JP7023742B2 - Pumping equipment and maintenance method of pumping equipment - Google Patents

Description

The present invention relates to a pump device and a maintenance method for the pump device.

In the pump device, the rotating spindle is supported by bearings, and a lubricant is used for the bearings. If the pump device is continued to be used, the lubricant of the bearing may leak to the outside of the pump device due to deterioration over time, which may pollute the surroundings and increase the number of maintenance such as replenishment or replacement of the lubricant.

Special Publication No. 61-46679 Jikkenhei 1-115069 Gazette Japanese Patent Application Laid-Open No. 8-254213 Japanese Patent No. 5980217 Japanese Patent No. 5950997 Jitsukaisho 59-116631 Japanese Patent No. 6073746

The present invention has been made in view of such problems, and the subject of the present invention is a pump maintenance method for suppressing leakage of lubricant to the outside of the pump device, and less leakage of lubricant to the outside of the pump device. It is an object of the present invention to provide a method for manufacturing a lubricant leakage suppressing pump and a pump device capable of suppressing leakage of a lubricant to the outside of the pump device.

According to one aspect of the present invention, the oil seal that is arranged at a position where the lubricant from the bearing that rotatably supports the spindle that rotates in a predetermined direction can scatter and slides on the outer peripheral surface of the spindle is provided on the spindle. When the spindle rotates in the predetermined direction at least on the opposite side of the bearing from the sliding surface with the oil seal on the outer peripheral surface of the spindle and the step of separating from the sliding surface with the oil seal. Provided is a maintenance method for a pump device including a step of forming a groove inclined in a direction in which the lubricant of the sliding surface is pushed back to the bearing side, and a step of attaching an oil seal to the spindle.
By forming such a groove, the lubricant is pushed back to the bearing side by the pumping action, so that leakage of the lubricant can be suppressed. Further, since the lubricant from the bearing is scattered on the oil seal, the sliding between the oil seal and the spindle can be kept good.

In the step of forming the groove, the groove may be formed on at least a part of the sliding surface.
As a result, the effect of pushing back the lubricant is increased, and the pressure of the groove on the sliding surface between the oil seal and the spindle is reduced to generate bubbles in the lubricant, so that the sliding surface between the oil seal and the spindle is separated. It is possible to reduce friction.

In the step of forming the groove, the groove may be formed in at least a part of the bearing side from the sliding surface.
This increases the effect of pushing the lubricant back.

A step of separating the pump device, a step of forming the groove, and a step of attaching the oil seal may be performed on the pump device in which a predetermined amount or more of the lubricant leaks from the sliding surface to the side opposite to the bearing.
Such maintenance prevents the lubricant from leaking to the side opposite to the bearing.

A step of removing the lubricant from the bearing body covering the spindle, and a step of removing the bearing body and the body cover arranged inside the pump body from the pump body containing the impeller attached to the spindle. A step of pulling out the impeller from the spindle, a step of removing the fuselage cover from the bearing fuselage, and a step of removing the shaft sealing device provided on the spindle may be provided, and then the step of releasing the impeller may be performed. ..
In this way, maintenance of the spindle in the pump composed of the impeller, the pump fuselage and the fuselage cover can be performed.

Further, according to another aspect of the present invention, when the spindle rotates in a predetermined direction on at least a part of the outer peripheral surface of the spindle on the opposite side of the bearing from the sliding surface with the oil seal, the sliding surface. Provided is a method for manufacturing a lubricant leakage suppressing pump, comprising a step of forming a groove inclined in a direction in which the lubricant of the above is pushed back to the bearing side, and a step of attaching an oil seal to the spindle.
By forming such a groove on the main shaft, the lubricating oil is pushed back to the bearing side by the pumping action, so that leakage of the lubricating oil can be suppressed.

Further, according to another aspect of the present invention, the pump, the main shaft for rotating the impeller of the pump in a predetermined direction in order to send the conveyed liquid by the operation of the pump, and the main shaft are rotatably supported. In a pump device provided with a bearing and an oil seal that slides on the outer peripheral surface of the spindle and prevents the lubricant from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle. The oil seal is arranged at a position where the lubricant from the bearing is scattered, and the outer peripheral surface of the main shaft on the outer peripheral surface of the main shaft is on the outer peripheral surface of the main shaft on the atmosphere side from the oil seal when the pump is operated. Provided is a pump device comprising a groove inclined in a direction in which the exposed lubricant is pushed back toward the sealed fluid side.
Since such a groove is provided on the spindle, the lubricant is pushed back to the bearing side by the pumping action, so that leakage of the lubricant can be suppressed. Further, since the lubricant from the bearing is scattered on the oil seal, the sliding between the oil seal and the spindle can be kept good.

When the pump operates, the inclined groove forms a first flow in which the lubricant is pushed back to the bearing side, and a second flow in which the lubricant from the bearing reaches the sliding surface. It is desirable that a predetermined amount of the lubricant intervenes in the sliding surface between the oil seal and the outer peripheral surface of the main shaft.
Leakage of the lubricant is suppressed by the first flow, and the sliding between the oil seal and the spindle can be kept good by the second flow.

It is desirable that the inclined groove is provided in at least a part of the outer peripheral surface of the main shaft on the atmospheric side.
With such a groove, the lubricant can be pushed back to the bearing side by the pumping action.

It is desirable that the inclined groove is provided on a sliding surface with the oil seal on the outer peripheral surface of the spindle.
As a result, the effect of pushing back the lubricant is increased, and the pressure of the groove on the sliding surface between the oil seal and the spindle is reduced to generate bubbles in the lubricant, so that the sliding surface between the oil seal and the spindle is separated. It is possible to reduce friction.

It is desirable that the inclined groove is provided in at least a part of the outer peripheral surface of the main shaft on the sealed fluid side.
This increases the effect of pushing the lubricant back.

According to another aspect of the present invention, the spindle for rotating the impeller that pressurizes the transport liquid by driving the drive in a predetermined direction, the bearing that rotatably supports the spindle, and the spindle A bearing cover that penetrates the bearing cover and a sealing member that prevents the lubricant of the bearing from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle, and the bearing cover is scattered from the bearing. The lubricant is configured to flow through the bearing cover to the seal member, and when the spindle rotates, the lubricant on the outer peripheral surface of the spindle is applied to the outer peripheral surface of the spindle from the atmosphere side. A pumping device is provided in which a groove is provided so as to be returned to the sealed fluid side.
As a result, the lubricant scattered from the bearing is supplied to the seal member through the bearing cover, and the fine groove is formed in the main shaft, so that the contact area between the main shaft and the lubricant increases, and the main shaft Since the lubricant exposed from the sealing member on the outer peripheral surface of the main shaft on the atmosphere side is returned to the bearing side by the pumping action, it is possible to suppress the lubricant from leaking from the sealing member to the atmosphere side.

It is desirable that the pump device is a horizontal axis type pump device.
As a result, the pump device can seal the fluid to be sealed by the action of the sealing member while the spindle is stationary. Therefore, in the horizontal axis type pump device, the groove on the outer peripheral surface of the main shaft has a wider allowable range of surface roughness and processing accuracy.

It is desirable that the inclined groove is provided in at least a part of the outer peripheral surface of the main shaft, which is adjacent to the region facing the seal member toward the atmosphere.
As a result, as the spindle rotates, a wind is generated from the atmosphere side of the outer peripheral surface of the spindle toward the bearing on the atmospheric side of the outer peripheral surface of the spindle in which the inclined groove is formed, and this wind lubricates the bearing. The agent is pushed back toward the bearing.

It is desirable that the inclined groove extends from the atmosphere side to the sealed fluid side of the outer peripheral surface of the spindle.
As a result, the lubricant is returned to the bearing side as the spindle rotates.

It is desirable that the oil level of the lubricant is at a liquid level below the spindle when the spindle is stationary.
As a result, when the spindle is stationary, the lubricant does not leak to the atmosphere along the inclined groove of the spindle.

The seal member is an oil seal incorporated in the bearing cover, and the bearing cover is a sliding portion of the oil seal and the outer peripheral surface of the spindle with the lubricant scattered from the bearing on the bearing cover. It is desirable to be configured to be supplied in between.
As a result, the lubricant scattered from the bearing passes through the bearing cover and the lubricant is supplied between the oil seal and the sliding portion on the outer peripheral surface of the spindle, so that the sliding between the oil seal and the spindle can be kept good. can. Further, since the inclined groove is formed, the lubricant exposed from the seal member on the outer peripheral surface of the spindle on the atmospheric side is pushed back to the bearing side by the pumping action, so that the lubricant leaks from the seal member to the atmosphere side. Can be suppressed.

It is desirable that the inclined groove is provided in at least a part on the atmosphere side in contact between the oil seal and the sliding portion on the outer peripheral surface of the main shaft.
As a result, a wind is generated from the atmosphere side of the outer peripheral surface of the spindle toward the bearing, and the wind pushes the lubricant back toward the bearing.

It is desirable that the inclined groove is provided on the sliding portion of the oil seal and the outer peripheral surface of the main shaft.
As a result, the effect of pushing back the lubricant is increased, and the pressure of the groove on the sliding surface between the oil seal and the spindle is reduced to generate bubbles in the lubricant, so that the sliding surface between the oil seal and the spindle is separated. It is possible to reduce friction.

It is desirable that the inclined groove is provided in at least a part of the outer peripheral surface of the main shaft on the sealed fluid side.
This increases the effect of returning the lubricant on the outer peripheral surface of the spindle to the bearing side.

It is desirable that the bearing cover has a structure on the surface on the bearing side to guide the lubricant scattered on the bearing cover to the sealing member.
As a result, the lubricant scattered from the bearing can be guided to the seal member.

As a structure for guiding the lubricant to the seal member, the surface including at least the ceiling surface portion of the inner peripheral surface of the bearing cover becomes the main shaft as it approaches the seal member along the long axis direction of the main shaft. It is desirable to incline to approach.
As a result, the lubricant scattered from the bearing can be guided to the seal member.

It is desirable that the bearing cover has a bearing cover main body and a guide member that guides the lubricant scattered from the bearing to the seal member as a structure for guiding the lubricant to the seal member.
As a result, the lubricant scattered from the bearing can be guided to the seal member.

The guide member is provided on the inner peripheral surface including the uppermost portion of the inner peripheral surface of the bearing cover main body, and has a protrusion shape extending to the seal member along the long axis direction of the main shaft.
It is desirable that the surface of the guide member facing the spindle is inclined so as to approach the spindle as it approaches the seal member along the major axis direction of the spindle.
As a result, the lubricant flows along the inclination of the surface of the guide member facing the main shaft, so that the lubricant can be supplied to the seal member.

The guide member is provided on the inner peripheral surface of the bearing cover main body, has a protrusion shape extending to the seal member along the major axis direction of the spindle, and is parallel to the major axis direction of the spindle and said. It is desirable that the vertical cross section including the guide member is arranged substantially horizontally.
As a result, the lubricant scattered from the bearing adheres to the upper surface of the inner peripheral surface of the bearing cover body, and then falls on the guide member along the inner peripheral surface of the bearing cover body in the circumferential direction. The lubricant that has fallen on the guide member moves along the guide member to the seal member due to inertia. In this way, the lubricant can be supplied to the sealing member.

The guide member is provided on the inner peripheral surface of the bearing cover main body, has a protrusion shape extending to the seal member along the major axis direction of the spindle, and is parallel to the major axis direction of the spindle and said. In the vertical cross section including the guide member, it is desirable that the vertical cross section is inclined downward as it approaches the seal member along the long axis direction of the main shaft.
As a result, the lubricant scattered from the bearing adheres to the upper surface of the inner peripheral surface of the bearing cover body, and then falls on the guide member along the inner peripheral surface of the bearing cover body in the circumferential direction. The lubricant that has fallen on the guide member moves along the guide member to the seal member according to the inclination provided on the guide member. In this way, the lubricant can be supplied to the sealing member.

As a structure for guiding the lubricant to the seal member, it is desirable to further include a deflector member attached to the spindle at a position between the bearing and the seal member.
As a result, the lubricant scattered from the bearing hits the bearing cover and falls on the main shaft, and the lubricating oil that has fallen on the main shaft of the deflector member is again blown to the bearing cover by centrifugal force. The blown lubricant is supplied to the sealing member through the bearing cover. As a result, the lubricant is supplied to the sliding surface of the seal member and the spindle. This lubricant is returned to the bearing side by the pumping action of the groove formed on the surface of the spindle.

It is desirable that the pump device has variable speed means and the drive machine is driven by the variable speed means.

According to another aspect of the present invention, the spindle for rotating the impeller that pressurizes the transport liquid by driving the drive in a predetermined direction, the bearing that rotatably supports the spindle, and the spindle A bearing cover that penetrates the bearing cover and a sealing member that prevents the lubricant of the bearing from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle, and the bearing cover is scattered from the bearing. A maintenance method for a pump device in which the lubricant is configured to flow through the bearing cover to the seal member, wherein the seal member that slides on the outer peripheral surface of the spindle is referred to the seal member on the spindle. In the step of separating from the sliding surface of the main shaft, and when the main shaft rotates, a groove inclined so that the lubricant exposed on the outer peripheral surface of the main shaft on the atmospheric side is pushed back to the sealed fluid side is formed in the main shaft. Provided is a maintenance method of a pump device including a step of forming on an outer peripheral surface and a step of attaching a seal member to the spindle.
Such maintenance prevents the lubricant from leaking to the atmosphere side of the sealing member.

Prevents the lubricant from leaking from the sealed fluid side to the atmosphere side. It suppresses the leakage of the lubricant in the sealing member.

Schematic cross-sectional view of the pump to be maintained in this embodiment. Schematic exploded perspective view of the pump to be maintained in this embodiment. An enlarged cross-sectional view of the vicinity of the spindle 1, the oil seal 11, and the bearing 2 to be maintained according to the present embodiment. FIG. 2A is a further enlarged view of the vicinity of the oil seal 11 in FIG. 2A (broken line portion in FIG. 2A). An enlarged cross-sectional view of the vicinity of the spindle 1, the oil seal 11, and the bearing 2 after maintenance. FIG. 3A is a further enlarged view of the vicinity of the oil seal 11 in FIG. 3A (broken line portion in FIG. 3A). An enlarged view when an oil seal 11'different from FIG. 3B is used. An enlarged view when an oil seal 11 ″ different from that in FIG. 3B is used. The process chart which shows the maintenance procedure of a pump. Schematic cross-sectional view of the pump showing the maintenance process. FIG. 5 is a schematic cross-sectional view of a pump showing a maintenance process following FIG. FIG. 6 is a schematic cross-sectional view of a pump showing a maintenance process following FIG. FIG. 7 is a schematic cross-sectional view of a pump showing a maintenance process following FIG. 7. FIG. 8 is a schematic cross-sectional view of a pump showing a maintenance process following FIG. Schematic cross-sectional view of a pump device with little lubricating oil leakage. FIG. 6 is a schematic cross-sectional view of a pump to be maintained in the second embodiment. Schematic exploded perspective view of the pump to be maintained in the second embodiment. An enlarged cross-sectional view of the vicinity of the spindle 201, the oil seal 211, and the bearing 202 to be maintained according to the second embodiment. FIG. 12A is a further enlarged view of the vicinity of the oil seal 211 (broken line portion in FIG. 2A). An enlarged cross-sectional view of the vicinity of the spindle 201, the oil seal 211 and the bearing 202 after maintenance. FIG. 13A is a further enlarged view of the vicinity of the oil seal 211 (broken line portion in FIG. 3A). An enlarged view when an oil seal 211'different from that of FIG. 13B is used. An enlarged view when an oil seal 211 ″ different from that of FIG. 13B is used. The process chart which shows the maintenance procedure of a pump. Schematic cross-sectional view of the pump showing the maintenance process. FIG. 15 is a schematic cross-sectional view of a pump showing a maintenance process following FIG. FIG. 16 is a schematic cross-sectional view of a pump showing a maintenance process following FIG. FIG. 17 is a schematic cross-sectional view of a pump showing a maintenance process following FIG. FIG. 18 is a schematic cross-sectional view of the pump showing a maintenance process following FIG. Schematic cross-sectional view of a pump device with little lubricating oil leakage. It is a table which shows an example which compared the leakage of the lubricant in the pump device of the prior art and the pump device which concerns on 2nd Embodiment. 6 is a graph showing the results shown in the table of FIG. 21 as changes over elapsed time. It is a vertical sectional view which shows the structure of a part of the pump device which concerns on a comparative example. It is sectional drawing in X of the pump device of FIG. It is a vertical sectional view which shows the structure of a part of the pump device which concerns on the modification of 3rd Embodiment. It is a vertical sectional view which shows the structure of a part of the pump device which concerns on 4th Embodiment. It is a vertical sectional view which shows the structure of a part of the pump device which concerns on 5th Embodiment. It is sectional drawing of the arrow A in the pump device of FIG. 27. FIG. 5 is a cross-sectional view taken along the arrow A of the pump device of FIG. 27 in the pump device according to the first modification of the fifth embodiment. FIG. 29 is a cross-sectional view taken along the line BB'in FIG. FIG. 31 is a cross-sectional view taken along the arrow A of the pump device of FIG. 27 in the pump device according to the second modification of the fifth embodiment. FIG. 31 is a cross-sectional view taken along the line CC ′ of FIG. 31. It is a schematic diagram which shows the schematic structure of the pump device which concerns on 6th Embodiment. FIG. 33 is a sectional view taken along the line DD of FIG. 33. It is sectional drawing which shows the structure of a part of the pump device which concerns on 7th Embodiment.

