JPH0663457B2 - Exhaust turbine turbocharger bearing stand - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing stand that supports a bearing of an exhaust turbine supercharger applied to a rotary compressor and a gas turbine.

2. Description of the Related Art FIG. 4 and FIG. 5 are sectional views showing the structure of a bearing stand that supports a bearing of a conventional exhaust turbine supercharger. Lubricating oil for the exhaust turbine supercharger passes from the portion A of the bearing base 3 through the common path 3a to the plain bearings 5 and 6 for supporting the rotor 4 and the thrust bearing 7,
8 are supplied. At this time, the lubricating oil amount of each bearing is adjusted by the diameter of each branch pipe according to the cooling and lubricating functions. This branch pipe diameter is usually determined by a planned value that has a sufficient margin so that no malfunction occurs at the maximum output of the exhaust turbine supercharger. In FIG. 4, the gas outlet casing 1,
The vortex chamber 2, turbine disk 4a and impeller 4b are shown.

Problems to be Solved by the Invention Such a lubricating oil system functions satisfactorily even during normal operation of the exhaust turbine supercharger even at maximum output. However, when the exhaust turbine supercharger is brought to an emergency stop, the bearing on the exhaust gas side becomes hot due to the amount of heat retained by the turbine disk 4a, but the above-mentioned regular lubricating oil system does not have the ability to sufficiently cool it.

In order to solve this problem, an emergency system including a gravity tank 27, an emergency passage 26, an emergency lubrication oil intake port F from the gravity tank, and a return pipe 28 as shown in FIG. 3 is provided for cooling, Especially when cooling the bearing on the exhaust gas side,
Since the capacity of the emergency gravity tank 27 is large at 0.5 to 1.5 m ³ and it is necessary to install it at a position higher than the exhaust turbine supercharger 30 (5 meters or less), engine outfitting (piping)
It has the disadvantage of high costs and overall costs. Lubricating oil is supplied in order to prevent burnout of the exhaust turbine side plain bearing 5 (Fig. 4). However, since the conventional structure does not have a function of lubricating only a specific bearing, a large amount of lubricating oil is used to improve efficiency. bad. Further, there are problems that the outfitting cost for the ship is high and that the installation place of the gravity tank 27 is restricted.

Means for Solving the Problems The present invention has been made in order to solve the problems of the related art as described above, and in a bearing stand that supports bearings of an exhaust turbine supercharger, lubrication communicated with each bearing is provided. The oil passage is divided into a normal passage and an emergency passage used during emergency stop, and the connection between the inlet passage from the lubricating oil pump and the regular passage and the connection between the gravity tank and the emergency passage are switched. Provide a switching valve and set the diameter of the supply hole to each bearing formed in the emergency passage according to the amount of lubricating oil required for each bearing for cooling and lubrication during an emergency stop of the turbocharger. It is characterized by being set by.

Action According to the above means, when the exhaust turbine supercharger is in an emergency stop, the switching valve operates due to fluctuations in hydraulic pressure to switch the lubricating oil passage in the bearing stand from the regular passage to the emergency passage, which causes the gravity tank to Lubricating oil flows into the emergency passage, and the lubricating oil is supplied to the respective bearings through the respective supply holes in an amount required for cooling and lubricating the respective bearings.

Embodiment FIG. 1a to FIG. 1c and FIG. 2 show a bearing stand of an exhaust turbine supercharger which is a preferred embodiment of the present invention. In FIG. 1a, the lubricating oil taken into the main body of the exhaust turbine supercharger from the lubricating oil inlet A of the bearing stand 3 passes through the lubricating oil common passage 3a and supports the rotor 4 (FIG. 1c). It is supplied to plain bearings 5 and 6 and thrust bearings 7 and 8. Further, in the present invention, in case of emergency stop of the exhaust turbine supercharger as shown in FIG. 1c, in addition to the lubricating oil common passage 3a,
An emergency passage 3b is provided. A partially enlarged schematic view of the emergency passage 3b is shown in FIG. 1b. When the exhaust turbine supercharger is in an emergency stop, the bearing on the exhaust gas side, that is, the turbine side plain bearing 5, receives extremely high heat from the heat quantity of the turbine disk. Therefore, as shown in FIG. 1b, the lubricating oil supply hole diameter from the emergency passage 3b leading to the turbine side plain bearing 5 near the turbine disk 4a is d ₁ , and the blower side plain bearing 6 is provided.
The diameter of the lubricating oil supply hole of d ₂ and both thrust bearings 7, 8
When the diameter of the lubricating oil supply hole is set to d ₃ , it is necessary and sufficient to prevent the bearings from being burned by the heat transferred from the rotor 4 to each bearing when the exhaust turbine supercharger is in an emergency stop. Make sure the hole diameter is large enough to give a sufficient amount of lubricating oil. In this way, if the bearing on the heated side is cooled intensively, the function can be sufficiently satisfied. As a result, the lubricating oil flow rate can be significantly reduced compared to when the regular passage 3a is used (test result shows that the gravity tank volume is 0.5 to 1 m ³ to 0.01
The ~0.03m ^3, was about 1 / 50-1 / 30 can be reduced).

Further, FIG. 1c shows a front view of the bearing stand 3. Lubricating oil passage 3
The positional relationship between a and 3b is symmetrical about the center of the rotor, and the emergency passage 3b is arranged below the regular passage 3a. The reverse is also possible.

