Pump

Abstract

To determine abnormality of a bearing applied to a pump with a simple constitution.SOLUTION: A pump 1 comprises: a casing 2; a main shaft 3 extending in the casing 2 and having an impeller 20 fixed thereto; a bearing 41 supported by the casing 2 and supporting the main shaft 3 rotatably; a sleeve 46 fitted onto the main shaft 3 so as to rotate integrally with the main shaft 3, and brought into slide contact with an inner peripheral surface of the bearing 41; identification members 50, 60 installed on surfaces 41a, 46a, directed in an axial direction, out of a surface of the bearing 41 and / or a surface of a sleeve 46 as an object of wear monitoring, and wearing off equally to the object of wear monitoring as the main shaft 3 rotates; and a passage 4a for introducing an imaging device 80 into the casing 2 so as to image surfaces of the identification members 50, 60.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a pump. [Background technology]

[0002] Patent Document 1 discloses a bearing diagnostic device applied to a vertical pump. The bearing diagnostic device determines the wear, damage and other abnormalities of the bearing based on the detection results of a pressure gauge and an air flow meter, taking into consideration the correlation between the clearance between the bearing and the main shaft and the pressure drop time and flow rate of the compressed air supplied to the bearing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-074530 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned bearing diagnostic device, the system configuration is complicated in terms of both hardware and software.

[0005] An object of the present invention is to make it possible to determine abnormality in a bearing applied to a pump using a simple configuration. [Means for solving the problem]

[0006] One aspect of the present invention provides a pump comprising: a casing, a main shaft extending within the casing and having an impeller fixed thereto, a bearing supported by the casing and rotatably supporting the main shaft, a sleeve fitted onto the main shaft so as to rotate integrally with the main shaft and in sliding contact with an inner surface of the bearing, an identification member that is installed on an axially oriented surface of the surface of the bearing and / or the sleeve as a wear monitoring target and that wears in the same manner as the wear monitoring target as the main shaft rotates, and a passage for introducing an imaging device into the casing to image the surface of the identification member.

[0007] According to the above configuration, workers involved in the maintenance of the pump can easily check the degree of wear of the identification member by visually checking the imaged results of the surface of the identification member displayed on the display device. The identification member wears in the radial direction in the same manner as the wear monitoring object. Therefore, the degree of wear of the wear monitoring object can be accurately determined from the degree of wear of the identification member. Such a determination is achieved by placing the identification member on the surface of the wear monitoring object and providing a passageway to enable the image of the surface of the identification member. The device for determining the wear of the wear monitoring object can be simplified.

[0008] At least the surface of the identification member may be colored in different colors on the inner peripheral side and the outer peripheral side in the radial direction.

[0009] According to the above configuration, it is easy to determine the degree of wear of the identification member based on the image capturing result, which in turn makes it easy to determine the degree of wear of the object to be monitored for wear.

[0010] The surface of the identification member may be an inclined surface inclined relative to the radial direction.

[0011] According to the above configuration, the apparent amount of wear in the image capture is greater than the actual amount of wear, making it easier to determine the degree of wear of the identification member, and therefore of the object to be monitored for wear, based on the image capture.

[0012] The identification member may have a hardness equal to or smaller than that of the object to be monitored for wear.

[0013] According to the above configuration, it is possible to make the identification member wear in the same manner as the object to be monitored for wear. Effect of the Invention

[0014] According to the present invention, an abnormality in a bearing applied to a pump can be determined with a simple configuration. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a cross-sectional view of a pump according to the embodiment. [Diagram 2] Enlarged view of Figure 1 [Diagram 3] Enlarged view of Fig. 2 [Figure 4] FIG. 4 is a perspective view of a first identification member for a bearing. [Diagram 5] FIG. 4 is a perspective view of a second identification member for the sleeve. [Figure 6] Equivalent to Fig. 3 in a worn state. [Figure 7] FIG. 11 is a diagram showing an example of an imaging result in an initial state. [Figure 8] FIG. 7 corresponds to the worn state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment will be described with reference to the drawings. Note that the same or corresponding elements are designated by the same reference numerals, and detailed description thereof will be omitted.

