JPS58217815A - Submerged bearing protective means - Google Patents

Abstract

PURPOSE:To improve the sealing effect by defining an annular presurized clear water sump. by the enclosers of a sealing plate, the external peripheral face of a hub and the side face of the periphery of a collar by forcing a lip of the sealing plate to come into contact with the side face of the periphery of the collar. CONSTITUTION:Water pressure is applied to a sealing plate 19, which presses a lip 19' against the side face 12 of the periphery of a collar 10. To the contrary, pressurized clear water sent from the opening of a supply nozzle 7 is squeezed into a pressure sump 20 to boost a pressure therein, forcing the lip 19' of the sealing plate to open outward. Resultingly, clear water is jetted from the clearance toward the entire surface of the side face 12 of the periphery of the collar 10, to blow away foreign substances which tend to come to the proximity of peripheral side face 12 of the periphery of the collar 10, whereby preventing them from penetrating into a bearing.

Description

[Detailed Description of the Invention] (l) The present invention is applicable not only to sand removal in water treatment ponds, but also to sewage treatment, sewage treatment, and more! This invention relates to an underwater bearing protection device that prevents premature wear of bearings used in locations with many foreign substances such as sand and sludge, such as sedimentation ponds in various industries such as those related to FI production.

The present invention applies to submersible bearings for various devices that rotate in water in sewage treatment facilities, such as sludge scrapers, sand raking machines, and mechanical stirring devices used in sewage treatment plants, as well as ordinary water wheel bonders and other devices for pumping muddy water. Can be used for bonder underwater bearings.

In this type of bearing, the prior art for preventing foreign substances such as sand and sludge contained in water from entering the bearing has been disclosed in Japanese Patent Application No. 52-84749 filed by the inventor of the present invention.
The present invention relates to improvements thereto.

As shown in FIG. 1, the invention of the above-mentioned application has an outer diameter of a collar 10 fitted and fixed to a shaft 2 that is larger than an outer diameter of a hub 5 of the bearing, and a collar 10 that is fitted and fixed to a shaft 2 and has an outer diameter larger than that of a hub 5 of the bearing. A large number of inclined water holes 7 are provided on the outer circumferential surface 5' of the hub, and fresh water under pressure is sprayed onto the outer circumferential side surface 1σ of the collar with the inclined water holes 7 (2). This prevents foreign substances such as sand and sludge in the water from entering the inside of the bearing through the annular opening formed by the outer circumferential surface of the pool and the outer circumferential side surface of the collar.

In this way, since fresh water is sprayed from the inclined water hole 7 to the outer circumferential side surface 10' of the collar, it is possible to prevent foreign matter such as sand from getting into the gap between the openings. However, since it is used as a bearing device for chain cos/peis of devices such as sludge scrapers installed near the bottom of ponds such as Shenwei Pond, the sludge is stirred and floated on the pond bottom by the scraping operation. If there are many foreign substances such as sand, it is desirable to further improve the sealing effect.

The technical problem of the present invention is to provide a protection device for a submersible bearing equipped with a fluid seal mechanism, in which fresh water is pumped through the water passage hole of the spring to uniformly flow the water under pressure to the entire outer circumference of the collar. (3) In addition to blowing out the water, it is also necessary to prevent foreign substances such as sand and sludge floating in the water from coming near the blow-off opening of the water passage hole.

A ninth configuration of the present invention, that is, a technical means for solving the above-mentioned technical problem, is that in a protection device for an underwater bearing, the frontage of the water hole provided on the outer peripheral surface of the hub is located on the side opposite to the collar.・A seal plate is installed on the outer peripheral surface of the knob, and an annular fresh water pressure reservoir is formed between this seal plate, the outer peripheral surface of the knob, and the outer peripheral side of the collar, and the ring of the seal plate is attached to the outer peripheral surface of the collar. It is characterized by being brought into contact with the outer circumferential side surface.

The above technical means works as follows.

During operation of the underwater bearing protection device, fresh water in the annular groove of the hub passes through the water passage hole and is blown out from the opening into the fresh water pressure reservoir.

