JPH0694035A - Bearing device for vertical drainage pump - Google Patents

Abstract

PURPOSE:To lubricate a bearing device by its own liquid, by stirring lubricating water in a water storage tank with the water storage tank, in which the upper part is opened, fixed to a pump casing so as to surround the inner peripheral side of an annular collar and the lower end and outer peripheral side of a bearing casing, at the outer peripheral side of a rotation shaft in a bearing device for draining rain water, and so on. CONSTITUTION:A water storage tank 12, in which the upper part is opened, is constituted so as to surround the inner peripheral side of an annular collar 6 fixedly provided on a rotation shaft 3 and the lower end surface and outer peripheral side of a bearing casing 10, at the outer peripheral side of a rotation shaft 3. The water storage tank 12 is fixed to a pump casing 2 together with the bearing casing 10. Also in this water storage tank, plural radial grooves 11 are formed on the contact surface between the water storage tank 12 and the bearing casing 10, lubricating water is stored, and water is made always full by automatic water-supplying in running a pump. the lubricating water is stirred by the synergetic effect between rotation flow and radious direction circulation flow following running, and concurrently a foreign object is discharged at the time of pumping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device used for a rainwater drainage pump or the like, and more particularly to a lubricating structure for a bearing which is required during a preceding standby operation.

[0002]

2. Description of the Related Art Ceramic bearings are widely used as bearings for vertical axis pumps because they have excellent wear resistance and can use pumped water as lubricating water.

On the other hand, due to the rapid urbanization in recent years, the inflow of rainwater into the drainage pump station is becoming large and rapid, and in order to cope with such a situation, there is an increasing demand for the pump to be operated in advance standby. . However,
A vertical shaft pump that performs an aerial operation represented by such a preceding standby operation is operated for a long time in a state where water is not pumped even though the pump is started and the main shaft is rotating. During this period, the lubricating water was not injected into the bearings, and abnormal wear due to dry sliding could not be avoided and the ceramic bearings could not be adopted.

As a means for solving such a problem, a method of pouring lubricating water (fresh water) from the outside of the pump to the bearing is taken as shown in Japanese Patent Laid-Open No. 2-115592. In this method, whether or not the bearing is flooded is detected by a full water detector, and if it is not flooded, lubricating water is injected, and if it is detected that it is flooded, water injection is stopped. On the other hand, in the air operation for a short time, an oil-impregnated ceramic bearing is employed, as disclosed in JP-A-59-155621, in which the sliding surface is lubricated with a small amount of oil oozing out due to thermal expansion. Also,
JP-A-55-90718 discloses a method in which fresh water is supplied from the outside of the pump and stored in the inner peripheral side of the protection tube to operate in the air.

In addition to such a method of supplying fresh water from the outside of the pump to lubricate the bearing, a water tank is provided on the rotating shaft,
A method of lubricating the bearing itself by immersing it in lubricating water (clean water) is disclosed in Japanese Utility Model Publication No. 4-36120.

[0006]

[Patent Document 1] Japanese Unexamined Patent Application Publication No.
In the lubrication structure for a ceramic bearing as disclosed in Japanese Patent No. 115592, water is externally poured into the bearing during air operation, and therefore a large amount of lubrication water is required when operating for a long time. Further, since it has a water supply piping system, maintenance of the piping is required, which is troublesome. On the other hand, oil-impregnated ceramic bearings do not have sufficient oil and are not sufficiently lubricated, and it is impossible to operate the bearings for a long time because the bearing temperature becomes high. Also, since a small amount of oil that has exuded does not return to the bearing, there is a possibility that repeated air operation may not be possible due to oil shortage. On the other hand, in the method of supplying fresh water from the outside of the pump and forming a water reservoir on the inner peripheral side of the protection tube to lubricate it, maintenance of the piping is required because it has a water supply piping system as in JP-A-2-115592. It takes time and effort.

In the method of lubricating the bearing itself by immersing it in lubricating water, foreign matter such as sediment particles and lubricating water rotate at the same time, so that the sediment particles are collected and accumulated on the outer peripheral portion of the water tank due to the difference in specific gravity. Can be considered. Therefore, it is necessary to remove the accumulated sediment particles for long-term use, and maintenance is expected to take time.

