JP7580892B2 - Shaft seal device - Google Patents

Description

The present invention relates to a shaft seal device that seals between the rotating shaft and the casing of a rotating machine.

As a shaft seal device that prevents leakage of the sealed fluid around the rotating shaft in a rotating machine, for example, a mechanical seal is known that includes one sliding part held in a casing, a cylindrical sleeve fixed to the rotating shaft inserted into the casing, and the other sliding part fixed to the sleeve, with the pair of sliding parts sliding relative to one another. In order to improve maintainability, such mechanical seals sometimes use a sleeve with a split structure that is composed of one sleeve member that comes into contact with the highly corrosive sealed fluid and the other sleeve member that comes into contact with a fluid different from the sealed fluid, such as the atmosphere.

For example, the shaft seal device shown in Patent Document 1 is composed of a first sleeve as an outer diameter side sleeve on the outside of the machine, and a second sleeve as an inner diameter side sleeve on the inside of the machine. The first sleeve and the second sleeve are connected in the axial direction by screwing a male threaded portion on the outer periphery of the end of the second sleeve into a female threaded portion on the inner periphery of the end of the first sleeve. In addition, the relative rotation between the first sleeve and the second sleeve is restricted by inserting a pin through the through hole of the first sleeve and the through hole of the second sleeve, which are aligned in the axial and circumferential directions, so that the screwing between the first sleeve and the second sleeve is prevented from loosening.

In this way, the first sleeve and the second sleeve are detachably attached, so when the second sleeve, which is placed on the highly corrosive sealed fluid side, needs to be replaced due to corrosion or the like, only the second sleeve needs to be replaced, and the first sleeve, which does not need to be replaced, can continue to be used as is. This provides excellent maintenance workability.

JP 2018-71566 A (page 6, Figure 3)

In the shaft seal device of Patent Document 1, the first sleeve and the second sleeve are screwed together and the pin prevents rotation, thereby reliably maintaining the first sleeve and the second sleeve connected together. However, when assembling the first sleeve and the second sleeve, it is necessary to align the relative positions of the through hole of the first sleeve and the through hole of the second sleeve for inserting the pin in the axial and circumferential directions while connecting the first sleeve and the second sleeve in the axial direction by screwing them together, making the assembly work of the first sleeve and the second sleeve cumbersome. In addition, when disassembling the first sleeve and the second sleeve, it is necessary to release the screw engagement between the first sleeve and the second sleeve and remove the pin, making the disassembly work also cumbersome.

The present invention was developed to address these problems, and aims to provide a shaft seal device that can be easily assembled and disassembled.

In order to solve the above problems, the shaft seal device of the present invention comprises:
one sliding part held in a casing through which a rotating shaft is inserted;
an inner diameter side sleeve and an outer diameter side sleeve that are inserted and fixed to the rotating shaft;
A shaft seal device comprising: a sliding component that is held by the inner diameter side sleeve or the outer diameter side sleeve and slides relative to the one sliding component,
The inner sleeve is partially inserted into the outer sleeve,
One of the sleeves has a through hole extending therethrough in the radial direction,
a recess is formed in the other sleeve to define a space between the other sleeve and the one sleeve;
The recess has an inclined surface,
A fixing member that abuts against the inclined surface and is fixed to the through hole is inserted into the through hole.
According to this, the tip of the fixed member is pressed against the inclined surface in the radial direction to restrict relative rotation between the inner diameter side sleeve and the outer diameter side sleeve, and the tip of the fixed member is engaged with the inclined surface in the axial direction to restrict disengagement between the inner diameter side sleeve and the outer diameter side sleeve. Therefore, by moving the fixed member forward and backward in the through hole, assembly and disassembly of the inner diameter side sleeve and the outer diameter side sleeve can be easily performed.

The inclined surface may be inclined so as to approach the one sleeve toward the insertion side end of the other sleeve.
This makes it possible to simultaneously restrict the inner sleeve and the outer sleeve from rotating relative to each other and restrict withdrawal of the inner sleeve and the outer sleeve.

The through hole may be inclined so as to be perpendicular to the inclined surface.
According to this, when the inner sleeve and the outer sleeve move in the removal direction, the fixing member is mainly subjected to a force component along the axial direction of the through hole, so that the fixing member can reliably restrict the relative rotation of the inner sleeve and the outer sleeve and the movement in the removal direction.

