JPS59159466A - Static type double mechanical seal - Google Patents

Abstract

PURPOSE:To obtain a static type double mechanical seal for which assembly work is made easy by installing the first retainer in demountable ways at the inlet part of a seal housing and installing the second retainer which can be drawn-out outside the seal housing, at the innermost part. CONSTITUTION:The first static sealing ring 19 is held in slidable ways in the direction of axis line in the first retainer 15, and is pressed and urged towards a rotary sealing ring 11 by a spring fitted. The outer peripheral part 16a of the second retainer 16 is inserted into an annular holding part 5a formed on the inner peripheral part at the lower edge of a seal case 5, and the lower edge part 16b is attached onto the upper wall 3 of a stirrer body, and engaged and held so as to not to be revolved relatively at the innermost part of a seal housing 2 and shifted only in the upward direction for permitting a sleeve 9 to be pulled out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stationary double mechanical seal that is suitably used in equipment such as agitators, compressors, prosaws, and turbines.

This type of stationary double mechanical seal is mainly installed in equipment that handles gas, and has a rotating sealing ring provided on the rotating shaft side and a first and second stationary sealing ring provided on the seal housing side on both sides of the rotating sealing ring. The two sealing end surfaces, which are relatively rotationally sliding contact surfaces with the sealing ring, are configured to cause the sealing fluid to sol.

However, the conventional type had a structure in which the mechanical seal could not be installed or removed from the seal housing unless the mechanical seal and seal housing were disassembled, so the structure had a particularly large number of parts. The installation and removal of the complicated stationary double mechanical seal also caused the following problems.

In other words, due to the large number of parts, installation and removal work is extremely troublesome, and this cannot be done efficiently.
Also, when using equipment or large objects. It takes a lot of effort to disassemble and assemble the seal housing including the cold moon liquid piping, and the workers are forced to do so.

Furthermore, since the structure is complex, depending on the level of skill of the operator, there is a risk that the mechanical seal may be assembled incorrectly, a large error may occur in the assembly accuracy, or the assembly accuracy may vary depending on the operator. This is a problem that is directly connected to the quality of the sealing function of the mechanical seal, and should never occur.In view of this, the present invention provides a mechanical seal assembly for each component. We propose that the mechanical seal be made into a unit so that it can be installed and removed from the assembled seal housing without having to be disassembled. It is designed to make it easier and easier to carry out.

Our stationary double mechanical seal, which solved this problem, has a
A sleeve having a rotary seal mold fixed to the substantially central portion thereof is fitted and fixed so as to be removable outside the seal housing, and a first retainer is removably housed in the inlet portion of the seal housing.
A second retainer, which can be pulled out from the seal housing, is engaged with and held in the inner part of the seal housing so as to be movable only in the direction in which the sleeve is pulled out. 2. The static sealing ring is biased and held against the rotating sealing ring, and the sleeve and the first
A connecting means is interposed between the sleeve and the second retainer to enable the two to be connected to each other so as to allow relative movement in the direction of the piercing wire force, and between the sleeve and the second retainer, the rotation ratio of the second retainer with respect to the sleeve is sealed. A moving positive means is provided to prevent the relative movement of the rings in the direction of separation at a predetermined position.

Next, one embodiment will be explained in detail with reference to FIGS. 1 to 4.

This embodiment is an example in which the invention is applied to a weighing type double mechanical seal installed in a large agitator for stirring gas.

FIG. 4 shows the stationary double mechanical seal 1 installed in the pool housing 2 provided on the stirrer.
A cylindrical seal case 5 concentric with the rotating shaft 4, which is an agitating blade shaft, which penetrates the upper wall 3 and extends in the vertical direction, is fitted with an appropriate number of implanted bolts 6, 6... and nuts 7, 7... (only one of each is shown).

The rotary shaft 4 portion located inside the seal housing 2 has a sleeve 9 with a ring 8 on its inner layer, or a sleeve 9 with its upper end in contact with the stepped portion 4a of the rotary side 4, and rotates its upper end. axis 4
The sleeve 9 and the nut part 10 are screwed upward and removed from the rotating shaft 4 by tightening through the nut part 10 screwed onto the sleeve 9 and the nut part 10. The sleeve 9 is designed to be able to be pulled out of the seal housing 2, i.e., upwardly.The sleeve 9 has a rotary seal ring 11 located approximately in the center thereof, and a rotary seal ring 11 that is connected to the O-linog 12, the key 13, and the screw press part. First and second retainers 15 and 16 are loosely fitted to the upper and lower sides of the rotary sealing ring 11, respectively.