[0017] 1, a pump 1 according to an embodiment is installed in a pumping station, such as a drainage pumping station or a pumping station, that is equipped with a water tank 90. ​​The pump 1 is, for example, a vertical pump, and includes a casing 2, a main shaft 3, and an introduction section 4.

[0018] The casing 2 is generally tubular and open at both ends. The casing 2 comprises a plurality of casing members including a trumpet pipe 11, an impeller casing 12, a lift pipe 13, and a discharge elbow pipe 14, which are connected in this order from below. The upper end flange of the lift pipe 13 is fixed to an installation floor 91 that closes a water tank 90 from above. The lift pipe 13 and the casing members connected below it are suspended from the installation floor 91 and placed in the water tank 90. ​​One end of the discharge elbow pipe 14 is fastened to the upper end flange of the lift pipe 13, and the discharge elbow pipe 14 is placed above the water tank 90. ​​The lower end opening of the trumpet pipe 11 is the suction port 2a of the casing 2, and the other end opening of the discharge elbow pipe 14 is the discharge port 2b of the casing 2.

[0019] The main shaft 3 extends vertically within the casing 2. The central axis of the casing 2 extends vertically from the trumpet pipe 11 to the lifting pipe 13 and curves within the discharge elbow pipe 14, while the axis of the main shaft 3 extends linearly from below. The upper end of the main shaft 3 penetrates the wall of the discharge elbow pipe 14 and is connected to an actuator (not shown) outside the casing 2. The impeller 20 is fixed to the lower end of the main shaft 3 and is housed in the lower part of the impeller casing 12.

[0020] When the actuator is activated, the main shaft 3 is rotated together with the impeller 3a. As a result, water in the water tank 90 is sucked into the casing 2 through the suction port 2a, flows upward through the casing 2, and is discharged from the casing 2 through the discharge port 2b. A drain pipe (not shown) provided at the plant is connected to the discharge port 2b.

[0021] The casing member further includes a lower bearing casing 15 disposed in the impeller casing 12 and an upper bearing casing 16 disposed in the lift pipe 13. The lower bearing casing 15 and the upper bearing casing 16 are formed in a cylindrical shape and surround the main shaft 3. The outer peripheral surface of the lower bearing casing 15 is connected to the inner peripheral surface of the impeller casing 12 via a rib 18 extending in the radial direction. The outer peripheral surface of the upper bearing casing 16 is connected to the inner peripheral surface of the lift pipe 13 via a rib 19 extending in the radial direction.

[0022] The main shaft 3 is rotatably supported by a plurality of bearings arranged at intervals in the vertical direction. The plurality of bearings includes two bearings 31 and 41 housed in the casing 2.

[0023] Bearing 31 is held in lower bearing casing 15 and supported by casing 2 via lower bearing casing 15. Bearing 41 is held in upper bearing casing 16 and supported by casing 2 via upper bearing casing 16. Both bearings 31, 41 are located below installation floor 91 and housed in the bearing casing, making it difficult to check for abnormalities such as wear. An imaging device 80 (see FIG. 2) is used to monitor wear.

[0024] The introduction portion 4 forms a passage 4a for introducing the imaging device 80 into the lower bearing casing 15 and the upper bearing casing 16. The introduction portion 4 and the passage 4a are constituted by a pipe or a through hole formed in a casing member.

[0025] One end of the introduction section 4 is located above the installation floor 91. The introduction section 4 includes a common section 4b that penetrates the installation floor 91 and extends inside the water tank 90, and two branch sections 4c, 4d that branch off from the common section 4b and extend from the outer circumferential surface of the casing 2 toward the center. The tips of the branch sections 4c, 4d are the other end of the introduction section 4. The common section 4b is disposed outside the casing 2.

[0026] One branch portion 4c penetrates the impeller casing 12, extends radially toward the center inside the impeller casing 12, and penetrates the lower bearing casing 15. The tip of one branch portion 4c opens toward the inside of the lower bearing casing 15 in which the bearing 31 is arranged. The other branch portion 4d penetrates the lift pipe 13, extends radially toward the center inside the lift pipe 13, and penetrates the upper bearing casing 16. The tip of the other branch portion 4d opens toward the inside of the upper bearing casing 16 in which the bearing 41 is arranged.

