JP2020063765A - Manufacturing method of divided slide ring and ring body for divided slide ring - Google Patents

Abstract

To form divided faces of a divided slide ring having a lot of displacements in an axial direction, a circumferential direction and a radial direction into divided bodies.SOLUTION: A manufacturing method of a divided slide ring 20 includes: a notched groove forming step of providing notched grooves 40 at two positions while being spaced in a circumferential direction of an annular ring 27 in an inner peripheral part 27a or an outer peripheral part 27b of the ring 27; and a dividing step of dividing the ring 27 into divided bodies 21A and 21B each having a divided face 22 in an irregular shape with the notched groove 40 defined as an initial point by applying a load F from the outside or the inside in a radial direction to the ring 27. In the notched groove forming step, a first bent portion 40c positioned on a first face 27c and having a first curvature radius r1 and a second bent portion 40d positioned on a second face 27d and having a second curvature radius r2 smaller than the first curvature radius r1 are formed in tip ends of the notched grooves 40.SELECTED DRAWING: Figure 4A

Description

  The present invention relates to a method for manufacturing a split sliding ring and a split sliding ring annulus.

  The mechanical seal includes a rotary ring that rotates integrally with the rotary shaft, and a fixed ring that is fixed to the seal cover, and the sliding contact of these forms a sealing surface. The rotating ring and the fixed ring need to be replaced when they are worn by sliding. In order to eliminate the need to remove the motor of the fluid machine at the time of replacement, a split type mechanical seal is known in which the rotary ring, the fixed ring, and the seal cover are divided into two in the circumferential direction. However, in the split type slide ring including the rotary ring and the fixed ring, if the alignment of the split surfaces is insufficient at the time of assembling, liquid may leak from the step generated on the seal surface (sliding contact surface).

  Patent Document 1 discloses a method of manufacturing a split slide ring for the purpose of improving the alignment accuracy of split surfaces. In Patent Document 1, a V-shaped cut groove (notch) is provided at a position facing the inner peripheral portion of the annular ring, and a load is applied from the inner side to the outer side of the ring so that the ring is divided into the first divided body and the first divided body. It is divided into two parts.

Japanese Patent No. 4298715

  In the split-type sliding ring of Patent Document 1, since the split surfaces of the first split body and the second split body have irregularly-shaped split surfaces that are broken from the cut groove as a starting point, alignment accuracy in the axial direction is provided. Can be improved. However, with the manufacturing method of Patent Document 1, there is little room for improvement in the accuracy of alignment because the displacement of the dividing surface in the circumferential direction is small.

  An object of the present invention is to form a split surface of a split slide ring, which has a large amount of displacement in the axial direction, the circumferential direction, and the radial direction, on the split body.

  A first aspect of the present invention is a method for manufacturing a split type sliding ring used for a mechanical seal, wherein an inner peripheral portion or an outer peripheral portion of an annular ring is recessed in a radial direction of the ring, and a shaft of the ring. In the direction from the outer side or the inner side in the radial direction with respect to the ring, and the notch groove penetrating from the first surface to the second surface in the direction of the ring is provided at two locations at intervals in the circumferential direction of the ring. A step of applying a load to divide the ring into a first divided body and a second divided body having an irregularly shaped dividing surface with the cutting groove as a starting point at both ends, and the cutting groove forming step Then, at the tip of the cut groove, a first curved portion having a first radius of curvature located closer to the first surface and a second curved portion located closer to the second surface and smaller than the first radius of curvature. Provided is a method of manufacturing a split slide ring, which forms a second curved portion having a radius of curvature.

  According to this method for manufacturing a split type sliding ring, when a load is applied to the ring, stress concentrates on the second surface having a small second radius of curvature, and the stress on the second surface changes from the second surface to the first surface. A crack is generated in the direction. Since cracks progress irregularly in the axial direction, the circumferential direction, and the radial direction of the ring, there are many displacements in the axial direction, the circumferential direction, and the radial direction of the split surfaces formed in the first split body and the second split body. Therefore, at the time of assembling, the first divided body and the second divided body can be accurately aligned with each other by the dividing surface having a complicated three-dimensional shape, so that the alignment accuracy can be effectively improved. As a result, it is possible to prevent a step from being generated on the sliding contact surface of the split slide ring, so that liquid leakage of the mechanical seal using the split slide ring can be effectively suppressed.

  A sliding contact portion is formed on the second surface to be in sliding contact with another sliding ring. That is, the radius of curvature of the cut groove is smaller on the second surface having the sliding contact portion.

  In the cutting groove forming step, the cutting groove is provided at an asymmetrical position of the ring. According to this aspect, the circumferential positions of the divided surfaces of the first divided body and the second divided body can be aligned with high accuracy, so that the alignment accuracy can be improved.

  Prior to the dividing step, an auxiliary groove is provided near the cut groove on the first surface, the auxiliary groove being recessed from the first surface toward the second surface and penetrating from the inner peripheral portion to the outer peripheral portion of the ring. A groove forming step is provided. According to this aspect, the crack due to the load is guided from the cut groove to the auxiliary groove, so that the divided surface having a complicated three-dimensional shape can be reliably formed in the first divided body and the second divided body.

  A second aspect of the present invention is a method for manufacturing a split type sliding ring used for a mechanical seal, wherein an inner peripheral portion or an outer peripheral portion of an annular ring is dented in a radial direction of the ring and a shaft of the ring. A notch groove that penetrates from the first surface to the second surface in the direction, and is provided at two locations at intervals in the circumferential direction of the ring, and in the vicinity of the notch groove of the first surface, An auxiliary groove forming step of providing an auxiliary groove that is recessed from the first surface toward the second surface and penetrates from the inner peripheral portion to the outer peripheral portion of the ring, and a load is applied to the ring from an outer side or an inner side in a radial direction. In addition, a method for manufacturing a split-type sliding ring, which comprises a splitting step of splitting the ring into a first splitting body and a second splitting body having at both ends a splitting surface having an irregular shape starting from the cut groove. I will provide a.

