JP2000266190A - Mechanical seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cartridge form of mechanical seal which can carry out the assembly work to a rotary apparatus, and a maintenance work easily. SOLUTION: A still side seal element 1 and a rotation side seal element 2 are connected integrally by plural setting claws 3. The still side seal element 1 has an installing case 4; a still sealing ring held in the installing case 4; and a circular positioning surface 46 formed in the installing case 4. The rotation side seal element 2 has a sleeve 7 inserted in a rotary shaft 1; a rotary sealing ring installed to the sleeve 7; a stopper ring 9 inserted to the sleeve 7; and the first and the second set screws 91 and 82 screwed in to the stopper ring 9. The setting claws 3 have an axial line direction positioning part 34 injected and engaged to an engaging hole formed to the sleeve 7; and a radial direction positioning part 33 contacted and engaged to the positioning surface 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary sealing element mounted on a shaft sealing casing of a rotating device and a rotating sealing element detachably mounted on a rotating shaft penetrating the shaft sealing casing. The present invention relates to a cartridge-type mechanical seal configured to be integrally connected by a set claw.

[0002]

2. Description of the Related Art Generally, a mechanical seal comprises a stationary sealing element attached to a shaft sealing casing of a rotating device and a rotating sealing element attached to a rotating shaft passing through the shaft sealing casing. Then, the mechanical seal is attached to the shaft sealing portion casing and the rotating shaft by a plurality of components (sealing rings and the like) constituting each sealing element.
Are individually incorporated in a certain procedure.

[0003] Incidentally, the positional relationship between the constituent members constituting both sealing elements is an important factor that determines the function of the mechanical seal, and the incorporation of each constituent member is performed so that the positional relationship is appropriate. There is a need. That is, by appropriately positioning both sealing elements in the radial direction and the axial direction, the parallelism (perpendicularity with respect to the rotation axis) and concentricity of the sealing end faces, which are the opposite end faces of the stationary sealing ring and the rotating sealing ring, are ensured; It is necessary to assemble so that the contact pressure between both sealing end faces is appropriate.

[0004]

However, since these sealing elements are composed of many members, not only unskilled persons but also skilled persons can rotate the sealing elements while maintaining the above-mentioned proper positional relationship. The work of assembling the device is extremely difficult, and it is not rare that a predetermined sealing function is not exhibited due to improper incorporation. Similarly, maintenance work that requires removal and re-installation from the rotating device is also cumbersome and difficult.

The present invention has been made in view of such a point, and can be attached to and detached from a rotating device in a state in which both sealing elements are assembled in the same form as a used condition. An object of the present invention is to provide a cartridge-type mechanical seal capable of easily performing an assembling operation and a maintenance operation.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is particularly directed to inserting and removing a stationary sealing element mounted on a shaft sealing casing of a rotating device and a rotating shaft passing through the shaft sealing casing. The present invention proposes a cartridge-type mechanical seal configured to integrally connect a freely mounted rotating side sealing element with a plurality of set claws.

That is, the stationary sealing element includes a cylindrical mounting case having one end mounted on the shaft sealing casing;
The stationary sealing ring held in the mounting case, and a circular positioning surface formed concentrically with the stationary sealing ring at the other end of the mounting case. The rotating-side sealing element is a thin-walled cylinder that is removably fitted to the rotating shaft, and penetrates the stationary-side sealing element concentrically with one end protruding from the other end of the mounting case. A sleeve, a rotating seal ring attached to the other end of the sleeve in a state facing the stationary seal ring, a stopper ring inserted through one end of the sleeve, and screwed to the stopper ring to the outer peripheral surface of the sleeve And a second set screw which is screwed to the stopper ring and which can be tightened to the outer peripheral surface of the rotary shaft portion through which the sleeve is inserted. Each set claw includes a mounting portion that is detachable from the stopper ring, an axial positioning portion that protrudes into and engages with an engagement hole formed in the sleeve, and a radial positioning portion that contacts and engages with the positioning surface. When the mechanical seal is attached to or detached from a rotating device, both sealing elements are used (parallelism and concentricity of the sealing end faces as opposed end faces of the sealing rings are ensured, and the contact pressure between the sealing end faces is secured). Is appropriate)
This is for the purpose of being integrally connected to the same form. That is, with the plurality of set claws, the two sealing elements can be integrally connected in a state where the positional relationship in the axial direction and the radial direction of the two sealing elements is set to the same form as the use form of the mechanical seal.

