JP2023016140A - Shaft seal device - Google Patents

Abstract

To provide a shaft seal device which enables assembly work and disassembly work to be performed easily.SOLUTION: An inner diameter side sleeve 11 is partially inserted into an outer diameter side sleeve 21 and one of the sleeves 11 is formed with a through hole 14 penetrating through the sleeve 11 in a radial direction. The other sleeve 21 is formed with a recessed part 23 defining a space with the one sleeve 11. An inclined surface 23b is provided at the recessed part 23. A fixture member 4 which is movable toward the inclined surface 23b and fixed to the through hole 14 is inserted into the through hole 14.SELECTED DRAWING: Figure 5

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft sealing device for sealing between a rotating shaft of a rotary machine and a casing.

As a shaft sealing device for preventing leakage of a sealed fluid around a rotary shaft in a rotary machine, for example, one sliding part held by a casing and a cylindrical sleeve inserted through the casing and fixed to the rotary shaft are used. , and the other sliding part fixed to a sleeve, and a mechanical seal in which the pair of sliding parts slide relative to each other is known. In such a mechanical seal, in order to improve maintainability, one sleeve member contacts a highly corrosive sealed fluid, and the other sleeve member contacts a fluid different from the sealed fluid, such as the atmosphere, A sleeve with a split structure composed of is sometimes used.

For example, in the shaft sealing device disclosed in Patent Literature 1, the sleeve is composed of a first sleeve as an outer diameter side sleeve outside the machine and a second sleeve as an inner diameter side sleeve inside the machine. The first sleeve and the second sleeve are connected in the axial direction by screwing a male thread provided on the outer periphery of the second sleeve into a female thread provided on the inner periphery of the end of the first sleeve. there is In addition, since the relative rotation between the first sleeve and the second sleeve is restricted by inserting the pin through the through hole of the first sleeve and the through hole of the second sleeve that are aligned in the axial direction and the circumferential direction, Loosening of the threaded engagement between the first sleeve and the second sleeve is prevented.

In this way, since the first sleeve and the second sleeve are detachably attached, when the second sleeve arranged on the side of the sealed fluid with high corrosivity needs to be replaced due to corrosion or the like, the second sleeve can be replaced. Only two sleeves are exchanged, and the first sleeve which does not need to be exchanged can continue to be used as it is. Therefore, maintenance workability is excellent.

JP 2018-71566 A (page 6, FIG. 3)

In the shaft sealing device of Patent Document 1, the first and second sleeves are reliably maintained in a connected state by the screwing of the first and second sleeves and the rotation stop by the pin. It is possible. However, when assembling the first sleeve and the second sleeve, while connecting the first sleeve and the second sleeve in the axial direction by screwing, the through hole of the first sleeve for inserting the pin and the through hole of the second sleeve are required. It was necessary to align the relative positions of the through holes of the sleeve in the axial direction and the circumferential direction, and the work of assembling the first sleeve and the second sleeve was complicated. Moreover, when disassembling the first sleeve and the second sleeve, it is necessary to unscrew the first sleeve and the second sleeve and remove the pin, so the disassembly work is also complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shaft seal device that can be easily assembled and disassembled.

In order to solve the above problems, the shaft sealing device of the present invention includes:
one sliding part held by a casing through which the 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 sealing device comprising: a sliding part held by the inner diameter side sleeve or the outer diameter side sleeve and sliding relative to the one sliding part, the shaft sealing device comprising:
The inner diameter side sleeve is partially inserted into the outer diameter side sleeve,
One sleeve is provided with a through-hole that penetrates in the radial direction,
The other sleeve is formed with a recess defining a space with the one sleeve,
The recess is provided with an inclined surface,
A fixing member that abuts against the inclined surface and is fixed to the through hole is inserted through the through hole.
According to this, the distal end portion of the fixing member is radially pressed against the inclined surface, thereby restricting the relative rotation between the inner diameter side sleeve and the outer diameter side sleeve, and the distal end portion of the fixing member is inclined in the axial direction. By engaging with the surface, the inner diameter side sleeve and the outer diameter side sleeve are prevented from coming off. Therefore, by moving the fixing member back and forth through the through hole, the work of assembling and disassembling 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.
According to this, it is possible to simultaneously restrict the relative rotation of the inner diameter side sleeve and the outer diameter side sleeve and the restriction of the slippage thereof.