The through hole may be inclined with respect to a rising direction of the inclined surface.
According to this, the fixing member can regulate the relative rotation between the inner sleeve and the outer sleeve and regulate the movement in the removal direction.

The other sleeve may have a stopper portion that abuts against the abutted portion of the one sleeve in the axial direction.
According to this, when the tip of the fixing member is pressed against the inclined surface, the abutment portion of one sleeve and the stopper portion of the other sleeve are pressed against each other in the axial direction. Therefore, the relative rotation between the inner sleeve and the outer sleeve can be firmly restricted. Furthermore, the relative movement between the one sleeve and the other sleeve in both axial directions can be firmly restricted.

The inclined surface may be formed in an annular shape.
This allows the inner sleeve and the outer sleeve to be easily assembled regardless of the relative circumferential positions of the inner sleeve and the outer sleeve.

The through hole may have an inner circumferential surface provided with a female thread, and the fixing member may have a male thread that screws into the female thread.
This allows the inner sleeve and the outer sleeve to be easily assembled and disassembled.

The shaft seal device may further include a retaining screw for retaining the fixing member.
According to this, after the fixing member is screwed into the through hole, the locking screw is further screwed in to prevent the fixing member from loosening from the through hole. This simplifies the assembly and disassembly of the inner diameter side sleeve and the outer diameter side sleeve, while more reliably preventing the inner diameter side sleeve and the outer diameter side sleeve from coming loose.

1 is a cross-sectional view showing a shaft sealing device according to a first embodiment of the present invention. FIG. 4 is an explanatory diagram showing the assembly of the stationary seal ring and the sleeve. 6 is an explanatory diagram showing the fixing of the first sleeve and the second sleeve. FIG. 13 is a view of the first sleeve as seen from the other axial end. FIG. 5A to 5C are schematic diagrams showing the time series of fixing of the first sleeve and the second sleeve together. FIG. 1A is a cross-sectional view showing the set screw of Example 1, FIG. 1B is a cross-sectional view showing a first modified set screw, FIG. 1C is a cross-sectional view showing a second modified set screw, FIG. 1D is a cross-sectional view showing a third modified set screw, and FIG. 1E is a cross-sectional view showing a fourth modified set screw. FIG. 6 is a cross-sectional view showing a shaft sealing device according to a second embodiment of the present invention. FIG. 11 is a cross-sectional view showing a shaft sealing device according to a third embodiment of the present invention. FIG. 11 is a cross-sectional view showing a fifth modified example of the first embodiment. FIG. 13 is a cross-sectional view showing a sixth modified example of the first embodiment.

The following describes the embodiment of the shaft seal device according to the present invention.

The shaft seal device according to the first embodiment will be described with reference to Figures 1 to 5. Note that Figures 1 to 3 show cross sections cut at different angles from the center axis of the sleeve at the top and bottom of the page.

The shaft seal device of this embodiment is a mechanical seal 1 used in automobiles, general industrial machinery, etc. The mechanical seal 1 is for sealing the sealed fluid L contained on the inside M side of the shaft seal part in a pump or the like. The left side of FIG. 1 is the inside M side area that contains the sealed fluid L, and the right side of FIG. 1 is the outside A side area of the atmospheric atmosphere. The outside A side is called one end side, and the inside M side is called the other end side. The outside A side is described as the direction in which the first sleeve 11 comes out and the direction in which the second sleeve 21 is inserted, and the inside M side is described as the direction in which the first sleeve 11 is inserted and the direction in which the second sleeve 21 comes out.

The mechanical seal 1 is mainly composed of a casing 2, a rotating shaft 3, a sleeve 10, a rotating seal ring 30 as the other sliding part, and a stationary seal ring 40 as one of the sliding parts.

The casing 2 is attached to the housing of the shaft seal of the rotating equipment. The rotating shaft 3 is inserted through the casing 2. The sleeve 10 is inserted and fixed to the rotating shaft 3 so that it can be detached. The stationary seal ring 40 is fixed to the sleeve 10. The stationary seal ring 40 is held in the casing 2 so that it can move in the axial direction. A spring (not shown) is interposed between the casing 2 and the stationary seal ring 40, and urges the stationary seal ring 40 toward the rotating seal ring 30.

