JP2022116566A - Lubricating oil splash prevention device and rotary machine - Google Patents

Abstract

To provide a lubricating oil splash prevention device that can prevent lubricating oil from splashing to the outside.SOLUTION: A lubricating oil splash prevention device 100 comprises a cover part 101 covering one end part of a seal member 50, and a cylindrical part 102 extending toward a casing 5 from the cover part 101, and covering a rotating shaft 1.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a lubricating oil splash prevention device and a rotating machine.

A pump is a rotating machine that pumps a liquid such as water by rotating an impeller arranged in a casing. A pump generally includes a casing having a suction port and a discharge port, an impeller disposed inside the casing, and a rotating shaft to which the impeller is fixed. When the impeller rotates together with the rotating shaft, the liquid is sucked through the suction port of the casing. The liquid is pressurized in the casing as the impeller rotates and is discharged from the discharge port.

The rotary shaft is rotatably supported by bearings. The bearings are housed in bearing housings located adjacent to the casing. Lubricating oil for lubricating and cooling the bearing is stored in the bearing housing, and the lower part of the bearing is immersed in the lubricating oil. As the inner ring of the bearing rotates, lubricating oil is supplied throughout the bearing.

JP-A-8-100797 JP-A-11-82374 Japanese Patent Application Laid-Open No. 2001-12387 JP-A-2002-227797 JP 2015-169188 A

Since the rotating shaft extends through the bearing housing, a gap necessarily exists between the outer peripheral surface of the rotating shaft and the bearing housing. Therefore, a sealing member is provided between the outer peripheral surface of the rotating shaft and the bearing housing in order to prevent the leakage of lubricating oil from this gap.

However, even if such a sealing member is provided, a small amount of lubricating oil may leak from this gap. The leaked lubricating oil comes into contact with the rotating shaft and is scattered around by centrifugal force. As a result, there is a risk that the surroundings of the rotating machine will become dirty with the spattered lubricating oil.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lubricating oil scattering prevention device and a rotating machine that can prevent lubricating oil from scattering to the outside.

In one aspect, there is provided a lubricating oil scattering prevention device that prevents lubricating oil of the bearing device from scattering from a rotating shaft extending to the bearing device through a casing in which an impeller is housed. The lubricating oil scattering prevention device includes a cover portion that covers one end of a seal member that prevents the lubricating oil from leaking from the bearing device to the casing side, and covers the rotating shaft that extends from the cover portion toward the casing. and a barrel.

In one aspect, the cover part has an opening for passing the rotating shaft, and the cylindrical part extends from the opening along the rotating shaft.
In one aspect, the lubricating oil splash prevention device is formed between a bent portion and the rotating shaft, which is larger than a gap between the cylindrical portion and the rotating shaft and is formed at a position adjacent to the bearing device. has a gap of
In one aspect, the cover portion is fixable to the bearing device.

In one aspect, each of the cover portion and the tubular portion has a split structure.
In one aspect, each of the cover portion and the cylinder portion is divided into two along the vertical direction.
In one aspect, the tubular portion is detachably connected to the cover portion.

In one aspect, the lubricating oil splash prevention device has a length adjustment mechanism.
In one aspect, the length adjustment mechanism has an elongated hole extending in the axial direction of the rotating shaft and formed in a connecting portion between the cover portion and the cylinder portion. are connected by fasteners inserted into the slots and are movable in the axial direction through the slots.
In one aspect, the length adjusting mechanism corresponds to a fitting mechanism including the cylindrical portion that fits together and a connection portion between the cover portion and the cylindrical portion.

In one aspect, a bearing that houses an impeller, a casing that houses the impeller, a rotating shaft to which the impeller is fixed, a bearing that rotatably supports the rotating shaft, and stores lubricating oil A rotary machine is provided comprising: a device, and the lubricating oil anti-scattering device that prevents the lubricating oil of the bearing device from scattering.