That is, in the lubrication structure for such a bearing, the purpose is sufficiently to provide a bearing device which is stable for a long period of time by utilizing the pumping liquid without injecting lubricating water from the outside of the pump and which is maintenance-free. It could not be achieved. An object of the present invention is to provide a ceramic bearing device as a lubricating structure for a bearing, which uses self-liquid as lubricating water without injecting the lubricating water from the outside of the pump and automatically discharges foreign matter contained in the lubricating water. To do.

[0009]

In order to achieve the above object, in the present invention, self-liquid is used as lubricating water without pouring lubricating water from the outside of the pump, and the ceramic bearing is always immersed in the lubricating water. A water tank for storing lubricating water, which is arranged so as to surround the ceramic bearing so as to slide in the
It is composed of means for stirring the lubricating water.

That is, a water tank having an upper opening on the outer peripheral side of the rotary shaft and on the inner peripheral side of the annular collar, the lower end surface of the bearing casing and the outer peripheral side is fixed to the pump case. Lubricating water (self-liquid) is stored in the ceramic bearings so that the ceramic bearing is always immersed in the lubricating water. It is characterized by being replaced.

[0011]

As described above, in the ceramic bearing device of the present invention, the ceramic bearing is immersed in the pumping liquid previously stored in the water storage tank even if the lubricating water is not injected from the outside of the pump. Therefore, stable sliding characteristics can be obtained. Further, by rotating the disk-shaped member fixed to the lower surface of the annular collar, the lubricating water is agitated, and the foreign matter is uniformly mixed in the lubricating water,
When pumping water, foreign matter is also discharged when it is replaced with new lubricating water, so that foreign matter does not accumulate in the water tank. As a result, the water level of the lubricating water does not fluctuate and the water level on the bearing sliding surface is stable and reliably lubricated, so that a highly reliable maintenance-free ceramic bearing device can be obtained. Lubricating water is automatically supplied during pumping (pumping liquid). The lubricating water that has been stored once has been stored for a long time because the humidity inside the pump is high and it hardly evaporates. Therefore, it is not necessary to inject lubricating water from the outside of the pump. Further, since the water supply piping system is unnecessary, maintenance of the piping is eliminated and labor can be saved. Furthermore, the trouble of the water supply piping system is eliminated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Here, the case of using ceramics for the bearing will be described in detail, but the material of the bearing is not particularly limited. FIG. 1 shows a schematic structure of a pump using a ceramic bearing device 1 according to the present invention. The pump comprises a pump casing 2, a ceramic bearing device 1 attached to the pump casing 2, and vanes 4 fixed to a rotating shaft 3. The blade 4 is supported by the ceramic bearing device 1 as an overhang. A vertical shaft pump that performs an air operation, which is represented by a preceding standby operation, is operated for a long time in a state where water is not pumped even though the pump is started and the main shaft is rotating. During this time, the bearing will not be filled with lubricating water, and if it is left as it is, abnormal wear due to dry sliding cannot be avoided and it is necessary to lubricate the ceramic bearing by a highly reliable and simple method. The ceramic bearing device 1 of the present invention takes these matters into consideration, and the ceramic bearing device 1 shown in FIG.
An example will be shown. The arrow in the figure indicates the circulating direction of the lubricating water 17 during rotation. The ceramic bearing device 1 has an annular collar 6 fixed to the rotating shaft 3, a sleeve 5 fixed to the annular collar 6, made of cemented carbide or coated with cemented carbide, and a sleeve 5 slidably supporting the sleeve 5. A ceramic bearing 7, a bearing case 8 in which the ceramic bearing 7 is mounted, and a bearing casing 10 in which the bearing case 8 is elastically coupled with an elastic material 9 such as rubber are provided on the outer peripheral side of the rotating shaft 3 and A water storage tank 12 having an upper opening is formed so as to surround the inner peripheral side of the annular collar 6, the lower end surface of the bearing casing 10, and the outer peripheral side. In this case, the water storage tank 12 is fixed to the pump casing 2 together with the bearing casing 10, and a plurality of radial grooves 11 are provided on the contact surface between the water storage tank 12 and the bearing casing 10. Lubrication water is poured into the water tank 12 after the assembly is completed in advance. After that, when the pump was operated, it was automatically filled with water and always filled. Therefore, since the ceramic bearing 7 can always slide while being immersed in the lubricating water 17, stable sliding characteristics can be obtained for a long period of time even in the air operation in which the pumping liquid does not come. With this configuration, it is not necessary to supply lubricating water from the outside of the pump. Further, since the water supply pipe is not required, maintenance work can be omitted. Further, in this embodiment, means for positively stirring the lubricating water is constructed by the synergistic effect of the rotating flow and the circulating flow in the radial direction, so that foreign matter is simultaneously discharged at the time of replacement with new lubricating water during pumping. I chose As a result, there is no fluctuation in the water level of the lubricating water, and the water level on the bearing sliding surface is stable and reliably lubricated, so that a highly reliable ceramic bearing device can be obtained. Further, a means 16 for detecting the water level is installed to confirm the presence or absence of lubricating water in the water tank. The reliability is further improved by installing the means 16 for detecting the water level. A disk member 15 attached to the lower surface of the annular collar 6 for rotating the stirring means, and a baffle plate 14 that does not rotate in opposition thereto are provided. The baffle plate 14 is provided on a plurality of ribs 13 provided on the lower surface of the bearing casing. It is fixed and is composed of openings 23a and 23b between the bearing casing 10 and the baffle plate 14 through which lubricating water circulates. Next, the operation of the stirring means will be described. Baffle plate 1 of the present invention
When No. 4 is installed, the lubricating water in contact with the upper surface and the lower surface of the disk member 15 is given a rotational force due to the viscosity, and the water between the water tank 12 and the baffle plate 14 is drawn to the outer peripheral side. At the same time, the replenishment of the water drawn toward the outer peripheral side by the centrifugal force is continuously performed through the opening 23b provided on the inner diameter side. Stir without precipitation. During pumping, lubricating water flows in from the clearance 23c on the inner peripheral side of the water storage tank in the direction of the arrow in the drawing and flows out from the radial groove 11, so that foreign matter is discharged together with the lubricating water and replaced with new lubricating water. Therefore, foreign matter does not accumulate in the water tank, so that the amount of lubricating water is stable and the water level is constant. Also,
Since the lubricating water is constantly agitated while the pump is rotating, particles of foreign matter collide with each other and become finely crushed in a short time into a muddy state. As a result, there is almost no damage from foreign matter.