  According to this method of manufacturing a split slide ring, similar to the first aspect, it is possible to reliably form the split surface having a large amount of displacement in the axial direction, the circumferential direction, and the radial direction on the first split body and the second split body. Therefore, at the time of assembling, the first divided body and the second divided body can be accurately aligned with each other by the complicated three-dimensional divided surface, so that the alignment accuracy can be effectively improved. As a result, it is possible to prevent a step from being generated on the sliding contact surface of the split slide ring, so that liquid leakage of the mechanical seal using the split slide ring can be effectively suppressed.

  The split-type slide ring ring body used in the first aspect of the present invention is a ring body for producing a split-type slide ring used for a mechanical seal, and is an inner peripheral portion or an outer periphery of an annular ring. Provided at two positions spaced apart in the circumferential direction of the portion, recessed in the radial direction of the ring, and a notch groove penetrating from the first surface to the second surface in the axial direction of the ring, At the tip, a first curved portion having a first radius of curvature located toward the first surface, and a second curved portion having a second radius of curvature located closer to the second surface and smaller than the first radius of curvature. Have and.

  The split-type slide ring ring body used in the second aspect of the present invention is a ring body for producing a split-type slide ring used for a mechanical seal, and is an inner peripheral portion or an outer periphery of an annular ring. Notches provided at two locations spaced apart in the circumferential direction of the portion, recessed in the radial direction of the ring, and penetrating from the first surface to the second surface in the axial direction of the ring, and the first surface described above. The auxiliary groove is provided near the cut groove, is recessed from the first surface toward the second surface, and penetrates from the inner peripheral portion to the outer peripheral portion of the ring.

  According to the present invention, since the dividing surface having a complicated three-dimensional shape with many displacements in the axial direction, the circumferential direction, and the radial direction can be reliably formed at both ends of the first dividing body and the second dividing body, the dividing surface can be easily assembled. Can be accurately aligned. Therefore, since it is possible to prevent the occurrence of a step on the sliding contact surface of the split slide ring, it is possible to effectively suppress the liquid leakage of the mechanical seal using the split slide ring.

FIG. 3 is a plan view of a split type mechanical seal using the sliding ring according to the first embodiment of the present invention. FIG. 2 is a sectional view taken along the line A-O-B in FIG. 1. FIG. 2 is a sectional view taken along line C-O-D of FIG. 1. Front view of the seat. Rear view of the seat. FIG. 5B is a sectional view taken along line VV of FIG. Front view of the washer. Rear view of washer. VI-VI sectional view taken on the line of FIG. 5B. Sectional drawing which shows the 1st step of a cut groove formation process. The rear view which shows the crack of the 2nd surface side by a division process. The front view which shows the crack of the 1st surface side by a division process. The front view of the seat | sheet of 2nd Embodiment. The rear view of the seat | sheet of 3rd Embodiment. The side view of a part of seat of 3rd Embodiment. The rear view of the seat | sheet of 4th Embodiment. The rear view of the seat | sheet of 5th Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
1 to 3 show a split type mechanical seal (hereinafter abbreviated as "mechanical seal") 10 using a split type sliding ring according to a first embodiment of the present invention. As shown in FIGS. 2 and 3, the mechanical seal 10 includes a seat (rotary ring) 20 and a washer (fixed ring) 30 that form a sealing surface 45. These are the split-type sliding rings of the present invention. is there.

  First, the outline of the mechanical seal 10 will be described.

  As shown in FIG. 2 and FIG. 3, the mechanical seal 10 is provided in the casing 1 in order to prevent liquid (for example, pumped water) inside the casing 1 of the rotary machine (for example, vertical pump) from leaking to the outside (atmosphere side). The rotary shaft 2 is arranged at a portion penetrated by the rotary shaft 2. 2 and 3, the lower side of the mechanical seal 10 communicates with the inside of the casing 1. In the following description, the lower side in FIGS. 2 and 3 may be referred to as the inner side, and the upper side in FIGS. 2 and 3 may be referred to as the outer side.

  The mechanical seal 10 includes a sheet holder 12, a sheet 20, and a washer 30, which are arranged inside a seal cover 50 (sealing liquid chamber 52). A clasp 60 and a pusher 70 are further arranged in the seal cover 50, and the outer end of the seal cover 50 is covered with a plate 75. Referring to FIG. 2, a coil spring 83 is arranged between the plate 75 and the pressing metal 70, and the coil spring 83 biases the washer 30 toward the seat 20 via the pressing metal 70.

  The mechanical seal 10 is an inside type that prevents the liquid from flowing out from the sealing liquid chamber 52 communicating with the inside of the casing 1 to the rotary shaft 2 side (radially inner side) communicating with the atmosphere by the seat 20 and the washer 30. When the rotary shaft 2 rotates, the seat holder 12 and the seat 20 rotate together with the rotary shaft 2, and the seat 20 makes sliding contact with the washer 30 fixed to the seal cover 50. The sealing surface 45 formed by the sliding contact portion between the seat 20 and the washer 30 prevents the liquid from flowing from the sealing liquid chamber 52 toward the rotary shaft 2.

  Referring to FIG. 3, the seat holder 12 is arranged so as to be located near the casing 1 with respect to the rotating shaft 2, and is fixed by a set bolt 15.

  The seat 20 is mounted in the mounting recess 16 on the outside of the seat holder 12. The rotation of the seat 20 with respect to the seat holder 12 in the circumferential direction is restricted by a pin 17 arranged in the mounting recess 16. As a result, the seat 20 rotates integrally with the rotating shaft 2 via the seat holder 12.

  The washer 30 is arranged in the seal cover 50 so as to be located outside the seat 20. Referring to FIG. 2, rotation of the washer 30 with respect to the seal cover 50 in the circumferential direction is restricted by the drive pin 80 penetrating the clasp 60, the pusher plate 70, and the plate 75, so that the washer 30 moves in the axial direction with respect to the seal cover 50. Is allowed.

  The seal cover 50 includes a through hole 51 through which the rotary shaft 2 penetrates and an annular sealing liquid chamber 52. Referring to FIG. 3, the seal cover 50 is fixed to the casing 1 by tightening a bolt 55 penetrating along the rotary shaft 2 into the bolt hole 1 a.

  The clasp 60 is arranged on the inner side of the plate 75. The clasp 60 is fixed to the seal cover 50 by bolts 63 with reference to FIG. 2, and is fixed to the plate 75 by bolts 64 with reference to FIG.