The through hole may be inclined so as to be perpendicular to the inclined surface.
According to this, when the inner diameter side sleeve and the outer diameter side sleeve move in the detachment direction, a component of force mainly along the axial direction of the through hole acts on the fixing member. Therefore, it is possible to reliably restrict the relative rotation of the inner diameter side sleeve and the outer diameter side sleeve and the movement in the withdrawal direction by the fixing member.

The through-hole may be inclined with respect to the upright direction of the inclined surface.
According to this, it is possible to restrict the relative rotation of the inner diameter side sleeve and the outer diameter side sleeve and restrict the movement in the withdrawal direction by the fixing member.

The other sleeve may have a stopper portion axially abutting against the abutted portion of the one sleeve.
According to this, when the distal end portion of the fixing member is pressed against the inclined surface, the abutted portion of one sleeve and the stopper portion of the other sleeve are axially pressed against each other. Therefore, the relative rotation between the inner diameter side sleeve and the outer diameter side sleeve can be strongly restricted. Furthermore, the one sleeve and the other sleeve can strongly restrict the relative movement to both sides in the axial direction.

The inclined surface may be formed in an annular shape.
According to this, the work of assembling the inner diameter side sleeve and the outer diameter side sleeve can be easily performed regardless of the relative positions of the inner diameter side sleeve and the outer diameter side sleeve in the circumferential direction.

A female threaded portion may be provided on an inner peripheral surface of the through hole, and the fixing member may have a male threaded portion screwed into the female threaded portion.
According to this, it is possible to easily perform assembly work and disassembly work of the inner diameter side sleeve and the outer diameter side sleeve.

The shaft sealing device may further include a retainer screw that retains the fixing member.
According to this, the fixing member is prevented from loosening with respect to the through hole by further screwing the retaining screw after the fixing member is screwed into the through hole. As a result, the inner diameter sleeve and the outer diameter sleeve can be easily assembled and disassembled, and the removal of the inner diameter sleeve and the outer sleeve is more reliably restricted.

1 is a cross-sectional view showing a shaft sealing device in Example 1 of the present invention; FIG. FIG. 4 is an explanatory diagram showing assembly of a stationary seal ring and a sleeve; FIG. 5 is an explanatory diagram showing fixing of the first sleeve and the second sleeve; FIG. 4 is a view of the first sleeve viewed from the other end in the axial direction; (a) to (c) are schematic diagrams showing the fixation of the first sleeve and the second sleeve in chronological order. (a) is the set screw of the first embodiment, (b) is the set screw modification 1, (c) is the set screw modification 2, (d) is the set screw modification 3, and (e) is the set screw It is a cross-sectional view showing a modification 4 of. FIG. 5 is a cross-sectional view showing a shaft sealing device in Example 2 of the present invention; FIG. 5 is a cross-sectional view showing a shaft sealing device in Example 3 of the present invention; FIG. 10 is a cross-sectional view showing Modification 5 of Example 1; FIG. 11 is a cross-sectional view showing Modification 6 of Example 1;

A mode for carrying out a shaft sealing device according to the present invention will be described below based on an embodiment.

A shaft sealing device according to a first embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 to 3 show cross sections cut at different angles from the central axis of the sleeve to the upper part and the lower part of the paper.

The shaft sealing device of this embodiment is a mechanical seal 1 used in automobiles, general industrial machines, and the like. The mechanical seal 1 is for sealing the sealed fluid L accommodated in the inside M side of the shaft seal portion of a pump or the like. The left side of FIG. 1 is the region on the side of the machine M containing the sealed fluid L, and the right side of FIG. 1 is the region on the side of the outside A of the air atmosphere. Further, the outside A side is called one end side, and the inside M side is called the other end side. In addition, the outside A side will be described as the direction in which the first sleeve 11 is pulled out and the direction in which the second sleeve 21 is inserted, and the inside M side will be described as the direction in which the first sleeve 11 is inserted and the direction in which the second sleeve 21 is pulled 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 sliding part. there is

The casing 2 is attached to the housing of the shaft seal portion of the rotating equipment. The rotating shaft 3 is inserted through the casing 2 . The sleeve 10 is detachably inserted through and fixed to the rotary shaft 3 . A stationary seal ring 40 is fixed to the sleeve 10 . A stationary seal ring 40 is held axially movably in the casing 2 . A spring (not shown) is interposed between the casing 2 and the stationary seal ring 40 to bias the stationary seal ring 40 toward the rotary seal ring 30 .