The sealing end face of the rotating seal ring 30 and the sealing end face of the stationary seal ring 40 form a sealing portion S1 in sliding contact with each other. The sealing portion S1 seals the sealed fluid L leaking from the inside of the machine M side to the outside of the machine A side. The rotation of the stationary seal ring 40 is restricted by a knock pin 41 fixed to the casing 2. An O-ring G10 is interposed between the stationary seal ring 40 and the casing 2.

The casing 2 has a mounting flange for attachment to the housing of a rotating device (not shown).

The sleeve 10 is mainly composed of a first sleeve 11, which is an inner diameter sleeve as one sleeve, and a second sleeve 21, which is an outer diameter sleeve as the other sleeve. The first sleeve 11 is arranged on the outside A side of the machine, and the second sleeve 21 is arranged on the inside M side of the machine. The first sleeve 11 and the second sleeve 21 are connected in the axial direction by a set screw 4, which serves as a fixing member.

Referring to FIG. 2, the second sleeve 21 is made of a high-nickel alloy that has excellent corrosion resistance, and the inner circumferential surface 22a of the end portion 22 on one end side is formed to have a larger diameter than the inner circumferential surface 22b of the center portion. The inner circumferential surfaces 22a and 22b extend parallel to each other. Between the inner circumferential surfaces 22a and 22b, an inner surface 22c is formed as a stopper portion that is perpendicular to the inner circumferential surfaces 22a and 22b.

A ring-shaped recess 23 is formed in the axial center of the inner peripheral surface 22a of the end portion 22 as a recess that is recessed toward the outer diameter side. The ring-shaped recess 23 is defined by a horizontal surface 23a and inclined surfaces 23b and 23c. The horizontal surface 23a extends axially and annularly. The inclined surfaces 23b and 23c extend annularly at an angle from both axial ends of the horizontal surface 23a.

More specifically, the inclined surface 23b on one end side extends from the edge of the horizontal surface 23a toward the one end side so that its diameter decreases. The inclined surface 23c on the other end side extends from the edge of the horizontal surface 23a toward the other end side so that its diameter decreases.

The horizontal surface 23a and the inclined surfaces 23b and 23c are straight lines in cross section, but may also be curved surfaces.

In addition, multiple keys 24 are provided in the circumferential direction on the outer periphery of the end portion 22. The keys 24 protrude toward the outer diameter side. These keys 24 are adapted to be fitted into multiple fitting grooves 31 provided on the inner periphery of the rotating seal ring 30 (see FIG. 1). The keys 24 may be configured separately from the second sleeve 21.

The first sleeve 11 is made of stainless steel and has, from the other end, a small diameter section 11A, a first step section 11B, a second step section 11C, and a large diameter section 11D. The first step section 11B has a larger diameter than the small diameter section 11A. The second step section 11C has a larger diameter than the first step section 11B. The large diameter section 11D has a larger diameter than the second step section 11C. In other words, the first sleeve 11 is formed with a stepped cross section.

Through holes 14 are formed in the small diameter portion 11A, penetrating in the radial direction. The through holes 14 are linearly inclined toward one end as they approach the outer diameter side. The through holes 14 have a female thread portion 14a on the inner peripheral surface. In this embodiment, the through holes 14 are equally spaced at 10 positions in the circumferential direction of the small diameter portion 11A (see FIG. 4).

The outer peripheral surface of the first step 11B is the mounting portion for the O-ring G22. The outer peripheral surface of the second step 11C is the fitting surface into which the inner peripheral surface 32a of one end side of the main body 32 of the rotating seal ring 30 fits. The large diameter portion 11D is a flange portion extending radially outward, and the side surface 18b on the other end side is abutted by the side surface 32b of one end side of the main body 32 of the rotating seal ring 30 to position the rotating seal ring 30 in the axial direction.

The outer diameter of the small diameter portion 11A is formed to be approximately the same as the inner diameter of the end portion 22 of the second sleeve 21, so that the first sleeve 11 and the second sleeve 21 are joined together by a so-called spigot joint.

As shown in FIG. 6(a), the set screw 4 of this embodiment has a male thread 4c on its outer circumferential surface, and can be screwed into the female thread 14a of the through hole 14. The tip of the set screw 4 has a conical recess in the center, and the annular tip surface 4a has multiple projections and recesses formed along the circumferential direction. The rear end of the set screw 4 is also formed with an operating recess 4b into which a tool for screwing the set screw 4 is fitted.

