JPH0735141A - Oil-gas recoverer - Google Patents

Abstract

PURPOSE:To set a return oil route, a laying route and the installed height of an oil tank freely and to constituting this return oil route with a small calibered return oil pipe according to an amount of lubricating oil. CONSTITUTION:A connecting pipe 21 for oil-gas to be connected to a space in a bearing box 3 is connected of the other end to a gas phase part 8A in an oil tank 8. In addition, this gas phase part 8A of the oil tank 8 and an oil-gas recovery filter 14 are connected to each other through an air ejector pipe 12 equipped with an air blower 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device that supports a rotational speed and has a circulation path for flowing lubricating oil in order to prevent heat generation or wear due to friction, and to recover oil gas released from the lubricating oil. The present invention relates to an oil and gas recovery device attached to the.

[0002]

2. Description of the Related Art In a bearing device having a circulation path for this type of lubricating oil, the heat generated by the bearing is absorbed while the lubricating oil passes through the bearing, the temperature rises, and the oil is collected in an oil tank. It When this temperature rises, part of it becomes oil gas and diffuses and is released outside through the air vent hole and the gap between the bearing box and the rotating shaft. Since this oil gas condenses as the temperature decreases, oil that has become oil droplets may adhere to surrounding equipment and the like, causing contamination by the oil. In order to collect this oil gas, a method of installing an air breather having a metal wire mesh in an air vent hole as shown in FIGS. 8 and 9 (hereinafter referred to as a first conventional technique) is used.

That is, this is a cylinder 5, a wire mesh 6 and a lid 7 on top of a bearing box 3 containing a bearing 2 for supporting a rotary shaft 1.
Is a method of recovering the oil gas G by providing the air breather 4 consisting of. The same air breather 4 is also provided above the oil tank 8 that collects the lubricating oil from the bearing housing 3, and the oil gas G is also collected here. By the way, an oil supply pipe 10 having a circulation pump 9 for connecting the oil tank 8 and the slip surface of the bearing 2 and a return oil pipe 11 for connecting the oil reservoir of the bearing housing 3 and the oil tank 8 are provided in the circulation path for the lubricating oil. It consists of and.

Further, in a large rotating machine or the like, as shown in FIG. 10, the bearing box 3 and the oil tank 8 are provided with a large diameter return oil pipe 1.
1 is connected, and a gas phase part and an oil phase part are always formed in the return oil pipe 11, and the bearing box 3 is connected to the oil tank gas phase part 8A via the air extraction pipe 12 by the blower 13. Oil gas G that fills the inside and the return oil pipe 11 and the oil tank vapor phase portion 8A
Is also known (hereinafter referred to as the second related art), which is recovered by the oil gas recovery filter 14 connected to the blower 13. In addition, reference numeral 15 in the drawing denotes a driving machine, which is attached to drive the blower 13.

[0005]

Since the above-mentioned first prior art is designed mainly to prevent foreign matter such as dust from entering from the outside, all the lubricating oil is recovered from the oil gas. It is difficult to do so, and when the oil gas G is released to the outside from the gap between the rotating shaft 1 and the bearing housing 3 and the oil gas G condenses and adheres as oil droplets, the surrounding equipment is contaminated with oil. there is a possibility.

Further, in the above-mentioned second prior art, since the vapor phase portion must be always formed in the return oil pipe 11, there are restrictions on the installation route of the return oil pipe 11 and the installation height of the oil tank 8. In addition, on the other hand, there is an inconvenience that the return oil pipe 11 needs to be configured with a large diameter (about 1.5 times to twice the size of the oil supply pipe).

Therefore, an object of the present invention is to provide an oil-gas recovery device in which the installation height of the return oil path and the installation height of the oil tank can be freely determined, and the return oil path can be constituted by a return oil pipe having a small diameter. To do.

[0008]

In order to achieve the above object, the present invention provides a connecting pipe for oil and gas which has a lubricating oil circulation path independently communicating between a bearing box and an oil tank, and is provided in the oil tank. An air extraction pipe for guiding the oil gas extracted from the gas phase part to the oil gas recovery filter is provided.

