JP5368352B2 - Method for assembling elastic sealing device and assembly jig used therefor - Google Patents

Description

  The present invention protrudes in an axial direction from an annular main body portion and a main body portion between the rotary shaft body and a cylindrical seal flange concentrically inserted therethrough, and elastically extends to the counter peripheral surface. The present invention relates to a method for assembling an elastic seal device loaded with a seal ring made of an elastic material having a cylindrical inner and outer peripheral lip portion that is in press contact, and an assembling jig used for the method.

  As a seal ring device of this type, as disclosed in Patent Document 1, a device used as a channel sealing means in a multi-channel rotary joint is known. That is, the multi-channel rotary joint disclosed in Patent Document 1 includes a seal flange on the front end side (hereinafter referred to as “front end seal flange”), a seal flange on the base end side (hereinafter referred to as “base end seal flange”), and these. A cylindrical case body in which a plurality of seal flanges (hereinafter referred to as “intermediate seal flanges”) arranged in the middle of each other are connected in a stacked manner in the axial direction, and both ends are respectively supported by a distal end seal flange and a proximal end seal flange. A rotating shaft body coupled to the case body so as to be relatively rotatable by being supported, a first flow path formed between each intermediate seal flange (excluding those adjacent to the tip seal flange) and the rotating shaft body; A second flow path formed between the tip seal flange and the rotary shaft body is provided, and each intermediate seal flange and the rotary shaft body serve as sealing means for the first flow path. An elastic seal comprising a mechanical seal device in which a mechanical seal is loaded between the opposed peripheral surfaces of the first seal and an elastic seal ring which is loaded between the tip seal flange and the rotary shaft body as a sealing means for the second flow path. The device is adopted. Such a multi-channel rotary joint is capable of exhibiting a high-level sealing function as a channel sealing means, although it requires a large installation space and a complicated structure, depending on the properties of the fluid flowing in the channel and the flow conditions. Mechanical seal device and sealing function are inferior to mechanical seal device, but installation space is small compared to mechanical seal device and by using an elastic seal device with simple structure, all flow paths are sealed with mechanical seal. Compared with the multi-channel rotary joint (for example, see Patent Document 2), the CMP device is capable of removing a plurality of types of fluids having different properties and flow conditions while simplifying and reducing the size of the multi-channel rotary joint. And the like so as to be able to flow well between the relative rotating members in the above.

JP 2006-161954 A JP 2002-005380 A

  Thus, as disclosed in Patent Document 1, the elastic seal device includes an annular main body portion and a main body portion between the opposed peripheral surfaces of the rotating shaft body and the cylindrical seal flange concentrically inserted therethrough. Is loaded with an elastic seal ring made of a cylindrical inner and outer peripheral lip portion that protrudes in the axial direction and elastically presses and contacts the opposing peripheral surface. By inserting the seal ring into the flange while moving the seal ring in the axial direction, the seal ring is brought into a state where the outer peripheral lip portion is in press contact with the annular seal surface formed on the inner peripheral surface of the seal flange. The seal ring is fitted into the flange, and the seal ring is inserted into the rotating shaft while moving the seal flange with the seal ring fitted in the axial direction thereof. The state-flop portion is pressed into contact with the outer peripheral surface of the rotary shaft is for and a process fitting outer seal ring externally fitted to the rotating shaft.

  By the way, the seal ring made of an elastic material is not loaded between the opposed peripheral surfaces of the tip seal flange and the rotary shaft body (between the seal surface and the outer peripheral surface portion of the rotary shaft body facing the seal surface) ( (Hereinafter referred to as “natural form”) due to its own elasticity and the elasticity of the reinforcing spring loaded between the inner and outer peripheral lip portions, the tip end interval between the inner and outer peripheral lip portions is larger than the radial interval between the opposing peripheral surfaces. ing.

  Therefore, in the seal ring internal fitting step, it is necessary to fit the outer peripheral lip portion into the seal ring in a state where the outer peripheral lip portion is reduced in diameter from the natural form, and in the seal ring external fitting step, The inner peripheral lip portion needs to be inserted into the rotating shaft body in a state in which the inner peripheral lip portion is expanded and deformed from the natural form, but the outer peripheral lip part or the inner peripheral lip part thus forming an annular shape from the natural form If the worker is an unskilled person, the work of loading the seal ring to the seal flange or the work of loading the seal flange to the rotary shaft body while maintaining the reduced diameter or expanded state is possible. Of course, it is extremely difficult even for a skilled person, and it is not easy to properly assemble the elastic seal device.

  That is, the loading operation of the seal ring to the seal flange needs to be performed while the outer peripheral lip portion is held in a state of being reduced in diameter so that the outer diameter is smaller than the diameter of the seal surface which is the seal ring loading surface. However, it is extremely difficult to hold the outer peripheral lip portion having an annular shape in such a reduced diameter deformation state over the entire circumference, and a part of the tip end portion of the outer peripheral lip portion (which forms an annular shape) during the loading operation. (A part in the circumferential direction at the tip) interferes with the insertion side peripheral edge of the seal surface, and the outer peripheral lip portion does not properly press and contact the seal surface. There is a possibility that the reinforcing spring that reinforces the elastic force may be deformed or damaged.

  Such a problem also occurs in the loading operation of the seal flange holding the seal ring onto the rotary shaft body. That is, the work of loading the seal flange onto the rotating shaft body is performed by the outer peripheral surface portion of the rotating shaft body whose inner diameter is the seal ring loading surface (the outer peripheral surface portion of the rotating shaft body facing the seal surface). It is necessary to carry out while maintaining the expanded and deformed state so as to be larger than the outer diameter of the outer diameter, but maintaining the annular inner peripheral lip portion in such a expanded and deformed state over the entire circumference It is extremely difficult, and a part of the tip of the inner peripheral lip part (a part of the annular tip in the circumferential direction) is an end peripheral part of the rotating shaft body (an end part on the seal ring insertion side) during the loading operation. The inner peripheral lip portion does not properly press and contact the outer peripheral surface of the rotating shaft body due to interference with the peripheral edge portion. In extreme cases, the inner peripheral lip portion and the reinforcing spring that reinforces its elastic force are deformed. There is a risk of damage.

  The present invention has been made in view of the above points, and provides an assembling method of an elastic seal device capable of assembling an elastic seal device appropriately and easily regardless of the skill level of an operator. It is an object of the present invention to provide an assembling jig that can suitably carry out the above.

The present invention protrudes in an axial direction from an annular main body portion and a main body portion between the rotary shaft body and a cylindrical seal flange concentrically inserted therethrough, and elastically extends to the counter peripheral surface. A method of assembling an elastic seal device loaded with a seal ring made of an elastic material having a cylindrical inner and outer peripheral lip portion that is in press contact, and inserted into a seal flange while moving the seal ring in the axial direction thereof A seal ring fitting process in which the seal ring is fitted into the seal flange in a state where the outer circumferential lip portion is in press contact with the annular seal surface formed on the inner circumferential surface of the seal flange; By inserting and inserting the seal flange with the seal ring fitted into the body in the axial direction while moving the seal ring, the inner circumferential lip of the seal ring comes into pressure contact with the outer circumferential surface of the rotating shaft body. In the method of assembling an elastic seal device comprising a seal ring external fitting step for externally fitting the rotary shaft body, in order to achieve the above object, in particular, in the seal ring internal fitting step, Cylindrical outer peripheral lip induction treatment having a cylindrical outer peripheral lip guiding surface continuous with the sealing surface on the peripheral surface and an outer peripheral lip contraction deformation working surface gradually expanding from the base end. Install the ingredients, the sealing ring, which is in a state positioned on the outer peripheral lip portion shrink-deformed working plane, by the seal ring main body portion abutting the tubular or rod-pushing jig was on to the seal surface by pushing, while shrink-deformed by the circumferential lip portion diameter reducing deformation working face the circumferential lip portion derived from the outer circumferential lip portion guide surface to the sealing surface, and thereafter, the outer peripheral ripple from the sealing flange The part guide jig is removed, and in the seal ring external fitting process, the inner peripheral lip part guide part having the same outer diameter as the tip of the rotating shaft body and the frustoconical shape gradually reducing the diameter from its base end Alternatively, a rotating body-shaped outer peripheral lip guide jig having a conical inner peripheral lip expanding and deforming portion is attached in a concentric state where the axes coincide with each other, and the seal flange is attached to the seal ring that is fitted and held therein. While the inner peripheral lip portion is expanded, the inner peripheral lip portion is expanded and deformed by the inner peripheral lip portion by moving in the axial direction. It is proposed that the outer peripheral lip guide jig is removed from the rotary shaft body after being guided to a predetermined position of the rotary shaft body.