FIG. 2 shows details of the lubricating oil intake port of the bearing stand 3. In the switching valve 10, the valve rod 11 is pushed down by the pressure from the lubricating oil intake port E of the switching valve during normal use and can be connected to the normal passage 3a. Further, when the operation of the lubricating oil pump outside the exhaust turbine supercharger is stopped, the valve rod 11 is moved upward by the spring 12 and the lubricating oil intake E
Section and the service passage 3a are closed, and the emergency lubricating oil intake F portion from the gravity tank and the emergency passage 3b are opened.
Lubricating oil from the gravity tank can be quickly supplied to each bearing. The above-described mechanism can be achieved without using the switching valve 10 together, but in this case, the lubricating oil intake port E is connected to the regular passage 3a and the emergency lubricating oil intake port F is connected to the emergency passage 3b. do it.

Fig. 3 shows a lubricating oil system diagram. Lubricating oil supplied from the sump tank 20 passes through the pump 21, the cooler 22, and the strainer 23, passes from the supercharger intake port 25 to the lubricating oil intake port E connected thereto, and lubricates the supercharger 30. Then, it returns to the sump tank 20 through the return pipe 29. Further, part of the lubricating oil that has passed through the strainer 23 returns to the sump tank 20 via the adjustment valve 24, the emergency passage 26, the gravity tank 27 and the return pipe 28. The emergency passage 26 is an emergency lubricating oil passage 3b (see FIG. 2).
It is connected to the emergency lubrication oil intake port F, which feeds the lubrication oil to each bearing. The gravity tank 27 is provided above the central portion of the main body of the supercharger 30 by H meters. Conventionally, the pressure was kept at 0.4 kg / m ² at 5 meters or less, but according to the present invention, since the capacity of the gravity tank 27 is small, a place that can be installed around the supercharger 30 can be easily selected. . Furthermore, since the pipe length is short and the flow rate is small, the resistance is small, and the lubricating oil can be sufficiently supplied even if the H is 1 meter or less. The O-ring 13 and the lid are shown in FIG.
14 and the lubricating oil outlet G are also shown.

EFFECTS OF THE INVENTION As described above, according to the present invention, the lubricating oil regular passage and the emergency passage provided inside the bearing stand of the exhaust turbine are configured to be switchable by the switching valve. It can be selectively used depending on the application and function, and the amount of use can be reduced by effectively using the lubricating oil. In addition to reducing the amount of lubricating oil, the size of the emergency passage can be reduced to reduce the capacity of the gravity tank to about 1/20 to 1/50 that of the conventional one.
Further, since the emergency passage is throttled immediately before the bearing, the passage loss is minimal, and the height of the gravity tank is about 1/5 of that of the conventional one due to the proper use of the normal passage and the emergency passage.
Can be as low as 1 meter or less. Furthermore, in addition to the normal passage and the emergency passage being provided inside the bearing stand, the diameter of the supply hole to each bearing formed in the emergency passage is adjusted to cool the exhaust turbine supercharger during an emergency stop. In addition, since it is set according to the amount of lubricating oil required for each bearing for lubrication, the external pipe system of the turbocharger need only be one system, and there is no need to have two systems for normal use and emergency use. It is not necessary to provide a lubricating oil distribution means in the middle of the emergency system. Therefore, it is easy to connect the heavy oil tank to the turbocharger, and the installation location of the gravity tank can be easily selected. As a whole, it is possible to effectively use the inboard volume and significantly reduce the cost of outboard fitting (piping). Becomes

[Brief description of drawings]

FIG. 1a is a cross-sectional view of an exhaust turbine supercharger (I-I cross section in FIGS. 1c and 2), which is a preferred embodiment of the present invention.
FIG. 1b is a partially enlarged view of the lubricating oil passage 3b, and FIG. 1c is a vertical sectional view of an exhaust turbine supercharger according to a preferred embodiment of the present invention.
Fig. 1 is a further enlarged sectional view of Fig. 1c, Fig. 3 is a lubricating oil system diagram outside the exhaust turbine supercharger, and Fig. 4 is a transverse sectional view of a conventional exhaust turbine supercharger (IV- in Fig. 5). IV cross section), 5th
FIG. 1 is a vertical sectional view of a conventional exhaust turbine supercharger. 1 ... Gas outlet casing, 2 ... Vortex chamber, 3 ... Bearing stand, 3a ... Lubricant oil regular passage, 3b ... Lubricant oil emergency passage,
4 ... Rotor, 4a ... Turbine disk, 4b ... Impeller, 5 ... Turbine side plain bearing, 6 ... Blower side plain bearing,
7 ... Turbine side thrust bearing, 8 ... Blower side thrust bearing, 10 ... Switching valve, 11 ... Valve rod, 12 ... Spring, 13 ... O-ring, 14 ... Lid, 20 ... Sump tank, 21 …… pump, 22 …… cooler, 23 …… strainer, 24…
… Regulator valve, 25 …… Supercharger intake, 26 …… Emergency passage, 27
...... Gravity tank, 28,29 …… Return pipe, 30 …… Supercharger,
A: Lubricating oil intake of the bearing stand 3, E: Lubricating oil intake of the switching valve, F: Emergency lubricating oil intake from the gravity tank,
G: Lubricating oil outlet of bearing base 3.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication No. Sho 35-17058 (JP, B2) No. Sho 36-22002 (JP, Y1) No. Sho 53-149805 (No. Sho 55-67322) Microfilm (JP, U), which is a photograph of the details and drawings attached to the application

Claims (1)

[Claims] 1. A bearing stand for supporting a bearing of an exhaust turbine supercharger, wherein a lubricating oil passage communicating with each bearing is divided into a normal passage and an emergency passage used during emergency stop, and an inlet from a lubricating oil pump. A switching valve is provided for switching the connection between the passage and the normal passage and the passage connected to the gravity tank and the emergency passage, and the diameter of the supply hole to each bearing formed in the emergency passage is A bearing stand for an exhaust turbine supercharger, which is set according to the amount of lubricating oil required for each bearing for cooling and lubrication during emergency stop of the supercharger.