In one aspect, the bearing device includes a cover member arranged adjacent to the bearing, the bent portion has an upper end and a lower end with an opening, and the cylindrical portion has an opening. is formed, and an inner wall of the cover member with which the lubricating oil collides outside the opening formed by the tip, the upper end and the lower end in the axial radial direction of the rotating shaft exists.
In one aspect, the rotating machine includes a shaft sealing device that seals a gap between the rotating shaft and the casing, and the cylindrical portion is arranged inside an adjustment bolt of the shaft sealing device. ing.

The lubricating oil leaking from the bearing device scatters due to the centrifugal force of the rotating shaft, and the splattered lubricating oil collides with the inner surface of the lubricating oil anti-scattering device and/or the cover member covering the lubricating oil anti-scattering device. Therefore, the lubricating oil scattering prevention device can prevent the lubricating oil from scattering to the outside of the rotating machine.

1 is a cross-sectional view of an embodiment of a pumping device; FIG. 1 is a perspective view of a lubricating oil splash prevention device; FIG. FIG. 4 is a view showing a lubricating oil splash prevention device fixed to a cover member of a bearing device; It is a figure which shows the flow of the lubricating oil which collided with the inner surface of a lubricating oil splash prevention apparatus. It is a figure which shows other embodiment of a lubricating-oil splashing prevention apparatus. FIG. 6 is a cross-sectional view taken along line AA of FIG. 5; It is a figure which shows the lubricating oil splash prevention apparatus which has a length adjustment mechanism. FIG. 10 is a diagram showing another embodiment of the barrel; FIG. 9 is a cross-sectional view of the lubricating oil scattering prevention device having the tubular portion according to the embodiment shown in FIG. 8 ; Fig. 10 shows another embodiment of a pumping device;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments described below, a pump will be described as an example of a rotating machine, but the rotating machine is not limited to a pump. Other examples of rotating machines include compressors and blowers.

FIG. 1 is a cross-sectional view showing one embodiment of a pump device. A pump device PA as a rotary machine shown in FIG. 1 includes a pump PA1 and a drive device PA2. The pump PA1 includes an impeller 2, a rotating shaft 1 to which the impeller 2 is fixed, and a casing (in this embodiment, a pump casing) 5 in which the impeller 2 is housed. The rotating shaft 1 extends horizontally, and the axial direction CL of the rotating shaft 1 coincides with the horizontal direction.

One end of the rotating shaft 1 is connected to a driving machine 10 such as an electric motor (more specifically, a driving shaft 10a of the driving machine 10), and the driving machine 10 rotates the rotating shaft 1 and the impeller 2. The driving machine 10 is at least part of the components of the driving device PA2.

The pump casing 5 shown in FIG. 1 has a swirl chamber 5a therein, and the impeller 2 is arranged inside the swirl chamber 5a. When the impeller 2 rotates together with the rotating shaft 1 , liquid such as water is sucked through the suction port 3 , the pressure of the liquid is increased by the action of the impeller 2 and the spiral chamber 5 a , and the liquid is discharged from the discharge port 4 .

The rotating shaft 1 extends through the pump casing 5 . A gap between the rotating shaft 1 and the pump casing 5 is sealed by a shaft sealing device (mechanical seal in this embodiment) 11 . The shaft sealing device 11 can prevent leakage of liquid in the pump casing 5 from the gap between the pump casing 5 and the rotating shaft 1 .

A rotating shaft 1 is supported by a bearing device 9 . The bearing device 9 includes bearings 9A and 9B that rotatably support the rotating shaft 1, and a bearing housing 36 that accommodates the bearings 9A and 9B. In this embodiment, the bearings 9A, 9B are rolling bearings. Lubricating oil is stored inside the bearing housing 36 . The liquid surface of the lubricating oil in the bearing housing 36 is positioned below the rotating shaft 1 .