  In the sealing ring outer fitting step of the assembling method, the jig-side O-ring made of an incompressible elastic material in which the cylindrical centering jig is engaged and held on the inner peripheral portion on the tip side thereof is the inner peripheral lip portion. In the state where the shaft side O-ring made of an incompressible elastic material fitted to the guide jig and engaged and held on the inner peripheral portion of the base end side of the centering jig is fitted to the rotary shaft body, After moving in the axial direction to the position where the inner circumferential lip guiding portion of the circumferential lip guiding jig contacts the tip of the rotating shaft body, the inner circumferential lip guiding jig is attached to the rotating shaft body, The centering jig is preferably detached from the inner peripheral lip part guiding jig and the rotating shaft body so that the inner peripheral lip part guiding jig is attached to the rotating shaft body in a state where the axes coincide with each other.

  In addition, the present invention proposes an outer peripheral lip part guiding jig, an inner peripheral lip part guiding jig, and a centering jig, which are assembling jigs for suitably carrying out the above assembling method. That is, the outer peripheral lip guide jig is formed by forming a cylindrical outer peripheral lip guide surface having the same diameter as the seal surface on the inner peripheral surface and an outer peripheral lip contraction deformation working surface gradually expanding from the base end thereof. The outer peripheral lip portion guide surface can be attached to the seal flange in a state of being flush with the seal surface. In addition, the inner peripheral lip portion guide jig includes an inner peripheral lip portion guide portion having the same outer diameter as the distal end of the rotary shaft body and a frustoconical or conical inner peripheral lip portion expanding diameter gradually decreasing from the base end thereof. It has a diameter deformation action part, and it is constituted so that it can attach to the tip of a rotating shaft object in the concentric state where this and an axis line are in agreement. Further, the centering jig engages and holds a jig-side O-ring made of an incompressible elastic material that can be fitted to the inner circumferential lip portion guiding jig at the distal end side inner circumferential portion, and the proximal end inner circumferential portion. A cylindrical body in which a shaft-side O-ring made of an incompressible elastic material that can be fitted to the rotary shaft body is engaged and held.

  According to the assembling method of the present invention, the use of the outer peripheral lip part guide jig and the inner peripheral lip part guide jig causes the problems described in the beginning of the seal ring inner fitting process and the seal ring outer fitting process. The elastic sealing device can be assembled efficiently and easily and appropriately even when the operator is an expert, as well as when the operator is an expert.

  Moreover, according to the assembling jig of the present invention, the seal ring internal fitting step and the seal ring external fitting step in the assembling method of the present invention can be performed easily and appropriately efficiently.

FIG. 1 is a longitudinal sectional front view showing an example of a multi-channel rotary joint incorporating an elastic seal device assembled by the method according to the present invention (the cross section is taken along the line II in FIG. 4). FIG. 2 is a longitudinal sectional view of the rotary joint (the cross section is taken along the line II-II in FIG. 4). FIG. 3 is a longitudinal side view of the rotary joint (the cross section is taken along the line III-III in FIG. 4). FIG. 4 is a plan view of the rotary joint. FIG. 5 is an enlarged detailed view showing the main part of FIG. FIG. 6 is a partially cutaway plan view showing a preparation step for maintenance work of the elastic seal device in the rotary joint. FIG. 7 is a bottom view of the same. FIG. 8 is a longitudinal sectional view taken along line VIII-VIII in FIG. 9 is a longitudinal sectional view taken along the line IX-IX in FIG. FIG. 10 is a longitudinal sectional view showing a state where the rotary joint is detached from the elastic seal device in the maintenance work (the cross section is along the line XX). FIG. 11 is a longitudinal sectional view corresponding to FIG. 10 showing a repairing process of the rotating shaft body portion of the elastic seal device in the maintenance work. FIG. 12 is a longitudinal sectional view corresponding to FIG. 11 showing a state different from FIG. 11 in the repair process. FIG. 13 is a longitudinal sectional view of a main part corresponding to FIG. 2, showing a start state of the first seal ring fitting process in the assembling method according to the present invention. FIG. 14 is an enlarged view of the main part of FIG. 13 showing the work procedure of the first seal ring fitting process. FIG. 15 is a longitudinal sectional view corresponding to FIG. 13 showing the second seal ring fitting process in the assembling method according to the present invention. FIG. 16 is an enlarged view of the main part of FIG. 15 showing the work procedure of the second seal ring fitting process. FIG. 17 is a partially cutaway longitudinal sectional view corresponding to FIG. 11 showing a seal ring external fitting step in the assembling method according to the present invention. FIG. 18 is an enlarged view of a main part of FIG. 17 showing a work procedure of the seal ring external fitting process. FIG. 19 is a longitudinal sectional view corresponding to FIG. 17 and showing a state different from FIG. 17 in the seal ring external fitting step. FIG. 20 is a longitudinal sectional view corresponding to FIG. 17, showing a state different from FIGS. 17 to 19 in the seal ring external fitting step. FIG. 21 is a longitudinal sectional view corresponding to FIG. 17 and showing a state different from FIGS. 17 to 20 in the seal ring external fitting step. FIG. 22 is a longitudinal sectional view corresponding to FIG. 17 and showing a state different from FIGS. 17 to 21 in the seal ring external fitting step.

  Hereinafter, a method for assembling an elastic seal device according to the present invention and a configuration of an assembling jig used in the method will be specifically described with reference to the drawings.

  FIG. 1 is a longitudinal sectional front view showing an example of a multi-channel rotary joint incorporating an elastic seal device assembled by the method according to the present invention (the cross section is taken along the line II in FIG. 4). FIG. 3 is a longitudinal sectional view of the rotary joint (cross section taken along line II-II in FIG. 4), and FIG. 3 is a longitudinal side view of the rotary joint (cross section taken along line III-III in FIG. 4). 4 is a plan view of the rotary joint, and FIG. 5 is a detailed view showing an enlarged main part of FIG. In the following description, “upper and lower” means the upper and lower sides in FIGS.

  First, the structure of the multi-channel rotary joint will be described. As shown in FIG. 1, the rotary joint is a case body 1 attached to a stationary member (for example, a CMP apparatus main body) of a rotating device and the rotation of the rotating device. A rotating shaft body 2 attached to a side member (for example, a top ring or a turntable of a CMP apparatus), and M first flow paths 3 and N second flow paths 4 between both bodies 1 and 2. The relative rotational connection portion (passage connection space 3a described later) of the first flow path 3 is sealed by the mechanical seal device 5 and the relative rotational connection portion of the second flow path 4 (passage connection described later). The space 4a) is sealed by the elastic sealing device 6. In this example, M = 5 and N = 1.

