KR101985932B1 - Valve assembly - Google Patents

Abstract

The present invention relates to a valve assembly that opens and closes a flow path by opening and closing a flow path of a valve stem connected to a stem by an operation of an actuator. More specifically, the actuator rotates a stem, The present invention relates to a valve assembly that stably absorbs thrust generated by expansion or contraction due to high temperature and protects a valve and an actuator from an overload of an inertial force due to high-speed rotation, thereby improving durability.

Description

Valve assembly {VALVE ASSEMBLY}

The present invention relates to a valve assembly that opens and closes a flow path by opening and closing a flow path of a valve stem connected to a stem by an operation of an actuator. More specifically, the actuator rotates a stem, The present invention relates to a valve assembly that stably absorbs thrust generated by expansion or contraction due to high temperature and protects a valve and an actuator from an overload of an inertial force due to high-speed rotation, thereby improving durability.

In general, a valve is used to control or intermittently control the amount of flow while flowing a fluid such as gas or liquid.

There are various kinds of valves according to the operation principle of the valve, but valves such as a gate valve, a globe valve, and a plate stock valve are configured to be opened or closed by up-down movement or axial movement of the valve stem axis, Gears, and rotating shafts, or an opening / closing operation device.

Prior art related to this is disclosed in " Valve and stem sealing assembly " in Japanese Patent Laid-Open No. 10-2014-0082834,

The prior art suggests a more robust valve and stem sealing assembly that can prevent leakage under stringent environmental and operating conditions, including a bonnet and body that are secured together to receive flow-element, stem, and stem sealing assemblies.

However, when the high-temperature or ultra-low-temperature fluid flows into the pipe which is opened or closed by the valve, the valve such as the above-mentioned prior art causes thermal expansion or heat shrinkage of the members such as the valve due to high temperature or ultra low temperature, A problem may arise in the amount adjusting function or an excessive thermal stress may be generated in a member such as a valve or the like. As a result, the durability of the valve may be reduced and the stem bush and the stem may be closely contacted by the thrust.

Also, in the prior art, there is a glow valve of Registration No. 20-0246926,

[0003] In order to absorb thermal expansion generated by a high-temperature fluid when the high-temperature fluid flows, the conventional art has a seat portion having a valve port formed therein and capable of expanding and contracting in a valve direction, A bellows is provided or a fixing ring is provided at a predetermined position of the valve stem, and the bellows is inserted into an upper side of the fixing ring.

However, the above-mentioned conventional techniques are not suitable when a large load is applied, so that stability and reliability are low, and when the valve is frequently operated or used for a long time, the bellows may easily break or the bellows may be easily detached from the valve stem do.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

When a thermal expansion or contraction due to a high temperature or a very low temperature occurs in a valve that opens or closes a pipeline through which a high temperature or a cryogenic fluid flows, the stem bushing coupled with the valve stem can be lifted and lowered together with the stem via the thrust absorbing means, And a valve assembly for absorbing a thrust force generated in the screw coupling structure between the valve assembly and the valve assembly.

In order to achieve the above object, a valve assembly according to the present invention includes:

A valve assembly for opening and closing a flow path by moving an opening / closing plate provided on the stem by moving up and down a stem by an operation of an actuator,

housing;

A stem bush provided in the housing, the stem bush being rotated by an operation of the actuator;

A stem that is screwed into the stem bushing and connected to an opening / closing plate at a lower portion thereof, and moves up and down within the stem bushing when the stem bushing rotates;

Thrust absorbing means provided closely to an outer surface of the stem bushing to move the stem bushing together when the stem expands or contracts;

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When the stem expands or contracts, the stem bushing is lowered or raised together by the thrust absorbing means, so that the thrust imparted to the threaded structure between the stem and the stem bush is absorbed.

As described above, according to the present invention,

Even when thermal expansion or thermal contraction due to a high temperature or a very low temperature occurs in a valve for opening or closing a pipe through which a high-temperature or cryogenic fluid flows, even if the stem bush engaged with the valve stem is engaged with the valve stem, The stem bushing moves together with the axial displacement of the stem, thereby absorbing the thrust force by itself.

