 in the axial direction of the calming chamber 12e.
In c, the opening portion of the outer peripheral portion facing the outside air is sealed. A plurality of cooling pipes 20a having openings 19a on the end plates 18a and 18a are provided in the space formed in the axial direction by being surrounded by the corrugated cooling plate 15c inside the calming chamber 12e. .

As described above, the cooling plate 15c is attached to the calming chamber 12e.
By having a corrugated configuration that doubles as the outer wall surface of
The heat transfer efficiency can be improved by increasing the cooling area of the cooling plate 15c that contacts the exhaust gas 13. Further, as shown in this embodiment, by providing a plurality of cooling pipes 20a in the flow path of the exhaust 13, the contact area with the exhaust 13 is further increased, the exhaust 13 is cooled, and the condensed oil mist is supplemented. It is possible to improve the collection performance.

Fourth Embodiment FIG. 4 shows the structure of a calming chamber which constitutes an oil mist collecting device according to a fourth embodiment of the present invention. (1) is a longitudinal sectional view and (2) is It is a VI-VI arrow view of (1). In this embodiment, the calming chamber 12f is provided on the outer circumference of the exhaust pipe 10d, and the exhaust 13 containing the oil mist sent from the oil tank 1 (FIG. 6) is sent from the upper part of the calming chamber 12f. The air from which the oil mist has been separated from the exhaust 13 is exhausted from the exhaust port of the exhaust pipe 10d located below the sedation chamber 12f. As the cooling plate 15d for separating the oil mist, as shown in FIG. 3 of the third embodiment, the cooling plate 15d formed in a wavy shape extending in the axial direction is radially installed inside the calming chamber 12f. A plurality of cooling pipes 20b are supported in a space surrounded by the cooling plate 15d by end plates 18b, 18b having openings 19b at both ends thereof. As a result, the cooling efficiency of the oil mist is improved, and the direction of the exhaust gas flowing through the cooling pipe 20a and the cooling pipe 2
Since the direction in which the oil mist condensed and liquefied at 0a flows is the same, there is an effect of promoting the discharge capability of oil mistakes.

[0016]

As described above, in the present invention, the oil tank is provided with the structure of the oil mist collecting device for separating and collecting the oil mist in the exhaust gas of the bearing box and discharging the air in the exhaust air to the outside. The cooling plate is installed inside the calming chamber that communicates with the exhaust pipe.The exhaust gas containing the oil mist sent from the exhaust pipe into the calming chamber contacts the cooling plate inside the calming chamber and condenses. Liquefaction is promoted, and the viscosity of the lubricating oil mist adhering to the cooling plate can be increased and collected, so compared with the conventional oil mist separating device using only a calming chamber, It is possible to improve the collection efficiency of oil mist

Further, a heat dissipation plate may be provided on the outer wall of the calming chamber,
The cooling performance of the cooling plate can be improved by forming the cooling plate into a corrugated shape having an uneven surface.
Further, by providing a plurality of cooling pipes in the space formed by the cooling plate of the exhaust gas passage in the calming chamber to increase the cooling area, the efficiency of collecting the oil mist of the exhaust gas can be further increased. Therefore, according to the present invention, it is possible to discharge the air containing no oil mist to the outside in the calming chamber of the oil mist collecting device, so that environmental pollution such as soiling the outdoor wall surface by the oil mist can be prevented. It is possible to provide an oil mist collecting device that is inexpensive and does not require maintenance management at low cost.

[Brief description of drawings]

FIG. 1 shows a structure of a sedation chamber which constitutes an oil mist collecting device according to a first embodiment of the present invention, wherein (1) is a longitudinal sectional view and (2) is I- of (1). FIG.

FIG. 2 shows a structure of a sedation chamber which constitutes an oil mist collecting device according to a second embodiment of the present invention, wherein (1) is a longitudinal sectional view and (2) is II- of (1). It is a II arrow view.

FIG. 3 shows a structure of a sedation chamber which constitutes an oil mist collecting device according to a third embodiment of the present invention, wherein (1) is a longitudinal sectional view and (2) is III- of (1). It is a III arrow view.

FIG. 4 shows a structure of a sedation chamber which constitutes an oil mist collecting device according to a fourth embodiment of the present invention, wherein (1) is a longitudinal sectional view and (2) is VI-of (1). It is a VI arrow view.

FIG. 5 is a system diagram of a bearing lubricating oil device of a steam turbine.

FIG. 6 is a configuration diagram of a main part of a conventional oil mist collecting device.

FIG. 7 is a structural diagram of a calming chamber that constitutes a conventional oil mist collecting device.

FIG. 8 is a structural diagram of a calming chamber which is different from that of FIG. 7 which constitutes the conventional oil mist collecting device, in which (1) is a longitudinal sectional view and (2).
FIG. 8 is a view taken along line VIII-VIII of (1).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil tank 5 Bearing box 6 Bearing 10 Exhaust pipe 10a Exhaust pipe 10b Exhaust pipe 10c Exhaust pipe 10d Exhaust pipe 11 Oil mist collector 12 Sedative chamber 12c Sedative chamber 12d Sedative chamber 12e Sedative chamber 12f Stable chamber 15a Cooling plate 15b 15c Cooling plate 15d Cooling plate 16 Fixing part 17 Radiating plate 18a End plate 18b End plate 19a Opening 19b Opening 20a Cooling pipe 20b Cooling pipe

Claims (5)

[Claims] 1. Lubricating oil in the bearing box of a bearing lubricating oil device, which circulates lubricating oil from an oil tank in a bearing box that houses bearings of a rotating shaft of a turbine and a generator, and oil generated in the bearing box. Exhaust gas containing mist is sent to an oil tank, and the oil mist collecting device is separated and collected by an oil mist collecting device connected to an exhaust pipe provided in this oil tank to collect gas in the bearing box. In an oil mist collector for discharging outdoors, the oil mist collector comprises a calming chamber having a larger cross-sectional area than an exhaust pipe, and a cooling plate extending axially along the flow path of the oil mist inside the calming chamber. An oil mist collecting device for a bearing box, wherein the oil mist collecting device is provided so as to be partially adhered and fixed on the circumference of the inner wall portion of the sedation chamber. 2. The oil mist collecting device for a bearing box according to claim 1, wherein a heat dissipation plate is provided on the outer circumference of the calming chamber. 3. Lubricating oil in the bearing box of a bearing lubricating oil device, which circulates lubricating oil from an oil tank in a bearing box that houses bearings for rotating shafts of turbines and generators, and oil generated in the bearing box. Exhaust gas containing mist is sent to an oil tank, and the oil mist collecting device connected to an exhaust pipe provided in the oil tank separates and collects the oil mist to remove gas in the bearing box. An oil mist collecting device for discharging to the outdoors, characterized in that the oil mist collecting device comprises a settling chamber having a corrugated wall surface extending in the axial direction protruding from the outer peripheral surface of the exhaust pipe. apparatus. 4. The bearing box oil mist collecting device according to claim 3, wherein a cooling pipe having openings at upper and lower end surfaces is provided in a corrugated wall surface located in the calming chamber. Lubricating oil mist collection device for boxes. 5. The oil mist collecting device for a bearing box according to any one of claims 1 to 4, wherein the oil mist from the oil tank is fed from the upper part of the sedation chamber and stored inside the sedation chamber. An oil mist collecting device for a bearing box, characterized in that the gas separated from the oil mist is discharged from a discharge port of an exhaust pipe located below the sedation chamber.