JP4714009B2 - Oil mist splash prevention system for rotating machinery - Google Patents

Description

  The present invention prevents splashing of oil mist generated in the bearing unit of a rotary machine such as a blower, a compressor, and a pump that rotatably supports a rotor by a bearing unit lubricated with lubricating oil, The present invention relates to a system for preventing foreign matters such as dust from entering the bearing unit from the outside.

  Rotary machines such as rotary blowers, compressors, and pumps rotate the impeller attached to the rotor to boost the pressure of gas or liquid. However, the rotor is rotated at high speed, so it is rotated. Oil-lubricated bearings are mainly used as bearings that are freely supported.

  By the way, the lubrication system of the bearing can be lubricated by an oil bath lubrication type in which at least a part of the bearing is immersed in lubricating oil stored in an oil bath (oil bath) in the bearing unit to lubricate the bearing, or by a lubrication pump. There is a forced circulation lubrication system that forcibly supplies oil into the bearing unit to lubricate the bearing, and an appropriate lubrication system is appropriately employed depending on the operating conditions.

  In a bearing unit of a rotating machine having a bearing that employs a lubrication method such as the oil bath lubrication method or the forced circulation lubrication method, since the rotor rotates at a high speed, oil mist is generated in the bearing unit. Environmental pollution such as passing through gaps such as labyrinths that are shaft seals and leaking out of the bearing unit, contaminating nearby facilities, and contaminating the air in buildings where blowers and compressors are installed There was a problem of causing.

  As means for solving the above problems, the inside of the bearing unit is held at a negative pressure by a suction fan such as a vapor fan, the oil mist drawn by the suction fan is guided to the discharge pipe, and an oil mist separator connected to the outlet of the discharge pipe is used. A method for removing oil from an oil mist has been proposed (see, for example, Patent Document 1).

  However, according to the above-described method, a suction fan and a driving source such as an electric motor for driving the suction fan are separately required, which causes another problem of increasing the size and cost of the equipment.

  Accordingly, the present applicant has previously proposed an oil mist scattering prevention system that can reliably prevent oil mist from scattering with a simple configuration at low cost without requiring special equipment (see Patent Document 2). An example of this oil scattering prevention system will be outlined based on FIG.

  FIG. 11 is an overall configuration diagram of a rotating machine including an oil splatter prevention system. In the illustrated rotating machine 101, a rotor 103 passes through a main body casing 102, and the rotor 103 includes a main casing 102. A housed impeller (not shown) is attached.

  Further, both end portions of the rotor 103 extending outside the main body casing 102 are rotatably supported by bearing units 108 and 109, and one end of the rotor 103 is directly connected to an electric motor 110 as a driving source. Yes.

  Thus, the oil splatter prevention system is configured by connecting the inside of both bearing units 108 and 109 to the suction nozzle 104 by the suction pipes 133 and 134 and providing the oil mist separator 135 in the middle of the suction pipe 134 which is the connection path. Has been.

  In the rotating machine 101 equipped with the oil scattering prevention system, when the rotor 103 is driven to rotate at high speed by the electric motor 110, the impeller (not shown) attached to the rotor 103 also rotates at high speed in the main body casing 102. Air is sucked from the suction pipe 106 through the suction nozzle 104 to increase the pressure, and the pressurized air is discharged from the discharge nozzle 105 to the discharge pipe 107. When the rotary machine 101 is driven in this way, the suction air flows at high speed in the suction nozzle 104, and thus the pressure in the suction nozzle 104 becomes negative.

  On the other hand, when the rotor 103 rotates at high speed in the bearing units 108 and 109, oil mist is generated in the bearing units 108 and 109, but the suction units 133 and 134 are disposed in the bearing units 108 and 109 communicating with each other. Since the oil mist generated in the bearing units 108 and 109 is drawn by the negative pressure in the suction nozzle 104, the suction pipes 133 and 134 are connected to each other through the oil mist separator 135 and the suction nozzle 104. It flows in the direction of the arrow shown in the figure and is guided to the oil mist separator 135, where oil is removed from the oil mist separator 135, and only clean air from which oil has been removed is sucked into the suction nozzle 104 through the suction pipe 134 and others. The compressed air is used in the main casing 102 together with the intake air.