  As shown in FIGS. 1 to 3, the case body 1 is a cylindrical structure having a circular inner peripheral section, and is formed by stacking and connecting a plurality of cylindrical portions (seal flanges) in the axial direction (vertical direction). . That is, the case body 1 includes a seal flange (hereinafter referred to as “base end seal flange”) 5a constituting the base end portion thereof, and M intermediate seal flanges (the number of the first flow paths stacked on the seal flange 5). (Hereinafter referred to as “first intermediate seal flange”) 5b, a seal flange (hereinafter referred to as “front end seal flange”) 6b constituting the front end of the case body 1, an uppermost first intermediate seal flange 5b and front end seal flange 6b. And an intermediate seal flange (hereinafter referred to as “second intermediate seal flange”) 6a. Each first intermediate seal flange 5b is connected to another first intermediate seal flange 5b and a proximal seal flange 5a adjacent to each other by an appropriate number of bolts 7 (see FIGS. 1 and 2). The second intermediate seal flange 6a is connected to the uppermost first intermediate seal flange 5b by an appropriate number of bolts 8 (see FIG. 1). The distal end seal flange 6b, together with the first and second intermediate seal flanges 5b and 6a, is screwed into the proximal end seal flange 5a by screwing an appropriate number of long bolts 9 inserted therethrough. (See FIG. 2). In addition, at both ends of the case body 1, that is, the lower end of the proximal seal flange 5a and the upper end of the distal end seal flange 6b, as shown in FIG. 2 or FIG. 6c is attached. Further, as shown in FIG. 4, the case body 1 has an external form in which the front and rear surfaces 1a and 1a are circular arc surfaces having the same diameter centered on the rotary shaft 2 and the left and right surfaces 1b and 1b are parallel planes. is there.

  As shown in FIGS. 1 to 3, the rotary shaft body 2 includes a cylindrical shaft main body 11, and end sleeves 12 and M pieces fitted in parallel at a predetermined interval in the axial direction (vertical direction). The intermediate sleeve 13 is supported by the upper and lower bearings 14a and 14b so as to be concentric with the inner peripheral portions of the distal end case portion 6 and the proximal end case portion 5 so as to be rotatable. As shown in FIGS. 1 to 4, the end sleeve 12 is a cylindrical structure body having an H-shaped cross section having a cylindrical seal portion 12a and a disc-like attachment portion 12b. The seal portion 12a is a rotating shaft body. By rotating a suitable number of bolts 15 fitted to the tip portion (upper end portion) of the two shaft main bodies 11 and inserted through the mounting portion 12b to the tip end surface portion (upper end face portion) of the shaft main body 11, a rotating shaft body is obtained. 2 is fitted and fixed to the tip portion. Each intermediate sleeve 13 is a cylindrical body and is fitted into the shaft body 11. The upper bearing 14a is loaded between the opposed peripheral surfaces of the end sleeve 12 and the tip seal flange 6b, and the lower bearing 14b is loaded between the opposed peripheral surfaces of the shaft body 11 and the proximal seal flange 5a. Yes.

  M (five in this example) first flow paths 3 are sealed by a mechanical seal device 5 in which 2M mechanical seals 16 are loaded between the first intermediate seal flange 5b and the rotary shaft body 2. It is a thing. That is, each first flow path 3 is an annular space formed between the opposed peripheral surfaces of the first intermediate seal flange 5b and the rotary shaft 2 as shown in FIG. The sealed passage connection space 3a, the shaft-side passage 3b that passes through the shaft body 11 and each intermediate sleeve 13 of the rotary shaft 2 and communicates with the passage connection space 3a, and the passage that passes through the first intermediate seal flange 5b. The case side passage 3c communicates with the connection space 3a. Each shaft side passage 3b is connected to a flow path formed in the rotation side member of the rotating device, and each case side passage 3c is connected to a flow path formed in the stationary side member of the rotation device. As shown in FIGS. 1 to 3, each mechanical seal 16 is fitted into a shaft-side seal ring (rotary seal ring) 16a fixed to the rotary shaft 2 and a first intermediate seal flange 5b so as to be movable in the axial direction. A case-side sealing ring (stationary sealing ring) 16b, and a spring 16c (see FIG. 2) that presses and urges the case-side sealing ring 16b toward the shaft-side sealing ring 16a. End surface contact configured to shield and seal the passage connection space 3a which is the inner peripheral side region of the relative rotational sliding contact portion and the outer peripheral side region (coolant region described later) by the relative rotational sliding contact action of 16b. This is a mechanical seal. In the mechanical seal device, except for the mechanical seals 16 and 16 located at both upper and lower ends, the shaft-side sealing ring 16a of each mechanical seal 16 and the shaft-side sealing ring 16a of the mechanical seal 16 adjacent thereto are shared. . That is, in the 2M mechanical seals 16, M + 1 shaft-side seal rings 16a are used, and these shaft-side seal rings 16a are connected to adjacent shaft-side seal rings 16a, 16a, 16b, as shown in FIGS. The shaft body 11 is inserted and fixed by being pinched between the seal portion 12a of the end sleeve 12 and the proximal end step portion 11a of the shaft body 11 with the intermediate sleeve 13 interposed between the shaft bodies 16a. . As shown in FIGS. 1 to 3, the case side sealing rings 16 b and 16 b of the adjacent mechanical seals 16 and 16 are fitted and held on the inner peripheral portion of the first intermediate seal flange 5 b so as to be movable in the axial direction. As shown in FIG. 3, each case-side sealing ring 16b is allowed to move in the axial direction by engaging a recess formed in its outer peripheral portion with a common drive bar 17 penetratingly held by the first intermediate seal flange 5b. However, relative rotation with respect to the case body 1 (base end case portion 5) is prevented. As shown in FIG. 2, the two case-side sealing rings 16b and 16b fitted and held in each first intermediate seal flange 5b are inserted and held in through holes formed in the first intermediate seal flange 5b. The springs 16c loaded between the side sealing rings 16b and 16b are pressed in contact with the mating sealing rings 16a and 16a by urging them in directions away from each other.

  In this way, each first flow path 3 is formed by connecting the shaft side passage 3b and the case side passage 3c so as to be relatively rotatable by the passage connection space 3a, and each passage connection space 3a is a pair of mechanical seals. 16 and 16, the M first flow paths 3b make it possible to use M types of first fluids that require a high degree of sealing performance (for example, pure water and chemicals used in CMP apparatuses). , Polishing liquid, slurry liquid, etc.) 18 can be made to flow independently between the two bodies 1 and 2 without leakage.

  In addition, as shown in FIG. 2, the outer peripheral side region of the seal portion of the mechanical seal 16 (the relative rotational sliding contact portion of both seal rings 16a and 16b) is inserted and held in the through hole (spring 16c) of the first intermediate seal flange 5b. A ring made of an elastic material that is in communication with each other through the through-holes and is fitted and fixed to the inner peripheral portions of the seal flanges 5a and 6a and pressed against the outer peripheral surfaces of the lowermost and uppermost shaft-side seal rings 16a and 16a. A coolant region is sealed by seal members (for example, oil seals) 19a and 19b, and a coolant (for example, a coolant) is formed by supply and discharge fluid paths 20 and 21 formed in the proximal seal flange 5a and the second intermediate seal flange 6a. , Normal temperature clean water, pure water, etc.) 22 is circulated and supplied. It is devised to cool the seal portion of each mechanical seal 16 with this coolant to prevent abnormal heat generation and wear of the seal portion as much as possible.

  The N (one in this example) second flow path 4 has an elastic seal device 6 in which first and second seal rings made of an elastic material are loaded between the tip seal flange 6 b and the rotary shaft body 2. It is sealed by. That is, as shown in FIG. 1, the second flow path 4 is an annular space formed between the opposed peripheral surfaces of the rotary shaft bodies 2 and the tip seal flange 6b, and has the same shape as the first and second seal rings. A passage connecting space 4a sealed by the passages 23 and 24; a shaft side passage 4b formed in the rotary shaft 2 and communicating with the passage connecting space 4a; and a case formed in the tip seal flange 6b and communicating with the passage connecting space 4a. Containing a side passage 4c that allows a second fluid 25 (for example, wafer pressurization air or air blow air used in a CMP apparatus) to flow between the two bodies 1 and 2 that does not require a high degree of sealing performance. It is. As shown in FIG. 1, the shaft-side passage 4b passes through the seal portion 12 of the shaft body 11 and the end sleeve 12, and is opened to the passage connection space 4a. The case-side passage 4c is formed as shown in FIG. The distal end seal flange 6b passes through in the radial direction and is opened to the passage connection space 4a. As shown in FIG. 5, a bearing holding surface 6d for internally fitting and holding a bearing 14a and a pair of upper and lower seal rings positioned below that and having a smaller diameter than the bearing holding surface 6d are provided on the inner peripheral surface of the tip seal flange 6b. Seal surfaces 6e and 6f which are loading surfaces and an annular partition 6g projecting inward from between both seal surfaces 6e and 6f are formed, and the case side passage 4c passes through the partition 6g. Opened in the connection space 4a. Further, a step portion is formed at the boundary between the bearing holding surface 6d and the upper seal surface 6e, and an annular bearing receiver 26 for receiving the lower surface portion of the upper bearing 14a is abutted and locked to the step portion. Yes.