In such a mechanical seal, one of the sealing elements includes a spring member for pressing the two sealing rings into contact with each other. In this state, the spring is biased by the urging force of the spring member between the opposing surfaces of the mounting case and the stopper ring, and the engagement hole of the sleeve engages with the axial positioning portion in the pressed state. It is preferable that it is formed in the position where it does.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be specifically described with reference to FIGS.

The mechanical seal M shown in FIGS.
It is interposed between a shaft sealing casing 11 of a rotating device and a rotating shaft 12 penetrating therethrough and protruding outside the device, and a sealed fluid region A as an internal region of the rotating device and an atmospheric region B as an external region. For sealing the stationary sealing element 1, the rotating sealing element 2, and both sealing elements 1 and 2 to and from the shaft sealing casing 11 and the rotating shaft 12. It is of a cartridge type comprising set claws 3. In the following description, front and rear mean left and right in FIG.

As shown in FIGS. 1 and 3, the stationary sealing element 1 includes a cylindrical mounting case 4 mounted on a shaft sealing casing 11, a stationary sealing ring 5 provided inside the mounting case 4, and a stationary sealing ring 5. A spring receiver 53 attached to the stationary sealing ring 5, a spring member 6 disposed between the mounting case 4 and the stationary sealing ring 5, and a front end of the mounting case 4 (a front end of a spring holder 42 described later) Part) 44 is provided with a circular sealing surface 46 formed concentrically with the stationary sealing ring 5.

As shown in FIGS. 1 and 3, the mounting case 4 has a cylindrical case main body 41 and an annular spring holder 42 fitted and fixed to the inner peripheral portion of the front end of the case main body 41.
Consists of The case main body 41 is attached to the front end of the shaft sealing casing 11 with bolts and nuts 43 (only one set is shown) in a state where the rotary shaft 12 passes through the case main body concentrically. The spring holder 42 has a front end 44
Is protruded forward from the front end face of the case body 41, and the rotating shaft 12 is penetrated concentrically.
5 (only one is shown) is attached to the front end of the case main body 41. The front end face of the spring holder 42
The case body 41 is formed in an annular plane orthogonal to the axis of the case body 41. The outer peripheral surface of the front end of the mounting case 4, that is, the outer peripheral surface of the front end 44 of the spring holder 42 is formed as a circular positioning surface 46 concentric with the case body 41 and the stationary sealing ring 5 described later. Also, the spring holder 42
As shown in FIG. 3, an annular sealing member 48 is loaded in an annular concave portion 47 formed in the inner peripheral portion of the inner peripheral portion, and a device is devised so as to secondary seal between the spring holder 42 and the rotating shaft 12. ing. In this example, as the seal member 48, a plurality of PTFE spiral rings (spiral-shaped strips) 48a are used, and these spiral rings 48a are loaded in the annular concave portion 47 in a state of being overlapped in the axial direction. Let me. The case body 41 is provided with a flushing passage 41a and a quenching passage 41b, as shown in FIG.

As shown in FIG. 1, the stationary sealing ring 5 comprises a cylindrical holder 51 and an annular sealing ring main body 52 fixed to the cylindrical holding body 51. The stationary sealing ring 5 is connected to the case main body 41 via an O-ring 54 and a drive pin 55. The inner peripheral portion is held movably in the axial direction (front-back direction) and non-rotatable.

As shown in FIG. 1, the holding body 51 comprises a thin first cylindrical portion 51a and a thick second cylindrical portion 51b integrally formed at the rear end thereof. As shown in FIG. 3, a cutout groove 56 having a front opening shape extending in the axial direction is formed in the first cylindrical portion 51a. The sealing ring main body 52 includes a second cylindrical portion 51b.
Are fitted and fixed concentrically.

As shown in FIGS. 1 and 3, the stationary sealing ring 5 has a cutout groove 5 formed in the first cylindrical portion 51a of the holder 51.
Drive pins 5 implanted in the inner peripheral portion of the case body 41
By engaging the engagement member 5, the case body 41 is held by the case main body 41 so as to be relatively non-rotatable in a state where the movement in the axial direction within the range of the notch groove 56 is allowed. The drive pin 55 is implanted in a small-diameter annular step portion 49 formed on the inner peripheral portion of the case main body 41. The inner diameter of the annular step portion 49 is set so that the first cylindrical portion 51a of the holder 51 can be inserted through the annular step portion 49 with a slight gap therebetween. In this example, the drive pin 55 and the notch groove 56 are provided at two locations that are diametrically opposed as shown in FIG.