[0009]

[Function] A lubricating oil circulation path is formed between the bearing housing containing the bearing and the oil tank, and the lubricating oil is sent from and collected from the oil tank. The return oil pipe used to recover the lubricating oil used here must always be formed from the vapor phase part, so the diameter is very large and the laying route can be freely determined when considering the connection with the oil tank. Absent. In addition, the position of the oil tank becomes a problem when the laying route is decided first.

In the present invention, the common type of the lubricating oil and oil gas routes, which has a great influence on the determination of the laying route, is reviewed, and a dedicated type that can be individually recovered or extracted is adopted. This structure draws a connecting pipe, which is a dedicated path for oil and gas, which is independent of the lubricating oil circulation path, between the bearing box and the oil tank. With this connecting pipe for oil and gas, the return oil pipe for lubricating oil can have a diameter equal to that of the oil supply pipe, and the return oil passage can be freely determined as the diameter decreases.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, the same components as those of FIGS. 8 to 10 according to the prior art are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1 and FIG. 2, in the oil and gas recovery system of this embodiment, the connecting pipe 21 for oil and gas connected to the space in the bearing housing 3 has the other end in the gas phase portion 8A in the oil tank 8. It is connected.

In the configuration other than the connecting pipe 21, the oil tank vapor phase portion 8A and the oil gas recovery filter 14 are used as in the prior art.
Are connected by an air extraction pipe 12 equipped with a blower 13.

Next, the operation of the above configuration will be described.

When starting the rotary shaft 1, a circulation pump 9 is used.
As a result, the oil tank 8 is started when the lubricating oil is forcibly supplied between the rotating shaft 1 and the bearing 2. At this time, when the blower 13 is activated, the oil tank gas phase portion 8A becomes a negative pressure, and the pressure in the bearing box 3 communicating with the oil tank gas phase portion 8A decreases, and as shown in FIG. Air A flows in through a gap between the rotating shaft 1 and the bearing housing 3 which are in communication with each other.

In the bearing housing 3, a lubricating oil film is formed in the gap between the rotary shaft 1 and the bearing 2 by forced oil supply by the circulation pump 9 to prevent heat generation or wear due to friction. The lubricating oil absorbs the heat generated by the bearing 2 while passing through the bearing 2, and the temperature rises. At this time, a part of the lubricating oil diffuses as an oil gas G to diffuse from the gap between the rotating shaft 1 and the bearing housing 3. Inflowing air A
Together with this, the gas is sent to the oil tank gas phase portion 8A through the communication pipe 21.

Most of the lubricating oil that is not vaporized in the bearing housing 3 passes through the return oil pipe 11 and is collected in the oil tank 8, where a part of the lubricating oil diffuses as oil gas G. Oil tank gas phase 8A
The oil gas G and the air A sent from the bearing box 3 and the oil gas G diffused in the oil tank 8 are extracted by the blower 13 and sent to the oil recovery filter 24 made of glass fiber. When the oil component of (3) passes through the glass fiber, it is condensed from the gas phase to the liquid phase and is collected and collected by adhering to the filter, and the other air G is released to the outside.

Thus, in this embodiment, the oil gas G vaporized in the bearing housing 3 is collected in the oil tank 8 through the connecting pipe 21, so that a gas phase portion is formed for flowing the oil gas G into the return oil pipe 11. There is no need to use the return oil pipe 11 and the oil supply pipe 10.
It can be configured with a thin pipe that allows an appropriate amount of lubricating oil to flow. The installation height of the oil tank 8 can be freely determined within a range in which the lubricating oil naturally flows down from the bearing box 3 to the oil tank 8, and the diameter of the return oil pipe 11 is small, so that the laying route can be determined quite freely. It will be possible to decide.

Further, another embodiment of the present invention will be described with reference to FIGS. In the embodiment shown in FIGS. 3 and 4, the driving force of the rotary shaft 1 is used for the forced air supply of the oil gas G.

