KR20210092076A - Sealing assembly and fluid machinery using the sealing assembly - Google Patents

Abstract

Embodiments of the present invention include a sealing assembly and a fluid machine using the same. A sealing assembly according to an embodiment of the present invention is a sealing assembly comprising a ring-shaped holder and a sealing unit inserted into the holder, wherein the holder is disposed on a drive shaft of a fluid machine and has an insertion groove formed by cutting one surface along the circumferential direction. The sealing unit includes: a base which is inserted into the insertion groove and has an elastic material; and a brush that is an aggregate of a plurality of bristles, wherein one end is disposed on the base and the other end protrudes in a radial direction.

Description

SEALING ASSEMBLY AND FLUID MACHINERY USING THE SEALING ASSEMBLY

Embodiments of the present invention relate to a sealing assembly and a fluid machine using the same.

Sealing members are used to maintain airtightness of fluid machines such as compressors or turbines. The sealing member is a metal pin or brush having a predetermined rigidity, and may be disposed on one side of the fluid machine. While the sealing member is inserted into a separate case, one end of the sealing member comes into contact with a part of the fluid machine (shaft or case, etc.) to form a very narrow gap. A working fluid or a fluid containing a lubricant flowing at high speed passes through this gap, and then expands in a relatively wide space formed between the sealing members to reduce the pressure. Accordingly, the fluid does not leak to the outside.

The sealing member consists of a thin pin or brush, and is often worn or broken during operation of the fluid machine. Since the conventional sealing member is fixed to the case by screws or welding, it takes a lot of time and money to replace the damaged sealing member.

The above-mentioned background art is technical information that the inventor possessed for the purpose of derivation of the present invention or acquired during the derivation of the present invention, and cannot necessarily be said to be a known technique disclosed to the general public before the filing of the present invention.

Japanese Patent Publication No. 5279869

SUMMARY Embodiments of the present invention provide a sealing assembly capable of significantly reducing time and cost required for replacement and maintenance, and a fluid machine using the same. However, this is an example, and the object of the present invention is not limited thereto.

A sealing assembly according to an embodiment of the present invention is a sealing assembly including a ring-shaped holder and a sealing unit inserted into the holder, wherein the holder is disposed on a drive shaft of a fluid machine, and one surface is cut along the circumferential direction. Having an insertion groove formed, the sealing unit includes a base which is inserted into the insertion groove and has an elastic material, and one end is disposed on the base, and the other end includes a brush that is an assembly of a plurality of bristles that protrude in a radial direction.

In the sealing assembly according to an embodiment of the present invention, the sealing unit may apply a tensile force or a compressive force to the base, then release the tensile force or compressive force, so that the base may be inserted into the insertion groove.

In the sealing assembly according to an embodiment of the present invention, in the holder, the insertion groove is disposed on at least one of an outer circumferential surface and an inner circumferential surface of the holder, and the base is compressed from the inside of the holder, and the compressive force is released to release the It may be inserted into the insertion groove disposed on the inner circumferential surface of the holder, or the tensile force may be released in a tensioned state from the outside of the holder and inserted into the insertion groove disposed on the outer circumferential surface of the holder.

In the sealing assembly according to an embodiment of the present invention, the holder has a pair of protrusions spaced apart from each other at a predetermined interval and disposed to face each other, and the insertion groove is a first space between the pair of protrusions. A space and a second space connected to the first space and disposed adjacent to the pair of protrusions may be provided.

In the sealing assembly according to an embodiment of the present invention, a volume of the first space may be smaller than a volume of the second space.

A fluid machine according to another embodiment of the present invention is a fluid machine including a driving part, a driving shaft connected to the driving part, and a sealing assembly disposed on the driving shaft to prevent leakage of fluid, wherein the sealing assembly has a ring shape. A sealing assembly including a holder of a , and a sealing unit inserted into the holder, wherein the holder is disposed on the drive shaft of the fluid machine and has an insertion groove formed by cutting one surface in a circumferential direction, the sealing unit comprising: It includes a base inserted into the insertion groove and having an elastic material, and one end is disposed on the base, and the other end includes a brush that is an aggregate of a plurality of bristles protruding in a radial direction.

