JP7325218B2 - SEAL MEMBER AND METHOD FOR MANUFACTURING SEAL MEMBER - Google Patents

Description

The present invention relates to a sealing member and a method for manufacturing the sealing member.

Patent Literature 1 discloses an articulated seal member used in a split type mechanical seal. The sealing member includes a filamentary member having a predetermined overall length, a connecting portion protruding from one end of the filamentous member, and a connecting hole provided at the other end of the filamentary member. By inserting, the filament member is retained in an annular shape.

U.S. Pat. No. 6,485,024

In the seal member of Patent Document 1, one end and the other end of the linear member are pressed together by inserting the connecting portion into the connecting hole. Conversely, if it is too small, the sealing performance cannot be ensured.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seal member capable of maintaining the connected state of the filament members and ensuring sealing performance.

A seal member of the present invention comprises a filamentary member having a first end face and a second end face opposite to the first end face, and provided so as to be recessed from the first end face along the axis of the filamentary member. a connecting hole, a first coil spring arranged in the connecting hole, protruding from the second end face along the axis of the filament member, and fitted and connected to the first coil spring in the connecting hole, A second coil spring is provided that presses the first end surface and the second end surface by biasing.

When using this sealing member, for example, the wire rod of the protruding second coil spring is rotated in a direction opposite to the winding direction to arrange the second coil spring inside or outside the first coil spring, and then the second coil spring Rotate the wire in the winding direction by the number of twists. Thereby, the second coil spring is fitted and connected to the first coil spring. At this time, these fitting margins are made larger than the value obtained by subtracting the dimension from the first end face to the outer end of the first coil spring from the dimension from the second end face to the tip of the second coil spring.

Since the wire rod of the first coil spring and the wire rod of the second coil spring are screwed together, the connection state between the one end and the other end of the wire member can be reliably maintained. The first end face and the second end face can be press-contacted by the urging forces of the first coil spring and the second coil spring, and the press-contact force between the first end face and the second end face can be adjusted by adjusting the fitting margin of the two coil springs. The sealing performance of the sealing member can be ensured. In addition, since the connection portion between the first coil spring and the second coil spring is deformable along the shape of the mounting portion of the part to be sealed, it is possible to obtain sealing performance equivalent to that of an endless sealing member.

In a first aspect of the present invention, in addition to the basic configuration, the second coil spring protrudes from the second end face along the axis of the filament member and has a shape when viewed from the direction along the axis of the filament member. and a recess forming part of the connecting hole and into which the protrusion is fitted . According to this aspect, it is possible to reliably align the axes of the first end surface and the second end surface of the linear member by fitting the concave portion and the convex portion.

A third coil spring having at least a portion thereof embedded in the second end face side is provided, and the second coil spring is arranged so as to be fitted to the third coil spring. Alternatively, a third coil spring is arranged in the connecting hole, and the first coil spring is arranged so as to fit in the third coil spring. In these cases, the diameter of the third coil spring arranged on one of the second end face side and the first end face side is equal to that of the first coil spring arranged on the other of the second end face side and the first end face side. or the diameter of the second coil spring is preferably the same. According to this aspect, the fitting of the second coil spring to the first coil spring is stopped by the contact of the third coil spring with the first coil spring or the second coil spring. Therefore, it is easy to adjust the pressure contact force between the first end face and the second end face.

The outer diameter of the second coil spring is larger than the inner diameter of the first coil spring and smaller than the outer diameter of the first coil spring. Alternatively, the outer diameter of the first coil spring is larger than the inner diameter of the second coil spring and smaller than the outer diameter of the second coil spring. According to these aspects, the first coil spring and the second coil spring reliably maintain the connected state between the one end and the other end of the wire member, and press the first end face and the second end face against each other with a predetermined pressure contact force. can.

At least one of the first end surface and the second end surface is provided with an annular pressure contact portion that is pressed against the other of the first end surface and the second end surface. According to this aspect, the pressure contact portion provided on one of the first end face and the second end face is brought into pressure contact with the other, thereby improving the sealing performance therebetween.

In a second aspect of the present invention, in addition to the basic configuration, the filament member includes a filament main body, a first joint member joined to one end of the main body, and a second joint member joined to the other end of the main body. and two joint members, wherein the connecting hole and the first coil spring are provided in the first joint member, and the second coil spring is provided in the second joint member . According to this aspect, a commercially available endless seal ring having a predetermined diameter cut is used as the main body, and the first joint member and the second joint member are joined to both ends of the main body, thereby obtaining a desired total length (diameter). of sealing members can be prepared. Therefore, the manufacturing cost of the seal member can be reduced compared to the case where a mold is prepared for each seal member having a different overall length.