The bearings 9A, 9B have the same construction. Each of the bearings 9A and 9B includes an outer ring 30 fixed to a bearing housing 36, an inner ring 31 fixed to the outer peripheral surface of the rotating shaft 1, and a plurality of rolling elements 32 arranged between the outer ring 30 and the inner ring 31. and have. When the inner ring 31 rotates together with the rotating shaft 1 , the multiple rolling elements 32 rotate between the outer ring 30 and the inner ring 31 . The lower portions of bearings 9A and 9B are immersed in lubricating oil. Therefore, when the inner ring 31 rotates together with the rotating shaft 1, lubricating oil is supplied to the entire bearings 9A and 9B.

The bearing housing 36 includes a housing body 38 holding lubricating oil, and cover members 37A and 37B that close open ends on both sides of the housing body 38 . A cover member 37A arranged adjacent to the bearing 9A covers the shaft seal device 11 while closing one open end of the housing body 38 . A cover member 37B arranged adjacent to the bearing 9B closes the other open end of the housing body 38. As shown in FIG. The rotating shaft 1 extends through the cover members 37A and 37B.

When the rotating shaft 1 rotates due to the operation of the pump device PA, the lubricating oil in the bearing housing 36 is supplied to the bearings 9A and 9B. A part of the lubricating oil supplied to each of bearings 9A and 9B passes through each of bearings 9A and 9B and flows toward cover members 37A and 37B. Therefore, the bearing device 9 includes seal members 50, 50 for preventing the lubricant from leaking from the gaps between the cover members 37A, 37B and the rotary shaft 1. As shown in FIG.

Each of the seal members 50, 50 is adjacent to each of the bearings 9A, 9B. The seal members 50, 50 have the same structure. Examples of the sealing member 50 include an oil seal and a deflector. The seal member 50 adjacent to the bearing 9A is configured to prevent the lubricant from leaking from the bearing device 9 to the pump casing 5 side, and the seal member 50 adjacent to the bearing 9B prevents the lubricant from leaking from the bearing device 9. It is configured to prevent leakage to the outside.

However, a small amount of the lubricating oil leaks from between the rotating shaft 1 and the seal member 50, and the leaked lubricating oil may scatter due to the centrifugal force of the rotating rotating shaft 1 and contaminate the surroundings of the pump device PA. be.

Therefore, the pump device PA includes a lubricating oil scattering prevention device 100 that prevents the lubricating oil leaking from the bearing device 9 to the pump casing 5 side from scattering to the outside of the pump device PA. The structure of the lubricating oil scattering prevention device 100 will be described below with reference to the drawings.

FIG. 2 is a perspective view of the lubricating oil splash prevention device. FIG. 3 is a diagram showing a lubricating oil splash prevention device fixed to a cover member of a bearing device. As shown in FIGS. 2 and 3, the lubricating oil scattering prevention device 100 includes a cover portion 101 that covers one end portion of the seal member 50, and a cylindrical portion that covers the rotating shaft 1 and extends from the cover portion 101 toward the pump casing 5. 102 and. The cylindrical portion 102 is connected to the cover portion 101 and extends along the axial direction CL of the rotating shaft 1 . Further, the cover portion 101 has an opening portion 101a through which the rotating shaft 1 is passed, and the tubular portion 102 extends from the opening portion 101a along the rotating shaft 1 toward the casing 5 .

As shown in FIG. 2, the lubricating oil splash prevention device 100 has a split structure. More specifically, each of the cover portion 101 and the tubular portion 102 is divided into two along the vertical direction. One side of the lubricating oil scattering prevention device 100 having a split structure is a first split structure 100A, and the other is a second split structure 100B. The first divided structure 100A and the second divided structure 100B preferably have the same structure. As one embodiment, each of the cover portion 101 and the cylindrical portion 102 may be divided into two along the vertical direction, or may be divided into two along the vertical direction or a predetermined angle from the vertical direction.

