JPH0783231A - Plain bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a split type plain bearing which has high sliding characteristics and can be easily mounted on and disassembled from equipment. [Structure] A sliding member interposed between a rotating shaft side and a fixed side is a combination of members formed of a cermet material and a ceramic material, and is mounted on a plurality of sleeve segments mounted on the outer circumference of the rotating shaft and on the fixed side. A plurality of bush segments slidingly connected to the peripheral surface of the sleeve segment are provided, and each of the sleeve segment and the bush segment can be connected to the rotating shaft and the fixed side by a plurality of fixing members. By making all of them into a split type, it becomes possible to mount and disassemble the bearing element to and from the rotating shaft and the fixed side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide bearing, and more particularly to a slide bearing suitable for a rotating main shaft of a submersible pump that pumps and conveys a large amount of fluid such as slurry.

[0002]

2. Description of the Related Art As a bearing structure of a rotating main shaft of a submersible pump used for pumping slurry or other various fluids, for example, Japanese Patent Publication No. 63-67048 and Japanese Patent Laid-Open No. 5-87.
There is one described in Japanese Patent No. 145.

These have a structure in which a rotary shaft having a vertical posture is supported by a slide bearing, and either one of a rotary side sliding member and a fixed side sliding member around the rotary shaft is made of cemented carbide or The cermet is made of a material, and the other member is made of ceramics containing silicon nitride and silicon carbide as main components.

A sliding bearing using such a material can obtain stable sliding characteristics even under a non-lubricated condition when used in a gas, and similarly have excellent lubricating characteristics even in a water lubricated state. Because it is maintained, it is optimal for vertical axis submersible pumps.

[0005]

However, although it is preferable in that it has good sliding characteristics both in terms of non-lubrication and water lubrication, in any of the publications, the slide bearing is wholly integrated as a whole. Since it is assembled, there are major obstacles in terms of incorporation into the pump.

For example, when the rotary shaft of a submersible pump is very long, since the slide bearing is an annular body, the slide bearing is externally inserted from the end of the rotary shaft for work such as mounting and disassembly / removal. It will be. For this reason, it takes time and labor to replace the slide bearing and perform maintenance and inspection, and depending on the positional relationship with the pump casing and other members, it is necessary to disassemble these members.

As described above, conventional sliding bearings for submersible pumps and the like can maintain high sliding characteristics by applying suitable materials, but have a drawback in terms of assembly and disassembly work.

An object to be solved in the present invention is to provide a split type sliding bearing which has a high sliding property and can be easily mounted on a device or disassembled.

[0009]

SUMMARY OF THE INVENTION The present invention is a slide bearing in which a sliding member interposed between a rotating shaft side and a fixed side is a combination of members formed of a cermet material and a ceramic material, A plurality of sleeve segments mounted on the outer circumference of the rotating shaft and a plurality of bush segments mounted on the fixed side and slidingly connected to the peripheral surface of the sleeve segment are provided, and each of the sleeve segments and the bush segments is plural. The fixing member is connected to the rotary shaft and the fixed side.

The end faces of the sleeve segment and the bush segment in the circumferential direction are inclined faces of the profile twisted at a constant angle with respect to the axis, and the intersecting angle of the inclined faces of the sleeve segment and the bush is at least 1 ° or more. It can be configured.

Further, a sleeve guide is provided between the sleeve segment and the rotary shaft, and a bush guide is provided between the bush segment and the fixed side so that the combination of each segment and the guide can be attached to and removed from the rotary shaft and the fixed side respectively. It may be connected.

[0012]

Since the sliding member of the slide bearing is composed of a plurality of disassemblable sleeve segments and bush segments, the work of removing the fixing member from the end of the rotating shaft by attaching and detaching the fixing member to and from the rotating shaft side It becomes unnecessary and the bearing element can be easily attached and detached.

Since the boundary portion between the end faces in the circumferential direction of the sleeve segment and the bush segment has a crossing angle of 1 ° or more, when the sleeve segment rotates, the boundary portions are point-polymerized with each other and are divided. This allows sliding without being affected by surface discontinuity.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical cross-sectional view of a water pump having a sliding bearing according to the present invention.

In the figure, a rotary shaft 1 is coaxially incorporated into a pumping pipe 50 whose lower end is immersed in water, and the upper end of the rotary shaft 1 is connected to a drive source such as an electric motor (not shown). It is driven to rotate, and the impeller 51 at its lower end enables pumping.