Therefore, according to the oil scattering prevention system, the negative pressure generated in the rotating machine 101 itself (the negative pressure in the suction nozzle 104) is used as a negative pressure source for sucking the oil mist generated in the bearing units 108 and 109. Therefore, it is not necessary to provide a separate facility such as a suction fan or a driving source for driving the suction fan, and oil mist generated in the bearing units 108 and 109 can be reliably prevented with a simple configuration without causing an increase in cost. be able to.
Japanese Patent Laid-Open No. 9-173736 JP 2004-251378 A

  However, in the conventional oil splattering prevention system shown in FIG. 11, the bearing units 108 and 109 are directly communicated with the suction nozzle 104, which is a negative pressure generating portion, so that the bearing units 108 and 109 have negative pressure, and dust or moisture In an environment with a large amount of dust, dust and moisture (moisture) are sucked into the bearing units 108 and 109 from a shaft seal portion such as a labyrinth that seals a portion through which the rotor 103 of the bearing units 108 and 109 passes, and these are sucked into the bearing units 108 and 109. There is a possibility that the lubricating oil in 108 and 109 may be contaminated and the bearings, the rotor 103 and the like may be worn.

  The present invention has been made in view of the above problems, and the object of the present invention is to reliably prevent the oil mist from being scattered, and in a dust and moisture bearing unit even in an environment with a lot of dust and moisture. It is an object of the present invention to provide an oil mist scattering prevention system for a rotating machine that can prevent contamination of a bearing unit and wear of a bearing, a rotor, etc.

In order to achieve the above object, the invention according to claim 1 is generated in the bearing unit of a rotating machine in which a rotor is rotatably supported by a bearing unit that uses gas as a working fluid and is lubricated by lubricating oil. A system that prevents the oil mist from scattering is attached to the bearing unit by a cover that surrounds the rotor penetrating portion of the bearing unit, and the space formed in the cover is used to prevent the negative pressure generating part of the rotating machine or the flow of the discharge gas from flowing. An ejector that generates a negative pressure by using an oil mist is connected, an oil mist separation means is provided in the middle of the connection path, a pressure adjustment valve is provided downstream of the oil mist separation means, and a negative pressure generation portion of the rotating machine Alternatively , a pressure adjusting valve is provided on the upstream side of the ejector in the connection path between the discharge gas and the ejector .

According to a second aspect of the present invention, in the first aspect, the suction side and the discharge side of the rotary machine connected with the vent pipe, characterized in that a said ejector in the middle of the vent tube.

According to the first aspect of the present invention, the space formed in the cover is connected to the negative pressure generating portion of the rotating machine or the ejector that generates the negative pressure using the flow of the discharge gas, and the middle of the connection path. Since the oil mist separating means is provided in the cover unit, the pressure in the space in the cover becomes negative, and the oil mist generated in the bearing unit and the dust and moisture outside the bearing unit are sucked into the space in the cover and become oil. The oil is guided to the mist separating means, and the oil is removed by the oil mist separating means. Therefore, the oil mist does not leak out of the bearing unit, and the problem of contamination by the oil mist is solved. Also, even in an environment where there is a lot of dust and moisture, the dust and moisture do not enter the bearing unit, the lubricating oil is contaminated by the dust and moisture that has entered the bearing unit, and the bearing and rotor are worn. The problem of being promoted does not occur.

Further, as the negative pressure generating means, the negative pressure generated in the negative pressure generating part or ejector of a rotary machine such as a blower or a compressor that uses gas as a working fluid is used , so that a suction fan or a drive for driving the suction fan is used. It is not necessary to separately provide equipment such as a power source, and it is possible to reliably prevent the oil mist from scattering and the entry of dust and moisture into the bearing unit with a simple configuration without incurring an increase in cost.

Furthermore, since a pressure regulating valve is provided downstream of the oil mist separating means, the negative pressure generated in the space by adjusting the flow rate through the connection path of air containing oil mist and dust from the space in the cover. The pressure of the space in the cover (negative pressure) can be set to any appropriate value. In addition, since the pressure regulating valve is provided upstream of the ejector in the negative pressure generating part of the rotating machine or the connection path between the ejected gas and the ejector, the flow rate of the ejected gas flowing through the ejector is adjusted by the pressure regulating valve and generated in the ejector. The magnitude of the negative pressure can be adjusted, and the pressure (negative pressure) in the space in the cover can be set to any appropriate value.