A third aspect of the present invention is a filament main body, a first joining member having a first coil spring disposed in a connecting hole recessed from a first end face, a first joining member protruding from a second end face, and positioned in the connecting hole in the first joint member. A second joint member is provided, which is capable of being connected to a coil spring and is provided with a second coil spring for press-contacting the first end surface and the second end surface by biasing, and is attached to one end of the main body . , joining the end of the first joining member located opposite to the first end surface, joining the end of the second joining member located opposite to the second end surface to the other end of the main body; A method for manufacturing a seal member is provided.

In the present invention, since the first coil spring and the second coil spring are fitted (screwed together), the connection state between the one end and the other end of the seal member can be reliably maintained. Further, since the pressure contact force between the first end face and the second end face can be adjusted by adjusting the fitting margin of the coil springs, the sealing performance of the sealing member can be ensured.

1 is a cross-sectional view of a split mechanical seal using a seal member according to an embodiment of the present invention; FIG. The front view of a sealing member. The front view which shows the sealing member before joining. FIG. 3 is a partially enlarged perspective view of FIG. 2; FIG. 3 is a partially enlarged sectional view of FIG. 2; Sectional drawing which shows the connection state of a sealing member. Schematic which shows the relationship of a 1st coil spring and a 2nd coil spring. Sectional drawing which shows the joint part of a sealing member. Sectional drawing which shows the 1st modification of a sealing member. Sectional drawing which shows the 2nd modification of a sealing member. Sectional drawing which shows the 3rd modification of a sealing member. Sectional drawing which shows the 4th modification of a sealing member. Sectional drawing which shows the 5th modification of a sealing member. Sectional drawing which shows the 6th modification of a sealing member. FIG. 11 is a partially enlarged view showing a connected state of sealing members of a sixth modification; Sectional drawing which shows the other modification of a sealing member. Sectional drawing which shows the other modification of a sealing member. Sectional drawing which shows the other modification of a sealing member. Sectional drawing which shows the other modification of a sealing member. Sectional drawing which shows the other modification of a sealing member.

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

FIG. 1 shows a mechanical seal 10 using a seal member 40 (40A-40C) according to an embodiment of the invention. Referring to FIG. 2, the seal member 40 is formed by connecting a spring (first coil spring) 46 arranged at one end of the wire member 41 to a spring (second coil spring) 47 arranged at the other end, thereby forming an annular shape. is held to

First, the outline of the mechanical seal 10, which is an example of equipment using the seal member 40, will be described.

As shown in FIG. 1, the mechanical seal 10 is arranged in a portion of a casing 1 of a rotating machine (for example, a vertical shaft pump) through which a rotating shaft 2 passes. The mechanical seal 10 is an inside type that prevents the liquid from flowing out from the sealing liquid chamber 23 communicating with the inside of the casing 1 toward the rotating shaft 2 side (diameter direction inner side) communicating with the atmosphere.

The mechanical seal 10 includes a holder 12, a seat (rotary ring) 15, and a washer (stationary ring) 18, which are arranged inside a seal cover 21 (sealing liquid chamber 23). A clasp 26 and a pusher 29 are further arranged inside the seal cover 21 , and the outer end of the seal cover 21 is covered with a plate 31 .

A holder 12 is arranged so as to be positioned near the casing 1 with respect to the rotating shaft 2, and is immovably attached by a set bolt (not shown). A seal member 40A is disposed in a groove formed in the inner peripheral surface of the holder 12, and seals between the rotary shaft 2 and the holder 12 by the seal member 40A.

The seat 15 is attached to an attachment recess 12 a formed on the outer side of the holder 12 . Circumferential rotation of the seat 15 with respect to the holder 12 is restricted by a pin 16 arranged in the mounting recess 12a. As a result, the seat 15 rotates integrally with the rotating shaft 2 via the holder 12 and comes into sliding contact with the washer 18 . A seal member 40B is provided around the outer periphery of the seat 15, and the space between the holder 12 and the seat 15 is sealed by the seal member 40B.

The washer 18 is arranged inside the seal cover 21 so as to be positioned on the outer side of the seat 15 . Circumferential rotation of the washer 18 with respect to the seal cover 21 is restricted by the clasp 26 , presser metal 29 and drive pin 19 penetrating the plate 31 , and axial movement of the washer 18 with respect to the seal cover 21 is permitted.

The washer 18 protrudes inward and includes a convex portion 18 a having a rectangular cross-section and slidingly contacting the seat 15 . A seal member 40C is provided around the washer 18, and the space between the washer 18 and the seal cover 21 is sealed by the seal member 40C.

The seal cover 21 includes a penetration portion 22 through which the rotating shaft 2 penetrates, and a sealing liquid chamber 23 communicating with the inside of the casing 1 . The seal cover 21 is fixed to the casing 1 by tightening bolts 24 passed along the rotating shaft 2 into the bolt holes 1a.

The clasp 26 is arranged on the inner side of the plate 31 . The clasp 26 is connected to the seal cover 21 by bolts 27 and to the plate 31 by bolts (not shown).

