JPH09126232A - Bearing structure in which penetration of impurity is prevented - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly prevent penetration of impurity by a simple structure without regularly supplying oil as the conventional case. SOLUTION: This bearing comprises a rotor 2 rotatively fittingly supported to a spindle 1, a collar 5 which is fixed to the spindle 1 by being slid on both sides of the rotor 2 so that the rotor 2 is rotatively supported in the fixed position of the spindle 1, a seal ring 7 arranged concentrically with the collar 5 having a different diameter, and an elastic plate 6 arranged between the seal ring 7 and the collar 5 so that the seal ring 7 can be slid on a rotor 2 side surface so as to be brought in contact therewith while retaining water- tightness. Hereby, a foreign matter in soil water can be prevented from being penetrated into the bearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a bearing that prevents impurities from entering, and particularly to a bearing part of a sand basin in a sewage treatment plant, a settling rake installed in a sedimentation site, a sludge attractor, etc. The present invention relates to a structure of a bearing in which impurities are prevented from entering so that foreign matter in dirty water such as sand is surely prevented and a simple structure is used to protect the bearing.

[0002]

2. Description of the Related Art A sand basin in a sewage treatment plant, a settling machine M installed in a settling basin, a sludge rake, etc. are installed along an endless chain C along the longitudinal direction of the pond and near the water surface. The endless chain is stretched and meshed with sprocket wheels that are rotatably supported on a plurality of shafts, and flights or V buckets B are attached to the endless chains at predetermined intervals. The bucket is moved along the bottom of the pond, and the sand and sludge that settled on the bottom of the pond are scraped up and lifted up and discharged outside the pond. The bearings disposed in the dirty water are intruded by sand and impurities in the dirty water, and the life of the bearing is significantly impaired.Therefore, a rotating body such as a sprocket wheel that is rotatably supported is usually supported by the following method. It Collars are arranged on both sides of the sprocket wheel 2 which is rotatably fitted to the underwater shaft, and an oil seal is fitted to the boss portion of this sprocket wheel, and the sprocket wheel is rotatably fitted to the underwater shaft. There is a seal type in which collars are arranged on both sides of the sprocket wheel, and ring-shaped seal grooves are formed on the inner surfaces of the collar and the sprocket wheel boss that face each other, and ring seals are fitted into these grooves.

[0003]

[Problems to be Solved by the Invention] The sprocket wheel 2 to be disposed in the dirty water containing impurities such as sand and dust.
In the oil seal type in which an oil seal is fitted to the boss portion 20 of the above, when the sleeve and bush fitted to the outer circumference of the submersible shaft due to use in dirty water mixed with foreign matter are slidingly worn, the shaft center shifts and the lip of the seal There will be gaps on the surface. The sealing performance rapidly deteriorates in this gap. Further, in the seal type in which the ring-shaped seal groove is formed on the inner surface of the collar 5 and the inner surface of the boss portion 20 of the sprocket wheel 2 facing the collar 5, and the ring seal is fitted in this groove, the groove and the seal are separated from each other. Foreign matter easily enters the sealing surface through the gap between them and the sealing effect is not sufficient. Therefore, in order to maintain this sealing performance, refueling is regularly performed. However, this refueling requires time and labor, and requires auxiliary equipment for pumps and pipes, which requires further maintenance. Further, even in this case, there is a problem that it is not possible to reliably prevent the invasion of foreign water such as dirty water and sand contained in the dirty water.

The present invention solves the problems of the above-mentioned conventional bearings, and has a simple structure, which prevents impurities from entering without failing to perform regular oil supply, unlike the conventional bearings. It is intended to provide the structure of.

[0005]

In order to achieve the above object, the structure of the bearing of the present invention, which is provided with the prevention of the intrusion of impurities, is
A rotating body that is rotatably fitted and supported on a supporting shaft, and a collar that is slidable on both sides of the rotating body and fixed to the supporting shaft to rotatably support the rotating body at a fixed position of the supporting shaft, This collar is composed of a seal ring arranged concentrically and with a different diameter, and a seal ring slidable on the side surface of the rotary member so as to maintain watertight contact and an elastic plate provided between the collars. It is characterized in that it is arranged so as to prevent the entry of foreign matter in the dirty water.

According to the structure of the bearing of the present invention having the above-mentioned structure for preventing the intrusion of impurities, the seal ring is brought into contact with the outer surface of the boss portion of the rotating body by the spring pressure so as to be slidable. The rotation can be performed smoothly and the watertightness is maintained by this seal ring, so that the intrusion of impurities in the dirty water can be surely prevented with a simple structure.

Further, the structure of the bearing of the present invention for preventing the intrusion of impurities has a rotating body which is rotatably fitted and supported on a supporting shaft and a supporting shaft which is slidable on both sides of the rotating body. A collar that is fixed and rotatably supports the rotating body at a fixed position on the support shaft, an elastic plate that is fixed to the boss of the rotating body, and an elastic plate that is slidable with the outer surface of the collar to maintain watertightness. It is characterized in that it is composed of a seal ring to be brought into contact with the seal ring so as to prevent the entry of foreign matter in the waste water.

According to the structure of the bearing of the present invention having the above-mentioned structure for preventing the intrusion of impurities, the elastic plate attached to the boss portion of the rotating body is attached to the outer surface of the collar that rotatably supports the rotating body on the support shaft. Since the seal ring provided at the contact point can be slid by spring pressure, the rotation of the rotating body can be performed smoothly, and the watertightness is maintained between the seal ring and the collar to ensure reliable drainage. It is possible to prevent the invasion of impurities.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the structure of the bearing of the present invention which prevents the intrusion of impurities will be described below with reference to the drawings. In a sludge attractor or the like installed in a sand basin or sedimentation basin of a sewage treatment plant, the support shaft 1 of the sprocket wheel that meshes with the endless chain of the sludge attractor or the like is along a drive path along which the endless chain moves. It consists of a support shaft arranged above the water surface and a submersible shaft arranged in water, and rotates a rotating body 2 such as a sprocket wheel that meshes an endless chain with a flight or bucket attached at a predetermined position of this support shaft. Support freely.

As shown in detail in FIG. 1, the rotary body 2 has a sleeve 3 and a bush 4 fitted concentrically on the outer circumference of a support shaft 1 in order, and the boss portion 20 of the rotary body 2 is fitted on the outer circumference of the bush 4.
The collars 5 and 5 are disposed on both sides of the rotary body in order to rotatably support the rotary body in a fixed position on the support shaft, and the rotary body 2 or the illustrated body is provided between the collars 5 and 5. The sleeve fitted to the inner peripheral surface of the boss is clamped,
Moreover, the collars 5 and 5 are fixed to the support shaft with set bolts or the like.

An elastic plate 6 is attached to the outer surfaces of the annular collars 5 and 5 which are thus freely supported by the support shaft 1, and a seal ring 7 is attached to the tip, that is, the outer end of the elastic plate. The seal ring and the collar are concentrically and radially differently arranged on the outer periphery of the support shaft 1, and the inner side surface of the seal ring is abutted against the outer side surface of the boss portion 20 of the rotating body 2 so that the seal ring is abutted. Watertightness is maintained by pressure contact force. With such a structure, impurities such as sand do not enter from other than the contact surfaces between the seal ring and the boss portion, and the elastic plate can secure the pressing force of the seal ring, which is 1/100 of the surface pressure of the bush. The surface pressure is low, and wear can be significantly reduced with the minimum pressure required to prevent sand from entering.

In the embodiment shown in FIG. 1, the inner surface of the seal ring is directly slidably provided on the outer surface of the boss portion 20 of the rotating body 2, but in the embodiment shown in FIG. Although the seal ring is arranged on the outer side surface of the boss portion 20 in the same manner, the liner 8 is arranged on the side surface of the boss on which the seal ring abuts and slides. The frictional resistance during movement is reduced to maintain watertightness and to rotate lightly. In this embodiment, the seal ring and the liner may be made of ceramic, or the contact surface may be lined with a superalloy, as a measure for reducing the wear of the sliding portion.

In the embodiment shown in FIG. 3, the collars 5 and 5 are used.
The flexible sheet 9 is attached to the inner surface of the elastic plate 6 attached to the outer surface of the flexible sheet 9 so as to be integrated, and the seal ring 7 is attached to the inner side of the flexible sheet 9 and to the tip or outer end of the elastic sheet 6. It is a thing.

As described above, in the embodiments shown in FIGS. 1, 2 and 3, the elastic plate 6 is abutted against the collar 5, the seal ring 7 is attached to this elastic plate, and the elastic force of this elastic plate is used to seal the seal. The ring contacts the boss of the rotating body to maintain watertightness, and the shape of this elastic plate can be various shapes as shown in each drawing of FIG. In the one shown in FIG. 4, the elastic body is made into a rim shape instead of a flat spring plate, and in combination with the flexible sheet shown in FIG. 3, sand injection is prevented, flexibility is increased, and a large amount of deformation is achieved. The amount of wear allowed can be increased.

The embodiment shown in FIG. 5 is different from the embodiment shown in FIGS. 1, 2 and 3 in that a seal ring 7 is attached to an elastic plate 6 which abuts against the collar 5 and a spring guard 10 is provided outside the elastic plate. It is the one along the line. Further, the elastic body in this case can reverse the bending of the leaf spring and provide a spring guard on the outer side thereof to prevent the elastic body formed of the thin plate from being deformed by pebbles or the like. Further, although the spring guard 10 is fixed to the seal ring side, it may be fixed to the collar side.

FIG. 6 shows a different embodiment, in which the collar is slidable with the collar when the rotor is rotated at both side positions on the inner peripheral side of the boss of the rotor rotatably fitted to the support shaft. And the outer peripheral side of the boss is fixed with the elastic plate 6 on the collar 21 formed as shown in the figure, and the seal ring 7 is attached to the inner peripheral side of the elastic plate. The seal ring 7 is slidably brought into contact with the outer surface of the collar 5. Also in this embodiment, the shape of the elastic plate can be various shapes as shown in FIG. In this case, the sliding radius is small and the sliding distance can be shortened.

[0017]

According to the structure of the bearing of the present invention which prevents the invasion of impurities, it is possible to easily perform the processing by the conventional technique without performing complicated processing, and also to improve the axial center due to the wear of the bush and the sleeve. Even if a gap occurs, the watertightness is maintained at the sliding surface between the seal ring and the boss, so the sealing performance does not deteriorate, and the seal ring is constantly pressed by the elastic body, so the seal Even if the ring wears, there is an advantage that the required watertightness is always maintained, impurities are prevented from entering, and the life of the bearing is extended.

According to the structure of the bearing in which impurities are prevented from entering according to the second aspect of the present invention, the seal ring is slidably brought into contact with the outer side surface of the collar by the elastic plate attached to the boss portion. Therefore, there are advantages that the mounting is simple, the watertightness can be reliably maintained, the sliding radius is small, and the sliding distance can be shortened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the structure of a bearing in which the invasion of impurities is prevented according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the structure of the bearing of the present invention, which is protected from the intrusion of impurities.

FIG. 3 is a sectional view showing a third embodiment of the structure of the bearing according to the present invention, which is provided with the prevention of impurities from entering.

FIG. 4 shows a front view of an elastic body of the present invention, (A),
(B) and (C) show different shapes.

FIG. 5 is a sectional view showing a fourth embodiment of the structure of the bearing of the present invention, which is provided with the prevention of the intrusion of impurities.

FIG. 6 is a cross-sectional view showing a fifth embodiment of the structure of the bearing of the present invention, which is protected from the intrusion of impurities.

FIG. 7 is a sectional view showing an example of a conventional underwater bearing structure.

FIG. 8 is an explanatory diagram showing a panoramic view of a sand blasting machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support shaft 2 Rotating body 20 Boss portion 21 Collar 3 Sleeve 4 Bushing 5 Collar 6 Elastic plate 7 Seal ring 8 Liner 9 Flexible sheet 10 Spring guard

Claims (2)

[Claims] 1. A rotating body rotatably fitted and supported on a support shaft, and slidable on both sides of the rotating body and fixed to the support shaft so that the rotating body is rotatable at a fixed position of the support shaft. A collar to be supported, a seal ring concentric with the collar and a diameter different from each other, and a seal ring slidably mounted on the side surface of the rotor to be kept watertight and provided between the seal ring and the collar. A structure of a bearing that is provided with an elastic plate to prevent the intrusion of foreign matter in the wastewater, and is provided with the intrusion of impurities. 2. A rotating body rotatably fitted and supported on a support shaft, and slidable on both sides of the rotating body and fixed to the support shaft so that the rotating body is rotatable at a fixed position of the support shaft. It consists of a collar to support, an elastic plate fixed to the boss part of the rotating body, and a seal ring that slidably contacts the elastic plate with the outer side surface of the collar to maintain watertightness, and A bearing structure that prevents impurities from entering, which is characterized by preventing entry.