According to the second aspect of the present invention, since the blower and high pressure rotary machine of the compressor such as the discharge side and the low suction side of pressure connected with the vent pipe, toward the suction side of the vent pipe from the discharge side As a result, the flow rate of the discharged gas increases, and as a result, a high negative pressure is generated in the ejector, and oil mist generated in the bearing unit, dust and moisture in the atmosphere are sucked more effectively into the space in the cover. In addition, it is possible to more reliably prevent dust and moisture from entering the bearing unit from the oil mist.

Reference examples and embodiments of the present invention will be described below with reference to the accompanying drawings.

< Reference example >
Figure 1 is an overall configuration diagram of a rotary machine comprising an oil mist scattering prevention system according to a reference example of the present invention, FIG 2 is a side sectional view of the anti-motor side bearing unit, Figure 3 is a side sectional view of the motor-side bearing unit .

  A rotating machine 1 shown in FIG. 1 includes a blower, a compressor, a pump, and the like, and a rotatable rotor 3 passes through the main body casing 2, and the main body casing 2 is inserted into the rotor 3. An impeller (not shown) housed inside is attached. Further, suction nozzles 4 and discharge nozzles 5 are integrally protruded downward at both ends in the longitudinal direction of the main body casing 2, and the suction pipe 6 and the discharge nozzle 5 are connected to the suction nozzle 4 and the discharge nozzle 5, respectively. Tubes 7 are connected to each other.

  Further, both end portions of the rotor 3 extending outside the main body casing 2 are rotatably supported by bearing units 8 and 9, and one end of the rotor 3 is directly connected to an electric motor 10 which is a driving source. Yes.

  Here, the configuration of the bearing unit 8 on the side opposite to the motor will be described with reference to FIG.

  The bearing unit 8 on the non-motor side employs an oil bath lubrication method as a lubrication method, and is configured to accommodate a ball bearing 12 that is a rolling bearing in a bearing case 11. The bearing case lid 13 and the shaft end lid 14 are respectively closed, and an oil bath (oil bath) 15 is formed inside the bearing case 11. The lubricating oil is stored in the oil bath 15, and the lower part of the ball bearing 12 is immersed in the lubricating oil (in the illustrated example, the oil level of the lubricating oil is a ball below the ball bearing 12. 12a center level). An oil drain pipe 16 that opens into the oil bath 15 is connected to the lower portion of the bearing case 11.

  One end of the rotor 3 on the side opposite to the motor passes through the bearing case lid 13 and is rotatably supported by the ball bearing 12 in the bearing case 11. A portion where the rotor 3 penetrates the bearing case lid 13 is sealed (shaft sealed) by a labyrinth 17.

Thus, in the present reference example , a cover 18 surrounding the labyrinth 17 is attached to the bearing case lid 13 of the bearing unit 8, and the cover 18 is interposed between the bearing case lid 13 and the cover 18. A space S1 is formed. A portion of the cover 18 through which the rotor 3 passes is sealed with a labyrinth 19.

  Next, the configuration of the motor-side bearing unit 9 will be described with reference to FIG.

  The bearing unit 9 on the motor side also adopts an oil bath lubrication method as a lubrication method, and the rotor 3 penetrates inside the bearing unit 9, and in the bearing case 20, two ball bearings 21 which are rolling bearings, 22 is accommodated. The opening end face of the bearing case 20 is closed by detachable bearing case lids 23 and 24, respectively, and an oil bath (oil bath) 25 is formed inside the bearing case 20. Lubricating oil is stored in the oil bath 25, and the lower portions of the ball bearings 21 and 22 are immersed in the lubricating oil. An oil drain pipe 26 that opens into the oil bath 25 is connected to the lower portion of the bearing case 20.

  The other end of the rotor 3 on the motor side is rotatably supported by the ball bearings 21 and 22 in the bearing case 20 through the bearing case lids 23 and 24. The portions where the rotor 3 penetrates the bearing case lids 23 and 24 are sealed by labyrinths 27 and 28, respectively.

Thus, in this reference example , covers 29 and 30 surrounding the labyrinths 27 and 28 are attached to the bearing case lids 23 and 24 of the bearing unit 9, respectively. Inside, space portions S2 and S3 are formed between the bearing case lids 23 and 24, respectively. And the site | part which the rotor 3 of each cover 29 and 30 penetrates is sealed with the labyrinth 31 and 32, respectively.

Next, an oil mist scattering prevention system according to this reference example will be described.