Other aspects, features and advantages other than those described above will become apparent from the following detailed description, claims and drawings for carrying out the invention.

The sealing assembly and the fluid machine using the same according to the embodiments of the present invention can maintain airtightness with a simple configuration, and can significantly reduce the time and cost required for replacement and maintenance. In addition, the sealing assembly and the fluid machine using the same according to embodiments of the present invention may more reliably maintain airtightness by integrally configuring the holder and the sealing unit.

The sealing assembly and the fluid machine using the same according to embodiments of the present invention can achieve weight reduction by using a base made of an elastic material without using screws or welding to fix the sealing unit.

1 is a view showing an example of a fluid machine to which a sealing assembly according to an embodiment of the present invention is applied.
FIG. 2 is a plan view illustrating the sealing assembly of FIG. 1 .
Fig. 3 is a view showing the holder of Fig. 1;
4 is a cross-sectional view taken along IV-IV of FIG. 3 .
FIG. 5 is a plan view illustrating the sealing unit of FIG. 1 .
6 is a cross-sectional view taken along VI-VI of FIG. 5 .
7 is a view illustrating a state in which the sealing unit of FIG. 1 is inserted into the holder.
FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 2 .
9 and 10 are views showing a cross-section of a holder according to another embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the description of the invention. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In the description of the present invention, even though illustrated in other embodiments, the same identification numbers are used for the same components.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, the present invention will be described in detail with reference to embodiments related to the present invention shown in the accompanying drawings. For reference, unless otherwise specified, in the present specification, the radial direction, the circumferential direction, and the longitudinal direction may mean the radial direction, the circumferential direction, and the longitudinal direction of the driving shaft 10 of the fluid machine or the sealing assembly 100 . In addition, unless otherwise specified, in the present specification, the fluid may mean including a working fluid and a lubricant.

1 is a diagram illustrating an example of a fluid machine to which a sealing assembly 100 according to an embodiment of the present invention is applied.

Referring to FIG. 1 , the fluid machine to which the sealing assembly 100 according to an embodiment of the present invention is applied includes all machines that produce mechanical energy from a working fluid or receive power from the outside to compress or move the working fluid. include For example, the fluid machine may be a turbine, compressor or pump, or the like.

The fluid machine includes a drive unit (not shown), for example, a rotor of a turbine or a compressor, a drive shaft 10 connected to the drive unit to rotate integrally, and an outer case 20 having an inner space in which the drive shaft 10 is disposed. ) may be included. Also, as indicated by an arrow in FIG. 1 , a working fluid such as air or a fluid including a lubricant may flow between the drive shaft 10 of the fluid machine and the outer case 20 .

The sealing assembly 100 may be disposed on the drive shaft 10 of the fluid machine to prevent leakage of fluid. For example, as shown in FIG. 1 , a plurality of sealing assemblies 100 may be disposed on the outer peripheral surface of the driving shaft 10 in the axial direction. Although it is shown that three sealing assemblies 100 are disposed in the axial direction of the driving shaft 10 in FIG. 1 , the number of sealing assemblies 100 is not particularly limited.

The sealing assembly 100 may be mounted on the driving shaft 10 to seal a gap between the driving shaft 10 and the outer case 20 . The fluid flows through the gap between the sealing assembly 100 , in particular the sealing unit 120 itself, or between the sealing assembly 100 and the outer case 20 . When the fluid passes through the space between the sealing units 120 , the fluid rapidly expands to decrease the flow rate and pressure. As this process is repeated, the flow velocity and pressure of the fluid become very low, and the fluid does not pass through the sealing assembly 100 disposed at the end of the flow direction.

FIG. 2 is a plan view showing the sealing assembly 100 of FIG. 1 , FIG. 3 is a view showing the holder 110 of FIG. 1 , and FIG. 4 is a cross-sectional view taken along IV-IV of FIG. 3 .

1 to 4 , the sealing assembly 100 may include a ring-shaped holder 110 and a sealing unit 120 inserted into the holder 110 .

