WO2014010027A1

WO2014010027A1 - Sliding part degradation detection system for submerged bearing

Info

Publication number: WO2014010027A1
Application number: PCT/JP2012/067564
Authority: WO
Inventors: 大幸末廣; 盛男末廣
Original assignee: スエヒロシステム株式会社
Priority date: 2012-07-10
Filing date: 2012-07-10
Publication date: 2014-01-16
Also published as: KR20150046782A; KR101613163B1; JPWO2014010027A1; CN104395622A; JP5869127B2; CN104395622B

Abstract

[Problem] To provide a sliding part degradation detection system for a submerged bearing, whereby degradation over time of a submerged bearing can be precisely and easily detected. [Solution] This sliding part degradation detection system (10) for a submerged bearing is characterized by being provided with a sliding part degradation detection tube (40) connected to a bearing housing (24) of a submerged bearing (20) provided with a bearing housing (24) for supporting a rotating shaft in water, and a grease supplying means (30) for connecting to the bearing housing (24) and supplying grease at a predetermined pressure to a gap against the rotating shaft, the sliding part degradation detection tube (40) for releasing to the atmosphere the grease pressure of the grease that has moved through the bearing housing (24).

Description

Underwater bearing sliding part deterioration detection system

The present invention relates to a sliding part deterioration detection system for a submerged bearing that detects aged deterioration due to wear of a submerged bearing attached to a rotary device such as a screw pump, and more particularly to a submerged bearing capable of accurately and easily detecting aged deterioration. The present invention relates to a sliding part deterioration detection system.

There is a screw pump that pumps water from low to high. FIG. 4 is a schematic view of the overall configuration of a conventional screw pump. As shown in the figure, the screw pump 1 includes an impeller 3 having blades that are continuous with the outer peripheral surface of the rotary shaft 2 and spirally protruded, and an upper bearing 4 that supports the upper end side of the rotary shaft 2 on land. The underwater bearing 5 supports the lower end side of the rotating shaft 2 underwater, and driving means 6 that is connected to the upper end of the rotating shaft 2 and rotates the impeller 3. The screw pump 1 is disposed in an inclined water channel that connects an upper water channel and a lower water channel. The screw pump 1 having such a configuration can rotate the impeller 3 by the driving means 6 to pump up water in the sewer and feed it to the upper water.

In the upper bearing 4 and the underwater bearing 5, the rotating sliding part is worn when the operating time of the rotating device is prolonged. In particular, the underwater bearing 5 that supports the rotating shaft 2 of a large-sized rotating device applied to a sewage treatment plant or a water purification plant in water is such that fine solids such as sand and mud mixed in the water rotate and slide on the bearing. If it enters the part, wear of the sliding part is promoted. For this reason, in order to prevent solid matter from entering the rotary sliding part, the part where the bearing in the water and the rotary shaft 2 slide is filled with oil, and a metal seal, rubber seal, etc., so that the oil does not leak from the sliding part, Generally, a seal is formed to separate the oil portion and the underwater portion.

Conventionally, rotating and sliding parts of underwater bearings are roughly classified into bearings by surface contact and rolling bearings. The bearing by surface contact has a structure in which the outer periphery of the sleeve fixed to the outer periphery of the rotating shaft rotates with the inner surface of the bearing metal in surface contact. Machine oil and grease can be applied as the lubricating oil of the bearing by this surface contact.

The screw pump disclosed in Patent Document 1 includes an oil supply pipe that supplies lubricating oil (mechanical oil) between the underwater bearing and the shaft portion of the screw, and a discharge that discharges the lubricating oil that has passed between the underwater bearing and the screw bearing. The oil pipe, the oil supply pipe and the drain oil pipe are connected to each other, and the storage tank collects the lubricating oil discharged from the underwater bearing, and the lubricating oil in the storage tank is lubricated so as to be discharged from the oil supply pipe through the underwater bearing. Oil supply means for circulating and supplying oil is provided. In this type of underwater bearing, the lubricating oil tends to leak from the seal portion due to the high fluidity of the lubricating oil. If oil leaks in the water, a small amount of oil film is formed on the surface of the water, and even if the absolute amount of fats and oils is small, visual environmental problems are likely to occur. For the above-mentioned reason, grease (oil / fat) which is precipitated and becomes muddy later even when wet is preferred for lubrication of the underwater bearing.