  The pusher plate 70 is arranged between the clasp 60 and the washer 30. One end of the coil spring 83 penetrating the clasp 60 is arranged on the pressing plate 70, and the other end of the coil spring 83 is arranged on the plate 75. The pusher 70 presses (biases) the washer 30 toward the seat 20 by the bias of the coil spring 83. The reference numeral 73 in FIGS. 1 and 3 is a bolt for holding the coil spring 83 between the plate 75 and the pressing metal 70. The bolt 73 is used at the time of assembling and disassembling, and attaches the pusher plate 70 to the plate 75 so that the biasing force of the coil spring 83 is not applied to the washer 30. In normal use, the bolt 73 is removed.

  The mechanical seal 10 of the present embodiment is a full-division type in which the seat holder 12, the seat 20, the washer 30, the seal cover 50, the clasp 60, the presser 70, and the plate 75 are each divided into two in the circumferential direction. That is, the sheet holder 12 is an annular body including the first holding member 13A and the second holding member 13B. The seat 20 is an annular body including a first rotating member 21A and a second rotating member 21B. The washer 30 is an annular body including a first fixing member 31A and a second fixing member 31B. The seal cover 50 is an annular body including a first cover member 53A and a second cover member 53B. The clasp 60 is an annular body including a first connecting member 61A and a second connecting member 61B. The pusher plate 70 is an annular body including a first pressing member 71A and a second pressing member 71B. The plate 75 is an annular body including a first plate member 76A and a second plate member 76B.

  Referring to FIG. 1, the holding members 13A and 13B that form the seat holder 12 are semi-annular, and the dividing surfaces 14 extend left and right (first direction) in FIG. The rotating members 21A and 21B that form the seat 20 are semi-annular, and the dividing surfaces 22 extend substantially vertically (second direction) in FIG. The fixing members 31A and 31B forming the washer 30 have a semi-annular shape, and the dividing surfaces 32 thereof extend substantially left and right in FIG. The cover members 53A and 53B that constitute the seal cover 50 are semi-annular, and the dividing surfaces 54 extend vertically in FIG. The connecting members 61A and 61B forming the clasp 60 have a semi-annular shape, and their dividing surfaces 62 extend vertically in FIG. The pressing members 71A and 71B that form the presser 70 are semi-annular, and their dividing surfaces 72 extend vertically in FIG. The plate members 76A and 76B forming the plate 75 have a semi-annular shape, and the dividing surfaces 77 extend vertically in FIG.

  In this all-split type mechanical seal 10, the plate 75 is removed from the clasp 60, and the seal cover 50 is removed from the casing 1 outward in the radial direction, whereby the seat 20 and the washer 30 can be removed and attached. Therefore, the seat 20, the washer 30, and the coil spring 83, which are consumable parts, can be replaced without removing the motor at the tip of the rotary shaft 2.

  Hereinafter, the seat 20 and the washer 30 which are the split type slide rings of the present invention will be specifically described.

(Outline of sheet)
As shown in FIGS. 2 and 3, the seat 20 in the assembled state is an annular ring having a substantially square cross section. A part of the end surface of the sheet 20 located on the upper side in FIGS. 2 and 3 is a sliding contact surface (sliding contact portion) 20 a that forms a sealing surface 45 by sliding contact with the washer 30.

  The first rotating member 21A and the second rotating member 21B that form the seat 20 are formed in a substantially semi-annular shape when viewed in the axial direction of the rotating shaft 2. Steps 23 are provided on the outer circumferences of the rotating members 21A and 21B, respectively. A seal member 24 is disposed between the mounting recess 16 formed in the seat holder 12 and the step portion 23 to seal them. The elastic force of the seal member 24 holds the rotary members 21A and 21B in an annular shape, and the seat 20 is held in the mounting recess 16 in a floating state. Referring to FIG. 3, locking grooves 25 for locking the pins 17 of the sheet holder 12 are provided below the rotating members 21A and 21B, respectively. By the locking of the pin 17 in the locking groove 25, the rotation of the sheet 20 in the circumferential direction with respect to the sheet holder 12 is restricted, and the axial movement of the sheet 20 with respect to the sheet holder 12 is allowed.

(Outline of washers)
Continuing to refer to FIGS. 2 and 3, the washer 30 in the assembled state is an annular ring whose axial dimension is longer than that of the seat 20. 2 and 3, the end face of the washer 30 located on the lower side is provided with a convex portion (sliding contact portion) 30a having a quadrangular cross section and protruding toward the seat 20. The tip end surface of the convex portion 30a is a sliding contact surface 30b that forms a seal surface 45 by sliding contact with the sheet 20.

  The first fixing member 31A and the second fixing member 31B that form the washer 30 are formed in a substantially semi-annular shape when viewed in the axial direction of the rotary shaft 2. Steps 33 are provided on the outer circumferences of the fixing members 31A and 31B, respectively. A seal member 34 that seals the gap between the seal cover 50 and the step portion 33 is arranged. The elastic force of the seal member 34 holds the fixing members 31A and 31B in an annular shape, and the washer 30 is held in the seal cover 50. Referring to FIG. 2, locking grooves 35 are provided on the outer end surfaces of the fixing members 31A and 31B at intervals in the circumferential direction. By locking the locking portion 81 at the tip of the drive pin 80 in the locking groove 35, rotation of the washer 30 in the circumferential direction is restricted, and movement of the washer 30 in the axial direction of the rotary shaft 2 is allowed.

  Assembly of the seat 20 and the washer 30 to the rotating shaft 2 is performed as follows.

  First, the first rotating member 21A and the second rotating member 21B having the dividing surface 22 coated with grease are arranged on the outer circumference of the rotating shaft 2. Then, the positions of the first rotating member 21A and the second rotating member 21B in the axial direction, the circumferential direction, and the radial direction are aligned to eliminate the step of the dividing surface 22 (sliding contact surface 20a), and these are integrated by the adhesive force of grease. To do. Next, the first fixing member 31 </ b> A and the second fixing member 31 </ b> B having the dividing surface 32 coated with grease are arranged on the outer periphery of the rotary shaft 2, and these are placed on the sheet 20. Then, the positions of the first fixing member 31A and the second fixing member 31B in the axial direction, the circumferential direction, and the radial direction are aligned to eliminate the step of the dividing surface 32 (sliding contact surface 30b), and these are integrated by the adhesive force of grease. To do.