  As shown in FIG. 5, each seal ring 23, 24 includes an annular main body 27, cylindrical inner and outer peripheral lip portions 28, 29 protruding from the main body portion 27 in the axial direction, and inner and outer peripheral lip portions 28, 29. A circular spring having a substantially U-shaped cross section comprising a reinforcing spring (a leaf spring having a substantially U-shaped annular section) 31 loaded in an annular groove 30 formed on the rotating shaft body 1 and the tip It is loaded between the opposed peripheral surfaces of the case portion 6, that is, between the seal portion 12a of the end sleeve 12 and the seal surfaces 6e and 6f which are the inner peripheral portions of the tip seal flange 6b. As shown in FIG. 5, the thickness of the main body 27 in the radial direction is between the opposing peripheral surface portions of the rotating shaft 1 and the tip case portion 6 (the seal portion 12a of the end sleeve 12 and the seal surface 6e of the tip seal flange 6b, 6f) and can be easily inserted / removed between the opposed peripheral surface portions. On the other hand, the inner and outer peripheral lip portions 28 and 29 have their own elasticity and the elasticity of the reinforcing spring 31, and in a state in which they are not loaded between the opposing peripheral surface portions (natural state), the distance between the opposing peripheral surface portions in the distal direction. It spreads in the shape of C. That is, in the natural state, as shown by a chain line in FIG. 5, the inner peripheral lip portion 28 protrudes from the main body portion 27 in the inner peripheral direction, and the outer peripheral lip portion 29 protrudes from the main body portion 27 in the outer peripheral direction. That is, as shown in FIG. 5, both seal rings 23, 24 are arranged in a symmetrical form with the openings of the annular grooves 30, 30 facing each other vertically, and the upper first seal ring 23 is the upper seal ring. Inner and outer peripheral lip portions 28 and 29 are formed in an annular recess formed by the surface 6e and the partition portion 6g projecting inwardly and the inner peripheral portion of the bearing receiver 26, and the seal portion 12a and the seal surface of the end sleeve 12 It is fitted and held in a state where it is elastically pressed against 6e. Further, as shown in FIG. 5, the lower second seal ring 24 is surrounded by the lower seal surface 6f, the partition portion 6g projecting inwardly therefrom, and the inner peripheral portion of the second seal flange 26. The inner and outer peripheral lip portions 28 and 29 are fitted and held in the annular recess in a state where they are elastically pressed against the seal portion 12a and the seal surface 6f of the end sleeve 12.

  Thus, when the second fluid 25 is supplied to the passage connection space 4a, the second fluid 25 flows into the annular grooves 30 and 30 of the seal rings 23 and 24, and in the axial direction due to the pressure of the fluid 25. The seal rings 23 and 24 are pressed in a direction away from each other, and the main body portions 27 and 27 are pressed against the bearing receiver 26 and the second intermediate seal flange 6a. The circumferential lip portions 28 and 29 are pressed and deformed in the direction in which the radial interval increases. That is, due to the pressure of the second fluid 25 flowing into the annular groove 30, the contact surface pressure of the lip portions 28, 29 to the seal surfaces 6 e, 6 d, 12 a rises, and the sealing function by the seal rings 23, 24 is sufficient. Demonstrated. The degree of increase in the contact surface pressure is proportional to the pressure of the second fluid 25 supplied to the passage contact space 4a. Therefore, the contact surface pressure, that is, the sealing force changes proportionally according to the pressure of the second fluid 25, and the seal rings 23, 24 also when the second fluid 25 is at a high pressure or when the pressure fluctuates. Thus, the sealing function is properly and satisfactorily exhibited, and the flow of the second fluid 25 in the second flow path 4 is favorably performed without causing leakage.

  By the way, in such a multi-channel type rotary joint, the mechanical seal 16 exhibits a sealing function by two sealing rings 16a and 16b made of a hard material such as ceramics, carbon, cemented carbide or the like. Although it does not require maintenance for a long period of time, the seal rings 23 and 24 made of an elastic material are easily worn and damaged in short-term use due to their materials and functions, and need to be replaced. Therefore, in the multi-channel rotary joint that uses the mechanical seal device 5 and the elastic seal device 6 as the sealing means for the channels 3 and 4 as described above, when the mechanical seal device 5 does not need to be maintained. In addition, the elastic seal device 6 performs maintenance (replaces the seal rings 23, 24 with new ones, and replaces and repairs peripheral members (for example, the end sleeve 12) of the seal rings 23, 24 as necessary. In this embodiment, in the maintenance work of the elastic seal device 6, the method of the present invention is applied when the disassembled elastic seal device 6 is assembled (reassembly of the elastic seal device 6). According to the applied example.

  Thus, in the multi-channel rotary joint configured as described above, maintenance of the elastic seal device 6 (replacement of the seal rings 23 and 24 and reassembly of the elastic seal device 6) is as follows. It is performed by a process, a disassembly process (including a seal ring internal fitting process and a seal ring external fitting process by the method of the present invention), a reassembly process, and a final process.

(Preparation process)
The mechanical seal 16 is configured so as to exhibit a high degree of sealing function by the relative rotation of the sealing end faces as opposed end faces of both sealing rings 16a and 16b in parallel and concentric states. If the concentricity is impaired, the sealing function is reduced or lost. However, if the tip seal flange 6a is removed during the maintenance of the elastic seal device 6, the bearing support of the upper end portion (tip portion) of the rotary shaft body 2 by the bearing 14a loaded therebetween is released. Since the rotary shaft body 2 is in a cantilever state in which only the lower end portion (base end portion) is connected to the base end seal flange 5a by the bearing 14b, the rotary shaft body 2 is in a state of being rotatable relative to the case body 1. When reassembling the elastic sealing device 6, the base end side portion of the case body 1 that is not disassembled (the portion constituted by the base end seal flange 5a, the entire first intermediate seal flange 5b, and the cover plate 5c, Hereinafter, the concentric state of the non-disassembled case body portion and the rotating shaft body 2 is not maintained, that is, it is difficult to maintain the state before the elastic seal device 6 is removed (disassembled). There, as a result, there is a possibility that parallelism of the sealing end face as described above, concentricity is impaired. Such a fear becomes conspicuous as the number of mechanical seals 16 arranged in parallel in the axial direction increases. Further, since the non-disassembled case body portions 5a, 5b and 5c and the rotary shaft body 2 are in a relatively rotatable state, that is, the rotary shaft body 2 is unstable because only the base end portion thereof is supported by the bearing 14b. Since it is in a cantilever state, it is extremely difficult to reassemble the elastic seal device 6, and the mechanical seal device 5 can be used by a skilled worker as well as an unskilled worker. It is not easy to perform maintenance work or reassembly work of the elastic seal device 6 while maintaining an appropriate form before maintenance.

  Therefore, when performing maintenance of the elastic seal device 6, as a preparatory step, as shown in FIGS. 6 to 9, a non-disassembled case body portion 5a, 5b, 5c and the rotary shaft body 2 are connected and fixed using a jig 40. Thus, they are connected so that they cannot rotate relative to each other.

  As shown in FIGS. 6 to 9, the connection fixing jig 40 is a metal bottomed cylinder having a disk-shaped shaft fixing portion 41 and a cylindrical case fitting portion 42 erected on the peripheral edge thereof. In the portion on the diameter line, a notch groove 44 that divides both portions 41 and 42 into two portions is formed in the portion on the diameter line. The case fitting portion 42 has a necessary and sufficient inner diameter (substantially the same as the front and rear surfaces 1a and 1a of the case body 1) to fit the base end portion of the case body 1, that is, the base end seal flange 5a (cover plate 5c). The diameter can be reduced by tightening a plurality of connecting bolts 45 that connect the divided ends facing each other with the notch groove 44 interposed therebetween. A plurality of arc-shaped elongated holes 41a are formed in the shaft fixing portion 41, and each arc-shaped elongated hole 41a is screwed into a screw hole 11b (see FIGS. 2 and 10) formed in the lower end surface portion of the shaft body 11. A fixing bolt 46 that can be worn is inserted.

  Thus, in the preparation process, first, the base end seal flange 5a is fitted to the case fitting portion 42, and then the connecting bolt 45 is tightened to reduce the diameter of the case fitting portion 42. The lower end portions of the disassembled case body portions 5a, 5b, and 5c are fitted and fixed to the case fitting portion 42 so as not to be relatively rotatable. Next, each fixing bolt 46 is screwed into the screw hole 11 b of the shaft body 11, and the rotating shaft body 2 is fixed to the shaft fixing portion 41 so as not to be relatively rotatable. By doing so, the non-disassembled case body portions 5a, 5b, 5c and the rotating shaft body 2 are integrally connected via the connection fixing jig 40 so as not to be relatively rotatable.

(Disassembly process)
Next, a disassembling process is performed, and the elastic seal device 6 is disassembled. In this disassembling process, first, the connection fixing jig 40 is placed on a predetermined work surface (such as the upper surface of the work table). The multi-channel rotary joint is held upright. By doing in this way, the said decomposition | disassembly process and the reassembly process after a drought can be performed easily.

  In the disassembling process, first, as shown in FIG. 10, the tip side portions 6a, 6b, 6c of the case body 1 are removed from the non-disassembling case body portions 5a, 5b, 5c. That is, the cover plate 6c and the long bolt 9 are removed, the tip seal flange 6b is removed from the second intermediate seal flange 6a, and the bearing 14a, the bearing receiver 26, and the seal rings 23 and 24 are connected to the end of the rotary shaft body 2. Pull out from the sleeve 12. Further, the bolt 8 is removed, and the second intermediate seal flange 6a and the annular seal member 19a are removed.

  By the way, in the disassembling process, the upper bearing 14a is removed from the case body 1, so that the rotary shaft body 2 is only supported by the non-disassembling case body portions 5a, 5b, 5c by the lower bearing 14b. In the preparation process, the rotating shaft body 2 is integrated with the non-disassembled case body portions 5a, 5b, and 5c by the connection fixing jig 40, that is, the rotating shaft body 2 is held in a state before the preparation process. Therefore, the positional relationship between the rotary shaft body 2 and the non-disassembled case body portions 5a, 5b, and 5c does not change due to the removal work of the tip seal flange 6b and the like. Accordingly, during the disassembling process, each mechanical seal 16 incorporated between the rotary shaft body 2 and the first intermediate seal flange 5b reduces the function thereof (for example, the rotary shaft body 2 wobbles). Thus, the parallelism and concentricity of the sealing rings 16a and 16b are not changed), and the form before maintenance is maintained as it is. Further, since the relative rotation between the rotating shaft body 2 and the non-disassembled case body portions 5a, 5b, 5c is prevented by the connecting and fixing jig 40, the rotating shaft body 2 does not rotate during the operation. The decomposition process can be easily performed. It should be noted that the top mechanical seal 16 and the like are not removed by removing the tip side portions 6a, 6b and 6c of the case body 1 and the members (bearing 14a and the like) loaded between the front end portions 6a, 6b and 6c and the rotary shaft body 2. Although exposed from the disassembling case body portions 5a, 5b, 5c, in the disassembling step, these exposed portions (for example, the outer peripheral surface of the uppermost shaft-side sealing ring 16a to which the annular seal member 19a is pressed) are cleaned. preferable.

(Reassembly process)
When the disassembly process is completed, the reassembly process is started, and the rotary joint is reassembled including maintenance and reassembly of the elastic seal device 6 as shown in FIGS.

  First, the end sleeve 12 is replaced. That is, the outer peripheral surface of the end sleeve 12, that is, the outer peripheral surface of the seal portion 12a with which the seal rings 23 and 24 come into contact, is easily damaged, and if left untreated, the seal rings 23 and 24 are replaced with new ones. However, since the sealing function by the seal rings 23 and 24 is not satisfactorily exhibited, the end sleeve 12 is replaced with a new one before the replacement of the seal rings 23 and 24 in the reassembly process. Note that the replacement of the end sleeve 12 is performed as necessary, and the end sleeve 12 may not be replaced when there is no problem such as damage.

  By the way, the shaft side seal ring group (M + 1 shaft side seal rings 16a) includes the seal portion 12a of the end sleeve 12 and the shaft main body with the intermediate sleeve 13 interposed between the adjacent shaft side seal rings 16a, 16a. 11 is inserted into and fixed to the shaft body 11 by being sandwiched between the base end step portion 11a and is urged in the axial direction by the case-side sealing ring 16a by the spring 16c. Therefore, when the end sleeve 12 is replaced, the position of the shaft-side sealing ring 16a varies. As a result, when the new end sleeve 12 is attached to the shaft body 11, the relative positions of the sealing rings 16a and 16b are changed. May not be restored to the original proper position.

  However, by using the following sealing ring locking jig 50, the end sleeve 12 can be easily replaced without causing such a problem.

  That is, when exchanging the end sleeve 12, as shown in FIG. 11, the sealing ring locking jig 50 for detachably surrounding the end sleeve 12 in the axial direction is provided in advance as the uppermost first intermediate seal flange. The shaft-side sealing ring (the most distal (uppermost) shaft-side sealing ring) 16a that is secured to the end sleeve 12 by this sealing ring locking jig 50 is attached to the end sleeve 12. It is locked at the same position as the locking position.

  As shown in FIG. 11, the sealing ring locking jig 50 includes a bottomed cylindrical jig main body 51 attached to the upper end of the uppermost first intermediate seal flange 5b, and a peripheral wall 51a of the jig main body 51. The ring-shaped locking body 52 is inserted in the axial direction (vertical direction) so as to be movable, and the adjustment bolt 53 is screwed into the end wall 51b of the jig body 51 in a penetrating manner. The peripheral wall 51a is formed with a through hole 51c corresponding to the insertion hole for the long bolt 9 formed in the base end case portion 5, and the mounting bolt 54 inserted through the through hole 51a is attached to the long bolt 9 ( The jig main body 51 is attached to the upper ends of the non-disassembled case body portions 5a, 5b, and 5c by screwing the base end seal flange 5a in the same manner as in FIG. As described above, the sealing ring locking jig 50, that is, the jig main body 51 includes the insertion hole and the screw hole of the long bolt 9 that connects the distal end side portions 6a and 6b and the proximal end side portions 5a and 5b of the case body 1. Are attached to the non-disassembled case body portions 5a, 5b, 5c by the same mounting bolt 54 as the long bolt 9. A through hole larger than the outer diameter of the end sleeve 12 (the outer diameter of the seal portion 12a) is formed in the center portion of the end wall 51b and the locking body 52, and the sealing ring locking jig 50 is not attached. The end sleeve 12 can be inserted into and removed from the upper end portion of the shaft body 11 in a state where the end sleeve 12 is attached to the disassembled case body portions 5a, 5b and 5c. Further, the adjusting bolt 53 is disposed at a position where it can come into contact with the upper end portion of the locking body 52. By tightening the adjustment bolt 53, the locking body 52 is brought into contact with the upper end surface of the uppermost shaft-side sealing ring 16a. It has become possible.

  Thus, the jig main body 51 of the sealing ring locking jig 50 is attached to the non-disassembled case body portions 5a, 5b, 5c by the mounting bolt 54, and the adjusting bolt 53 is tightened to fix the locking body 52 to the uppermost position. By abutting against the shaft-side sealing ring 16a, the shaft-side sealing ring 16a can be locked and held at the same position as the locking position by the end sleeve 12, as shown in FIG.