The sealing end face of the rotary seal ring 30 and the sealing end face of the stationary seal ring 40 form a sealing portion S1 which is in sliding contact. The sealed portion S1 seals the sealed fluid L that leaks from the inside M side to the outside A side of the machine. 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. As shown in FIG.

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

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

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

An annular recess 23 as a recess recessed toward the outer diameter side is formed in the axial center of the inner peripheral surface 22a of the end portion 22 . The annular concave portion 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 in an annular shape at an angle from both axial ends of the horizontal surface 23a.

Specifically, the inclined surface 23b on the one end side extends from the edge of the horizontal surface 23a so as to reduce in diameter toward the one end side. The inclined surface 23c on the other end side extends so as to reduce in diameter from the edge of the horizontal surface 23a toward the other end side.

Although the horizontal surface 23a and the inclined surfaces 23b and 23c are linear in cross section, they may be curved surfaces.

A plurality of keys 24 are provided in the circumferential direction on the outer periphery of the end portion 22 . The key 24 protrudes radially outward. The key 24 is fitted into a plurality of fitting grooves 31 provided on the inner circumference of the rotary seal ring 30 (see FIG. 1). Note that the key 24 may be configured separately from the second sleeve 21 .

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

A through hole 14 penetrating in the radial direction is formed in the small diameter portion 11A. The through hole 14 is linearly inclined toward one end side as it goes to the outer diameter side. The through hole 14 has a female screw portion 14a on its inner peripheral surface. In this embodiment, 10 through-holes 14 are evenly distributed in the circumferential direction of the small-diameter portion 11A (see FIG. 4).

The outer peripheral surface of the first stepped portion 11B serves as a mounting portion for an O-ring G22. The outer peripheral surface of the second stepped portion 11C serves as a fitting surface into which the inner peripheral surface 32a on the one end side of the body portion 32 of the rotary seal ring 30 is fitted. The large-diameter portion 11D is a flange portion extending radially outward, and a side surface 32b on one end side of the body portion 32 of the rotary seal ring 30 abuts against a side surface 18b on the other end side to position the rotary seal ring 30 in the axial direction. ing.

The outer diameter of the small-diameter portion 11A is formed to have substantially the same size as the inner diameter of the end portion 22 of the second sleeve 21, and the first sleeve 11 and the second sleeve 21 are so-called spigot joint. It's like

Further, as shown in FIG. 6A, the set screw 4 of this embodiment has a male threaded portion 4c on its outer peripheral surface, which can be screwed into a female threaded portion 14a of the through hole 14. As shown in FIG. The tip of the set screw 4 has a conical depression at the center, and the annular tip surface 4a has a plurality of irregularities along the circumferential direction. Further, at the rear end of the set screw 4, an operating recess 4b is formed in which a tool for threading the set screw 4 is fitted.

Here, assembly of the first sleeve 11 and the second sleeve 21 will be schematically described. As shown in FIG. 2, the second sleeve 21 is inserted into the casing 2, the O-ring G21 is arranged on the inner circumference of the first sleeve 11, and the O-ring G22 is axially inserted into the first step portion 11B. Then, the rotary seal ring 30 is axially inserted into the second stepped portion 11C. 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, each fitting groove 31 of the rotary seal ring 30 and each key 24 of the second sleeve 21 are aligned in the circumferential direction, and then the first sleeve 11 is aligned with the second sleeve 21. Insert inside end 22 .

After that, by screwing the set screw 4 to the outer diameter side, the first sleeve 11 and the second sleeve 21 are axially connected in a state in which relative rotation and relative movement in the axial direction are restricted, and the sleeve 10 is formed. be done.

Further, in this embodiment, after the first sleeve 11 and the second sleeve 21 are connected by the set screw 4, the retainer screw 5 is screwed from the inner diameter side of the through hole 14. As shown in FIG. A specific description of the connection and fixation of the set screw 4 will be given later.

In the state in which the sleeve 10 is constructed, the relative rotation of the rotary seal ring 30 is restricted by the engagement between the engagement groove 31 and the key 24 of the second sleeve 21 .

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

2 and 3, an example of assembling the first sleeve 11 to the second sleeve 21 with the second sleeve 21 inserted into the casing 2 has been described as an assembly procedure. The sleeve 10 may be inserted into the casing 2 after the second sleeve 21 is assembled.