Grease with lower fluidity than lubricating oil is less likely to leak or scatter than machine oil, and has characteristics that prevent water and foreign matter from entering. When supplying grease to the bearing, the following configuration is adopted. FIG. 5 is an explanatory diagram of a schematic configuration of a conventional greasing means for an underwater bearing. As shown in the figure, the conventional grease supplying means of the underwater bearing 5 supplies grease to the rotary sliding portion from the grease supply pipe 8 connected to the oil supply port 5a of the underwater bearing 5. In the case of grease, oil that has moved in the gap between the shaft sleeve 5b and the bearing metal 5c, such as mechanical oil, is not lubricated, but is discharged into the water from the gap in the rubber seal 9. This is because the grease moves along the rotating sliding portion to absorb the frictional heat of the rotating sliding portion due to the rotation and avoid problems such as seizure of the rotating sliding portion. In addition, the grease in the underwater bearing tries to prevent water from entering the oil seal portion. However, due to such a configuration, the gap between the worn oil seal becomes large, and when solid matter such as sand 11 or mud in water enters the gap between the shaft sleeve 5b and the bearing metal 5c, it is rotated by the file effect. The sliding part was easily worn.

In addition, in the case of a rolling bearing, a bearing is used for the bearing sliding portion, and an expensive mechanical seal with high sealing performance is attached and rotated.
Further, Patent Document 2 is disclosed as a conventional method for checking wear of an underwater bearing. The vertical pump inspection method disclosed in Patent Document 2 measures the vibration of the vertical pump, monitors the magnitude of vibration in the frequency band including the natural frequency of the vertical pump, and changes the vibration with the passage of operating time. From this, the wear state of the underwater bearing is judged.

JP 2011-21586 A JP 2009-41465 A

As mentioned above, the upper bearing placed on land has no risk of intrusion of sand, mud, etc. like underwater bearings. The upper bearing is in a state where the machine oil and grease supplied into the casing are kept pressed so as to fill the gap between the rubber seal and the rotating shaft so that air does not enter from the inside to the outside atmosphere side. . The machine oil and grease pushed outward from the casing are released into the atmosphere. When the degree of wear on the rotating shaft and the bearing side of the rotating sliding portion progresses, a lot of oil and grease are released from this portion, and the sleeve, bearing metal, bearing, rubber seal constituting the rotating sliding portion Replacement work such as is necessary. Thus, in addition to visual observation, the upper bearing can easily measure the wear state of the rotating sliding portion by applying a stethoscope to the bearing.

However, since the underwater bearing is disposed in the water, it is impossible to detect the wear state of the rotating sliding portion visually as in the upper bearing. For this reason, in the case of underwater bearings, in order to measure the wear of the rotating sliding part, the pumping work must be periodically stopped and replaced regardless of the actual progress of wear. .

Also, according to the underwater bearing wear inspection method disclosed in Patent Document 2, when the rotation speed of the vertical shaft pump is high, the magnitude of vibration in the frequency band including the natural frequency can be monitored. However, a pump with a low rotational speed, such as a screw pump, which has a long distance between the fulcrum of the upper bearing and the fulcrum of the lower bearing and has a large core runout, has a large vibration, and monitoring the magnitude of the vibration is meaningless. Moreover, the width of the runout of the underwater shaft is larger than that of the upper shaft, and the portion to be measured must be the underwater shaft. It is difficult to measure vibration in water.

In order to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a sliding part deterioration detection system for an underwater bearing that can accurately and easily detect deterioration over time of the underwater bearing.

As a first means for solving the above-mentioned problems, the present invention supplies grease at a predetermined pressure to a gap between the bearing box that supports the rotating shaft in water and the bearing box connected to the bearing box. An underwater bearing comprising: a sliding portion deterioration detection pipe that is connected to the bearing housing of an underwater bearing including a grease supply means for releasing the grease pressure of the grease that has moved the bearing housing to the atmosphere. A sliding part deterioration detection system is provided.