The holder 110 is disposed on the drive shaft 10 of the fluid machine, and has an insertion groove 111 formed by cutting one surface along the circumferential direction. The holder 110 is an annular rigid body having an inner radius r0 , and r0 may correspond to an outer radius of the drive shaft 10 . The holder 110 has an insertion groove 111 formed by cutting an outer circumferential surface along the circumferential direction. The insertion groove 111 may be continuously formed along the circumferential direction of the holder 110 . The sealing unit 120 may be inserted into the insertion groove 111 .

The holder 110 is provided with a pair of protrusions 112 spaced apart from each other at a predetermined interval and disposed to face each other. The protrusions 112 may extend from the outer wall of the holder 110 , and may be spaced apart by a distance D1 in the first direction, for example, the X-axis direction of FIG. 4 .

The insertion groove 111 includes a first space 111a and a second space 111b. The first space 111a is a space disposed outside of the insertion groove 111 , and may be a space partitioned by a pair of protrusions 112 . In the first space 111a , the sealing unit 120 may be mounted through an open inlet, and at least a portion of the sealing unit 120 may be disposed. In particular, the base 21 into which the brush 122 is inserted may be disposed in the first space 111a.

The second space 111b is connected to the first space 111a and is disposed adjacent to the pair of protrusions 112 . The second space 111b may be a space partitioned by an inner wall and a bottom wall of the insertion groove 111 . The second space 111b may constitute a seating portion in which the sealing unit 120 is disposed.

In an embodiment, the volume of the first space 111a may be smaller than the volume of the second space 111b. Accordingly, in a state in which the sealing unit 120 is disposed inside the insertion groove 111 , the base 121 is stably disposed and fixed inside the first space 111a. Also, the brush 122 may be disposed to face the outside in the second space 111b and may be stably supported by the protrusion 112 .

FIG. 5 is a view showing the sealing unit 120 of FIG. 1 , and FIG. 6 is a cross-sectional view taken along VI-VI of FIG. 5 .

5 and 6 , the sealing unit 120 includes a base 121 inserted into the insertion groove 111 of the holder 110 , one end is disposed on the base 121 , and the other end protrudes in the radial direction. It may include a brush 122 that is an aggregate of a plurality of bristles.

The base 121 is disposed inside the sealing unit 120 . In a state in which no external force is applied, the base 121 may have a ring shape having an inner radius r1. In addition, the width of the radial cross-section of the base 121 may be D2.

In one embodiment, the base 121 may be made of a material having a predetermined elastic force. For example, the base 121 may be formed of a rubber material, a silicone material, or the like. Since the base 121 has an elastic force, the shape may be deformed as an external force is applied.

The base 121 may be tensioned or compressed in one direction, for example, an X-axis direction and/or a Y-axis direction. Also, as the base 121 is stretched or compressed in one direction, the shape and/or area of the cross-section of the base 121 may also be deformed.

The brush 122 is an aggregate of a plurality of bristles. 6 shows that the interval between the bristles is relatively wide for convenience of explanation, but the density of the bristles is not particularly limited. A plurality of bristles may be disposed in the X-axis direction and the Z-axis direction.

The brush 122 may be integrally formed with the base 121 in a state where one end is disposed inside the base 121 . For example, in the process of forming the base 121 of an elastic material, the brush 122 is inserted to a predetermined depth of the base 121 before the base 121 is completely solidified, and then the base 121 is solidified. to form the sealing unit 120 . Accordingly, the brush 122 may be securely fixed to the base 121 .

In one embodiment, one end of the brush 122 may be disposed at a position deeper than half of the width D2 in the radial direction of the base 121 . Accordingly, the brush 122 is more securely fixed to the base 121 , and even if the shape of the base 121 is changed, the brush 122 can be prevented from being separated from the base 121 .

FIG. 7 is a view showing a state in which the sealing unit 120 of FIG. 1 is inserted into the holder 110 , and FIG. 8 is a cross-sectional view taken along VIII-VIII of FIG. 2 .