The space S1 formed in the cover 18 of the bearing unit 8 on the side opposite to the motor shown in FIG. 2 and the spaces S2 and S3 formed in the covers 29 and 30 of the bearing unit 9 on the motor side shown in FIG. As shown in FIG. 1, the suction pipe 33 communicates with each other, and a suction pipe 34 is branched from the middle of the suction pipe 33. The suction pipe 34 includes an oil mist as oil mist separating means. vacuum pump 37 is connected a negative pressure generator via a separator 35 and a pressure regulating valve 36. Accordingly, the space S1 of the bearing unit 8 and the spaces S2 and S3 of the bearing unit 9 are communicated with the vacuum pump 37 via the suction pipes 33 and 34, the oil mist separator 35 and the pressure adjustment valve 36.

  Here, as shown in FIG. 2, one end of the suction pipe 33 is connected to the upper portion of the cover 18 and opens into the space S1, and the other end of the suction pipe 33 is connected to the upper part of the cover 18 as shown in FIG. Are connected to the upper portions of the covers 29 and 30, respectively, and open to the spaces S2 and S3, respectively.

  In the above, when the rotor 3 of the rotating machine 1 is driven to rotate at high speed by the electric motor 10, the impeller (not shown) attached to the rotor 3 also rotates at high speed in the main body casing 2, and fluid such as air or water. Is sucked from the suction pipe 6 through the suction nozzle 4 to increase the pressure, and the pressurized fluid is discharged from the discharge nozzle 5 to the discharge pipe 7.

By the way, when the rotor 3 rotates at high speed in the bearing units 8 and 9, oil mist is generated in the bearing units 8 and 9, but the space portion formed by the cover 18 in the bearing unit 8 as described above. S1 and the spaces S2 and S3 formed by the covers 29 and 30 in the bearing unit 9 communicate with the vacuum pump 37 via the suction pipes 33 and 34, the oil mist separator 35, and the pressure adjustment valve 36, respectively. When the vacuum pump 37 is driven, the spaces S1, S2, S3 are evacuated to become negative pressure, and the oil mist generated in the bearing cases 11, 20 of the bearing units 8, 9 27, 28 and sucked into the spaces S1, S2, S3, respectively. Further, when the rotating machine 1 is installed in an environment where there is a lot of dust and moisture, the surrounding dust and moisture pass through the labyrinths 19, 31, 32 and are sucked into the spaces S 1, S 2, S 3, respectively. These do not pass through the labyrinths 17, 27, 28 and enter the bearing cases 11, 20.

  The oil mist, dust, and moisture sucked into the spaces S1, S2, and S3 flow through the suction pipes 33 and 34 in the direction of the arrow in FIG. 1 and are guided to the oil mist separator 35. Oil is removed, and only clean air from which oil has been removed is sucked into the vacuum pump 37 through the suction pipe 34 and discharged into the atmosphere.

  Accordingly, the oil mist generated in the bearing cases 11 and 20 of the bearing units 8 and 9 does not leak out of the bearing units 8 and 9, and contamination of existing facilities or the like due to the oil mist generated in the past or construction. The problem of causing environmental pollution such as indoor air pollution is solved. Further, even in an environment where there is a lot of dust and moisture, the dust and moisture do not enter the bearing cases 11 and 20 of the bearing units 8 and 9 as described above. Will not be contaminated by dust or moisture, or the wear of the rotor 3 or ball bearings 12, 21, 22 will be accelerated by dust.

In this reference example , since the oil flow is removed by the oil mist separator 35 and the flow rate of the air flowing through the suction pipe 34 is adjusted by the pressure adjusting valve 36, each space S1, S2, S3 of the bearing unit 8-9. The negative pressure inside can be set to an appropriate value.

In this reference example , the vacuum pump 37 is used as the negative pressure generating means. However, as shown in FIG. 4, an ejector 39 that generates a negative pressure may be used instead of the vacuum pump 37. In other words, the ejector 39 is connected to the compressor 50 via the pressure adjustment valve 41, and the compressed air discharged from the compressor 50 is adjusted to an appropriate pressure by the pressure adjustment valve 41 and then supplied to the ejector 39. Then, a negative pressure is generated in the ejector 39 due to the flow of compressed air, and oil mist, dust, and moisture are sucked into the space portions S1, S2, and S3 of the bearing units 8 and 9 by the negative pressure. The mist, dust and moisture flow through the suction pipes 33 and 34 in the direction of the arrow in FIG. 4 and are guided to the oil mist separator 35, where oil is removed from the oil mist separator 35 and only clean air from which oil has been removed is obtained. It is sucked into the ejector 39 through the suction pipe 34.