Here, the assembly of the first sleeve 11 and the second sleeve 21 will be generally described. As shown in FIG. 2, the second sleeve 21 is inserted into the casing 2, and an O-ring G21 is placed on the inner circumference of the first sleeve 11. An O-ring G22 is inserted axially into the first step 11B and attached, and a rotating seal ring 30 is inserted axially into the second step 11C and attached. At this time, the set screw 4 is screwed into the through hole 14 of the first sleeve 11 in advance.

Next, as shown in FIG. 3, the fitting grooves 31 of the rotary seal ring 30 are aligned with the keys 24 of the second sleeve 21 in the circumferential direction, and then the first sleeve 11 is inserted inside the end 22 of the second sleeve 21.

Then, the set screw 4 is screwed toward the outer diameter side, so that the first sleeve 11 and the second sleeve 21 are connected in the axial direction while their relative rotation and relative axial movement are restricted, and the sleeve 10 is formed.

In this embodiment, the first sleeve 11 and the second sleeve 21 are connected by the set screw 4, and then the retaining screw 5 is screwed into the through hole 14 from the inner diameter side. The specific connection and fixation of the set screw 4 will be described later.

When the sleeve 10 is constructed, the rotation of the rotating seal ring 30 is restricted by the engagement of its engagement groove 31 with the key 24 of the second sleeve 21.

Next, as shown in Figures 2 and 3, the rotating shaft 3 is inserted into the sleeve 10, and the rotating shaft 3 and the sleeve 10 are fixed together.

As an assembly procedure, in Figs. 2 and 3, an example is described in which the first sleeve 11 is assembled to the second sleeve 21 with the second sleeve 21 inserted into the casing 2, but it is also possible to insert the sleeve 10 into the casing 2 after assembling the first sleeve 11 and the second sleeve 21.

Referring to FIG. 1, an O-ring G4 is disposed on the inner circumference of the second sleeve 21, sealing the space between the second sleeve 21 and the rotating shaft 3. The first sleeve 11 is removably fixed to the rotating shaft 3 using a shaft fixing member (not shown). The first sleeve 11 may be fixed to the rotating shaft 3 by other means, for example, a means using a set screw. In this embodiment, the first sleeve 11 is fixed to the rotating shaft 3, but the second sleeve 21 may be fixed to the rotating shaft 3, or both the first sleeve 11 and the second sleeve 21 may be fixed to the rotating shaft 3.

Next, the process for connecting the first sleeve 11 and the second sleeve 21 with the set screw 4 will be explained in detail with reference to FIG. 5.

As shown in FIG. 5(a), when connecting the first sleeve 11 and the second sleeve 21, the first sleeve 11 is inserted into the inside of the end 22 of the second sleeve 21 until the insertion end 11a of the small diameter portion 11A of the first sleeve 11 abuts against the inner surface 22c of the end 22 of the second sleeve 21. The insertion end 11a is the abutted portion that abuts against the inner surface 22c of the second sleeve 21.

When the insertion end 11a of the first sleeve 11 abuts against the inner surface 22c of the second sleeve 21, the through hole 14 is positioned so that it overlaps the inner diameter side of the inclined surface 23b of the annular recess 23. The through hole 14 is inclined so as to be perpendicular to the inclined surface 23b.

Next, as shown in FIG. 5(b), the set screw 4 is operated from the inner diameter side of the first sleeve 11 using a tool (not shown) and screwed toward the outer diameter side. This causes the set screw 4 to abut against the inclined surface 23b of the annular recess 23.

Then, when the set screw 4 is further screwed in, the tip of the set screw 4 moves slightly axially along the inclined surface 23b toward the other side, i.e., in the insertion direction. As a result, a force in the insertion direction acts on the first sleeve 11 from the set screw 4, and the insertion side end 11a is pressed axially against the inner surface 22c of the second sleeve 21 as shown by the black arrow in the figure.

Then, as shown in FIG. 5(c), the retaining screw 5 is screwed into the inner diameter side of the through hole 14 so that it contacts the rear end side of the set screw 4.

In this way, when the set screw 4 is pressed against the inclined surface 23b, the frictional force generated between the set screw 4 and the inclined surface 23b restricts the relative rotation of the first sleeve 11 and the second sleeve 21.

In addition, the pressure between the insertion end 11a of the first sleeve 11 and the inner surface 22c of the second sleeve 21, as indicated by the black arrow in Figure 5 (b), acts to more firmly restrict the relative rotation of the first sleeve 11 and the second sleeve 21.