A presser foot 29 is arranged between the clasp 26 and the washer 18 . One end of the coil spring 33 passing through the clasp 26 is arranged on the pusher 29 , and the other end of the coil spring 33 is arranged on the plate 31 . The force of the coil spring 33 causes the pusher 29 to press (bias) the washer 18 toward the seat 15 .

The mechanical seal 10 of this embodiment is a fully split type in which the holder 12, seat 15, washer 18, seal cover 21, clasp 26, pusher 29, and plate 31 are each split into two in the circumferential direction. The holder 12 includes a first holding member 12A and a second holding member 12B obtained by dividing an annular body. The seat 15 includes a first rotating member 15A and a second rotating member 15B obtained by dividing an annular body. The washer 18 includes a first fixing member 18A and a second fixing member 18B obtained by dividing an annular body. The seal cover 21 includes a first cover member 21A and a second cover member 21B obtained by dividing an annular body. The clasp 26 includes a first connecting member 26A and a second connecting member 26B obtained by dividing an annular body. The pressing metal 29 includes a first pressing member 29A and a second pressing member 29B obtained by dividing an annular body. The plate 31 includes a first plate member 31A and a second plate member 31B obtained by dividing an annular body.

In this fully split type mechanical seal 10, by removing the cover members 21A and 21B (seal cover 21) from the casing 1 radially outward, rotating members 15A and 15B (seats 15) and fixed members 18A and 18B (washers) are separated. 18) can be removed and installed. Therefore, the seat 15, the washer 18, the coil spring 33, etc., which are expendable parts, can be replaced without removing the motor at the tip of the rotary shaft 2. FIG.

If the seal members 40B and 40C are endless seal rings, the seal members 40B and 40C cannot be replaced even if the seat 15 and washer 18 can be replaced without removing the motor. As the seal members 40B and 40C, as shown in FIG. 2, if a connected seal ring having a connecting structure at one end and the other end is used, the seal members 40B and 40C can be replaced. The seal member 40A arranged between the rotating shaft 2 and the holder 12 may be an endless seal ring, but is preferably a connected seal ring.
(Outline of seal member)

As shown in FIGS. 2 to 6, the seal member 40 includes an elastically deformable rubber filament member 41 and a spring (first coil spring) embedded in the first end surface 41a of the filament member 41. ) 46, and a spring (second coil spring) 47 projecting from the second end surface 41b (positioned opposite to the first end surface 41a) of the wire member 41. As shown in FIG. By fitting (screwing) the spring 47 on the one side to the spring 46 on the other side, the filamentous member 41 is held in an annular shape.

As shown most clearly in FIG. 3, filar member 41 comprises an elongate filament body 42, a first connecting member 43 disposed at one end of body 42, and a second joint member 43 disposed at the other end of body 42. and a joining member 44 . 5 and 6, the main body 42 and the first joint member 43 are joined through a joint portion 45A, and the main body 42 and the second joint member 44 are joined through a joint portion 45B.

The main body 42 has a circular cross section with a defined diameter, one end forming a joint surface 42a for joining the first joint member 43, and the other end forming a joint surface 42b for joining the second joint member 44. As shown in FIG. The first joint member 43 has a columnar shape with the same diameter as that of the main body 42 , and the connecting surface 43 a at one end constitutes the first end surface 41 a , and the other end constitutes the joint surface 43 b to be joined to the main body 42 . The second joint member 44 has a columnar shape with the same diameter as the main body 42 , and has a connecting surface 44 a at one end forming a second end surface 41 b and a joint surface 44 b joined to the main body 42 at the other end. The main body 42, the first joint member 43, and the second joint member 44 are joined so that their axes are aligned with each other.

The connecting surfaces 43a, 44a (end surfaces 41a, 41b) and the joint surfaces 42a, 42b, 43b, 44b are planar and extend in a direction orthogonal to the axis A of the filament member 41, respectively. The joint surface 42a of the main body 42 and the joint surface 43b of the first joint member 43, and the joint surface 42b of the main body 42 and the joint surface 44b of the second joint member 44 are joined by vulcanization (joint portions 45A and 45B). . In FIGS. 4 and 5, the joints 45A and 45B are shown with a predetermined width. A clear line (step) may appear due to the glue 45b flowing on the outer peripheral surface.

Referring to FIG. 2, the total length L of the wire member 41 is defined as the distance from the first end surface 41a to the second end surface 41b. The total length L varies depending on the diameter of the portion to be sealed, and in the case of the mechanical seal 10, varies depending on the seal members 40A-40C. Referring to FIG. 3, the total length L1 of the main body 42 from one joint surface 42a to the other joint surface 42b varies depending on the total length L of the wire member 41. As shown in FIG. The total length L2 of the first joint member 43 from the connecting surface 43a to the joint surface 43b and the total length L3 of the second joint member 44 from the connecting surface 44a to the joint surface 44b are the same regardless of the total length L of the linear member 41. be. That is, when manufacturing seal members 40 having different overall lengths L, parts having different overall lengths are used for the main body 42, and parts having the same configuration are used for the first joint member 43 and the second joint member 44, respectively.