[0027] With reference to FIG. 2, the pump 1 further includes a bearing holder 42, a sleeve 46, a first identification member 50, and a second identification member 60.

[0028] The upper end opening edge of the upper bearing casing 16 is radially spaced from the outer circumferential surface of the main shaft 3. The bearing holder 42 is cylindrical, and is fitted into the upper end of the upper bearing casing 16. The bearing holder 42 has an outer flange 42a that protrudes toward the outer circumferential side at one end, and an inner flange 42b that protrudes toward the inner circumferential side at the other end. The outer circumferential surface of the bearing holder 42 is in close contact with the inner circumferential surface of the upper bearing casing 16, the outer flange 42a abuts against the upper end surface of the upper bearing casing 16, and the inner flange 42b protrudes radially toward the center from the inner circumferential surface of the upper bearing casing 16 inside the upper bearing casing 16.

[0029] The bearing 41 is cylindrical and is housed in the bearing holder 42. The outer peripheral surface of the bearing 41 is in close contact with the inner peripheral surface of the bearing holder 42. The inner peripheral surface of the bearing 41 is located radially inward of the inner flange 42b. A part of the lower end surface 41a of the bearing 41 abuts against the inner flange 42b. A part of the lower end surface 41a of the bearing 41 is not covered by the inner flange 42b and is exposed downward (however, as described later, most of this exposed portion is hidden by the first identification member 50 due to the installation of the first identification member 50). The upper end surface of the bearing 41 is located slightly below the upper surface of the outer flange 42a. The bearing 41 is clamped in the axial direction by the bearing retainer 43 provided above the bearing 41 and the bearing holder 42, and the inner flange 42b.

[0030] The sleeve 46 is fitted onto the outside of the main shaft 3 and rotates integrally with the main shaft 3. The sleeve 46 is inserted into the bearing 41. When the main shaft 3 is driven to rotate, the sleeve 46 rotates integrally with the main shaft 3, and the outer circumferential surface of the sleeve 46 comes into sliding contact with the inner circumferential surface of the bearing 41 that is supported by the casing 2 via a bearing holder, a bearing casing, and a rib. As a result, wear occurs in at least one of the bearing 41 and the sleeve 46.

[0031] In this embodiment, by way of example only, both the bearing 41 and the sleeve 46 are targets for monitoring the degree of wear (wear monitoring targets). The identification member is provided on the axially oriented surface of the wear monitoring target. When both the bearing 41 and the sleeve 46 are targets for wear monitoring, an identification member is provided on each of the bearing 41 and the sleeve 46. The first identification member 50 is for the bearing 41, and the second identification member 60 is for the sleeve 46.

[0032] The first identification member 50 is attached to the lower end face 41a, which is an example of a face oriented in the axial direction of the bearing 41. In particular, the first identification member 50 is attached to a portion of the lower end face 41a that protrudes radially inward from the inner flange 42b of the bearing holder 42 and is not covered by the inner flange 42b. The first identification member 50 is attached to this portion and protrudes downward from the bearing 41.

[0033] The second identification member 60 is installed on the stepped surface 46a, which is an example of a surface oriented in the axial direction of the sleeve 46. In this regard, a notch cut in the radial direction is provided at the tip of the sleeve 46. The notch may be provided over the entire circumference, or may be provided partially in the circumferential direction. By forming the notch, the stepped surface 46a is provided at the tip of the sleeve 46, which is closer to the axial center than the tip surface of the sleeve 46. In this embodiment, the tip is oriented downward, and the stepped surface 46a is oriented downward. In the assembled state, the stepped surface 46a is located at approximately the same position as the lower end surface 41a of the bearing 41 in the up-down direction (axial direction), and in this embodiment, it is located slightly below the lower end surface 41a of the bearing 41.

[0034] In this embodiment, the downward direction is the protruding direction of the identification member as viewed from the object to be monitored for wear, and is the side where the end opening of the passage 4a is located as viewed from the identification member. The end of the passage 4a opens into the inner circumferential surface of the upper bearing casing 16. The end opening of the passage 4a is spaced downward with respect to the bearing 41, the bearing holder 42, and the sleeve 46.

[0035] Although detailed illustration is omitted, the imaging device 80 is, for example, an industrial endoscope. The imaging device 80 may have a cable 81, an imaging unit 82 provided at the tip of the cable 81, and an operation unit 83 (see FIG. 1) provided at the base end of the cable 81. The imaging unit 82 has an imaging element (not shown) such as a CCD (Charge-Coupled Device) and an illumination (not shown) such as a white LED (Light-Emitting Diode). The imaging unit 82 acquires image data formed on the imaging element. The optical axis L of the imaging unit 82 is inclined with respect to the axial direction so as to move toward the radial inner periphery as it moves upward. Therefore, even if the first identification member 50 and the second identification member 60 are arranged on the radial inner periphery side with respect to the inner periphery surface of the upper bearing casing 16, the surfaces of the first identification member 50 and the second identification member 60 can be included within the field of view of the imaging unit 82. The image data is transmitted to the operation unit 83 via the cable 81.

[0036] The operation unit 83 has operators for inputting transfer and recording commands for the image data obtained by the imaging unit 82 and operation commands for the lighting. Input operations are performed by an operator. The operation unit 83 may be provided with a display for displaying an image formed on the imaging element in real time. The operation unit 83 also incorporates a power battery for the imaging device 80 and a memory for recording image data. The image data recorded in the memory can be transferred to an information terminal (for example, a personal computer, a tablet, or a smartphone) operated by an operator using a known information transmission technology. The image data transmitted via the cable 81 may also be displayed in real time on the display of these information terminals.

[0037] 3 and 4, the first identification member 50 is in an arc shape, for example, a quarter arc shape, when viewed in the axial direction. The first identification member 50 has a bottom surface 51, an inner peripheral surface 52, and an inclined surface 53 as surfaces, and these three surfaces form a right-angled triangular cross section. The bottom surface 51 is joined to the lower end surface 41a of the bearing 41 in a state of surface contact with the lower end surface 41a. The inner peripheral surface 52 extends vertically from the inner peripheral edge of the bottom surface 51 and is flush with the inner peripheral surface of the bearing 41. The inclined surface 53 connects the tip of the inner peripheral surface 52 of the first identification member 50 to the outer peripheral edge of the bottom surface 51. The inclined surface 53 is inclined with respect to the radial direction, and is inclined toward the axial direction (upward) as it moves from the inner peripheral side to the outer peripheral side in the radial direction. The first identification member 50 is disposed in an area or phase of the lower end surface of the bearing 41 that can face the passage 4a in the radial direction.

[0038] 3 and 5, the second identification member 60 is in an arc shape, for example, a quarter arc shape, when viewed in the axial direction. The second identification member has a bottom surface 61, a top surface 62, an outer peripheral surface 63, and an inner peripheral surface 64 as surfaces, and these four surfaces form a rectangular cross section. The bottom surface 61 is joined to the step surface 46a of the sleeve 46 in a state of surface contact with the step surface 46a. The outer peripheral surface 63 extends vertically from the inner peripheral edge of the bottom surface 61 and is joined to the outer peripheral surface of the reduced-diameter tip portion of the sleeve 46 in a state of surface contact with the outer peripheral surface. The inner peripheral surface 64 extends vertically from the outer peripheral edge of the bottom surface 61. The top surface 62 radially connects the tips of the outer peripheral surface 63 and the inner peripheral surface 64.

[0039] The surface of the first identification member 50 is colored in different colors from the inner periphery side to the outer periphery side. The colored surface may include at least the inclined surface 53 of the first identification member 50 that falls within the field of view of the imaging device 80.

[0040] As an example, the surface (inclined surface 53) of the first identification member 50 is painted in three different colors, green, yellow, and red, in that order from the inner periphery side. The width of each color (i.e., the radial dimension, or the difference between the outer diameter and the inner diameter) is constant in the circumferential direction. The green innermost layer 50a forms the overall inner diameter of the first identification member 50. The outer diameter of the innermost layer 50a is the same as the inner diameter of the yellow intermediate layer 50b. The outer diameter of the intermediate layer 50b is the same as the inner diameter of the red outermost layer 50c.