Further, as shown in FIG. 1, the stationary sealing ring 5 is located between the outer peripheral portion of the first cylindrical portion 51a of the holder 51 and the inner peripheral portion of the case body 41 at the rear of the annular step portion 49. It is concentrically sealed to the case body 41 via an interposed O-ring 54 and is movably held in the axial direction. The stationary sealing ring 5 is concentric with a positioning surface 46 formed on the case body 41. A backup ring 57 made of a low friction material such as PTFE is interposed between the annular step 49 and the O-ring 54.

As shown in FIGS. 1 to 3, the spring receiving body 53 is formed of an annular plate having a part 53 a separated therefrom.
It is engaged and fixed to an annular recess 58 formed on the outer periphery of the front end of the cylindrical portion 51a. The spring receiving body 53 is capable of engaging and disengaging from the annular recess 58 by utilizing the elasticity of the material by partially separating the spring receiving body 53a. Is appropriately selected on the condition that elastic deformation that enables engagement and disengagement and strength that can receive spring pressure by the spring member 6 can be ensured. In this example, the spring receiver 53 is SU
It is obtained by cutting off a part 53a of a thin annular plate made of S316. As shown in FIG. 3, the outer peripheral surface of the front end of the first cylindrical portion 51a of the holding body 51 has an annular recess 5 for facilitating engagement and disengagement of the spring receiving body 53 with the annular recess 58.
The tapered surface 59 gradually decreases in diameter from 8 to the front. The rearward movement of the spring receiver 53 by a certain amount or more is prevented by abutment of the annular step portion 49 with the front end portion.
It is designed so that it does not come out of the mounting case 4 rearward even when pressed by the key.

As shown in FIGS. 1 and 3, the spring member 6 is composed of a plurality of coil springs 61 interposed between a spring holder 42 and a spring receiver 53. Is pushed backward. The coil springs 61 are arranged at equal intervals in the circumferential direction, as shown in FIG. The front end of each coil spring 61 is engaged and held in a recess 42 a formed in the rear end of the spring holder 42.

As shown in FIG. 1, the rotary-side sealing element 2 is used for fixing the sleeve 7 inserted through the rotary shaft 12, the rotary seal ring 8 fixedly held to the sleeve 7, and the sleeve 7 to the rotary shaft 12. , And a plurality of set screws 91... 92.

As shown in FIG. 1, the sleeve 7 is inserted through the rotating shaft 12 with its front and rear ends 71, 72 protruding from the mounting case 4. The sleeve 7 has a thin cylindrical shape except for a rear end portion 72, and a plurality of (two in this example) set holes 73 are formed in the front end portion 71. Also, on the inner peripheral portion of the rear end portion 72 of the sleeve 7,
An O-ring 74 for secondary sealing with the rotating shaft 12 is held.

As shown in FIG. 1, the rotary seal ring 8 includes an O-ring 75 and a drive pin 7 at the rear end 72 of the sleeve 7.
6 are fitted and fixed concentrically. Rotary seal ring 8
, The stationary sealing ring 5, that is, the sealing ring main body 52 is pressed and contacted by the coil springs 61. Stationary sealing ring 5
And the rotary sealing ring 8 are formed at the sealing end faces 5a and 8a which form an annular smooth surface orthogonal to the axis.