According to the present invention, as a second means for solving the above-described problem, in the first means, the grease supply means includes a grease supply pipe connected to the bearing box, and the sliding portion deterioration detection is performed. The pipe provides a sliding part deterioration detection system for a submerged bearing, characterized in that the pipe diameter of the connection port with the bearing box is set to be equal to or greater than the pipe diameter of the greasing supply pipe. .

According to the present invention, as a third means for solving the above problems, in the first or second means, the bearing metal formed on the sliding surface of the bearing box and the rotating shaft is the rotating shaft. A submerged bearing sliding portion deterioration detection system, characterized in that a groove is formed along an outer periphery, and a connection port between the sliding portion deterioration detection tube and the bearing box is aligned with an upper end of the groove. It is to provide.

The present invention provides, as a fourth means for solving the above-mentioned problems, in any one of the first to third solving means, wherein the sliding part deterioration detecting tube is a transparent pipe or a visible pipe inside the tube. It is an object of the present invention to provide a sliding part deterioration detection system for an underwater bearing characterized by using a transparent hose capable of easily changing the discharge height of grease.
As a fifth means for solving the above-mentioned problems, the present invention provides the above-mentioned fourth solution means, wherein the bearing box is vertically connected to the atmosphere from the connecting portion of the sliding portion deterioration detection tube in water. It is an object of the present invention to provide a sliding part deterioration detection system for an underwater bearing, characterized in that an extending scale plate is provided.

The present invention provides, as a sixth means for solving the above-mentioned problems, in any one of the first to third solving means, wherein the sliding portion deterioration detection tube is branched at least one from the main tube. An on-off valve is formed in the pipe, and the plurality of branch pipes are provided with a sliding portion deterioration detection system for an underwater bearing, wherein the height positions from the water surface are different.

Conventionally, underwater bearings have not been able to visually determine how grease is discharged into the water or how the rotating sliding part is worn. For this reason, water was drained and the bearing housing of the bearing was disassembled to check the wear. In such a method, the wear condition check must be performed with the equipment stopped, and cannot be determined in daily maintenance. According to the present invention, as described above, since the sliding portion deterioration detection tube that discharges the grease supplied to the bearing housing to the atmosphere is provided, conventionally, the grease could not be discharged into the water and visually observed. Since the grease can be visually checked, there is an actual advantage that it is possible to easily detect aged deterioration of underwater bearings due to the condition of the grease, solid matter such as water, sand and mud due to deterioration and damage of the seal part. .

In addition, according to the present invention, as described above, the sliding portion deterioration detection pipe has the pipe diameter of the connection port with the bearing box set equal to or greater than the pipe diameter of the greasing supply pipe. Since the pressure loss can be reduced, the grease supplied to the bearing housing can be easily discharged to the atmosphere via the sliding part deterioration detection tube. By measuring the change in head pressure on a scale, there is an actual advantage that it is possible to detect aged deterioration of underwater bearings.

Further, according to the present invention, as described above, a groove through which grease passes is provided in the bearing metal along the outer periphery of the rotating shaft, and the sliding portion deterioration detection tube is connected to the end of the groove. Grease is evenly supplied between the bearing metals, and the sliding part deterioration detection tube is connected to the end of the groove close to the seal part. Easily detect aged deterioration of underwater bearings by detecting the state of solids such as water, sand and mud due to deterioration and damage of the seal part, and measuring the head height of the discharged grease There are real benefits that can be done.

Further, according to the present invention, as described above, since the sliding portion deterioration detection tube uses a transparent pipe and a vinyl hose, grease discharged from the bearing box and moisture mixed in the grease are discharged from the piping. In other words, even when passing through the piping, since it can be easily confirmed by visual inspection from the outside during the operation of the rotating device, there is an actual advantage that the aging deterioration of the underwater bearing can be easily determined. In addition, if a transparent hose that can easily change the grease discharge height is used, the height of the hose can be freely changed without installing a branch pipe or branch valve. Can be discharged.

Further, according to the present invention, as described above, the sliding portion deterioration detection pipe includes an on-off valve in a branch pipe branched from the main pipe, and the plurality of branch pipes have different height positions from the water surface. Since the grease is gradually leaked from the seal part into the water due to the deterioration of the seal part, if the amount of grease discharged from the slide part deterioration detection pipe decreases, the upper branch pipe to the lower branch pipe Since the position where the water is discharged changes, it is possible to easily determine the deterioration of the underwater bearing over time.

