JPH11107986A - Speed increasing mechanism for turbo-compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speed increasing mechanism for a turbo-compressor, which can effectively prevent leakage of oil from the casing without necessity of the least power and with a simple structure. SOLUTION: A speed increasing mechanism 1 includes, within a casing 3, a gear 4, an oil jetting means for jetting lubricating oil onto the gear 4, a pinion 5 meshed with the gear 4, a bearing 6 for journalling the pinion shaft 7, and an oil seal 8 for preventing leakage of the oil from the casing 3 through the pinion shaft 7, a space 9 for discharging the lubricating oil applied to and led from the bearing 6, being defined between the bearing 6 and the oil seal 8. In this speed increasing mechanism 1, the inside of the casing 3 is communicated with an atmospheric space outside the casing 1, through an air passage 11 which is formed in the casing 3, and which is composed of an air hole 12 piercing through the casing 3 at a position above the space 9, and an air pipeline 13 connected to the air hole 12 on the atmospheric side of the latter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed increasing mechanism of a turbo compressor, which can surely prevent leakage of lubricating oil out of the machine under low-cost facilities.

[0002]

2. Description of the Related Art As a conventional device for preventing gear oil leakage such as a geared type centrifugal compressor, etc.
There is prior art disclosed by −8621 (issued on May 2, 1994). This is because in a geared type centrifugal compressor, a pipe is provided from a labyrinth part for a shaft seal to a negative pressure area near a gear through a suction passage, and oil entering the shaft seal is increased by using the negative pressure. It is intended to return to the inside and prevent oil leakage.

[0003] In such prior art, pipes are required in the casing of the gearbox, which is not only complicated in terms of machining but also pipes are located inside the gearbox at locations that cannot be seen from outside the machine. In some cases, there is a danger that a serious accident may occur if the mounting screws are not loosened when they occur.

On the other hand, there is a prior art proposed in Japanese Patent Application No. 6-123899, which includes a vent pipe mounted on an upper part of an oil tank for circulating and supplying lubricating oil to a mechanical device. An exhaust fan disposed at a lower portion of the vent pipe, for forcibly exhausting the inside of the oil tank, and suppressing an increase in pressure in the oil tank due to heat given to circulating supply oil from a mechanical device. An exhaust device, wherein an oil reservoir for collecting oil drain is provided at a lower portion of the honeycomb pipe following the outlet of the exhaust fan, and an oil reservoir is provided between the bottom of the oil reservoir and the oil tank. In addition, a return pipe provided with a flow control valve in the middle is provided to suppress the release of oil smoke to the outside while keeping the inside of the oil tank at an appropriate negative pressure.

In this prior art, when the exhaust fan exhausts the oil from the oil tank, it is often far away from the oil seal portion where oil leakage easily occurs and the upper and lower divided surfaces of the gearbox casing. Oil leakage may occur, and it is expected that the oil leakage will not be achieved as much as expected. Another problem is that another drive source for moving the exhaust fan is required.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such problems of the conventional apparatus, and therefore, an object of the present invention is to eliminate the need for any power. An object of the present invention is to provide a speed increasing mechanism of a turbo compressor which can effectively prevent oil leakage from inside a casing to outside with a simple structure.

[0007]

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 gear, an oil injection means for injecting lubricating oil to the gear, a pinion meshing with the gear, a bearing supporting the pinion shaft, and preventing leakage of lubricating oil to the outside via the pinion shaft. A speed increasing mechanism of a turbo compressor having an oil seal for preventing oil in a casing, and a space for discharging lubricating oil lubricating the bearing is formed between the bearing and the oil seal. Is connected to an external atmospheric pressure space through an air passage provided in the casing.

According to a second aspect of the present invention, in the speed increasing mechanism for a turbo compressor according to the first aspect, the air passage provided in the casing includes the space between a bearing and an oil seal. Is formed by an air hole penetrating the casing at a position above the air hole and an air pipe connected to the air side of the air hole.

According to a third aspect of the present invention, in the speed increasing mechanism for a turbo compressor according to the first aspect, the air passage provided in the casing is provided at a position below the bearing for supporting a pinion shaft. It is characterized by being formed by an air hole penetrating the casing and an air pipe connected to the air side of the air hole.

According to a fourth aspect of the present invention, in the speed increasing mechanism for a turbo compressor according to the first aspect, the air passage provided in the casing is located at a position above the pinion and rotates. An air hole penetrating the casing at a position where the wind generated by the gears collides,
The air hole is formed by an air pipe connected to the atmosphere side of the air hole.

According to a fifth aspect of the present invention, in the speed increasing mechanism for a turbo compressor according to the second, third or fourth aspect, an exhaust filter is attached to an atmosphere opening portion of the air line. It is characterized by having such a configuration.