First, the pump device targeted in the present invention and the cause of the leakage of the lubricant in such a pump device will be described.

1A and 1B are schematic cross-sectional views and exploded perspective views of the target pump device 101, respectively. The pump device 101 includes a pump 100 including an impeller 30, a pump fuselage 32, and a fuselage cover 21, a spindle 1, bearings 2, 3, bearing fuselage 4, bearing covers 5, 6, and an oil seal 11. 12, etc. are provided. Further, the pump body 32 includes a suction port 32-2 and a discharge port 32-1 for the conveyed liquid. The pump device 101 is often installed in a machine room, a pump room, a factory facility, or the like, which is separated from a residential or commercial space.

The spindle 1 is a kind of drive machine to which an impeller 30 is attached to one end side (right side of FIGS. 1A and 1B) and to the spindle end 20 (left side of the same) which is the other end side via a coupling. The rotating shafts of the electric motor (not shown) are configured to be connected. When the pump 100 is operated, the spindle 1 is driven by an electric motor to rotate in a predetermined direction, so that the pump 100 uses the conveyed liquid flowing from the suction port 32-2 as a centrifugal force due to the rotation of the impeller 30. Pressurize and flow out to the discharge port 32-1. The pump device 101 is a horizontal axis pump device in which the spindle 1 is covered with a bearing body 4 and extends in a substantially horizontal direction, and is rotatably supported by two bearings 2 and 3 arranged at a distance from each other. be. Further, a bearing cover 5 through which the spindle 1 penetrates is attached to the bearing body 4 by bolts 10a on the spindle end 20 side of the bearing 2. On the impeller 30 side of the bearing 3, a bearing cover 6 through which the spindle 1 penetrates is attached to the bearing body 4 by bolts 10b.

The spindle 1 is a large-diameter shaft 1a between the bearing 2 on the spindle end 20 side and the bearing 3 on the impeller 30 side. The vertical surface of the bearing 2 on the impeller 30 side is in contact with one end of the large diameter shaft 1a. The vertical surface of the bearing 3 on the motor side is in contact with the other end of the large diameter shaft 1a. The outer surfaces of the bearings 2 and 3 are sandwiched from both sides by the protrusions 7 of the bearing covers 5 and 6 attached to the bearing body 4.

Lubricant is stored between the bearings 2 and 3 in the bearing body 4, and it is necessary that at least a part of the bearings 2 and 3 is immersed in the lubricant when the pump 100 is operated. Since the lubricant in the bearing body 4 evaporates due to the temperature rise during the operation of the pump 100, the bearing body 4 has a cap 14 for the purpose of bleeding air and an oil gauge 15 for checking the degree of decrease of the lubricant. Is provided. Further, by pulling out the plug 16, the lubricant can be discharged to the outside of the bearing body 4. As the lubricant in this embodiment, liquid lubricating oil is used, but semi-solid grease may be used. When the pump 100 is operated, the bearings 2 and 3 become hot and the grease liquefies.

Oil seals 11 and 12, respectively, are incorporated in the bearing covers 5 and 6 in order to prevent the lubricant from leaking to the outside along the outer peripheral surface of the spindle 1. Further, on the outside of the bearing cover 6, the drain ring 13 may be fitted to the spindle 1. Further, it is preferable that a wave washer 9, which is a kind of elastic washer, is interposed between the vertical surface on the outside of the bearing 3 and the bearing cover 6. A compressive stress is applied to the wave washer 9 by the tightening force of the bolt 10b, and a reaction force toward the motor side acts on the spindle 1 via the bearing 3.

A fishing tackle 17 is attached to the upper part of the bearing body 4. Further, the bearing body 4 is supported by the support base 18. The bearing body 4 covers the bearings 2 and 3, but is partially provided with an opening 4a (see FIG. 1B). Further, the impeller 30 side of the bearing body 4 is fixed to the intermediate plate 37 by bolts 36. Further, the intermediate plate 37 is fixed to the pump body 32 in which the impeller 30 is housed by bolts 38. As a result, the bearing body 4 and the pump body 32 are integrated. A gasket is interposed between the bearing body 4 and the intermediate plate 37 and between the intermediate plate 37 and the pump body 32 to seal the bearing body 4.

A fuselage cover 21 through which the spindle 1 penetrates is provided on the spindle 1 side of the pump fuselage 32. A shaft sealing device is provided on the penetrating portion of the fuselage cover 21. Although FIG. 1 shows an example in which the gland packing 23 is used as the shaft sealing device, it may be a mechanical seal. Since the shaft sealing portion causes rotational friction, a shaft sleeve 25 for the gland packing 23 is fitted to the spindle 1, and the gland packing is placed between the shaft sleeve 25 and the tubular portion 21a of the body cover 21. The gland packing 23 is tightened by the bolt 29 via the retainer 28.

An impeller 30 is fitted into a key 19 provided at the tip of the main shaft 1 and fixed by a nut 31. A liner ring 33 is provided between the shroud side I of the impeller 30 and the pump body 32, and a liner ring 34 is provided between the back shroud side B and the body cover 21. A plurality of balance holes 35 are formed near the boss portion of the impeller 30.

FIG. 2A is an enlarged cross-sectional view of the vicinity of the spindle 1, the oil seal 11, and the bearing 2 of the pump device 101 according to the present embodiment. Further, FIG. 2B is a further enlarged view of the vicinity of the oil seal 11 of FIG. 2A (broken line portion of FIG. 2A). As shown in the figure, the spindle 1 rotates the impeller 30 in a predetermined direction (in this example, clockwise when viewed from the motor side (left side of FIG. 2A)), so that the pump 100 can act as a liquid transport machine. You can. Hereinafter, as shown in FIG. 2B, a space S surrounded by a horizontal plane including the radial center of the spindle 1, an oil seal 11, a bearing cover 5, and a bearing 2 is used. Further, the space surrounded by the outer peripheral surface of the spindle 1, the oil seal 11, the bearing cover 5, the bearing 2, and the oil surface OL of the lubricant is filled with the lubricant as oil smoke (mist).

Since the pump device 101 is a horizontal axis type pump device, the axis of the main shaft 1 is substantially horizontal and substantially parallel to the oil level OL of the lubricant. Further, the lubricant is periodically replaced or replenished by maintenance, and the oil level OL of the lubricating oil is near the center of the oil gauge 15, specifically below the lower end of the spindle 1, and the bearings 2 and 3. It is used at the liquid level above the lower end of. That is, in a normal state, the pump 100 is operated with a part of the bearings 2 and 3 located lower than the spindle 1 immersed in the lubricating oil.

In FIG. 2B, as the oil seal 11, a lip seal composed of a reinforcing ring 11a, a seal lip member 11b, a garter spring 11c, and the like is illustrated. The reinforcing ring 11a has a substantially horizontal L-shape in the radial cross-sectional shape, and the seal lip member 11b is annularly adhered to the reinforcing ring 11a. The cross-sectional shape of the seal lip member 11b on the main shaft 1 side is substantially an inverted triangle, and the edge-shaped portion corresponding to the apex of the triangle forms the lip 11d. The lip 11d is deformed when pressed against the outer peripheral surface of the main shaft 1 and slides on the outer peripheral surface of the main shaft 1 with a predetermined axial contact width. A garter spring 11c that presses the lip 11d against the outer peripheral surface of the spindle 1 is mounted on the outer periphery of the lip 11d.

Here, since the lip 11d slides on the outer peripheral surface of the main shaft 1, a lubricant is required between the sliding portion between the lip 11d and the main shaft 1. The lubricant can suppress heat generation due to friction on the sliding surface and prolong the life of the oil seal 11 and the spindle 1. As the lubricant between the sliding portion between the lip 11d and the spindle 1, the lubricant in the bearing body 4 is used. Further, if the heat generated by the bearings 2 and 3 in the continuous operation of the pump 1 is transmitted to the lip 11d via the spindle 1, the lip 11d may be hardened and the life may be shortened. Therefore, the bearings 2 and 3 and the oil seal are used. A predetermined distance is required between the eleven.

After that, the sliding portion between the outer peripheral surface of the spindle 1 and the oil seal 11 (the pressure contact surface between the lip 11d and the outer peripheral surface of the spindle 1) divides the space into two spaces, the spindle end 20 side and the bearing 2 side. As the second space, the space on the bearing 2 side of the oil seal 11 including the space S is referred to as the sealed fluid side, and as the second space, the space outside the pump device 101 and on the spindle end 20 side of the oil seal 11 is the atmosphere. Called the side.

Here, as described above, the pump device 101 may be used in a high temperature installation environment such as a pump room, or may be used in factory equipment or the like that operates for 24 hours. When the pump 100 is continuously operated in such an environment, the lubricant in the sliding portion between the rotating member and the fixing member of the bearing 2 becomes high in temperature and the viscosity of the lubricant becomes low, and the oil seal 11 seals the lubricant. There is a risk that the amount of lubricant leaking from the fluid side to the atmosphere side will increase. Further, due to aged deterioration, a lip groove 1b is formed on the sliding surface on the outer peripheral surface of the main shaft 1, and the pressure of the garter spring 11c is weakened, so that the pressure of the lip 11d on the main shaft 1 is weakened, and the lubricant is released. The amount of leakage increases from the sealed fluid side to the atmosphere side.

As described above, a lubricant is required on the sliding surface between the oil seal 11 and the outer peripheral surface of the spindle 1, and the pump device 101 is often installed in a pump chamber or the like, so that the lubricant is the spindle. It is permissible as long as the spindle 1 is moist along the surface of 1. However, if the amount of the lubricant leaking from the sealed fluid side to the atmosphere side increases, the lubricant may hang down from the spindle 1 or bounce due to the centrifugal force due to the rotation of the spindle 1 to pollute the surroundings. .. Further, the amount of the lubricant stored in the bearing body 4 is reduced, and the frequency of maintenance such as replenishment or replacement of the lubricant is increased. Therefore, in the present embodiment shown in FIG. 10, in order to return the lubricant leaking from the oil seal 11 to the atmosphere side to the sealed fluid side, FIGS. 3A and 3B are formed on the outer peripheral surface of the spindle 1 shown in FIGS. 2A and 2B. A groove 1c as shown in is formed. Further, hereinafter, in FIG. 1 described above and FIG. 10 of the present embodiment, the same reference numerals are given to the same configurations, and the description thereof will be omitted.

FIG. 3A is an enlarged cross-sectional view of the vicinity of the spindle 1, the oil seal 11, and the bearing 2 in the present embodiment shown in FIG. Further, FIG. 3B is a further enlarged view of the vicinity of the oil seal 11 in FIG. 3A (broken line portion in FIG. 3A). As shown in the figure, an inclined groove 1c (unevenness) is formed on the outer peripheral surface of the spindle 1. When the spindle 1 rotates in the clockwise direction when viewed from the motor side (spindle end 20 side), the inclination direction of the groove 1c is inclined from the spindle end 20 side toward the bearing 2 side. It is desirable that the groove 1c is formed over the entire circumference, but there may be a portion where the groove 1c is not provided. Further, it is desirable that the unevenness of the groove 1c is formed at regular intervals, but the unevenness may be formed at irregular intervals.

When the spindle 1 rotates, an air flow is generated by the groove 1c on the atmospheric side and pushed back from the atmospheric side to the sealed fluid side. That is, the direction of inclination of the groove 1c can be said to be the direction of forming the first flow FL1 which is the flow of the lubricant such that the lubricant on the sliding surface is returned to the bearing 2 side when the spindle 1 rotates. ..

Further, in the pump device 101, since the pump 100 is operated in a state where the oil level OL of the lubricant is lower than the lower end of the main shaft 1 as described above, the pump 100 is operated from the bearing 2 in the space S during the operation of the pump 100. It is preferable to dispose the oil seal 11 at a position where the lubricant of the above is scattered on the bearing cover 5 and the lubricant on the sliding surface between the lip 11d and the outer peripheral surface of the spindle 1 is present. As an example of adjusting the arrangement position of the oil seal 11 in the present embodiment, the spindle 1 of the oil seal 11 is adjusted by adjusting the tightening force of the bolt 10a and the thickness of the protrusion portion 7 to adjust the position of the bearing cover 5. It is good to adjust the upper placement position. Further, not only the position of the oil seal 11 in the main shaft 1 direction may be adjusted, but also the position of the bearing 2 in the axial direction may be adjusted. At the time of adjustment, the distance between the bearing 2 and the oil seal 11 is set to be equal to or greater than the above-mentioned predetermined distance. As an example, the distance between the bearing 2 and the oil seal 11 is about 5 to 50 mm. Further, one or a plurality of bolts 10a and a protrusion 7 may be used.

When the oil seal 11 is arranged at a position where the lubricant from the bearing 2 is scattered on the oil seal 11 in the space S, the lip 11d and the outer periphery of the spindle 1 are transmitted along the side surface of the bearing cover 5 on the space S side and the oil seal 11. A second flow FL2, which is a flow of the lubricant flowing on the sliding surface with the surface, is formed. In the present embodiment, the lubricant is replenished to the oil seal 11 by the second flow FL2, and is returned to the bearing body 4 of the lubricant by the first flow FL1 which is the flow of the lubricant by the groove 1c described above. By repeating the flow of the lubricant FL1 and FL2, it is possible to suppress the lubricant from leaking to the atmosphere side while maintaining good sliding between the oil seal 11 and the outer peripheral surface of the spindle 1.

The oil seal 11 is arranged at a position where the lubricant from the bearing 2 is scattered, and on the outer peripheral surface of the spindle 1 from the oil seal 11 to the outer peripheral surface of the spindle 1 on the atmosphere side when the pump 100 is operated. A groove 1c inclined in a direction in which the exposed lubricant is pushed back to the sealed fluid side is provided. Therefore, it is possible to prevent the lubricant from leaking to the atmosphere while maintaining good sliding between the oil seal 11 and the outer peripheral surface of the spindle 1.