Referring to FIG. 1, the second sleeve 21 has an O-ring G4 arranged on its inner periphery, and is sealed with the rotating shaft 3. As shown in FIG. The first sleeve 11 is detachably fixed to the rotary shaft 3 using a shaft fixing member (not shown). The first sleeve 11 may be fixed to the rotating shaft 3 by other means, such as a means using a set screw. Also, 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, and both the first sleeve 11 and the second sleeve 21 may be fixed to the rotating shaft 3. may be fixed to the rotating shaft 3.

Next, a series of flow when connecting the first sleeve 11 and the second sleeve 21 with the set screw 4 will be specifically described with reference to FIG.

As shown in FIG. 5A, when connecting the first sleeve 11 and the second sleeve 21, the insertion side end portion 11a of the small diameter portion 11A of the first sleeve 11 is connected to the end portion of the second sleeve 21. The first sleeve 11 is inserted inside the end 22 of the second sleeve 21 until it abuts against the inner surface 22c of the second sleeve 22 . The insertion side end portion 11 a is a contacted portion that contacts the inner side surface 22 c of the second sleeve 21 .

When the insertion end 11a of the first sleeve 11 is in contact with the inner side surface 22c of the second sleeve 21, the through hole 14 overlaps the inner diameter side of the inclined surface 23b of the annular recess 23. As shown in FIG. In addition, the through hole 14 is inclined so as to be perpendicular to the inclined surface 23b.

Next, as shown in FIG. 5(b), a tool (not shown) is used to operate the set screw 4 from the inner diameter side of the first sleeve 11 and screw it toward the outer diameter side. As a result, the set screw 4 comes into contact with the inclined surface 23 b of the annular recess 23 .

After that, when the set screw 4 is further screwed, the tip of the set screw 4 moves slightly along the inclined surface 23b in the other axial direction, that is, in the insertion direction. As a result, a force in the insertion direction was applied from the set screw 4 to the first sleeve 11, and the insertion side end portion 11a was pressed against the inner surface 22c of the second sleeve 21 in the axial direction as indicated by the black arrow in the drawing. state.

After that, as shown in FIG. 5(c), the retainer screw 5 is screwed from the inner diameter side of the through hole 14 and brought into contact with the rear end side of the set screw 4. Then, as shown in FIG.

Thus, when the set screw 4 is pressed against the inclined surface 23b, the relative rotation of the first sleeve 11 and the second sleeve 21 is restricted by the frictional force generated between the set screw 4 and the inclined surface 23b.

In addition, the pressure contact force between the insertion side end portion 11a of the first sleeve 11 and the inner surface 22c of the second sleeve 21, indicated by a black arrow in FIG. Relative rotation of the sleeve 21 is regulated more firmly.

Furthermore, since the inclined surface 23b is inclined toward one end in the axial direction so as to approach the small diameter portion 11A of the first sleeve 11, the tip of the set screw 4 is locked to the inclined surface 23b in the axial direction. detachment of the first sleeve 11 and the second sleeve 21 is restricted.

Further, the through hole 14 is inclined so as to be perpendicular to the inclined surface 23b. According to this, when the first sleeve 11 and the second sleeve 21 move in the direction in which the first sleeve 11 and the second sleeve 21 are pulled out, a force component along the axial direction of the through hole 14 mainly acts on the set screw 4 . 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 withdrawal direction.

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

Furthermore, since the retaining screw 5 is used, the set screw 4 is prevented from loosening with respect to the through hole 14 . Therefore, the removal of the first sleeve 11 and the second sleeve 21 is restricted more reliably. Incidentally, the set screw 5 may be screwed into a place other than the through hole 14 .

As described above, since the set screw 4 is pressed against the inclined surface 23b, the relative rotation of the first sleeve 11 and the second sleeve 21 is restricted, and the tip of the set screw 4 in the axial direction is located on the inclined surface 23b. By being locked to the first sleeve 11 and the second sleeve 21, coming off is restricted. Therefore, by advancing and retreating the set screw 4 into and out of the through hole 14, the work of assembling and disassembling the first sleeve 11 and the second sleeve 21 can be easily performed.

In addition, since the inclined surface 23b is inclined so as to approach the first sleeve 11 toward the insertion-side distal end portion of the second sleeve 21, that is, the end portion on the one end side, the first sleeve 11 and the second sleeve 21 are inclined relative to each other. Rotation control and escape control can be performed at the same time. In addition, the inclined surface 23b extends further from the point of contact with the set screw 4 toward one end side, that is, in the withdrawal direction of the first sleeve 11. As shown in FIG. As a result, the inclined surface 23b and the set screw 4 are kept in contact with each other even when the first sleeve 11 and the second sleeve 21 move relative to each other in the withdrawal direction. 21 are reliably retained.