The first retainer 15 has an appropriate number of accommodation holes 15b, 15b... (only one shown) bored in its upper end flange 15a, and is inserted into each implant port 17 implanted in the upper end of the seal case 5. In addition, by tightening each nut 18 screwed onto each bolt 17, the first retainer 15 is removably housed in the artificial part of the sole housing 2, and a first static sealing ring is attached to the first retainer 15. 19 is held slidably in the axial force direction via an appropriate number of anti-rotation pins 20, 20, . . . (only one is shown) and an O-ring 21. An appropriate number of subrings (not shown) are interposed between the first ridder 15 and the first stationary sealing ring 19,
The first stationary sealing ring 19 is pressed against the rotating sealing ring 11. An O-ring 23 is provided at the outer part of the first retainer 15 that contacts the inner peripheral part of the seal case 5. It is arranged.

The second retainer 16 includes an outer portion 16 provided with an O-ring 25.
a into the ring holding part 5a formed in the solid part at the lower end of the seal case 5, and bring the lower end part 16b into contact with the earthen wall of the stirrer main body, and then turn the lower end part 15b toward one side. A suitable number (four in this embodiment) of protruding pins 24, 24, etc. with tapered ends are inserted into the recessed holes 5a, 3a, etc. formed in the upper wall 3. As a result, the sleeve 9 is engaged with and held in the inner deep part of the seal housing 2 so as to be relatively unrotatable and movable only in the upward direction in which the sleeve 9 is removed. The lower end edge of the outer circumferential portion 15a of the second redener 16 and the upper end edge of the holding portion 5a of the sole case 5 are both tapered.

Similar to the first stationary sealing ring 19, a second stationary sealing ring 26 is attached to the second redener 16, and a suitable number of anti-rotation bottles (not shown) and an O-lymph 27 are inserted in the cylinder in the axial direction. It is movably held and biased so as to press against the rotary sealing ring 11 via an appropriate number of springs 23, 28, . . . (only the minus signs are shown). The spring 28 biases the second stationary sealing ring 36 against the second retainer 16 to suppress the rotation sound seal 11, and also urges the second stationary sealing ring 36 against the upper wall 3 against the second stationary sealing ring 26. The second retainer 16 is biased so as to be suppressed, and by the latter biasing action, the second retainer 16 is held in conjunction with the upper wall 3 so that it does not separate from the upper wall 3 to one side.

Furthermore, the space between the sleeve 9 and the first redener 15 is 9
, 15 are interposed between the sleeve 9 and the second retainer 16.
A movement preventing stage 20 is interposed to prevent relative movement of the retainer 16 in a direction away from the rotary sealing ring 11 at a predetermined position.In this embodiment, both means 29,
30 are configured as follows.

That is, as shown in FIGS. 1 and 3, the connecting means 29 includes a pair of arc-shaped connecting plates 31, 31, which are attached to and detached from the upper end of the first redener 15 via bolts 32, 32, etc. In addition, a pair of arcuate grooves 9a, 9a are formed at the outer circumferential portion of the sleeve 9 at the tenth end, in which the inner peripheral edge 31a of each of the connecting plates 31 can be engaged. Due to the engagement between the inner edge 31a and the groove 9a, the sleeve 9 and the first retainer 15 are moved relative to each other in the axial force direction while maintaining the normal assembled positional relationship (the positional relationship shown in FIG. 4). They are configured so that they can be connected in a non-rotatable manner. In addition, both the above-mentioned 9 and 15 by this connection means 29
This connection is only necessary when the mechanical seal 1 is put in and removed, and when the mechanical seal 1 is operated, each connection plate 31 is removed from the first retainer 15 and the groove 9a, and the sleeve 9 is connected. In other words, it is of course necessary to prevent the rotation of the rotating shaft 4.Moreover, as shown in FIGS. A ring-shaped locking part 9b that can lock the lower end part 16b of the second sleeve 16 is formed at a position spaced a predetermined distance l downward from the lower end part 16b, and the sleeve is removed from the state shown in FIG. 9
When the second retainer 16 is moved upward, the second retainer 16 is configured to be prevented from moving downward in a direction away from the rotary sealing ring 11 due to the bias of the Ssollinge 28 at a predetermined armpit l. . Further, a key 33 is fixed to the outer portion of one end of the sleeve 9, and an annular cut portion 1 is provided in the inner cylindrical portion of the lower end of the second retainer 16 to avoid interference of the key 33.
6c, and a key groove 16d in which the key 53 can be engaged when the locking part 9b of the sleeve 9 and the lower barb part 16b of the second retainer 16 are abutted, When the sleeve 9 is moved upward by a predetermined amount l from the state shown in FIG. 1, the engagement between the key 33 and the keyway 16d makes it possible to hold the two 9 and 16 so that they cannot rotate relative to each other.