Here, the inclined groove 1c is provided in at least a part of the outer peripheral surface of the main shaft 1 that is adjacent to the region facing the oil seal 11 toward the atmosphere. That is, the groove 1c may be formed at least adjacent to the sliding surface with the oil seal 11 on the outer peripheral surface of the main shaft 1 and on the atmospheric side (reference numeral A in FIG. 3B). As a result, when the spindle 1 rotates, an air flow is generated by the groove 1c, and the effect of pushing back the lubricant leaked to the atmosphere side by the lubricant flow FL1 can be obtained.

Further, the inclined groove 1c is provided on the sliding surface of the main shaft 1 with the oil seal 11 on the outer peripheral surface. That is, the groove 1c may be formed or extended to at least a part of the sliding surface (or lip groove 1b) with the lip 11d on the outer peripheral surface of the main shaft 1 (reference numeral B in FIG. 3B). The pressure of the seal portion on the relatively sliding sliding surface decreases, and bubbles are generated in the oil film of the lubricant in the groove 1c on the sliding surface between the lip 11d and the spindle 1. With this bubble, the friction between the lip 11d, the spindle 1 and the sliding surface can be reduced (also referred to as "lower friction"). As a result, friction and wear on the outer peripheral surfaces of the lip 11d and the spindle 1 can be reduced.

Further, the inclined groove 1c is provided in at least a part of the outer peripheral surface of the main shaft 1 on the sealed fluid side. That is, the groove 1c may be adjacent to the sliding surface of the outer peripheral surface of the spindle 1 with the oil seal 11, and may be formed or further extended to at least a part of the sealed fluid side (reference numeral 3B). C). By doing so, the lubricant can be returned more toward the bearing 2. In particular, when the groove 1c is stretched until it comes into contact with the bearing 2 and the lubricant pushed back from the atmosphere side reaches the side surface 2-1 of the bearing 2, the oil level OL of the lubricant is lower than that of the spindle 1, so that the atmosphere The lubricant pushed back from the side can be quickly returned to the inside of the bearing 2 through the groove 1c and the side surface 2-1 of the bearing 2 located below the spindle 1.

Therefore, by forming the groove 1c and arranging the oil seal 11 at a position where the lubricant from the bearing 2 scatters on the oil seal 11, it is possible to prevent the lubricant from scattering to the outside and pollute the surroundings, or to use a pump device. It is possible to reduce the maintenance work of replenishing or replacing the lubricant in the bearing body 4 due to the leakage of the lubricant in 101. Further, even if the pressing of the lip 11d is weakened due to aged deterioration, the sealing property can be ensured by returning the lubricant to the sealed fluid side by the first flow FL1, and as a result, the replacement life of the oil seal 11 is extended. Can be lengthened. Further, while the pump 100 is in operation, the lubricant is supplied to the sliding portion of the lip 11d and the spindle 1 by the second flow FL2 of the lubricant, so that heat generation and wear due to friction of the sliding surface are generated. It is also possible to suppress and extend the life of the oil seal 11 and the spindle 1.

Further, as shown in FIG. 10, a groove 1c is formed on the outer peripheral surface of the bearing 3 and the oil seal 12 arranged on the impeller 30 side, and the main shaft 1 facing the bearing 3 and the oil seal 12, and the lubricant from the bearing 3 is formed. By arranging the oil seal 12 at a position where the bearings scatter on the oil seal 12, it is possible to suppress leakage of the lubricant from the oil seal 12 while maintaining good sliding between the oil seal 12 and the spindle 1.

A shaft sleeve (not shown) may be used to protect the sliding surface of the spindle 1 at least at a position on the spindle 1 including the sliding surfaces of the oil seals 11 and 12. In that case, the spindle 1 is fitted in the shaft sleeve, and the spindle 1 and the shaft sleeve rotate concentrically in the radial direction. Therefore, the shaft sleeve is a part of the spindle. Further, also in the pump device 101 using the oil seal 11'or 11'' described later in FIG. 3C or FIG. 3D, the formation of the groove 1c and the lubricant from the bearing 2 or 3 are applied to the oil seal 11'or 11''. By arranging the oil seal 11'or 11'' at a position where it can scatter, the oil seal 11'or 11'' and the spindle 1 can be slid well, and the leakage of the lubricant to the atmosphere side is suppressed. be able to.

Further, in FIG. 1A, a pump device 101 using a single-stage single-suction centrifugal pump has been described as an example, but any pump device, particularly an oil bath type bearing using a lubricant, and a bearing lubricant are sealed. The arrangement of the groove 1c and the bearing and the oil seal on the outer peripheral surface of the spindle 1 according to the present embodiment can be applied to the oil seal and the horizontal axis pump device provided with the horizontal axis pump.

In the pump device 101, which is an example of the embodiment, the following maintenance can be performed on the pump device 101 of FIG. 1 in which a predetermined amount or more of the lubricant leaks to the atmosphere side due to aged deterioration. That is, the oil seal 11 and the spindle 1 in FIGS. 2A and 2B are separated from each other, a groove 1c as shown in FIGS. 3A and 3B is formed on the outer peripheral surface of the spindle 1, and then the original oil seal 11 or a new one is used. By attaching the oil seal 11 and the spindle 1, the pump device 101 shown in FIG. 10 is obtained.

At this time, the oil seal 11 does not need to be completely separated from the spindle 1. The step may be a step of sliding the oil seal 11 on the spindle 1 to separate it from the sliding surface with the oil seal on the outer peripheral surface of the spindle 1.

FIG. 3A is an enlarged cross-sectional view of the vicinity of the spindle 1, the oil seal 11, and the bearing 2 after maintenance. Further, FIG. 3B is a further enlarged view of the vicinity of the oil seal 11 in FIG. 3A (broken line portion in FIG. 3A). As shown in the figure, an inclined groove 1c (unevenness) is formed on the outer peripheral surface of the main shaft 1. When the spindle 1 rotates in the clockwise direction when viewed from the motor side, the inclination direction of the groove 1c is inclined in a direction higher from the motor side toward the bearing 2 side.

By forming such a groove 1c, when the spindle 1 rotates, an air flow is generated by the groove 1c in the atmosphere, and the lubricant is pushed back from the atmosphere side to the sealed fluid side. That is, it can be said that the inclination direction of the groove 1c is a direction in which the lubricant on the atmospheric side is returned to the bearing 2 side when the spindle 1 rotates. This can prevent the lubricant from leaking.

If the groove 1c is formed at least on the atmospheric side of the main shaft 1, when the main shaft 1 rotates, an air flow is generated by the groove 1c, so that the effect of pushing back the lubricant can be obtained. Further, the groove 1c may be formed or extended to at least a part of the sliding surface (or the lip groove 1b) on the main shaft 1 (reference numeral B in FIG. 3B). As a result, the friction between the oil seal 11 and the spindle 1 can be reduced. Further, the groove 1c may be formed or extended from the sliding surface (or lip groove 1b) on the spindle 1 to at least a part of the bearing 2 side (reference numeral C in FIG. 3B). This further enhances the effect of pushing the lubricant back.

As described above, in the present embodiment, the oil seal 11 and the bearing 2 are arranged at positions where the lubricant scattered from the bearing 2 reaches the sliding surface between the oil seal 11 and the outer peripheral surface of the spindle 1. Then, as the spindle 1 rotates, a part of such a lubricant is pushed back to the bearing 2 side. As a result, the leakage of the lubricant is suppressed, and an appropriate amount of the lubricant is interposed on the sliding surface between the oil seal 11 and the spindle 1.

It should be noted that such maintenance can also be applied to the outer peripheral surface of the bearing 3 and the oil seal 12 arranged on the impeller 30 side in FIG. 1 and the spindle 1 facing the bearing 3 and the oil seal 12. That is, the sliding surfaces of the oil seal 12 and the outer peripheral surface of the spindle 1 are separated from each other to form a groove 1c inclined on the impeller 30 side (opposite side of the bearing 3) from the sliding surface of the oil seal 12 and the spindle 1. You may. The inclination direction of the groove 1c is a direction in which the lubricant on the sliding surface is returned to the bearing 3 side when the spindle 1 rotates, which is opposite to the groove 1c formed on the bearing 2 side.

Further, various oil seals can be applied.
FIG. 3C is an enlarged view when an oil seal 11'different from that of FIG. 3B is applied. A sealing sleeve 80 is provided as part of the spindle 1. The oil seal 11'includes a resin seal lip member 81 having an L-shaped cross section, and the seal lip member 81 has an outer bonded metal ring 82 having a substantially L-shaped cross section and an inner bonding metal ring 82 having a substantially L-shaped cross section. It is sandwiched by the presser metal ring 83 of. A tubular lip 84 is formed on the inner peripheral side of the seal lip member 81, and the tubular lip 84 corresponds to the lip 11d in FIG. 3B and tightly adheres to the outer peripheral surface of the sealing sleeve 80 to seal the sealed fluid. .. When the oil seal 11'shown in FIG. 3C is used, the groove 1c may be formed in the seal sleeve 80 which is a part of the spindle 1.

FIG. 3D is an enlarged view when an oil seal 11 ″, which is different from that of FIG. 3B, is applied. The oil seal 11 ″ has a tubular portion 92. Depending on the installation environment, foreign matter such as dust may be mixed in from the atmosphere side. Therefore, the tubular portion 92 prevents foreign matter from entering the oil seal 11 ″. Therefore, it is possible to reduce the wear of the sliding surface on the lip portion of the oil seal 11 ″ and the outer peripheral surface of the spindle 1 due to the mixing of foreign matter from the atmosphere side.

The maintenance procedure will be described in detail below.
FIG. 4 is a process diagram showing a maintenance procedure of the pump device 101. Note that FIG. 4 is merely an example of the procedure, and each step may be replaced or omitted as appropriate.

First, the connection with the motor (not shown) is disconnected. (Step S1). Further, the plug 16 is removed and the lubricant is removed from the bearing body 4 (step S2). Subsequently, the bolt 38 for the pump body 32 is removed, and the intermediate plate 37, the body cover 21 and the bearing body 4 are removed from the pump body 32 (step S3). As a result, the state shown in FIG. 5 is obtained.

After that, the nut 31 for the impeller 30 is removed, and the impeller 30 is pulled out from the spindle 1 (step S4). Then, the key 19 on the impeller 30 side is removed from the spindle 1. As a result, the state shown in FIG. 6 is obtained. Further, the bolt 36 is removed, and the intermediate plate 37 and the body cover 21 are removed from the bearing body 4 (step S5). Next, the bolt 29 for the gland packing 23 is removed, and the gland packing 23 is removed (step S6). As a result, the state shown in FIG. 7 is obtained.

Then, if the draining ring 13 is present, the draining ring 13 is removed from the spindle 1 (step S7). Next, the bolts 10a and 10b for the bearing covers 5 and 6 are removed, the bearing covers 5 and 6 and the oil seals 11 and 12 are removed from the bearing body 4, and the spindle 1 is pulled out (step S8). As a result, the state shown in FIG. 8 is obtained. In this way, the spindle 1 and the oil seals 11 and 12 are separated. When pulling out the spindle 1, check the rotational state of the bearings 2 and 3, and if smooth rotation is not possible, replace the bearings 2 and 3.

Then, the groove 1c described with reference to FIGS. 3A and 3B is formed in the vicinity of the bearings 2 and 3 on the spindle 1 (step S9). As a result, the state shown in FIG. 9 is obtained. Specifically, the groove 1c is formed by scratching the outer peripheral surface of the spindle 1. It is desirable that the groove 1c is formed over the entire circumference, but there may be a portion where the groove 1c is not provided.

After that, if necessary, the oil seals 11 and 12 may be replaced with new ones, and the pump may be assembled in the reverse procedure. As a result, it can be said that a new pump device (lubricant leak suppression pump device) with less lubricant leakage shown in FIG. 10 is manufactured.

As described above, in the present embodiment, it is possible to prevent the lubricant from leaking along the spindle 1 by a simple method of forming a groove 1c by scratching the outer peripheral surface of the spindle 1 so as to be inclined in a predetermined direction.

In addition, instead of forming the groove 1c in the spindle 1 for maintenance, the groove 1c may be provided in advance on the outer peripheral surface of the spindle 1 of a new pump. Further, in FIG. 1A, a pump device 101 using a single-stage single-suction centrifugal pump has been illustrated as an example, but any pump device, particularly an oil bath type bearing using a lubricant, an oil seal, and a horizontal axis pump, has been described. This embodiment can be applied to a horizontal axis pump device provided with the above.

The pump device 101 maintained by the above procedure can reduce the maintenance work of replenishing or replacing the lubricant due to the leakage of the lubricant. Further, even if the pressing of the lip 11d is weakened due to aged deterioration, the sealing property can be ensured by returning the lubricant to the bearing body 4 by the first flow FL1, and as a result, the replacement life of the oil seal 11 is extended. can do. Further, during the pump operation, the lubricant is supplied between the sliding portion of the outer peripheral surface of the lip 11d and the spindle 1 by the second flow FL2 of the lubricant, so that heat is generated due to friction of the sliding surface. It is also possible to suppress wear and extend the life of the oil seal 11 and the spindle 1. It is also applicable to the outer peripheral surface of the bearing 3 and the oil seal 12 arranged on the impeller 30 side in FIG. 1 and the spindle 1 facing the bearing 3 and the oil seal 12.

The above-described embodiments have been described for the purpose of allowing a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the invention is not limited to the described embodiments and should be the broadest scope according to the technical ideas defined by the claims.

<Second embodiment>
Subsequently, the second embodiment will be described. First, the problems of the prior art will be described.

In Patent Document 6, at least the upper half of the inner surface of the end wall of the outer box (bearing cover) is provided with an oil flow lower portion surrounding the axis of rotation. Oil droplets flowing down from above the rotation axis along the inner surface of the end wall of the outer box flow down to the lower part of the outer box so as to avoid the rotation axis by the lower part of the oil flow, and oil leaks from between the penetrating part and the rotation axis. Prevent it from happening. Specifically, since a groove surrounding the rotation axis is formed on the inner surface of the end wall, oil droplets flow into the groove and are guided to avoid the rotation axis and flow down. Then, it flows out from the bottom of the groove and is stored in the bottom of the outer box. Since the oil droplets are guided by the groove and flow down so as to avoid the rotation shaft, oil is prevented from leaking from between the rotation shaft and the sealing member.

However, the scattering of oil droplets from the bearing differs depending on the rotation speed of the rotating shaft. Due to the recent demand for energy saving, the rotation speed of the pump may be controlled by using a variable speed means such as an inverter (for example, constant pressure control, estimated end pressure control, etc.). When the rotation speed of the rotating shaft is low, the scattering distance of the oil droplets scattered from the bearing becomes short, and the oil droplets do not reach the outer box (bearing cover) and travel along the rotating shaft in the circumferential direction to the penetration part. There is a problem that oil may leak from between the rotating shaft. Further, as the lubricant for the bearing of the rotary machine, not only liquid lubricating oil but also semi-solid grease or the like may be used, but in Patent Document 6, the semi-solid lubricant or deteriorated and highly viscous. If lubricating oil is used, it will harden in the groove surrounding the rotating shaft and will not flow down the oil droplets.