The cover portion 101 can be fixed to the bearing device 9 (more specifically, the cover member 37A). The cover portion 101 includes a cover body 105 to which the tubular portion 102 is connected, a bent portion 107 connected to the cover body 105 , and an attachment portion 106 connected to the bent portion 107 .

The cover body 105 extends perpendicular to the axial direction CL of the rotating shaft 1, the bent portion 107 extends parallel to the axial direction CL, and the mounting portion 106 extends perpendicular to the axial direction CL. The cover body 105, the bent portion 107, and the mounting portion 106 are integrally formed members, and are preferably manufactured by bending a single plate. As a result, the lubricating oil can be prevented from leaking from the seams of the cover main body 105 .

In this embodiment, by providing the bent portion 107, the cover body 105 forms a gap S1 (see FIG. 3) between the cover body 105 and the seal member 50. As shown in FIG. Here, when the lubricating oil reaches the cylindrical portion 102, it may leak from the tip portion 102a. Therefore, in the lubricating oil scattering prevention device 100 of the present embodiment, the cross-sectional area in the axial radial direction between the bent portion 107 and the rotating shaft 1 is wider than the cross-sectional area between the cylindrical portion 102 and the rotating shaft 1 (that is, Distance L1>L2 in FIG. 3) The gap S1 is provided at a position adjacent to the bearing device 11. Here, the distance L1 is the distance between the bent portion 107 and the rotating shaft 1, and the distance L2 is the distance between the tubular portion 102 and the rotating shaft 1. As described above, the lubricating oil splashing prevention device 100 includes the bent portion 107 formed at a position adjacent to the bearing device 11 and larger than the gap S2 between the cylindrical portion 102 and the rotating shaft 1, and the rotating shaft 1. has a gap S1 between

As a result, most of the lubricating oil leaking from the bearing device 9 is blown in the axial radial direction by the centrifugal force in the gap S1, and as a result collides with the cover main body 105 and/or the bent portion 107. As shown in FIG. As a result, it is possible to suppress the lubricating oil from reaching the cylindrical portion 102 . In addition, the lubricating oil scattering prevention device 100 in which the gap S1 is formed has a structure that is open in the vertical direction. preferably. In this embodiment, the cover portion 101 has a square shape when viewed from the axial direction, but the shape is not limited to this shape. In one embodiment, the cover portion 101 may be circular or polygonal when viewed from the axial direction. Even in this case, it is preferable that the cover portion 101 has a shape in which an opening is formed at the lower end and a gap is formed between the cover portion 101 and the sealing member 50 . Here, the upper end 100 a and the lower end 100 b correspond to the upper end and the lower end of the bent portion 107 .

Each of the multiple mounting portions 106 has a fastening hole 111 into which the fastener 110 can be inserted. The fastener 110 is a fastening member such as a screw for fastening the lubricating oil scattering prevention device 100 to the cover member 37A.

When mounting the lubricating oil scattering prevention device 100, the operator brings the first split structure 100A and the second split structure 100B close to each other, and the first split structure 100A and the second split structure 100B. Sandwich the rotating shaft 1 with In this state, by inserting the fastener 110 into the fastening hole 111 of the mounting portion 106 and tightening it, the lubricating oil splashing prevention device 100 is configured to connect the seal member 50 and the exposed portion of the rotating shaft 1 (that is, the inside of the cover member 37A). part of the rotating shaft 1 exposed in ) and . By configuring the lubricating oil anti-scattering device 100 from the first split structure 100A and the second split structure 100B, the operator can easily mount the lubricating oil anti-scattering device 100 . That is, the lubricating oil splash prevention device 100 can be attached and detached without removing other parts.

According to the present embodiment, by providing the lubricating oil scattering prevention device 100, the lubricating oil leaking from the seal member 50 is released from the inner surface of the lubricating oil scattering prevention device 100 by the centrifugal force generated by the rotation of the rotating shaft 1 in the space S1. collide with and fall downwards. As a result, the lubricating oil scattering prevention device 100 can prevent the lubricating oil from splashing around.