As shown in FIGS. 1 and 3, the stopper ring 9 is an annular body fitted to the front end 71 of the sleeve 7 concentrically therewith. Proper fitting of the stopper ring 9 to the sleeve 7 is ensured by the annular step 94 formed on the inner peripheral portion of the front end of the stopper ring 9 abutting against the front end surface of the sleeve 7. The rear end face of the stopper ring 9 is formed in an annular plane perpendicular to the axis of the sleeve 7 in the proper fitting state. The stopper ring 9 is provided with a plurality (four in this example) of screw holes 93 penetrating in the radial direction at appropriate intervals in the circumferential direction. Two of these screw holes 93 are aligned with the set holes 73 formed in the sleeve 4 in the above-described proper fitting state. A first set screw 91 is screwed into each screw hole 93 that does not match the set hole 73, and each first set screw 91 is tightened to the outer peripheral surface of the sleeve 7 as shown in FIG. By
The stopper ring 9 is fixed to the sleeve 7. on the other hand,
A second set screw 92 is screwed into each screw hole 93 corresponding to the set hole 73, and each second set screw 92 is tightened to the outer peripheral surface of the rotary shaft 12 through the set hole 73 as shown in FIG. As a result, the stopper ring 9 is fixed to the rotating shaft 12. Therefore, the sleeve 7 can be fixed to the rotating shaft 12 by tightening the first and second set screws 91 and 92 provided on the stopper ring 9 (the state shown in FIG. 1), and the first and second setscrews are respectively provided. By loosening the set screws 91 and 92, the sleeve 7 can be inserted into and removed from the rotary shaft 12 (the state shown in FIGS. 3 and 4). By the way, the total length of the sleeve 7 is set in a state where the positional relationship between the sealing elements 1 and 2 in the axial direction is appropriate, that is, in a state where the contact pressure of the spring members 6 of the sealing rings 4 and 5 is appropriate. The rear end face of the stopper ring 9 attached to the front end face of the spring holder 42 and the front end face of the spring holder 42 are set so as to face each other at a predetermined interval (hereinafter, referred to as “appropriate interval”) H in the axial direction.

As shown in FIGS. 3 and 4, each set claw 3 has an arcuate plate-shaped mounting portion 32 mounted on the outer peripheral portion of the stopper ring 9 with a screw 31 and a positioning surface 46 formed on the mounting case 4. A circular plate-shaped radial positioning portion 33 to be in contact with and engaged with the front end portion 44 of the spring holder 42 and the fan plate which is fitted into the engagement hole 77 formed in the sleeve 7 by being fitted between the stopper ring 9. And an axial-direction positioning portion 34. Although the number of the set claws 3 is arbitrary, in this example, the pair of set claws 3, 3 are connected as shown in FIG.
The stopper ring 9 is mounted at a position facing the radial direction. The inner surface 33a of the radial positioning portion 33 that is in contact with the positioning surface 46 is an arc surface having the same diameter as the positioning surface 46, and is concentric with the stopper ring 9 when the mounting portion 32 is mounted on the stopper ring 9. Are formed on the arc surface. Therefore, when the mounting portion 32 is attached to the stopper ring 9 and the inner side surface 33a of the radial positioning portion 33 is brought into close contact with the positioning surface 46, the stopper ring 9 and the spring holding member 42 are misaligned in the radial direction. As a result, the stationary sealing element 1, the stopper ring 9, and the sleeve 7 held concentrically with the stationary holding element 1 composed of the spring holder 42 and the case body 41 concentric with the spring holder 42, etc. The radial positional relationship with the rotation-side sealing element 2 constituted by the above can be maintained properly (concentrically). The axial positioning portion 34 is orthogonal to the mounting portion 32 so that the mounting portion 32 is in contact with the rear end surface of the stopper ring 9 when the mounting portion 32 is mounted on the stopper ring 9. The dimension is set to match the appropriate interval H. The engagement hole 77
Is formed on the stopper ring 9 when the axial distance between the stopper ring 9 and the spring holding body 42 in the above-mentioned proper fitting state with respect to the sleeve 7 is the proper distance H. It is set so that the tip of the axial positioning portion 34 of the attached set claw 3 can rush into engagement. Accordingly, even when the set screws 91 and 92 are loosened, that is, even when the stopper ring 9 is not fixed to the sleeve 7 and the sleeve 7 is not fixed to the rotating shaft 12, the mounting portion 32 is attached to the stopper ring 9. When the axial direction positioning portion 34 is engaged with the engaging hole 77 while being attached, the sleeve 7 is moved by the urging force of the coil springs 61.
, The axial positioning portion 34 is moved forward by the stopper ring 9 and the spring holder 42.
And the stopper ring 9 is prevented from being detached from the sleeve 7 by the engagement of the axial positioning portion 34 with the engagement hole 77, and is held in a proper fitting state. With the proper distance H maintained, the two sealing elements 1 and 2 are connected so that they cannot be relatively displaced in the axial direction. In addition,
In order to connect and position the two sealing elements 1 and 2, at least one pair of set claws 3 is required.

The mechanical seal M configured as described above is assembled into a cartridge structure having the same form as the use form that exhibits a predetermined seal function as follows.