In Patent Document 7, an oil cover and an oil drain ring are arranged between the bearing and the bearing cover, and an oil escape groove is formed at a portion of the inner surface of the bearing cover facing the bearing. Further, in Patent Document 7, the bearing cover, the oil cover, and the oil drain ring suppress the lubricating oil scattered from the bearing from flowing out from the oil escape groove (to the side of the electric motor) when the spindle rotates. It is disclosed that it functions as a lubricating oil outflow control device.

However, this lubricating oil outflow suppressing device has a problem that the number of parts increases because the oil cover is attached to the bearing cover. It is also used as a mechanism to seal the lubricating oil in the oil relief groove. As the lubricant for the bearing of the rotary machine, not only liquid lubricating oil but also semi-solid grease or the like may be used, but the lubricating oil outflow suppressing device of Patent Document 7 is a semi-solid lubricant and lubricating oil. The oil seal as a mechanism for sealing is not considered.

Patent Document 4 has three functions of preventing leakage at rest, sucking in a sealed fluid, and discharging a sealed fluid in a pumping portion processed into a rotating shaft. Further, since the sliding surface can rotate in both directions, the shape of the pumping portion is complicated and processing accuracy is required. For this reason, when taking measures against lubricant leakage during maintenance, it is difficult to perform such processing at the place where the pump where the lubricant leaked is installed, and once there is a dedicated processing machine, etc. There was a problem that it was necessary to take it back to the factory and process it, which took time and labor.

Further, the leakage of the lubricant of the bearing in the pump device that pressurizes and pumps the conveyed liquid varies depending on the place where it is installed, the environment in which it is used, and the situation in which it is used. Also, the permissible range of lubricant leakage will vary from pump operator to pump operator. Therefore, it is desired that the preventive measure against leakage of the lubricant is a means that facilitates additional processing at the time of shipment or maintenance. In particular, when taking measures against lubricant leakage during maintenance, it is desired that the measures can be performed regardless of the ambient temperature, the rotation speed of the pump, the type of lubricant for the bearing, the lubricant sealing device, and the like.

First, the pump device targeted in the present invention and the cause of the leakage of the lubricant in such a pump device will be described.

11A and 11B are schematic cross-sectional views and exploded perspective views of the target pump device 301, respectively. The pump device 301 includes an impeller 230, a pump 300 including a pump body (pump casing) 232, and a body cover 221, and a spindle (shaft) 201, bearings 202, 203, bearing body 204, and bearing covers 205, 206. , And oil seals 211,212, and the like. Further, the pump body 232 includes a suction port 232-2 and a discharge port 232-1 for the conveyed liquid. Here, the oil seals 211 and 212 are examples of seal members that seal between the spindle 201 and the bearing cover 205 that are concentrically arranged inside and outside the radial direction. As an example, the pump device 301 is often installed in a machine room or a pump room separated from a residential or commercial space, or in a factory facility or the like.

An impeller 230 is attached to one end side (right side of FIGS. 11A and 11B) of the spindle 201, and an electric motor which is a kind of a drive machine is attached to the spindle end 220 (the left side of the same) which is the other end side via a coupling. The rotating shafts (not shown) are connected. During the operation of the pump 300, the spindle 201 driven by the electric motor rotates in a predetermined direction. The pump 300 pressurizes the conveyed liquid that has flowed in from the suction port 232-2 by the centrifugal force generated by the rotation of the impeller 230, and flows out to the discharge port 232-1. The pump device 301 is a horizontal axis type pump device. Specifically, the spindle 201 is covered with a bearing body 204 and extends in a substantially horizontal direction, and is rotatably supported by two bearings 202 and 203 arranged at a distance from each other. Further, a bearing cover 205 through which the spindle 201 penetrates is attached to the bearing body (bearing housing) 204 by bolts 210a on the side of the spindle end 220 of the bearing 202. On the impeller 230 side of the bearing 203, the bearing cover 206 through which the spindle 201 penetrates is attached to the bearing body 204 by bolts 210b. As a result, the bearing cover 205 covers at least a part of the outer ring of the bearing 203. Further, the bearing cover 205 through which the spindle 201 penetrates and the bearing body 204 may be integrally configured.

The spindle 201 is a large-diameter shaft 201a between the bearing 202 on the spindle end 220 side and the bearing 203 on the impeller 230 side. The vertical surface of the bearing 202 on the impeller 230 side is in contact with one end of the large diameter shaft 201a. The vertical surface of the bearing 203 on the motor side is in contact with the other end of the large diameter shaft 201a. The outer surfaces of the outer rings of the bearings 202 and 203 are sandwiched from both sides by the protrusions 207 of the bearing covers 205 and 206 attached to the bearing body 204, respectively. Thereby, the bearing cover 205 supports the bearing 202 as an example, and the bearing cover 206 supports the bearing 203.

Lubricant is stored between the bearings 202 and 203 in the bearing body 204, and at least a part of the bearings 202 and 203 is immersed in the lubricant when the pump 300 is operated. During the operation of the pump 300, the lubricant in the bearing body 204 evaporates due to the temperature rise, so the bearing body 204 has a cap 214 for the purpose of bleeding air and an oil gauge 215 for checking the decrease of the lubricant. Is provided. Further, when the plug 216 is pulled out, the lubricant can be discharged to the outside of the bearing body 204. As the lubricant in this embodiment, liquid lubricating oil is used, but semi-solid grease may be used. When the pump 300 is operated, the bearings 202 and 203 become hot and the grease liquefies.

Oil seals 211 and 212 are incorporated in the bearing covers 205 and 206 in order to prevent the lubricant from leaking to the outside along the outer peripheral surface of the spindle 201. Further, the drain ring 213 may be fitted to the main shaft 201 on the outer side of the bearing cover 206. Further, it is preferable that the wave washer 209, which is a kind of elastic washer, is interposed between the vertical surface on the outside of the bearing 203 and the bearing cover 206. A compressive stress is applied to the wave washer 209 by the tightening force of the bolt 210b, and a reaction force acts on the spindle 201 toward the motor side via the bearing 203.

The fishing tackle 217 is attached to the upper part of the bearing body 204. Further, the bearing body 204 is supported by the support base 218. The opening 204a is provided in the bearing body 204 (see FIG. 11B). Further, the impeller 230 side of the bearing body 204 is fixed to the intermediate plate 237 by bolts 236, and the intermediate plate 237 is fixed to the pump body 232 containing the impeller 230 by bolts 238. As a result, the bearing body 204 and the pump body 232 are integrated. A gasket is interposed and sealed between the bearing body 24 and the intermediate plate 237 and between the intermediate plate 237 and the pump body 232.

On the spindle 201 side of the pump fuselage 232, a fuselage cover 221 through which the spindle 201 penetrates is provided. The penetrating portion of the spindle 201 of the fuselage cover 221 includes a shaft sealing device. Although FIG. 11 shows an example in which the gland packing 223 is used as the shaft sealing device, the shaft sealing device may be a mechanical seal. Since the shaft sealing portion causes rotational friction, a shaft sleeve 225 for the gland packing 223 is fitted to the spindle 201, and a gland packing is provided between the shaft sleeve 225 and the tubular portion 221a of the body cover 221. The gland packing 223 is tightened by the bolt 229 via the retainer 228.

The impeller 230 is fitted into a key 219 provided at the tip of the spindle 201 and fixed to the spindle 201 by a nut 231. The liner ring 233 is provided between the shroud side I of the impeller 230 and the pump body 232. Further, the liner ring 234 is provided between the back shroud side B and the fuselage cover 221. The plurality of balance holes 235 are formed in the vicinity of the boss portion of the impeller 230.

FIG. 12A is an enlarged cross-sectional view of the vicinity of the spindle 201, the oil seal 211, and the bearing 202 of the pump device 301 according to the second embodiment. Further, FIG. 12B is a further enlarged view of the vicinity of the oil seal 211 (broken line portion in FIG. 12A) of FIG. 12A. As shown in the figure, when the impeller 230 is rotated in a predetermined direction (in this example, clockwise when viewed from the motor side (left side of FIG. 12A)), the pump 300 acts as a liquid transport machine. Hereinafter, as shown in FIG. 12B, a space S surrounded by a horizontal plane including the radial center of the spindle 201, an oil seal 211, a bearing cover 205, and a bearing 202 is used. Further, the space surrounded by the outer peripheral surface of the spindle 201, the oil seal 211, the bearing cover 205, the bearing 202, and the oil surface OL of the lubricant is filled with the lubricant as oil smoke (mist).

Since the pump device 301 is a horizontal axis type pump device, the main shaft 201 is substantially horizontal and substantially parallel to the oil level OL of the lubricant. Further, the lubricant is periodically replaced or replenished by maintenance, and the oil level OL of the lubricating oil is near the center of the oil gauge 215, specifically, below the lower end of the spindle 201 and the bearings 202 and 203. It is used at the liquid level above the lower end of. That is, the pump 300 is operated with a part of the bearings 202 and 203 located lower than the spindle 201 immersed in the lubricating oil.

The oil seal 211 uses a deformable material such as felt, synthetic rubber, or synthetic resin, and the tip thereof is brought into frictional contact with the spindle 201 to perform a sealing action. As an example, the oil seal 211 of FIG. 12B exemplifies a lip seal composed of a reinforcing ring 211a, a seal lip member 211b, a garter spring 211c, and the like. The reinforcing ring 211a has a substantially horizontal L-shape in the radial cross-sectional shape, and the seal lip member 211b is annularly adhered to the reinforcing ring 211a. The cross-sectional shape of the seal lip member 211b on the main shaft 201 side is substantially an inverted triangle, and the edge-shaped portion corresponding to the apex of the triangle forms the lip 211d. The lip 211d is deformed when pressed against the outer peripheral surface of the main shaft 201 and slides on the outer peripheral surface of the main shaft 201 with a predetermined axial contact width. A garter spring 211c that presses the lip 211d against the outer peripheral surface of the spindle 201 is mounted on the outer periphery of the lip 211d.

Here, since the lip 211d slides on the outer peripheral surface of the main shaft 201, a lubricant is required between the sliding portion between the lip 211d and the main shaft 201. By suppressing heat generation due to friction on the sliding surface with the lubricant, the life of the oil seal 211 and the spindle 201 can be extended. As the lubricant between the sliding portion between the lip 211d and the spindle 201, the lubricant in the bearing body 204 is used. Further, when the heat of the bearings 202 and 203 is transferred to the lip 211d via the spindle 201, the lip 211d is hardened and the life is shortened. Therefore, a predetermined distance is required between the bearings 202 and 203 and the oil seal 211. ..

After that, in the sliding portion between the outer peripheral surface of the spindle 201 and the oil seal 211 (the pressure contact surface between the lip 211d and the outer peripheral surface of the spindle 201), the first space on the spindle end 220 side and the second space on the bearing 202 side. Divide into two spaces. The first space is a space on the bearing 202 side of the oil seal 211 including the space S, and is referred to as a sealed fluid side. The second space is a space on the outside of the pump device 301 and on the main shaft end 220 side of the oil seal 211, and is referred to as the atmosphere side.

Here, as described above, the pump device 301 is used, for example, in an installation environment where the temperature is high, such as in a pump room. In another example, the pump device 301 is used in factory equipment or the like that operates 24 hours a day. When the pump 300 is continuously operated in such an environment where the outside air temperature is high, the lubricant of the sliding portion between the rotating member and the fixing member of the bearing 202 becomes high temperature and the viscosity becomes low. Then, the amount of the lubricant leaking from the sealed fluid side to the atmosphere side of the oil seal 211 increases. Further, when the lip groove 201b is formed on the sliding surface of the spindle 201 due to aged deterioration, the amount of the lubricant leaking from the sealed fluid side to the atmosphere side due to insufficient pressing of the lip 211d on the spindle 201. Will increase. Further, when the pressing of the garter spring 211c becomes weak due to aged deterioration, the pressing of the lip 211d on the spindle 201 becomes insufficient, and the amount of the lubricant leaking from the sealed fluid side to the atmosphere side increases.

As described above, the sliding surface between the oil seal 211 and the outer peripheral surface of the spindle 201 requires a lubricant. Moreover, the pump device 301 is often installed in a pump room or the like. Therefore, the operator of the pump device 301 allows as long as the lubricant leaking from the sealed fluid side to the atmosphere side travels along the surface of the spindle 201 and the spindle 201 is moist. However, when the amount of the lubricant leaking from the sealed fluid side to the atmosphere side increases, the lubricant drips from the main shaft 201 or bounces due to the centrifugal force due to the rotation of the main shaft 201, and pollutes the surroundings. Further, the amount of the lubricant stored in the bearing body 204 is reduced, and the frequency of maintenance such as replenishment or replacement of the lubricant is increased in the pump device 301. Therefore, in the present embodiment shown in FIG. 20, in order to return the lubricant leaking from the oil seal 211 to the atmosphere side to the sealed fluid side, FIGS. 13A and 13B are shown on the outer peripheral surface of the spindle 201 shown in FIGS. 12A and 12B. A groove 201c as shown is formed. Further, hereinafter, in FIG. 11 described above and FIG. 20 of the present embodiment, the same reference numerals are given to the same configurations, and the description thereof will be omitted.

FIG. 13A is an enlarged cross-sectional view of the vicinity of the spindle 201, the oil seal 211, and the bearing 202 in the present embodiment shown in FIG. 20. Further, FIG. 13B is a further enlarged view of the vicinity of the oil seal 211 (broken line portion in FIG. 13A) of FIG. 13A. As shown in the figure, the spindle 201 forms a groove 201c (unevenness) inclined on the outer peripheral surface. When the spindle 201 rotates in the clockwise direction when viewed from the motor side (spindle end 220 side), the inclination direction of the groove 201c is the spindle end 220 side on the right side surface when viewed from the motor side (spindle end 220 side). Inclines in the direction of increasing toward the bearing 202 side. It is desirable that the groove 201c is formed over the entire circumference of the spindle 201, but there may be a portion of the spindle 201 that does not have the groove 201c. Further, it is desirable that the unevenness of the groove 201c is formed at regular intervals, but unevenness may be formed at irregular intervals.

When the spindle 201 is rotated by the operation of the pump 300, an air flow is generated by the groove 201c on the atmospheric side, and the lubricant is pushed back from the atmospheric side to the sealed fluid side. That is, the direction of inclination of the groove 201c forms a first flow FL1 in which the lubricant on the outer peripheral surface of the spindle 201 returns from the spindle end 220 side to the bearing 202 side when the spindle 201 is rotated by the operation of the pump 300. The direction.

Further, in the pump device 301, when the main shaft is stationary, the oil level OL of the lubricant is the liquid level below the main shaft 201 as described above. The oil seal 211 is a position where the lubricant from the bearing 202 is scattered on the bearing cover 205 in the space S during the operation of the pump 300, and the lubricant on the sliding surface between the lip 211d and the outer peripheral surface of the spindle 201 is present. It is good to place it in. As an example of the method of adjusting the arrangement position of the oil seal 211 in the present embodiment, the arrangement position of the oil seal 211 adjusts the position of the bearing cover 205 by adjusting the tightening force of the bolt 210a and the thickness of the protrusion portion 207. Further, the arrangement position of the oil seal 211 may not only adjust the position of the oil seal 211 in the spindle 201 direction but also adjust the position of the bearing 202 in the axial direction. At the time of adjustment, the distance between the bearing 202 and the oil seal 211 is set to be equal to or greater than the above-mentioned predetermined distance. As an example, the distance between the bearing 202 and the oil seal 211 is about 5 to 50 mm. Further, one or more bolts 210a and the protrusion 207 may be used.