Furthermore, the inclined surface 23b is inclined so as to approach the small diameter portion 11A of the first sleeve 11 toward one axial end, so that the tip of the set screw 4 is engaged with the inclined surface 23b in the axial direction, thereby preventing the first sleeve 11 and the second sleeve 21 from slipping out.

The through hole 14 is also inclined so as to be perpendicular to the inclined surface 23b. As a result, when the first sleeve 11 and the second sleeve 21 move in the direction of removal, the set screw 4 is mainly subjected to a force component along the axial direction of the through hole 14. Therefore, the set screw 4 can reliably regulate the relative rotation of the first sleeve 11 and the second sleeve 21 and the movement in the direction of removal.

Furthermore, the relative movement of the first sleeve 11 in the insertion direction is restricted by contact between the insertion end 11a and the inner surface 22c.

Furthermore, the use of the locking screw 5 prevents the set screw 4 from loosening relative to the through hole 14. This further ensures that the first sleeve 11 and the second sleeve 21 do not come loose. The locking screw 5 may be screwed into a location other than the through hole 14.

As described above, the set screw 4 is pressed against the inclined surface 23b to restrict the relative rotation of the first sleeve 11 and the second sleeve 21, and the tip of the set screw 4 is engaged with the inclined surface 23b in the axial direction to restrict the first sleeve 11 and the second sleeve 21 from coming out. Therefore, by moving the set screw 4 forward and backward through the through hole 14, the first sleeve 11 and the second sleeve 21 can be easily assembled and disassembled.

In addition, the inclined surface 23b is inclined so as to approach the first sleeve 11 as it approaches the insertion end of the second sleeve 21, i.e., the end on the one side, so that the relative rotation and removal of the first sleeve 11 and the second sleeve 21 can be restricted at the same time. In addition, the inclined surface 23b extends further from the abutment point with the set screw 4 toward the one end side, i.e., in the removal direction of the first sleeve 11. As a result, the abutment state between the inclined surface 23b and the set screw 4 is maintained even if the first sleeve 11 and the second sleeve 21 move relatively in the removal direction, so that the first sleeve 11 and the second sleeve 21 are reliably prevented from coming off.

In addition, the inclined surface 23b is formed in an annular shape in the circumferential direction. Therefore, the assembly work of the first sleeve 11 and the second sleeve 21 can be easily performed regardless of the relative circumferential positions of the first sleeve 11 and the second sleeve 21.

The through hole 14 has a female thread 14a on its inner circumferential surface, and the set screw 4 has a male thread 4c that screws into the female thread 14a. This allows the first sleeve 11 and the second sleeve 21 to be easily assembled and disassembled by screwing the set screw 4.

The first sleeve 11 is inserted inside the second sleeve 21. The O-ring G22 is in sealed contact with the first sleeve 11, the second sleeve 21, and the rotating seal ring 30. The first sleeve 11 and the second sleeve 21 are connected by threading the set screw 4 from the inner diameter side of the first sleeve 11 to the outer diameter side. With the above configuration, the first sleeve 11 and the set screw 4 are not exposed to the inside of the machine M, and are therefore prevented from being corroded by the sealed fluid L.

In this embodiment, the set screw 4 has a tip surface 4a with multiple projections and recesses, but the tip surface 4a may be flat.

In addition, the set screw is not limited to having a recessed tip, but may be as follows:

For example, as shown in FIG. 6(b), the set screw 4' may have a tip surface 4a' that is an annular narrow surface with no irregularities along the circumferential direction.

Alternatively, as shown in FIG. 6(c), the set screw 140 may have a flat tip 140a without any recess.

Also, as shown in FIG. 6(d), the set screw 240 may have a tip portion 240a that forms a convex curved cross section toward the tip side.

Also, as shown in FIG. 6(e), the set screw 340 may be cone-shaped with the tip 340a tapering toward the tip.

Next, the shaft seal device according to the second embodiment will be described with reference to FIG. 7. Note that the description of the same configuration as in the first embodiment will be omitted. Furthermore, in FIG. 7, the axial direction of the sleeve is indicated by the axis α, the axial direction of the first through hole is indicated by the imaginary line β, and the axial direction of the second through hole is indicated by the imaginary line γ.

As shown in FIG. 7, two recesses 423, 424 are provided circumferentially spaced apart on the inner circumference of the end portion 422 on one end side of the second sleeve 421 in this embodiment.