As shown in FIGS. 4 to 6, the first joint member 43 (that is, the side of the first end surface 41a of the wire member 41) is provided with a connecting hole 43c recessed along the axis A of the wire member 41. A spring 46 is arranged in the connecting hole 43c. A spring 47 is provided so as to protrude along the axis A of the wire member 41 on the second joint member 44 (that is, on the side of the second end surface 41b of the wire member 41).

As shown most clearly in FIG. 5, the connecting hole 43c includes a recess 43d adjacent to the connecting surface 43a (first end surface 41a) and a mounting portion 43e communicating with the recess 43d. 43 d of recessed parts are column-shaped spaces opened by the connection surface 43a. The mounting portion 43e is a columnar space provided so as to communicate spatially with the recess 43d. The inner diameter of the recess 43d is larger than the inner diameter of the mounting portion 43e. When viewed from the direction along the axis A of the wire member 41, the connecting surface 43a, the recess 43d, and the mounting portion 43e are concentric.

The spring 46 is a coil spring in which a wire is spirally wound. In the spring 46, adjacent wire rods along the axis A of the wire member 41 are in close contact. A half of the spring 46 on the side of the outer end 46a is arranged inside the mounting portion 43e and is in contact with the inner peripheral surface of the mounting portion 43e. A half of the spring 46 on the inner end 46b side is embedded in a solid portion between the bottom of the mounting portion 43e and the joint surface 43b. In this embodiment, the outer end 46a of the spring 46 is positioned at the outer end of the mounting portion 43e (that is, the boundary portion between the mounting portion 43e and the recess 43d). The outer end 46a side of the spring 46 may or may not be fixed to the inner peripheral surface of the mounting portion 43e with rubber glue or the like.

The second joint member 44 is provided with a convex portion 44c that fits into the concave portion 43d. The convex portion 44c protrudes in a cylindrical shape from the connecting surface 44a (second end surface 41b). When viewed from the direction along the axis A of the wire member 41, the connecting surface 44a and the convex portion 44c are concentric. The diameter of the convex portion 44c is set within a range determined based on the diameter of the concave portion 43d. More specifically, the diameter of the convex portion 44c is set within a range of 60% or more and 120% or less of the diameter of the concave portion 43d. If the diameter of the convex portion 44c is excessively increased, the frictional resistance between the convex portion 44c and the concave portion 43d increases. If the diameter of the projection 44c is excessively small, the degree of contribution to aligning the axes of the first end surface 41a and the second end surface 41b becomes low. In order to prevent these inconveniences, it is preferable to set the diameter of the projection 44c within the range defined above.

The spring 47 is a coil spring in which a wire is wound in the same direction as the wire of the spring 46 (counterclockwise in FIG. 3) so as to form a spiral. In the spring 47, the wire rods adjacent along the axis A of the wire member 41 are in close contact. A half of the spring 47 on the side of the outer end 47a protrudes (exposes) from the convex portion 44c (second end face 41b). A half of the spring 47 on the inner end 47b side is embedded in a solid portion between the tip of the projection 44c and the joint surface 44b. When viewed from the direction along the axis A of the filament member 41, the outer diameter of the spring 47 is smaller than the diameter (outer diameter) of the projection 44c.

Referring to FIG. 7, the outer diameter Ro of the spring 47 on the second joint member 44 side is larger than the inner diameter ri of the spring 46 on the first joint member 43 side and smaller than the outer diameter ro of the spring 46 . More specifically, the outer diameter Ro of the spring 47 is a numerical value (0. 01d or more and 1d or less) is added (ri+0.01d≦Ro≦ri+1d). If the outer diameter Ro of the spring 47 is excessively small, the wire rod of the spring 47 cannot be locked between the adjacent wire rods of the spring 46, and the spring 47 may be separated from the spring 46. If the outer diameter Ro of the spring 47 is excessively increased, the spring 47 cannot be fitted and connected to the spring 46 . In order to prevent these inconveniences, it is preferable to set the outer diameter Ro of the spring 47 within the range defined above.

Referring to FIG. 5, in the direction along the axis A of the wire member 41, the width W1 of the recess 43d from the connecting surface 43a to the bottom (mounting portion 43e) of the recess 43d is is larger than the width W2 of the convex portion 44c up to. In the direction along the axis A of the filament member 41, the dimension S1 from the connecting surface 43a to the bottom of the connecting hole 43c (mounting portion 43e) is greater than the dimension S2 from the connecting surface 44a to the outer end 47a of the spring 47. is also big. As a result, when one end and the other end of the filament member 41 are connected, the first end surface 41a and the second end surface 41b can be pressed against each other, ensuring the sealing performance therebetween.