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

A female threaded portion 14a is provided on the inner peripheral surface of the through hole 14, and the set screw 4 has a male threaded portion 4c that is screwed into the female threaded portion 14a. According to this, by screwing the set screw 4, the work of assembling and disassembling the first sleeve 11 and the second sleeve 21 can be easily performed.

Also, the first sleeve 11 is inserted inside the second sleeve 21 . Also, the O-ring G22 is in sealing contact with the first sleeve 11, the second sleeve 21, and the rotary seal ring 30. As shown in FIG. The first sleeve 11 and the second sleeve 21 are connected by screwing 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 machine interior M side, so that they are prevented from being corroded by the sealed fluid L.

Although the set screw 4 of this embodiment has a plurality of irregularities on the tip surface 4a, the tip surface 4a may be flat.

Moreover, the set screw is not limited to the configuration in which the tip portion is recessed, and may be of the following type.

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

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

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

Alternatively, as shown in FIG. 6(e), the set screw 340 may be a conical set screw 340 in which the tip portion 340a is tapered toward the tip side.

Next, a shaft sealing device according to Example 2 will be described with reference to FIG. It should be noted that descriptions of configurations that are the same as those of the first embodiment will be omitted. Further, 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 phantom line β, and the axial direction of the second through hole is indicated by the phantom line γ.

As shown in FIG. 7, two recessed portions 423 and 424 are provided in the inner circumference of the end portion 422 on the one end side of the second sleeve 421 of the second embodiment, spaced apart in the circumferential direction.

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

A first through hole 414 and a second through hole 415 are provided in the first sleeve 411 . The first through hole 414 extends perpendicularly to the inclined surface 423b (see virtual 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 phantom line γ). In other words, the second through hole 415 is inclined at an angle θ2 different from the angle θ1 with respect to the axis α.

If the angles .theta.1 and .theta.2 are less than 40 degrees, the setscrew 4 is tilted too much in the axial direction and the fixing force in the radial direction is reduced. be. Therefore, the angles θ1 and θ2 are preferably set within the range of 40 degrees to 80 degrees.

A plurality of 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 a plurality of inclined surfaces that are inclined at different angles on one end side of the annular recess may be arranged in the circumferential direction.

Next, a shaft sealing device according to Example 3 will be described with reference to FIG. It should be noted that descriptions of configurations that are the same as those of the first embodiment will be omitted. Furthermore, in the present embodiment 3, the left side of FIG. 8 is the area on the outside A side of the air atmosphere, and the right side of FIG. Further, the outside A side is defined as the insertion direction of the first sleeve 211 and the withdrawal direction of the second sleeve 221 , and the machine interior M side is defined as the withdrawal 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 Example 3 has an annular recess 213 as a recess formed on the outer peripheral surface of the small diameter portion 211A. The inclined surface 213b on the one end side of the annular concave portion 213 is inclined so as to increase in diameter toward the insertion side tip portion of the first sleeve 211, that is, toward the one end side in the axial direction. That is, the first sleeve 211 of Example 3 functions as the other sleeve on which the inclined surface is formed. It should be noted that the first sleeve 211 of the third embodiment is made of a high-nickel alloy that is highly corrosive.

Further, the second sleeve 221 of Example 2 has a through hole 224 formed in an end portion 222 on the one end side thereof. That is, the second sleeve 221 of Example 3 functions as one sleeve in which the through hole is formed. Incidentally, the second sleeve 221 of the third embodiment is made of stainless steel.

The end surface 222a of the end portion 222 contacts the side surface 211b of the first stepped portion 211B of the first sleeve 211 to position the first sleeve 211 and the second sleeve 221 in the insertion direction. In other words, the side surface 211b of the first sleeve 211 functions as a stopper portion, and the end surface 222a of the second sleeve 221 functions as a contacted portion.

Since 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 regulated, and the set screw 4 is locked by the inclined surface 213b. 2 sleeve 221 is restricted from moving in the withdrawal direction.

In addition, the end surface 222a of the second sleeve 221 is pressed against the side surface 211b of the first sleeve 211 by the reaction force from the inclined surface 213b, and the relative rotation between the first sleeve 211 and the second sleeve 221 is further strongly restricted. . In addition, relative movement in the insertion direction between the first sleeve 211 and the second sleeve 221 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 any changes or additions within the scope of the present invention are included in the present invention. be

For example, in 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. It is not possible to be The material of the sleeve on the leak side and the sleeve on the sealed fluid side may be a suitable material depending on the application. For example, iron material, stainless steel material, titanium material, titanium alloy material, and zirconium material can be used.

