JPH11132190A - Turbo compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously prevent lubricating oil from deterioration in a step-up gear. SOLUTION: In a turbo compressor where a step-up gear 1 storing a pinion 4 and a gear 3 in a casing 2 is placed just above gas coolers 5A, 5B, a hydraulic regulating valve 6 for supplying cooled lubricating oil to the step-up gear 1 with adjusting its pressure is placed on the opposite side of a lubricating oil discharge hole 9 crossing the gear 3 in the casing 2, and an oil injecting means 7 for injecting the lubricating oil to the gear 3 is provided in the casing 2 on the same side as the hydraulic regulating valve 6. The gear 3 is rotated in the flow direction of the lubricating oil flowing from the hydraulic regulating valve 6 side to the lubricating oil discharge hole 9 side on the bottom of the casing 2. In addition, by standing a buffer bank 10 on the bottom of the casing 2 contacting with high temperature parts of the gas coolers 5A, 5B, the lubricating oil splashed from the rotating gear 3 is softly received and is prevented from rebounding so that the lubricating oil does not again collide with the gear 3, and the flow of the lubricating oil is not hindered on the bottom of the casing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbo compressor, and more particularly, to an improvement in a lubrication / cooling device of a gearbox in a turbo compressor.

[0002]

2. Description of the Related Art Conventionally, many turbo compressors having a speed increaser and having a structure in which a gas cooler is disposed immediately below a speed increaser are often used. In this case, heat from a high temperature portion of the gas cooler is used. Direct propagation to the gearbox is inevitable.

In such a turbocompressor, when the heat from the high temperature portion of the gas cooler (up to about 200 ° C.) cannot be efficiently cooled, for example, lubricating oil (also serving as cooling) is deposited on the bottom inside the casing of the gearbox. In the case of a structure that temporarily accumulates, the accumulated lubricating oil may be heated by heat from the high temperature portion of the gas cooler, causing deterioration and burning. In addition, the lubricating oil that has been shaken off from the rotating gear and collided with the bottom of the casing collides again with the gear,
It may be accelerated by the gear.

[0004]

When the lubricating oil deteriorates or burns, the original lubrication and cooling performance naturally deteriorates.
As a result, problems such as damage to the gears and bearings resulting in a marked reduction in the life of the gearbox occur. In addition, there is a problem that mechanical loss increases due to acceleration of the lubricating oil.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the conventional apparatus. Accordingly, an object of the present invention is to prevent the deterioration phenomenon of the lubricating oil in the gearbox. Another object of the present invention is to provide a turbocompressor which prevents mechanical loss, reduces mechanical loss, and achieves stable operation, long life, and improved efficiency of the entire turbocompressor including a speed increaser.

[0006]

The present invention has the following configuration to achieve the above object. The invention according to claim 1 of the present invention is directed to a turbo compressor in which a speed-increasing device that stores a pinion and a gear meshing with each other in a casing is disposed immediately above a gas cooler that cools discharge gas. A hydraulic pressure adjusting valve for supplying oil to the gearbox after adjusting the pressure of the oil is provided at a location on the casing opposite to the lubricating oil discharge port across the gear and injects the lubricating oil to the gear. The oil injection means is provided in the casing so as to be located on the same side as the hydraulic pressure adjusting valve.

According to a second aspect of the present invention, in accordance with the first aspect of the present invention, the gear is provided with a lubricating oil which flows from an inner bottom portion of the casing to the lubricating oil discharge port side from the hydraulic pressure adjusting valve side. It is characterized by being rotated in a co-current direction matching the flow direction.

According to a third aspect of the present invention, in accordance with the second aspect of the present invention, a buffer weir is provided upright at a bottom portion of a casing in contact with a high-temperature portion on the gas inflow side of the gas cooler. While the damping weir receives the lubricating oil scattered from the rotating gears and collides and scatters on the inner bottom of the casing, the lubricating oil is buffered so as not to collide with the gears again to prevent rebound, while lubrication at the inner bottom of the casing is prevented. It is characterized in that it is formed so as not to obstruct the flow of oil.

According to the present invention, lubricating oil cooled at about 40 ° C. by an oil cooler or the like flows through the inner bottom of the casing from the hydraulic pressure adjustment valve side to the lubricating oil discharge port side, and the oil fluidized bed extends therebetween. Is formed, the maximum temperature is about 200
It is possible to directly cool the bottom of the casing of the gearbox due to the influence of heat from the high temperature section of the gas cooler, which can be as high as ℃. Oil deterioration phenomena such as scorching due to overheating of the lubricating oil can be eliminated.

Further, according to the present invention, the rotation direction of the gear is determined to be a co-current direction that matches the flow direction of the lubricating oil flowing from the hydraulic pressure adjustment valve side to the lubricating oil discharge port side on the inner bottom of the casing. As a result, the air flow in the casing generated by the rotation of the gears has a co-current relationship matching the flow of the lubricating oil flowing from the hydraulic pressure adjustment valve side to the lubricating oil discharge port side, so that the flow of the oil fluidized bed at the bottom of the casing is further improved. It becomes smooth and the cooling action is promoted.

