Bearing housing, bearing clearance measuring jig

Abstract

To provide a clearance measurement window for a bearing box that can easily measure the clearance of a rotating sliding part of an underwater or land bearing in a short time. [Solution] The clearance measurement window 10 of the bearing housing of the present invention is characterized in that a closing cover 23 of the bearing housing 24 that supports the lower shaft 22 of the bearing is provided with an insertion hole 11 into which a clearance gauge 14 can be inserted at a location opposite the gap between the lower shaft 22 or the sleeve 25 of the lower shaft 22 and the bearing metal 26 of the bearing housing 24, and a cap 12 that covers the insertion hole 11.

Description

[Technical Field]

[0001] The present invention is a method for measuring the clearance of the rotating sliding parts of submerged bearings and land bearings attached to rotating equipment such as screw pumps, land screw conveyors, land mixers, washing machines, etc. Bearing housing This relates to a bearing clearance measuring jig. [Background technology]

[0002] Figure 5 is a schematic diagram showing the overall configuration of a screw pump. Screw pump 1 is composed of a rotating shaft (also called a runner) 2, which is an integrated unit consisting of an upper shaft, blades (also called an impeller), and a submerged shaft, a mortar casing 7, an upper bearing 4, a submerged bearing 5, and a drive means 6. Screw pump 1 is installed in an inclined waterway connecting an upper waterway and a sewerage channel. With this configuration, screw pump 1 can rotate the impeller 3 on the rotating shaft (runner) 2 using the drive means 6, pumping water from the sewerage channel and sending it to the upper waterway. Screw pump 1 is used to pump and transport rainwater, seawater, sewage, sediment, sediment, pharmaceuticals, food, etc.

[0003] The rotating sliding parts of the upper bearing 4 and the submerged bearing 5 wear out as the rotating equipment operates for extended periods of time. In particular, the submerged bearing 5 supports the rotating shaft 2 of large rotating equipment used in sewage treatment plants and water purification plants underwater. When sewage and fine solid matter such as sand and mud mixed in the water get into the rotating sliding parts of the bearing, the sanding effect accelerates wear of the sliding parts. For this reason, to prevent sewage and solid matter from getting into the rotating sliding parts, the parts where the submerged bearing and the rotating shaft 2 slide are filled with oil, and an oil seal is installed to prevent the oil from leaking from the sliding parts.

[0004] The bearing housing that supports the rotating shaft 2 underwater is equipped with a lubricating oil supply unit (disclosed in Patent Document 1). The lubricating oil from the lubricating oil supply unit moves through the rotating sliding parts, reducing wear and frictional heat generated by rotation in the rotating sliding parts and preventing problems such as seizure of the rotating sliding parts. The lubricating oil inside the submerged bearing also serves to stop water and fine sand from penetrating the oil seal.

[0005] As mentioned above, the lubricant supplied to the rotating and sliding parts resides in the gap between the sleeve of the lower shaft (or the rotating shaft if there is no sleeve) and the bearing metal of the bearing housing. This gap increases as the rotational speed increases. When the rotating and sliding parts are metal-to-metal, the gap can start at 0.1 mm and fluctuate to 1.25 mm or more, necessitating periodic gap measurement. Gap measurement is performed by inserting a feeler gauge (several dozen gauges with thicknesses ranging from 0.05 mm to 2.5 mm) into the gap. However, each time a gap measurement is performed, the closing lid of the bearing housing, which seals in the lubricant, must be removed, causing a large amount of lubricant to leak out of the bearing housing. After the measurement is completed and the closing lid is replaced, lubricant must be injected until the air pockets (air pockets) inside the bearing housing disappear. This work must be performed quickly in a narrow, dark space similar to an underwater waterway. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5869127 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide a method for easily measuring the clearance of the rotating sliding part of an underwater or land bearing in a short time in consideration of the problems of the above-mentioned prior art. Bearing housing The present invention aims to provide a bearing clearance measuring jig. [Means for solving the problem]