  If a compressed air pipe for use in other applications is installed near the place where the rotating machine 1 is installed, if the pipe is branched and connected to the ejector 39, a negative pressure is applied to the ejector 39. Therefore, there is no need to provide a dedicated compressor 50.

<Embodiment 1 >
Next, Embodiment 1 of the present invention will be described with reference to FIG.

FIG. 5 is an overall configuration diagram of the rotating machine including the oil mist scattering prevention system according to the first embodiment of the present invention. In FIG. 5, the same elements as those shown in FIG. Hereinafter, description thereof will be omitted.

  The rotating machine 1 shown in FIG. 5 is a blower or a compressor (hereinafter, collectively referred to as “blower”) that uses a gas such as air as a working fluid, and an oil mist scattering prevention system provided therein has a negative pressure. A negative pressure generated in the blower 1 itself (negative pressure in the suction nozzle 4) is used as the generating means, and the other configuration is the same as that shown in the first embodiment.

  That is, the space portion S1 (see FIG. 2) formed in the cover 18 of the bearing unit 8 on the non-motor side and the space portions S2 and S3 (in the covers 29 and 30 of the bearing unit 9 on the motor side, respectively) 3) are connected to each other by a suction pipe 33, and a suction pipe 34 is branched from the middle of the suction pipe 33. The suction pipe 34 is connected to the side of the suction nozzle 4 of the blower 1. And opened in the suction nozzle 4. In the middle of the suction pipe 34, an oil mist separator 35, which is an oil mist separating means, and a pressure adjusting valve 36 are provided. Therefore, the space S1 of the bearing unit 8 and the spaces S2 and S3 of the bearing unit 9 are communicated with the suction nozzle 4 of the blower 1 through the suction pipes 33 and 34, the oil mist separator 35, and the pressure adjustment valve 36. Yes.

  Thus, when the rotor 3 of the blower 1 is rotationally driven at high speed by the electric motor 10, the impeller (not shown) attached to the rotor 3 also rotates at high speed in the main body casing 2, and for example, air is sucked into the suction pipe 6 From the discharge nozzle 5 to the discharge pipe 7. In this case, since the intake air flows through the suction nozzle 4 at a high speed, the pressure is increased. The pressure in the suction nozzle 4 is a negative pressure.

  By the way, when the rotor 3 rotates at high speed in the bearing units 8 and 9, oil mist is generated in the bearing cases 11 and 20 (see FIGS. 2 and 3) of the both bearing units 8 and 9. Thus, the space S1 formed by the cover 18 in the bearing unit 8 and the space portions S2 and S3 formed by the covers 29 and 30 in the bearing unit 9 via the suction pipes 33 and 34 and the oil mist separator 35, respectively. Since the suction nozzle 4 communicates with the suction nozzle 4, the pressures in the spaces S 1, S 2, S 3 are negative, and the oil mist generated in the bearing cases 11, 20 of the bearing units 8, 9 27 and 28 (refer to FIGS. 2 and 3) and sucked into the spaces S1, S2 and S3, respectively. When the blower 11 is installed in an environment where there is a lot of dust and moisture, the surrounding dust and moisture pass through the labyrinths 19, 31 and 32 (see FIGS. 2 and 3) and the space S 1. They are sucked by S2 and S3, respectively, and they do not pass through the labyrinths 17, 27, 28 and enter the bearing cases 11, 20.

  The oil mist, dust and moisture sucked into the spaces S1, S2 and S3 flow in the direction of the arrows through the suction pipes 33 and 34 and are guided to the oil mist separator 35, where oil is removed. Then, only the clean air from which the oil has been removed is sucked into the suction nozzle 4 through the suction pipe 34 and subjected to compression by the blower 1 together with other suction air.

Therefore, in the present embodiment, the same effect as the reference example can be obtained, but in the oil mist scattering prevention system according to the present embodiment, as a negative pressure generating means for sucking oil mist, dust, moisture, etc. Since the negative pressure generating part (negative pressure generating part in the suction nozzle 4) of the blower 1 itself is used, it is not necessary to separately provide a suction fan or a drive source for driving the suction fan, and the cost is not increased. With such a configuration, it is possible to reliably prevent the oil mist from scattering and the entry of dust and moisture into the bearing cases 11 and 20 with certainty.

<Embodiment 2 >
Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 6 is an overall configuration diagram of a rotating machine provided with an oil mist scattering prevention system according to Embodiment 2 of the present invention. In FIG. 6, the same elements as those shown in FIG. Hereinafter, description thereof will be omitted.

  The rotating machine 1 shown in FIG. 6 is also a blower similar to that shown in FIG. 5, and includes a suction vane 38 that rotates together with the rotor 3 on the suction side in the main body casing 2. In the oil mist scattering prevention system provided in the blower 1 according to the present embodiment, the suction pipe 34 is opened in the vicinity of the suction vane 38 in the main body casing 2, and the other configuration is the same as that of the above embodiment. It is the same as that of Form 2.

  Thus, if the suction pipe 34 is opened near the downstream of the suction vane 38 in the main body casing 2 as described above, a larger negative pressure is generated near the downstream of the suction vane 38. The oil mist generated in 9 and the surrounding dust and moisture can be more effectively sucked into the spaces S1, S2, and S3 (see FIGS. 2 and 3) formed in the bearing units 8 and 9, respectively.

<Embodiment 3 >
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 7 is an overall configuration diagram of a blower provided with the oil mist scattering prevention system according to the fourth embodiment. In this drawing, the same elements as those shown in FIGS. 5 and 6 are denoted by the same reference numerals. Hereinafter, description thereof will be omitted.

  The oil mist scattering prevention system according to the present embodiment is characterized by using an ejector 39 as the negative pressure generating means.

  That is, also in the present embodiment, the blower 1 uses air as a working fluid, and the bearing units 8 and 9 employ an oil bath lubrication method as a lubrication method, but pass through the side of the discharge pipe 7. One end of the trachea 40 is connected to open the vent pipe 40 into the discharge pipe 7, the other end of the vent pipe 40 is opened to the atmosphere, and a pressure regulating valve 41 and an ejector 39 are provided in the middle. The bearing units 8 and 9 are connected to an ejector 39 through suction pipes 33 and 34, and an oil mist separator 35 and a pressure adjustment valve 36 are provided in the middle of the suction pipe 34.

  Thus, when the blower 1 is operated, a part of the compressed air pressurized by the blower 1 flows from the discharge pipe 7 through the vent pipe 40 to the ejector 39, so that negative pressure is generated in the ejector 39. To do. As a result, the pressures in the space portions S1, S2, S3 (see FIGS. 2 and 3) formed in the bearing units 8 and 9 become negative, and the bearing cases 11 and 20 (see FIG. 2 and FIG. 3) oil mist generated in the interior and surrounding dust and moisture are sucked into the space portions S1, S2 and S3 of the bearing units 8 and 9, and the oil mist leaks out of the bearing units 8 and 9. The oil mist and the dust and moisture sucked into the space portions S1, S2 and S3 of the bearing units 8 and 9 are not ejected and the surrounding dust and moisture do not enter the bearing cases 11 and 20, respectively. 7 is drawn into the suction pipes 33 and 34 in the direction of the arrow in FIG. 7 and guided to the oil mist separator 35. The oil mist separator 35 removes the oil, and the oil is removed from the clean sky. Only it is discharged into the atmosphere from the vent pipe 40 together with the compressed air through the ejector 39.

Therefore, the present embodiment can provide the same effects as those of the first and second embodiments, but generates a negative pressure that sucks oil mist generated in the bearing units 8 and 9 and surrounding dust and moisture. As the negative pressure generating means, the ejector 39 that generates the negative pressure by the flow of the discharge air is used. Therefore, it is not necessary to separately provide a large facility such as a suction fan or a drive source for driving the suction fan. it can be reliably prevented by a simple structure without increasing the cost entry into the bearing cases within 11, 20 such as dust or moisture scattering and around the oil mist generated.

  In the oil mist scattering prevention system according to the present embodiment, the pressure adjustment valve 41 can adjust the flow rate of the compressed air flowing through the ejector 39 to adjust the magnitude of the negative pressure generated in the ejector 39. The pressure in the space portions S1, S2, S3 of the both bearing units 8, 9 can be set to an appropriate arbitrary value.