When the oil seal 211 is arranged at a position where the lubricant from the bearing 202 is scattered on the oil seal 211 in the space S, the lip 211d and the outer periphery of the spindle 201 are transmitted along the side surface of the bearing cover 205 on the space S side and the oil seal 211. A second flow FL2, which is a flow of the lubricant flowing on the sliding surface with the surface, is formed. In the present embodiment, the lubricant is replenished to the oil seal 211 by the second flow FL2, and is returned to the bearing body 204 of the lubricant by the first flow FL1 which is the flow of the lubricant by the groove 201c described above. By repeating the first flow FL1 and the second flow FL2 of the lubricant, the lubrication is suppressed from leaking to the atmosphere side while maintaining good sliding between the oil seal 211 and the outer peripheral surface of the spindle 201. can.

The oil seal 211 in the pump device 301 is arranged at a position where the lubricant from the bearing 202 is scattered, and the outer peripheral surface of the spindle 201 is provided with a groove 201c. Then, when the pump 300 is operated, the groove 201c is inclined in a direction in which the lubricant exposed on the outer peripheral surface of the main shaft 201 on the atmospheric side is pushed back to the sealed fluid side from the oil seal 211. As a result, the pump device 301 can prevent the lubricant of the bearing 202 from leaking to the atmosphere side while maintaining good sliding between the oil seal 211 and the outer peripheral surface of the spindle 201.

Here, the inclined groove 201c is provided in at least a part of the outer peripheral surface of the main shaft 201 on the atmospheric side. That is, the groove 201c may be formed at least adjacent to the sliding surface with the oil seal 211 on the outer peripheral surface of the main shaft 201 and on the atmospheric side (reference numeral A in FIG. 13B). As a result, when the spindle 201 rotates, an air flow is generated in the outer peripheral surface of the spindle 201 by the groove 201c, and the effect of pushing back the lubricant leaked to the atmosphere side by the lubricant flow FL1 can be obtained.

Further, the inclined groove 201c is provided on the sliding surface of the main shaft 201 with the oil seal 211 on the outer peripheral surface. That is, the groove 201c may be formed or extended on at least a part of the sliding surface (or lip groove 201b) with the lip 211d on the outer peripheral surface of the main shaft 201 (reference numeral B in FIG. 13B). On the sliding surface between the lip 211d and the spindle 201, the pressure of the seal portion on the sliding surface that slides relatively decreases, and the oil film of the lubricant in the groove 201c on the sliding surface between the lip 211d and the spindle 201 Bubbles form inside. With this bubble, the friction between the lip 211d, the spindle 201, and the sliding surface can be reduced (also referred to as "lower friction"). As a result, friction and wear on the outer peripheral surfaces of the lip 211d and the spindle 201 can be reduced.

Further, the inclined groove 201c is provided in at least a part of the outer peripheral surface of the main shaft 201 on the sealed fluid side. That is, the groove 201c may be adjacent to the sliding surface of the outer peripheral surface of the main shaft 201 with the oil seal 211, and may be formed or further extended to at least a part of the sealed fluid side (reference numeral 13B). C). By doing so, the pump device 301 can return the lubricant more toward the bearing 202. In particular, when the groove 201c is stretched until it comes into contact with the bearing 202 and the lubricant pushed back from the atmosphere side reaches the side surface 202-1 of the bearing 202, the oil level OL of the lubricant is lower than that of the spindle 201, so that the atmosphere The lubricant pushed back from the side can be quickly returned to the inside of the bearing 202 through the groove 201c and the side surface 202-1 of the bearing 202 located below the spindle 201.

Therefore, the pump device 301 forms the groove 201c of the spindle 201 and arranges the oil seal 211 at a position where the lubricant from the bearing 202 scatters to the oil seal 211, so that the lubricant scatters to the outside and pollutes the surroundings. It is possible to reduce the maintenance work of replenishing or replacing the lubricant in the bearing body 204. Further, even when the pressing of the lip 211d is weakened due to aged deterioration, the lubricant leaking to the atmosphere side is returned to the sealed fluid side by the first flow FL1. As described above, the pump device 301 can secure the sealing property of the oil seal 211, and as a result, the pump device 301 can extend the replacement life of the oil seal 211. Further, during the operation of the pump 300, the lubricant is supplied to the sliding portion of the lip 211d and the spindle 201 by the second flow FL2 of the lubricant. Therefore, heat generation and wear due to friction on the sliding surface can be suppressed, and the life of the oil seal 211 and the spindle 201 can be extended.

Further, as shown in FIG. 20, a groove 201c is also formed on the outer peripheral surface of the spindle 201 facing the oil seal 212 arranged on the impeller 230 side, and the lubricant from the bearing 203 is scattered on the oil seal 212. By arranging the oil seal 212 at the position, it is possible to suppress leakage of the lubricant from the oil seal 212 while maintaining good sliding between the oil seal 212 and the spindle 201.

When the spindle 201 rotates in the counterclockwise direction when viewed from the impeller 230 side, the inclination direction of the groove 201c formed on the outer peripheral surface of the spindle 201 facing the oil seal 212 is the inclination direction when viewed from the impeller 230 side. On the left side surface, the impeller is inclined in a higher direction from the impeller 230 side toward the bearing 203 side.

A shaft sleeve (not shown) may be used for the sliding surface of the oil seal 211 or 212 of the spindle 201 for protection. Since the spindle 201 is fitted in the shaft sleeve, the spindle 201 and the shaft sleeve rotate concentrically in the radial direction. Therefore, the shaft sleeve is a part of the spindle 201. Further, also in the pump device 301 using the oil seal 211'in FIG. 13C, which will be described later, the oil seal 211'is formed at the position where the groove 201c is formed and the lubricant from the bearing 202 or 203 can be scattered on the oil seal 211'. By arranging the pump device 301, the pump device 301 can suppress the leakage of the lubricant to the atmosphere side while maintaining good sliding between the oil seal 211'and the main shaft 201. Further, also in the pump device 301 using the oil seal 211'' in FIG. 13D, the oil seal 211'' is provided at a position where the groove 201c is formed and the lubricant from the bearing 202 or 203 can be scattered on the oil seal 211''. By arranging the pump device 301, the pump device 301 can suppress the leakage of the lubricant to the atmosphere side while maintaining good sliding between the oil seal 211 ″ and the spindle 201.

Further, FIG. 11A illustrates and describes a pump device 301 using a single-stage single-suction centrifugal pump. However, the arrangement of the groove 201c and the bearing and the oil seal on the outer peripheral surface of the spindle 201 according to the present embodiment is such that an arbitrary pump device, particularly an oil bath type bearing using a lubricant, and an oil seal for sealing the lubricant of the bearing are sealed. , As well as horizontal axis pumping equipment with horizontal axis pumps.

A worker who performs maintenance on the pump device 301, which is an example of the embodiment, performs the following maintenance on the pump device 301 in FIG. 11 in which a predetermined amount or more of the lubricant leaks to the atmosphere due to aged deterioration. You can also. That is, the operator separates the oil seal 211 and the spindle 201 in FIGS. 12A and 12B, forms a groove 201c as shown in FIGS. 13A and 13B on the outer peripheral surface of the spindle 201, and then forms the original oil seal. By attaching the 211 or a new oil seal 211 and the spindle 201, the pump device 301 shown in FIG. 20 is obtained.

At this time, the oil seal 211 does not need to be completely separated from the spindle 201. The oil seal 211 may be a step of being slid on the spindle 201 and separated from the sliding surface with the spindle 201.

FIG. 13A is an enlarged cross-sectional view of the vicinity of the spindle 201, the oil seal 211, and the bearing 202 after maintenance. Further, FIG. 13B is a further enlarged view of the vicinity of the oil seal 211 (broken line portion in FIG. 13A) of FIG. 13A. As shown in the figure, an inclined groove 201c (unevenness) is formed on the outer peripheral surface of the spindle 201. When the spindle 201 rotates in the clockwise direction when viewed from the motor side, the inclination direction of the groove 201c near the oil seal 211 is the bearing 202 from the motor side on the right side surface when viewed from the motor side (spindle end 220 side). It is inclined in the direction of becoming higher toward the side.

By forming such a groove 201c, when the spindle 201 rotates, an air flow is generated by the groove 201c in the atmosphere. Then, the lubricant is pushed back from the atmosphere side to the sealed fluid side. That is, it can be said that the inclination direction of the groove 201c is a direction in which the lubricant on the atmospheric side is returned to the bearing 202 side when the spindle 201 rotates. This can prevent the lubricant from leaking.

If the groove 201c is formed at least on the atmospheric side of the spindle 201, the rotation of the spindle 201 causes an air flow to be generated by the groove 201c to have an effect of pushing back the lubricant. Further, the groove 201c may be formed or extended to at least a part of the sliding surface (or the lip groove 201b) on the main shaft 201 (reference numeral B in FIG. 13B). As a result, the friction between the oil seal 211 and the spindle 201 can be reduced. Further, the groove 201c may be formed or extended from the sliding surface (or lip groove 201b) of the spindle 201 to at least a part of the bearing 202 side (reference numeral C in FIG. 13B). This further enhances the effect of pushing the lubricant back to the bearing 202 side.

As described above, in the present embodiment, the oil seal 211 and the bearing 202 are arranged at positions where the lubricant scattered from the bearing 202 reaches the sliding surface between the oil seal 211 and the outer peripheral surface of the spindle 201. Then, as the spindle 201 rotates, a part of such a lubricant is pushed back to the bearing 202 side. As a result, the leakage of the lubricant is suppressed, and an appropriate amount of the lubricant is interposed on the sliding surface between the oil seal 211 and the spindle 201.

It should be noted that such maintenance can also be applied to the outer peripheral surface of the spindle 201 facing the oil seal 212 arranged on the impeller 230 side in FIG. That is, the operator separates the sliding surface between the oil seal 212 and the outer peripheral surface of the spindle 201, and the groove inclined toward the impeller 230 side (opposite side of the bearing 203) from the sliding surface between the oil seal 212 and the spindle 201. 201c may be formed. The inclination direction of the groove 201c formed on the spindle 201 facing the oil seal 212 is the direction in which the lubricant on the sliding surface is returned to the bearing 203 side when the spindle 201 rotates, and the oil seal on the bearing 202 side. It is the opposite of the groove 201c formed on the spindle 201 facing the 211.

Further, various oil seals can be applied.
FIG. 13C is an enlarged view when an oil seal 211'different from that of FIG. 13B is applied. The sealing sleeve 280 is provided as part of the spindle 201. The oil seal 211'includes a resin seal lip member 281 having an L-shaped cross section, and the seal lip member 281 has an outer bonded metal ring 282 having a substantially L-shaped cross section and an inner bonding metal ring 282 having a substantially L-shaped cross section. It is sandwiched by the presser metal ring 283. A tubular lip 284 is formed on the inner peripheral side of the seal lip member 281, and this tubular lip 284 corresponds to the lip 211d of FIG. 13B and tightly adheres to the outer peripheral surface of the sealing sleeve 280 to seal the sealed fluid. .. When the oil seal 211'shown in FIG. 13C is used, the groove 201c is formed in the seal sleeve 280 which is a part of the spindle 201.

FIG. 13D is an enlarged view when an oil seal 211 ″, which is different from that of FIG. 13B, is applied. The oil seal 211 ″ has a tubular portion 292. Depending on the installation environment, foreign matter such as dust may be mixed into the sliding surface between the oil seal and the outer peripheral surface of the spindle 201 from the atmosphere side. Therefore, the tubular portion 292 prevents foreign matter from entering the oil seal 211 ″. Therefore, the oil seal 211 ″ can reduce the wear of the sliding surface on the lip portion of the oil seal 211 ″ and the outer peripheral surface of the spindle 201 due to the mixing of foreign matter from the atmosphere side.

The maintenance procedure will be described in detail below.
FIG. 14 is a process diagram showing a maintenance procedure of the pump device 301. Note that FIG. 14 is merely an example of the procedure, and each step may be replaced or omitted as appropriate. In step S21 of FIG. 14, the maintenance of the present embodiment for the pump device 301 of FIG. 11A is started.

First, the operator disconnects the connection with the motor (not shown). (Step S21). Further, the operator removes the plug 216 and removes the lubricant from the bearing body 204 (step S22). Subsequently, the operator removes the bolt 238 for the pump body 232, and removes the intermediate plate 237, the body cover 221 and the bearing body 204 from the pump body 232 (step S23). As a result, the state shown in FIG. 15 is obtained.

After that, the operator removes the nut 231 for the impeller 230 and pulls out the impeller 230 from the spindle 201 (step S24). Then, the operator removes the key 219 on the impeller 230 side from the spindle 201. As a result, the state shown in FIG. 16 is obtained. Further, the operator removes the bolt 36 and removes the intermediate plate 237 and the fuselage cover 221 from the bearing fuselage 204 (step S25). Next, the operator removes the bolt 229 for the gland packing 223 and removes the gland packing 223 (step S26). As a result, the state shown in FIG. 17 is obtained.

Then, when the draining ring 213 is present, the operator pulls out the draining ring 213 from the spindle 201 (step S27). Next, the operator removes the bolts 210a and 210b for the bearing covers 205 and 206, removes the bearing covers 205 and 206 and the oil seals 211 and 212 from the bearing body 204, and pulls out the spindle 201 (step S28). As a result, the state shown in FIG. 18 is obtained. In this way, the spindle 201 is separated from the oil seals 211 and 212. When the spindle 201 is pulled out, the operator checks the rotational state of the bearings 202 and 203, and if smooth rotation is not possible, replaces the bearings 202 and 203.

Then, the operator forms the groove 201c described with reference to FIGS. 13A and 13B in the vicinity of the bearings 202 and 203 on the spindle 201 (step S29). As a result, the state shown in FIG. 19 is obtained. Specifically, the operator forms the groove 201c by scratching the outer peripheral surface of the spindle 201. It is desirable that the groove 201c is formed over the entire circumference, but there may be a portion where the groove 201c is not provided.

After that, the operator may replace the oil seals 211 and 212 with new ones as necessary, and assemble the pump in the reverse procedure. As a result, it can be said that a new pump device (lubricant leak suppression pump device) with less lubricant leakage shown in FIG. 20 is manufactured.

As described above, in the present embodiment, the maintenance worker makes a simple method of forming a groove 201c by scratching the outer peripheral surface of the spindle 201 in a predetermined direction, and the lubricant leaks along the spindle 201. Can be suppressed.

For maintenance, the operator may not form the groove 201c on the spindle 201, but may provide the groove 201c on the outer peripheral surface of the spindle 201 of the new pump in advance. Further, in FIG. 11A, a pump device 301 using a single-stage single-suction centrifugal pump has been illustrated as an example, but any pump device, particularly an oil bath type bearing using a lubricant, an oil seal, and a horizontal axis pump, has been described. This embodiment can be applied to a horizontal axis pump device provided with the above.

The pump device 301 maintained by the above procedure can reduce the maintenance work of replenishing or replacing the lubricant due to the leakage of the lubricant. Further, even if the pressing of the lip 211d becomes weak due to aged deterioration, the pump device 301 maintained by the above procedure secures the sealing property by returning the lubricant to the bearing body 204 by the first flow FL1. As a result, the replacement life of the oil seal 211 can be extended. Further, during the pump operation, the lubricant is supplied between the lip 211d and the sliding portion on the outer peripheral surface of the spindle 201 by the second flow FL2 of the lubricant. Therefore, since the sliding surface of the oil seal 211 and the spindle 201 can suppress heat generation and wear due to friction, the life of the oil seal 211 and the spindle 201 can be extended. The groove 201c can also be applied to the outer peripheral surface of the bearing 203 and the oil seal 212 arranged on the impeller 230 side in FIG. 11 and the main shaft 201 facing the bearing 203 and the oil seal 212.

21 and 22 are tables showing an example of comparing the leakage of the lubricant between the pump device of FIG. 11A and the pump device of FIG. 20. The table of FIG. 21 shows the result of the maintenance worker periodically confirming the leakage of the lubricant at the time interval TMx at the site where the pump 300 is continuously operated. Therefore, TM0 to TM9 in FIGS. 21 and 22 indicate the period after the start of operation of the pump devices 310 and 311. Specifically, n times the time interval TMx (n) after the start of operation of the pump devices 310 and 311. : The period from 0 to 9). In general, the pump device is regularly maintained every 3 months to 1 year. Hereinafter, for the sake of simplicity, only the oil seal 211 will be described, but the same effect can be observed for the oil seal 212.

Here, a pump device showing the result of lubricant leakage will be described with reference to FIGS. 21 and 22. The pump device 310 is a pump device in which the groove 201c is not provided on the outer surface of the spindle 201, and is the pump device 301 shown in FIG. 11A. The pump device 311 of FIG. 21 is the pump device 301 shown in FIG. That is, the pump device 310 differs from the pump device 311 only in that the groove 201c is not formed on the outer surface of the spindle 201. Specifically, the pump device 311 is formed by forming an inclined groove 201c on the outer surface of the spindle 201 of the pump device 310 according to the maintenance procedure of FIG. 14 in the pump device 310 that has been used by the maintenance worker for a period of TM8 or more. And said.

Further, in the oil seal 211 which is a sealing member of the pump devices 310 and 311, the lip 11d is hardened due to aged deterioration and the sealing property is deteriorated. Therefore, the oil seal 211 is a consumable part. Even at this site, maintenance workers replace new products when they have reached the end of their useful life. Further, the lubricant leak indicates a state in which the lubricant leaked from the oil seal 211 to the atmosphere side is scattered from the outer surface of the spindle 201. That is, the state in which the lubricant on the atmospheric side scatters from the spindle 201 and pollutes the surroundings is referred to as "lubricant leakage".

When the service life of the oil seal 211 is reached, the lip 211d of the oil seal 211 is hardened and the sealing action is significantly reduced. The service life of the oil seal 211 varies depending on the usage environment of the pump device, the lubricant, etc., but is generally about 2 to 5 years. Further, in the maintenance shown in FIGS. 21 and 22, when the lubricant leaking to the atmosphere exceeds the leakage allowance Mx, it is determined that the service life of the oil seal 211 has been reached. The leakage allowance Mx varies depending on the installation environment of the pump device 300 and the operator, but in general, the maintenance worker causes the lubricant leaked from the oil seal 211 to the atmosphere side to adhere to the ground along the support base 218. If it is in a state where the lubricant is constantly confirmed to be scattered from the main shaft 201, it is determined that the leakage allowance Mx has been exceeded.

FIG. 21 shows the amount of lubricant leaked for each maintenance frequency.
During the first maintenance, that is, when the oil seal 211 and the spindle 201 were used for the period TM1, the maintenance worker confirmed a small amount of lubricant leakage (trace of several drops) in the pump device 310. , Lubricant leakage could not be confirmed in the pump device 311.

During the second maintenance, that is, when the oil seal 211 and the spindle 201 were used for the period TM2, the maintenance worker confirmed a small amount of lubricant leakage (trace of several tens of drops) on the pump device 310. On the other hand, the pump device 311 could not confirm the lubricant leakage.

At the time of the fourth maintenance, that is, when the oil seal 211 and the spindle 201 were used for the period TM4, the maintenance worker confirmed the leakage of lubricant to both the pump devices 310 and 311. It is considered that this is because the lip 211d was hardened due to aged deterioration and the sealing action was deteriorated. However, the lubricant leakage of the pump device 310 has reached the leakage allowance Mx or more, whereas the lubricant leakage of the pump device 311 is less than the leakage allowance Mx. Therefore, the maintenance worker determined that the oil seal 211 of the pump device 310 had reached the end of its useful life and replaced it. Further, as preventive maintenance, the oil seal 211 of the pump device 311 which has not reached the end of its useful life was also replaced.

During the fifth maintenance, that is, when the replaced oil seal 211 is used for period TM1 and the spindle 201 is used for period TM5, the maintenance worker has a small amount of lubricant leak (traces of tens of drops) in the pump device 310. ) Was confirmed, but the lubricant leak could not be confirmed by the pump device 311. Here, the pump device 310 has confirmed a small amount of lubricant leakage during the period TM1 even though the oil seal 211 has been replaced in the fourth maintenance. It is considered that this is due to the formation of the lip groove 201b on the spindle 201 of the pump device 310.

At the time of the sixth maintenance, that is, when the replaced oil seal 211 is used for the period TM2 and the spindle 201 is used for the period TM6, the maintenance worker causes a small amount of lubricant leakage (trace of several tens of drops) in the pump device 310. ) Was confirmed, but the lubricant leak could not be confirmed by the pump device 311.

During the 7th maintenance, that is, when the replaced oil seal 211 was used for the period TM3 and the spindle 201 was used for the period TM7, the maintenance worker confirmed an oil leak in the pump device 310 (a small amount of oil leak). Is always confirmed), but the lubricant leak could not be confirmed in the pump device 311.

As described above, according to the pump device 311, the lubricant leakage can be suppressed as compared with the pump device 310.

FIG. 22 is a graph showing the results shown in the table of FIG. 21 as changes over elapsed time. 22 (A) shows the change in the elapsed time of the amount of lubricant leak of the pump device 310, and FIG. 22 (B) shows the change in the elapsed time of the amount of lubricant leak of the pump device 311. In both FIGS. 22A and 22B, the horizontal axis shows the elapsed time, and the vertical axis shows the amount of lubricant leaked. Further, the dotted lines in FIGS. 22 (A) and 22 (B) indicate the leakage allowance Mx.

In period TM3, the pump device 310 has a small amount of lubricant leak as shown in region R1 of the graph, whereas in pump device 311 it is more lubricated than pump device 310 as shown in region R2 of the graph. It is possible to suppress the leakage of the agent.

After the lapse of the period TM3 In the period T1 until the lapse of the period TM4, the leakage amount of the lubricant of the pump device 310 increases, and further, the leakage allowance Mx is exceeded after the lapse of the period TM4. It was determined that the service life of the oil seal 211 in 310 was reached. Therefore, both the pump devices 310 and 311 have their oil seals 211 replaced after the period TM4 has elapsed from the start of operation. Here, as shown in FIG. 22, in the period T1, unlike the pump device 310, the pump device 311 was confirmed to have a lubricant leak of less than the leakage allowance Mx, and the oil seal 211 did not reach the end of its useful life. It can be used continuously even after the period TM4. However, the operator replaced the oil seal 211 of the pump device 311 for preventive maintenance. Similarly, in the period T2 after the lapse of the period TM7 and until the lapse of the period TM8, both the pump devices 310 and 311 have a lubricant leak due to the aged deterioration of the oil seal 211, but the pump device 311 is compared with the pump device 310. The amount of leakage is small.

In the period T3 after the period TM4, it was confirmed that the lip groove 201b was formed in the spindle 201 by sliding the oil seal 211 with respect to the spindle 201 in both the pump devices 310 and 311.

In the period after the oil seal 211 is replaced and after the period TM4 elapses until the period TM7 elapses, the pump device 310 has a small amount of lubricant leakage as shown in the area R3 of the graph of FIG. 22, whereas the pump device has a small amount of lubricant leakage. As shown in the area R4 of the graph of FIG. 22, the 311 can suppress the lubricant leakage more than the pump device 310. As described above, even if the lip groove 201b is formed in the spindle 201, the pump device 311 can suppress the lubricant leakage more than the pump device 310.

As shown in FIGS. 21 and 22, in the period T1 and the period T2 in which the oil seal 211 does not operate normally due to the aged deterioration of the oil seal 211, the mass of the lubricant leaked to the atmosphere side in both the pump devices 310 and 311. Therefore, the lubricant is scattered by the centrifugal force due to the rotation of the spindle 201. However, while the oil seal 211 works normally and the amount of leakage is small, the lubricant leaking to the atmosphere side of the pump device 311 has an increased contact area with the spindle 201 due to the groove 201c as compared with the pump device 310. , It becomes difficult to scatter from the spindle 201. In addition, the lubricant exposed on the outer peripheral surface of the main shaft 201 on the atmospheric side of the pump device 311 is immediately returned to the sealed fluid side by the first flow FL1 by the inclined groove 201c. Therefore, the pump device 311 can suppress the leakage of the lubricant from the oil seal 211 as compared with the pump device 310.

Further, as described above, since the pump device 301 is often installed in a pump chamber or the like, the oil can be pressed by about 20% to 80% as compared with the pressing of the lip 211d in a general oil seal. The life of the seals 211 and 212 may be extended. As described above, even in the pump device in which the pressure of the lip 211d is weak, if the groove 201c inclined to the spindle 201 is formed, the lubricant leaking to the atmosphere side is returned to the sealed fluid side by the first flow FL1. Lubricant leakage can be suppressed. Further, since a small amount of lubricant leakage of about the pump device 310 described above is often tolerated, the groove 201c inclined to the spindle 201 by the maintenance method described above in FIG. 14 is requested by the pump operator. May be formed.

As described above, the pump device 301 according to the second embodiment can rotate the spindle 201 and the spindle 201 that rotate the impeller 230 that pressurizes the conveyed liquid by driving the electric motor, which is an example of the drive, in a predetermined direction. This is an example of a bearing 202 that supports the bearing 202, a bearing cover 205 through which the spindle 201 penetrates, and a sealing member that prevents the lubricant of the bearing 202 from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle 201. It is provided with an oil seal 211. The bearing cover 205 is configured so that the lubricant scattered from the bearing 202 flows through the bearing cover 205 to the oil seal 211. Further, in the pump device 301, the outer peripheral surface of the spindle 201 has an inclined groove 201c in which the lubricant exposed on the outer peripheral surface of the spindle 201 on the atmospheric side is pushed back to the sealed fluid side when the spindle 201 rotates. It is provided.

With this configuration, the lubricant scattered from the bearing 202 and flowing through the bearing cover 205 to the oil seal 211 is returned from the atmosphere side to the sealed fluid side by the pumping action of the groove 201c on the outer peripheral surface of the spindle 201, and the lubricant leaks. Can be suppressed.

Further, the pump device 301 is a horizontal axis type pump device provided with a horizontal axis pump 300. With this configuration, the fluid to be sealed can be sealed by the action of the oil seal 211 while the spindle 201 is stationary.

Further, the inclined groove 201c is provided in at least a part of the outer peripheral surface of the main shaft 201 on the atmosphere side. With this configuration, as the spindle 201 rotates, a wind is generated in the direction of the bearing 202 at least a part of the outer peripheral surface of the spindle 201 on the atmosphere side, and the wind pushes the lubricating oil toward the bearing 202. Is done. Further, the lubricating oil is returned toward the bearing 202 by the pumping action.

Further, if the seal member is an oil seal 211 incorporated in the bearing cover 205, the lubricant scattered from the bearing 202 is supplied to the oil seal 211 through the bearing cover 205, whereby the oil seal 211 and the spindle 201 are supplied. Since the lubricant is supplied between the oil seal 211 and the main shaft 201, the sliding of the oil seal 211 and the spindle 201 can be kept good. Further, since the inclined groove 201c is formed, the lubricant exposed on the outer peripheral surface of the spindle 201 on the atmospheric side is pushed back from the oil seal 211 to the bearing 202 side by the pumping action, so that the lubricant is pushed back to the atmospheric side. It can suppress leakage.

<Third embodiment>
Subsequently, the third embodiment will be described. FIG. 23 is a vertical sectional view showing a partial configuration of the pump device according to the comparative example. FIG. 23 is a vertical cross-sectional view showing a partial configuration of the pump device according to the comparative example, and FIG. 24 is a cross-sectional view of the pump device of FIG. 23 in X. The pump device 401 shown in FIG. 23 differs from the pump device 301 shown in FIG. 20 in the shape of the bearing cover 405. Therefore, the same reference numerals are used for the configuration of the same function as the pump device 301 of FIG. 20, and some description thereof will be omitted. As shown in FIG. 24, on the surface of the bearing cover 405 on the spindle 201 side, the portion below the oil level of the lubricating oil OL is the bottom surface portion 405b, and the surface facing the bottom surface portion 405b across the axis is the ceiling surface portion 405u. The surfaces other than the bottom surface portion 405b, the bottom surface portion 405b, and the ceiling surface portion 405u are referred to as side surface portions 405a. Further, the end portion on the bearing side of the ceiling surface portion 405u of the bearing cover 405 is referred to as a bearing side end portion 405u1, and the end portion on the seal member side is referred to as a seal member side end portion 405u2. Although the cross section of the bearing cover 405 shown in FIG. 24 is substantially circular, it may be polygonal regardless of this.

The bearing cover 405 in the pump device 401 according to this comparative example will be described. The distance Ln1 between the bearing 202 of the bearing cover 405 through which the spindle 201 penetrates and the surface of the bearing cover 405 facing the bearing 202 exceeds the distance Ln0 at which the lubricant scatters from the bearing 202 during the operation of the pump 300. That is, the distance Ln1 is longer than the distance Ln0. And / or, as shown by the broken line L1 in FIG. 23, when the line connecting the apex from the bearing side end portion 405u1 to the seal member side end portion 405u2 of the ceiling surface portion 405u of the bearing cover 405 is substantially horizontal, FIG. 23 or As shown by the arrow FLn1 in FIG. 24, the oil droplet Od of the lubricant (lubricating oil as an example here) scattered from the bearing 402 to the ceiling surface portion 405u is on a plane substantially perpendicular to the axis of the inner circumference of the bearing cover 405. It travels down to the bottom surface portion 405b on the inner surface of the bearing cover 405 or the spindle 201. Therefore, the lubricating oil supplied to the oil seal 211 through the bearing cover 405 is significantly reduced, and the lubricating oil is returned to the bearing 402 side by the pumping action of the groove 201c formed on the surface of the spindle 201. There is a problem that the lubricant on the sliding surface of the main shaft 201 is insufficient, and the friction between the main shaft 201 and the oil seal 211 makes a noise, or the lip 211d is worn and the life of the oil seal 211 is shortened.

As described above, if the heat generated by the bearing 202 in the continuous operation of the pump 300 is transmitted to the lip 211d of the oil seal 211 via the spindle 201, the lip 211d may be hardened and the life of the oil seal 211 may be shortened. Therefore, a predetermined distance (Ln1) is required between the bearing 202 and the oil seal 211. Therefore, the bearing cover according to the third embodiment has a structure on the inner peripheral surface for guiding the lubricant scattered on the bearing cover to the oil seal 211. With this configuration, the lubricant can be supplied to the oil seal 211 even if the distance Ln1 is longer than the distance Ln0 at which the lubricant is scattered from the bearing 202. Hereinafter, the bearing cover 505 according to the third embodiment will be specifically described.

FIG. 25 is a vertical sectional view showing a partial configuration of the pump device according to the third embodiment. The pump device 501 shown in FIG. 25 differs only in the shape of the bearing cover 505 from the pump device 401 according to the comparative example of FIG. 23. Therefore, hereinafter, the same reference numerals are used for the configuration of the same function as the pump device 301 of FIG. 20, and the description thereof will be omitted. As shown in FIG. 24, on the surface of the bearing cover 505 on the spindle 201 side, the portion below the oil level of the lubricating oil OL is the bottom surface portion 505b, and the surface facing the bottom surface portion 505b across the axis is the ceiling surface portion 505u. The surfaces other than the bottom surface portion 505b, the bottom surface portion 505b, and the ceiling surface portion 505u are referred to as side surface portions 505a. Further, the end portion on the bearing side of the ceiling surface portion 505u of the bearing cover 505 is referred to as a bearing side end portion 505u1, and the end portion on the seal member side is referred to as a seal member side end portion 505u2.