FIG. 4 is a diagram showing the flow of lubricating oil that collides with the inner surface of the lubricating oil scattering prevention device. As shown in FIG. 4, the lubricating oil scattering prevention device 100 is arranged inside the cover member 37A. A drain hole 39 is formed at the bottom of the cover member 37A. Therefore, the lubricating oil colliding with the inner surface of the lubricating oil scattering prevention device 100 moves to the outside of the lubricating oil scattering prevention device 100 through the lower end 100b (and the upper end 100a) of the lubricating oil scattering prevention device 100, and is discharged from the drain hole 39. be done. Below the drain hole 39, for example, a mechanism for draining oil such as a drain pan 40 is provided. In this way, the lubricating oil leaking from the seal member 50 is discharged from the drain hole 39 through the cover member 37A, so that the surroundings of the pump device PA are not contaminated by the scattering of the lubricating oil.

For maintenance of the shaft sealing device 11, the cover member 37A is formed with an opening 37A1 having a size that allows access by an operator (see FIG. 1). By forming the opening 37A1, the operator can easily access the shaft sealing device 11, so that the maintainability of the shaft sealing device 11 is improved. On the other hand, if an operator accesses the shaft sealing device 11 through the opening while the rotating shaft 1 is rotating, there is a possibility that a contact accident with the rotating shaft 1 may occur.

According to this embodiment, as shown in FIG. covering. Therefore, the operator can safely perform maintenance (for example, retightening the gland packing) of the shaft sealing device 11 without contacting the rotating shaft 1 during rotation.

Further, as shown in FIG. 1, the tip portion 102a is arranged closer to the shaft sealing device 11 than the opening 37A1. An upper end 100a and a lower end 100b (that is, an opening formed by the upper end 100a and/or the lower end 100b) of the lubricating oil scattering prevention device 100 are arranged closer to the bearing housing 36 than the opening 37A1. That is, the inner wall of the cover member 37A exists outside the opening formed by the tip portion 102a, the upper end 100a and the lower end 100b in the axial radial direction. As a result, the lubricating oil leaking from any of the openings formed by the tip portion 102a, the upper end 100a and the lower end 100b reaches the inner wall of the cover member 37A located outside in the axial radial direction due to centrifugal force or gravity. As a result, the lubricating oil can reach the drain hole 39 . That is, the lubricating oil scattering prevention device 100 of the present embodiment can prevent the lubricating oil from scattering to the outside from the maintenance opening 37A1.

Further, as shown in FIG. 3, in the present embodiment, the cylindrical portion 102 has a cylindrical shape arranged concentrically with the rotating shaft 1 . However, the cylindrical portion 102 may have any other shape as long as it covers the rotating shaft 1 from the opening 101a to the immediate vicinity of the shaft sealing portion 11 . As one embodiment, the cylindrical portion 102 may have a polygonal cross section in the axial radial direction, or a truncated cone or truncated pyramid whose cross section in the axial radial direction is smaller at the tip portion 102a of the cylindrical portion 102 than at the opening portion 101a. may have the shape of If the cylindrical portion 102 is a truncated cone or a truncated pyramid, it is possible to guide the lubricating oil scattered at the tip portion 102a to the opening portion 101a side. As a result, the scattered lubricating oil can be recovered more effectively. Specifically, the scattered lubricating oil can be collected in the drain hole 39 more effectively.

FIG. 5 is a diagram showing another embodiment of the lubricating oil splash prevention device. 6 is a cross-sectional view taken along the line AA of FIG. 5. FIG. As shown in FIGS. 5 and 6 , the tubular portion 102 may be detachably connected to the cover portion 101 . The cover portion 101 has a connection portion 108 connected to the cover body 105 . The connecting portion 108 extends parallel to the tubular portion 102 and protrudes toward the tubular portion 102 .

As shown in FIG. 6, the connection part 108 has an insertion hole 121 into which a fastener 120 such as a screw can be inserted, and the cylindrical part 102 has a communication hole 122 through which the insertion hole 121 can communicate. there is The operator arranges cylindrical portion 102 (more specifically, a semi-cylindrical divided body that constitutes cylindrical portion 102) so as to overlap connection portion 108 of cover portion 101, and insert hole 121 and communication hole 122 are inserted. communicate. In this state, the worker inserts the fastener 120 into the insertion hole 121 and the communication hole 122 and fastens. In this manner, the operator can attach the tubular portion 102 to the cover portion 101 . An operator can remove the tubular portion 102 from the cover portion 101 by removing the fastener 120 .

With such a configuration, even if one of the cover portion 101 and the cylindrical portion 102 is damaged, the operator only needs to replace the damaged member, and the entire lubricating oil scattering prevention device 100 can be replaced. No need to replace. As a result, the maintainability of the lubricating oil scattering prevention device 100 can be improved, and the cost of the lubricating oil scattering prevention device 100 can be reduced.

A distal end portion 102 a of the cylindrical portion 102 is arranged adjacent to the shaft sealing device 11 . Various shaft sealing devices having different lengths (more specifically, lengths in the axial direction CL) may be employed as the shaft sealing device 11 . Since the cover portion 101 and the cylindrical portion 102 are configured separately, the lubricating oil scattering prevention device 100 according to the present embodiment has a structure that can be applied to the pump device PA including the shaft seal device having any length. is doing. In other words, by combining the cover portion 101 and the cylindrical portion 102 of any length, or by adjusting the overlapping position of the cover portion 101 and the cylindrical portion 102 at the connection portion 108, the lubricating oil scattering prevention device 100 can be moved in the axial direction. The length in CL can be changed. In this way, the lubricating oil splash prevention device 100 can be used with shaft seal devices 11 having any length.

FIG. 7 is a diagram showing a lubricating oil splash prevention device having a length adjusting mechanism. As shown in FIG. 7 , the lubricating oil splash prevention device 100 has a length adjusting mechanism 130 . In this embodiment, the length adjusting mechanism 130 has an elongated hole 131 extending in the axial direction CL of the rotary shaft 1 and formed in the connecting portion 108 of the cover portion 101 with the cylindrical portion 102 . The cylindrical portion 102 is connected to the cover portion 101 by a fastener 120 inserted into the long hole 131 and is movable in the axial direction CL through the long hole 131 . Note that the length adjusting mechanism 130 only needs to have an elongated hole extending in the direction of the axis CL of the rotating shaft 1 and formed at the connecting portion between the cover portion 101 and the cylindrical portion 102. In one embodiment, the length adjusting mechanism 130 The adjusting mechanism 130 may be an elongated hole extending in the axial direction CL of the rotating shaft 1 and formed in the connecting portion 109 of the cylindrical portion 102 with the cover portion 101 .

According to the present embodiment, the tubular portion 102 can move in the direction of the axis CL relative to the cover portion 101 . Therefore, the operator can adjust the length of the shaft sealing device 11 so that the distance between the cylindrical portion 102 and the shaft sealing device 11 is equal to or less than a predetermined distance. This is because, if the distance between the cylindrical portion 102 and the shaft sealing device 11 becomes long and the tip portion 102a is exposed from the opening 37A, the lubricant leaking from the tip portion 102a will scatter outside. With such a configuration, there is no need to prepare a plurality of lubricating oil anti-scattering devices 100 having cylindrical portions 102 having different lengths according to the length of the shaft sealing device 11, and a single lubricating oil anti-scattering device can be used. Only by preparing 100, it is possible to correspond to a pump device having a shaft sealing device 11 having any length.