FIG. 3 shows that the fan 3 is attached to the rotary shaft 1 inside the bearing housing 3.
This is an example when 1 is installed. The fan 31 rotates as the rotating shaft 1 rotates, and the air A is sucked through the gap between the rotating shaft 1 and the bearing housing 3 to increase the pressure inside the bearing housing 3. Bearing box 3
The inner space is connected to the oil tank gas phase portion 8A by the communication pipe 21, and the oil tank gas phase portion A is connected to the oil recovery filter 14 by the air extraction pipe 12 and is released to the outside when passing through the oil recovery filter 14. The air A that has been sucked in as a result of this is extracted along with the oil gas G released from the lubricating oil through the communication pipe 21 to the gas phase portion 8A of the oil tank and diffused in the oil tank 8 along with the oil gas G. Oil recovery filter 1 through pipe 12
4, the oil component in the oil gas G is collected and collected, and the other air A is discharged to the outside.

On the other hand, FIG. 4 shows an example in which a fan 32 is installed on the rotary shaft 1 outside the bearing box 3. The fan 32 prevents entrapment and guides the air A into the bearing box 3 by the fan cover 3
It is covered with 3. The fan 32 rotates together with the rotation of the rotating shaft 1 to push the air G into the bearing housing 3 and increase the pressure inside the bearing housing 3. The bearing box 3 has a connecting pipe 21 and an oil tank vapor phase portion A.
Further, the oil tank gas phase portion 8A is connected to the oil recovery filter 14 by the air extraction pipe 12, and is released to the outside when passing through the oil recovery filter 14, so that the pushed air A is discharged from the lubricating oil. Along with the released oil gas G, it is sent to the oil tank gas phase portion 8A through the communication pipe 21, and is sent to the oil recovery filter 24 through the air extraction pipe 12 together with the oil gas G that diffuses in the oil tank 8. Then, the oil content in the oil gas G is collected and collected, and the other air G is released to the outside.

Also in the embodiment shown in FIGS. 3 and 4, the return oil pipe 11 and the oil supply pipe 10 are the same as in the above embodiment.
Can have the same caliber as. Further, since the forced supply of the oil gas G is obtained from the rotation of the rotary shaft 1, it is not necessary to supply power to the blower 13.

Further, an embodiment different from the above embodiment will be described. FIG. 5 shows an embodiment in which the gas cooler 41 is installed in the air extraction pipe 12 in order to improve the recovery efficiency of the oil gas G. When the external environment temperature is 30 degrees or more, it becomes difficult to collect the oil gas recovery filter 14, and the ratio of the oil gas passing through the oil recovery filter 14 without being recovered increases. In order to improve the recovery efficiency of the oil gas G, the air extraction pipe 1
A gas cooler 41 that cools the oil gas G with cooling water or cold air W is installed at 2 to accelerate the condensation phenomenon of the oil gas G from the gas phase to the liquid phase.

As described above, this embodiment obtains the same function as that of the embodiment shown in FIGS. 1 and 2, but further makes the recovery of the oil gas G more effective, especially in a place other than a cold region. Greatly effective when applied to areas.

FIG. 6 shows an embodiment in which automatic flow rate adjusting means is installed. Loss resistance due to clogging of the oil gas G recovery filter 14 increases due to aged use, and the recovery amount of the oil gas G decreases, and it is necessary to increase the rotation speed of the blower 13 to recover the initial specified flow rate. There is. An air flow meter 51 is installed on the air extraction pipe 12, and the drive unit 15 is installed according to the detection output.
By changing the number of rotations of the blower 13 by the controller 52 that controls the number of rotations, it is possible to automatically adjust the flow rate so that the recovery amount of the oil gas G is always constant.

As described above, in the case where the automatic flow rate adjusting means is provided, the recovery of the oil gas G can be stabilized and the operation of the apparatus can be maximized.

Further, an embodiment different from each of the above-mentioned embodiments will be described.