In the pump device 501 according to the third embodiment, the length Lm1 between the bearing 202 and the surface of the bearing cover 505 through which the spindle 201 penetrates facing the bearing 202 exceeds the distance Lm0 at which the lubricant flies from the bearing 202. ing. As shown by the broken line L2 in FIG. 24A, in the pump device 501, as a structure for guiding the lubricant to the oil seal 211, a surface including at least a part of the ceiling surface portion 505u of the inner peripheral surface of the bearing cover 505. Is inclined so as to approach the main shaft 201 as it approaches the oil seal 211. Specifically, the inner peripheral surface of the bearing cover 505 is inclined from the bearing side end portion 505u1 toward the seal member side end portion 505u2 at an angle θm from the horizontal broken line L1. The inner diameter on the oil seal 211 side is smaller than the inner diameter on the bearing 202 side. That is, with this configuration, the bearing cover 505 forms the flow (second flow FL2) shown by the arrow FLm1 in FIG. 25, and the groove 201c seals the lubricant leaked to the atmosphere side of the outer peripheral surface of the spindle 201. Form a first flow FL1 to return to the fluid side. As a result, the lubricant is supplied to the oil seal 211 along the inclination of the inner peripheral surface of the oil seal 211, so that the lubricant is supplied to the sliding surfaces of the oil seal 211 and the spindle 201, and the groove 201c is pumped. By action, the lubricant is returned to the sealed fluid side.

The above-mentioned angle θm depends on the amount and viscosity of the scattered lubricant and the distance Lm1. Further, if the distance Lm1 is long, the lubricant tends to fall before reaching the seal member side end portion 505u2, so that the distance Lm1 and the angle θm are preferably proportional.

<Fourth Embodiment>
Subsequently, the fourth embodiment will be described. FIG. 26 is a vertical sectional view showing a partial configuration of the pump device according to the fourth embodiment. As shown in FIG. 26, the pump device 601 according to the fourth embodiment further includes a deflector member 640 as compared with the pump device 401 according to the comparative example of FIG. 23. Therefore, the same reference numerals are used for the configurations equivalent to those of the pump device 401, and the description thereof will be omitted. The deflector member 640 is arranged between the bearing 202 and the oil seal 211 and is attached to the spindle 201. The deflector member 640 is a draining brim and shakes off the liquid flowing along the rotating spindle 201.

According to this configuration, as shown by the arrow in FIG. 26, when the lubricant scattered from the bearing 202 could not reach the oil seal 211 through the bearing cover 405 and fell to the spindle 201, the deflector member 640 fell. The lubricant is again blown onto the bearing cover 405 by centrifugal force. The blown lubricant is supplied to the oil seal 211 through the bearing cover 405. As a result, the lubricant is supplied to the sliding surfaces of the oil seal 211 and the spindle 201. This lubricant is returned to the bearing 202 side by the pumping action of the groove 201c formed on the surface of the spindle 201. A part of the lubricant returned to the bearing 202 side by the pumping action of the groove 201c is blown to the bearing cover 405 by the deflector member 640, so that the lubricant is supplied to the sliding surfaces of the oil seal 211 and the spindle 201. ..

In the fourth embodiment, the bearing cover 205, the bearing cover 505, or the bearing cover 705 described later may be used instead of the bearing cover 405.

<Fifth Embodiment>
Subsequently, a fifth embodiment will be described. FIG. 27 is a cross-sectional view showing a partial configuration of the pump device according to the fifth embodiment. FIG. 28 is a cross-sectional view of arrow A in the pump device of FIG. 27. As shown in FIGS. 27 and 28, the pump device 701 according to the fifth embodiment further includes a guide member 750 that constitutes a part of the bearing cover 705 as compared with the pump device 401 according to the comparative example of FIG. Be prepared. Therefore, the same reference numerals are used for the same configuration as the pump device 401, and some description thereof will be omitted.

The bearing cover 705 includes a bearing cover main body 710 and a guide member 750 that guides the lubricant scattered from the bearing 202 to the oil seal 211. The bearing cover main body 710 has the same shape as the bearing cover 405. The guide member 750 has a structure for guiding the lubricant to the oil seal 211, and the configuration of the bearing cover 705 forms a second flow FL2 for guiding the lubricant scattered from the bearing 202 to the oil seal 211. Can be done.

As shown in FIG. 28, the bearing cover 705 is a guide member having a width W extending along the long axis direction of the spindle 201 on the inner peripheral surface including the uppermost portion of the inner peripheral surface of the bearing cover main body 710. 750 is provided, and as shown in FIG. 27, the surface 750u of the guide member 750 facing the spindle 201 approaches the spindle 210 as it approaches the oil seal 211 from the bearing 202 side along the long axis direction of the spindle 210. Is inclined to.
With this configuration, the lubricant flows along the inclination of the surface 750u facing the main shaft 201 of the guide member 750, so that the lubricant can be supplied to the oil seal 211. Further, since the space S can be made wider than that of the pump device 501, the temperature rise in the space S can be suppressed, which leads to a longer life of the oil seal 211.

<Modification 1>
Subsequently, a modification 1 of the fifth embodiment will be described. FIG. 29 is a cross-sectional view of arrow A in the pump device of FIG. 27 in the pump device according to the first modification of the fifth embodiment. FIG. 30 is a cross-sectional view taken along the line BB'in FIG. 29.

As shown in FIG. 29, the bearing cover 705 is provided with a protrusion-shaped guide member 750a having a thickness H extending from the bearing 202 side to the oil seal 211 in the long axis direction of the main shaft 201 on the inner peripheral surface of the bearing cover main body 710. ing. As shown in FIG. 30, the pair of guide members 750a are arranged so as to extend substantially horizontally in a vertical cross section (for example, a BB'cross section shown in FIG. 30) parallel to the major axis direction and including the guide member 750a. There is.

With this configuration, the lubricant scattered from the bearing 202 adheres to the upper surface of the inner peripheral surface of the bearing cover main body 710, and then falls on the guide member 750a along the inner peripheral surface of the bearing cover main body 710 in the circumferential direction. The second flow FL2) of FIG. 29. The lubricant that has fallen on the guide member 750a moves along the guide member 750a to the oil seal 211 due to inertia (second flow FL2 in FIG. 30). With such a second flow FL2, the lubricant can be supplied to the oil seal 211. In the present embodiment, the guide member 750a is provided at a position including a horizontal plane passing through the axis on the inner peripheral surface of the bearing cover main body 710, but the upper surface of the guide member 750a is on the inner peripheral surface of the bearing cover main body 710. It may be provided at a position above the horizontal plane passing through the axis. As a result, the guide member 750a can supply more lubricant to the oil seal 211 than the guide member 750. The upper surface of the guide member 750a may be provided at a position higher than the position where the height is the lowest among the sliding surfaces of the oil seal 211 and the spindle 201. As a result, after the lubricant has flowed on the upper surface of the guide member 750a, the lubricant can be supplied to the sliding surfaces of the oil seal 211 and the spindle 201.

<Modification 2>
Subsequently, the second modification of the fifth embodiment will be described. FIG. 31 is a cross-sectional view of arrow A in the pump device of FIG. 27 in the pump device according to the second modification of the fifth embodiment. FIG. 32 is a cross-sectional view taken along the line CC'of FIG. 31.

As shown in FIG. 31, a protrusion-shaped guide member 750c having a thickness H extending from the bearing 202 side to the oil seal 211 in the long axis direction of the spindle 201 is provided on the inner peripheral surface of the bearing cover main body 710. Further, as shown in FIG. 32, the pair of guide members 750c is parallel to the major axis direction of the spindle 201 and has a vertical cross section including the guide member 750c (for example, a CC'cross section shown in FIG. 32) from the bearing 202 side. It is inclined downward as it approaches the oil seal 211 along the major axis direction of the spindle 201.

With this configuration, the lubricant scattered from the bearing 202 adheres to the upper surface of the inner peripheral surface of the bearing cover main body 710, and then falls on the guide member 750c along the inner peripheral surface of the bearing cover main body 710 in the circumferential direction. The lubricant that has fallen on the guide member 750c moves along the guide member 750c to the oil seal 211 according to the inclination provided on the guide member 750c. In this way, the lubricant can be supplied to the oil seal 211.
In the present embodiment, as shown in FIG. 32, the guide member 750c is provided below the horizontal plane passing through the axis on the inner peripheral surface of the bearing cover main body 710, but the lower end of the guide member 750c (oil seal 211 side). The upper surface of the end portion) may be provided above the oil seal 211. As a result, the guide member 750c can supply the lubricant to the oil seal 211 more quickly than the guide member 750a. The upper surface of the lower end (the end on the oil seal 211 side) of the guide member 750c may be provided at a position higher than the lowest height of the sliding surfaces of the oil seal 211 and the spindle 201. As a result, after the lubricant has flowed on the upper surface of the guide member 750c, the lubricant can be supplied to the sliding surfaces of the oil seal 211 and the spindle 201.

Further, although the guide members 750a and 750c form a pair, only one of them may be used, or a plurality of three or more guide members may be provided on the bearing cover main body 710. When there are a plurality of guide members 750a or 750c, they may have different shapes. Further, the guide member 750, the guide member 750a, and the guide member 750c may be combined.

Further, according to the third to fifth embodiments described above, the maintenance procedure shown in FIG. 14 can be used to suppress lubricant leakage in the conventional pump device without any difference from the conventional procedure. .. Specifically, as an example, after removing the bearing cover 205 in step 28 of FIG. 14, a groove 201c is formed in the spindle 201 in step S29. After that, the bearing cover 405 may be attached, and thereafter, the pump device may be assembled by a normal procedure. By forming the groove 201c in the spindle 201 and attaching the bearing cover 405 instead of the bearing cover 205 in this way, it is possible to suppress the leakage of lubricating oil at the installation site of the pump device. A deflector member 640 may be further provided between the bearing 202 of the pump device of the third embodiment and the fifth embodiment and the seal member.

<Sixth Embodiment>
Subsequently, the sixth embodiment will be described. The pump device according to the sixth embodiment is provided with an enclosure member for detecting the leakage of the lubricant from the oil seal. FIG. 33 is a schematic diagram showing a schematic configuration of the pump device according to the sixth embodiment. As shown in FIG. 33, the pump device 801 according to the sixth embodiment includes a pump 800 and an electric motor 860 in which a rotary shaft 861 is connected to a spindle 820 of the pump 800 via a coupling. Here, since the configuration of the pump 800 is the same as that of the pump 300 according to the second embodiment, detailed description thereof will be omitted. Further, the pump device 801 has a suction pipe 830 that communicates with the pump 800 and allows water sucked up from the water tank to pass through, and a discharge pipe 840 that communicates with the pump 830 and allows water discharged from the pump 800 to pass through. And. Further, the pump device 801 includes an enclosure member 870, a pump 800, an enclosure member 870, and a gantry 880 for supporting the electric motor 860.

FIG. 34 is a sectional view taken along the line DD of FIG. 33. As shown in FIG. 34, in a cross section substantially perpendicular to the long axis of the spindle 820, the spindle 820 is covered with an oil seal 811, and the oil seal 811 is covered with a bearing cover 805. Further, the bearing cover 805 is covered with the surrounding member 870 at intervals. As a result, when the lubricant leaking from the oil seal 811 to the atmosphere is scattered by the rotation of the spindle 820, the scattered lubricant adheres to the inner surface of the enclosure member. Thereby, by observing the inner surface of the enclosure member, the inspector who inspects the leakage of the lubricant of the oil seal 811 can confirm the amount of the lubricant scattered from the oil seal 811. For example, the lubricant leak shown in FIGS. 21 and 22 is equal to the lubricant attached to the inner surface of the enclosure member.

The above-described embodiment and modification can be applied to the oil seal 211 ′ or the oil seal 211 ″ as the seal member instead of the oil seals 211 and 212. Further, in the above-described embodiment and modification, as an example of a sealing member that seals between the spindle 201 and the bearing cover 205 that are concentrically arranged inside and outside the radial direction, the oil seals 211 and 212 are replaced with non-contact. The seal can be applied.

<7th Embodiment>
FIG. 35 is a cross-sectional view showing a partial configuration of the pump device according to the seventh embodiment. The same reference numerals are used for the configurations equivalent to those in FIG. 20, and the description thereof will be omitted. The seal member 511b shown in FIG. 35 is a labyrinth seal which is a kind of non-contact seal. Specifically, labyrinth grooves 541 and 542 called labyrinths are provided in the through portion of the spindle 201 of the bearing cover 205, that is, the flange surface 540 facing the outer peripheral surface of the spindle 201 in the bearing cover 205. The seal member 511b is composed of a flange surface 540 and labyrinth grooves 541 and 542. According to the labyrinth groove structure, the lubricant that has entered the gap between the flange surface 540 and the spindle 201 along the side surface of the bearing cover 205 stays in the labyrinth grooves 541 and 542 due to the surface tension of the lubricant, and stays in the labyrinth groove 541 and 542. It is guided downward along 541 and 542.

In the present embodiment, the gap between the flange surface 540 and the outer peripheral surface of the spindle 201 partitions the atmosphere side on the spindle end 220 side and the sealed fluid side on the bearing 202 side. Also in the pump device of the present embodiment, if the groove 201c inclined to the spindle 201 is formed, the lubricant on the spindle 201 is returned to the sealed fluid side by the first flow FL1 and the lubricant leakage can be suppressed.

The groove 201c may be formed at least in a region of the outer peripheral surface of the main shaft 201 that is adjacent to the region facing the flange surface 540 toward the atmosphere (region of reference numeral A1 in FIG. 35). Further, the inclined groove 201c may be provided in a region of the outer peripheral surface of the main shaft 201 facing the flange surface 540 (region of reference numeral B1 in FIG. 35). Further, the inclined groove 201c may be provided in at least a part of the outer peripheral surface of the main shaft 201 on the sealed fluid side (the region of reference numeral C1 in FIG. 35). That is, the groove 201c may be formed in at least a part on the atmospheric side adjacent to the facing surface of the flange surface 540 on the outer peripheral surface of the main shaft 201, and may extend further to the sealed fluid side. As a result, leakage of the lubricant can be suppressed in the same manner as in the configuration in which the oil seal is used for the seal member.

As described above, if the groove 201c inclined to the spindle 201 is formed regardless of the type of the sealing member, the lubricant supplied to the sealing member by the second flow FL2 leaks to the atmosphere side. It can be returned to the sealed fluid side by the flow FL1 and the leakage of the lubricant can be suppressed. Therefore, it can be applied to various pump devices.

Here, an inclined groove formed on the spindle according to the above-described embodiment and modification will be described. Hereinafter, as an example, the pump device 301 shown in FIG. 11A will be referred to as a pump device 310, and the pump device 301 shown in FIG. 20 will be referred to as a pump device 311.