Note that each hole 5b of the flange portion 15a of the first retainer 15 is connected to each corresponding stud bolt 1 of the seal case 5.
When the inner circumferential edge 31a of each connecting plate 31 inserted into the sleeve 7 and accommodated in the first conductor 15 is engaged with each groove 9a of the corresponding sleeve 9, the key 33 of the sleeve 9 and the second Each component is positioned so that the keyway 16d of the retainer 16, each detent pin 24 of the second retainer 16, and each concave hole 3a of the upper wall 3 of the stirrer main body are located at relative positions such that they can engage with each other. Set the mounting position.

The seal case 5 also has an inflow hole 35 connected to the coolant supply pipe 34 and an outflow hole (not shown) connected to the coolant discharge pipe 36, which are located at appropriate positions facing the rotary seal ring 11. With the coolant flowing into the sol housing 2 from the inlet hole 35, the rotary sealing ring 11 and the first and second static sealing rings 19.26 are relatively rotating sliding contact surfaces. It is designed to provide cooling (and lubrication) for 37.38 months.

The stationary double mechanical seal 1 configured as described above has the first and second sealing ends 37, similar to the conventional one.
, 38, the gas serving as the sealing fluid inside the agitator, that is, the sealing fluid side 39, can be shielded and sealed from the atmosphere side 40.Next, the installation and removal operations of this mechanical seal 1 will be explained.

That is, when removing the mechanical seal 1 from the sole housing 2, first remove the rotating shaft 4, that is, the sleeve 9,
After rotating each connecting plate 31 by an appropriate amount by manual operation or the like so that each concave groove 9a is located at a position that can correspond to each connecting plate 31 housed in the first retainer 15, each connecting plate 31 is The inner peripheral edge 31a of each of the grooves 9
In the state in which the first retainer 15 is engaged with the first retainer 15, it is housed in the two ends of the first retainer 15 by bolts 32 and 32 (see FIGS. 1 and 3). In which state the sleeve 9 and the first retainer 15
are connected so as to be immovable in the axial direction and immovable in relative rotation, and the key 33 of the sleeve 9 is positioned directly opposite the keyway 16d of the second retainer 16 (see FIG. 4). .

Thereafter, the nut member 10 and each nut 18 are removed from the rotating shaft 4 and each stud bolt 17, and the sleeve 9 (and first retainer 15) is manually attached and pulled out upward using a crane or the like.

At this time, as described above, the sleeve 9 and the first reinner 15
Since the rotary sealing ring 11, the first stationary sealing ring 19, and the first retainer 15 are connected to each other without changing their relative positions, the rotating sealing ring 11, the first stationary sealing ring 19, and the first retainer 15 rise following the sleeve 9 without changing their relative positions. You will be forced to do so.

On the other hand, regarding the second retainer 16 and the second stationary sealing ring 26, until the amount of rise of the sleeve 9 exceeds the predetermined amount l,
The second retainer 16 is not caused to follow the rise of the sleeve 9, but is held in a state in which it is in contact with the upper wall 3 of the stirrer main body. 26 is caused to rise following the sleeve 9 while maintaining a state in contact with the rotary sealing ring 11 by the expansion action of the spring 28.