FIG. 8 is a diagram showing another embodiment of the tubular portion. FIG. 9 is a cross-sectional view of the lubricating oil scattering prevention device provided with the cylindrical portion according to the embodiment shown in FIG. In the above-described embodiment, the cylindrical portion 102 is composed of divided bodies having a semi-cylindrical shape, but as shown in FIGS. You may The operator forms the plate-like cylindrical portion 102 into a cylindrical shape so as to cover the rotating shaft 1 with the cylindrical portion 102 , and inserts the connecting portion 108 of the cover portion 101 into the cylindrical portion 102 .

A slight gap is formed between the inner surface 102b of the cylindrical portion 102 and the outer surface 108a of the connection portion 108, and the cylindrical portion 102 is connected to the cover portion 101 and is positioned in the axial direction CL of the rotating shaft 1. can be moved to In the embodiment shown in FIGS. 8 and 9, the length adjustment mechanism 130 corresponds to a fitting mechanism composed of the inner surface 102b of the cylindrical portion 102 and the outer surface 108a of the connecting portion 108 that fit together. Therefore, the operator can adjust the overall length of the lubricating oil scattering prevention device 100 by moving the cylindrical portion 102 in the axial direction CL of the rotating shaft 1 while the cylindrical portion 102 is held by the connecting portion 108 . .

FIG. 10 is a diagram showing another embodiment of the pump device. In FIG. 10, illustration of the driving device PA2 is omitted. The pump PA1 shown in FIG. 10 has a different structure from the pump PA1 shown in FIG. 1, but the lubricating oil scattering prevention device 100 is also applicable to the pump device PA including the pump PA1 shown in FIG. .

In the embodiment shown in FIG. 1, the shaft sealing device 11 is composed of a mechanical seal, but in the embodiment shown in FIG. It is composed of a gland packing 214 for sealing. The gland packing 214 is accommodated within a packing housing 222 forming part of the pump casing 5 . This packing housing 222 has a cylindrical shape. The entire gland packing 214 also has a cylindrical shape. The inner peripheral surface of the gland packing 214 is in contact with the outer peripheral surface of the rotating shaft 1 , and the outer peripheral surface of the gland packing 214 is in contact with the inner peripheral surface of the packing housing 222 .

The pump PA1 further includes a packing retainer 225 that presses the outer end surface of the gland packing 214 in the axial direction CL of the rotating shaft 1 and an adjusting bolt 226 that connects the packing retainer 225 to the pump casing 5 . One end of the packing retainer 225 is in contact with the outer end surface of the gland packing 214, and the other end of the packing retainer 225 has a through hole (not shown) into which the adjusting bolt 226 is inserted. The tip of the adjusting bolt 226 is screwed into a female thread 227 formed in the pump casing 5 . Further, in this embodiment, an opening 37A1 is formed at a position where the adjusting bolt 226 is exposed. This allows the operator to easily access the adjustment bolts 226 .

When the adjustment bolt 226 is tightened, the packing retainer 225 pushes the gland packing 214 toward the inside of the pump casing 5 along the rotating shaft 1, and as a result, the gland packing 214 is deformed radially inward. This deformation of the gland packing 214 changes the contact pressure of the gland packing 214 with respect to the rotating shaft 1 . Therefore, by tightening the adjustment bolt 226, the contact pressure of the gland packing 214 with respect to the rotating shaft 1 can be adjusted.

As shown in FIG. 10, the lubricating oil scattering prevention device 100 is fixed to the cover member 37A of the bearing device 9. As shown in FIG. The cylindrical portion 102 of the lubricating oil scattering prevention device 100 is arranged inside the adjusting bolt 226 . Therefore, the operator can easily adjust the adjustment bolt 226 without being obstructed by the cylindrical portion 102 of the lubricating oil splash prevention device 100 .

The above-described embodiments are described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiments can be made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in its broadest scope in accordance with the technical spirit defined by the claims.