When connecting one end and the other end of the wire member 41, the fitting margin S (see FIG. 6) of the springs 46 and 47 is calculated from the dimension S2 from the second end face 41b to the outer end 47a of the spring 47 to the first end face It is made larger than the value obtained by subtracting the dimension S3 from 41a to the outer end 46a of the spring 46 (S>S2-S3). As a result, the first end surface 41a and the second end surface 41b are reliably brought into contact with each other, and the springs 46 and 47 of both of them are applied with a biasing force (a force in the direction in which the first end surface 41a and the second end surface 41b approach each other). It secures the sealing property between 41a and 41b.

For example, the diameter of the wire member 41 is set to 2 mm or more and 40 mm or less, preferably 3 mm or more and 12 mm or less. On the other hand, the diameter of the concave portion 43d is set to 1 mm or more and 35 mm or less, preferably 2 mm or more to 9 mm or less, and the diameter of the convex portion 44c is set within the above range with respect to the diameter of the concave portion 43d.

In addition, the difference between the width W1 of the concave portion 43d and the width W2 of the convex portion 44c (that is, the overlapping margin) is set in the range of 0.05 mm or more and 20 mm or less, preferably 0.1 mm or more and 10 mm or less (0.05 mm≦W1 -W2≤20 mm). If the overlapping margin is excessively small, the degree of contribution to aligning the axes of the first end surface 41a and the second end surface 41b becomes low. If the overlapping margin is excessively increased, the frictional resistance between the concave portion 43d and the convex portion 44c increases, so the pressing force (sealing property) of the end surfaces 41a and 41b due to the urging force of the springs 46 and 47 is reduced. In order to prevent these inconveniences, it is preferable to set the overlap margin within the range defined above.

When using this seal member 40, for example, the protruding wire of the spring 47 is rotated in a direction opposite to the winding direction (counterclockwise in FIG. 3) to place the spring 47 inside the spring 46. Rotate in the winding direction by the number of twists. As a result, the spring 47 is fitted to the spring 46 in the mounting portion 43e (connection hole 43c), and they are connected. At this time, the number of twists of the spring 47 is adjusted so that the fitting margin S shown in FIG. 6 falls within the aforementioned set range (S>S2-S3). The winding direction and rotating direction of the spring 47 can be changed as required.

As shown in FIG. 6, in the connected state, the spring 46 on the side of the first joint member 43 and the spring 47 on the side of the second joint member 44 overlap in the radial direction of the wire member 41, and the wires of both are locked. do. In addition, in the direction in which the axis A of the wire member 41 extends, gaps are generated between the adjacent wire rods of the spring 46 and between the adjacent wire rods of the spring 47, and a biasing force is generated in the springs 46 and 47 in a mutually pulling direction. . As a result, the joint members 43 and 44 in which the inner ends 46b and 47b of the springs 46 and 47 are embedded are urged toward each other, and the first end surface 41a and the second end surface 41b are pressed against each other.

Next, features of the sealing member 40 of this embodiment will be described.

Since the wire rod of the spring 46 on the first joint member 43 side and the wire rod of the spring 47 on the second joint member 44 side are screwed together, the connection state between one end and the other end of the wire member 41 can be reliably maintained. The first end surface 41a and the second end surface 41b can be pressed against each other by the urging forces of the springs 46 and 47 of both of them, and the pressure contact force between the first end surface 41a and the second end surface 41b can be adjusted by adjusting the fitting margin S of these, thereby providing a seal. Sealability of the member 40 can be ensured.

Both springs 46 and 47 are elastically deformable, and the connecting portion between them is also elastically deformable. Therefore, since the connecting portion of the springs 46 and 47 is deformed along the shape of the mounting portion of the part to be sealed, sealing performance equivalent to that of the endless sealing member can be obtained.

By fitting the concave portion 43d provided on the first end surface 41a and the convex portion 44c provided on the second end surface 41b, these axes can be reliably aligned. Since the outer diameter Ro of the spring 47 is larger than the inner diameter ri of the spring 46 and smaller than the outer diameter ro of the spring 46, the engagement of these wire rods reliably maintains the connected state, and the first end surface 41a and the first end face 41a. The second end face 41b can be pressed with a predetermined pressing force.

The seal member 40 can also be used as a jig (restraint) for assembling the mechanical seal 10 shown in FIG. For example, when assembling the seat 15 and the washer 18, it is necessary to annularly hold the half-split rotating members 15A and 15B and the fixed members 18A and 18B on the outer periphery of the rotating shaft 2. FIG. At this time, by arranging a sealing member 40 having a predetermined diameter around the outer circumferences of the rotating members 15A and 15B and the fixed members 18A and 18B, they can be held in an annular shape. Therefore, the ease of assembly of the mechanical seal 10 can be improved.