The rotary shaft 1 is supported by the slide bearing 2 at the lower end and substantially the center of the pumping pipe 50, and is held at the center by a stay 52 coaxially fixed inside the pumping pipe 50. The stay 52 has a shape in which a plurality of rods are radially extended and the slide bearing 2 can be held in the pumping pipe 50, and has a shape that does not block the internal flow path of the pumping pipe 50.

FIG. 2 is a vertical cross-sectional view showing a main part of the slide bearing 2 held by the stay 52, FIG. 3 is an external view when a sleeve segment is mounted around a rotation axis, and FIG. 4 is an inside of the stay 52. FIG. 8 is a vertical cross-sectional view showing a main part when a bush is incorporated in the.

The plain bearing 2 is provided with a plurality of sleeve segments 3 fixed around the rotary shaft 1 and a plurality of partial bush segments 4 incorporated in the stay 52 as main elements. In this example, each sleeve segment 3 is made of cermet, and the bush segment 4 is made of ceramics.

There are a total of four sleeve segments 3, and by arranging these around the rotary shaft 1,
As shown in FIG. 3, the whole is assembled into a cylindrical shape. These sleeve segments 3 are common parts having the same shape, and as shown in FIG. 2, connecting seats 3a and 3b are formed at the upper end and the lower end, respectively, having a reduced radial thickness. Both ends of each sleeve segment 3 in the circumferential direction have a profile of a twisted end surface that is not parallel to the axis of the rotary shaft 1 as shown in FIG.

An engagement structure, such as a key and a key groove, is provided between the inner peripheral surface of each sleeve segment 3 and the outer peripheral surface of the rotary shaft 1 so that the sleeve segment 3 extends in the circumferential direction of the rotary shaft 1. Make sure the position does not shift.

In order to mount the sleeve segment 3 around the rotary shaft 1, a plurality of retainers 5 and a holder 6 for restraining these retainers 5 on the circumferential surface side of the rotary shaft 1 are provided. In this example, the retainer 5 and the holder 6 are the rotary shaft 1
By arranging four of these around each other, an annular body that is coaxially arranged with the rotating shaft 1 and that can restrain one end side of the sleeve segment 3 in the axial direction is configured.

The retainer 5 is also a common component, and as shown in FIG. 2, the connecting seats 3a, 3a of the sleeve segment 3,
The holding seat 5a that abuts 3b is provided on the inner peripheral side, and
The outer peripheral surface is formed with a restraining seat 5b which receives a restraining force from the outside by the holder 6.

Similarly, the holder 6 is also a common part, and the restraining seat 5b of the retainer 5 is formed with an overlapping seat 6a overlapping from the outside. Then, these holders 6 are provided with a fixing bolt 6b for fixing themselves to the rotary shaft 1 and a restraining bolt 6c for determining the position of the retainer 5 in the axial direction.

On the other hand, like the sleeve segment 3, a total of four bush segments 4 are incorporated on the stay 52 side. These bush segments 4 are common parts having the same shape. As shown in FIG. 4, connecting seats 4a and 4b each having a reduced radial thickness are formed at the upper end and the lower end, and the inner peripheral surface in the vicinity thereof is formed. Is provided with tapered surfaces 4c and 4d having a large opening degree on the outer side. Both ends of each bush segment 4 in the circumferential direction have a profile of a twisted end surface, which is not parallel to the axis of the rotary shaft 1 like the sleeve segment 3.

It should be noted that between the outer peripheral surface of each bush segment 4 and the inner peripheral surface of the stay 52, as in the relationship between the sleeve segment 3 and the rotary shaft 1, there is an engaging structure such as a key and a key groove. The bush segment 3 is prevented from being displaced in the circumferential direction.

The upper and lower ends of the bush segment 4 are fixed to the stay 52 by a plurality of holders 7. Similar to the bush segment 4, these holders 7 can also be configured as an annular body by combining a total of four members, and the connecting seats 4a, 4 of the bush segment 4 can be formed.
It has a restraint seat 7a that can be joined to b. Then, the flange 7b is attached to a portion that abuts the upper surface or the lower surface of the stay 52.
Is formed, and the stay 52 can be mounted by a fixing bolt 7c penetrating therethrough.

FIG. 5 is a view showing the inclination of the twist of the end faces of the sleeve segment 3 and the bush segment 4 with respect to the rotation axis 1, and is a development view of these segments 3 and 4 as seen from the outside.

