JPS5827166Y2 - Covered sealing ring - Google Patents

Description

[Detailed description of the invention] This invention is a seal that prevents fluid from flowing out of the machine by blocking the gap between a fixed part such as a casing and a rotating part such as a shaft in the gland part of equipment that handles fluid. It's about rings.

Conventionally, the shaft sealing device applied to the gland of equipment uses a V-ring punching assembly, gland punching, etc. to seal the fluid, but in these shaft sealing devices, multiple sealing rings are attached, so This has the disadvantage that the structure of the gland section of the device also becomes longer in the axial direction.

The first purpose of this invention is to provide a seal that can be made compact in the axial direction by using a single sealing ring, and can be applied as is to existing equipment shaft sealing chambers and is compatible with conventional shaft sealing devices. This is what I am trying to do.

The second purpose is that since the contact area with the conventional packing ring on the shaft or equipment casing increases, the initial tightening force requires a large force, and as a result, the friction torque tends to be excessive. Therefore, it has been difficult to reduce the friction torque and avoid applying extra load to the packing ring, but this is an attempt to solve these problems all at once.

The third object is to provide a sealing ring that can always exhibit a stable sealing function without being affected by changes in the atmosphere such as temperature and pressure or repeated fluctuations.

In the past, there were cases where the ring packing was deformed or the impregnating material leaked out and the sealing function was lost, as with the gland packing, but the present invention solves this problem.

The fourth purpose is to solve the conventional corrosion problem and at the same time expand the range of application by providing corrosion resistance.

The present invention will be explained below based on the drawings.

FIG. 1 shows an assembled sectional view of a covered sealing ring A of the present invention.

Reference numeral 1 denotes a core having a substantially rectangular cross section and made of a highly elastic material such as rubber. This core 1 is covered with a covering ring 2.

The cover ring 2 has a concave cross section, and by fitting the core 1 into this recess, the core 1 is covered with the cover ring 2.

Furthermore, the cover ring 2 is covered with the seal ring 3.

The core 1 is completely covered by the seal ring 3.

Like the cover ring 2, this seal ring 3 also has a concave cross section.

When the cover ring 2 is fitted into the recess of the seal ring 3, it is done so that the core 1, which has already been assembled into the recess of the cover ring 2, is completely surrounded.

That is, by fitting the cover ring 2 and the seal ring 3 into the nesting holes, the entire outer surface of the core 1 is surrounded.

Furthermore, a seal ring protrusion 4゜4' is formed on the outer surface of the seal ring 3.
゜4' has the function of abutting against the casing 5 and shaft 6 of each device to seal fluid.

Further, 7 is a holding plate that supports the covered sealing ring A.

The cover ring 2 and the seal ring 3 are made of tetrafluoroethylene resin (P-T-F-E) and tetrafluoroethylene perfluoroalkyl vinyl ether polymer resin (PF''A).

Tetrafluoroethylene hexafluoropropylene copolymer resin (F'EP
) is preferably a flexible and corrosion-resistant material.

Also, Figure 2 a. Application examples of the seal ring protrusions 4 and 4' of the seal ring 3 are shown in b and c, respectively, and fluid pressure,
It can be appropriately selected depending on conditions such as temperature, and can exhibit an effective sealing function.

Furthermore, Figures 3 and 4 are diagrams showing the difference in sealing function Q between the case where the seal ring protrusions 4 and 4' are formed and the case where they are not formed, and Figure 3 is the one where the seal ring protrusions are not formed. FIG. 4 shows what forms the seal ring protrusion.

Here, P is the axial pressing force acting on the covered sealing ring due to fluid pressure, P is the axial pressing force acting on the covered sealing ring due to atmospheric pressure (atmospheric pressure), Wp
9 The clamping force by the holding plate, Sl is the contact area between the seal ring and the shaft in Figure 3, the contact area between the seal ring and the equipment casing, and S2 is the area of the seal ring protrusion in Figure 4, then the coating The axial force (pressing force P-Po and clamping force Wp) acting on the mold sealing ring is resolved in the radial direction, and the force acting in the radial direction is inversely proportional to the magnitude of 5at82.

Therefore, the radial sealing pressing force acting on the covered sealing ring shown in FIGS. 3 and 4 is W1. If W2, then Sl>S2, so Wl<W2.

In other words, the covered sealing ring according to the present invention, which is equipped with a seal ring protrusion, can effectively reduce the sealing pressing force acting in the radial direction even if the force acting in the axial direction is small (for example, the clamping force by the holding plate is small). This can be achieved by having a rubber core surrounded by a cover ring and a seal ring.

In other words, a rubber body is originally an elastic body and at the same time an incompressible object.For example, just like water or oil, it is not easy to change the volume of the rubber body itself confined in a space by external force. .

The present invention adopts a configuration that allows the unique characteristics of the rubber body to be utilized as is, and also provides an optimal configuration means for a sealing ring.

That is, as described above, the covered sealing ring according to the present invention transmits and converts the force acting in the axial direction into the force acting in the radial direction through the rubber core, and furthermore, the outer surface of the sealing ring The sealing protrusion formed in the seal provides an extremely efficient sealing function.

Moreover, even if the covered sealing ring according to the present invention suffers from distortion due to changes or fluctuations in pressure, temperature, etc., it is constructed so that it can be efficiently absorbed by the elastic force of the rubber core. .

As described above, the covered sealing ring of the present invention having the detailed structure has the following features:
Since it has a configuration that can be used 100% of the time, the following effects can be obtained.

(1) Since a single coated sealing ring can provide a sufficient fluid seal, it is not only compact in the axial direction, but also can be used in place of the conventional shaft sealing device, such as the Grand Punkin. Can be applied to existing equipment shaft sealing rooms.

(2) Strains that occur in the covered sealing ring due to changes and fluctuations in pressure, temperature, etc. can be absorbed by the rubber core, which is an elastic body, and stable sealing surface pressure can be applied to the seal ring protrusion. , always exhibits an effective sealing function.

(3) Since the seal ring protrusion is provided, there is no need to increase the initial tightening force by a presser plate, etc., and an appropriate sealing tightening force can be applied.

(4) The cover ring and seal ring are made of corrosion-resistant fluororesin material, and simply fit the cores together.
It has corrosion resistance because it completely surrounds and protects the core.
Moreover, it is possible to handle up to high pressure.

And it is widely applicable.

[Brief explanation of drawings]

FIG. 1 is an assembled cross-sectional view of essential parts showing an example of a covered sealing ring according to the present invention, and a, b, and c in FIG. 2 are other applications of the seal ring protrusion of the covered sealing ring in FIG. 1. FIG. 3 is a sectional view of essential parts showing a comparative example of a covered type sealing ring without a seal ring protrusion, and FIG. 4 is a main part sectional view showing an example of a covered type sealing ring according to the present invention. FIG. 1... Center core, 2... Covering, 3
... Seal ring, 4 ... Seal ring protrusion, 5 ... Equipment casing, 6 ...
...shaft, 7...pressing plate, A...covered sealing ring.

Claims (1)

[Scope of utility model registration request] A fluororesin cover ring with a concave cross-section and one of the two end faces orthogonal to the axis with a bottom, and a fluororesin seal ring with a concave cross-section with one of the two end faces orthogonal to the axis with a bottom. and the seal ring are fitted into the nesting holes to surround the entire outer surface of the rubber core, and the outer surface of the seal ring is formed with a sealing protrusion that comes into contact with the shaft and the equipment casing. Covered sealing ring.