[0008] As a first means for solving the above problems, the present invention provides: A bearing box that receives a cylindrical lower shaft of a rotating shaft, the bottom of which is closed with a closing lid, an oil seal holder is provided around the upper part of the lower shaft, and a cylindrical bearing metal is disposed inside that has an inner diameter larger than the outer diameter of the lower shaft or the sleeve of the lower shaft and that comes into surface contact with the lower shaft or the sleeve of the lower shaft, and the closing lid the lower shaft or the sleeve of the lower shaft; The aforementioned The bearing metal has an insertion hole in which a gap gauge can be inserted at a location opposite the gap, and a cap that closes the insertion hole. Bearing housing The purpose is to provide According to the first method, the clearance measurement of the rotary sliding part can be performed easily in a short time. In addition, there is no need to spill a large amount of lubricating oil or grease, and there is no need to waste time on the subsequent disposal.

[0009] As a second means for solving the above problem, the present invention provides a method for measuring a clearance from a clearance measurement window provided in a closing cover of a bearing housing of a bearing. Rotation axis The lower shaft sleeve and The aforementioned a gap gauge of a predetermined thickness to be inserted into a gap in the bearing metal of the bearing housing; Insert into the gap measurement window do Installed between the gap gauge and the inner periphery of the gap measurement window, The upper surface is formed into an arc shape with a radius r of the lower shaft. Supporting the gap gauge along the longitudinal direction of the gap gauge and transform it into an arc To provide a bearing clearance measuring jig equipped with a gauge guide. According to the second means, the thin thickness gauge can be easily inserted without bending over the distance of several centimeters from the inside of the blocking cover to the gap between the bearing metal and the sleeve. [Effects of the Invention]

[0010] According to the present invention, clearance measurement of a rotary sliding part can be performed easily in a short time. In addition, there is no need to spill a large amount of lubricating oil or grease, and there is no need to waste time on subsequent disposal. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a front view of a clearance measurement window of the bearing housing of the present invention. [Figure 2] FIG. 2 is an enlarged cross-sectional view of the bearing housing as seen from the side. [Figure 3] FIG. 4 is an explanatory diagram of a clearance measurement window of a bearing housing and a bearing clearance measurement jig. [Figure 4] FIG. 10 is an explanatory diagram of a gauge guide. [Figure 5] FIG. 1 is a schematic diagram showing the overall configuration of a conventional screw pump. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention Bearing housing An embodiment of the bearing clearance measuring jig of the present invention will be described in detail below with reference to the drawings. Bearing housing The bearing clearance measuring jig is applicable to the rotating sliding parts of submersible bearings and land bearings attached to rotating equipment such as screw pumps, land screw conveyors, land agitators, and washing machines.

[0013] [Bearing housing clearance measurement window 10] FIG. 1 is a front view of a clearance measurement window of a bearing housing of the present invention. FIG. 2 is an enlarged cross-sectional view of the bearing housing as seen from the side. Note that only the lower shaft 22 in FIG. 2 is shown in a projected view, and the others are shown in cross-section. FIG. 3 is an explanatory diagram of a clearance measurement window 10 of a bearing housing and a bearing clearance measurement jig. As shown in the figure, the clearance measurement window 10 of a bearing housing of the present invention (hereinafter sometimes simply referred to as the clearance measurement window) comprises a closing cover 23 of a bearing housing 24 that supports the lower shaft 22 of a submersible bearing 20 underwater, an insertion hole 11 into which a gap gauge 14 can be inserted at a location facing the gap between the lower shaft 22 or the sleeve 25 of the lower shaft 22 (the sleeve 25 of the lower shaft 22 is integrated by shrink fitting) and the bearing metal 26 of the bearing housing 24, and a cap 12 that covers the insertion hole 11 (see FIGS. 1 and 2).

[0014] The submersible bearing (hereinafter sometimes simply referred to as the bearing) 20 is attached to a sewerage channel and supports the lower end of the rotating shaft 2 of the rotating equipment. The submersible bearing 20 of this embodiment can be applied to rotating equipment equipped with a rotating shaft 2, bearing, and sprocket, such as a screw pump, flocculator, grit collector, sedimentation tank screw conveyor, or sludge collector. In addition, the submersible bearing can be applied to rotating equipment such as a land-based screw conveyor, a land-based mixer, or a washing machine. The submersible bearing 20 is basically composed of a bearing housing 24, a bearing metal 26, and an oil seal 28.