Referring to FIG. 7 , in a state in which no external force is applied, the sealing unit 120 may have an inner radius r1 and may have a ring shape having a central axis AX1 . In addition, the holder 110 into which the sealing unit 120 is inserted may have an outer radius r2, and may have a ring shape having a central axis AX1. Here, since the inner radius r1 is greater than the outer radius r2, the sealing unit 120 cannot be inserted into the holder 110 in an untensioned state. Accordingly, in order to insert the sealing unit 120 into the holder 110 , the sealing unit 120 is stretched in the radial direction.

More specifically, when the sealing unit 120 is pulled in the radial direction, the base 121, which is an elastic material, is stretched in the radial direction. As shown in FIG. 7 , when the inner radius of the sealing unit 120 increases from r1 to r3 and becomes larger than the outer radius r2 of the holder 110 , the sealing unit corresponds to the position of the insertion groove 111 of the holder 110 . (120) is placed. As the base 121 of the sealing unit 120 is stretched in a radial direction, a cross-section in the radial direction has an elliptical shape. In addition, the cross section of the elliptical shape may have a width D3. And when the tensile force is removed from the sealing unit 120 , the base 121 is inserted into the insertion groove 111 while contracting in the radial direction by the restoring force. Accordingly, the base 121 may be inserted into the insertion groove 111 disposed on the outer circumferential surface of the holder 110 by releasing the tensile force in the tensioned state from the outside of the holder 110 .

In one embodiment, the distance D1 between the protrusions 112 of the holder 110, the width D2 of the cross-section of the base 121 before tensioning, and the width D3 of the cross-section of the tensioned base 121 are D2 > D1 > The relation of D3 can be satisfied. Accordingly, the base 121 can be easily inserted into the insertion groove 111 , and it is possible to prevent the inserted base 121 from leaving the insertion groove 111 .

In another embodiment, the sealing assembly 100 may be disposed on the inner circumferential surface of the outer case 20 so that the brush 122 is in contact with the outer circumferential surface of the driving shaft 10 .

In this case, the sealing unit 120 may be inserted into the insertion groove 111 of the holder 110 in a compressed state. More specifically, the sealing unit 120 may include a base 121 and a brush 122 with one end disposed inside the base 121 and the other end protruding radially inward. And, the holder 110 is disposed on the inner peripheral surface of the outer case 20, it may be provided with an insertion groove 111 formed toward the radially inner side. In addition, the outer radius of the sealing unit 120 may be greater than the inner radius of the holder (110). In this case, the base 121 may be compressed in the circumferential direction to be inserted into the insertion groove 111 . Accordingly, the base 121 may be inserted into the insertion groove 111 disposed on the inner circumferential surface of the holder 110 by releasing the compressive force while the base 121 is compressed inside the holder 110 .

In this case, the holder 110 may have an outer radius (not shown) corresponding to the inner radius of the outer case 20 .

Referring to FIG. 8 , the base 121 inserted into the insertion groove 111 may be deformed to have a shape corresponding to the inner surface of the insertion groove 111 . In addition, in a state inserted into the insertion groove 111 , the base 121 is fixed in position by a pair of protrusions 112 , and is prevented from being separated from the insertion groove 111 . That is, the pair of protrusions 112 limit the movement of the base 121 and function as a locking part for fixing the position.

9 is a view showing a cross-section of a holder 110' according to another embodiment of the present invention.

Referring to FIG. 9 , the holder 110 ′ may include a pair of protrusions 112 ′. The protrusions 112' protrude inwardly from the outer wall of the holder 110', like the protrusions 112 of the above-described embodiment, and are spaced apart from each other by a distance D1.

In the pair of protrusions 112 ′, a surface adjacent to the first space 111 ′ is inclined at a predetermined angle toward the center to form an inclined surface 113 . That is, the inclined surface 113 has a predetermined amount of protrusion toward the first space 111'a in the height direction. Accordingly, the side surfaces of the inclined surface 113 and the protrusion 112 ′ more securely fix the base 121 inserted into the insertion groove 111 ′ from both sides, thereby limiting the movement of the base 121 . It can perform negative functions.

In another embodiment, a corner between the protrusion 112 ′ and the inclined surface 113 may be rounded. Accordingly, it is possible to prevent the base 121 from being damaged by the edge during the insertion process.

