KR20180010410A - Mechanical seal using powered grain size difference - Google Patents

Abstract

The present invention relates to a shaft seal device capable of preventing a fluid from being leaked to a gap between a shaft case and a shaft in a state where the shaft is installed in the shaft case to be rotated or reciprocated and, more specifically, to a shaft seal device using a powder particle size difference, capable of providing high-efficiency airtightness and reducing manufacturing costs and operation maintenance costs by providing an extremely simple structure using a particle size difference of powder. According to the present invention, the shaft seal device, which installs a rotating or reciprocating shaft in a shaft case without fluid leakage, comprises: a stator coupled to the shaft case to be watertight; a plurality of powder filling spaces formed in an annular shape to be partitioned by a partition wall in the stator to be opened toward the shaft; and powder filled in the powder filling space and closely attached to the shaft to prevent a fluid from being leaked, or comprises: a stator coupled to the shaft case to be watertight; a rotor coupled to the shaft to be watertight; a plurality of powder filling spaces formed in an annular shape to be partitioned by a partition wall in the stator to be opened toward the rotor; and powder filled in the powder filling space and closely attached to the rotor to prevent a fluid from being leaked.

Description

[Technical Field] The present invention relates to a mechanical seal using a powder grain size difference,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft end device for preventing a fluid from leaking into a gap between a shaft case and a shaft in a state in which a shaft is provided for rotating or reciprocating the shaft case, It is an object of the present invention to provide a shaft rod apparatus using powder particle size difference which can provide a high efficiency hermeticity together with a manufacturing cost and an operation and maintenance cost reduction effect due to an extremely simple structure using a particle size difference.

In general, the mechanical seal prevents the internal pressure from escaping to the atmosphere along the drive shaft. Applications include turbines, stirrers, pumps, compressors, mixers, and valves. Chemical, food, and industrial machinery Has been used in the first half.

1 is a sectional view of an assembled state including a rotating shaft and a casing in a conventional shaft end device.

As shown in FIG. 3, since a large number of means are used to prevent the fluid flowing out to the outside on the rotating shaft 300, it can be seen that the stator has a complicated structure. And the stator 100 is attached to a case (body), and the rotor 200 is attached to the rotating shaft 300. The stator 100 and the rotor 200 are sealed with the O-rings 150 and 220 inserted into the case and the rotating shaft 300 so that the mounting surface is watertight.

The fluid to be conveyed is directed to the gap between the labyrinth seal 120 and the rotor 200 attached to the stator 100 of the shaft device along the rotating shaft 300 rotating at a high speed, The mating ring 210 of the stator 200 and the primary ring 130 of the stator 100 are brought into close contact with each other by the spring 140 and are rotated at a high speed by the mating ring 210 Frictional heat and abrasion occur due to the fact that a small amount of the working fluid is fed to the injection port 111 to reduce frictional heat and abrasion.

At this time, most of the injected working fluid enters the turbine by a labyrinth seal (120), but partly rides between the mating ring (210) and the primary ring (130) At this time, the blocking fluid is injected into the injection port 113 so that the working fluid exits the shaft device and blocks the leakage of the working fluid to the atmosphere.

The working fluid and the blocking fluid introduced into the injection ports 111 and 113 are combined with each other and discharged to the discharge port 112, so that the fluid is inevitably lost.

The above-described conventional shaft sealing device has a much better sealing performance, energy efficiency and service life than other sealing methods, but has a high price and difficulty in repairing due to complicated structure and expensive materials.

The frictional loss of the sliding surface reduces the service life of the shaft device and requires replacement and repair within 1 to 2 years, resulting in a lot of repair costs and maintenance time, and the discharge of the blocking fluid or the working fluid causes a continuous running cost. Nevertheless, the above-described ball-and-pinion device has a structural problem in that it can not perform complete sealing.

Another prior art of the shaft end device is provided with a shaft end device of Korean Patent Publication (B1) 10-1997-0010869 (Jul. 1, 1997), which is composed of two sets of mechanical A shaft bar device configured to close and seal a sealed area and an atmospheric area via a purge fluid area formed between both mechanical seals by a seal, characterized in that each mechanical seal includes a seal casing and a rotating shaft And a second seal ring which pushes the first seal ring against the first seal ring and supports the first seal ring so as to be able to slide in the axial direction, The first mechanical seal on the sealing area side is constituted by a contact seal which acts as a back pressure of the fluid pressure in the sealing area on the second sealing ring and the second mechanical seal on the air- Buffer composed of non-contact type seal which acts as a back pressure of the fluid pressure mess fluid region, and is characterized in that the injection of purge gas, such as the purge fluid area, be sealed fluid than the low-pressure nitrogen gas.