<Embodiment 4 >
Next, a fourth embodiment of the present invention will be described with reference to FIG. In addition, FIG. 8 is a whole block diagram of a blower provided with the oil mist scattering prevention system according to the fourth embodiment. In this figure, the same elements as those shown in FIG. The description about them is omitted.

  The oil mist scattering prevention system according to the present embodiment is different from the oil mist scattering prevention system according to the fourth embodiment shown in FIG. 7 in that the discharge pipe 7 and the suction pipe 6 are connected by the ventilation pipe 40. The other configuration is exactly the same as that of the oil mist scattering prevention system according to the fourth embodiment.

  Thus, according to the present embodiment, the discharge pipe 7 having a high pressure and the suction pipe 6 having a low pressure (negative pressure) are connected by the ventilation pipe 40, so that the inside of the ventilation pipe 40 is directed from the discharge side to the suction side. As a result, a high negative pressure is generated in the ejector 39, and oil mist generated in both bearing units 8 and 9 and surrounding dust and moisture are generated in the bearing units 8 and 9. It is more effectively sucked into the spaces S1, S2 and S3 (see FIGS. 2 and 3), and the oil mist is prevented from being scattered and dust and moisture are prevented from entering the bearing cases 11 and 20.

In addition, the present embodiment can provide the same effects as those of the third embodiment. However, in this embodiment, the compressed air that has passed through the ejector 39 is clean from which oil has been removed in the oil mist separator 35. The air is sucked into the suction pipe 6 through the ventilation pipe 40 together with the air, and is used for compression in the blower 1 together with the other suction air.

<Embodiment 5 >
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 9 is an overall configuration diagram of a blower provided with the oil mist scattering prevention system according to the fifth embodiment, FIG. 10 is a sectional view of a bearing unit of the blower, and FIG. 9 is the same as that shown in FIG. Elements are denoted by the same reference numerals, and description thereof will be omitted below.

The oil mist scattering prevention system according to the present embodiment is applied to the blower 1 including the bearing units 8 and 9 adopting a forced circulation lubrication system as a lubrication system, and the basic configuration thereof is as described in the above embodiment. This is the same as that of the oil mist scattering prevention system according to mode 4 .

  Therefore, a forced circulation lubrication type lubrication system will be described here.

  In FIG. 9, reference numeral 42 denotes a lubricating oil tank. An oil supply pipe 43 extending from the lubricating oil tank 42 is connected to the bearing units 8 and 9, and an oil supply pump 44 is provided in the middle of the oil supply pipe 43. The oil drain pipe 45 extending from the lower part of each bearing unit 8, 9 is joined and immersed in the lubricating oil in the lubricating oil tank 42.

  Here, the configuration of the bearing unit 8 on one side (the non-motor side) will be described with reference to FIG. Since the other (motor side) bearing unit 9 has the same configuration as that of the bearing unit 8, illustration and description thereof will be omitted.

  As shown in FIG. 10, the bearing unit 8 is configured by housing a metal bearing 46 that is a sliding bearing in a bearing case 11, and the opening end surface of the bearing case 11 is detachable with a bearing case lid 13 and a shaft end lid 14. Respectively.

  A semicircular groove 46a is formed on the entire outer periphery of the metal bearing 46, and the oil supply pipe 43 is opened in the semicircular groove 46a. The oil drain pipe 45 is connected to the lower part of the bearing case 11, and the oil drain pipe 45 opens at the bottom of the bearing case 11.

  Further, one end of the rotor 3 of the blower 1 passes through the bearing case lid 13 and is rotatably supported by the metal bearing 46 in the bearing case 11. A portion where the rotor 3 penetrates the bearing case lid 13 is sealed (shaft sealed) by a labyrinth 17. Although not shown, the other end of the rotor 3 is also rotatably supported by a metal bearing of the bearing unit 9.

  Further, a cover 18 surrounding the labyrinth 17 is attached to the bearing case lid 13 of the bearing unit 8, and a space portion S <b> 1 is formed in the cover 18 with the bearing case lid 13. Yes. A portion of the cover 18 through which the rotor 3 passes is sealed with a labyrinth 19.

  A suction pipe 33 constituting a part of the oil mist scattering prevention system according to the present invention is connected to the upper portion of the cover 18, and the suction pipe 33 opens into the space S <b> 1 in the cover 18. Yes. Although not shown, the other bearing unit 9 also has the same spaces S2, S3 in the covers 29, 30 as shown in FIG.