Then, when the amount of rise of the sleeve 9 exceeds the predetermined portion l, the locking portion 9b of the sleeve 9 engages the lower end portion 16 of the second retainer 16.
b, the second retainer 16 is also raised following the sleeve 9, and the key 33 is engaged with the keyway 16d, so that the sleeve 9 and the second retainer 16 cannot rotate relative to each other. will be combined with The locking portion 9b
After the spring 28 abuts against the lower end 16b of the second retainer 16, the expansion operation of the spring 28 is stopped, and the relative position of the first retainer 16 and the second stationary sealing ring 26 in the axial direction is kept constant. It will be done.

In other words, when the sleeve 9 is raised by a predetermined amount l from the state shown in FIG. (See Figure 2).

Therefore, the work of removing the mechanical seal assembly 1 from the sol housing 2 can be done by disassembling the mechanical seal itself into its component parts or removing the mechanical seal assembly 1 from the upper wall 3 of the seal case 5.
This can be done extremely easily and efficiently without requiring any disassembly work of the sol housing 2, such as removing the cooling liquid pipes 34 and 36 from the seal case 5.

In addition, if the mechanical seal 1 can be accommodated in the seal housing 2, please place it outside the pool housing 2 in advance.
The mechanical seal assembly 1 is assembled in the state shown in FIG. 2, and the assembled mechanical seal assembly 1 is lowered into the sol housing 2, and the mechanical seal assembly is removed in the reverse order of the above-mentioned removal operation. 1 into the seal housing 2.

That is, first, each attachment hole 15b of the flange portion 15a of the first retainer 15 is inserted into each corresponding implant port 17 of the pool case 5, and the first retainer 15 and the sleeve 9 are positioned relative to the seal housing 2 in the circumferential direction. conduct. In this state, the sleeve 9 and the second retainer 16 are coupled so that they cannot rotate relative to each other by the engagement between the key 33 and the keyway 16d.
Each of the detent pins 24 is located at a position directly facing each of the recessed holes 3a of the upper wall 3.

Then, as the mechanical seal assembly 1 descends, the lower end 16b of the second retainer 16 is first abutted against the upper wall 3, and each of the detent pins 24 is inserted into each recessed hole 3a.
The second retainer 16 is inserted into the seal housing 2.
It is held in the innermost part of the body so that it cannot relatively rotate and cannot move downwards. At this time, the second retainer 16 is held in a state in which it is in contact with the locking portion 9a of the sleeve 9 due to the applied force of the spring 28, and on the other hand, the second stationary sealing ring 16 is also in contact with the rotating sealing ring 11. is maintained in the same state.

When the mechanical seal assembly 1 is further lowered by a predetermined amount l from this state, that is, the lower end of the sleeve 9 is attached to the stepped portion 4a of the rotating shaft 4, and the flange portion 15a of the first redener 15 is attached to one end of the seal case 5. When the locking portion 9b of the sleeve 9 and the key 33 are lowered until they come into contact, the lower end portion 16b of the second retainer 16 and the keyway 1
6d, and the rotary sealing ring 11
As the second stationary seal ring 26 is lowered, the spring 28 is contracted, and the force of the spring 28 to push the second stationary seal ring 26 onto the rotating seal ring 11 is maintained properly.

In this state, all the constituent members of the mechanical seal 1 are positioned at their normal positions (see Figure 1).
Therefore, after that, the nut member 10 is tightened to fix the sleeve 9 to the rotating shaft 4, and each nut 18 is tightened.
are screwed onto each implant port 17 and tightened, and the first retainer 15 is attached to the seal case 5.Finally, the connecting plate 31,
34 from the first retainers 15, the mechanical seal 1 can be assembled in its normal state.

In this way, the installation work can be done efficiently and easily with the sole housing 2 assembled.
Moreover, since the assembly of the mechanical sol assembly 1 is performed outside the seal nozzle blower 2, there is no risk of large errors in assembly accuracy, regardless of the skill level of the operator.

It should be noted that the configuration of the stationary double mechanical seal according to the present invention is not limited to the above embodiments, and for example,
As shown in FIG. 5, a second
A cylindrical anti-back pressure adapter 41 may be provided to protrude from the upper end of the retainer 16. This adapter 41 is formed with through holes 41a corresponding to the inflow holes 35 and outflow holes (not shown) of the coolant. Note that the configuration of the stationary double mechanical seal 1 shown in FIG. 5 is basically the same as that of the previous example except for the provision of the adapter 41, so each component is in the same arrangement as the previous example. The same subtitles will be given to those that can be used, and the details will be omitted.