As another prior art, there has been proposed a shaft end device of Korean Patent Laid-Open Publication No. 10-2003-0068352 (Aug. 23, 2003), which is configured to contact the inner surface of the cylinder with a rotating shaft rotating in the fluid The cylindrical outer shaft has a cylindrical shaft member made of a material having good dry lubricity to receive a fluid pressure and a cylindrical force is generated in the direction of the rotating shaft by the elastic force of the cylindrical shaft member. And the sliding heat generated by the sliding with the rotary shaft is substantially balanced by the thermal expansion force generated in the cylindrical shaft member.

However, the above-described prior art barbed machines also have a problem of high price and maintenance due to complicated structure and expensive materials, and have a structural problem of not being able to completely seal the barbed rod. .

KR 1019970010869 B1 1997.07.01. KR 1020030068352 A 2003.08.21.

Therefore, the inventor of the present invention has found that the use of high-precision parts in the above-described conventional shaft end device raises the manufacturing cost, incurs a burden of operation cost for periodically replacing the shaft end device, The present invention has been researched and developed.

That is, in the present invention, at least one powder filling space is formed in the stator which is in contact with the rotating shaft or the rotor coupled to the rotating shaft, and the powders having different particle sizes are filled in the powder filling space to sequentially drop the fluid pressure, The present invention has been accomplished on the basis of the technical object of the present invention with the object of the present invention by providing a shaft rod device using powder particle size difference so as to completely prevent leakage of fluid pressure by reaching zero point.

According to a first aspect of the present invention, there is provided a shaft end apparatus for installing a shaft rotating or reciprocating in a first shaft case without fluid leakage; A stator coupled to the shaft case in a watertight manner; A plurality of powder filling spaces formed in annular shape so as to be partitioned into barrier ribs on the stator so as to be opened toward the shaft; And powder that is filled in the powder filling space and closely adhered to the shaft to prevent leakage of the fluid.

A shaft end device for installing a shaft rotating or reciprocating in a second shaft case without fluid leakage; A stator coupled to the shaft case in a watertight manner; A rotor fluidly coupled to the shaft; A plurality of powder filling spaces formed in an annular shape so as to be partitioned into partitions on the stator so as to be opened toward the rotor; And powder that is filled in the powder filling space and is in close contact with the rotor to prevent leakage of the fluid.

And thirdly one or more powder filling spaces.

Fourthly, the powder filling space located at the edge of the plurality of powder filling spaces is filled with powder having a large particle size, and powder having a small particle size is filled into the powder filling space located at the center to fill the powder having the smallest particle size .

Fifth, powder having a different particle size is mixed with one or more powder filling spaces to increase packing density.

And the sixth stator is characterized in that an injection port sealed by respective plugs is formed so as to inject powder into each powder filling space.

Seventh, on both sides of the stator, the inner surface of the stator is combined with a shaft or a rotor coupled to the shaft, and a powder blocking seal spaced to a smaller size than the powder particle size.

Eighth, a partition formed in the stator so as to partition the powder filling space and a spacing space formed between the shaft and the rotor coupled to the shaft are provided to have the same size as the powder size or smaller than the powder size, Thereby minimizing the movement toward the filling space.

Ninthly, the stator is further provided with a fluid injection hole for supplying a fluid to the shaft or the rotor side opposite to the side where the fluid pressure is provided, and the fluid is sprayed to prevent the powder from being lost.

The following effects can be provided when the shaft rod device using the powder particle size difference provided by the present invention is used.

- It can be provided with a simple structure that does not have precision parts compared with existing ball end devices, so there is no fear of malfunction.

- It is possible to make the life long by simple replenishment of powder or the like, and it is a structure that the operation maintenance cost is scarcely taken because there is no need for a blocking fluid for loss.

- The existing rod end device is very high price due to expensive materials with very complicated structure, but the present invention can be manufactured at a low cost due to the structural simplicity.

- Completely sealable by pressure resistance in a configuration in which the powder contacts the surface of the shaft or rotor.

FIG. 1 is an assembled state sectional view including a rotating shaft and a casing in a conventional shaft-
2 is a cross-sectional view showing a preferred embodiment of the shaft rod device using the powder particle size difference provided by the present invention
Fig. 3 is a side sectional view of Fig. 2
4 is a cross-sectional view showing another embodiment of the shaft rod apparatus using the powder particle size difference provided by the present invention
Fig. 5 is a side sectional view of Fig. 4

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred embodiment of a shaft end device using powder particle size difference provided in the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a sectional view showing a preferred embodiment of a shaft end device using powder particle size difference provided in the present invention, and FIG. 3 is a side sectional view of FIG. 1. 4 is a cross-sectional view showing another embodiment of a shaft end device using powder particle size difference provided in the present invention, and FIG. 5 is a side sectional view of FIG. 4.