According to the present invention, the buffer weir described above is provided at a predetermined position on the bottom of the casing.
The cooling effect is further promoted by the heat dissipation effect of the buffer weir, and the lubricating oil is prevented from rebounding, so that the oil does not adhere to the gear teeth or the like again, and mechanical loss due to accelerating the oil can be prevented. .

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing a partial cross section of a gearbox according to an embodiment of the present invention.
FIG. 2 is a partial plan view in the direction of arrow A in FIG. 1.

In FIG. 1, reference numeral 1 denotes a gearbox, which is a device serving as a rotary drive element of a turbo compressor. A gear (large gear) 3 and a pinion 4 meshing with the gear 3 are stored in a casing 2. The rotation output from a drive source (not shown) is transmitted to the shaft 12 of the gear 3, and is transmitted to the impeller of a turbo compressor (not shown) via the gear 3 and the pinion 4.

The gearbox 1 is integrated with a base provided with gas coolers 5A and 5B for cooling the discharge gas and an oil tank 8, and a gear portion including a gear 3 and a pinion 4 is provided with a high temperature of the gas coolers 5A and 5B. It is arranged so as to be located immediately above the part. In the case of the illustrated example, the casing 2 of the gearbox 1 is composed of the upper casing and the lower casing.
A gear chamber for storing the gear portion is provided at the upper part, and a cooler chamber and a tank chamber for storing the gas coolers 5A and 5B comprising the cross-fin heat exchanger 11 are provided at the lower part. Although it is an integrated casing, in addition to such a structure,
The speed-increasing gear 1, the gas coolers 5A, 5B, and the oil tank 8 may be formed separately, and may have a structure integrally provided in an arrangement as shown in the figure.

The gearbox 1 is provided with a hydraulic pressure adjusting valve 6 and oil injection means 7 realized by oil nozzles at predetermined locations. The hydraulic pressure adjusting valve 6 is attached to an oil supply port opened in a side wall portion of the casing 2 at a position opposite to the lubricating oil discharge port 9 immediately above the oil tank 8 with the gear 3 interposed therebetween,
On the other hand, the oil nozzle 7 is stored in the casing 2 at a position above the oil supply port, and is provided in such an arrangement that the nozzle tip is directed obliquely downward with respect to the meshing portion of the pinion 4 and the gear 3.

When lubricating oil taken out of the oil tank 8 and cooled by an oil cooler (not shown) is supplied to the hydraulic pressure adjusting valve 6, the lubricating oil is reduced to an appropriate pressure and then supplied to the casing 2 as cooling oil. An oil supply valve for cooling the inside of the casing 2 by supplying the oil. On the other hand, when the lubricating oil cooled by the oil cooler is supplied, the oil nozzle 7 injects the lubricating oil to the gear 3 to , A lubrication device for lubricating the pinion 4 and a bearing (not shown).

In the speed increaser 1 configured as described above, when the turbo compressor is operated by being rotationally driven, the gas cooler 5A, which cools the gas discharged from the compressor,
5B has a maximum temperature of 200 ° C., and the heat causes the bottom of the casing 2 of the gearbox 1 to become hot.
The low-temperature cooling oil (approximately 40 ° C.) supplied from the cooling oil reaches the lubricating oil discharge port 9 and collects in the oil tank 8 while forming an oil fluidized bed flowing in the direction of arrow B along the inner bottom of the casing 2. Therefore, the bottom of the casing 2 whose temperature has been increased by the oil fluidized bed can be efficiently cooled,
Oil scorching at the bottom of the gearbox 1 can be prevented. The oil injected from the oil nozzle 7 and lubricating the gear 3, the pinion 4 and the bearing (not shown) falls to the inner bottom of the casing 2, mixes with the oil fluidized bed, and is collected in the oil tank 8.

The embodiment shown in FIG. 1 has a structure in which the oil tank 8 is provided adjacent to the outlet side chamber (low temperature side) of the gas cooler 5B. The oil (approximately 65 ° C.) inside the gas 8 slightly heats the gas at approximately 40 ° C. in the outlet side chamber to avoid a saturated state, and has an effect of avoiding drain generation on the gas side.

In such a speed-increasing gear 1, the rotation direction of the gear 3 may be either clockwise or counterclockwise, but in the present embodiment, as shown by an arrow C in FIG. It is defined to be counterclockwise counterclockwise. That is, the rotation direction of the gear 3 is determined to be a co-current direction that matches the flow direction B of the lubricating oil flowing from the hydraulic adjustment valve 6 side to the lubricating oil discharge port 9 side in the inner bottom portion of the casing 2. By doing so, the air flow in the casing 2 generated by the rotation of the gear 3 has a co-current relationship matching the flow of the lubricating oil flowing from the hydraulic adjustment valve 6 side to the lubricating oil discharge port 9 side. The flow of the oil fluidized bed becomes smoother, and the cooling action is promoted.