FIG. 1 is an explanatory diagram showing a schematic configuration of a sliding portion deterioration detection system for an underwater bearing according to the present invention. FIG. 2 is a sectional view of the bearing box. FIG. 3 is an explanatory diagram showing a schematic configuration of a modified example of the sliding portion deterioration detection tube. FIG. 4 is a schematic view of the overall configuration of a conventional screw pump. FIG. 5 is an explanatory diagram showing a schematic configuration of a conventional greasing means of an underwater bearing.

Embodiments of a sliding part deterioration detection system for an underwater bearing according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of a sliding portion deterioration detection system for an underwater bearing according to the present invention.

In the underwater bearing sliding part deterioration detection system 10 of the present invention, grease is supplied at a predetermined pressure to a gap between the bearing box 24 that supports a rotating shaft in water and the bearing box 24, and the rotating shaft 2. The sliding part deterioration detecting tube 40 is connected to the bearing housing 24 of the underwater bearing 20 including the grease supplying means 30 for releasing the grease pressure of the grease moved through the bearing housing 24 to the atmosphere.

The underwater bearing 20 is attached to the sewer as described above, and pivotally supports the lower end of the rotating shaft 2 of the rotating device. The underwater bearing 20 of the present embodiment can be applied to a rotary device including the rotary shaft 2 such as a screw pump, a vertical pump, a flocculator, a screw conveyor, and a sludge scraper. The underwater bearing 20 has a bearing box 24, a bearing metal 26, and a seal portion 28 as main basic configurations.

The bearing box 24 is a substantially concave case having an insertion port 22 at the lower end of the rotary shaft 2. The bearing box 24 is attached to a connecting portion between the sewer channel and the inclined channel. Inside the bearing box 24, a bearing metal 26 that is in surface contact with the rotary shaft 2 provided with a sleeve serving as a rotary sliding portion is disposed. The bearing metal 26 is a cylindrical sliding bearing having an inner diameter slightly larger than the outer diameter of the sleeve. FIG. 2 is a sectional view of the bearing box. As shown in the figure, a groove 50 is formed on the inner surface of the bearing metal 26 that is in surface contact with the sleeve 25. The groove 50 is formed at a predetermined depth in the vertical, horizontal, cross, or spiral shape along the outer periphery of the rotating shaft 2 from the closing surface 23 opposite to the insertion port 22 of the bearing housing 24 toward the insertion port 22. ing. The groove 50 having such a configuration can uniformly move the gap between the sleeve and the bearing metal 26 by directing the grease supplied from the lower end of the bearing box 24 toward the insertion port 22.

The seal portion 28 closes the gap between the insertion port 22 and the outer periphery of the rotating shaft 2 to prevent the solid matter such as water, sand and mud from entering the bearing box 24. Conventionally, a rubber seal, a metal touch seal, or the like is applied to the seal portion 28, and it was expected to leak a little grease from this portion, but in this embodiment, an oil seal having a strong sealing property is used. The sealing portion 28 of the present embodiment has adjusted the tightening force so that a small amount of grease that has moved in the bearing housing 24 can be released into the water. This time, because the grease is released outside the bearing, the frictional heat generated by the rotation of the rotary shaft 2 is released to the outside of the bearing housing 24 along with the movement of the grease. It is possible to prevent the sleeve and the bearing metal 26 from expanding and burning the rotary sliding portion.

The grease supply means 30 includes a greasing supply pipe 32 connected to the closing surface 23 of the bearing box 24 and a greasing pump 34 attached to the greasing supply pipe 32. The greasing pump 34 is connected to the grease tank and disposed on the land. The greasing supply pipe 32 is arranged so as to be routed from the onshore greasing pump 34 to the underwater bearing box 24. The grease supply means 30 supplies grease to the inside of the bearing box 24 via a grease supply pipe 32. The grease supply means 30 supplies grease having a lower fluidity than the machine oil into the bearing housing 24 at a predetermined pressure by a grease pump 34. Here, the predetermined pressure in the present embodiment refers to the pipe loss of the grease supply pipe 32 on the discharge side of the grease pump 34, the pipe loss in the bearing box 24, the pipe loss of the seal portion 28, the loss of the seal portion 28, This means all pressure heads taking into account the pipe pressure loss in the sliding part deterioration detection tube 40, the head pressure difference between the grease surface of the sliding part deterioration detection pipe 40 outlet and the grease tank surface on the greasing pump 34 side. ing.