10 is a view showing a cross-section of a holder 110" according to another embodiment of the present invention.

Referring to FIG. 10 , the holder 110 ″ may include a pair of protrusions 112 ″. The protrusions 112 ″ are formed to protrude inward from the outer wall of the holder 110 ″, like the protrusions 112 of the above-described embodiment, and are spaced apart from each other by a distance D1. A surface of the protrusion 112 ″ adjacent to the first space 111 ″a is partially cut off to form a depression 114 . Since the recessed part 114 forms an unevenness together with the protrusion 112", the base 121 inserted into the insertion groove 111" is more securely fixed from both sides, thereby limiting the movement of the base 121. It can perform the function of the locking part.

In one embodiment, due to the depression 114 , the first space 111 "a and the second space 111 "b overlap each other in the height direction. Accordingly, the base 121 may be more stably fixed to the inside of the first space 111"a and the second space 111"b.

The sealing assembly 100 and the fluid machine using the same according to an embodiment of the present invention can reliably prevent fluid leakage from inside and outside the fluid machine even with a simple configuration.

In the sealing assembly 100 and the fluid machine using the same according to an embodiment of the present invention, the holder 110 and the sealing unit 120 constituting the sealing assembly 100 do not consist of a plurality of segments. , since they are each formed as an integral member, it is possible to more reliably maintain the airtightness of the fluid machine.

The sealing assembly 100 and the fluid machine using the same according to an embodiment of the present invention can easily assemble and disassemble the holder 110 and the sealing unit 120 by using the base 121 made of an elastic material. . Accordingly, compared to the conventional sealing unit using screws or welding, the time and cost required for assembling and disassembling the sealing unit 120 from the holder 110 can be dramatically reduced, and the weight of the sealing assembly 100 can be reduced. can be achieved In particular, by removing only the base 121 from the holder 110 without the need to remove the holder 110 from the drive shaft 10 or the outer case 20, the sealing unit 120 can be replaced.

In the present specification, the present invention has been described with reference to limited embodiments, but various embodiments are possible within the scope of the present invention. In addition, although not described, it will be said that equivalent means are also combined with the present invention as it is. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

100: sealing assembly
110: holder
120: sealing unit

Claims (6)

A sealing assembly comprising a ring-shaped holder and a sealing unit inserted into the holder,
the holder
It is disposed on the drive shaft of the fluid machine and has an insertion groove formed by cutting one surface along the circumferential direction,
The sealing unit is
a base inserted into the insertion groove and having an elastic material; and
A sealing assembly including; a brush having one end disposed on the base and the other end being an aggregate of a plurality of bristles protruding in a radial direction. According to claim 1,
The sealing unit is
After applying a tensile force or compressive force to the base, by releasing the tensile force or compressive force, the base is inserted into the insertion groove. According to claim 1,
the holder
The insertion groove is disposed on at least one of an outer circumferential surface and an inner circumferential surface of the holder,
the base is
In a compressed state inside the holder, the compression force is released and inserted into the insertion groove disposed on the inner circumferential surface of the holder,
In a state in which it is tensioned from the outside of the holder, the tension force is released and the sealing assembly is inserted into the insertion groove disposed on the outer circumferential surface of the holder. According to claim 1,
the holder
A pair of protrusions spaced apart from each other at a predetermined interval and disposed to face each other,
The insertion groove is
a first space that is a space between the pair of protrusions; and
and a second space connected to the first space and disposed adjacent to the pair of protrusions. 5. The method of claim 4,
and a volume of the first space is smaller than a volume of the second space. A fluid machine comprising: a driving part; a driving shaft connected to the driving part; and a sealing assembly disposed on the driving shaft to prevent leakage of fluid,
The sealing assembly is
A sealing assembly comprising a ring-shaped holder and a sealing unit inserted into the holder,
the holder
and an insertion groove disposed on the drive shaft of the fluid machine and formed by cutting one surface along the circumferential direction;
The sealing unit is
a base inserted into the insertion groove and having an elastic material; and
A fluid machine including; a brush having one end disposed on the base and the other end being an aggregate of a plurality of bristles protruding in a radial direction.

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