JP2000266189A - Mechanical seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanical seal in which the form of the parts to compose the energizing means and the rotation blocking means of a still sealing ring can be simplified, and the number of the part items of the above means can be reduced. SOLUTION: A recess part 58 is formed on the outer periphery of the end of a still sealing ring 5, a spring receiving body 53 which consists of a ring form plate cutting off a part of the ring form recess 58 is engaged and fixed by utilizing its elasticity, a spring member 6 is loaded between the spring receiving body 53 and an installing part 42 opposing to the spring receiving body 53, an engaging groove 56 extending in the axial line direction is formed at the end of the still sealing ring 5, and a driving pin 55 installed to the installing case 4 is engaged to the engaging groove 56. The outer peripheral surface of the still sealing ring 5 is composed in a taper face whose diameter is contracted gradually from the ring form recess 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary sealing ring held in a mounting case so as to be movable in the axial direction, a rotating sealing ring fixed to a rotating shaft at one end of the stationary sealing ring, and a stationary sealing ring. The present invention relates to a mechanical seal including a spring member for pressing a ring against a rotary sealing ring.

[0002]

2. Description of the Related Art As a conventional mechanical seal, FIG.
As shown in the figure, the mounting case 104 is attached to the shaft sealing casing 111 of the rotating device, the stationary sealing ring 105 is held by the mounting case 104 so as to be movable in the axial direction, and is inserted and fixed to the rotating shaft 112 by the stopper ring 109. Sleeve 107 and a stationary sealing ring 10
5, a rotating seal ring 108 fixed to the mounting case 104, a spring receiving member 153 non-rotatably engaged with the stationary sealing ring 105, and a spring mounted on the mounting case 104 facing the spring receiving member 153. Holder 142
And a seal member 148 that is held on the inner peripheral portion of the mounting case 104 and secondary seals between the mounting case 104 and the rotating shaft 112, and is loaded between the spring receiving body 153 and the spring holding body 142. And the stationary sealing ring 105
And a plurality of coil springs 161... For pressing and urging the rotating seal ring 108, and the spring ring 153 and the spring holding member 142 are interposed to rotate the stationary seal ring 105 relative to the mounting case 104 in the axial direction. A drive pin 155 that allows and blocks movement is provided, and the relative rotation sliding action of the two sealing rings 105 and 108 causes the sealed fluid region A, which is an internal region of the rotary device, and the atmospheric region B, which is an external region, to be rotated. (Hereinafter referred to as "conventional seal") are known.

In the conventional seal, the spring receiving member 153 is fitted to the end of the stationary sealing ring 105, and the relative rotation at the fitting portion is provided on the spring receiving member 153. The pin 153a is fixed to the stationary sealing ring 105.
By engaging with the engagement groove 105a formed in
Has been blocked. A plurality of first recesses 142a are formed at one end of the spring retainer 142 and arranged in a ring at predetermined intervals in the circumferential direction. The other end of the spring holder 142 has a first recess 142a that does not interfere with the first recess 142a. Two recesses 142b are formed. One end of each coil spring 161 is engaged and held in each first recess 142a. Further, the drive pin 155 is screwed and fixed to the spring receiving body 153, and the tip end thereof penetrates through the spring holding body 142 and protrudes into the second recess 142 b. The distal end of the drive pin 155 has a large-diameter retaining portion 155 that is allowed to move in the axial direction within the second concave portion 142b.
a is formed. Therefore, the stationary sealing ring 105
Is axially movable within a range in which the retaining portion 155a of the drive pin 155 can be moved in the second concave portion 142b while being relatively non-rotatably locked to the spring holding member 142 via the spring receiving member 153 and the drive pin 155. Is tolerated. The spring holder 142 is prevented from rotating relative to the mounting case 104 by engaging a pin 142c protruding from the spring holding member 142 with a lid 104a constituting an outer end of the mounting case 104. In addition, the sealing member 148 includes the lid 104a.
Is engaged and held on the inner peripheral portion of the.