If such an adapter 41 is provided, the sealed fluid side 3
Even if a large inverse ratio acts on the lower end portion 16b of the second retainer 16 due to the gas of No. 9, the second retainer 16 can be reliably prevented from accidentally detaching from the upper wall 3. Moreover, when the mechanical seal is housed, the second retainer 16 can be smoothly inserted into the innermost part of the seal housing 2 without relying on the biasing force of the spring 28 as in the previous embodiment.

Further, in each of the embodiments described above, the connecting means 29 and the movement preventing means 30 are configured so that the sleeve 9 and the first retainer 15 and the sleeve 9 and the second retainer 16 can be held so that they cannot rotate relative to each other. Although the mechanical seal is devised so that it can be inserted into the recessed hole 3a of each detent pin 24 from the beginning when it is housed, it is not necessary to take the trouble of configuring it in this way. Of course, there is some inconvenience in performing the above-mentioned engagement, but this is possible, for example, by forming each detent pin 24 with a tapered tip, so that each detent pin 24 has a slight slope from each concave hole 3a. Even if you start, you can make up for it to some extent by devising ways to be able to take care of it.

Furthermore, the first retainer 15 does not have to be directly attached to the seal housing 2 by providing the flange portion 10a integrally, but is indirectly attached to the seal shell 2 via a separate flannel tongue attachment member. There is a lot of work to be done.

Makomoto's standalone stationary type double mechanical norsol has gas agitators such as the above-mentioned examples of various lengths, as well as two-fold shape, floor,
It is suitable for use in valley width equipment such as Tahin.
It was most suitable for use with large tableware.

In any case, as can be easily understood from the above explanation, the newly developed stationary Kufurno Carcal Seal is a mechanical seal assembly that is made into a unit, and cannot be installed in a sealed seal housing that is assembled as is. Since the mechanical seal is configured to be able to be stored and removed, it is possible to perform the work of storing and removing the seeds extremely easily and efficiently compared to conventional models. It is something. This is particularly advantageous for dogs in the case of large equipment that requires some labor to disassemble and assemble the seal housing. Regardless of the level of skill of the worker, there is no risk of variations in the degree of assembly, and a mechanical seal installed by any worker can always exhibit a good sealing function.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the stationary double mechanical seal according to the present invention. Figure 2 is a vertically tilted front view similar to Figure 1 showing the removed state of the mechanical seal, Figure 3 is a cross-sectional bottom view of the main parts taken along line III-III in Figure 1, and Figure 4 is a view of Figure 1. FIG. 5 is a cross-sectional bottom view of the main parts along the IV-IV line, and FIG. 5 is a vertical cross-sectional view equivalent to FIG. 1 showing another embodiment. 1... Stationary double mechanical seal, 1'.・・Mechanical Zealure 7
Assembly, 2... Seal housing, 3... Earthen wall of stirrer main body, 4... Rotating shaft, 9... Sleeve, 10
・・・Knot part shrine, 11...Rotating sealing ring, 15...
1st retainer, 16... 2nd retainer, 19... 1st stationary sealing ring, 24... anti-rotation bottle, 26... 2nd stationary sealing ring, 29... connecting means, 30... ...Movement prevention means. Patent applicant Nippon Pillar Industries Co., Ltd. Agent Patent attorney Koichi Suzue Figure 3 Figure 4

Claims (1)

[Claims] A sleeve with a rotary sealing ring fixed approximately at the center of the rotating shaft portion located inside the seal housing is fitted and fixed so as to be removable outside the seal housing, and the first retainer is removed from the artificial part of the seal housing. Attachment, a second retainer that can be pulled out from the seal housing puffer is engaged and held in the inner deep part of the seal housing so as to be movable only in the direction in which the sleeve is pulled out, and the first and second retainers, The first and second stationary sealing rings are attached and held so as to be pressed against the rotating sealing ring, respectively, and a connecting means is interposed between the sleeve and the first retainer to connect the two so that they cannot move relative to each other in the axial direction. At the same time, a movement preventing means is interposed between the sleeve and the second retainer to prevent relative movement of the second retainer with respect to the sleeve in a direction away from the rotating sealing ring at a predetermined position, so that the entire seal housing is closed. A stationary double mechanical seal characterized by a unit that can be extracted outside.