The wire member 41 has a main body 42, a first joint member 43, and a second joint member 44. A connecting hole 43c and a spring 46 are provided in the first joint member 43, and a spring 47 is provided in the second joint member 44. is provided. Therefore, by using a commercially available endless seal ring as the main body 42 and joining the first joint member 43 and the second joint member 44 to the main body 42, the seal member 40 having a desired total length (diameter) can be prepared. Therefore, the manufacturing cost of the seal member 40 can be reduced compared to the case where a mold is prepared for each seal member having a different overall length.

Specifically, when manufacturing the seal members 40A to 40C having different total lengths L, first, a molding die (not shown) is used to perform injection molding, direct pressure molding, or direct pressure injection molding. The member 43 and the second joint member 44 having the spring 47 are mass-produced. In addition, commercially available endless seal rings with different diameters (lengths) are prepared.

Then, as shown in FIG. 3, first, the endless seal ring is cut, adjusted to the length L1 required for the seal member 40, and used as the main body . At this time, the length L1 of the main body 42 is set in consideration of the length of the vulcanized joints 45A and 45B. Moreover, when raw rubber is used for joining the joint surfaces 44b and 42b and joining the joint surfaces 42a and 43b, heat shrinkage during vulcanization is taken into consideration.

Subsequently, the first joint member 43 is arranged on one joint surface 42 a of the main body 42 , and the second joint member 44 is arranged on the other joint surface 42 b of the main body 42 . Subsequently, as shown in FIG. 8, an unvulcanized rubber 45a is placed between the joint surfaces 42a and 43b and between the joint surfaces 42b and 44b, and the first joint member 43, the unvulcanized rubber 45a, The main body 42, the unvulcanized rubber 45a, and the second joint member 44 are bonded together.

Finally, both ends of the main body 42 including the first joint member 43 and the second joint member 44 are placed in a vulcanization mold (not shown) and vulcanized. As a result, the sealing member 40 having a predetermined total length L is completed by joining the first joining member 43 and the second joining member 44 to both ends of the main body 42 .

As described above, in the seal member 40 of the present embodiment, a commercially available endless seal ring having a predetermined diameter can be used as the main body 42. Therefore, each seal member 40 (40A to 40C) having a different total length L (curvature) is made of metal. Manufacturing costs can be reduced compared to the case of preparing a mold.
(Modified example of sealing member)

The sealing member 40 may be configured as shown in FIGS. 9 to 14 .

In the first modification shown in FIG. 9, the concave portion 43d has a truncated cone shape whose diameter gradually decreases toward the mounting portion 43e, and the convex portion 44c has a truncated cone shape whose diameter gradually decreases toward the tip. In this way, even if the concave portion 43d and the convex portion 44c have inclined portions (tapered portions) on their outer peripheries, it is possible to obtain the same effects and effects as in the above-described embodiment.

In the second modification shown in FIG. 10, a spring 47 is arranged on the second joint member 44 via a spring (third coil spring) 48 . The spring 48 is a coil spring in which a wire is wound in the same direction as the wire of the springs 46 and 47 so as to form a spiral. The diameter (outer diameter and inner diameter) of the spring 48 is the same as the diameter of the spring 46 of the first joint member 43 and larger than the diameter of the spring 47 . In the spring 48, adjacent wire rods along the axis A of the wire member 41 are in close contact. The outer end 48a side of the spring 48 protrudes (exposes) from the projection 44c, and the inner end 48b side of the spring 48 is embedded in the solid portion. The spring 47 is fitted inside the spring 48 and fixed (connected) to the spring 48 so as not to rotate relative to it.

The seal member 40 of this second modification is manufactured and used in the same manner as in the above embodiment. The spring 47 on the side of the second joint member 44 is fitted into the spring 46 on the side of the first joint member 43, and when the predetermined fitting allowance is exceeded, the outer end 48a side of the spring 48 moves toward the outer end 46a side of the spring 46. Abutment stops mating. Therefore, excessive fitting, that is, excessive pressure contact between the first end surface 41a and the second end surface 41b can be prevented, so the configuration of the second modification is effective when it is desired to keep the pressure contact force constant. It should be noted that the entire outer periphery of the spring 48 may be embedded in the second joint member 44 and the spring 47 may be arranged inside.

In a third modification shown in FIG. 11, a spring 48 similar to that of the second modification is arranged on the second joint member 44, and a spring 47 is fitted and fixed to the outside of this spring 48. As shown in FIG. The connecting hole 43c of the first joint member 43 is a cylindrical space in which the concave portion and the mounting portion are integrated, and a gap is secured between the inner peripheral surface of the connecting hole 43c and the spring 46 so that the spring 47 can be arranged. It is That is, the outer diameter of the spring 46 of the first joint member 43 is larger than the inner diameter of the spring 47 of the second joint member 44 and smaller than the outer diameter of the spring 47 . In this third modification, it is possible to obtain the same actions and effects as in the second modification.

In a fourth modification shown in FIG. 12, the spring 48 shown in the second modification is provided integrally with the spring 47 . That is, the spring 47 has a small diameter portion 47c on the side of the outer end 47a that can be fitted into the spring 46, and a large diameter portion 47d on the side of the inner end 47b that cannot fit into the spring 46 (same diameter). In this fourth modified example, it is possible to obtain the same actions and effects as in the second modified example.

