JPH0452536Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to an orifice-type non-contact vibration isolation mechanism for gas seal devices, and more specifically, to a static seal ring and a stationary seal ring that slide against each other at their sealing end faces. It has a rotating seal ring, and from the stationary seal ring side, seal gas can be supplied to the sealed end face through an orifice formed in the stationary side seal ring retainer, and from the rotating seal ring side, seal gas can be supplied to the sealing end surface through an orifice formed in the stationary side seal ring retainer. This invention relates to an improvement in the vibration isolation mechanism of the rotating side bellows in a gas sealing device configured by holding a seal ring retainer on a bellows that is supported by a bellows retainer and extends in the direction of the rotating shaft.

[Conventional technology]

BACKGROUND ART Conventionally, this type of gas seal device with a bellows formation has been widely used as a mechanical seal against corrosive liquids in a wide temperature range from low to high temperatures.

FIG. 4 is a half-cut longitudinal sectional view showing the general configuration of this type of gas seal device according to the conventional example, and FIG.
The figure is a perspective view showing the vibration-proof adapter taken out.

That is, in these FIGS. 4 and 5, reference numerals 1 and 2 represent the casing and rotating shaft as objects to be sealed.

Further, 3 is a stationary seal ring on the casing 1 side and is fixedly held by a presser cover 5 via a stationary side seal ring retainer 4, and 6, 6 are gasket packings thereof, The orifice 7 is formed,
The seal gas from the gas supply hole 8 of the casing 1 is supplied to the stationary seal ring 3 through this orifice 7.
The liquid can be supplied to a seal pocket 9 formed on the sliding surface 3a.

Furthermore, 10 is located on the rotating shaft 2 side and is fixedly held via a rotating side seal ring retainer 11, a metal bellows 12 extending in the axial direction, and a bellows retainer 13, which are integrally connected to each other, and This is a rotary seal ring in which the sliding surface 10a is brought into contact with the sliding surface 3a of the seal ring 3.The bellows retainer 13 is sealed with a gasket packing 15, and is held against the rotating shaft 2 by a holding ring 14. It is fastened at the top.

Reference numeral 16 denotes a vibration-proofing adapter with a cylindrical through hole 17 for vibration-proofing the metal bellows 12, which is inserted between the rotary-side seal ring retainer 11 and the bellows retainer 13. The vibration-proof adapter 16 is fitted onto the outer peripheral surface of the bellows 12, and the base end of the vibration-proof adapter 16 is fixed to the bellows retainer 13 with a bolt 19.
A vibration-proof O-ring 20 supported by a circumferential groove 18 on the inner circumferential surface of the tip is pressed against the outer circumferential surface of the rotary side seal ring retainer 11.

However, in the case of the conventional bellows type gas seal device constructed as described above, the disadvantage in its construction is the occurrence of self-excited vibration at the sealed end surface due to the compressibility of the sealing gas. This self-excited vibration not only produces abnormal noise, but may also damage the sealing function itself.

Therefore, in the conventional example, as described above, the proximal end is placed between the rotating side seal ring retainer 11 which is on the rotating shaft 2 side and integrally connects the metal bellows 12 extending in the axial direction, and the bellows retainer 13. the part to the bellows retainer 13,
and a vibration-proof O-ring 20 supported on the inner peripheral surface of the tip.
A vibration isolating adapter 16 is provided which is pressed against the outer peripheral surface of the rotating side seal ring retainer 11, and the self-excited vibration of the metal bellows 12 is suppressed by the frictional force and elastic force of the vibration isolating O-ring 20. They are trying to prevent it.

[Problem that the invention attempts to solve]

However, in the conventional configuration, the means for preventing self-excited vibration of the metal bellows 12 using the anti-vibration adapter 16 relies only on the frictional force and elastic force of the anti-vibration O-ring 20 itself. When these frictional forces and elastic forces are reduced due to changes in the anti-vibration O-ring 20 over time, especially due to changes over time due to use under high temperature conditions,
Naturally, there was a problem in that the contact force of the rotary seal ring 10 with the rotary side seal ring retainer 11 and, as a result, the vibration-proofing effect was reduced, and a good vibration-proofing effect was not necessarily obtained.

This invention was made to improve these conventional problems, and its purpose is to provide a stable vibration-proofing effect over a long period of time, regardless of the aging of the vibration-proof O-ring. It is an object of the present invention to provide a vibration isolation mechanism for this type of end-face type gas seal device that can exhibit excellent performance.

[Means for solving problems]

In order to achieve the above object, the vibration isolating mechanism of the end face type gas seal device according to this invention uses a vibration isolating O-ring or a corresponding vibration isolating member having frictional force and elastic force to reduce its own friction. In addition to force and elastic force, it is possible to apply pressure from the outside.