First, the stationary sealing ring 5 fitted with the backup ring 57 and the O-ring 54 is inserted into the case body 41 from the rear thereof. Then, the drive pins 55, 55 are engaged with the cutout grooves 56, 56 of the stationary sealing ring 5, and the spring receiver 53 is engaged with the annular recess 58 of the stationary sealing ring 5 to be fixed to the stationary sealing ring 5. . The engagement of the spring receiver 53 with the annular recess 58 is due to the fact that the outer peripheral surface of the front end of the stationary sealing ring 5 is formed on the tapered surface 59, and the spring 53 is an annular plate partially cut off. This can be easily performed by the elastic deformation of the receiving body 53 itself.

Next, the sleeve 7 to which the rotary seal ring 8 is fixed is inserted through the stationary seal ring 5 from behind, and the rotary seal ring 8 is opposed to the stationary seal ring 5. And the case body 4
The coil springs 61... And the spring holder 42 holding the seal member 48 are inserted into the front end portion of the sleeve 7 protruding forward from 1, and the stopper ring 9 is fitted.

After that, the spring holding member 42 is
5, the mounting case 4 is assembled by assembling the mounting case 4 and the mounting portion 32 of each set claw 3 is brought into contact with the radial positioning portion 33 in contact with the positioning surface 46 of the spring holder 42, and the axial positioning portion By attaching the stopper 34 to the stopper ring 9 with the screw 31 while pressing the stopper 34 between the stopper ring 9 and the spring holder 42 and pressing the stopper 34 into the engagement hole 77 of the sleeve 7, both sealing elements are A mechanical seal M having a cartridge structure positioned so that the positional relationship between the axis 1 and the axis 2 in the radial direction is the same as that in the usage mode is assembled (see FIGS. 3 and 4).

That is, since the axial positioning portions 34 of the set claws 77 attached to the stopper ring 9 are engaged with the engagement holes 77 of the sleeve 7, the set screws 91 and 92 of the stopper ring 9 are tightened. If not, the stopper ring 9 is
.. Without being pulled out of the sleeve 7 by the pressing force of... (The second set screws 92, 92 coincide with the set holes 73, 73 in the axial direction of the sleeve 7). Will be held. The distance between the stopper ring 9 and the spring holder 42 in the axial direction is maintained at a dimension corresponding to the plate thickness h by the interposition of the axial positioning portion 34 of each set claw 3. Is held. That is, by the pressing action of the coil springs 61 and the engaging action of the set claws 3 in the engaging holes 77 of the axial positioning portions 34, the stationary sealing element 1 and the rotating sealing element 2 are separated from each other by the coil springs. 61 are connected in a state where the contact pressures of the two sealing rings 5 and 8 are proper, that is, in a state where the relative positions of the two sealing elements 1 and 2 in the axial direction are proper. .

When the mechanical seal M is detached, it is necessary to fix the stopper ring 9 to the sleeve 7 in order to connect the sealing elements 1 and 2 to each other. Is fixed by a set screw, especially the first set screw 9.
1, 91 can also be performed by tightening. However, if the first set screws 91, 91 are tightened in a state where the sleeve 7 is not fitted to the rotating shaft 12, the thin-walled sleeve 9 may be deformed. On the other hand, if the sleeve 7 is made thick, there is no such a possibility. However, the diameter of the stationary sealing ring 5 through which the sleeve 7 penetrates and the diameter of the rotary sealing ring 8 fitted and fixed to the sleeve 7 are larger than necessary. Accordingly, the case body 41 and the like are inevitably increased in size, and the mechanical seal M is unnecessarily increased in size. Moreover, since the sleeve 7 is long,
If this is made thicker, the entirety of the mechanical seal M will be unnecessarily heavy, coupled with the increase in the size of the sealing rings 5, 8 and the like.

However, as described above, if the axial positioning portion 34 of each set claw 3 is made to engage with each engagement hole 77, the stopper ring 9 can be connected to the sleeve without having to tighten each set screw 91, 92. 7, the sleeve 7 can be made thin without causing the above-mentioned problems, and the mechanical seal M can be reduced in size and weight as much as possible.