  When the split surfaces 22 and 32 are flat, it is difficult to align the split surfaces 22 and the split surfaces 32 in the axial direction and the radial direction. After assembling, when one of the rotating members 21A, 21B and the fixing members 31A, 31B has a step, a gap is created between the sliding contact surfaces 20a, 30b of the seat 20 and the washer 30. In this case, liquid leaks from the inside of the casing 1 to the outside through the gap. In order to prevent this problem, in the present invention, the dividing surfaces 22 of the rotating members 21A and 21B and the dividing surfaces 32 of the fixed members 31A and 31B can be aligned with high accuracy.

(Details of seat and washer)
The rotating members 21A and 21B that form the seat 20 are formed by dividing the ring body (ring body for split slide ring) 26 shown in FIGS. 4A to 4C into two. The fixing members 31A and 31B constituting the washer 30 are formed by dividing the ring body (ring body for split slide ring) 36 shown in FIGS. 5A to 5C into two. The ring bodies 26 and 36 are annular rings 27 and 37 made of a brittle material such as ceramic or carbon. The ring 27 is preliminarily formed with the end surface including the sliding contact surface 20a, the step portion 23, and the locking groove 25. The ring 37 is preliminarily formed with the convex portion 30a including the sliding contact surface 30b, the step portion 33, and the locking groove 35.

  The rings 27, 37 include inner peripheral portions 27 a, 37 a having a diameter larger than that of the rotating shaft 2. The cut grooves 40 are formed at two positions of the inner peripheral portions 27a and 37a facing each other, and a load F is applied to the rings 27 and 37 from the outer side to the inner side in the radial direction. The rings 27 and 37 are broken to form the rotary members 21A and 21B and the fixed members 31A and 31B, respectively.

  Referring to FIG. 4A to FIG. 4C and FIG. 5A to FIG. 5C, the cut groove 40 is recessed radially outward of the rings 27, 37, and the first surface 27c, 37c to the second surface of the rings 27, 37 in the axial direction. It penetrates to 27d and 37d. The first surface 27c of the ring 27 is an end surface in which the locking groove 25 is formed, the second surface 27d of the ring 27 is located on the opposite side of the first surface 27c, and includes the sliding contact surface 20a. 20 end faces. The first surface 37c of the ring 37 is an end surface in which the locking groove 35 is formed, and the second surface 37d of the ring 37 is located on the opposite side of the first surface 37c and is a convex surface including the sliding contact surface 30b. A portion 30a is an end face of the washer 30 on which the protrusion is provided.

  The shape of the cut groove 40 as viewed in the axial direction of the rings 27 and 37 is substantially V-shaped. More specifically, the cut groove 40 has a pair of inclined portions 40a inclined so as to gradually approach from the inside to the outside of the rings 27 and 37, and a curved surface provided at the tips of the pair of inclined portions 40a. And a continuous portion 40b. The radii of curvature r1, r2 of the continuous portion 40b, which is the tip of the cut groove 40 in the radial direction of the rings 27, 37, differ between the first surfaces 27c, 37c and the second surfaces 27d, 37d. That is, the continuous portion 40b includes the first curved portion 40c having the first radius of curvature r1 located toward the first surfaces 27c and 37c and the second curved portion 40c having the second radius of curvature r2 located toward the second surfaces 27d and 37d. And a curved portion 40d.

  As shown most clearly in FIGS. 4A and 5A, the first curvature radius r1 of the first bending portion 40c is larger than the second curvature radius r2 of the second bending portion 40d. As a result, the stress due to the load F is concentrated on the second bending portion 40d rather than the first bending portion 40c. For example, by forming a first curved portion 40c having a large first curvature radius r1 so as to penetrate the rings 27 and 37 by laser processing, and then cutting a part of the first curved portion 40c, the second surface 27d, A second curved portion 40d having a small second curvature radius r2 is formed on the 37d side. As a result, a continuous portion 40b having the first curved portions 40c having the first curvature radius r1 on the first surfaces 27c and 37c and the second curved portion 40d having the second curvature radius r2 on the second surfaces 27d and 37d is formed. To be done.

  The angle between the pair of inclined portions 40a, that is, the groove angle θ1 of the V-shaped cut groove 40 is set to be larger than 5 degrees and smaller than 180 degrees (5 degrees <θ1 <180 degrees), preferably 30 degrees. Is set to be larger than 150 degrees and smaller than 150 degrees (30 degrees <θ1 <150 degrees). When the groove angle θ1 is made excessively small, there is no difference between the radii of curvature r1 and r2 of the first bending portion 40c and the second bending portion 40d, and stress is exerted on both the first bending portion 40c and the second bending portion 40d during division. They act at the same time, and the stress cannot be concentrated only on the second curved portion 40d. On the other hand, when the groove angle θ1 is excessively increased, the stress acting on the first curved portion 40c is dispersed, and the rings 27 and 37 may be divided into three or more. Therefore, it is preferable that the groove angle θ1 of the cut groove 40 be formed within the set range.

  The radius of the inner peripheral portions 27a and 37a of the rings 27 and 37 is R1, the dimension from the inner peripheral portions 27a and 37a to the outer peripheral portions 27b and 37b in the radial direction of the rings 27 and 37 is d1, and the axial direction of the rings 27 and 37 is When the length (thickness from the first surface 27c, 37c to the second surface 27d, 37d) is L1, the groove depth d2 of the first bending portion 40c, the first curvature radius r1 of the first bending portion 40c, and the first curvature radius r1. The length L2 of the 2-curved portion 40d is set as follows.

  The groove depth d2 of the first curved portion 40c is a dimension from the inner peripheral portions 27a, 37a of the rings 27, 37 to the top of the first curved portion 40c. The groove depth d2 is set to be larger than 0.1 mm and smaller than 0.5 × d1 (0.1 mm <d2 <0.5 × d1), preferably larger than 1 mm and larger than 0.3 × d1. It is set small (1 mm <d2 <0.3 × d1). If the groove depth d2 is excessively shallow, it does not function as the cut groove 40 that concentrates stress. When the groove depth d2 is excessively deep, the areas of the divided surfaces 22 and 32 formed are too small. Therefore, it is preferable that the groove depth d2 of the first curved portion 40c be formed within the set range.