Further, since the lubricating water is constantly circulated on the fixed side of the water tank and by the baffle plate, the water level is stable without scattering to the outer peripheral side and the sliding surface is rotated at a high speed. Is surely lubricated.

In this way, it is possible to obtain a highly reliable external non-water-supplying ceramic bearing device which can use the pumped water as lubricating water.

As described above, according to the present invention, as compared with the conventional method in which fresh water is used as lubricating water, the pumped-up liquid can be used as it is, so that fresh water is not required and the water can be largely saved. Further, since water supply equipment is not required, troubles such as sequences are solved and reliability on the pump is improved. Next, another embodiment will be described.

Although the embodiment shown in FIG. 3 is structurally almost the same as that of FIG. 2, in this embodiment, a plurality of radial grooves 11a are provided on the lower surface of the disk member 15a, and the water tank is provided on the opposite surface. Bottom plate
A circular plate 14a fixed to a plurality of supports 13a is arranged on 22a, and further, a bottom plate 22a of the water tank to which the supports 13a are fixed is inclined. Further, openings 23d and 23e are provided between the disc 14a and the bottom plate 22a of the water tank. In such a configuration, when the pump rotates, the radial groove 11a
The lubricating water in the gap between the disk 14a and the disk 14a flows radially due to centrifugal force. At the same time, the replenishment of the water drawn toward the outer peripheral side by the centrifugal force is continuously carried out through the opening 23e provided on the inner diameter side, so that the water above and below the disk 14a constantly circulates, so that the foreign matters Stir without precipitation.
Further, since the bottom plate 22a of the water storage tank is inclined, foreign matter gathers on the inner peripheral side, so that the foreign matter is agitated more than the non-inclined one. Here, the cross-sectional shape of the disk 14a is fan-shaped, but a rectangular shape has the same effect.