REFERENCE SIGNS LIST 1 rotating shaft 2 impeller 3 suction port 4 discharge port 5 casing 5a spiral chamber 9 bearing device 9A, 9B bearing 10 driving machine 10a drive shaft 11 shaft sealing device 30 outer ring 31 inner ring 36 bearing housing 37A, 37B cover member 37A1 opening 38 housing Main body 39 Drain hole 40 Drain pan 50 Seal member 100 Lubricating oil scattering prevention device 100A First split structure 100B Second split structure 100a Upper end 100b Lower end 101 Cover part 101a Opening part 102 Cylindrical part 102a Tip part 102b Inner surface 105 Cover main body 106 Attachment Part 107 Bent part 108 Connection part 108a Outer surface 109 Connection part 110 Fastener 111 Fastening hole 120 Fastener 121 Insertion hole 122 Communication hole 130 Length adjustment mechanism 131 Long hole 214 Gland packing 222 Packing housing 225 Packing retainer 226 Adjustment bolt 227 Female screw

Claims (13)

A lubricating oil scattering prevention device that prevents the lubricating oil of the bearing device from scattering from a rotating shaft extending to the bearing device through a casing in which the impeller is housed,
a cover portion covering one end portion of a seal member that prevents the lubricating oil from leaking from the bearing device to the casing;
A lubricating oil scattering prevention device, comprising: a cylindrical portion that covers the rotating shaft and extends from the cover portion toward the casing. The cover portion has an opening for passing the rotating shaft,
2. The lubricating oil scattering prevention device according to claim 1, wherein said cylindrical portion extends from said opening along said rotating shaft. The lubricating oil scattering prevention device has a gap between the bent portion and the rotating shaft that is larger than the gap between the cylindrical portion and the rotating shaft and is formed at a position adjacent to the bearing device. The lubricating oil scattering prevention device according to claim 1 or 2, wherein the lubricating oil scattering prevention device. The lubricating oil scattering prevention device according to any one of claims 1 to 3, wherein the cover portion can be fixed to the bearing device. The lubricating oil scattering prevention device according to any one of claims 1 to 4, wherein each of the cover portion and the cylindrical portion has a split structure. The lubricating oil scattering prevention device according to any one of claims 1 to 5, wherein each of the cover portion and the cylindrical portion is vertically divided into two parts. The lubricating oil scattering prevention device according to any one of claims 1 to 6, wherein the cylindrical portion is detachably connected to the cover portion. The lubricating oil anti-scattering device according to any one of claims 1 to 7, wherein the lubricating oil anti-scattering device has a length adjusting mechanism. The length adjusting mechanism has an elongated hole extending in the axial direction of the rotating shaft and formed at a connecting portion between the cover portion and the tubular portion,
The lubricating oil scattering prevention device according to claim 8, wherein the cylindrical portion and the cover portion are connected by a fastener inserted into the elongated hole, and are movable in the axial direction through the elongated hole. 9. Lubricating oil scattering prevention according to claim 8, wherein said length adjusting mechanism corresponds to a fitting mechanism composed of said tubular portion that is fitted to each other and a connection portion between said cover portion and said tubular portion. Device. an impeller;
a casing in which the impeller is housed;
a rotating shaft to which the impeller is fixed;
a bearing device that houses a bearing that rotatably supports the rotating shaft and that stores lubricating oil;
A rotary machine comprising: the lubricating oil scattering prevention device according to any one of claims 1 to 10, which prevents the lubricating oil of the bearing device from scattering. The bearing device comprises a cover member arranged adjacent to the bearing,
The bent portion has an upper end and a lower end with openings,
The tubular portion has a distal end portion in which an opening is formed,
12. The rotary machine according to claim 11, wherein an inner wall of the cover member against which the lubricating oil collides is present outside the opening formed by the tip portion, the upper end and the lower end in the axial radial direction of the rotating shaft. . The rotating machine includes a shaft sealing device that seals a gap between the rotating shaft and the casing,
The rotary machine according to claim 11 or 12, wherein the cylindrical portion is arranged inside an adjusting bolt of the shaft sealing device.

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