  The first radius of curvature r1 of the first curved portion 40c is set to be larger than 0.07 mm and smaller than the radius R1 (0.07 mm <r2 <R1), preferably larger than 0.6 mm and larger than the groove depth d2. It is set small (0.6 mm <r1 <d2). When the first radius of curvature r1 is made excessively small, the difference between the second radius of curvature 40d and the second radius of curvature r2 disappears, and stress acts on both the first radius 40c and the second radius 40d at the same time during division. The stress cannot be concentrated only on the second curved portion 40d. When the first radius of curvature r1 is excessively increased, the stress acting on the first curved portion 40c is dispersed, and the rings 27 and 37 may be divided into three or more. Therefore, it is preferable that the first radius of curvature r1 of the first curved portion 40c be formed within the set range.

  The second radius of curvature r2 of the second curved portion 40d is set to be larger than 1 μm and smaller than 10 mm (1 μm <r2 <10 mm), preferably larger than 10 μm and smaller than 5 mm (10 μm <r2 <5 mm. ). The second radius of curvature r2 is preferably as small as possible, but it is technically difficult to form the second curved portion 40d of 1 μm or less after the formation of the first curved portion 40c. When the second radius of curvature r2 is excessively increased, the difference between the second radius of curvature 40d and the second radius of curvature r2 disappears, and stress acts on both the first radius 40c and the second radius 40d at the same time during division. The stress cannot be concentrated only on the second curved portion 40d. Therefore, it is preferable that the second curvature radius r2 of the second bending portion 40d be formed within the set range.

  The length L2 of the second curved portion 40d is the dimension of the formation region of the second curved portion 40d in the axial direction of the rings 27, 37. The length L2 of the second curved portion 40d is set to be larger than 1 mm and smaller than 0.8 × L1 (1 mm <L2 <0.8 × L1), and preferably larger than 0.1 × L1 and 0. It is set smaller than 5 × L1 (0.1 × L1 <L2 <0.5 × L1). When the length L2 is excessively shortened, it does not function as the second bending portion 40d that concentrates the stress. When the length L2 is made excessively long, the first bending portion 40c does not function, and the displacements of the fracture positions on the first surface 27c, 37c side and the second surface 27d, 37d side in the circumferential direction of the rings 27, 37 are too small. become. Therefore, it is preferable that the length L2 of the second bending portion 40d be formed within the above setting range.

(Method for manufacturing split type sliding ring)
The rotating members 21A and 21B of the seat 20 and the fixing members 31A and 31B of the washer 30 form the cut grooves 40 in the rings 27 and 37 (cut groove forming step), and then the rings 27 and 37 are divided into two. It is manufactured by dividing (dividing step). As described above, the ring 27 has the sliding contact surface 20a, the step portion 23, and the locking groove 25 formed in advance. Further, the ring 37 is preliminarily formed with the convex portion 30a including the sliding contact surface 30b, the step portion 33, and the locking groove 35.

(Outline of cut groove forming process)
In the cut groove forming step, the cut groove 40 including the first curved portion 40c and the second curved portion 40d is formed at the position where the inner peripheral portions 27a and 37a of the rings 27 and 37 face each other. Specifically, in the cut groove forming step, a first step (see FIG. 6) of forming a temporary groove 40 ′ having a first curved portion 40c and a second curved portion 40d of the temporary groove 40 ′ are formed. The second step of completing the cut groove 40 (see FIGS. 4C and 5C).

  As shown in FIG. 6, in the first step, with the groove depth d2 and the first radius of curvature r1 defined within the above-mentioned setting range, the inner peripheral portions 27a, 27a, Temporary grooves 40 'having a first curved portion 40c are formed at the positions facing each other at 37a. The provisional groove 40 'is formed by, for example, laser processing. The first step is a step of forming a ring 27 including a sliding contact surface 20a, a step portion 23, and a locking groove 25, and a convex portion 30a including a sliding contact surface 30b, a step portion 33, and a locking groove 35. It may be performed simultaneously with the step of forming the ring 37.

  In the second step, the second surfaces 27d and 37d of the temporary groove 40 'are ground to form the second curved portion 40d having the second radius of curvature r2. The formation of the second curved portion 40d is performed, for example, by laser processing. As a result, the first surfaces 27c and 37c serve as the first curved portion 40c having the first radius of curvature r1, and the second surfaces 27d and 37d serve as the second curvature radius r2 that is smaller than the first radius of curvature r1. The cut groove 40 is formed as the curved portion 40d.

  The rings 27 and 37 are made of a fired body. If the second curved portion 40d is formed before firing the rings 27 and 37, the rings 27 and 37 may be damaged due to thermal contraction during firing. Therefore, the first step of forming the first curved portion 40c is performed before firing the rings 27 and 37, and the second step of forming the second curved portion 40d is performed after firing the rings 27 and 37. It is preferable in that the yield can be improved. However, if damage to the rings 27 and 37 can be prevented, the step of forming the cut groove 40 including the first curved portion 40c and the second curved portion 40d may be performed simultaneously before or after firing the rings 27 and 37. Good.

(Outline of division process)
As shown in FIGS. 4A and 5A, in the dividing step, the support member 90 and the pressing member (not shown) are arranged at the radially opposed positions of the rings 27 and 37, and the load F is applied by the pressing member. Then, the rings 27 and 37 are divided into two. Specifically, in the radial direction of the rings 27, 37, the support member 90 is arranged on the outer peripheral portions 27b, 37b of one (lower side) forming position of the pair of cut grooves 40, and the other (upper) forming position. A pressure member is disposed on the outer peripheral portions 27b and 37b of the. The support member 90 has a support surface having a length L1 or more in the axial direction of the rings 27 and 37, and the support surface is arranged along the axial direction of the rings 27 and 37. The support member 90 may be provided with a groove for arranging the rings 27 and 37. The pressing member has a pressing portion having a length equal to or longer than the axial length L1 of the rings 27 and 37, and the pressing portion is arranged along the axial directions of the rings 27 and 37. As shown by the arrows in FIGS. 4A and 5A, the pressure member is moved toward the support member 90, and the load F is applied to the rings 27 and 37 from the outer side to the inner side in the radial direction.