The shaft end device 1 using the difference in particle size of powder provided in the present invention is configured such that the shaft 3 is installed to penetrate the shaft case 2 as shown in the figure so that the shaft 3 can be rotated or linearly reciprocated , And the shaft (3) without fluid leakage.

In the present invention, a stator 4 is installed in the shaft case 2, and a plurality of powder filling spaces 411, 412, 413 and 414 422, 423, 424, and 425 having different particle sizes are formed in the respective powder filling spaces 411, 412, 413, 414, and 415, As shown in FIG. At this time, a plurality of o-rings (5) are assembled between the shaft case (2) and the stator (4).

The powder filling spaces 411, 412, 413, 414 and 415 enclose the shaft 3 as shown in FIG. 2, and the shaft 3 is watertight In the present invention, five powder filling spaces 411, 412, 413 and 414 are formed in the annular shape of the stator 4 so as to surround the rotors 6, ) 415 is formed.

Inlets 43 for filling powders 421, 422, 423, 424, and 425 having different particle sizes are formed in the respective powder filling spaces 411, 412, 413, 414, Respectively, and the injection port 43 is sealed by the cap 44. [0050] As shown in Fig. In this configuration, the powders 421, 422, 423, 424, and 425 are injected into the respective powder filling spaces 411, 412, 413, 414, and 415 through the injection port 43 The plug 43 is blocked by the cap 44 to prevent the powder 421, 422, 423, 424, and 425 from flowing out to the outside. This configuration also provides ease of maintenance. That is, when the powders 421, 422, 423, 424, and 425 in the powder filling spaces 411, 412, 413, 414, and 415 are partially lost by abrasion or the like, And the powder 421, 422, 423, 424, and 425 are replenished through the injection port 43, and the like.

On the other hand, in the case of the partition wall 41 formed in the stator 4 to partition the powder filling spaces 411, 412, 413, 414 and 415, the shaft 3 or the rotor 3 The powders 421, 422, 423, 424, and 425 filled in the powder filling spaces 411, 412, 413, 414, and 415 are discharged to the outside A meaningful spacing space P is required to prevent it from being damaged.

To this end, in the present invention, the spacing space P formed between the partition wall 41 and the shaft 3 or the rotor 6 coupled to the shaft 3 is provided with a size equal to or smaller than the powder particle size To block the movement of the powders 421, 422, 423, 424 and 425 into the neighboring powder filling spaces 411, 412, 413, 414 and 415, or So that it can be minimized.

The powder blocking seal 8 is coupled to both sides of the stator 4 and the space between the inner surface of the powder blocking seal 8 and the rotor 6 coupled to the shaft 3 or the shaft 3, (421), (422), (423), (424), and (425), thereby providing a function of preventing the powder from being lost.

The powder filling spaces 411, 412, 413, 414 and 415 are filled with powders 421, 422, 423, 424 and 425 to be in contact with the shaft 3, The powder filling spaces 411 and 415 located at the edges of the plurality of powder filling spaces 411, 412, 413, 414 and 415 are filled with powders 421 and 425 of large particle sizes, The powder 423 having the smallest particle size is filled in the powder filling space 413 positioned at the center.

It is preferable that at least three types of the powders 421, 422, 423, 424, and 425 are applied as shown in the figure. However, when powder having a different particle size is filled in one space, A powder having a small particle size is filled between the spaces formed between the powders, thereby increasing the packing density and obtaining a similar effect to a plurality of intimate organic bonds.

The powders 421, 422, 423, 424, and 425 refer to a general material including ceramics, metal, high-strength plastic, and the like and a composite thereof. It is preferable to use high strength ceramics such as high strength plastic or high strength metals such as titanium, titanium alloy, tungsten and tungsten alloy and carbon, carbon composite, alumina (Al2O3), silicon nitride (Si3N4) have.

The powder to be used is determined depending on the type of the fluid flowing into the shaft device 1. [ That is, it is important to select stable powder with low reactivity with fluid, so that specific powder can not be specified.

The stator 4 is further provided with a fluid injection hole 9 for supplying a fluid toward the shaft 3 or the rotor 6 on the side opposite to the side where the fluid pressure is provided.

411, 412, 413, 414, and 415 when injecting the blocking fluid into the fluid injection hole 9 can be injected into the fluid injection hole 9, 422, 423, 424 and 425 which are filled in the shaft 3 are prevented from flowing out to the outside and the function of preventing the outflow of the powders 421, The powder 421, 422, 423, 424, and 425 are prevented from being deformed into high temperature and lose their functionality.

That is, the powder 421 filled in the powder filling space 411 on the side where the fluid pressure is provided is blocked by the fluid pressure while the powder 425 filled in the powder filling space 415 on the opposite side is pressurized by the atmospheric pressure The powder 425 is pressed toward the powder filling space 415 when the fluid for blocking is injected into the fluid injection hole 9 as described above and flows out to the outside Be able to clear out the concerns of.

Hereinafter, the operation of the shaft end device 1 using the powder particle size difference according to the present invention will be described.

422, 423, 424, and 425 having different particle sizes are formed in a plurality of powder filling spaces 411, 412, 413, 414, and 415 formed in the stator 4, The fluid is caused to flow along the rotation axis to a gap between the rotor 6 and the powder blocking seal 8 attached to the side surface of the stator 4, The fluid proceeds toward the powder 421 filled in the powder filling space 411 formed on the edge side of the stator 4 in a state in which the pressure is primarily reduced in the powder blocking seal 8.

At this time, a secondary pressure reduction occurs by the powder 421 filled in the powder filling space 411, and the powder 422 of the next powder filling space 412 and the powder filling space 413 The pressure is continuously reduced by the powder 423 of the powder.

That is, since the small powder 423 particles form a large number of layers, the fluid pressure continues to decrease rapidly as the fluid passes through the layers, and finally the fluid pressure becomes equal to the atmospheric pressure, thereby achieving a perfect watertight sealing.

On the other hand, the powder 425 filled in the powder filling space 415 located on the opposite side where the pressure is generated on the basis of the powder filling space 413 at the center prevents the powder 424 from flowing out, and the powder 424 prevents the powder 424 423) to the outside.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of protection of the present invention should not be limited to the described embodiment, but should be determined by the equivalents as well as the claims that follow.

1: Axial device (using powder particle size difference)
2: Shaft case 3: Shaft
4: stator 41:
411, 412, 413, 414, 415: powder filling space 421, 422, 423, 424, 425: powder
43: inlet 44: plug
5,7: O-ring 6: Rotor
8: powder blocking seal 9: fluid injection hole

Claims (9)

A shaft end device (1) for installing a shaft (3) rotating or reciprocating on a shaft case (2) without fluid leakage;
A stator (4) tightly coupled to the shaft case (2);
A plurality of annularly formed powder filling spaces 411, 412, 413, 414, and 415 partitioned by the partition 41 into the stator 4 so as to open toward the shaft 3;
Powders 421, 422, 423, and 424 that are filled in the powder filling spaces 411, 412, 413, 414, and 415 to be in close contact with the shaft 3 to prevent the fluid from leaking 425). ≪ RTI ID = 0.0 > 41. < / RTI >
A shaft end device (1) for installing a shaft (3) rotating or reciprocating on a shaft case (2) without fluid leakage;
A stator (4) tightly coupled to the shaft case (2);
A rotor (6) tightly coupled to the shaft (3);
A plurality of annularly formed powder filling spaces 411, 412, 413, 414, and 415 partitioned by the stator 4 into barrier ribs 41 so as to open toward the rotor 6;
Powders 421, 422, 423, and 424 filled in the powder filling spaces 411, 412, 413, 414, and 415 to prevent fluid from leaking from the powder filling spaces 411, (425). ≪ RTI ID = 0.0 > 41. < / RTI >
The method according to claim 1 or 2,
And a plurality of powder filling spaces.
The method according to claim 1 or 2,
Powders 421 and 425 having a large particle size are filled in the powder filling spaces 411 and 415 located at the edges of the plurality of powder filling spaces 411, 412, 413, 414 and 415, And the powder 423 having the smallest particle size is filled in the powder filling space 413 located at the center by filling powder having a small particle size toward the center.
The method according to claim 1 or 2,
Wherein the filling density is increased by mixing powders having different particle sizes in one or more powder filling spaces.
The method according to claim 1 or 2,
The stator 4 is provided with a powder filling space 411 for injecting the powders 421, 422, 423, 424, 425 into the respective powder filling spaces 411, 412, 413, 414, ) 412, 413, 414, and 415 are formed with plugs and injection ports, respectively.
The method according to claim 1 or 2,
The inner surface of the stator 4 is spaced apart from the rotor 6 and the powder 421, 422, 423, 424, and 425, which are coupled to the shaft 3 or the shaft 3, And a powder blocking seal (8) for preventing the powder particles from contacting with each other.
The method according to claim 1 or 2,
A partition wall 41 formed in the stator 4 to partition the powder filling spaces 411, 412, 413, 414 and 415 and a rotor 41 coupled to the shaft 3 or the shaft 3 422, 423, 424, and 425 are formed to have a size equal to or smaller than that of the powder particles so that the powder spaces 421, 422, 423, 424, (411), (412), (413), (414) and (415) are minimized.
The method according to claim 1 or 2,
Characterized in that the stator (4) is further provided with a fluid injection hole (9) for supplying a fluid to the shaft (3) or the rotor (6) side opposite to the side where the fluid pressure is provided.

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