[0041] The same is true for the second identification member 60. The surface of the second identification member 60 (particularly the top surface 62 that falls within the field of view of the imaging device 80) is also painted in three different colors, green, yellow, and red, from the outer periphery side. The outermost peripheral layer 60a is a green layer, the intermediate layer 60b is a yellow layer, and the innermost peripheral layer 60c is a red layer.

[0042] The material of the bearing 41 is not particularly limited and may be appropriately selected from materials such as rubber and ceramics. The same applies to the sleeve 46. As the main shaft 3 rotates, the first identification member 50 wears in the same manner as the bearing 41. The second identification member 60 also wears in the same manner as the sleeve 46. The first identification member 50 has a hardness equal to or less than that of the bearing 41. The first identification member 50 may be molded from the same material as the bearing 41, or may be molded from a different material. The relationship between the hardness and material of the second identification member 60 and the sleeve 46 is similar to the above.

[0043] Here, the "initial state" of the bearing 41 or the sleeve 46 means a state in which no wear has occurred. Immediately after the pump 1 is newly installed at the plant, the bearing 41 and the sleeve 46 are in their initial state. Immediately after the bearing 41 or the sleeve 46 is replaced with a new one during maintenance work, the replaced object for wear monitoring is in its initial state.

[0044] In an initial state, the outer peripheral surface of the first identification member 50 and the inner peripheral surface of the second identification member 60 are in contact with each other or are close to each other with a very small clearance so as not to hinder the relative rotation of the sleeve 46 with respect to the bearing 41 ( FIG. 3 shows a state in which they are in contact as an example). The radial center side edge of the inclined surface 53 of the first identification member 50 intersects with the radial outer peripheral side edge of the top surface 62 of the second identification member 60.

[0045] Any joining means may be used to join the wear monitoring object and the identification member. An adhesive may be used. When the wear monitoring object and the identification member are made of rubber, heat fusion may be used.

[0046] In the pump 1 configured in this manner, wear monitoring is performed periodically or constantly. When it is performed periodically, an operator introduces the imaging device 80 into the upper bearing casing 16 via the introduction section 4. The usage cycle of the imaging device 80 (i.e., the cycle of the bearing monitoring work, or the cycle of acquiring image data showing the surface of the identification member) is not particularly limited. From one end of the introduction section 4 extending upward from the installation floor 91, the operator inserts the cable 81 into the introduction section 4, and introduces the imaging section 82 into the upper bearing casing 16. Then, image data showing the surface of the identification member and its surroundings is acquired by the imaging section 82.

[0047] Prior to acquiring the image data, the rotation of the main shaft 3 is stopped at a position where the phase of the second identification member 60 corresponds to the phase of the first identification member 50. Alternatively, while the main shaft 3 is rotating (i.e., while the pump 1 is operating), still image data is acquired at a timing where the phase of the second identification member 60 coincides with the phase of the first identification member 50.

[0048] 3 and 7, the image data acquired by the imaging section 82 includes an image of the inclined surface 53 as the surface of the first identification member 50 and an image of the top surface 62 as the surface of the second identification member 60. As shown in FIG.

[0049] In the initial state, the inclined surface 53 of the first identification member 50 and the top surface 62 of the second identification member 60 are in contact with each other, and the inclined surface 53 and the top surface 62 are integrated. In the central portion, the innermost layer 50a on the inclined surface 53 and the outermost layer 60a on the top surface 62 extend in an arc shape while being aligned in the radial direction. The two layers are colored the same color (e.g., green) and are integrated in the image. The intermediate layer 50b on the inclined surface 53 is adjacent to the radially outer side of this integrated green layer, and the intermediate layer 60b of the top surface 62 is adjacent to the radially inner side, and the two intermediate layers 50b, 60b are colored the same color (e.g., yellow). The two yellow layers extend in an arc shape so as to sandwich the integrated green layer in the radial direction. Further outside, the two red layers extend in an arc shape so as to sandwich the green layer and the two yellow layers on both sides of it. The red layer on the radially outer periphery side is the outermost layer 50c on the inclined surface 53, and the red layer on the radially inner periphery side is the innermost layer 60c on the top surface 62.