Further, in Examples 1 to 3, the form in which the through-hole is inclined so as to be perpendicular to the inclined surface was exemplified. You may incline with respect to. 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 diameter side sleeve and the outer diameter side sleeve and restrict the movement in the removal direction.

Further, in Examples 1 to 3, the set screw is prevented from loosening by a locking screw, but this is not restrictive. For example, as shown in FIG. '' may be fixed to the through hole 14 only.

Further, in Examples 1 to 3, a set screw to be screwed into a through hole was exemplified as a fixing member, but the fixing member is not limited to this. For example, as shown in FIG. , and a pin 400 or the like fixed to the through hole 614 . The pin 400 and the through hole 614 are not threaded, and the pin 400 is fixed to the first sleeve 11 by crimping the periphery of the through hole 614 from the inner diameter side.

In addition, in Examples 1 to 3, the sleeve is composed of one inner diameter side sleeve and one outer diameter side sleeve. may be configured.

Further, in Examples 1 to 3, the configuration in which the inner diameter side sleeve and the outer diameter side sleeve are connected only by the fixing member was exemplified. The connection with the diameter side sleeve may be reinforced. In addition, when the inner diameter side sleeve and the outer diameter side sleeve are composed of a plurality of sleeve constituent members, the connection between the plurality of sleeve constituent members constituting the inner diameter side sleeve and the plurality of sleeve constituent members constituting the outer diameter side sleeve Axial bolts may be used to connect the members.

Further, in Examples 1 to 3, the sleeve on the leakage side is inserted into the sleeve on the side of the sealed fluid. The sealing fluid side sleeve may be inserted into the leak side sleeve.

Further, although the single-type mechanical seal is described in Examples 1 to 3, a double-type or tandem-type mechanical seal may be used.

Further, in the first to third embodiments, the mechanical seal was explained as an example of the shaft sealing device, but the mechanical seal may not be used. For example, it may be a shaft seal device used for bearings in automobiles, general industrial machines, or other machines in the bearing field.

Further, in Examples 1 to 3, an outside type mechanical seal is exemplified, but an inside type mechanical seal may be used.

1 Mechanical seal (shaft seal device)
2 casing 3 rotating shaft 4 set screw (fixing member)
4c Male threaded portion 5 Retaining screw 10 Sleeve 11 First sleeve (inner sleeve, one sleeve)
11a insertion side end (abutted portion)
14 through hole 14a female threaded portion 21 second sleeve (outer diameter side sleeve, other sleeve)
22c inner surface (stopper portion)
23 Annular recess (recess)
23b Inclined surface 30 Rotating seal ring 40 Stationary seal ring A Outside L Sealed fluid M Inside machine

Claims (8)

one sliding part held by a casing through which the 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 sealing device comprising: a sliding part held by the inner diameter side sleeve or the outer diameter side sleeve and sliding relative to the one sliding part, the shaft sealing device comprising:
The inner diameter side sleeve is partially inserted into the outer diameter side sleeve,
One sleeve is provided with a through-hole that penetrates in the radial direction,
The other sleeve is formed with a recess defining a space with the one sleeve,
The recess is provided with an inclined surface,
A shaft sealing device in which a fixing member that abuts on the inclined surface and is fixed to the through hole is inserted through the through hole. 2. A shaft sealing device according to claim 1, wherein said inclined surface is inclined so as to approach said one sleeve toward the insertion side end of said other sleeve. 3. The shaft sealing device according to claim 1, wherein the through hole is inclined perpendicular to the inclined surface. 3. The shaft sealing device according to claim 1, wherein the through hole is inclined with respect to the erecting direction of the inclined surface. 5. A shaft sealing device according to claim 1, wherein said other sleeve has a stopper portion axially abutting against said abutted portion of said one sleeve. 6. A shaft sealing device according to claim 1, wherein said inclined surface is formed in an annular shape. 7. The shaft according to any one of claims 1 to 6, wherein a female threaded portion is provided on the inner peripheral surface of the through hole, and the fixing member has a male threaded portion that is screwed into the female threaded portion. sealing device. 8. The shaft sealing device according to claim 7, further comprising a retaining screw for retaining said fixing member.

Images