  The stress due to the load F is concentrated on the smaller one of the curved portions 40c and 40d having different radii of curvature r1 and r2. Therefore, cracks are generated in the rings 27 and 37 starting from the apex P of the second curved portion 40d having the small second radius of curvature r2. The crack progresses from the top P of the second curved portion 40d along the second surfaces 27d, 37d, and proceeds from the top P of the second curved portion 40d through the cut groove 40 along the first surfaces 27c, 37c. .

  As shown in FIG. 7A, the crack C1 on the second surface 27d, 37d side is a support position (a portion where the support member 80 abuts) or a pressurization position (load F is applied from the top P of the second curved portion 40d. The irregular part (non-linear). The crack C2 in the cut groove 40 progresses irregularly from the top P of the second curved portion 40d toward the first curved portion 40c. Therefore, the crack C2 reaches a portion other than the top portion of the first bending portion 40c. As shown in FIG. 7B, the crack C3 on the first surface 27c, 37c side is the intersection of the edge of the first curved portion 40c located on the first surface 27c, 37c and the crack C2 (the top of the first curved portion 40c. (Parts other than the above) move toward the supporting position or the pressing position irregularly.

  As a result, the rings 27 and 37 are irregularly fractured outward in the radial direction starting from the cut groove 40 and divided into two. By the division of the ring 27, a first rotating member (first divided body) 21A and a second rotating member (second divided body) 21B that form the seat 20 are formed. By dividing the ring 37, a first fixing member (first divided body) 31A and a second fixing member (second divided body) 31B that form the washer 30 are formed.

  As described above, the positions of the cracks generated on the first surfaces 27c and 37c side and the positions of the cracks generated on the second surfaces 27d and 37d side are different in the circumferential direction of the rings 27 and 37. Therefore, the divided surfaces 22 and 32 formed at both ends of the rotating members 21A and 21B and the fixed members 31A and 31B are displaced in the axial direction, the circumferential direction, and the radial direction as compared with the cut grooves having the same radius of curvature. There are many. That is, the rotating members 21A and 21B include the irregularly-displaced complex three-dimensional shaped dividing surface 22, and the fixed members 31A and 31B include the irregularly-displaced complex three-dimensional shaped dividing surface 32.

  When the seat 20 and the washer 30 are assembled, the rotary members 21A and 21B and the fixed members 31A and 31B can be accurately aligned by the three-dimensionally divided surfaces 22 and 32. Therefore, the alignment accuracy of the seat 20 and the washer 30 with respect to the rotating shaft 2 can be effectively improved. Further, it is possible to prevent the occurrence of a step between the sliding contact surfaces 20a and 30b of the seat 20 and the washer 30. Therefore, liquid leakage of the mechanical seal 10 using the seat 20 and the washer 30 can be effectively suppressed.

(Second embodiment)
FIG. 8 shows a ring body 26 of the second embodiment that forms a split slide ring (sheet 20). As shown in FIG. 8, in the second embodiment, the cut grooves 40A and 40B similar to those in the first embodiment are arranged at the asymmetrical position of the ring 27 (that is, at an angular position other than 180 degrees) about the axis of the ring 27. ) Is different from the first embodiment. The washer annulus is manufactured similarly to the annulus 26 of the sheet 20 shown in FIG.

  The angular position at which the cut grooves 40A, 40B are formed in the inner peripheral portion 27a, that is, the arrangement angle θ2 of the cut grooves 40A, 40B around the axis of the ring 27 is the radius R1 of the inner peripheral portion 27a of the ring 27, It is set based on the radius R2 of the rotating shaft 2. Specifically, the arrangement angle θ2 is set so that the interval I between the cut grooves 40A and 40B is equal to or larger than the diameter (2 × R2) of the rotating shaft 2. The interval I between the cut grooves 40A and 40B is a distance when two positions on the inner peripheral portion 27a forming the cut grooves 40A and 40B are connected by a straight line.

  In this way, even when the ring 27 having the cut grooves 40A and 40B formed at the asymmetrical positions is divided, the support member 90 and the pressing member face the ring 27 at the opposing position (position of 180 degrees) as in the first embodiment. ), The pressure member is moved toward the support member 90. Thereby, the crack generated from the cut grooves 40A and 40B as a starting point progresses from the inner peripheral portion 27a toward the outer peripheral portion 27b, and the ring 27 is broken (divided).

  In the pair of cut grooves 40 provided at the facing positions (symmetrical positions) as in the first embodiment, since the dividing surfaces are located in parallel as shown in FIG. 4A, the vertical positional deviation during assembly is completely eliminated. It is difficult to lose. However, in the cut grooves 40A and 40B provided at asymmetrical positions as in the second embodiment of FIG. 8, the dividing surfaces are not positioned in parallel, so it is possible to reliably prevent the positional deviation in the vertical direction. Therefore, when the rotary members 21A and 21B formed by the ring 27 are arranged on the rotary shaft 2, the dividing surfaces 22 can be aligned with high accuracy, and the alignment accuracy can be further improved.

(Third Embodiment)
9A and 9B show a ring body 26 of the third embodiment forming a split type sliding ring (sheet 20). As shown in FIG. 9A, the third embodiment differs from the first embodiment in that an auxiliary groove 42 is provided near the cut groove 40. The washer annulus is manufactured similarly to the annulus 26 of the sheet 20 shown in FIG. 9A. The arrangement angle θ2 of the pair of cut grooves 40 may be other than 180 degrees as in the second embodiment. It is preferable that the cut groove 40 includes a first curved portion and a second curved portion having different curvature radii r1 and r2, as in the first embodiment, but a curved portion having a uniform radius of curvature at the tip (continuous portion). ) May be provided.

  Referring also to FIG. 9B, the auxiliary groove 42 is formed on the first surface 27c on which the locking groove 25 is formed, and is not formed on the second surface 27d including the sliding contact surface 20a. The auxiliary groove 42 is recessed from the first surface 27c toward the second surface 27d, and penetrates in a V-shaped cross section from the inner peripheral portion 27a to the outer peripheral portion 27b.