[0004]

By the way, the mechanical seal plays an important role (shaft sealing) which influences the function of the rotating device, but does not form a main part of the rotating device. It is required to be as compact as possible in terms of cost and cost. In other words, the structural and economical tolerances of the main components of rotating equipment and the attached mechanical seals are very different.
It is required that the structural and economical burden allowed for accessory parts such as mechanical seals be reduced as much as possible.
On the other hand, the components of the mechanical seal, such as a sealing ring that is hardly allowed to change the shape or change the configuration because it is directly connected to the sealing function, and the shape is changed within a range that does not adversely affect the function of the main component. And ancillary parts that can be freely changed to some extent, including deletion of the number of parts. Therefore, in order to satisfy the above-mentioned demands, it is necessary to make the shape of such attached parts (parts constituting the urging means of the stationary sealing ring and the rotation preventing means, etc.) as simple as possible. It is preferable that

Considering the structure of the conventional seal from this point of view, for example, since the spring receiver 153 is for receiving the coil springs 161..., It has a diameter sufficient to receive the coil springs 161. Any shape can be used, and it is possible to use a ring-shaped plate whose shape is simple and whose production cost is low.
However, the stationary receiving ring 10 is
A screw hole for screwing and fixing the drive pin 155 and the fitting portion to the end of the screw 5 is required. Therefore, the spring receiving body 153 needs to have a size necessary and sufficient to secure the fitting portion and the screw hole portion, and cannot have a simple shape like the above-mentioned annular plate. Also, the manufacturing cost cannot be reduced.

Since the spring holding member 142 is provided to hold the coil springs 161..., The lid 10 forming a part of the mounting case 104 is provided.
4a can be shared, and in such a case, the number of parts can be reduced. However, the spring receiver 14
2 requires a second recess 142b for the retaining portion 155a of the drive pin 155 to move, so that a space for holding the seal member 148 is secured when the cover member 104a is also used. Can not do it. Of course, if the second concave portion 142b is arranged on the outer peripheral side of the holding portion of the seal member 148, the lid 104a can also be used, but in this case, the drive pin 155 is screwed and fixed. For this reason, the diameter of the spring receiving member 153 becomes unnecessarily large, which leads to an increase in the size of the spring receiving member 153 and thus the entire mechanical seal.

As described above, in the conventional seal, although there is a component that can be simplified in shape and the number of components can be reduced, it is necessary to improve the component to satisfy the above-mentioned requirements. It was impossible.

An object of the present invention is to provide a mechanical seal that can satisfy the above-mentioned requirements by simplifying the shape and reducing the number of parts as much as possible for attached parts that are not directly connected to the sealing function. Things.

[0009]

According to the present invention, there is provided a stationary sealing ring held in a mounting case so as to be movable in an axial direction, and a rotating sealing ring fixed to the rotating shaft side opposite to one end of the stationary sealing ring. In order to achieve the above object, in the mechanical seal including a spring member for pressing the stationary sealing ring against the rotating sealing ring, in particular, an annular recess is formed on the outer periphery of the other end of the stationary sealing ring. A spring receiving body made of an annular plate, a part of which is cut off, is engaged and fixed by utilizing the elasticity of the material, and a spring member is loaded between the spring receiving body and a mounting case portion facing the spring receiving body, and statically sealed. It is proposed that an engagement groove extending in the axial direction is formed at the other end of the ring, and a drive pin attached to a mounting case is engaged with the engagement groove. In such a mechanical seal, in order to facilitate engagement of the spring receiver with the annular recess, the outer peripheral surface of the other end of the stationary sealing ring is
It is preferable to form a tapered surface whose diameter gradually decreases from the annular concave portion.

[0010]

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 configured in 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, 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 body 41 and an annular spring holder 42 fitted and fixed to the inner peripheral portion of the front end of the case 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 thereto, and the case main body 41 is fixed 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 an engaging groove 56 formed in the first cylindrical portion 51a of the holder 51 so as to extend in the axial direction from the front end thereof to the rear. By engaging the drive pin 55 implanted in the inner peripheral portion of the case main body 41 with the engagement groove 56, the case body 41 is allowed to move in the axial direction within the range of the engagement groove 56.
Are held so that they cannot rotate relative to each other. 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 49 is
The annular step 49 is set to such an extent that the first cylindrical portion 51a of the holder 51 can be inserted with a slight gap therebetween. In this example, the drive pin 55 and the engagement groove 56 are
As shown in FIG. 2, they are provided at two locations facing each other in the diameter direction.

Further, as shown in FIG. 1, the stationary sealing ring 5 is provided 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.

As shown in FIGS. 1 to 3, the spring receiving body 53 is formed of an annular plate having a part 53a 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. At the rear end of the spring holding body 42, a plurality of recesses 42a are formed in parallel with each other at predetermined intervals in the circumferential direction, and the front end of each coil spring 61 is engaged with each recess 42a. Are held together.