Although the embodiment shown in FIG. 4 is structurally almost the same as that of FIG. 2, a plurality of radiation grooves 17 are provided on the lower surface of the disk member 15 in this embodiment. With this configuration,
Since the lubricating water in the radial groove 11a flows in the radial direction during rotation, a circulating flow is generated on the lower surface of the disk member 15, and the foreign matter is surely agitated. Also, because of the pumping action, pumping water can be replaced smoothly.

Although the embodiment shown in FIG. 5 is structurally almost the same as that of FIG. 2, a brush 18 is provided on the lower surface of the disk member 15 in this embodiment. According to this structure, since the brush 18 directly sweeps the bottom of the water tank, the foreign matters are mixed with the lubricating water without settling, and only the foreign matters are scattered to the outer peripheral side by the centrifugal force. Further, a fin-shaped one having a diaper instead of a brush also has the same effect.

The embodiment shown in FIG. 6 is structurally almost the same as that of FIG. 2, but in this embodiment, the stirring means has a ring shape in which a plurality of discharge holes 24 are provided on the surface facing the bottom plate of the water tank. The pipe 19 and the pipe 25 connecting this pipe and the pump casing near the upper part of the blade are formed. Since the high-pressure pumped-up liquid is ejected from the discharge hole 24 of the ring-shaped pipe 19 through the pipe 25, the foreign matter on the bottom plate of the water tank is rolled up and agitated by the lower surface of the annular collar. Even with such a configuration, the same operational effect can be obtained.

The embodiment shown in FIG. 7 is structurally almost the same as that of FIG. 2, but in this embodiment, the permanent magnet 20 having the stirring means embedded in the upper surface of the blade and the bottom plate 2 of the water tank facing the permanent magnet 20.
1 is a non-magnetic material, and a movable magnetic material 20a with a cover 22 is arranged on the bottom plate of the water tank. In such a structure, when the blade rotates, the magnetic force of the permanent magnet 22 causes the magnetic body 20a with the cover 22 placed in the water tank.
Also rotates at the same time. Therefore, foreign matter such as sediment particles accumulated on the bottom plate in the water tank is stirred by the movement of the magnetic body 20a. Even with such a configuration, the same operational effect can be obtained.

In the above embodiments, the case where ceramics is applied to the bearing has been described, but the same effect can be obtained even if the bearing is made of a member having a high hardness material such as cemented carbide or a sliding surface coated with a high hardness material. Play.

[0022]

EFFECTS OF THE INVENTION Lubricating water (pumping liquid) is automatically supplied to a water storage tank during pumping. The lubricating water that has been stored once has been stored for a long time because the humidity inside the pump is high and it hardly evaporates. Therefore, there is no need to inject lubricating water from the outside for a long period of time. In addition, since the pumped liquid itself can be used as the lubricating water, no fresh water is needed and a great deal of water can be saved. Secondly, since the foreign matter contained in the lubricating water is agitated, the particles collide with each other and are finely crushed in a short time to form a mud. As a result, the damage to the water storage tank due to foreign matter is reduced as compared with the conventional example. Thirdly, in the system with a water tank on the rotating side, when the number of rotations increases, the centrifugal force will cause the lubricating water to scatter to the outer peripheral side and the water level on the sliding surface will drop, so it is expected that stable bearing performance cannot be obtained. It On the other hand, in this embodiment, since the water tank is stationary and the baffle plate constantly circulates the lubricating water, the water level is stable and the sliding surface is stable because the water level is stable. To be lubricated. Therefore, stable bearing performance can be obtained even at high speed rotation. Fourth, since no water supply piping system is required, maintenance of piping is eliminated and labor can be saved. Furthermore, the reliability of the entire equipment is improved because accidents due to troubles in the water supply piping system are eliminated. Therefore, stable bearing performance can be exhibited for a long time even in the air operation in which the pumped-up liquid does not come.