The groove 201c is inclined so that when the pump 300 operates and the spindle 201 rotates, the lubricant exposed on the outer peripheral surface of the spindle 201 on the atmospheric side is returned to the sealed fluid side. That is, when the pump 300 operates and the spindle 201 rotates, the groove 201c is inclined so that the lubricant on the outer peripheral surface of the spindle 201 is returned from the atmosphere side to the sealed fluid side. Specifically, the inclined groove 201c is a fluid to be sealed from the atmosphere side on the right side surface when viewed from the motor side (spindle end 220 side) when the spindle 201 rotates in the clockwise direction when viewed from the motor side. It is a plurality of linear unevenness inclined in the direction of increasing toward the side. Here, in the sliding portion between the outer peripheral surface of the spindle 201 and the oil seal 212 (the pressure contact surface between the lip 212d and the outer peripheral surface of the spindle 201), the space on the bearing 203 side is the sealed fluid side and the impeller 30 side. Space is on the atmosphere side. Then, it is provided in at least a part of the outer peripheral surface of the spindle 201, which is adjacent to the region facing the seal member toward the atmosphere. Further, the inclined groove 201c may extend from the atmosphere side to the sealed fluid side of the outer peripheral surface of the main shaft 201.

The linear unevenness of the groove 201c is a plurality of linear unevenness substantially parallel to each other, and the linear unevenness includes a line that is slightly curved or interrupted in the process of being formed. Further, a plurality of linear irregularities of the groove 201c are formed at predetermined intervals, and the predetermined intervals are, for example, about 10 μm to 500 μm, and different intervals may be mixed even at equal intervals.

The surface roughness of the spindle 201 on which the groove 201c of the pump device 311 is formed may be equal to or greater than the surface roughness of the sliding surface of the spindle 201 of the pump device 310 with the oil seal 211. For example, either the maximum height roughness Rz or the center line average roughness Ra in the surface roughness of the spindle 201 on which the groove 201c of the pump device 311 is formed is the same as the oil seal 211 of the spindle 201 of the pump device 310. It is preferable that the sliding surface is equal to or higher than that of the sliding surface. However, when the surface roughness of the spindle 201 becomes large, the lip 11d wears faster. Therefore, the maximum height roughness Rz of the spindle 201 in which the groove 201c of the pump device 311 is formed is preferably 0.8 μmRz to 200 μm Rz. The average roughness Ra of the center line of the spindle 201 in which the groove 201c of the pump device 310 is formed is preferably 0.1 μmRa to 50 μmRa.

As described above, the groove 201c is fine, and the lubricant flowing to the seal member by the second flow FL2 during the operation of the pump 300 forms an oil level covering a plurality of irregularities of the groove 201c. As a result, the contact area between the spindle 201 and the lubricant increases, and it is possible to prevent the lubricant leaking from the seal member to the atmosphere from scattering from the spindle 201. Further, the lubricant on the spindle 201 can be prevented from being returned to the sealed fluid side and leaking to the atmosphere side by the pumping action of the groove 201c.

Generally, the spindle 201 on which the oil seal 211 slides is finished by a processing method that uses a finishing tool such as a grinding machine and does not feed (that is, does not move the finishing tool in the axial direction). It is said that the direction of the streaks, which are the processing scratches of the finish, is preferably substantially perpendicular to the axis. The operator forms a groove 201c in which the machining scratch is inclined with respect to the axis by the above-mentioned maintenance procedure on the spindle 201 of the pump device 310 finished so that the machining scratch is substantially perpendicular to the axis. May be good. At this time, the operator may use a finishing tool equivalent to the spindle 201 of the pump device 310 to perform finishing while feeding (that is, moving the finishing tool in the axial direction).

The notation of the surface roughness (maximum height roughness Rz, center line average roughness Ra) is based on JISB0601: 2001. Further, the surface roughness of the spindle 201 on which the groove 201c of the pump device 310 is formed indicates the surface roughness in the cross section perpendicular to the line direction of the groove 201c.

Patent Document 5 discloses that when the surface roughness of the shaft 201 is 2.5 μm or more, it causes leakage at rest. On the other hand, in the pump device 311 according to the embodiment of the present invention, the height of the oil level OL of the lubricant when the pump 300 is stopped is lower than the sliding surface of the oil seal 211 and the spindle 201. Further, when the lubricant is grease, the grease is cooled and solidified while the rotating shaft 201 is stationary, and the oil level of the lubricant does not exist. Therefore, the liquefied grease does not act on the sliding surfaces of the oil seal 211 and the spindle 201. Hereinafter, the lubricating oil or the liquefied grease will be referred to as a sealed fluid, as compared with the operation of forming the second flow FL2 in the horizontal axis type pump device 311 provided with the horizontal axis pump 300. During the stop, the sealed fluid does not act in the direction of leaking to the atmosphere side. Therefore, while the rotating shaft 201 is stationary, the horizontal shaft type pump device 311 is lubricated by the action of the sealing member (pressing of the lip 211d or flowing down by the labyrinth grooves 541 and 542) regardless of the roughness of the surface of the spindle 201. Can be easily sealed. Therefore, as compared with the groove of the rotating shaft described in Patent Document 5, the groove 201c of the pump device 310 has a wider allowable range of surface roughness and processing accuracy. Further, the method for processing the spindle 201 for forming the groove 201c and the allowable range of the finishing tool are expanded.

Further, in Patent Document 2, the lead angle θ, which is the angle between the sliding surface and the line direction of the groove 201c, is set in the range of 10 to 30 °, and if the lead angle θ is too large, the pumping action is too strong and the seal is formed. There is a statement that the amount of oil that is held is insufficient due to the outflow of oil between them. In the above-described embodiment and modification of the present invention, the oil seal 211 can be replenished with the lubricant along the side surface of the bearing cover 205 on the space S side by the action of the second flow FL2, so that the lead angle θ is set. If it is too large, the lubricant on the sliding surface of the oil seal 211 will not be insufficient. For example, it may be 10 ° to 80 °. Here, if the lead angle θ is set to about 45 °, the worker who finishes the spindle 201 can easily recognize the target of inclination, so that workability is improved.

The pump 300 may be operated by using variable speed means. In the pump device 311, the amount of the lubricant scattered from the bearing 202 and the amount of the lubricant returned in the groove 201c are both proportional to the rotation speed. For example, when the rotational speed of the spindle 201 is reduced to 50% of the normal speed, the amount of lubricant scattered from the bearing 202 is reduced and the second flow FL2 for supplying the lubricant to the seal member is reduced, but the groove 201c Since the pumping action is also reduced and the first flow FL1 is also reduced, it is possible to suppress the shortage of the lubricant and the leakage of the lubricant in the oil seal 211. Therefore, the pump device 311 can also be used for an automatic water supply pump or the like that performs variable speed operation. Further, even in the spindle 201 that has been worn such as the lip groove 201b, by providing the groove 201c on the atmospheric side of the surface of the spindle 201, it is possible to prevent the lubricating oil from leaking from the oil seal 211 to the atmospheric side. Further, the embodiments and modifications described for the bearing cover 205 and the oil seal 211 may be implemented in the bearing cover 206 and the oil seal 212, and the embodiments and modifications described in the pump device 301 are the pump device. It can also be applied to 101.

Each of the above-described embodiments is described for the purpose of allowing a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the invention is not limited to the described embodiments and should be the broadest scope according to the technical ideas defined by the claims.

1 Spindle 1b Lip groove 1c Groove 2,3 Bearing 4 Bearing body 5,6 Bearing cover 11,12 Oil seal 13 Drain ring 21 Body cover 23 Gland packing 30 Impeller 32 Pump body 201 Main shaft 201b Lip groove 201c Groove 202,203 Bearing 204 Bearing body 205,206 Bearing cover 211,212 Oil seal 213 Drain ring 221 Body cover 223 Gland packing 230 Impeller 232 Pump body 300 Pump

Claims (15)

A spindle that rotates an impeller that pressurizes the transport liquid by driving a drive machine in a predetermined direction, and
A bearing that rotatably supports the spindle and
The bearing cover through which the spindle penetrates and
A sealing member that prevents the lubricant of the bearing from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle.
Equipped with
The bearing cover is configured so that the lubricant scattered from the bearing flows through the bearing cover and flows to the sealing member.
The outer peripheral surface of the spindle is provided with a groove inclined so that the lubricant on the outer peripheral surface of the spindle is returned from the atmosphere side to the sealed fluid side when the spindle rotates.
The sealing member has a lip that comes into contact with the outer peripheral surface of the spindle.
A lip groove with which the lip contacts is formed on the outer peripheral surface of the spindle.
The sloping groove extends diagonally across the lip groove to reach the bearing.
When the spindle is stationary, the oil level of the lubricant is at a liquid level below the spindle.
The seal member is an oil seal incorporated in the bearing cover.
The bearing cover is a pump device configured such that the lubricant scattered from the bearing is supplied through the bearing cover between the oil seal and the sliding portion on the outer peripheral surface of the spindle. The pump device is a horizontal axis type pump device.
The pump device according to claim 1. The pump device according to claim 1, wherein the inclined groove is provided in at least a part of a region of the outer peripheral surface of the spindle that is adjacent to the region facing the seal member toward the atmosphere. The pump device according to claim 3, wherein the inclined groove extends from the atmosphere side to the sealed fluid side of the outer peripheral surface of the spindle. The pump device according to claim 1 , wherein the inclined groove is provided in at least a part on the atmosphere side in contact between the oil seal and the sliding portion of the outer peripheral surface of the main shaft. The pump device according to claim 1 , wherein the inclined groove is provided in at least a part of the outer peripheral surface of the main shaft on the sealed fluid side. The pump device according to claim 1, wherein the bearing cover has a structure on the surface on the bearing side to guide the lubricant scattered on the bearing cover to the sealing member. As a structure for guiding the lubricant to the seal member, the surface including at least the ceiling surface portion of the inner peripheral surface of the bearing cover becomes the main shaft as it approaches the seal member along the long axis direction of the main shaft. The pump device according to claim 7 , which is inclined to approach. The pump according to claim 7 , wherein the bearing cover includes a bearing cover main body and a guide member that guides the lubricant scattered from the bearing to the seal member as a structure for guiding the lubricant to the seal member. Device. The guide member is provided on the inner peripheral surface including the uppermost portion of the inner peripheral surface of the bearing cover main body, and has a protrusion shape extending to the seal member along the long axis direction of the main shaft.
The pump device according to claim 9 , wherein the surface of the guide member facing the spindle is inclined so as to approach the spindle as it approaches the seal member along the major axis direction of the spindle. A spindle that rotates an impeller that pressurizes the transport liquid by driving a drive machine in a predetermined direction, and
A bearing that rotatably supports the spindle and
The bearing cover through which the spindle penetrates and
A sealing member that prevents the lubricant of the bearing from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle.
Equipped with
The bearing cover is configured so that the lubricant scattered from the bearing flows through the bearing cover and flows to the sealing member.
The outer peripheral surface of the spindle is provided with a groove inclined so that the lubricant on the outer peripheral surface of the spindle is returned from the atmosphere side to the sealed fluid side when the spindle rotates.
The bearing cover has a structure on the surface on the bearing side to guide the lubricant scattered on the bearing cover to the sealing member.
The bearing cover has a bearing cover main body and a guide member that guides the lubricant scattered from the bearing to the seal member as a structure for guiding the lubricant to the seal member.
The guide member is provided on the inner peripheral surface of the bearing cover main body, has a protrusion shape extending to the seal member along the major axis direction of the spindle, and is parallel to the major axis direction of the spindle and said. A pump device that is arranged substantially horizontally in a vertical cross section including a guide member. A spindle that rotates an impeller that pressurizes the transport liquid by driving a drive machine in a predetermined direction, and
A bearing that rotatably supports the spindle and
The bearing cover through which the spindle penetrates and
A sealing member that prevents the lubricant of the bearing from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle.
Equipped with
The bearing cover is configured so that the lubricant scattered from the bearing flows through the bearing cover and flows to the sealing member.
The outer peripheral surface of the spindle is provided with a groove inclined so that the lubricant on the outer peripheral surface of the spindle is returned from the atmosphere side to the sealed fluid side when the spindle rotates.
The bearing cover has a structure on the surface on the bearing side to guide the lubricant scattered on the bearing cover to the sealing member.
The bearing cover has a bearing cover main body and a guide member that guides the lubricant scattered from the bearing to the seal member as a structure for guiding the lubricant to the seal member.
The guide member is provided on the inner peripheral surface of the bearing cover main body, has a protrusion shape extending to the seal member along the major axis direction of the spindle, and is parallel to the major axis direction of the spindle and said. A pump device having a vertical cross section including a guide member, which is inclined downward as it approaches the seal member along the long axis direction of the spindle. A spindle that rotates an impeller that pressurizes the transport liquid by driving a drive machine in a predetermined direction, and
A bearing that rotatably supports the spindle and
The bearing cover through which the spindle penetrates and
A sealing member that prevents the lubricant of the bearing from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle.
Equipped with
The bearing cover is configured so that the lubricant scattered from the bearing flows through the bearing cover and flows to the sealing member.
The outer peripheral surface of the spindle is provided with a groove inclined so that the lubricant on the outer peripheral surface of the spindle is returned from the atmosphere side to the sealed fluid side when the spindle rotates.
The sealing member has a lip that comes into contact with the outer peripheral surface of the spindle.
A lip groove with which the lip contacts is formed on the outer peripheral surface of the spindle.
The sloping groove extends diagonally across the lip groove.
When the spindle is stationary, the oil level of the lubricant is at a liquid level below the spindle.
The seal member is an oil seal incorporated in the bearing cover.
The bearing cover is configured such that the lubricant scattered from the bearing is supplied through the bearing cover between the oil seal and the sliding portion on the outer peripheral surface of the spindle.
The bearing cover has a structure on the surface on the bearing side to guide the lubricant scattered on the bearing cover to the sealing member.
As a structure for guiding the lubricant to the seal member, a deflector member attached to the spindle at a position between the bearing and the seal member is provided.
The deflector member is a pump device configured to blow the lubricating oil that has fallen on the spindle to the bearing cover again by centrifugal force. A spindle that rotates an impeller that pressurizes the transport liquid by driving a drive machine in a predetermined direction, and
A bearing that rotatably supports the spindle and
The bearing cover through which the spindle penetrates and
Equipped with variable speed means
The drive is driven so that constant pressure control or estimated end pressure control is performed by the variable speed means.
The bearing cover is configured so that the lubricant scattered from the bearing flows through the bearing cover to the seal member.
The outer peripheral surface of the main shaft is provided with a groove inclined so that the lubricant on the outer peripheral surface of the main shaft is returned from the atmosphere side to the sealed fluid side when the main shaft rotates.
The sealing member has a lip that comes into contact with the outer peripheral surface of the spindle.
A lip groove with which the lip contacts is formed on the outer peripheral surface of the spindle.
The sloping groove extends diagonally across the lip groove.
When the spindle is stationary, the oil level of the lubricant is at a liquid level below the spindle.
The seal member is an oil seal incorporated in the bearing cover.
The bearing cover is a pump device configured such that the lubricant scattered from the bearing is supplied through the bearing cover between the oil seal and the sliding portion on the outer peripheral surface of the spindle. A spindle for rotating an impeller that pressurizes the transport liquid by driving a drive machine in a predetermined direction, a bearing that rotatably supports the spindle, a bearing cover through which the spindle penetrates, and lubrication of the bearing. A sealing member for preventing the agent from leaking from the sealed fluid side to the atmosphere side along the outer peripheral surface of the spindle is provided, and the bearing cover is provided with the lubricant scattered from the bearing on the bearing cover. It is a maintenance method of a pump device configured to flow through the seal member.
A step of separating the lip of the sealing member that slides from the lip groove formed on the outer peripheral surface of the main shaft from the lip groove .
When the spindle rotates, the lubricant exposed on the outer peripheral surface of the spindle on the atmospheric side reaches the bearing by diagonally crossing the lip groove so as to be pushed back to the sealed fluid side. And the process of forming on the outer peripheral surface of the spindle so as to
The process of attaching the seal member to the spindle and
How to maintain a pumping device with.

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