As shown in FIG. 1, the rotary side sealing element 2 is used to fix the sleeve 7 inserted through the rotary shaft 12, the rotary seal ring 8 fixedly held on 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 rotary 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, an O-ring 75 and a drive pin 7 are provided at the rear end 72 of the sleeve 7 as shown in FIG.
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 O-ring 54 is inserted into the case body 41 from behind. Then, the drive pins 55, 55 are engaged with the engagement grooves 56, 56 of the stationary sealing ring 5, and
3 is fixed to the stationary sealing ring 5 by engaging the annular recess 58 of the stationary sealing ring 5. The engagement of the spring receiver 53 with the annular recess 58 is partly 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.
This can be easily performed by the elastic deformation of the spring receiving body 53 itself, which is an annular plate from which.

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 static 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 two 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 engaged with each of the engagement holes 77, the stopper ring 9 can be connected to the sleeve without having to tighten the set screws 91 and 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 direction and the radial direction 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 rotating 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).

The operation of assembling the mechanical seal M into the rotating device is performed by assembling the mechanical seal M in advance 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 in this manner, 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 concave portion of the spring holder 42.

By the way, in the conventional seal, as described at the beginning, the retaining portion 155a of the drive pin 155 protrudes into the second concave portion 142b formed in the spring holder 42. By
A space corresponding to the annular concave portion 47 for holding the seal member 148 on the inner peripheral portion of the spring holder 142 cannot be secured.

However, in the mechanical seal M described above, the spring receiving body 53 is formed of an annular plate with 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. 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 described above is used.
Can be attached and detached to and from a rotating device as a cartridge structure assembled in the same form as the usage mode. Therefore, a shaft sealing portion of a rotating device that is not scheduled to have a mechanical seal (for example, a gland packing is used) Can be mounted on the stuffing box, etc. without changing its structure, and the existing shaft sealing part of the stuffing box, etc. can be easily remodeled with a mechanical seal. it can.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately improved and changed without departing from the basic principle of the present invention. For example, the present invention can be applied not only to the above-described cartridge-type mechanical seal M, but also to a mechanical seal in which each component is individually incorporated into a shaft sealing portion of a rotating device in a predetermined procedure. The mechanical seal to which the present invention is applied is a non-contact type in which the sealing end faces 5a and 8a are kept in a non-contact state by dynamic pressure or static pressure, in addition to an end contact type in which the sealing end faces 5a and 8a are in relative sliding contact. Can also be applied.

[0041]

As will be easily understood from the above description, the mechanical seal of the present invention has as simple as possible the shape of the components constituting the urging means or the rotation preventing means of the stationary sealing ring. In addition, since the number of parts of the means is reduced, the structure can be simplified, the device can be manufactured at low cost, and the assembly is easy, so that the device has extremely high practical value.

[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;

FIG. 5 is a vertical sectional side view showing a conventional seal.

[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, a spring holder (a mounting case portion facing the spring receiver), 44, a front end of the spring holder, 46, a positioning surface, 48, a sealing member, 49, an annular stepped portion, 51, a holder, 51a. 1st cylindrical part (the other end of the stationary sealing ring), 52... The sealing ring body (one end of the stationary sealing ring), 53.
3a (separated portion of spring receiver), 55 drive pin, 56 engagement groove, 58 annular recess, 59 tapered surface, 61 coil spring, 71 front end of sleeve, 72 rear of sleeve End, 73 ... Set hole, 77 ...
Engagement holes, 91, 92: set screw, 93: screw hole.

Claims (2)

[Claims] 1. A stationary sealing ring held in a mounting case so as to be movable in an axial direction, a rotating sealing ring fixed to an end of a stationary sealing ring on a rotating shaft side, and a rotating sealing ring fixed to the stationary sealing ring. And a spring member that presses the spring member toward the other end of the mechanical seal. The spring member is loaded between the spring receiving body and the mounting case portion facing the spring receiving body, and an engaging groove extending in the axial direction is formed at the other end of the stationary sealing ring. A mechanical seal wherein a drive pin mounted on a mounting case is engaged with the engagement groove. 2. The mechanical seal according to claim 1, wherein the outer peripheral surface of the other end of the stationary sealing ring is formed as a tapered surface whose diameter gradually decreases from the annular concave portion.