The sliding portion deterioration detection tube 40 is a pipe having one end connected to the upper end of the farthest bearing box 24 from the greasing supply port of the blocking surface 23 and the other end opened on land. The sliding portion deterioration detection tube 40 is arranged so as to be routed from the underwater bearing box 24 to the opening at the other end. The sliding portion deterioration detection tube 40 having such a configuration can discharge grease that has moved in the bearing housing 24 to the land, in other words, to the atmosphere. When the internal pressure of the bearing housing 24 is larger than the underwater pressure, the sliding part deterioration detection tube 40 having such a configuration discharges the grease that has moved through the bearing housing 24. However, when the seal portion 28 deteriorates, the internal pressure of the bearing housing 24 cannot be maintained, and the grease is not discharged. Thereby, deterioration of the seal part 28 can be predicted.

Further, the sliding portion deterioration detection tube 40 has one or more branch pipes (in FIG. 1, three pipes, a first branch pipe 44, a second branch pipe 46, and a third branch pipe 48) on the other end side of the main pipe 42. Is connected. A first on-off valve 45, a second on-off valve 47, and a third on-off valve 49 are attached to the first to third branch pipes 44, 46, and 48, respectively. The main pipe 42 of the sliding portion deterioration detection pipe 40 is disposed at a position higher than the opening of the branch pipe from the water surface, and the openings of the first to third branch pipes 44, 46, 48 are formed on the main pipe 42. They are arranged at a predetermined interval so as to be below the opening. The openings of the first to third branch pipes 44, 46, and 48 are arranged so that their positions from the water surface are different.

Further, the sliding portion deterioration detection tube 40 has a diameter of a connection port with the bearing housing 24 set to be equal to or larger than a diameter of the greasing supply tube 32. As a result, the pressure loss of the piping can be reduced, so that the grease discharge pipe port can be raised to the land and discharged into the atmosphere. In addition, by grading the height of the grease discharge surface, it is possible to numerically represent the aging deterioration of the underwater bearing from the moisture mixed into the grease.

The sliding portion deterioration detection tube 40 is connected to the uppermost end of the groove 50 of the bearing metal 26. With such a configuration, the grease supplied to the bearing housing 24 is facilitated to be discharged, and the deterioration of the underwater bearing 20 over time can be easily detected due to the state of the grease and the entry of moisture or the like due to deterioration or damage of the seal portion 28. Can be measured.