This is an application example of the present invention in the case where a plurality of bearing boxes 3 are provided, and as shown in FIG. 7, a flow rate balance adjustment for keeping the flow rate of the oil gas G from the plurality of bearing boxes 3 uniform. Configured to incorporate the means.

Flow rate adjusting orifices 61 are installed in the connecting pipes 21 of the plurality of bearing boxes 3, respectively. Usually, the distance from the bearing box 3 to the oil tank 8 differs depending on the place where the bearing box 3 is provided, and thus a large difference occurs in the line resistance. Therefore, increase the oil gas G passing through the connecting pipe 21 having a large resistance,
The flow rate is adjusted by the flow rate adjusting orifice 61 so as to limit the flow rate in the path having a small resistance.

By using the flow rate balance adjusting means of the present embodiment, it is possible to eliminate the inconvenience that some of the oil gas G stays in the bearing housing 3, and the oil gas G is always stable.
Can be recovered.

[0032]

As is apparent from the above description, according to the present invention, since the communication pipe that connects the inside of the bearing box and the inside of the oil tank is provided independently of the lubricating oil circulation path, the oil gas flows through the return oil pipe. Therefore, it is not necessary to form the gas phase portion, and the return oil pipe can be configured by a thin pipe line that flows an appropriate amount of lubricating oil equivalent to the oil supply pipe.

Therefore, the installation height of the oil tank can be freely determined within the range where the lubricating oil naturally flows down, and also the way of laying the return oil pipe can be freely determined.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an oil gas recovery device according to the present invention.

FIG. 2 is a vertical sectional view showing details of the bearing box shown in FIG.

FIG. 3 is a configuration diagram showing another embodiment of the present invention.

FIG. 4 is a configuration diagram showing another embodiment of the present invention.

FIG. 5 is a configuration diagram showing another embodiment of the present invention.

FIG. 6 is a configuration diagram showing another embodiment of the present invention.

FIG. 7 is a configuration diagram showing another embodiment of the present invention.

FIG. 8 is a configuration diagram showing an example of a conventional technique.

FIG. 9 is a sectional view showing an example of a conventional technique.

FIG. 10 is a configuration diagram showing an example of a conventional technique.

[Explanation of symbols]

 1 ... Rotary shaft 2 ... Bearing 3 ... Bearing box 11 ... Oil supply pipe 12 ... Oil return pipe 14 ... Oil tank 12 ... Air extraction pipe 13 ... Blower 14 ... Oil gas recovery filter 21 ... Communication pipe 31, 32 ... Fan 41 ... Gas Cooler 52 ... Controller 61 ... Flow rate adjusting orifice

Claims (6)

[Claims] 1. A bearing box containing a bearing for supporting a rotating shaft is provided, and a circulation path is provided between the oil tank and the bearing so that lubricating oil is sent from the oil tank to the bearing and is collected through the bearing box. In the structure, a communication pipe for oil gas that communicates the inside of the bearing box and the inside of the oil tank is provided independently of the lubricating oil circulation path, and is extracted from the gas phase portion inside the oil tank. An oil / gas recovery device, which is provided with an air extraction pipe for guiding oil gas to an oil / gas recovery filter. 2. The oil gas according to claim 1, wherein the air extraction pipe is provided with a blowing unit to forcibly feed the oil gas in the oil tank to the oil gas recovery filter. Recovery device. 3. A fan is provided on the rotary shaft in the bearing box, air is sucked from a gap between the bearing box and the rotary shaft, and is sent to the oil gas recovery filter together with oil gas through the oil tank. The oil gas recovery device according to claim 1, wherein 4. A fan is provided on the rotary shaft adjacent to the bearing box, air is pushed into the bearing box from a gap between the bearing box and the rotary shaft, and the oil is passed through the oil tank together with oil gas. The oil / gas recovery device according to claim 1, wherein air is supplied to the gas recovery filter. 5. The oil gas recovery device according to claim 2, wherein the air extraction pipe is provided with a gas cooler. 6. The oil-gas recovery device according to claim 2, further comprising a controller for adjusting the rotation speed of the blower according to the amount of gas flowing through the air extraction pipe.