The fresh water under pressure forms a uniform annular pressure header in the fresh water pressure reservoir 9, and the outer circumferential side of the collar pushes the lip of the seal plate, which is in sliding contact, with this pressure toward the outside of the bearing. Expand elastically towards.

(4) By expanding this ring part, fresh water is blown out along the entire outer peripheral side surface of the collar before the fresh water pressure reservoir and flows outward in the inner diameter direction of the collar, so that the sealing machine and Foreign matter such as sand and sludge near the outer circumferential side of the engineering collar is blown away by the flow of fresh water to prevent these foreign matter from entering the bearing.

On the other hand, if the pump that supplies fresh water breaks down or stops, etc., and the pressure of fresh water drops below the specified pressure, the water pressure of the treated water in the sedimentation tank or the seal plate will be removed. If the lip of the plate is pushed toward the outer circumferential side of the collar, it will act in the opposite direction, so even in such a case, there will be no pressure inside the bearing. Intrusion of foreign matter is prevented.

The present invention is advantageous in that the above structure is combined with the sealing effect of the fluid seal and zero ring in the prior art, and the blowing of fresh water from the ring portion of the seal plate acts over the entire rravc of the outer circumferential side of the collar. In addition to being able to produce a strong sealing effect (5), in addition to agitating and suspending foreign substances such as sand and sludge on the pond bottom that are generated during the operation of devices such as sludge scrapers, it also creates an area in the fresh water that is blown out. Even if foreign matter that has been blown away comes closer to the outer circumferential surface of the above-mentioned tube again, most of the foreign matter will be prevented from entering the bearing by the seal plate.

Furthermore, the seal fi can be easily attached using a normal fixing method.

As described above, the present invention has an extremely simple overall structure of a bearing device, yet provides a strong sealing effect against foreign substances such as sand and sludge.

Kotobuki: The outer surface of the collar above may have a vertical cross-section, but the conical surface with an inclined cross-section makes it easier to dislodge foreign matter and provides good sliding contact with the lip of the sealing machine. This is advantageous because even if the lip wears out, its function will not be impaired.

The above-mentioned seal plate may be made entirely of an elastic material such as rubber or synthetic resin, but it may also have a reinforcing plate made of metal or the like embedded in it except for the lip part, or (6) one that is glued to one side. It is best to use it as appropriate depending on the usage situation.

Further, the water passage hole formed by opening from the annular groove to the outer circumferential surface of the hub may be formed in a slanted shape. This makes it easier to manufacture the L-shaped water passage and slots.

Next, an embodiment of the technical means of the present invention will be described with reference to the drawings.

Fig. 2 shows a concrete example of a dead water bearing protection device l in which the knob 5 of the check/wheel 14 is rotatably supported on a fixed shaft and collars lO are placed on both ends of the chuck 5. There is.

The collar lO has a U-shaped cross section with a large diameter of 5 knobs,
Both ends of the hub 50 are fitted into the cylindrical portion 13 of this collar IO, and an 0 ring 11 is fitted onto the inner peripheral surface of this circle 11lls13, thereby forming a sealing device using 0s/g.

The collar IO is fixed to the shaft 2 via a sleeve 9 which is fitted onto the shaft 2 by means of a medium diameter screw 15.

This sleeve 9 is shown to be manufactured separately from the collar 1O, or may be manufactured integrally with the collar 1O.

The water holes formed in the hub 5 include a vertical water hole 7L and a linear water hole 7', with one end of the water hole 7' communicating with the annular groove 6. The water hole 7 has one end opened near the outer peripheral side surface 12 of the collar 10 on the outer peripheral surface of the hub 5, and the other end communicates with the water passage hole 7'.

This water passage hole 7' may be a concave groove formed on the inner circumferential surface of the hub 5 into which the bearing bush 8 is fitted, as shown in the figure, but it may be formed with a water passage hole that is not exposed on the inner circumferential surface of the hub 5. It can be anything.

Also, instead of forming the water hole in an L-shape like this, it is also possible to form it with a single slanted water hole, or as shown above in the L-shape.
It is easier to manufacture the machine with a letter-shaped water hole.