  In the above, when the oil supply pump 44 is driven, the lubricating oil in the lubricating oil tank 42 is supplied from the oil supply pipe 43 to the metal bearings 46 (only one shown) of the bearing units 8 and 9. Specifically, for example, in one bearing unit 8, the lubricating oil is sent from the oil supply pipe 43 to the semicircular groove 46a of the metal bearing 46, and the metal bearing 46 passes through the communication hole (not shown) from the semicircular groove 46a. After being supplied to the sliding portion between the rotor 3 and the rotor 3, the oil is supplied to the lubricating oil tank 42 through the oil drain pipe 45. Thereafter, the same operation is repeated, and the metal bearing 46 is forcibly lubricated by continuously circulating lubricating oil.

Thus, as described above, the configuration of the oil mist scatter prevention system according to the present embodiment is the same as that shown in the fourth embodiment. Therefore, the present embodiment also includes the fourth embodiment. The same effect as obtained can be obtained.

In this embodiment, the space portion S1 formed in the bearing unit 8, 9, S2, S3 and is connected to the ejector 39 as a negative pressure generator, negative blower 1 as in the first embodiment The space portions S1, S2 and S3 may be connected to the pressure generating portion (suction nozzle 4 in the example shown in FIG. 5 and downstream of the suction vane 38 in the example shown in FIG. 6).

It is a whole block diagram of a rotary machine provided with the oil mist scattering prevention system which concerns on the reference example of implementation of this invention. It is a sectional side view of the non-motor side bearing unit of the rotary machine which concerns on the reference example of this invention. It is a sectional side view of the motor side bearing unit of the rotary machine which concerns on the reference example of this invention. It is a whole block diagram of the rotary machine which shows the example of a change of the oil mist scattering prevention system concerning the reference example of this invention. It is a whole block diagram of a blower provided with the oil mist scattering prevention system which concerns on Embodiment 1 of this invention. It is a whole block diagram of a blower provided with the oil mist scattering prevention system which concerns on Embodiment 2 of this invention. It is a whole block diagram of a blower provided with the oil mist scattering prevention system which concerns on Embodiment 3 of this invention. It is a whole block diagram of a blower provided with the oil mist scattering prevention system which concerns on Embodiment 4 of this invention. It is a whole block diagram of a blower provided with the oil mist scattering prevention system which concerns on Embodiment 5 of this invention. It is a sectional side view of the anti-motor side bearing unit of the blower which concerns on Embodiment 5 of this invention. It is a whole block diagram of a blower provided with the conventional oil mist scattering prevention system.

Explanation of symbols

1 Rotating machine (blower)
2 body casing 3 rotor 4 suction nozzles 5 discharging nozzle 6 suction pipe 7 a discharge pipe 8, 9 bearing unit 10 electric motor 11 bearing case 12 ball bearing 13 bearing case lid 17 labyrinth 18 cover 19 labyrinth 20 bearing casings 21 ball bearings 23, 24 Bearing case lid 27, 28 Labyrinth 29, 30 Cover 31, 32 Labyrinth 33, 34 Suction pipe (connection path)
35 Oil mist separator (oil mist separation means)
36 Pressure regulating valve 37 Vacuum pump (negative pressure generating means)
38 Suction vane 39 Ejector (negative pressure generating means)
40 Ventilation pipe 41 Pressure regulating valve 46 Metal bearing 50 Compressor S1-S3 Space

Claims (2)

A system for preventing scattering of oil mist generated in the bearing unit of a rotating machine, in which a rotor is rotatably supported by a bearing unit lubricated with lubricating oil using gas as a working fluid,
A cover surrounding the rotor penetrating portion of the bearing unit is attached to the bearing unit, and a space formed in the cover is a negative pressure generating portion of a rotating machine or an ejector that generates a negative pressure by using the flow of discharge gas. An oil mist separation means is provided in the middle of the connection path, a pressure regulating valve is provided downstream of the oil mist separation means, and a connection path between the negative pressure generating part of the rotating machine or the discharge gas and the ejector An oil mist scattering prevention system for a rotating machine, characterized in that a pressure regulating valve is provided upstream of the ejector. Wherein the discharge side of the rotary machine and a suction side connected with the vent pipe, the rotating machine of the oil mist scattering prevention system according to claim 1, characterized by providing the ejector in the middle of the vent tube.

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