According to the present invention, as compared with the conventional lubrication structure, the ceramic bearing can be always immersed in the pumping liquid stored in advance in the water storage tank without injecting the lubricating water from the outside. As a result, stable sliding characteristics can be obtained. Further, foreign matter such as sediment particles is agitated by the means for agitating the lubricating water without settling, and is replaced with fresh lubricating water at the time of pumping, so that only the foreign matter does not accumulate. As a result, the water level of the lubricating water can be kept constant, and there can be provided a highly reliable ceramic bearing device that is reliably lubricated without fluctuations in the water level on the bearing sliding surface.

[Brief description of drawings]

FIG. 1 is a sectional view of a ceramic bearing device of the present invention and a pump using the bearing device.

FIG. 2 is a sectional view of another ceramic bearing device of the present invention.

FIG. 3 is a sectional view of another ceramic bearing device of the present invention.

FIG. 4 is a sectional view of another ceramic bearing device of the present invention.

FIG. 5 is a sectional view of another ceramic bearing device of the present invention.

FIG. 6 is a sectional view of another ceramic bearing device of the present invention.

FIG. 7 is a sectional view of another ceramic bearing device of the present invention.

[Explanation of symbols]

1 ... Ceramic bearing device, 2 ... Pump casing, 3 ...
Rotation axis, 4 ... Blade, 5 ... Sleeve, 6 ... Annular collar,
7 ... Ceramic bearing, 8 ... Bearing case, 9 ... Elastic material,
10 ... Bearing casing, 11, 11a ... Radiation groove, 12 ...
Water tank, 13 ... Rib, 14 ... Baffle plate, 15 ...
Disc member, 16 ... Means for detecting water level, 17 ... Lubricating water,
23a, 23b, 23c ... Openings.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F16C 33/24 A 6814-3J

Claims (7)

[Claims] 1. A ring-shaped collar fixed to a rotary shaft, a bearing for slidingly supporting the ring-shaped collar, a bearing case in which the bearing is mounted, and a bearing casing supporting the bearing case. In the bearing device including the fixing device, a water tank having an upper opening that surrounds the inner peripheral side of the annular collar, the lower end surface of the bearing casing, and the outer peripheral side of the rotary shaft is fixed to the pump casing. A bearing device comprising means for stirring the lubricating water in the water tank. 2. An annular collar fixed to a rotating shaft, a sleeve made of cemented carbide or a sleeve coated with the cemented alloy, which is fixed to the outer peripheral side of the annular collar, and the sleeve is slidably supported. In a ceramic bearing device comprising a ceramic bearing, a bearing case in which the ceramic bearing is mounted, and a bearing casing elastically supporting the bearing case, in the outer peripheral side of the rotary shaft, inside the annular collar. A bearing device, characterized in that a water tank having an upper opening so as to surround the peripheral side, the lower end surface of the bearing casing and the outer peripheral side is fixed to the pump casing, and means for stirring the lubricating water in the water tank is provided. 3. The disk member according to claim 1, wherein the stirring means rotates, and a disk member attached to the lower surface of the annular collar and a baffle plate that does not rotate in opposition thereto are provided, and the baffle plate is the bearing. A bearing device which is fixed by a plurality of ribs provided on the lower surface of the casing, and which includes an opening for circulating lubricating water between the bearing casing and the baffle plate. 4. The disk member according to claim 1 or 2, wherein a disk member attached to the lower surface of an annular collar on which the agitating means rotates, and a plurality of radial grooves provided on the lower surface of the disk member, and water is stored on the opposing surface. A bearing in which a disk fixed by a plurality of supports is arranged on the tank bottom plate, the bottom plate of the water tank fixing the support is inclined, and an opening is provided between the disk and the bottom plate of the water tank. apparatus. 5. The ring-shaped pipe according to claim 1 or 2, wherein the stirring means has a plurality of discharge holes on the surface facing the water tank bottom plate, and a pipe connecting the pipe and the pump casing near the upper part of the blade. Bearing device composed of and. 6. The permanent magnet according to claim 1 or 2, wherein the stirring means is a permanent magnet embedded in the upper surface of the blade, and a bottom plate of the water tank facing the permanent magnet is made of a non-magnetic material, and is movable on the water tank bottom plate. A bearing device in which a magnetic body is arranged and the magnetic water is used to stir the lubricating water in the water storage tank. 7. A bearing device according to claim 1, further comprising means for confirming the presence or absence of lubricating water.