  In this state, as shown in FIG. 12, the bolt 15 is removed, the end sleeve 12 is extracted from the shaft main body 11, and a new end sleeve 12 is attached to the shaft main body 11. In such a replacement operation of the end sleeve 12 (insertion / removal operation of the end sleeve 12 with respect to the shaft main body 11), the uppermost shaft-side seal ring 16 a is moved by the end sleeve 12 by the seal ring locking jig 50. Since it is locked and held at the same position as the locking position, there is no problem that the relative positions of the sealing rings 16a and 16b change when the end sleeve 12 is replaced.

  When the replacement of the end sleeve 12 is finished, that is, when the attachment of the new end sleeve 12 to the shaft body 11 is finished, the sealing ring locking jig 50 is removed from the base end case portion 5 and then the annular seal is removed. The second intermediate seal flange 6a loaded with a new annular seal member 19a is attached to the non-disassembled case body portions 5a, 5b, 5c by bolts 8 (see FIG. 1) while replacing the member 19a. The replacement of the annular seal member 19a is performed as necessary, and the annular seal member 19a may not be replaced when no damage or deterioration is observed.

  When the replacement of the end sleeve 12 and the annular seal member 19a is thus completed, the elastic seal device 6 is subsequently reassembled. This reassembly is performed as follows according to the method of the present invention.

  That is, according to the present invention, the seal rings 23 and 24 are inserted into the tip seal flange 6b while moving the seal rings 23 and 24 in the axial direction thereof, so that the outer peripheral lip portions 29 and 29 of the seal rings 23 and 24 have the tip seal flange 6b. The outer ring lip guide jigs 60 and 61 according to the present invention include a seal ring fitting process for fitting the tip seal flange 6b in a state of being pressed and contacted with the annular seal surfaces 6e and 6f formed on the inner circumferential surface. And the pushing jig 62 is used as follows.

  First, the first seal ring 23 is loaded into the tip seal flange 6b. In this loading, as shown in FIG. 13, the first outer peripheral lip guide jig 60 is fitted to the bearing holding surface 6d of the tip seal flange 6b. Fix it. The first outer peripheral lip portion guiding jig 60 has an outer peripheral lip portion guiding surface 60a which is a cylindrical surface continuous with the seal surface 6e on the inner peripheral surface and an outer peripheral lip which is a frustoconical surface gradually expanding from the base end thereof. It is a cylindrical thing formed by forming the partial diameter-reducing deformation surface 60b.

  Then, as shown in FIG. 13, the first seal ring 23 is inserted into the outer peripheral lip portion diameter-reducing deformation acting surface 60b, and then pushed into the outer peripheral lip portion guiding surface 60a by the pushing jig 62 abutted against the main body portion 27. Push in. The pushing jig 62 has a cylindrical shape or a rod shape (cylindrical shape in the illustrated example) having substantially the same outer diameter as the sealing surfaces 6e, 6f, and is detachable from the sealing surfaces 6e, 6f.

  When the first seal ring 23 is pushed in by the push-in jig 62, first, the outer peripheral lip portion 29 comes into contact with the outer peripheral lip portion diameter reducing deformation surface 60b (FIG. 14A), and this outer peripheral lip portion diameter reducing deformation is performed. The diameter is reduced while sliding on the working surface 60b. That is, the outer peripheral lip portion 29 is gradually elastically deformed (diameter-reduced deformation) in the inner diameter direction by the outer peripheral lip portion diameter-reducing action surface 60b. When the pushing by the pushing jig 62 proceeds, the outer peripheral lip portion 29 slides from the outer peripheral lip portion diameter-reducing deformation acting surface 60b to the outer peripheral lip portion guiding surface 60a, and is elastically deformed into a form that can be loaded on the seal surface 6e. (Diameter deformation) (FIG. 14B). Then, the outer peripheral lip portion 29 is moved from the outer peripheral lip portion guiding surface 60a to the seal surface 6e while maintaining this form (FIG. 14C), and is pushed in when the outer peripheral lip portion 29 comes into contact with the partition portion 6g. The pushing of the seal ring 23 by the jig 62 is completed ((D) in the figure). As described above, the outer peripheral lip 29 is gradually reduced in diameter by the first outer peripheral lip guiding jig 60, and the seal ring 23 is pushed into the seal surface 6e so that the seal ring 23 is properly fitted to the tip seal flange 6b. Can be loaded in various forms. Since the outer peripheral lip portion guide surface 60a is flush with the seal surface 6e, the tip of the outer peripheral lip portion 29 is smoothly guided from the outer peripheral lip portion guide surface 60a to the seal surface 6e, and the seal surface 6e There is no interference with the peripheral edge 6h.

  Next, the first outer peripheral lip guide jig 60 is removed and the tip seal flange 6b is turned upside down, and then, as shown in FIG. 15, the second intermediate seal flange 6a formed at the upper end of the tip seal flange 6b. The second outer peripheral lip guide jig 61 is fitted and fixed to the engaging protrusion 6j. As shown in FIG. 15, the second outer peripheral lip guide jig 61 has a cylindrical shape that is continuous with the seal surface 6f of the tip seal flange 6b on the inner peripheral surface in the same manner as the first outer peripheral lip guide jig 60. The outer peripheral lip portion guiding surface 61a and the frustoconical outer peripheral lip portion diameter-reducing deformation acting surface 61b that gradually expands from its base end are formed in a cylindrical shape.

  Then, as shown in FIG. 15, the second seal ring 24 is inserted into the outer peripheral lip portion diameter-reducing deformation acting surface 61b, and then pushed into the outer peripheral lip portion guiding surface 61a by the pushing jig 62 abutted against the main body portion 27. Push in. When the second seal ring 24 is pushed in by the pushing jig 62, the outer peripheral lip portion 29 comes into contact with the outer peripheral lip portion diameter-reducing deformation acting surface 61b as in the case of loading the first seal ring 23 (see FIG. 16 (A)), after sliding, the diameter is reduced while sliding on the outer peripheral lip portion diameter reducing action surface 61b, and by sliding to the outer peripheral lip portion guide surface 60a, the seal surface 6e can be loaded. It is elastically deformed (diameter-reduced deformation) (FIG. (B)) and is moved from the outer peripheral lip portion guiding surface 60a to the seal surface 6e while maintaining its form (FIG. (C)), and the outer peripheral lip portion 29 is partitioned. At the point of contact with the portion 6g, the pushing of the seal ring 23 by the pushing jig 62 is finished ((D) in the figure).

  As described above, by using the first and second outer peripheral lip guide jigs 60 and 61 and the pushing jig 62, the seal ring fitting process can be easily and appropriately performed. That is, the new seal rings 23 and 24 can be loaded into a predetermined position (seal surfaces 6e and 6f) of the tip seal flange 6b in an appropriate form. It is smoothly guided from the part guide surfaces 60a, 61a to the seal surfaces 6e, 6f and does not interfere with the peripheral portions 6h, 6i of the seal surfaces 6e, 6f.

  Next, according to the present invention, the seal ring 23, 24 is inserted into the rotary shaft body 2 by moving and inserting the tip seal flange 6b having the seal rings 23, 24 fitted in the axial direction thereof. The inner ring lip guide jig 70 according to the present invention is used for a seal ring outer fitting process in which the outer lip portions 28 and 28 are pressed and contacted with the outer peripheral surface of the rotary shaft body 2. Then do as follows.