The positional relationship between the stopper ring 9 and the spring holder 42 in the radial direction is determined by the radial positioning portions 33 of the set claws 3, 3 attached to the stopper ring 9 in the radial direction. Since the spring holder 42 is in contact with the positioning surface 46 of the spring holder 42, the spring holder 42 is concentric. Therefore, the two sealing elements 1 and 2 are integrally connected in a state where the relative position in the radial direction is proper, and as a result, the stationary seal held by the mounting case 4 concentrically with the positioning surface 46. Ring 5 and sleeve 7
The radial position with respect to the rotary seal ring 8 which is fitted and fixed concentrically to the seal ring 5 is also held concentrically, and the parallelism and concentricity of the seal end faces 5a, 8a which are the opposite end faces of the seal rings 5, 8 Will be secured.

As described above, the mechanical seal M in which the two sealing elements 1 and 2 are integrally connected while being properly positioned in the axial and radial directions by the pair of set claws 3 and 3 is as follows.
It can be incorporated in the rotating device as it is, and then, by removing both set claws 3, 3, a good sealing function can be exhibited.

That is, the sleeve 7 is inserted through the rotary shaft 12, the mounting case 4 is mounted on the shaft sealing casing 11 with the bolts and nuts 43, and the stationary sealing element 2 is mounted on the shaft sealing casing 11. Then, tighten each first set screw 91 to the sleeve 7,
The stopper ring 9 is fixed to the sleeve 7, and each second set screw 92 is tightened to the rotary shaft 12 through the set hole 73, and the rotary side sealing element 2 is attached to the rotary shaft 12. Thereafter, by removing each set claw 3 from the stopper ring 9, the incorporation of the mechanical seal M into the rotating device is completed (see FIG. 1).

When the mechanical seal M is assembled into the rotating device, the mechanical seal M is previously assembled in the same form as the use form as described above. Compared with the case where each of them is incorporated separately, it is extremely easy, and even an unskilled person can perform the assembly properly without causing a defective assembly.

Therefore, according to the mechanical seal M incorporated as described above, the stationary seal ring 5, that is, the seal ring main body 52 and the rotary seal ring 8 are rotated with the rotation of the rotary shaft 12.
The sealed end faces 5a and 8a, which are opposite end faces to each other, rotate relative to each other in a parallel and concentric state where they are brought into contact with an appropriate pressure. The region B and the region B can be sealed well. In addition, such a sealing function is performed between the inner peripheral side regions of the sealing end faces 5 a and 8 a in the mounting case 4 and the mounting case 4.
The effect is achieved more favorably because the communication portion with the outside atmosphere region B is secondarily sealed by the seal member 48 loaded in the inner peripheral recess 47 of the spring holder 42.

By the way, in a general mechanical seal,
A drive pin 5 is attached to a member corresponding to the spring receiver 53.
5 is protruded rearward, this pin member is inserted through a through hole formed in the member corresponding to the spring holder 42, and the end of the pin member has a diameter larger than that of the through hole. A retaining portion is provided to prevent the relative rotation of the stationary sealing ring 5. However, in such a configuration, in order to avoid an increase in the size of the mechanical seal, a spring member for pressing the stationary sealing ring and a pin member for preventing relative rotation of the stationary sealing ring have a diameter from the rotation shaft. It cannot be placed at a position more than a certain distance in the direction. For this reason, a space corresponding to the annular concave portion 47 cannot be secured in the inner peripheral portion of the member corresponding to the spring holder 42, and a secondary sealing means such as the seal member 48 cannot be provided.

However, in the mechanical seal M described above, the spring receiving body 53 is formed of an annular plate having a part 53a cut off, and the drive pin 55 is connected to the case body 4
1 and is engaged with the outer peripheral portion of the stationary sealing ring 5, so that the mechanical seal M is not enlarged unnecessarily, and a space for providing the sealing member 48 (annular concave portion 47). Can be secured, and the sealing member 4
By the secondary sealing operation of the mechanical seal 8, the sealing function of the mechanical seal M can be further improved as described above. In addition, the spring receiving member 53 is formed of a thin annular plate and is engaged with the outer peripheral portion of the stationary sealing ring 5, so that the mechanical seal M can be downsized and the structure can be simplified by reducing the number of parts. And the assembly is easy.

The removal of the mechanical seal M from the rotating device can be performed in the reverse order of the above-described installation into the rotating device, and can be easily performed similarly to the installation. That is, by attaching the set claws 3 and 3 to the stopper ring 9 in the above-described state, loosening the set screws 91 and 92, and removing the mounting case 4 from the shaft seal casing 11, the mechanical seal is provided. M can be removed from the rotating device in the assembled state. In this way, by attaching and detaching the mechanical seal M to the rotating device in the assembled state in the same form as the usage form, maintenance work including assembly and disassembly of the mechanical seal M can be performed very easily.