The sleeve segment 3 has a shape in which the end face in the circumferential direction is obliquely upward to the right, and the bush segment 4 is, on the contrary, obliquely upward to the left. Due to such an inclination, when the segments 3 and 4 are overlapped with each other, a crossing angle θ is formed between the respective end faces. This intersection angle θ is at least 1 ° or more, preferably 1
It is 0 ° or more.

When the rotary shaft 1 rotates, the sleeve segment 3 moves in the direction of the arrow in the figure. In this case, the end faces of the segments 3 and 4 maintain a relationship having a constant crossing angle θ, so that the end faces are in point contact (point A shown in the figure).

As described above, since the segments 3 and 4 are in point contact with each other in the areas where the respective surfaces are discontinuous and the surfaces are discontinuous, the end surfaces are chamfered to engage with each other after they once contact. The contact is continued smoothly without causing. Therefore, even with a member in which the sleeve segment 3 and the bush segment 4 forming the sliding surfaces of the sliding bearing 2 with each other are divided, the same operation as that of the sliding surface of the integral body is possible.

In the above structure, the sleeve segment 3 is attached to the rotary shaft 1 from the work of previously setting the retainer 5 and the holder 6 on the side receiving the lower end of the sleeve segment 3 in the rotary shaft 1 in FIG. Each retainer 5
Is constrained to the peripheral surface side of the rotary shaft 1 through a holder 6 fixed around the rotary shaft 1 by a fixing bolt 6b,
The level is set by the restraint bolt 6c.

Then, each sleeve segment 3 is placed on the retainer 5 in the posture shown in FIG. 3, and the both ends in the circumferential direction are tightly fitted to each other to make the whole cylindrical and the rotary shaft 1
Array around. Then, the upper ends of the respective sleeve segments 3 are covered with the retainers 5 arranged on the upper side, and these retainers 5 are fixed by restraining the holder 6 to the rotating shaft 1 side by the fixing bolts 6b.

As described above, the sleeve segments 3 are annularly arranged around the rotary shaft 1. At this time, as described above, each sleeve segment 3 is held without shifting in the circumferential direction of the rotary shaft 1 by the engagement using the sleeve segment 3 and the key around the rotary shaft 1 and the key groove.

On the other hand, when assembling the bush segment 4 into the stay 52, the lower holder 7 is similarly fixed by the fixing bolt 7c, and the connecting seat 4b of each bush segment 4 falls into the restraining seat 7a of the holder 7. To set. At this time, each bush segment 4
As shown in FIG. 4, both end faces in the circumferential direction are aligned so that they are aligned, and these are fixed to the stay 52 by the holder 7 arranged above.

As described above, the divided members of the slide bearings on the rotary shaft 1 side and the stay 52 side are replaced by the rotary shaft 1
By incorporating them into the side and the stay 52 side, respectively, it is possible to obtain a connecting structure by means of a slide bearing. Then, by disassembling each member in order, it is not necessary to remove the rotary shaft 1 from the pumping pipe 50, for example.

Further, as described with reference to FIG. 5, since the crossing angle θ is provided between the end surfaces of the sleeve segment 3 and the bush segment 4, the end surfaces of the segments 3 and 4 are rotated when the rotary shaft 1 rotates. Smooth sliding between them is possible, and occurrence of defective rotation is prevented.

FIGS. 6 to 8 show another embodiment, FIG. 5 is a longitudinal sectional view of a main part, FIG. 6 is an external view when a sleeve segment is mounted around a rotation axis, and FIG. 7 is a stay 52. It is a longitudinal cross-sectional view showing a main part when a bush is incorporated inside. The same members as those in the previous example are designated by common reference numerals, and detailed description thereof will be omitted.

In this example, a sleeve guide 8 is provided between the rotary shaft 1 and the sleeve segment 3, and a bush guide 9 is incorporated between the stay 52 and the bush segment 4. These sleeve guide 8 and bush guide 9
Are shaped to correspond to four sleeve segments 3 and four bush segments 4, respectively.

The sleeve guide 8 is fixed together with the sleeve 3 to the rotary shaft 1 by four holders 10 arranged above and below, respectively. These holders 10 are fixed bolts 10a for fixing to the rotary shaft 1 as in the previous example.
And a restraining bolt 10b for determining the position of the sleeve segment 3 in the axial direction.