The inclined surface 423b on one end side of the recess 423 and the inclined surface 424b on one end side of the recess 424 are inclined at different angles with respect to the axis α.

The first sleeve 411 is provided with a first through hole 414 and a second through hole 415. The first through hole 414 extends perpendicular to the inclined surface 423b (see imaginary line β). In other words, the first through hole 414 is inclined at an angle θ1 with respect to the axis α.

The second through hole 415 extends perpendicular to the inclined surface 424b (see imaginary line γ). In other words, the second through hole 415 is inclined at an angle θ2, which is different from the angle θ1, with respect to the axis α.

If the angles θ1 and θ2 are less than 40 degrees, the set screw 4 will lean too far in the axial direction, reducing the radial fixing force, and if they are greater than 80 degrees, there is a risk that the axial fixing force will be reduced. Therefore, it is preferable to set the angles θ1 and θ2 in the range of 40 degrees to 80 degrees.

In addition, multiple recesses 423 and 424 may be provided.

In addition, the recesses 423 and 424 are not limited to being divided in the circumferential direction, and multiple inclined surfaces inclined at different angles on one end side of the annular recess may be arranged in the circumferential direction.

Next, the shaft seal device according to the third embodiment will be described with reference to FIG. 8. Note that the description of the same configuration as in the first embodiment will be omitted. Furthermore, in this third embodiment, the left side of FIG. 8 is the outside machine A side area of the atmospheric environment, and the right side of FIG. 8 is the inside machine M side area that contains the sealed fluid L. In addition, the outside machine A side will be described as the insertion direction of the first sleeve 211 and the removal direction of the second sleeve 221, and the inside machine M side will be described as the removal direction of the first sleeve 211 and the insertion direction of the second sleeve 221.

As shown in FIG. 8, the first sleeve 211 of the third embodiment has an annular recess 213 formed as a recess on the outer circumferential surface of the small diameter portion 211A. The inclined surface 213b on one end side of this annular recess 213 is inclined so as to expand in diameter toward the insertion end of the first sleeve 211, i.e., toward the one axial end side. In other words, the first sleeve 211 of the third embodiment functions as the other sleeve on which the inclined surface is formed. The first sleeve 211 of the third embodiment is formed from a high-nickel alloy that has excellent corrosion resistance.

The second sleeve 221 of Example 2 has a through hole 224 formed in the end portion 222 on one side of the second sleeve. In other words, the second sleeve 221 of Example 3 functions as one of the sleeves in which the through hole is formed. The second sleeve 221 of Example 3 is made of stainless steel.

The end face 222a of the end portion 222 contacts the side face 211b of the first step portion 211B of the first sleeve 211, thereby positioning the first sleeve 211 and the second sleeve 221 in the insertion direction. In other words, the side face 211b of the first sleeve 211 functions as a stopper portion, and the end face 222a of the second sleeve 221 functions as an abutment portion.

When the set screw 4 is pressed against the inclined surface 213b, the relative rotation between the first sleeve 211 and the second sleeve 221 is restricted, and the set screw 4 is engaged with the inclined surface 213b, restricting the movement of the first sleeve 211 and the second sleeve 221 in the direction of removal.

Furthermore, due to the reaction force from the inclined surface 213b, the end surface 222a of the second sleeve 221 is pressed against the side surface 211b of the first sleeve 211, and the relative rotation between the first sleeve 211 and the second sleeve 221 is further tightly restricted. In addition, the relative movement between the first sleeve 211 and the second sleeve 221 in the insertion direction is restricted.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

For example, in the above-mentioned Examples 1 to 3, the sleeve on the leakage side is made of stainless steel, and the sleeve on the sealed fluid side is made of a high-nickel alloy with excellent corrosion resistance, but the materials are not limited to these. The material of the sleeve on the leakage side and the sleeve on the sealed fluid side may be any suitable material depending on the application, and for example, iron, stainless steel, titanium, titanium alloy, or zirconium can be used.

In addition, in the above-mentioned Examples 1 to 3, the through hole is inclined so as to be perpendicular to the inclined surface, but this is not limited thereto, and the through hole may be inclined in the direction in which the inclined surface rises, i.e., in the perpendicular direction. Even in this case, when the set screw is pressed against the inclined surface, it is possible to restrict the relative rotation of the inner sleeve and the outer sleeve and to restrict the movement in the removal direction.