  First, as shown in FIG. 17, an inner peripheral lip guide jig 70 is attached to the tip (upper end) of the end sleeve 12. As shown in FIG. 17, the inner peripheral lip portion guiding jig 70 includes a cylindrical inner peripheral lip portion guiding portion 71 having the same outer diameter as the outer diameter of the end sleeve 12 (the outer diameter of the seal portion 12a) and its base. A rotating body shape having a frustoconical (or conical) inner peripheral lip diameter-expanding deformation working portion 72 that gradually decreases in diameter from the end and a columnar centering portion 73 that projects concentrically from the base end. The mounting bolt 75 inserted through the central through hole 74 is screwed into the screw hole 12c formed at the center of the mounting portion 12b of the end sleeve 12, so that the upper end portion of the end sleeve 12 is connected to this. It is attached in a state where the axes are aligned (a concentric state in which the outer peripheral surface 71a of the inner peripheral lip portion guiding portion 71 is continuous with the outer peripheral surface of the end sleeve 12, that is, the outer peripheral surface of the seal portion 12a). Note that the outer diameter of the centering portion 73 and the outer diameter of the proximal end portion (upper end portion) of the inner peripheral lip portion diameter-expanding deformation working portion 72 (the minimum diameter of the inner peripheral lip portion diameter-expanding deformation acting portion 72) are in a natural state. Is set smaller than the inner diameter of the inner peripheral lip portions 28, 28 of the elastic material seal rings 23, 24. The outer diameter of the centering portion 73 is set to be the same as or smaller than the minimum diameter of the inner peripheral lip portion diameter-expanding deformation working portion 72.

  Next, the tip seal flange 6b is positioned so that the elastic material seal rings 23, 24 held on the inner peripheral portion thereof are inserted into the upper end portion of the inner peripheral lip portion guiding jig 70, and then lowered. Go (Figure 17).

  When the tip seal flange 6b is lowered, first, the inner peripheral lip portion 28 of the lower second seal ring 24 is moved to the outer peripheral surface of the inner peripheral lip portion expanding deformation working portion 72 (hereinafter referred to as “inner peripheral lip portion enlarged diameter”). (Referred to as “deformation acting surface”) 72a (FIG. 18A), and the diameter is increased while sliding on the inner circumferential lip diameter-enlarging deformation acting surface 72a. That is, the inner peripheral lip portion 28 is gradually elastically deformed (expanded deformation) in the outer diameter direction by the inner peripheral lip portion diameter-expanding deformation acting surface 72a.

  As the tip seal flange 6b descends, the elastic deformation of the inner peripheral lip portion 28 of the second seal ring 24 by the inner peripheral lip portion diameter-expanding deformation working surface 72a further increases. It becomes maximum when the lip portion 28 reaches the lower end of the inner peripheral lip portion diameter-expanding deformation acting surface 72a, and after that, the outer peripheral surface of the inner peripheral lip portion guiding portion 71 (hereinafter referred to as "inner peripheral lip" is maintained while maintaining its deformed form. (Referred to as “part guide surface”) 71a (FIG. 18B).

  When the inner peripheral lip portion 28 of the second seal ring 24 advances on the inner peripheral lip portion guiding surface 71a, the inner peripheral lip portion 28 of the upper first seal ring 23 is also deformed to expand the inner peripheral lip portion. The diameter is gradually increased and deformed by the action surface 72a, and the inner peripheral lip portion diameter-expanding deformation surface 72a is shifted from the lower end portion to the inner peripheral lip portion guiding surface 71a while maintaining the maximum diameter-reduced form (FIG. 18A). ) To (C)).

  Further, as the tip seal flange 6b is lowered, the inner peripheral lip portions 28, 29 of the seal rings 23, 24 are changed from the inner peripheral lip portion guide surface 71a to the outer peripheral surface of the seal portion 12a that is flush with the inner peripheral lip portion. The transition is made sequentially (FIG. 18D). Therefore, both the seal rings 23 and 24 are smoothly and satisfactorily guided to the end sleeve 12 without the inner peripheral lip portion 28 interfering with the peripheral edge of the end portion of the rotary shaft body 2.

  When the tip seal flange 6b is lowered to a position where it abuts against the second intermediate seal flange 6a, both seal rings 23, 24 are inserted into predetermined positions of the end sleeve 12 as shown in FIG. The rings 23 and 24 are loaded so that the passage connection space 4a can be properly sealed.

  When the seal ring external fitting process is completed in this way, as shown in FIG. 20, the front end seal flange 6b and the seal flange 6a are connected to the base end case part 5 by the long bolt 9, and the bolts between both the flanges 6a and 6b are connected. 8 (see FIG. 1), and a bearing receiver 26 and a bearing 14a are loaded between the opposing peripheral surfaces of the tip seal flange 6b and the end sleeve 12. Thereafter, the cover plate 6c is attached to the tip seal flange 6b with the screw 10b (see the chain line in FIG. 20), and the reassembly operation of the elastic seal device 6 is completed.

  Incidentally, in order to smoothly and properly fit the inner peripheral lip portions 28, 28 of the seal rings 23, 24 into the end sleeve 12 by the inner peripheral lip portion guide jig 70, the inner peripheral lip portion guide jig 70 is used. Must be attached to the end sleeve 12 in a state where the axis coincides with the end sleeve 12 (a concentric state in which the inner peripheral lip guide surface 71a is continuous with the outer peripheral surface of the end sleeve 12). It is necessary to tighten the mounting bolt 75 in a state where the end portions of the 12, 70 are abutted with each other accurately in a concentric state. Is extremely difficult.

  However, such an operation can be easily performed by using a centering jig 80 according to the present invention as shown in FIGS.

  That is, as shown in FIG. 21, the centering jig 80 includes a first cylindrical portion 81, a second cylindrical portion 82 connected to the base end portion (lower end portion), and a third cylinder connected to the base end portion (lower end portion). The first and second cylindrical portions 81 and 82 are fitted to the outer peripheral surface of the inner peripheral lip portion guiding jig 70 on the inner peripheral portion of the distal end side, that is, the first and second cylindrical portions 81 and 82. The second jig-side O-rings 84 and 85 are engaged and held, and the base-side inner peripheral portion, that is, the inner peripheral portion of the third cylindrical portion 83, is fitted on the outer peripheral surface of the rotary shaft 2. The ring 86 is held engaged. The first cylindrical portion 81 is in a state in which the first jig side O-ring 84 engaged and held in the inner peripheral annular groove is elastically pressed against the outer peripheral surface of the centering portion 73 of the inner peripheral lip portion guiding jig 70. Thus, the centering portion 73 can be fitted and held. In the second cylindrical portion 82, the second jig side O-ring 85 engaged and held in the inner peripheral annular groove is elastically applied to the outer peripheral surface 71 a of the inner peripheral lip portion guiding portion 71 of the inner peripheral lip portion guiding jig 70. The inner peripheral lip portion inducing jig 70 can be fitted and held in the inner peripheral lip portion expanding deformation working portion 72 and the inner peripheral lip portion guiding portion 71 in a state of being pressed against the inner peripheral lip portion. The third cylindrical portion 83 has the same inner and outer diameter as the second cylindrical portion 81, and the shaft-side O-ring 86 engaged and held in the inner peripheral annular groove is the outer peripheral surface of the end sleeve 12 (the seal portion 12a). It can be fitted into the end sleeve 12 while being elastically pressed against the outer peripheral surface. Each O-ring 84, 85, 86 is made of an incompressible elastic material such as rubber.

  Thus, the inner peripheral lip guide jig 72 is attached to the end sleeve 12 as follows. That is, first, as shown in FIG. 21, first and second jig side O-rings 84 and 85 are fitted to the inner peripheral lip part guiding jig 72 and the centering part 73 and the inner peripheral lip part guiding part 71, respectively. Centering treatment is performed so that the first and second jig-side O-rings 84 and 85 are elastically pressed against the outer peripheral surfaces of the centering portion 73 and the inner peripheral lip portion guiding portion 71, respectively. After the fitting 80 is inserted, the third cylindrical portion 83 protruding from the inner peripheral lip portion guiding portion 71 is in a state where the shaft-side O-ring 86 is fitted to the end sleeve 12 (the shaft-side O-ring 86 is the seal portion). 12a, the end sleeve 12 is inserted into the end sleeve 12 so as to be in a state of being elastically pressed against the outer peripheral surface of 12a. Then, in this state, the centering jig 80 is pushed toward the lower end of the end sleeve 12 until the inner peripheral lip guide 71 held by the centering jig 80 abuts the end sleeve 12. In this state, the jig-side O-rings 84 and 85 and the shaft-side O-ring 86 made of an incompressible elastic material held on the inner peripheral portion of the centering jig 80 are the outer periphery of the inner peripheral lip portion guiding jig 70. Since the surface and the outer peripheral surface of the end sleeve 12 are elastically pressed, the both 12 and 70 are held concentrically via the centering jig 80.