According to the present invention, a portion where the pressure in the casing is increased is communicated with the outside atmospheric pressure space through the air passage provided in the casing, so that the portion is opened to the atmosphere and is evenly opened. Since the pressure is increased, it is possible to prevent the lubricating oil from leaking from the inside of the speed increasing mechanism to the outside.

In the case where the speed increasing mechanism has a structure in which the bottom is not directly connected to the oil tank but has a bottom, the lubricating oil collides with the bottom of the casing below the pinion, so that the lubricating oil is foamed or atomized. Filling and heating the oil turns into oily smoke,
The pressure increases due to the increased volume. By releasing the high pressure portion to the atmosphere through the air passage to the atmosphere, the pressure rise can be suppressed and the lubricating oil can be prevented from leaking to the outside.

In particular, according to the present invention, since the air hole is penetrated through the casing and an air pipe such as a tube is simply connected to the atmosphere side of the air hole, the structure is simple and the structure is simple. Since no other drive source is required for preventing oil leakage, low equipment costs and low running costs can be achieved. Further, by attaching an exhaust filter to the air line, it is possible to prevent oil smoke from being discharged to the outside.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view according to a first embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a main part according to the embodiment shown in FIG.

1 and 2, reference numeral 1 denotes a speed increasing mechanism, 2 denotes a turbo compressor, and the speed increasing mechanism 1 is a device provided for driving a turbo compressor as is well known. 4. A pinion 5 meshing with the gear 4 is provided, and a rotation output from a drive source (not shown) is
, And transmitted to the impeller of the turbo compressor 2 via the pinion 5. The pinion 5 is rotatably supported via a pinion shaft 7 by a pair of bearings 6 provided on both left and right sides in the casing 3. An oil seal 8 is provided around the outer periphery of the bearing 6 in the pinion shaft 7 so as to prevent the lubricating oil from leaking outside the casing 3 along the pinion shaft 7. Further, a space 9 is formed between the oil seal 8 and the bearing 6 for discharging the lubricating oil lubricating the bearing 6 toward the inner bottom of the casing 3.

As shown in FIG. 3 according to a second embodiment of the present invention to be described later, the speed increasing mechanism 1 is provided with an oil injection means 10 realized by a nozzle at an intermediate level position in the casing 3. And lubricating oil supplied from an oil tank (not shown) provided separately from the speed increasing mechanism 1 to the gear 4 to lubricate the gear 4, the pinion 5 and the bearing 6. It has become.

In the speed increasing mechanism 1 configured as described above, especially when there is a bottom for storing the lubricating oil and this bottom is not directly connected to the oil tank, the lower portion of the pinion 5 is rotating. When the lubricating oil scattered from the gear 4 and the pinion 5 collides with the inner bottom of the casing 3, the lubricating oil becomes foamy and mist-like, and is filled. Is increased, so that the pressure in the casing 3 becomes higher than the atmospheric pressure. In this embodiment, the inside of the casing 3 is communicated with an external atmospheric pressure space via the air passage 11 in order to suppress such a pressure increase.

The air passage 11 in the present embodiment includes an air hole 12 penetrating through the top wall of the casing 3,
An air passage formed by an air conduit 13 formed of a small-diameter tube such as a flexible tube connected to the air side of the air hole 12 is applied. In this case, the air hole 12 is
An upper position of the space 9 formed between the oil seal 8 and the oil seal 8 is set so as to penetrate the top wall of the casing 3. The position where the air hole 12 is provided corresponds to a portion adjacent to the above-mentioned location where the oil smoke of the lubricating oil is generated. Therefore, by providing an air hole at the above position and forming the air line 13 as described above, the pressure equalizing action based on the opening to the atmosphere is effectively performed, and thus the oil from the inside of the speed increasing mechanism 1 is removed. It is possible to prevent an attempt to leak outside due to the pressure difference. In addition, since the foam and the mist-like lubricating oil are also discharged into the air line 13 together with the oil smoke, a piping form such as bending the air line 13 upward by a suitable length and then bending it downward in a U-shape is adopted. By connecting the thin tube to the casing 3 from the bottom of the U-shaped pipe, the oil droplets and oil film of the lubricating oil adhering to the inner wall of the tube can be easily returned to the casing 3 without being directly discharged to the atmosphere. Such measures may be taken.

Further, as shown in FIG. 2, a joint 15 is connected to the open end of the two-system air passage 11 on the atmosphere side.
By mounting the exhaust filter 14 at the end of the air passage through the air passage 5, it is possible to make the pressure equalize without releasing any oily smoke to the outside, and such an embodiment is preferable for the present invention. It is.

Next, FIG. 3 is a side view showing a schematic structure of a speed increasing mechanism 1 according to a second embodiment of the present invention. This embodiment is similar to the first embodiment shown in FIGS. 1 and 2, and corresponding members are denoted by the same reference numerals and detailed description of the structure is omitted. The feature of the second embodiment is that the air passage 11 is provided in relation to the lower part of the side wall of the casing 3. That is, the air hole 1 provided through the side wall of the casing 3 at a position below the bearing 6 on the side wall of the casing 3.
An air passage is formed by 2 and an air conduit 13 which is realized by a small-diameter tube such as a flexible tube connected to the air side of the air hole 12.