In addition, in the above-mentioned Examples 1 to 3, the set screw is prevented from loosening by a locking screw, but this is not limited to this. For example, as shown in FIG. 9, the set screw 4'' alone may be used to fix the set screw to the through hole 14 without using a locking screw.

In addition, in the above-mentioned Examples 1 to 3, a set screw that screws into the through hole is used as an example of the fixing member, but this is not limited thereto. For example, as shown in FIG. 10, a pin 400 that can advance and retreat into the through hole 614 and is fixed to the through hole 614 may be used. The pin 400 and the through hole 614 do not have a threaded portion, and the pin 400 is fixed to the first sleeve 11 by tightening the periphery of the through hole 614 from the inner diameter side.

In addition, in the above-mentioned Examples 1 to 3, the sleeve is configured from one inner diameter side sleeve and one outer diameter side sleeve, but the inner diameter side sleeve and the outer diameter side sleeve may be configured from multiple sleeve components.

In addition, in the above-mentioned Examples 1 to 3, the inner diameter side sleeve and the outer diameter side sleeve are connected only by the fixing member, but for example, in addition to the fixing member, the connection between the inner diameter side sleeve and the outer diameter side sleeve may be reinforced by a bolt extending in the axial direction. Furthermore, when the inner diameter side sleeve or the outer diameter side sleeve is composed of multiple sleeve components, a bolt extending in the axial direction may be used to connect the multiple sleeve components that make up the inner diameter side sleeve and to connect the multiple sleeve components that make up the outer diameter side sleeve.

In addition, in the above-mentioned Examples 1 to 3, the sleeve on the leakage side is inserted into the sleeve on the sealed fluid side, but as long as the sleeve on the leakage side is not exposed to the highly corrosive sealed fluid, the sleeve on the sealed fluid side may be inserted into the sleeve on the leakage side.

In addition, in the above embodiments 1 to 3, a single-type mechanical seal was described, but a double-type or tandem-type mechanical seal may also be used.

In addition, in the above embodiments 1 to 3, a mechanical seal was described as an example of a shaft seal device, but it does not have to be a mechanical seal. For example, it may be a shaft seal device used in bearings of automobiles, general industrial machinery, or machines in other bearing fields.

In addition, in the above embodiments 1 to 3, an outside-type mechanical seal is illustrated, but an inside-type mechanical seal may also be used.

1. Mechanical seal (shaft seal device)
2 Casing 3 Rotating shaft 4 Set screw (fixing member)
4c Male thread portion 5 Locking screw 10 Sleeve 11 First sleeve (inner diameter side sleeve, one sleeve)
11a Insertion side end (abutted part)
14 Through hole 14a Female screw portion 21 Second sleeve (outer diameter side sleeve, other sleeve)
22c Inner surface (stopper portion)
23 Annular recess (recess)
23b Inclined surface 30 Rotating sealing ring 40 Stationary sealing ring A Outside the machine L Sealed fluid M Inside the machine

Claims (7)

one sliding part held in a casing through which a rotating shaft is inserted;
an inner diameter side sleeve and an outer diameter side sleeve that are inserted and fixed to the rotating shaft;
A shaft seal device comprising: a sliding component that is held by the inner diameter side sleeve or the outer diameter side sleeve and slides relative to the one sliding component,
The inner sleeve is partially inserted into the outer sleeve,
One of the sleeves has a through hole extending therethrough in the radial direction,
a recess is formed in the other sleeve to define a space between the other sleeve and the one sleeve;
The recess has an inclined surface,
a fixing member that abuts against the inclined surface and is fixed to the through hole is inserted into the through hole,
The inclined surface is formed in an annular shape. The shaft seal device according to claim 1, wherein the inclined surface is inclined so as to approach the one sleeve as it approaches the insertion end of the other sleeve. The shaft seal device according to claim 1 or 2, wherein the through hole is inclined so as to be perpendicular to the inclined surface. The shaft seal device according to claim 1 or 2, wherein the through hole is inclined with respect to the rising direction of the inclined surface. A shaft seal device according to any one of claims 1 to 4, wherein the other sleeve has a stopper portion that abuts against the abutted portion of the one sleeve in the axial direction. 6. The shaft seal device according to claim 1 , wherein an internal thread is provided on an inner peripheral surface of the through hole, and the fixing member has an external thread that screws into the internal thread. The shaft seal device according to claim 6 , further comprising a retaining screw for retaining the fixing member.

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