In a fifth modification shown in FIG. 13, the spring 48 is embedded in the first joint member 43, and the spring 46 is fitted to the spring 48 to be arranged. The diameter (outer diameter and inner diameter) of the spring 48 is larger than the diameter of the spring 46 and the same as the diameter of the spring 47 on the second joint member 44 side. In the first joint member 43, the outer end 48a of the spring 48 is positioned inside the connecting hole 43c, and the inner end 48b side of the spring 48 is embedded in the solid portion. The spring 46 is fitted inside the spring 48 and fixed (connected) to the spring 48 so as not to rotate relative to it. In this fifth modification, the same actions and effects as in the second modification can be obtained.

In addition, in the fifth modification, the spring 46 may be arranged outside the spring 48 and the spring 47 of the second joint member 44 may be fitted inside the spring 46 to be connected. Also in the fifth modification, the spring 48 may be provided integrally with the spring 46 as in the fourth modification.

As in the sixth modification shown in FIG. 14, pressure contact portions 43f and 44d protruding along the axis of the linear member 41 are provided on the first end surface 41a (connecting surface 43a) and the second end surface 41b (connecting surface 44a). may be provided.

The pressure contact portions 43f and 44d are annular, and the outermost peripheral portions about the axis of the linear member 41 or the vicinity thereof protrude the most. The pressure contact portions 43f and 44d are flexible, and when the spring 46 of the first joint member 43 and the spring 47 of the second joint member 44 are connected, they are pressed against each other as shown in FIG. 41 radially outwardly. Thereby, the sealing performance of the end surfaces 41a and 41b of the seal member 40 can be improved.

The pressure contact portions 43f and 44d may be configured as shown in FIGS. 16 to 20. FIG. 16 to 20 show only the pressure contact portion 44d formed on the second end face 41b, the same applies to the pressure contact portion 43f formed on the first end face 41a.

Specifically, as shown in FIGS. 16 and 17, the tip (top) of the pressure contact portion 44d may be a flat portion 44e extending in a direction perpendicular to (intersecting) the axis of the linear member 41, As shown in FIGS. 18 to 20, the curved portion 44f may be chamfered into an arc shape with a predetermined curvature.

As shown in FIG. 16, the pressure contact portion 44d may be provided so as to protrude only from a portion (outermost peripheral portion) of the second end surface 41b. In this case, the second end face 41b has a flat portion orthogonal to the axis of the filament member 41 and an inclined portion intersecting the axis of the filament member 41. As shown in FIG. Moreover, as shown in FIGS. 17 and 18, the pressure contact portion 44d may be provided so that the entire first end surface 41a protrudes. In this case, the first end surface 41b is inclined in a direction intersecting with the axis of the filament member 41 .

The intersection of the second end surface 41b and the outer peripheral surface of the convex portion 44c may be a corner portion 44g which is orthogonal as shown in FIG. 16, or a curved portion curved with a predetermined curvature as shown in FIGS. It may be 44 hours. Moreover, it is good also as an inclined part which inclined at the determined angle.

16 to 18, the outer peripheral surface of the pressure contact portion 44d may be cylindrical so as to be flush with the outer peripheral surface of the other wire member 41, or as shown in FIG. It may be a conical cylinder that gradually widens at a predetermined angle α from the outer peripheral surface of the linear member 41, or as shown in FIG. It may be in the form of

Only one of the first end face 41a and the second end face 41b may be provided with the pressure contact portion. Further, when the pressure contact portions 43f and 44d are provided on both the first end surface 41a and the second end surface 41b, one of the modifications shown in FIGS. Either one may be formed on the second end face 41b.

The sealing member 40 of the present invention can be modified in various other ways.

For example, the main body 42, the first joint member 43, and the second joint member 44 may have a rectangular cross-section, and the cross-sectional shape can be changed as necessary. Each of the concave portion 43d and the convex portion 44c may have a square cross-sectional shape, and the cross-sectional shape thereof can be changed as necessary. Each of the wire rods of the springs 46 to 48 may have a square cross-section, and the cross-sectional shape can be changed as required.

A large number of sealing members 40 having one end having the first spring 46 and the other end having the second spring 47 may be prepared, and two or more sealing members 40 may be spliced to form one sealing member.

Various modifications are also possible for the manufacturing method of the sealing member of the present invention.

For example, the bonding between the main body 42 and the first bonding member 43 and the bonding between the main body 42 and the second bonding member 44 may be performed by vulcanization using only the unvulcanized rubber 45a, or by using only the rubber glue 45b. It may be done by gluing. Further, the wire member 41 is not limited to the method of dividing and molding the main body 42, the first joint member 43, and the second joint member 44, and these may be integrally molded with one molding die. .