In particular, with this feature, the pressing force which may be generated in the screw coupling between the stem and the stem bush is released, so that the stem can easily move up and down in the stem bush. When the stem and the stem bush are engaged by the pressing force, It is possible to prevent a failure due to an overload,

Accordingly, even if the actuator operates at a high speed, the stem smoothly moves up and down, thereby opening and closing the flow path.

1 is a perspective view of a valve assembly according to the present invention;
2 is an exploded perspective view of a valve assembly according to the present invention.
3 is a cross-sectional view of a valve assembly according to the present invention
4 is an operational sectional view of a valve assembly according to the present invention;
Figure 5 is an exploded view of a valve assembly according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 to 3, a valve assembly A according to the present invention is a valve assembly A that opens and closes a flow path by operating an opening / closing plate by an operation of an actuator. In particular, When the stem bush 20 is rotated, the stem 40 screwed to the stem bush 20 ascends and descends to operate the opening and closing plate provided under the stem 40. For convenience of explanation, The actuator and the opening and closing plate may be omitted, and the actuator may be an automatically operated device such as a motor or a manually operated device such as a separate handle.

The core of the present invention is a structure for absorbing the thrust generated by the expansion or contraction of the stem 40 as high-temperature or ultra-low-temperature materials pass therethrough.

In general, the stem 40 and the stem bush 20 are threaded together, and when the stem 40 expands or contracts, the threaded structure, more specifically the threaded portion of the thread, There is a problem that they are not rotated due to their close contact with each other,

The same problem occurs even when rotating at a high speed, so that the actuator may fail.

That is, in order to absorb the thrust generated in the stem 40, Applicant devised the present invention,

The housing 10 includes a base 11 and a base cover 13 coupled to a lower portion of the base 11, a base housing 15 coupled to a lower portion of the base cover 13, And a spring housing 17 coupled to the spring housing 17.

The housing 10 defines a space in which the stem 40 and the stem bush 20 can be inserted in the center, and the directionality of the housing 10 is defined in the vertical direction, the lateral direction and the left direction in FIG.

First, the base 11 and the base cover 13 are used to seat a fixed stem bush 30, which will be described later, When the fixed stem bush 30 rotates, the stem bush 20 connected thereto is rotated to move the stem 40 upward and downward.

In the related art, an actuator is directly connected to the stem bush 20 and rotates. However, in order to absorb the thrust as described above, the present invention adds a new component called a fixed stem bush 30, A separate base 11 and a base cover 13 are provided.

The base 11 is provided with a third thrust bearing 31 for assisting the rotation of the fixed stem bush 30. The third thrust bearing 31 is provided on the outer surface of the fixed stem bush 30, It is obvious that the third seat portion 33 is provided so as to be closely attached thereto.

In addition, a base housing 15 is provided below the base cover 13 so that the stem bush 20, which is a core of the present invention, can be inserted.

The base housing 15 and the base cover 13 are provided with a second base coupling hole 153 and a first base coupling hole 131 and a base coupling bolt 153 passing through the respective base coupling holes 111 so as to be firmly fixed to each other.

The base housing 15 is coupled to a lower portion of the base cover 13 to form a space for allowing a stem bush 20 to be described later to be located therein, So that the stem 40 can be expanded or contracted while the stem bush 20 moves up and down in the stem bush 20.

In this regard, as described in the foregoing, the present invention includes a stem bushing 20 and a fixed stem bushing 30 interlocked with each other, and the stem bushing 20 is configured to move up and down A spline coupling portion 21 is formed on the upper portion of the stem bush 20 to spline engagement with the fixed stem bushing 30 so that the fixed bushing does not move and only the stem bushing 20 moves up and down When the fixed stem bush 30 rotates together with the upward and downward movements, the stem bush 20 can rotate together.

The spline coupling is a technique that has been frequently used in the prior art. The spline coupling is a combination in which a plurality of grooves and projections are formed in the longitudinal direction to have fluidity in the longitudinal direction and rotational forces in the vertical direction can be interlocked with each other. Omit it.