[0050] The worker can visually confirm a plurality of bands extending in an arc shape and color-coded from each other from the image data displayed on the display attached to the operation unit 83 or the display connected to or attached to the information terminal. In the initial state, as described above, a relatively thick green layer that is integrated in the central region can be confirmed. Based on such a display, the worker can easily determine that the wear monitoring target is in the initial state.

[0051] After acquiring the image data, the worker can pull up the cable 81 to remove the imaging device 80 from the pump 1 or its introduction part 4. In other words, the imaging device 80 does not need to be permanently attached to the pump 1, and can be attached to and detached from the pump 1 each time periodic monitoring work is performed.

[0052] 6 and 8 are diagrams corresponding to FIGS. 3 and 7, respectively, showing a state in which wear of the wear monitoring target has progressed.

[0053] 6, as wear of the bearing 41 progresses, the inner peripheral surface of the bearing 41 retreats toward the outer periphery in the radial direction. This retreat occurs generally uniformly over the entire circumferential direction and uniformly over the entire axial direction. As the bearing 41 wears, the first identification member 50 also wears in the radial direction. The first identification member 50 wears in the same manner as the bearing 41, and the amount of radial wear of the bearing 41 and the amount of radial wear of the first identification member 50 are equal. Therefore, even as wear progresses, the inner peripheral surface of the first identification member 50 remains flush with the inner peripheral surface of the bearing 41, just like in the initial state.

[0054] As the wear of the bearing 41 progresses, the width (radial dimension) of the bearing 41 is gradually reduced, beginning with the innermost layer 50a. In the example shown in FIG. 6, the innermost layer 50a is completely eliminated, and the intermediate layer 50b is also reduced from its inner periphery side. As a result, even if the sleeve 46 is not worn, as in the illustrated example, the inclined surface 53 of the first identification member 50 is separated from the top surface 62 of the second identification member 60 toward the outer periphery in the radial direction due to the recession of the inner periphery of the first identification member 50, and a gap is formed between the first identification member 50 and the second identification member 60. It is difficult for illumination to reach this gap.

[0055] 8, in image data acquired in such a worn state, the green layer in the central region becomes thinner by the amount that has disappeared from the first identification member 50. Then, between the green layer remaining on the second identification member 60 and the yellow layer remaining on the first identification member 50, a shadow in the gap is displayed in black. The worker can confirm that the green layer has disappeared or shrunk, and that a black stripe has appeared in place of the disappeared or shrunk green layer. Based on this confirmation result, the worker can determine that wear is progressing in the bearing 41.

[0056] The amount of wear that requires replacement is determined in advance according to the specifications of the pump 1 or the specifications of the main shaft 3 and the bearing. The radial dimension of the green layer (the innermost layer 50a in the first identification member 50, and the outermost layer 60a in the second identification member 60) may be several tens of percent of the amount of wear that requires replacement. The sum of the radial dimensions of the green layer and the yellow layer may be equal to the amount of wear that requires replacement. In this way, by associating the amount of wear that requires replacement with the radial dimensions of each layer, an operator can recognize that the time to replace the wear monitoring target is approaching when the green layer disappears (in other words, only the yellow layer and the red layer are displayed). In addition, an operator can recognize that the time to replace the wear monitoring target has arrived when the green layer and the yellow layer disappear (in other words, only the red layer is displayed). This allows an operator to easily determine the degree of wear of the wear monitoring target even if he or she is not highly skilled, and to perform replacement work in a timely manner.

[0057] In this embodiment, the surface of the first identification member 50 imaged by the imaging device 80 is an inclined surface 53, which is inclined with respect to the radial direction. The optical axis L of the imaging unit 82 is also inclined with respect to the radial direction and is aligned with the normal direction of the inclined surface 53. For this reason, the apparent amount of wear in the image data is larger than the actual amount of wear (the amount of wear in a direction that is not inclined axially with respect to the radial direction). Therefore, it is easy for an operator to determine the degree of wear of the identification member, and therefore of the object of wear monitoring, based on the imaging results.