FIG. 3 is an explanatory diagram showing a schematic configuration of a modified example of the sliding portion deterioration detection tube. As the sliding portion deterioration detection tube 40 of the modified example, at least a part of the tube in the atmosphere that is not submerged can be used, or a transparent pipe in which the inside of the tube can be visually observed or a transparent hose that can easily change the discharge height of the grease is used. it can. With such a configuration, the grease discharged from the bearing box 24, moisture mixed in the grease, etc. can be easily confirmed by visual inspection before being discharged from the pipe, in other words, even while passing through the pipe. Therefore, it is possible to easily determine aged deterioration of the underwater bearing 20.
Furthermore, the bearing box 24 is provided with a scale plate 51 that extends in the vertical direction from the connecting portion of the underwater sliding portion deterioration detection tube 40 to the atmosphere. A scale is engraved on the scale plate 51 from the connecting portion of the underwater sliding portion deterioration detection tube 40, and the height from the connecting portion can be measured in the atmosphere. The sliding portion deterioration detection tube 40 is arranged on the scale plate 51, and the position of the grease filled in the transparent tube can be measured.
Next, the relationship between the atmospheric pressure and the grease pressure during grease filling will be described below. As shown in FIG.
Pa: Grease pressure in the underwater bearing,
Pb: atmospheric pressure,
Pc: grease pump pressure,
Ph1: Difference between the connection position of the grease tank and the sliding part deterioration detection tube 40 of the underwater bearing (grease column pressure),
Ph2: difference between the open end portion of the sliding portion deterioration detection tube and the connection position of the underwater bearing (pressure of the grease column 52),
ΔP _α : Primary loss (pressure loss, gap loss, etc.) of the pressure Pa measurement part in the underwater bearing,
ΔP _β : secondary loss (piping etc.) of the pressure Pa measuring part in the underwater bearing,
ΔP _γ : Loss of grease discharged from the gap of the seal part.
The primary pressure balance A of the pressure Pa is
Pa = Pb + Pc + Ph1-ΔP _α (Equation 1)
It becomes.
The secondary pressure balance B of the pressure Pa is
Pa-ΔP _γ = Pb + Ph2-ΔP _β
Ph2 = Pa−Pb−ΔP _γ + ΔP _β (formula 2)
It becomes.
Ph2 (secondary grease column 52) is a scale plate 51 extending in the vertical direction from the connecting portion of the underwater sliding portion deterioration detection tube 40 to the atmosphere, and the vertical height of the grease in the detection tube is known. Therefore, the sliding portion deterioration detection tube 40 of the present embodiment can be expressed as a grease manometer.
In addition, a scale can be formed on the surface of the transparent pipe of the sliding portion deterioration detection tube 40, the height of the grease can be measured, and the degree of wear can be expressed as an index.

The operation of the sliding part deterioration detection system 10 of the underwater bearing of the present invention having the above-described configuration will be described below. In operation of the rotating device, in the underwater bearing 20, the rotating shaft 2 provided with the sleeve is pivotally supported in surface contact with the bearing metal 26 in the bearing housing 24 and rotates at a predetermined rotational speed. At this time, grease is supplied into the bearing housing 24 by the grease supply means 30. The grease is supplied at a predetermined pressure by the greasing pump 34. Then, the grease introduced from the lower end of the bearing box 24 moves along the groove 50 formed in the bearing metal 26 through the gap between the sleeve and the bearing metal 26. The groove 50 is formed in the bearing metal 26 along the outer periphery of the rotary shaft 2 and is formed from the closing surface 23 of the bearing housing 24 toward the insertion port 22. For this reason, the grease supplied into the bearing housing 24 can be uniformly moved through the gap between the sleeve and the bearing metal 26. The grease that has moved to the upper end of the bearing housing 24 is discharged to the outside through the sliding portion deterioration detection tube 40 because the insertion port 22 of the bearing housing 24 is blocked by the seal portion 28. Note that the seal portion 28 is a portion that is in contact with the rotating shaft 2 while rotating, and some leakage of grease into the water occurs. As for the grease discharged to the outside through the sliding portion deterioration detection tube 40, only the grease is discharged at the initial stage of operation. And when predetermined operation time passes, wear of seal part 28 advances. Then, the seal portion 28 deteriorates due to wear due to the state of grease and solid matter such as sand and mud mixed with the grease, and water enters the bearing housing 24 from the seal portion 28 and slides deterioration detection tube 40. Further, when the seal portion 28 is worn out, the grease leaks from the seal portion 28 into the underwater portion, so that the grease does not flow into the sliding portion deterioration detection tube 40. In this way, deterioration of the seal portion 28 can be detected.