Referring again to the relationship between the base housing 15 and the stem bush 20,

A space for inserting the stem bushing 20 is formed in the base housing 15. The stem bushing 20 can be moved up and down a certain distance within the base housing 15 .

That is, when the stem bush 20 is positioned in the base housing 15 with reference to FIG. 3, a part of the surface of the stem bush 20 is not in close contact with the base cover 13 coupled to the base housing 15 When the stem bushing 20 is lifted up, the protruding portion of the outer surface of the stem bushing 20 protruding to the outside, that is, the protruding portion having the first supporting surface 25, which will be described later, Is brought into close contact with the base cover (13).

The stem bush 20 rotates in the housing 10 so that the outer surface of the stem bush 20 is in close contact with the housing 10 to prevent the rotation shaft from shaking. A portion of the upper portion is in close contact with the inner surface of the base cover 13 and the lower portion of the stem bush 20 is closely attached to the base housing 15 and the base cover 13 to prevent the rotation shaft from shaking. The lower portion of the stem bushing 20 has an effect of being closely contacted by the respective components provided between the base housing 15 and the stem bushing 20. [

A first wear ring 178a and a second wear ring 152 (strictly speaking, a first wear ring 178a and a second wear ring 178b) are respectively formed on the lower and upper surfaces of the stem bush 20 in order to facilitate rotation of the stem bush 20, Is provided on the bearing cover nut 178 and the second wear ring 152 is provided on the base housing 15).

The base housing 15 and the spring housing 17 are firmly fixed to each other by fastening bolts 179a. To this end, the spring housing 17 is provided with a first fastening hole 179, The housing 15 may be provided with a second fastening hole 157.

At this time, the fastening bolt 179a is fastened from the second fastening hole 157 in the direction of the first fastening hole 179, that is, from the upper direction to the lower direction with reference to FIG. 3, .

More specifically, referring to FIGS. 3 and 5,

Basically, since the stem bush is a consumable item, it is required to replace the stem bush at regular intervals. In order to facilitate the replacement of the stem bush, the fastening bolt 179a is fastened from the upper side to the lower side as described above.

Accordingly, when the stem bush is disassembled, the base housing 15 is opened after the fastening bolt 179a is disassembled. As a result, the internal components, that is, the stem bush and the thrust absorbing means are separated from each other So that it can be safely separated from the high elastic pressure generated by the disk spring or the elastic spring when the parts are replaced.

In addition, there is no need to release the assembled state with the valve, so that it is possible to use the valve immediately after replacement without resetting the limit / torque setting of the valve.

delete

A stem bushing nut 23 is screwed to the lower end of the stem bushing 20. When the stem bushing 20 is detached from the housing 10 to replace the stem bushing 20, The stem bushing 20 is prevented from being detached from the stem bush 20 to facilitate the replacement of the stem bush 20 and the stem bushing nut 23 is interlocked with the up and down movement of the stem bush 20, And can be rotated together with the stem bush 20.

3 and 4, the stem 40 screwed into the stem bushing 20 is omitted for simplification of the drawing.

As described above, the valve assembly A according to the present invention includes a thrust absorbing means (not shown) capable of lifting and lowering the stem bush 20 to absorb thrust generated by contraction or expansion of the stem 40, The thrust absorbing means 50 is provided between the stem bush 20 and the inner surface of the spring housing 17 and is formed in a ring shape. I will explain by reference.

The thrust absorbing means 50 is provided on the outer surface of the stem bush 20 and includes a first spring guide 53 and a pair of disc springs 57 provided on the first spring guide 53, And a second spring guide 55 provided on the disc spring 57.

A first seating portion 171 is formed under the first spring guide 53 and a first thrust bearing 173 is provided on the first seating portion 171. The second spring guide 55 is provided on the first seating portion 171, A second seating portion 175 is formed on the upper portion and a second thrust bearing 176 is further provided on the second seating portion 175.

The first thrust bearing 173 and the second thrust bearing 176 facilitate rotation of the thrust absorbing means 50. When the stem bush 20 rotates, the thrust absorbing means 50 ) May rotate together, but it may not rotate at the same rotational force, and therefore, the scope of the right should not be limited.

The first spring guide 53 is in close contact with the outer surface of the stem bush 20 and is in close contact with the outer surface of the stem bush 20, And a third support surface 533 which is spaced apart from the push portion 531 (spaced similarly to a concentric circle having a larger diameter) and which is in close contact with the upper surface of the first thrust bearing 173, .

Further, the lower surface of the first thrust bearing 173 is brought into close contact with the upper portion of the bearing cover nut 178, and the push portion 531 is in close contact with the upper surface of the stem bush nut 23.

The first spring guide 53 has an engagement protrusion 551 protruding upward from the stem bushing 20 so as to protrude from the outer surface of the stem bushing 20, A second thrust bearing 176 is provided on the outer side of the latching portion 551 and an upper surface of the second thrust bearing 176 is connected to the stem bushing 20, And the second support surface 155 provided on the base housing 15. The first support surface 25 and the second support surface 155 of the base housing 15 may be in close contact with each other.

A space is formed between the first spring guide 53 and the second spring guide 55 and a pair of disc springs 57 are provided on the mounting portion 51 so that the mounting portion 51 ), So as to realize a satellite of up-and-down movement.

Referring to FIG. 4, when the stem bush 20 moves up and down to absorb thrust due to contraction or expansion of the stem 40,

4A shows a phenomenon in which the stem bush 20 descends,

As shown, when the stem bush 20 descends, the first support surface 25 of the stem bush 20 presses down the upper surface of the second thrust bearing 176, The disk spring 57 descends to compress the disk spring 57.

4 (B) shows a phenomenon in which the stem bush 20 is lifted,

As shown in the figure, when the stem bush 20 is raised, the end of the stem bush nut 23 screwed to the lower portion of the stem bush 20 pushes the push portion 531 of the first spring guide 53 So that the disc spring 57 can be compressed.

The disk spring 57 can freely move up and down in accordance with the rising and falling of the stem bush 20 and the disk spring 57 can flexibly move up and down the stem bush 20, The position of the stem bushing 20 is changed according to the contraction and expansion of the stem 40, so that the thrust can be absorbed.

When the stem bush 20 descends as shown in FIG. 4A, the upper surface of the first thrust bearing 173 is pressed by the first support surface 25 of the stem bush 20, The first support surface 25 of the stem bush 20 is spaced apart from the first support surface 25 when the stem bush 20 is lifted as shown in FIG. 4 [B] The second support surface 155 of the first thrust bearing 15 presses the upper portion of the second thrust bearing 176,

In the case of the first thrust bearing 173, when the stem bush 20 rises as shown in FIG. 4 [B], the third support surface 533 pressing the upper portion of the first thrust bearing 173 is spaced apart This can cause problems.

Before describing the structure for solving such a problem, the thrust bearing will be described.

The thrust bearings are composed of a fixed wheel 173b having the same structure as that of the fixed wheel 173b and a rotating wheel 173a and a plurality of bearing balls 173c (Fixed to the groove) so that the fixed wheel 173b and the rotative wheel 173a can be rotated independently of each other.

In this case, however, such an operation can be performed by supporting the fixed wheel 173b and the rotatable wheel 173a in the direction of the bearing ball 173c, and the fixed wheel 173b and the rotatable wheel 173a are supported by the bearing balls 173c It is not possible to perform the role of a bearing.

Particularly, in the case where a configuration for pressing the rotatable wheel 173a is not provided as shown in FIG. 4B of the present invention, the valve assembly A according to the present invention is capable of maintaining a vertical The bearing ball 173c of the first thrust bearing 173 and the rotatable wheel 173a may be spaced apart from each other by a slight gap, (In the case of the second thrust bearing 176, this problem is not caused by having the structure for pressing the upper and lower portions, respectively, as mentioned above.)

Accordingly, the present invention further includes an elastic spring 177a for pressing the upper surface of the rotatable wheel 173a.

More specifically, the elastic spring 177a is provided in a spacing space (spring seating portion 177) between the push portion 531 and the second support surface 155 of the first spring guide 53, The lower end of the elastic spring 177a is connected to the upper surface of the first thrust bearing 173, that is, the upper surface of the rotating wheel 173a So that it can be brought into close contact with the surface.

Even if the stem bush 20 rises and the third support surface 533 of the first spring guide 53 is separated from the wheel 173a by the elastic force of the elastic spring 177a, 173a can be pressed to solve the above-mentioned problems.

The stem bush 20 is excessively raised or lowered so that the distance of the mounting portion 51 of the disc spring 57 is smaller than the thickness of the disc spring 57 to damage the disc spring 57 A stopping member 59 capable of interpolating the disk spring 57 is provided on the mounting portion 51. The minimum distance of the mounting portion 51 is set by the stopping member 59 So as to improve durability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it should be understood that various changes, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Substitutions should be construed as falling within the scope of protection of the present invention.

A: valve assembly 10: housing
11: base 111: base coupling bolt
13: Base cover
131: first base coupling hole 15: base housing
151: space portion 152: second wear ring
153: second base coupling hole 155: second support surface
157: second fastening hole 17: spring housing
171: first seat portion 173: first thrust bearing
173a: rotating wheel 173b: fixed wheel
173c: bearing ball 175: second seat portion
176: second thrust bearing 177: spring seat portion
177a: Elastic spring 178: Bearing cover nut
178a: first wearing ring 179: first fastening hole
179a: fastening bolt 20: stem bush
21: Spline coupling portion 23: Stem Bushing nut
25: first supporting surface 27: engaging surface
30: Fixed stem bushing 31: Third thrust bearing
33: third seat part 40: stem
50: Thrust absorbing means 51:
53: first spring guide 531: push portion
533: third supporting surface 55: second spring guide
551: Retaining part 57: Disk spring
59: Stopping member

Claims (4)

A valve assembly for opening and closing a flow path by moving an opening / closing plate provided on the stem by moving up and down a stem by an operation of an actuator,
A housing (10);
A stem bushing 20 provided in the housing 10 and rotated by the operation of the actuator;
A fixed stem bush 30 coupled to the stem bush 20 and connected to the actuator;
A stem 40 which is screwed into the stem bush 20 and is connected to an opening and closing plate at a lower portion thereof and moves up and down in the stem bushing 20 when the stem bushing 20 is rotated;
Thrust absorbing means 50 provided on the outer surface of the stem bushing 20 to move the stem bushing 20 together when the stem 40 expands or contracts;
, ≪ / RTI >

When the stem 40 expands or contracts, the stem bush 20 descends or rises together with the thrust absorbing means 50 so that the thrust imparted to the threaded structure between the stem 40 and the stem bush 20 Absorbed,
The stem bushing (23) is screwed under the stem bush (20) to prevent the thrust absorbing means (50) from coming off,
When the stem bush 20 is separated from the housing 10, the thrust absorbing means 50 provided on the outer surface of the stem bush 20 is integrally separated together with the stem bush 20. Valve assembly. The method according to claim 1,
The thrust absorbing means (50)
First and second spring guides 53 and 55 provided on the outer surface of the stem bush 20 and a disc spring 57 provided between the first and second spring guides 53 and 55, ≪ / RTI >
When the stem 40 contracts or expands, the stem bush 20 moves up or down to raise the first spring guide 53 or lower the second spring guide 55 to compress the disc spring The valve assembly comprising: 3. The method of claim 2,
Between the first spring guide 53 and the second spring guide 55,
Wherein a stopping member (59) is provided to limit a rise or a fall height of the first spring guide (53) and the second spring guide (55) to prevent breakage of the disc spring (57). The method according to claim 2 or 3,
In the housing 10
A plurality of bearing balls 173c provided between the rotating wheel 173a and the fixed wheel 173b and a plurality of bearing balls 173c provided between the rotating wheel 173a and the fixed wheel 173b to induce rotation of the stem bush 20, A thrust bearing 173 is provided,
An elastic spring 177a for pressing the rotating wheel 173a of the first thrust bearing 173 to prevent the rotating wheel 173a or the fixed wheel 173b or all of them from being separated from the bearing ball 173c, The valve assembly further comprising:

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