[0058] In this way, the device for determining the degree of wear of the wear monitoring object is realized by placing an identification member on the wear monitoring object and providing an introduction section 4 for introducing an imaging device 80 for imaging the surface of this identification member to the pump 1. Therefore, the degree of wear of the wear monitoring object can be determined with a simple configuration.

[0059] The internal structure of the lower bearing casing 15 is similar to that of the upper bearing casing 16. However, the internal structure of the lower bearing casing 15 is upside down compared to that of the upper bearing casing 16. The bearing 31 is held by a bearing holder (details not shown) that fits into the lower end of the lower bearing casing 15, the first identification member is installed on the upper end surface of the bearing 31, and the second identification member is installed on a surface formed on the upper end of a sleeve (details not shown) and facing upward. The end opening of the branched portion 4c is disposed above the bearing 31, and the imaging device captures images of the surfaces of the first identification member and the second identification member from above. This allows the worker to easily determine the degree of wear of the bearing 31 and the sleeve fitted therein in the same manner as above.

[0060] Although the embodiment of the present invention has been described above, the above configuration can be appropriately modified, added to, or deleted within the scope of the spirit of the present invention.

[0061] The objects to be monitored for wear do not necessarily have to be both the bearing and the sleeve, and may be either the bearing or the sleeve alone. The objects to be monitored for wear in the lower bearing casing 15 may be different from the objects to be monitored for wear in the upper bearing casing 16. For the bearings and sleeves that are not the objects to be monitored for wear, the identification members to be installed thereon may be omitted.

[0062] The surface of the identification member to be imaged by the imaging device does not have to be inclined in the axial direction relative to the radial direction. As in the above embodiment, even if the surface (top surface 62) of the second identification member 60 is not inclined, the inclination of the optical axis L can provide the effect of increasing the apparent amount of wear. Note that the optical axis L may be parallel to the axial direction.

[0063] The colors applied to the surface of the identification member are not limited to those in the above embodiment, and the number of colors used is also not limited to those in the above embodiment.

[0064] In order to visually determine the wear, the identifier attached to the identification member is not limited to color coding from the inner periphery side to the outer periphery side in the radial direction. The identifier may be configured in any manner as long as it is configured to visually identify the presence or absence of wear in the radial direction. For example, the identifier may be a marking line. [Explanation of symbols]

[0065] 1 Pump 2 Casing 2a Intake port 2b Outlet 3 main axis 3a Impeller 4 Introduction 4a aisle 4b Common section 4c, 4d Branch 11 Trumpet 12 Impeller casing 13. Lifting pipe 14 Discharge elbow pipe 15 Lower bearing casing 16 Upper bearing casing 18 Ribs 19 Ribs 20 Impeller 31 Bearings 41 Bearings 41a Lower end surface 42 Bearing holder 42a Outer flange 42b Inner flange 43 Bearing holder 46 Sleeve 46a Step surface 50 First identification member 50a Innermost layer 50b middle class 50c outermost layer 51 Bottom 52 Inner surface 53 Slope 60 Second identification member 60a outermost layer 60b middle class 60c innermost layer 61 Bottom 62 Top surface 63 Outer Surface 64 Inner Surface 80 imaging device 81 ケーブル 82 Photography Department 83 Operation Department 90 sink 91 Pay bed L Axis

Claims

1. A casing; A main shaft extending within the casing and having an impeller fixed thereto; a bearing supported by the casing and configured to rotatably support the main shaft; a sleeve that is fitted onto the main shaft so as to rotate integrally with the main shaft and that is in sliding contact with an inner peripheral surface of the bearing; an identification member that is installed on an axially oriented surface of the bearing and / or the sleeve as a wear monitoring target and that wears in the same manner as the wear monitoring target with the rotation of the spindle; a passage for introducing an imaging device into the casing to image a surface of the identification member; A pump comprising:

2. At least the surface of the identification member is colored in different colors on the inner peripheral side and the outer peripheral side in the radial direction.

2. The pump of claim 1.

3. The surface of the identification member is an inclined surface inclined with respect to a radial direction.

2. The pump of claim 1.

4. The identification member has a hardness equal to or smaller than that of the wear monitoring target.

2. The pump of claim 1.

Images