  The inner end of the auxiliary groove 42 located on the inner peripheral portion 27 a is arranged on the formation position of the cut groove 40. The outer end of the auxiliary groove 42 located on the outer peripheral portion 27b is arranged apart from the imaginary line (not shown) in the radial direction connecting the center of the ring 27 and the cut groove 40 in the circumferential direction. That is, the auxiliary groove 42 is inclined with respect to the virtual line described above. The auxiliary groove 42 of the present embodiment has a linear shape that is inclined rightward from the inner peripheral portion 27a toward the outer peripheral portion 27b, but may be inclined in the opposite direction.

  The rotating members 21A and 21B of the seat 20 are manufactured by performing the same cut groove forming step, auxiliary groove forming step, and dividing step as in the first embodiment on the ring 27 in this order. To be done. In the auxiliary groove forming step, the auxiliary groove 42 is formed in the first surface 27c by cutting, for example.

  When the ring 27 is divided, the support member 90 and the pressure member are arranged in the same manner as in the first embodiment, and the pressure member is moved toward the support member 90 toward each other. As a result, the crack generated from the cut groove 40 as a starting point advances along the auxiliary groove 42, and the ring 27 is broken (divided).

  In the case of the cut groove 40 including the first curved portion and the second curved portion having different radii of curvature, the stress due to the load F is concentrated on the top portion of the second curved portion, and the crack generated from the top portion is the second surface. While advancing along 27d, it advances to the 1st surface 27c through the continuous part of the cut groove 40. The crack on the first surface 27c side proceeds from the first curved portion along the bottom (top portion) of the auxiliary groove 42. The crack on the second surface 27d on which the second curved portion is located basically goes from the top of the second curved portion toward the pressure position, but while being displaced in the circumferential direction by being guided by the crack on the first surface 27c side. move on.

  In the case of the cut groove 40 having a curved portion with a uniform radius of curvature, stress concentrates on the bottom (continuous portion) of the cut groove 40 along the axial direction of the ring 27, and cracks generated starting from the continuous portion are generated. Proceed along the bottom (top) of the auxiliary groove 42. However, the crack on the second surface 27d without the auxiliary groove 42 proceeds while being irregularly displaced while being guided by the crack on the first surface 27c side.

  As described above, in the ring 27 including the auxiliary groove 42, the crack due to the load F is guided from the cut groove 40 to the auxiliary groove 42, so that the formed split surface 22 is displaced in the axial direction, the circumferential direction, and the radial direction. growing. Therefore, when the rotary members 21A and 21B are arranged on the rotary shaft 2, the rotary members 21A and 21B can be aligned with high precision by the dividing surface 22 having a complicated three-dimensional shape, so that the alignment accuracy can be improved.

(Fourth Embodiment)
FIG. 10 shows a ring body 26 of the fourth embodiment forming a split type sliding ring (sheet 20). As shown in FIG. 10, the fourth embodiment is different from the third embodiment in that the inner end of the auxiliary groove 42 is provided at an interval in the circumferential direction with respect to the cut groove 40. The inner end and the outer end of the auxiliary groove 42 are arranged at the same distance in the circumferential direction with respect to the cut groove 40. The auxiliary groove 42 extends in the radial direction of the ring 27.

(Fifth Embodiment)
FIG. 11 shows a ring body 26 of the fifth embodiment that forms a split slide ring (sheet 20). As shown in FIG. 11, in the fifth embodiment, the auxiliary groove 42 is provided in parallel with a radial virtual line (not shown) connecting the center of the ring 27 and the cut groove 40. This is different from the third embodiment. Similar to the fourth embodiment, the inner end and the outer end of the auxiliary groove 42 are arranged at the same intervals in the circumferential direction with respect to the cut groove 40 at intervals.

  Also in the fourth embodiment shown in FIG. 10 and the fifth embodiment shown in FIG. 11, the ring body of the washer is manufactured in the same manner as the ring body 26 of the seat 20. Further, the arrangement angle θ2 of the pair of cut grooves 40 may be other than 180 degrees as in the second embodiment. It is preferable that the cut groove 40 includes a first curved portion and a second curved portion having different curvature radii r1 and r2, as in the first embodiment, but a curved portion having a uniform radius of curvature at the tip (continuous portion). ) May be provided. Then, in the ring bodies of the fourth embodiment and the fifth embodiment, it is possible to obtain the same actions and effects as those of the third embodiment.

  The method for manufacturing the split type sliding ring and the ring body for the split type sliding ring of the present invention are not limited to the configurations of the above-described embodiments, and various modifications can be made.

  For example, the cut groove 40 may be provided in the outer peripheral portions 27b and 37b of the rings 27 and 37. Further, one cut groove 40 may be provided in the inner peripheral portions 27a and 37a, and the other cut groove 40 may be provided in the outer peripheral portions 27b and 37b. Regardless of the position where the cut groove 40 is formed, the load F when dividing the rings 27 and 37 may be applied to the outer peripheral portions 27b and 37b or to the inner peripheral portions 27a and 37a. When the load F is applied to the inner peripheral portions 27a and 37a, the support member 90 is also arranged on the inner peripheral portions 27a and 37a.

  Two or more support members 90 may be arranged for the rings 27 and 37. In this case, the arrangement of the two or more support members 90 is not limited to the position corresponding to the cut groove 40, but can be changed as necessary as long as the rings 27 and 37 can be arranged in a stable state. Further, a pressing member may be used instead of the support member 90, and the loads F may be radially applied to the rings 27 and 37 from two or more positions to divide the rings 27 and 37.

  The formation of the first curved portion 40c and the second curved portion 40d is not limited to laser processing, and can be changed as necessary as long as it is a method capable of forming a curved portion having different curvatures on one surface side and the other surface side. Is. The formation of the auxiliary groove 42 is not limited to cutting work, and may be changed as necessary as long as it is a method capable of forming a groove that is recessed from the first surface to the second surface and penetrates from the inner peripheral portion to the outer peripheral portion. It is possible.

  Of the pair of cut grooves 40, the first curvature radius r1 of the one and the other first bending portion 40c may be different within the above setting range, or the second bending portion 40d of the one and the other second bending portion 40d may be different. The radius of curvature r2 may be different within the above setting range. The second curved portion 40d is formed on the first surfaces 27c and 37c on which the locking grooves 25 and 35 are formed, and the first curved portion 40c is formed on the second surfaces 27d and 37d on which the sliding contact portions 20a and 30a are formed. You may.