That is, this invention includes at least a stationary seal ring fixedly held on the casing via a stationary side seal ring retainer, a bellows retainer fixed on the rotating shaft, and a rotating seal ring held on the rotating side seal ring retainer. , a gas seal device comprising a bellows that connects the bellows retainer and a rotating side seal ring retainer and extends in the axial direction, the sliding surface of the rotating seal ring being brought into contact with the sliding surface of the stationary seal ring, The rotary side seal ring retainer and the bellows retainer have a holding part that spans between the outer circumferential surfaces of the retainer and has a vibration isolating member held on the inner circumferential surface of the holding part at the tip thereof, and the holding part is held by a flexible elastic member. A vibration-proofing adapter connected to a mounting portion of the base end is arranged to fit over the outer periphery of the bellows, and the base-end mounting portion of the vibration-proof adapter is attached to the outer peripheral surface of the bellows retainer, The vibration isolating member of the gas seal device is characterized in that the vibration isolating member of the tip holding portion is brought into contact with the outer circumferential surface of the rotary side seal ring retainer by the elastic pressing force of an appropriate elastic member including the flexible elastic member. It is a mechanism.

[Effect]

In other words, in this invention, in addition to its own frictional force and elastic force, external pressure is applied to the vibration isolating member of the vibration isolating adapter, so even when used under high temperature conditions, Even if the frictional force and elastic force of the vibration isolating member itself may be reduced due to changes over time, etc., the elastic force of the elastic member, including the flexible elastic member of the vibration isolating adapter, can be The contact pressure of the vibration isolating member against the outer peripheral surface of the rotary side seal ring retainer can be maintained sufficiently high by the pressure applied from the outside to the tip holding part of the vibration isolating adapter through the holder. It becomes possible to stably exhibit the vibration-proofing effect of the bellows.

〔Example〕

Embodiments of the vibration isolation mechanism for a gas seal device according to this invention will be described in detail below with reference to FIGS. 1 to 3.

Fig. 1 is a half-cut vertical sectional view showing the general configuration of a gas seal device to which an embodiment of this invention is applied, Fig. 2 is a perspective view showing the same vibration-proof adapter taken out, and Fig. 3 FIG. 2 is a perspective view showing a main part configuration according to an embodiment. In each figure of these examples,
The same reference numerals as in the conventional example shown in FIG. 4 indicate the same or corresponding parts.

In the embodiments shown in FIGS. 1 and 2, the vibration-proof adapter 21 includes an annular proximal end attachment portion 22 that can be closely fitted to the bellows retainer 13.
The annular pieces 23a, 23a, . . . are divided into a plurality of pieces at predetermined angular intervals, in this case, four pieces at equal angular intervals.
and each of these annular pieces 23a, 23a,...
Each of the flexible elastic members 24, 2
The distal end holding portion 23 is connected to the proximal end attachment portion 22 by 4, . . . .

Thus, each of the annular pieces 23, 23a, . . .
, holding grooves 25, 25... and pressing grooves 2 are formed in series on the inner circumferential surface and the outer circumferential surface.
6, 26... are respectively formed, and a vibration isolating O-ring 27a as the vibration isolating member 27 is held by passing through each holding groove 25, 25..., and a garter spring is inserted into each pressing groove 26, 26... 28
It is wrapped around.

In the case of the configuration of the embodiment shown in FIG. 1 and FIG. Tip holding part 23
The anti-vibration O-ring 27a held within each annular piece 23a, 23a, . . . is attached to the garter spring 2.
Due to the elastic force of tightening from the outer circumferential side by 8, the outer circumferential surface of the rotary side seal ring retainer 11 can be kept in contact with the outer circumferential surface at all times.

That is, in this way, the base end attachment part 22 side of the vibration isolating adapter 21 is fixed to the bellows retainer 13, and the vibration isolating O-ring 27a held on the tip holding part 23 side is pressurized from the outer circumferential side. Since the pressure is applied to the outer circumferential surface of the rotating side seal ring retainer 11, even if the frictional force and elastic force of the vibration-proof O-ring 27a itself are reduced due to changes over time, etc. , the desired anti-vibration effect can be obtained.

In addition, the configuration of the embodiment shown in FIG. 3 is a further simplification of the previous example, in which a flexible elastic piece 29 is used as the vibration-proof adapter 21, and the base end attachment portion 29a side thereof is attached to the bellows retainer 13. At the same time, a vibration isolating member 30 made of an elastomer such as rubber with a predetermined hardness provided on the tip holding portion 29b side is brought into contact with the outer circumferential surface of the rotary side seal ring retainer 11, and this structure is It is placed at a specific location.