Further, the mechanical seal M according to the present invention
As described above, since the cartridge can be attached to and detached from the rotating device as a cartridge structure assembled in the same form as the usage mode, the shaft seal portion (for example, the ground) Stuffing box configured to use packing)
In addition, it can be mounted as it is without changing its structure, and an existing shaft sealing portion such as a stuffing box can be easily modified to a mechanical seal.

[0040]

As will be easily understood from the above description, the mechanical seal of the present invention is an integrated structure in which the stationary sealing element and the rotating sealing element have the same form as the use form via the set claw. (Cartridge structure), and can be attached to and detached from rotating equipment in such an assembled state, so that it can be installed, removed, and maintained on rotating equipment properly, regardless of the skill level of the workers. And it can be easily performed. In addition, since the sleeve can be made as thin as possible, the diameter of the stationary sealing ring through which the sleeve can be made as small as possible can be achieved. For example, the size and weight of the sealing element components and the mechanical seal can be reduced. be able to. Further, since the mechanical seal of the present invention can be attached to and detached from a rotating device in a state where it is assembled in the same form as the usage mode, a shaft sealing portion (for example, , A stuffing box configured to use gland packing, etc.) without changing the structure of the stuffing box. It is versatile and practical that can be easily handled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an example of a mechanical seal according to the present invention and showing a usage form in which a seal function is exhibited.

FIG. 2 is a vertical sectional front view taken along the line II-II of FIG.

3 is a vertical sectional side view of a main part showing an assembled state of the mechanical seal (a cross section is along a line III-III in FIG. 4).

FIG. 4 is a longitudinal rear view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

M: mechanical seal, 1: stationary sealing element, 2: rotating sealing element, 3: set claw, 4: mounting case, 5: stationary sealing ring, 5a, 8a: sealed end face, 6: spring member,
7 ... Sleeve, 8 ... Rotating seal ring, 9 ... Stopper ring, 11 ... Shaft sealing part casing, 12 ... Rotating shaft, 32 ... Mounting part, 33 ... Radial positioning part, 34 ... Axial direction positioning part, 41 ... Case body , 42 ... spring holder, 4
4 ... front end of spring holder, 46 ... positioning surface, 5
DESCRIPTION OF SYMBOLS 1 ... Holder, 52 ... Seal ring main body, 53 ... Spring receiving body, 55 ... Drive pin, 61 ... Coil spring, 7
1. Front end of sleeve 72 Back end of sleeve 73
... set holes, 77 ... engagement holes, 91 ... first set screws, 92 ... second set screws, 93 ... screw holes.

Claims (2)

[Claims] 1. A stationary sealing element attached to a shaft sealing casing of a rotating device and a rotating sealing element detachably attached to a rotating shaft passing through the shaft sealing casing.
A cartridge-type mechanical seal configured to be integrally connected by a plurality of set claws, wherein a stationary-side sealing element is mounted on a shaft-sealing portion casing, and a stationary mounting portion is held in the mounting case. A thin-walled cylinder having a sealing ring and a circular positioning surface formed concentrically with the stationary sealing ring on the mounting case, wherein the rotating-side sealing element is removably inserted into the rotating shaft. A sleeve that concentrically penetrates the stationary sealing element with one end protruding from the mounting case, and a rotary sealing ring attached to the other end of the sleeve in a state facing the stationary sealing ring. A stopper ring inserted into one end of the sleeve, a first set screw screwed to the stopper ring and capable of being tightened to the outer peripheral surface of the sleeve, and a stopper ring screwed to the stopper ring. A second set screw that can be tightened to the outer peripheral surface of the rotary shaft portion through which the sleeve is inserted. Each set claw is provided with a mounting portion that is detachable from the stopper ring, and an engagement formed on the sleeve. A mechanical seal, comprising: an axial positioning portion that protrudes into and engages with a hole; and a radial positioning portion that contacts and engages a positioning surface. 2. One of the sealing elements includes a spring member that presses both sealing rings in contact with each other, and the axial positioning portion of each set claw is arranged so that the two sealing rings are properly pressed and contacted. The spring is biased by the urging force of the spring member between the opposing surfaces of the mounting case and the stopper ring, and the engagement hole of the sleeve is formed at a position where the axial positioning portion in the pressure state is engaged. The mechanical seal according to claim 1, wherein: