JPH06173942A - Bearing structure for rotary machine - Google Patents

Abstract

PURPOSE:To facilitate the replacement of a bush and prevent the biting of a foreign object by making the inner diameter of an upper block smaller than the inner diameter of a lower block, and bringing the half-bush arranged on the inner periphery of the lower block into contact with the end face of the upper block in a half-split bearing block vertically split into two. CONSTITUTION:A bearing 11 is constituted of a half-split cylindrical upper block 11a and a lower block 11b, and they are connected with bolts 12 and nuts 13. A half-bush 14 is coupled and arranged on the inner periphery side of the lower block 11b. The outer diameter size of the bush 14 is set larger than the inner diameter size of the upper bush 11a, and the inner diameter size is set smaller than the inner diameter size of the upper block 11a. The junction end face 15 of the upper block 11a is brought into contact with the end face 16 of the bush 14, and it exerts the detent function to fix the bush 14. The bush 14 may be merely mounted on the inner periphery side of the lower block 11b, and it is not required to be fixed with bolts from the outside of the block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half block type bearing structure for supporting a rotary shaft of a rotating machine for heavy objects.

[0002]

2. Description of the Related Art For example, as a conventional rotating machine for heavy objects, a sewage treatment apparatus 1 as shown in FIGS.
There is. This apparatus 1 is configured to rotatably support a rotating gas 3 in a water tank 2, and realizes high-performance treatment of wastewater by simultaneously performing an activated sludge treatment method and a biofilm treatment method. Thus, the rotating gas 3 is a cylindrical rotating body formed by assembling the segment 5 composed of the plastic corrugated plate around the rotating shaft 4. The corrugated plates of the segment 5 are arranged at a pitch of 30 mm, and the ribs on the outer peripheral surface are joined to each other so that they are brought into close contact with each other to form an independent space between the plates.

By the rotation of the rotating gas 3 so that a large amount of air is retained in a large number of independent spaces in the segment 5 while being immersed in the water, a large amount of air is supplied to the water to the surface of the wavy plate. The sewage treatment by the attached aerobic microorganisms is activated. On the other hand, aquarium 2
Activated sludge is put inside. Therefore, a large amount of air is supplied to the activated sludge by the segment 5, and the treatment of the activated sludge with aerobic microorganisms is activated.

By the way, such a rotating gas 3 is
It weighs 10 tons and is extremely heavy. Therefore, in consideration of the installation and maintenance of heavy objects, the bearing 6 that supports the rotating gas 3 is a half-divided bearing that is divided into upper and lower blocks 6a and 6b as shown in FIGS. I am trying to use it. Usually, the upper block 6a of the bearing 6 is removed, and the rotary block body 3 is supported on the lower block 6b for maintenance or the like. This is a heavy object with 10 tons of rotating gas 3, and even if it is installed horizontally, the rotating gas 3 is lifted by overhauling, etc. This is because it is necessary to remove the mounting bolt to the water tank, which makes it extremely difficult to adjust the levelness.

As shown in FIGS. 5 and 6, the rotating gas 3
A cylindrical metal 7 is externally fitted and fixed to the outer peripheral surface of the rotary shaft 4 by a screw 8, and a cylindrical synthetic resin bush 9 is fixed to the inner peripheral surface of the bearing 6 by a bolt 10. Has been done. The metal 7 and the bush 9 are for preventing the rotary shaft 4 and the bearing 6 from coming into direct contact with each other so as not to wear, and replace the metal 7 and the bush 9 so that they wear. I am trying to maintain it.

[0006]

Therefore, in the conventional bearing 6 for the rotating aeration gas 3, in order to prevent rotation,
Push the bush 9 to the lower block 6b from the outer peripheral surface side to the bolt 1
Since it is necessary to screw 0 to fix it, there is a drawback that the thickness of the portion of the bush 9 that can be effectively used (wearable portion) is reduced by the amount of engagement between the bolt 10 and the bush 9.

When the bush 9 is worn, it is necessary to loosen the bolt 10 to remove the bush 9 from the bearing 6, install a new bush 9 and fix the rotation stopper with the bolt 10. However, the bolt 10 and the bush 9
Since the position alignment with the screw hole cannot be performed while directly confirming it visually, it must be performed from the outside of the lower block 6b by the operator's feeling, which is very troublesome.

Further, in the sewage treatment apparatus 1, the activated sludge treatment is carried out at the same time as the biofilm treatment, and the sewage also contains a large amount of components such as inorganic silica (SiO ₂ ) mixed with earth and sand. . Therefore, the inorganic particles are metal 7
And bush 9 made of synthetic resin.
May be embedded in. When the inorganic particles are embedded in the bush 9 in this way, the inorganic particles act as a grindstone, and the metal 7 on the rotating shaft 4 side is ground to accelerate the wear thereof, which significantly shortens the life. There was a drawback.

[0009]

SUMMARY OF THE INVENTION The present invention has been made by improving and removing the conventional problem in view of the above-mentioned problems. It is not necessary to fix the bush, and the replacement work is easy. It is intended to provide a bearing structure of a rotary machine capable of preventing the above-mentioned problems.

Therefore, in order to solve the above-mentioned problems, the means adopted by the present invention is to make the inner diameter of the upper block smaller than the inner diameter of the lower block in a half-divided bearing block which is vertically divided into two parts. The bearing structure of a rotary machine is characterized in that a half-divided bush is arranged on the inner peripheral surface of the lower block, and both end surfaces of the bush are brought into contact with the end surfaces of the upper block. Another means adopted by the present invention is that, in a half-divided bearing block that is vertically divided into two parts, the inner diameter of the upper block is made smaller than the inner diameter of the lower block, and the inner peripheral surface of the lower block is halved. -Shaped bush is provided, both end surfaces of the bush are brought into contact with the end surface of the upper block, and a space for removing foreign matter is provided between the inner peripheral surface of the upper block and the outer peripheral surface of the rotating shaft. It is a bearing structure of a rotating machine.

[0011]

In the present invention, the bush is formed in a half-split shape (semi-cylindrical shape) and fitted on the inner peripheral surface of the lower block.
Therefore, the bush is prevented from rotating by the end surface of the upper block, and it is not necessary to fix the bush through bolts or the like, and the thickness that can be effectively worn is the net wall thickness of the bush, which prolongs the service life. Can be achieved. Further, compared with the case where the bush is cylindrical, only half the material is required, which is advantageous in terms of cost.

Further, in another means of the present invention, in addition to the above means, a space for removing foreign matter is formed between the inner peripheral surface of the upper block and the outer peripheral surface of the rotary shaft. for that reason,
Even if foreign matter such as inorganic particles is mixed between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the block, the inorganic particles are bushes fitted to the inner peripheral surface of the lower block on the terminal side of the foreign matter removing space. By doing so, it is possible to prolong the service life of the rotary shaft without having to grind a foreign substance to function as a grindstone unlike the conventional case.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the embodiments shown in the drawings. The same reference numerals as in the conventional case are the same members. 1 and 2 relate to an embodiment of the present invention. FIG. 1 is a front view of a bearing 11,
FIG. 2 is a vertical sectional side view of the bearing 11. As shown in the figure, the bearing 11 of this embodiment is composed of an upper block 11a and a lower block 11b, which are in the shape of a half cylinder, and are connected by bolts 12 and nuts 13. Therefore,
A bush 14 made of synthetic resin and having a half-divided shape is fitted and disposed on the inner peripheral surface side of the lower block 11b.

As for the size of the bush 14 in the radial direction, its outer diameter is set to be larger than the inner diameter of the upper block 11a, and the inner diameter is set to be smaller than the inner diameter of the upper block 11a. There is. Therefore, when the upper and lower blocks 11a and 11b are fastened with the bolts 12 and the nuts 13, the joining end surface 15 of the upper block 11a comes into contact with the end surface 16 of the bush 14, and the bush 14 is fixed to prevent rotation. Will be fulfilled.

For this reason, in the case of this bush 14, it is sufficient to simply mount it on the inner peripheral surface side of the lower block 11b, and it is fastened from the outside of the block with bolts or the like as in the conventional case and fixed to prevent rotation. Bush 1
It is possible to remarkably simplify the replacement and assembly work of No. 4, and it is also possible to increase the effective wear allowance of the bush 14 to extend its life.

As described above, since the inner diameter of the upper block 11a is set larger than the inner diameter of the bush 14, the outer peripheral surface of the metal 7 fitted and fixed to the outer peripheral surface of the rotary shaft 4 and the upper block. A space 17 is formed between the inner peripheral surface of 11a. This space 17
Serves as a space for removing foreign matter. That is, even if the inorganic particles adhere to the foreign matter removal space 17 between the outer peripheral surface of the rotating shaft 4 (the outer peripheral surface of the metal 7) and the inner peripheral surface of the block 11a, the inorganic particles move forward in the rotation direction. The end surface comes into contact with the end surface side of the bush 14 and is scraped off by the end surface side.
There is no break in between.

Therefore, the inorganic particles and the like are embedded in the inner surface of the bush to function as a grindstone as in the conventional case, and the metal 7 of the rotary shaft 4 is not ground to be worn early.

By the way, the present invention is not limited to the above-mentioned embodiments, but can be appropriately modified. For example, although the bush 14 has been described as being made of synthetic resin, it is natural that it may be made of metal.

[0019]

As described above, according to the present invention,
The bush is formed in a half-cylindrical shape, and is fitted and arranged on the inner peripheral surface of the lower block. Therefore, the bush is fixed by the end surface of the upper block in the state where the upper block and the lower block are fastened to each other, and its rotation is prevented. As a result, it is not necessary to fix the bush to the lower block via bolts, etc., and it is possible to significantly simplify the disassembling and assembling work of the bearing, and increase the effective wear allowance of the bush to extend its life. Is possible. Further, compared with the case where the bush is cylindrical, only half the material is required, which is advantageous in terms of cost.

Further, in another means of the present invention, in addition to the above means, a space for removing foreign matter is formed between the inner peripheral surface of the upper block and the outer peripheral surface of the rotary shaft. for that reason,
Even if foreign matter such as inorganic particles is mixed between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the block, the inorganic particles are bushes fitted to the inner peripheral surface of the lower block on the terminal side of the foreign matter removing space. As a result, the foreign matter does not act as a grindstone as in the conventional case, and the life of the rotary shaft can be extended.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing a bearing according to the present invention.

FIG. 2 is a vertical sectional side view of a bearing according to the present invention.

FIG. 3 is a partial vertical cross-sectional front view showing a rotary machine of a conventional sewage treatment apparatus.

FIG. 4 is a partial vertical cross-sectional side view showing a rotary machine of a conventional sewage treatment apparatus.

FIG. 5 is a partial sectional front view showing a conventional bearing.

FIG. 6 is a partial vertical sectional side view showing a conventional bearing.

[Explanation of Codes] 4 ... Rotating shaft 7 ... Metal 11 ... Bearing 11a ... Upper block 11b ... Lower block 14 ... Bush 17 ... Foreign matter removing space

Claims (2)

[Claims] 1. In a half-divided bearing block that is divided into upper and lower halves, the inner diameter of the upper block is smaller than the inner diameter of the lower block, and a half-divided bush is provided on the inner peripheral surface of the lower block. A bearing structure for a rotary machine, wherein both end surfaces of the bush are brought into contact with the end surface of the upper block. 2. In a half-divided bearing block that is divided into two parts, the inner diameter of the upper block is smaller than the inner diameter of the lower block, and the half-divided bush is arranged on the inner peripheral surface of the lower block. Then, both end surfaces of the bush are brought into contact with the end surface of the upper block, and a space for removing foreign matter is provided between the inner peripheral surface of the upper block and the outer peripheral surface of the rotating shaft. .