  Therefore, in this state, as shown in FIG. 22, the inner peripheral lip guide jig 72 is concentric with the end sleeve 12 by tightening the mounting bolt 75 screwed into the screw hole 12c of the end sleeve 12. It is possible to attach the inner peripheral lip guide jig 72 to the end sleeve 12 appropriately and easily. In addition, after the inner peripheral lip portion guiding jig 72 is attached to the end sleeve 12, the centering jig 80 is extracted upward from the end sleeve 12 and the inner peripheral lip portion guiding jig 70.

(Final process)
Finally, the connection fixing jig 40 is removed from the base end case portion 5 and the shaft body 11 to complete the maintenance work.

  Note that the method of assembling the elastic seal device according to the present invention is not limited to the above-described embodiment, and can be appropriately changed and improved without departing from the basic principle of the present invention. For example, the method of the present invention is not limited to a multi-channel rotary joint in which the mechanical seal device 5 and the elastic seal device 6 are used in combination, and a multi-channel rotary device that uses only the elastic seal device 6 as a channel sealing means. The present invention can also be suitably applied to a joint or a single flow path type rotary joint. In this case, in a multi-channel type rotary joint that uses only the elastic sealing device 6 as the channel sealing means, a pair of seal rings 23 and 24 are loaded between the seal flange 6a and the rotary shaft body 2. The number of the elastic sealing devices 6 is N (the number corresponding to the number of the second flow paths 4), but the method of the present invention is applied to the assembly or reassembly of each elastic sealing device 6. . Further, the method of the present invention is applied to the assembly or reassembly of the elastic seal device 6 in the above-described rotary joint, as well as the opposing circumference of the rotary shaft projecting from the housing of the rotating device and the seal flange attached to the housing. The present invention can also be suitably applied to the case of assembling or reassembling an elastic seal device used as a shaft seal device in which a seal ring made of an elastic material is loaded between the surfaces. In the case of a slack, it can also be suitably applied when assembling. Further, the assembly jig (the outer peripheral lip guide jigs 60 and 61, the inner peripheral lip guide jig 70, or the centering jig 80) according to the present invention is not limited to the above-described embodiment, and the present invention. Changes and improvements can be made as appropriate without departing from the basic principle of the above.

2 Rotating shaft body 4 Second flow path 4a Passage connection space 4b Shaft side path 4c Case side path 6 Elastic seal device 6b Seal flange (tip seal flange)
6e Seal surface 6f Seal surface 11 Shaft body 12 End sleeve 12a Seal portion 23 First seal ring 24 Second seal ring 25 Second fluid 27 Body portion of seal ring 28 Inner peripheral lip portion of seal ring 29 Outer peripheral lip of seal ring Part 30 Annular groove 31 Reinforcing spring 60 First outer peripheral lip part guide jig 60a Outer peripheral lip part guide surface 60b Outer peripheral lip part diameter reducing deformation surface 61 Second outer peripheral lip part guide jig 61a Outer peripheral lip part guide surface 61b Outer peripheral lip part Diameter reducing deformation surface 62 Pushing jig 70 Inner circumferential lip portion guiding jig 71 Inner circumferential lip portion guiding portion 71a Inner circumferential lip portion guiding surface 72 Inner circumferential lip diameter expanding deformation working portion 72a Inner circumferential lip portion diameter expanding deformation action Surface 80 Centering jig 84 First jig side O-ring 85 Second jig side O-ring 86 Shaft side O-ring

Claims (5)

An annular main body and a cylinder protruding in an axial direction from the main body portion in an axial direction between the rotating shaft body and a cylindrical seal flange concentrically inserted therethrough and elastically pressing and contacting the opposed peripheral surface A method of assembling an elastic seal device loaded with a seal ring made of an elastic material having an inner and outer peripheral lip portion, and inserting the seal ring into the seal flange while moving the seal ring in the axial direction thereof, A seal ring fitting process in which the seal ring is fitted into the seal flange in a state in which the outer peripheral lip portion is in press contact with the annular seal surface formed on the inner circumferential surface of the seal flange; By inserting and inserting the seal flange with the seal ring fitted in the direction, the seal ring is brought into a state where the inner peripheral lip portion is in press contact with the outer peripheral surface of the rotating shaft body. In assembling method of the elastic sealing apparatus comprising the steps fitting out the seal ring externally fitted to the shaft body,
In the seal ring internal fitting step, a cylindrical outer peripheral lip portion guide surface that is continuous with the seal surface on the inner peripheral surface and an outer peripheral lip portion diameter-reducing deformation working surface that gradually expands from the base end of the seal flange, the by attachment cylindrical outer peripheral lip portion derived jig comprising forming, a sealing ring, which is in a state positioned on the outer peripheral lip portion shrink-deformed working plane, then abuts against the main body portion of the seal ring cylinder The outer peripheral lip portion is reduced in diameter by the outer peripheral lip portion diameter-reducing action surface and is guided from the outer peripheral lip portion guide surface to the seal surface by being pushed into the seal surface by a cylindrical or rod-shaped pushing jig. After that, remove the outer peripheral lip guide jig from the seal flange,
In the seal ring external fitting process, an inner peripheral lip portion guiding portion having the same outer diameter as that of the rotating shaft body and a frustoconical or conical inner peripheral lip portion expanding gradually from the base end thereof. A rotating body-shaped outer peripheral lip guide jig having a diameter deforming action portion is attached in a concentric state where the axes coincide with each other, and a seal flange is attached to the seal ring fitted and held therein, and the inner peripheral lip diameter expanding deforming action portion The inner peripheral lip portion is expanded and deformed by the inner peripheral lip portion expanding deformation acting portion by moving in the axial direction in a state in which the inner peripheral lip portion is inserted from the inner peripheral lip portion guiding portion to a predetermined position of the rotary shaft body. A method for assembling an elastic seal device, wherein the outer lip guide jig is removed from the rotating shaft after guiding.   In the seal ring external fitting step, the jig-side O-ring made of an incompressible elastic material in which the cylindrical centering jig is engaged and held on the inner peripheral portion on the tip side is used as the inner peripheral lip guide jig. In the state where the shaft side O-ring made of an incompressible elastic material fitted and held on the base end side inner peripheral portion of the centering jig is fitted to the rotary shaft body, the inner peripheral lip portion is guided. After the inner peripheral lip guide part of the jig is moved in the axial direction to a position where it abuts the tip of the rotary shaft body, the inner peripheral lip part guide jig is attached to the rotary shaft body, and then the centering jig 2. The inner peripheral lip part guide jig is attached to the rotary shaft body in a state where the axes coincide with each other by detaching from the inner peripheral lip part guide jig and the rotary shaft body. A method for assembling the elastic sealing device to be described.   2. The outer peripheral lip portion guide jig according to claim 1, wherein the outer peripheral lip portion is reduced in diameter by gradually expanding from a cylindrical outer peripheral lip portion guide surface having the same diameter as the seal surface on the inner peripheral surface and a base end thereof. An assembly jig characterized in that the outer peripheral lip portion guiding surface can be attached to the seal flange in a state of being flush with the seal surface. .   The inner circumferential lip portion guiding jig according to claim 1, wherein the inner circumferential lip portion guiding portion has the same outer diameter as the distal end of the rotating shaft body, and a truncated cone shape or a conical shape gradually decreasing in diameter from the base end thereof. And an inner peripheral lip portion expanding and deforming action portion, and configured to be attached to the tip of the rotating shaft body in a concentric state in which the axis line coincides with the tip end of the rotating shaft body.   The centering jig according to claim 2, wherein a jig side O-ring made of an incompressible elastic material that can be fitted to an inner circumferential lip portion guiding jig is engaged and held at an inner peripheral portion on the front end side. An assembly jig characterized by a cylindrical body in which a shaft-side O-ring made of an incompressible elastic material that can be fitted to a rotating shaft body is engaged and held on a base end side inner peripheral portion.