That is, also in the configuration of the embodiment shown in FIG.
Due to the elastic force of the flexible elastic piece 29 itself, the vibration isolating member 30 is always attached to the rotating side seal ring retainer 11.
Pressure can be applied to the outer circumferential surface of the cylinder, and the same operation and effect as in the previous example can be obtained.

[Effect of idea]

As detailed above, according to this invention, the proximal end attachment part of the vibration isolating adapter, which is arranged to be fitted over the outer periphery of the bellows, is attached to the outer peripheral surface of the bellows retainer, and the vibration isolating member of the tip holding part is attached to the outer peripheral surface of the bellows retainer.
Since the outer circumferential surface of the rotary side seal ring retainer is brought into contact with the elastic pressure of an appropriate elastic member including a flexible elastic member that connects the distal end holding portion and the proximal end attachment portion, the anti-vibration adapter In addition to its own frictional force and elastic force, it is possible to constantly apply pressure from the outside to the vibration isolating member. Therefore, even if the frictional force and elastic force possessed by the vibration isolating member itself are reduced, the contact force of the vibration isolating member to the rotating side seal ring retainer can be maintained sufficiently high due to the pressurizing force applied from the outside. Therefore, the vibration-proofing effect of the bellows can be maintained reliably and stably for a long period of time.
In addition, the structure is simple and requires only modification of the vibration isolating adapter, and it has practical effects such as being able to easily and inexpensively provide a gas seal device with excellent vibration isolating performance and sealing function.

[Brief explanation of the drawing]

Fig. 1 is a half-cut vertical sectional view showing the general configuration of a gas seal device to which an embodiment of the vibration isolation mechanism according to the invention is applied, Fig. 2 is a perspective view showing the same vibration isolation adapter taken out, and Fig. 3 is a FIG. 4 is a perspective view showing the configuration of main parts according to another embodiment of the same as above, FIG. It is a perspective view taken out and shown. DESCRIPTION OF SYMBOLS 1... Casing, 2... Rotating shaft, 3... Stationary seal ring, 4... Stationary side seal ring retainer, 10... Rotating seal ring, 11... Rotating side seal ring retainer, 12... Metal bellows, 13... Bellows retainer, 21... Anti-vibration adapter, 22, 29a... Base end attachment part, 2
3, 29b... Tip holding part, 23a... Annular piece, 24, 29... Flexible elastic piece, 25... Holding groove, 26... Pressing groove, 27, 30... Vibration isolating member, 27a ...Anti-vibration O-ring, 28...Garter spring.

Claims (1)

[Claims for Utility Model Registration] (1) At least a stationary seal ring fixedly held on the casing via a stationary side seal ring retainer, a bellows retainer fixed on the rotating shaft, and a stationary seal ring held on the rotating side seal ring retainer. a rotating seal ring, and the bellows retainer;
In the gas seal device, the gas seal device includes a bellows extending in the axial direction and connecting the rotating side seal ring retainers, and a sliding surface of the rotating seal ring is brought into pressure contact with a sliding surface of the stationary seal ring, wherein the rotating side seal ring retainer and a holding part that spans between the outer circumferential surfaces of the bellows retainer and has a vibration isolating member held on the inner circumferential surface of the distal end thereof, and this holding part is connected to the attachment part of the proximal end by a flexible elastic member. A vibration-proof adapter connected to the bellows is arranged so as to be fitted over the outer periphery of the bellows, and the base end attachment part of the vibration-proof adapter is attached to the outer circumferential surface of the bellows retainer, and the vibration-proof adapter of the tip holding part is attached to the outer circumference of the bellows retainer. A vibration isolating mechanism for a gas seal device, characterized in that a member is brought into contact with the outer circumferential surface of the rotary side seal ring retainer by the elastic pressing force of an appropriate elastic member including the flexible elastic member. (2) The tip holding portion of the vibration isolating adapter is formed from a plurality of annular pieces divided in the circumferential direction at predetermined angular intervals, and each of these annular pieces is formed into a plurality of flexible pieces in the circumferential direction. The retaining grooves, which are connected to the proximal end attachment portion by elastic pieces and formed on the inner circumferential surface of each of the annular pieces, hold a vibration isolating O-ring as a vibration isolator. A garter spring as an elastic member is wound around the pressing groove formed on the outer circumferential surface of the rotary side seal ring retainer, and the elastic force of these garter springs causes each of the vibration-proof O-rings to come into contact with the outer circumferential surface of the rotary side seal ring retainer. A vibration isolation mechanism for a gas seal device according to claim 1 of the utility model registration claim.