  The split slide ring of the present invention is limited to a full split mechanical seal in which all of the seat holder 12, the seat 20, the washer 30, the seal cover 50, the clasp 60, the pusher 70, and the plate 75 are circumferentially divided into two. Instead, only the seat 20, the washer 30, and the seal cover 50 may be used as a mechanical seal divided into two parts. Further, the seat holder 12, the seal cover 50, the clasp 60, the pusher plate 70, and the plate 75 may be used as a mechanical seal (individual), or one of the seat 20 and the washer 30 may be integrated. It may be (non-divided). Moreover, the form of the mechanical seal is not limited to the inside type, and may be the outside type.

DESCRIPTION OF SYMBOLS 1 ... Casing 1a ... Bolt hole 2 ... Rotating shaft 10 ... Mechanical seal 12 ... Sheet holder 13A ... 1st holding member 13B ... 2nd holding member 14 ... Dividing surface 15 ... Set bolt 16 ... Mounting recess 17 ... Pin 20 ... Sheet ( (Split ring)
20a ... Sliding contact surface (sliding contact part)
21A ... 1st rotation member (1st division body)
21B ... Second rotating member (second divided body)
22 ... Dividing surface 23 ... Step portion 24 ... Seal member 25 ... Locking groove 26 ... Ring body (ring body for split type sliding ring)
27 ... Ring 27a ... Inner peripheral portion 27b ... Outer peripheral portion 27c ... First surface 27d ... Second surface 30 ... Washer (divided slide ring)
30a ... Convex portion (sliding contact portion)
30b ... Sliding contact surface 31A ... First fixing member (first divided body)
31B ... Second fixing member (second divided body)
32 ... Dividing surface 33 ... Step portion 34 ... Seal member 35 ... Locking groove 36 ... Ring body (ring body for split type sliding ring)
37 ... Ring 37a ... Inner peripheral portion 37b ... Outer peripheral portion 37c ... First surface 37d ... Second surface 40, 40A, 40B ... Cut groove 40 '... Temporary groove 40a ... Inclined portion 40b ... Continuous portion 40c ... First curved portion 40d ... 2nd curved part 42 ... Auxiliary groove 45 ... Sealing surface 50 ... Seal cover 51 ... Through hole 52 ... Sealing liquid chamber 53A ... 1st cover member 53B ... 2nd cover member 54 ... Dividing surface 55 ... Bolt 60 ... Fastening Gold 61A ... First connecting member 61B ... Second connecting member 62 ... Dividing surface 63 ... Bolt 64 ... Bolt 70 ... Presser 71A ... First pressing member 71B ... Second pressing member 72 ... Dividing surface 73 ... Bolt 75 ... Plate 76A ... 1st plate member 76B ... 2nd plate member 77 ... Dividing surface 80 ... Drive pin 81 ... Locking part 83 ... Coil spring 90 ... Supporting member r1 ... 1st radius of curvature r2 ... 2nd Rate radius F ... load

Claims (7)

A method for manufacturing a split slide ring used for a mechanical seal, comprising:
On the inner peripheral portion or the outer peripheral portion of the annular ring, a notch groove that is recessed in the radial direction of the ring and penetrates from the first surface to the second surface in the axial direction of the ring is provided at intervals in the circumferential direction of the ring. A notch groove forming step which is provided at two places after opening,
A load is applied to the ring from the outer side or the inner side in the radial direction, and the ring is divided into a first division body and a second division body each having an irregularly-shaped division surface starting from the cut groove at both ends. And a dividing process,
In the cutting groove forming step, at the tip of the cutting groove, a first curved portion having a first radius of curvature located toward the first surface, and a second curved surface located at the first surface are provided. A method for manufacturing a split slide ring, which comprises forming a second curved portion having a second radius of curvature smaller than the radius.   The method for manufacturing a split slide ring according to claim 1, wherein a slide contact portion that is in sliding contact with another slide ring is formed on the second surface.   The method for manufacturing a split slide ring according to claim 1, wherein in the cutting groove forming step, the cutting groove is provided at an asymmetrical position of the ring.   Prior to the dividing step, an auxiliary groove is provided near the cut groove on the first surface, the auxiliary groove being recessed from the first surface toward the second surface and penetrating from the inner peripheral portion to the outer peripheral portion of the ring. The method for manufacturing a split slide ring according to claim 1, further comprising a groove forming step. A method for manufacturing a split slide ring used for a mechanical seal, comprising:
On the inner peripheral portion or the outer peripheral portion of the annular ring, a notch groove that is recessed in the radial direction of the ring and penetrates from the first surface to the second surface in the axial direction of the ring is provided at intervals in the circumferential direction of the ring. A notch groove forming step which is provided at two places after opening,
An auxiliary groove forming step of providing an auxiliary groove that is recessed from the first surface toward the second surface and that penetrates from the inner peripheral portion to the outer peripheral portion of the ring in the vicinity of the cut groove of the first surface;
A load is applied to the ring from the outer side or the inner side in the radial direction, and the ring is divided into a first division body and a second division body each having an irregularly-shaped division surface starting from the cut groove at both ends. A method for manufacturing a split type sliding ring, comprising: a splitting step. A ring body for manufacturing a split sliding ring used for a mechanical seal,
Cuts that are provided at two locations on the inner or outer circumference of the annular ring that are spaced apart in the circumferential direction, are recessed in the radial direction of the ring, and penetrate from the first surface to the second surface in the axial direction of the ring. With a slot,
At the tip of the cut groove, a first curved portion having a first radius of curvature located toward the first surface and a second radius of curvature located closer to the second surface and smaller than the first radius of curvature. And a second curved portion of the split type sliding ring annulus. A ring body for manufacturing a split sliding ring used for a mechanical seal,
Cuts that are provided at two locations on the inner or outer circumference of the annular ring that are spaced apart in the circumferential direction, are recessed in the radial direction of the ring, and penetrate from the first surface to the second surface in the axial direction of the ring. Slot and
A split type slide provided with an auxiliary groove that is provided in the vicinity of the cut groove of the first surface, is recessed from the first surface toward the second surface, and penetrates from the inner peripheral portion to the outer peripheral portion of the ring. Ring body for ring.

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