In the embodiment shown in FIG. 1, the speed increasing gear 1 is further provided with a buffer weir 10. The buffer weir 10 is provided upright at a position below the gear 3 at the inner bottom of the casing 2. In this case, the position where the buffer weir 10 is provided is the bottom inside the casing 2 that is in contact with the high-temperature part on the gas inflow side of the gas coolers 5A and 5B, and faces downward from the meshing part of the rotating gear 3 with the pinion 4. This is a position where the lubricating oil that is shaken off can be received in a buffered manner. The buffer weir 10 has a height enough to buffer the lubricating oil that is shaken downward as described above, and a depth dimension of the inner bottom of the casing 2, that is, a length shorter than the axial dimension of the gear 3. And has a depth dimension substantially the same as the tooth width of the casing 2, and is erected at the center of the bottom of the casing 2.

The damping weir 10 provided in this manner receives the lubricating oil that is shaken downward from the rotating gear 3 and collides and scatters on the inner bottom of the casing 2, and receives the lubricating oil in a buffered manner so as not to collide with the gear again. The lubricating oil flowing through the inner bottom portion of the casing is prevented from rebounding from the inner bottom portion, and the lubricating oil flows smoothly to the passages (see FIG. 2) formed adjacently on both sides without interrupting the flow. Therefore, the lubricating oil flowing through the inner bottom of the casing 2 rebounds due to the collision of the lubricating oil that is shaken off from the gear 3, and the lubricating oil flowing through the inner bottom portion of the casing 2 rebounds. It is possible to prevent the oil from accumulating on the gears and the like again, and to exert the effect of preventing the occurrence of mechanical loss due to acceleration of the oil.

[0022]

The present invention is embodied in the form described above and has the following effects. That is,
According to the present invention, the cooled lubricating oil flows from the oil pressure adjusting valve side to the lubricating oil discharge port side of the casing inner bottom to form an oil fluidized bed therebetween, thereby increasing the maximum temperature to about 200 ° C. The bottom of the gearbox casing is heated by the influence of the heat from the high-temperature section of the gas cooler, and it is possible to effectively cool the bottom of the gearbox from rising to a high temperature. It is possible to eliminate the oil deterioration phenomenon that has been frequently caused in the past such as scorching.

Further, according to the present invention, the direction of rotation of the gear is set to a co-current direction which coincides with the direction of flow of the lubricating oil flowing from the hydraulic pressure adjustment valve side to the lubricating oil discharge port side on the inner bottom of the casing. Since the generated air flow in the casing has a co-current relationship matching the flow of the lubricating oil, the flow of the oil fluidized bed at the bottom of the casing is further smoothed, and the cooling action is promoted.

Further, according to the present invention, by providing the buffer weir at a predetermined position on the bottom of the casing, cooling is further promoted by the heat radiating effect of the buffer weir and lubricating oil is prevented from splashing to accelerate the oil. This can prevent mechanical loss.

[Brief description of the drawings]

FIG. 1 is a front view showing a partial cross section of a gearbox according to an embodiment of the present invention.

FIG. 2 is a partial plan view in the direction of arrow A in FIG.

[Explanation of symbols]

1 ... gearbox 2 ... casing 3
… Gear 4… pinion 5A… gas cooler 5B
... gas cooler 6 ... hydraulic adjustment valve 7 ... oil injection means 8
… Oil tank 9… lubricating oil outlet 10… buffer weir 11
... heat exchanger 12 ... shaft

Claims (3)

[Claims] In a turbo compressor, a speed increaser that stores a pinion and a gear meshing with each other in a casing is disposed immediately above a gas cooler that cools discharge gas, after adjusting pressure of cooled lubricating oil. A hydraulic pressure adjusting valve for supplying to the gearbox is provided at a position opposite to the lubricating oil discharge port across the gear in the casing, and an oil injection unit for injecting lubricating oil to the gear is provided by the hydraulic A turbo compressor, which is provided in the casing so as to be located on the same side as a regulating valve. 2. The turbo compression according to claim 1, wherein the gear is rotated in a co-current direction that matches a flow direction of the lubricating oil flowing from the hydraulic pressure adjustment valve side to the lubricating oil discharge port side through the inner bottom of the casing. Machine. 3. A buffer weir is provided upright at the bottom of the casing in contact with a high-temperature portion on the gas inflow side of the gas cooler, and the buffer weir removes lubricating oil that is shaken off from a rotating gear in the casing. 3. The turbo compression device according to claim 2, wherein the turbo compression is formed so as to buffer and prevent the rebound from colliding and scattering on the bottom portion so as not to collide with the gear again to prevent rebound. Machine.