The annular groove 6 is provided at the center of the hub 5 in order to equalize the lengths of the symmetrical water passage holes 7 and 7' and to prevent any difference in water passage resistance.

The annular groove 6 is configured such that fresh water is pumped from the outside of ll+2 through the water passage hole 4 in the shaft center and the water passage hole 3 in the inner diameter direction of the shaft, and further through the sleeve 9. has been done.

The lip 19' of the seal plate 19 mounted on the outer circumferential surface of the hub b with respect to the outer circumferential side surface 12 located on the inner side facing each of the collars 10 and 10 attached to both ends of the hub b.
is in contact.

The attachment portion 19'' of the seal [119] is appropriately fixed on the outer peripheral surface of the hub on the opposite side to the outer peripheral side 11f12 of the collar with respect to the opening of the water passage hole 7.

A pressure reservoir 20 of fresh water is formed in this seal f119 in an annular space surrounded by the outer circumferential surface 5' of the L shhab and the outer circumference 1tllvrI12 of the collar.

A flange 14 is provided at the center of the outer circumferential surface 5' of the hub, and a chain/swing rocket or the like (not shown) can be attached to this flange 14.

In addition, the flange 14 can also be disposed at an appropriately shifted position from the center of the engineering ship to the end thereof depending on the mounting position (9) of a tin rocket or the like.

A water supply pipe 16 is connected to the water passage hole 4 in the shaft center.

17 is a bolt for fixing the bearing bush to the hub 5, and is is a shaft coupling.

To describe the effect of the embodiment, the seal 819 is exposed to water pressure at the bottom of a sewer or sewage treatment pond, etc., and the lip 19' is pressed against the outer periphery 1111Jl [I12 of the collar, but the external part (not shown) The fresh water under pressure from the opening is passed through the fresh water passage by the pump to the pressure reservoir υ2.
0, and the pressure of this pressure reservoir causes the seal plate glue cup 19' to expand outward, causing clean water to flow from the expanded gap over the entire outer peripheral side surface 12 of the collar. This seal 119 blows away foreign matter such as sand and sludge that collects near the outer peripheral side surface 12 of the collar 10, thereby effectively preventing foreign matter from entering the inside of the bearing.

In the embodiment shown in FIG. 3, a device (lO
) The collar 10 that fits on the shaft end has a rounded cross section, and the lower surface 2 of the flange of the collar 10 is
A thrust needle bearing 23 is disposed between the thrust surface 22 of the bearing metal 8 and the bearing metal 8.

Is the structure such that fresh water is supplied directly from the outside of the knob 5 to the annular groove 24 without passing through the shaft? It is the same as the example.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of a conventional underwater bearing protection device, Fig. 2 is a longitudinal sectional side view of the underwater bearing protection device of the present invention, and Fig. 3 is a longitudinal sectional side view of a conventional underwater bearing protection device. 2: @11 5 which is a vertical side view showing another applied example.
: Hub 6.25: Annular groove 7. 7': Water hole lO; Collar 19: Seal plate 19': Ring
20: Pressure reservoir special grant applicant Masaaki Nagashima (l l) Figure 1, 1, Figure 2

Claims (1)

[Claims] A collar fixed to the shaft is opposed to the end of the hub, a sealing device is provided between the facing surfaces of the collar and the collar, and a bearing is installed between the sliding surfaces of the shaft and the inner circumference of the hub. An annular groove for press-fitting fresh water into the surface is formed, and the fresh water lubricates the bearing and forms a fluid seal using the fresh water.The outer diameter of the collar is larger than the outer diameter of the hub, and A water hole that communicates with the hub and opens on the outer circumferential surface of the hub.
In the underwater bearing protection device provided on the outer circumferential surface of the hub, a sealing plate is mounted on the outer circumferential surface of the hub on the side opposite to the collar of the opening on the outer circumferential surface of the hub, and the sealing plate and the outer circumferential surface of the hub are An underwater bearing protection device characterized in that an annular fresh water pressure reservoir is formed between the surface and the outer circumferential side of the collar, and a ring of the seal plate is brought into contact with the outer circumferential side of the collar.