Further, when the first to third branch pipes 44, 46, 48 are disposed at the other end of the sliding portion deterioration detection pipe 40, the grease supply pressure in the bearing housing 24 is set to ΔP 0, and the first on-off valve 45 is reached. The pressure loss of the pipe is ΔP1, the pressure loss of the pipe to the second on-off valve 47 is ΔP2, the pressure loss of the pipe to the third on-off valve 49 is ΔP3, and the pressure loss of the main pipe 42 is ΔP4. Then, the pressure loss ΔP4 of the main pipe 42 is set to satisfy ΔP0 ≧ ΔP4. When the oil supply pump 34 is activated and the grease supply pressure in the bearing housing 24 increases and becomes ΔP4 or more, the grease is discharged from the main pipe 42 (ΔP4). The first to third on-off valves 45, 47, and 49 are closed. When ΔP0 ≦ ΔP4, the grease is not discharged from the main pipe 42, and the third on-off valve 49 below is opened to check the condition of grease discharge. Further, when the grease is no longer discharged from the third on-off valve 49, the second on-off valve 47 below is opened to check the grease discharge condition. Repeat this operation to check the grease discharge. If the discharged grease contains moisture or the like, it can be determined that the wear of the seal portion 28 has progressed or the wear of the rotary sliding portion has progressed. Eventually, when grease, moisture, or the like is no longer discharged from the lowermost first on-off valve 45, it is determined that the wear of the seal portion 28 and the rotary sliding portion has progressed violently and the grease has been discharged into the water. be able to. Accordingly, it can be determined that it is time to repair and maintain the underwater bearing 20.
Further, the bearing box 24 may be provided with a scale plate 51 extending in the vertical direction from the connecting portion of the underwater sliding portion deterioration detection tube 40 to the atmosphere. By arranging the sliding portion deterioration detection tube 40 on the scale plate 51 and measuring the position of the grease filled in the transparent tube, it can function as a manometer.

According to such a sliding part deterioration detection system for an underwater bearing of the present invention, grease that has been discharged into the water and could not be visually observed can be visually checked.・ It is possible to easily detect the deterioration of aged bearings due to water and foreign matter due to damage.

The present invention can be widely applied particularly to a bearing of a rotating device such as a screw pump disposed in water.

DESCRIPTION OF SYMBOLS 1 ......... Screw pump, 2 ......... Rotating shaft, 3 ......... Emperor, 4 ......... Upper bearing, 5 ...... Underwater bearing, 6 ......... Drive means, 8 ......... Greasing supply pipe, 9 ......... Rubber seal, 10 ......... Sliding part deterioration detection system for underwater bearing, 20 ......... Underwater bearing, 22 ......... Insertion port, 23 ......... Closed surface, 24 ......... Bearing box, 25 ... ...... Sleeve, 26 ......... Bearing metal, 28 ......... Seal part, 30 ......... Grease supply means, 32 ...... Greasing supply pipe, 34 ......... Greasing pump, 40 ......... Sliding part Deterioration detection pipe, 42 ... Main pipe, 44 ... First branch pipe, 45 ... First open / close valve, 46 ... Second branch pipe, 47 ... Second open / close valve, 48 ... ... 3rd branch pipe, 49 ......... 3rd on-off valve, 50 ......... Groove, 51 ......... Scale plate, 52 ...... Grease column.

Claims

Connected to the bearing housing of a submersible bearing comprising a bearing housing that pivotally supports the rotating shaft in water, and a grease supply means that is connected to the bearing housing and supplies grease at a predetermined pressure to a gap between the rotating shaft, A sliding part deterioration detection system for an underwater bearing, comprising a sliding part deterioration detection pipe that releases the grease pressure of the grease that has moved the bearing box to the atmosphere.
The grease supply means includes a grease supply pipe connected to the bearing box, and the sliding portion deterioration detection pipe has a diameter of a connection port with the bearing box equal to or larger than a diameter of the grease supply pipe. The sliding part deterioration detection system for an underwater bearing according to claim 1, wherein
The bearing metal formed on the sliding surface of the bearing box and the rotating shaft has a groove formed along the outer periphery of the rotating shaft, and the sliding port deterioration detection tube and the connection port of the bearing box are connected to the groove. The sliding part deterioration detection system for an underwater bearing according to claim 1 or 2, wherein the system is made to coincide with the upper end portion.
4. The sliding part deterioration detection pipe is a transparent pipe that allows the inside of the pipe to be visually observed, or a transparent hose that can easily change the discharge height of grease. The sliding part deterioration detection system for underwater bearings described in 1.
5. The underwater bearing sliding portion deterioration detection system according to claim 4, wherein the bearing box is provided with a scale plate extending vertically from the connection portion of the underwater sliding portion deterioration detection tube to the atmosphere. .
4. The sliding part deterioration detection pipe is formed with an on-off valve in a branch pipe branched from one or more main pipes, and the plurality of branch pipes have different height positions from the water surface. The sliding part deterioration detection system of the underwater bearing of any one of these.