Similarly, the bush guide 9 is fixed to the stay 52 together with the bush segment 4 by a plurality of holders 11 at the upper and lower sides thereof. These holders 11 are connected to the stays 52 by fixing bolts 11a, and the holders 11 themselves are provided with restraining bolts 11b for regulating the position of the bush segment 4 in the axial direction.

The twisting of the end faces of the sleeve segment 3 and the bush segment 4 with respect to the rotary shaft 1 is the same as in the previous example, and as shown in FIGS. 7 and 8, the respective end faces have a crossing angle.

As described above, even when the sleeve segment 3 and the bush segment 4 are connected to the rotary shaft 1 and the stay 52 side by the respective guides 8 and 9, the sliding between the sleeve segment 3 and the bush segment 4 is utilized. Sliding is possible.

Here, the elastic body 12 made of a material such as rubber having an appropriate elasticity can be incorporated between the fixed-side bush segment 4 and the stay 52. This elastic body 12
It can be incorporated as being attached to the surface of either the bush segment 4 or the stay 52. Further, an appropriate elastic body 13 is also incorporated between the stay 52 fastened by the fixing bolt 11a and the holder 11.

If the elastic segments 12 and 13 are provided, the bush segment 4 is elastically supported on the stay 52 side, so that vibrations and the like when the rotating shaft 1 is rotating are absorbed, and It is possible to prevent damage.

[0045]

According to the present invention, the sliding members of the slide bearing and the fixing members for mounting these on the rotary shaft and the fixed side are divided, so that the work load of transportation and assembling around the rotary shaft is reduced. Therefore, it is not necessary to remove the rotary shaft from the shaft end even at the time of disassembly, maintenance and inspection, and the work can be easily performed even with a long rotary shaft.

Even if the sleeve segment and the bush segment are assembled by dividing them, if the boundaries between the respective segments are in point contact with each other, they will slide, so Smooth rotation due to good sliding can be obtained as in the case of an integrated body.

Further, by connecting the sleeve segment and the bush segment to the rotary shaft and the fixed side by their respective guides, it becomes possible to reinforce the strength of each segment and to provide an elastic support structure, and smooth operation by absorbing vibration of the rotary shaft and the like. Is possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pumping pump provided with a sliding bearing of the present invention.

FIG. 2 is a vertical cross-sectional view showing a main part of a slide bearing provided around the rotary shaft of FIG.

FIG. 3 is an external view of a sleeve segment mounted around a rotation axis.

FIG. 4 is a vertical cross-sectional view when a bush segment is attached to a stay.

FIG. 5 is a development view of the sleeve segment and the bush segment when viewed from the outside, and is a diagram illustrating a crossing angle formed by end faces in the circumferential direction of the sleeve segment and the bush segment.

FIG. 6 is a vertical cross-sectional view of a main part showing another embodiment.

7 is an external view when a sleeve segment is attached to the rotary shaft in the example of FIG.

8 is a vertical cross-sectional view when a bush segment is attached to the stay in the example of FIG.

[Explanation of symbols]

 1 Rotating Shaft 2 Sliding Bearing 3 Sleeve Segment 4 Bushing Segment 5 Retainer 6 Holder 7 Holder 8 Sleeve Guide 9 Bush Guide 10 Holder 11 Holder 12 Elastic Body 13 Elastic Body 52 Stay

Claims (3)

[Claims] 1. A slide bearing comprising a combination of a member formed of a cermet material and a ceramic material as a sliding member interposed between a rotary shaft side and a fixed side, and a plurality of slide bearings mounted on the outer circumference of the rotary shaft. Of the sleeve segment and a plurality of bush segments mounted on the fixed side and slidingly connected between the sleeve segment and the peripheral surface of the sleeve segment. Each of the sleeve segment and the bush segment is fixed to the rotary shaft by a plurality of fixing members. Sliding bearing connected to the fixed side. 2. An end surface of each of the sleeve segment and the bush segment in the circumferential direction is an inclined surface of a profile twisted at a constant angle with respect to an axis, and an intersecting angle of each of the inclined surfaces of the sleeve segment and the bush is at least 1. The sliding bearing according to claim 1, wherein the sliding bearing is at least °. 3. A sleeve guide is provided between the sleeve segment and the rotary shaft, and a bush guide is provided between the bush segment and the fixed side, and a combination of each segment and the guide is provided on the rotary shaft and the fixed side, respectively. The slide bearing according to claim 1 or 2, wherein the slide bearing is detachably connected.