In such an embodiment, the air hole 1
The position where 2 is provided is a position where the lubricating oil scattered from the rotating gear 4 and the pinion 5 collides with the inner bottom portion of the casing 3 to form a foam or a mist and is directly filled with a portion where oil smoke is generated. There is, therefore, an effect of directly equalizing the pressure increasing portion to the atmosphere, so that it is possible to reliably prevent the oil from leaking from the inside of the casing 3 to the outside due to the pressure difference. In this embodiment, as in the first embodiment, it is preferable to attach the exhaust filter 14 to the open-to-atmosphere portion.

FIG. 4 is a side view showing a schematic structure of a speed increasing mechanism 1 according to a third embodiment of the present invention. This embodiment is similar to the first embodiment shown in FIGS. 1 and 2, and corresponding members are denoted by the same reference numerals and detailed description of the structure is omitted. The feature of the third embodiment is that the air passage 11 is provided in relation to the upper part of the side wall of the casing 3. An air hole 12 penetrating the side wall of the casing 3 at a position above the pinion 5 and at a position where wind generated by the rotating gear 4 collides with the pinion 5;
An air passage is formed by the air pipe 13 which is realized by a small diameter pipe such as a flexible tube connected to the air side of the air hole 12.

In such an embodiment, the air hole 1
The location where 2 is provided is the location closest to the location where it comes into direct contact with the wind generated by the rotating gear 4 and the lubricating oil becomes foamy and mist-like and fills to generate oily smoke. As in the above-described embodiments, since the portion where the pressure becomes high can be directly equalized to the atmosphere, it is possible to reliably prevent the oil from leaking from the inside of the casing 3 to the outside due to the pressure difference. it can. In this embodiment, as in the first and second embodiments, it is preferable that the exhaust filter 14 is attached to the atmosphere opening portion.

[0025]

The present invention is embodied in the form described above and has the following effects. That is,
According to the present invention, a portion where the pressure in the casing is increased is communicated with an external atmospheric pressure space through an air passage provided in the casing, so that the pressure is released to the atmosphere and equalized. It is possible to prevent the lubricant oil from leaking from the inside of the speed increasing mechanism to the outside. Moreover, since the air passage is directly formed in the speed increasing mechanism itself, the pressure is equalized in the oil seal portion and in a portion close to the upper and lower dividing surfaces of the speed increasing mechanism, so that the effect of preventing the leakage of the lubricating oil is extremely large. Since the structure is extremely simple, it can be applied at low cost.

[Brief description of the drawings]

FIG. 1 is a front view according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part according to the embodiment shown in FIG. 1;

FIG. 3 is a schematic side view according to a second embodiment of the present invention.

FIG. 4 is a schematic side view according to a third embodiment of the present invention.

[Explanation of symbols]

1. Speed-up mechanism 2. Turbo compressor 3.
... Casing 4 ... Gear 5 ... Pinion 6
... bearing 7 ... pinion shaft 8 ... oil seal 9
... space 10 ... oil injection means 11 ... air passage 1
2 ... air hole 13 ... air line 14 ... exhaust filter 1
5 Joint

Claims (5)

[Claims] 1. A gear, oil injection means for injecting lubricating oil to the gear, a pinion meshing with the gear, a bearing for supporting the pinion shaft, and an oil seal for preventing leakage of lubricating oil to the outside along the pinion shaft. In a speed increasing mechanism of a turbo compressor having a space formed between the bearing and the oil seal for discharging lubricating oil that lubricates the bearing, the inside of the casing is connected to the casing. A speed increasing mechanism for a turbo compressor, wherein the speed increasing mechanism is connected to an external atmospheric pressure space through an air passage provided. 2. The air passage provided in the casing has an air hole penetrating the casing at a position above the space between the bearing and the oil seal, and an air line connected to the atmosphere side of the air hole. The speed increasing mechanism for a turbo compressor according to claim 1, wherein the speed increasing mechanism is formed by: 3. The air passage provided in the casing is formed by an air hole penetrating through the casing at a position below the bearing for supporting a pinion shaft, and an air pipe connected to the air side of the air hole. The speed increasing mechanism for a turbo compressor according to claim 1. 4. An air hole penetrating through the casing at a position above the pinion and at a position where a wind generated by a rotating gear collides with the air hole provided in the casing. 2. The speed increasing mechanism of a turbo compressor according to claim 1, wherein the speed increasing mechanism is formed by an air pipe connected to the atmosphere side. 5. The speed increasing mechanism for a turbo compressor according to claim 2, wherein an exhaust filter is attached to an atmosphere opening portion of the air pipe.