The mechanical seal 10 using the seal member 40 of the present invention is limited to a fully split type in which the holder 12, seat 15, washer 18, seal cover 21, clasp 26, pusher 29, and plate 31 are all split into two in the circumferential direction. Instead, the seat 15, the washer 18, and the seal cover 21 may be divided into two. Further, the mechanical seal may be an outside type that prevents liquid from flowing out from the inside to the outside in the radial direction with respect to the rotating shaft.

The seal member 40 of the present invention can also be used for the mating surfaces of casings of equipment other than the mechanical seal 10, such as pump parts, and its usage can be changed as necessary.

Reference Signs List 1 casing 1a bolt hole 2 rotating shaft 10 mechanical seal 12 holder 12A, 12B holding member 12a mounting recess 15 seat 15A, 15B rotating member 16 pin 18 washer 18A, 18B fixing member 18a Convex portion 19 Drive pin 21 Seal cover 21A, 21B Cover member 22 Through portion 23 Sealing liquid chamber 24 Bolt 26 Clasp 26A, 26B Connecting member 27 Bolt 29 Pusher 29A, 29B Pressing member 31 Plate 31A, 31B Plate member 33 Coil spring 40, 40A to 40C Seal member 41 Wire member 41a First end surface 41b Second end surface 42 Main body 42a Joint surface 42b Joint surface 43 First joint member 43a Connection surface 43b Joint surface 43c Connection hole 43d Recessed portion 43e Mounting portion 43f Pressure contact portion 44 Second joint member 44a Connection surface 44b Joint surface 44c Convex portion 44d Pressure contact portion 44e... Flat part 44f... Curved part 44g... Corner part 44h... Curved part 45A, 45B... Joint part 45a... Unvulcanized rubber 45b... Rubber glue 46... Spring (first coil spring)
46a... Outer end 46b... Inner end 47... Spring (second coil spring)
47a... Outer end 47b... Inner end 47c... Small diameter portion 47d... Large diameter portion 48... Spring (third coil spring)
48a... Outer end 48b... Inner end A... Axis of wire member

Claims (9)

a wire member having a first end face and a second end face opposite to the first end face;
a connecting hole recessed from the first end face along the axis of the filament member;
a first coil spring disposed within the connecting hole;
A second coil spring protrudes from the second end surface along the axis of the filament member, is fitted and connected to the first coil spring in the connecting hole, and presses the first end surface and the second end surface by biasing. coil spring and
a protrusion projecting from the second end surface along the axis of the wire member and having a shape larger than the outer diameter of the second coil spring when viewed along the axis of the wire member;
A sealing member comprising: a concave portion forming a part of the connecting hole and into which the convex portion is fitted. A third coil spring at least partially embedded in the second end face side,
2. The seal member according to claim 1, wherein said second coil spring is arranged so as to be fitted in said third coil spring. a third coil spring disposed within the connecting hole;
2. The sealing member according to claim 1, wherein said first coil spring is arranged so as to fit said third coil spring. The sealing member according to any one of claims 1 to 3, wherein an outer diameter of said second coil spring is larger than an inner diameter of said first coil spring and smaller than an outer diameter of said first coil spring. The sealing member according to any one of claims 1 to 3, wherein an outer diameter of said first coil spring is larger than an inner diameter of said second coil spring and smaller than an outer diameter of said second coil spring. 6. The method according to any one of claims 1 to 5, wherein at least one of said first end surface and said second end surface is provided with an annular pressure contact portion that is pressed against the other of said first end surface and said second end surface. The sealing member according to any one of claims 1 to 3. The wire member has a wire body, a first joint member joined to one end of the body, and a second joint member joined to the other end of the body,
7. The seal according to any one of claims 1 to 6, wherein said connecting hole and said first coil spring are provided in said first joining member, and said second coil spring is provided in said second joining member. Element. a wire member having a first end face and a second end face opposite to the first end face;
a connecting hole recessed from the first end face along the axis of the filament member;
a first coil spring disposed within the connecting hole;
A second coil spring protrudes from the second end surface along the axis of the filament member, is fitted and connected to the first coil spring in the connecting hole, and presses the first end surface and the second end surface by biasing. with a coil spring and
The wire member has a wire body, a first joint member joined to one end of the body, and a second joint member joined to the other end of the body,
A sealing member, wherein the connecting hole and the first coil spring are provided in the first joining member, and the second coil spring is provided in the second joining member. a main body of the filament;
a first joining member having a first coil spring disposed in a connecting hole recessed from the first end surface;
A second coil spring protruding from the second end face, capable of being connected to the first coil spring by being fitted in the connecting hole, and for press-contacting the first end face and the second end face by biasing is arranged in the second coil spring . 2 Prepare a joint member and
joining an end of the first joining member located opposite to the first end surface to one end of the main body;
joining the end of the second joining member located opposite to the second end surface to the other end of the main body;
A method for manufacturing a sealing member.

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