[0015] The bearing box 24 is a cylindrical case that supports the lower shaft 22 of the rotating shaft 2 and is fixed to the bearing base 21 using assembly bolts. The bearing box 24 is attached to the connection between the sewer channel and the inclined waterway. The bottom of the bearing box 24 is closed by a closing lid 23, and an oil seal retainer 27 is provided around the lower shaft 22 above. Inside the bearing box 24, a bearing metal 26 is disposed, which comes into surface contact with the rotating shaft 2 and is equipped with a sleeve 25 that serves as the rotating sliding part. The bearing metal 26 is a cylindrical sliding bearing with an inner diameter slightly larger than the outer diameter of the sleeve 25. A groove (grease supply groove) 50 is formed on the inner surface of the bearing metal 26, which comes into surface contact with the sleeve 25. The configuration of this groove 50 allows lubricating oil supplied from the lower end of the bearing box 24 to be evenly distributed throughout the gap between the sleeve 25 and the bearing metal 26. In a structure where a metal is not attached to the shaft, the shaft and the bearing metal form the sliding part.

[0016] The lubricating oil supply unit 30 is composed of a grease supply pipe 32 connected to the blocking lid 23 of the bearing housing 24, and a grease pump 34 attached to the grease supply pipe 32. Note that the lubricating oil sealed type does not have a lubricating oil supply pipe. The grease pump 34 is connected to a lubricating oil tank and installed on land. The grease supply pipe 32 is installed so as to run from the grease pump 34 on land to the bearing housing 24 underwater. The lubricating oil supply unit 30 supplies lubricating oil to the inside of the bearing housing 24 via the grease supply pipe 32. The lubricating oil supply unit 30 uses the grease pump 34 to supply lubricating oil (such as grease) which has lower fluidity than machine oil into the bearing housing 24 at a predetermined pressure.

[0017] A clearance measurement window 10 is provided in the closing cover 23 of the bearing housing 24. The gap between the lower shaft 22 and the bearing metal 26 is formed concentrically from the center of the lower shaft 22 (see arrow A in Figure 1). A plurality of clearance measurement windows 10 are provided in the closing cover 23 facing this concentric circle. In this embodiment, as an example, insertion holes 11 into which clearance gauges 14 can be inserted are drilled in four locations: the top, left, right, and bottom. The insertion hole 11 is threaded and a cap 12 is screwed onto it. As examples of the cap 12, a square plug, a hexagon socket set screw, or a fastening bolt can be used. When the screw pump is in operation, the insertion hole 11 is closed with the cap 12 to prevent leakage of lubricating oil from the bearing housing 23. When measuring the clearance of the rotating sliding part, the cap 12 is removed from the insertion hole 11.

[0018] [Bearing clearance measurement jig 13] The bearing clearance measuring jig 13 of the present invention comprises a gap gauge 14 of a predetermined thickness which is inserted from a gap measurement window 10 provided in the blocking cover 23 of the bearing housing 24 of the underwater bearing 20 to the sleeve 25 of the lower shaft 22 of the underwater bearing 20 and into the gap between the bearing metal 26 of the bearing housing 24 of the underwater bearing 20, and a gauge guide 15 which is positioned between the gap gauge inserted into the gap measurement window 10 and the inner circumference of the gap measurement window 10 and supports the gap gauge 14 along the longitudinal direction of the gap gauge 14.

[0019] The gap gauge 14 is a thin, elongated flat plate of a predetermined thickness (for example, 5 to 10 mm wide and 300 mm long). The gap gauge 14 is prepared in a dozen thicknesses, each ranging from 0.05 mm to 2.5 mm. FIG. 4 is an explanatory diagram of the gauge guide. The gauge guide 15 is a rod-shaped member with a semicircular cross section that follows the inner periphery of the insertion hole 11. The gauge guide 15 is composed of a small-diameter portion 15a that fits into the insertion hole 11 and an expanded-diameter portion 15b that is larger than the insertion hole 11. The small-diameter portion 15a is set to a length shorter than the length from the outside of the block lid 23 to the lower shaft 22 or the bearing metal 25. The upper surface of the gauge guide 15 is formed in an arc shape (with radius r of the lower shaft 22) that follows the circumferential gap (between the sleeve 25 of the lower shaft 22 of the underwater bearing 20 and the bearing metal 26 of the bearing housing 24 of the underwater bearing 20). The tip (small-diameter portion 15a) of the gauge guide 15 is aligned with the inner periphery of the insertion hole 11, and the gap gauge 14 is placed on the gauge guide 15. By holding the gap gauge 14 on the arc-shaped gauge guide 15 along the longitudinal direction of the gauge guide 15 (the thin gap gauge 14 is deformed into an arc), the gap gauge 14 can be inserted into the gap between the sleeve 25 of the lower shaft 22 and the bearing metal 26.

[0020] [Method for measuring clearance between rotating and sliding parts] A method for measuring the clearance of a rotary sliding portion using the above configuration will now be described. To measure the clearance of the rotating sliding part, remove the cap 12 from the clearance measurement window 10. Lubricating oil flows out of the insertion hole 11. Place the tip of the gauge guide 15 along the inner circumference of the insertion hole 11 and align the top surface of the guide according to the position of the insertion hole 11 (top, left, right, or ground). Place the gap gauge 14 on the gauge guide 15 and, while holding the gap gauge 14 on the arc-shaped gauge guide 15 along its length (the thin gap gauge 14 deforms into an arc), move the gap gauge 14 to insert it into the gap between the lower shaft 22 and the bearing metal 26. For example, the initial measurement values ​​for the rotating sliding part are 0.3 mm for the top, 0.15 mm for the left, 0.15 mm for the right, and 0.0 mm for the ground. Select a gap gauge 14 that corresponds to these settings, or insert multiple gauges in a stack. The measured gap value will fluctuate over time. According to the present invention, the clearance measurement of the rotating sliding part can be performed easily in a short time. In addition, the thin thickness gauge can be easily inserted from the inside of the closing cover to the bearing metal and sleeve over a distance of several centimeters without bending.

[0021] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made without departing from the spirit and scope of the present invention. Furthermore, the present invention is not limited to the combinations shown in the embodiments, but can be implemented in various combinations. [Explanation of symbols]

[0022] 1 screw pump 2 rotation axes 3 impeller 4 Upper bearing 5. Underwater bearings 6. Driving means 7 Mortar Casing 10 Bearing housing clearance measurement window 11 Insertion hole 12 Caps 13 Bearing clearance measuring jig 14 Feeler gauge 15 Gauge Guide 15a Small diameter section 15b Large diameter part 20 Underwater bearings 21 Bearing stand 22 Lower shaft 23 Occlusion lid 24 Bearing box 25 sleeve 26 Bearing metal 27 Oil seal retainer 28 Oil seal 30 Lubricating oil supply section 32 Grease supply piping 34 Grease pump 50 groove (grease supply groove)

Claims

1. A bearing box that receives the lower shaft of a rotating shaft in a cylindrical shape, the bottom surface of which is closed with a closing lid, an oil seal holder is provided around the lower shaft above, and a cylindrical bearing metal is disposed inside that has an inner diameter larger than the outer diameter of the lower shaft or the sleeve of the lower shaft and is in surface contact with the lower shaft or the sleeve of the lower shaft, and the closing lid is provided with an insertion hole into which a gap gauge can be inserted at a location opposite the gap between the lower shaft or the sleeve of the lower shaft and the bearing metal, and a cap that closes the insertion hole.

2. a gap gauge of a predetermined thickness that is inserted into a gap between a sleeve of a lower shaft of a rotating shaft and a bearing metal of a bearing housing of the bearing through a gap measurement window provided in a closing cover of the bearing housing of the bearing; A bearing clearance measurement jig characterized by comprising a gauge guide that is installed between the gap gauge inserted into the gap measurement window and the inner circumference of the gap measurement window, has an upper surface formed into an arc shape with a radius r of the lower axis, and supports the gap gauge along the longitudinal direction of the gap gauge and deforms it into an arc.

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