KR20200076530A - Plug for fluid blocking - Google Patents

Abstract

According to various embodiments of the present invention, a plug for blocking a fluid is coupled to a fluid hole formed in a hydraulic machine and comprises: a head unit having a predetermined diameter and having a thread unit formed on the circumference thereof; and a sealing unit extending from the lower end of the head unit and having at least a portion pressed on the inner circumferential surface of the fluid hole. The sealing unit can comprise: a first sealing unit disposed to form a predetermined angle with respect to a flat surface perpendicular to a central axis of the head unit; and a second sealing unit disposed between the first sealing unit and the head unit.

Description

Plug for fluid blocking {PLUG FOR FLUID BLOCKING}

The present invention relates to a plug for plugging a fluid, and more particularly, to a plug for plugging a fluid for preventing fluid leakage from a hydraulic device.

Most devices or devices that use fluid force have a structure for storing fluid inside the device.

In general, a hydraulic device or machine using a high hydraulic pressure is provided with a stopper for blocking a hole for inducing a processed fluid to prevent the internal fluid from being exposed to the outside.

However, in the case of a screw-type stopper, thrustload is generated in the part by the fastening torque transmitted to the screw thread, and there is a structural limit to the fastening torque increase for greater airtightness. In addition, there is a problem in that the airtight performance varies depending on the machining precision of the thread.

Registered Patent No. 10-0783547 (2007.12.03)

The present invention has been made to solve the above problems, and an object thereof is to provide a plug for blocking fluid to prevent leakage of a hydraulic device.

A plug for blocking fluid according to various embodiments of the present invention includes: a plug for blocking fluid coupled to a fluid hole formed in a hydraulic device, the head portion having a constant diameter and forming a threaded portion around the plug; And a sealing portion extending from a lower end of the head portion and being at least partially pressed against an inner circumferential surface of the fluid hole, wherein the sealing portion includes a first sealing portion and the first portion disposed to form a constant angle with respect to a plane perpendicular to the central axis of the head portion. It may include a second sealing portion disposed between the one sealing portion and the head portion.

Preferably, the angle formed by the second sealing portion with respect to a plane perpendicular to the central axis of the head portion may be less than or equal to an angle formed by the first sealing portion with respect to a plane perpendicular to the central axis of the head portion.

Preferably, it may include a coating member applied to the screw portion of the head.

Preferably, the sealing portion may include a concave portion that is concavely formed upward from the center portion of the bottom surface.

Preferably, the head portion includes a tool engaging groove portion, the tool engaging groove portion is formed in a substantially star shape in which a cross section includes six corner portions, and the six corner portions may be formed to be rounded, respectively.

Preferably, the fluid hole includes an inner threaded portion that is screwed with the head portion, and a press portion formed on a lower end portion of the inner threaded portion and having an inner peripheral surface of upper and lower negotiating portions, and the head portion along a thread formed in the inner threaded portion. As the tightening, the first sealing portion and the second sealing portion are respectively pressed against the inner circumferential surface of the pressing portion to seal the fluid hole.

Hydraulic device sealing structure according to various embodiments of the present invention, in the hydraulic device sealing structure including the plug for blocking the fluid according to claims 1 to 6, the angle formed by the pressure contact portion with the central axis is the first slope The portion and the second inclined portion may be formed smaller than the angle formed with the central axis, respectively.

The plug for blocking fluid according to various embodiments of the present invention may increase a sealing effect through the first sealing portion and the second sealing portion.

In addition, by providing a thread on the head portion, the sealing effect may be increased as the fastening force through the head portion increases.

In addition, as the diameter of the head portion and the diameter of the sealing portion are formed substantially similar, there is an effect that the depth of the engaging tool groove portion can be deeply formed.

1 is a view showing a plug for blocking fluid according to various embodiments of the present invention.
Figure 2 is a view showing a tool engagement groove portion of the plug for plugging fluid according to various embodiments of the present invention.
3 is a view showing a sealing portion of a plug for blocking fluid according to various embodiments of the present invention.
4 is a view conceptually showing a fluid hole coupled to a plug for blocking fluid according to various embodiments of the present invention.

Hereinafter, for convenience of description, some embodiments of the present invention will be described through exemplary drawings. In describing reference numerals in the components of each drawing, the same components are denoted by the same reference numerals as much as possible even though they are displayed in different drawings.

The terms or words used in the specification and claims should not be limited to ordinary or dictionary meanings, and the inventor can properly define the concept of terms in order to best describe his or her invention. It should be interpreted as meanings and concepts consistent with the technical spirit of the present invention based on the. In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being'connected' or'coupled' to another component, the component may be directly connected or coupled to the other component, but another component between the component and the other component It should be understood that the elements may be'connected' or'coupled'.

Therefore, the embodiments shown in the embodiments and the drawings shown in this specification are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, and various equivalents can be substituted at the time of this application. It should be understood that there may be water and variations. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

Hereinafter, the direction in which the tool is inserted into the head portion 100 may be described as an upward or upward direction, and an opposite direction, that is, a direction toward the inside of the fluid hole 301 may be described downward or downward.

Hereinafter, a plug for blocking fluid according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a plug for plugging a fluid according to various embodiments of the present invention, Figure 2 is a view showing a tool coupling groove 150 of a plug for plugging fluid according to various embodiments of the present invention, 3 is a view showing a sealing portion of a plug for blocking fluid according to various embodiments of the present invention, and FIG. 4 is a conceptual view showing a fluid hole 301 coupled to a plug for blocking fluid according to various embodiments of the present invention It is a drawing.

The plug for blocking fluid according to various embodiments of the present invention is a hole (fluid hole 301) that is opened to the inside or outside of the fluid device 300 in the flow path of the fluid (oil or gas) formed in the fluid device 300. ) To seal. Applicable to most equipment or machinery fields that use fluid power, and is used as a blocking stopper used to block holes for fluid induction processed externally in a hydraulic device (300) or machine using high hydraulic power. It is applicable to the field of mechanical element technology that prevents the fluid from being exposed to the outside.

1 to 4, the plug for blocking fluid according to various embodiments of the present disclosure may include a head unit 100 and a sealing unit 200. The plug for blocking fluid may include a head portion 100 and a sealing portion, and may be formed to extend in a constant length in the axial direction (up and down direction). In one embodiment, the axial length (L) of the plug for blocking fluid is obtained by dividing the axial length (L) of the plug for blocking fluid by the nominal diameter (M) of the threaded portion of the head (100). When the dimensionless value of the direction length L is 0.1 to 1.0, the dimensionless value may be formed by adding the axial length L1 of the sealing portion to be described later.

The head part 100 forms a predetermined area at the upper end of the plug for blocking fluid. A thread portion 110 may be formed around the head portion 100. The screw portion 110 formed on the head portion 100 may include a male screw. The thread portion 110 of the head portion 100 may be screwed with the inner thread portion 310 of the fluid hole 301. The head portion 100 may have a cylindrical shape having a constant diameter (M).

A coating member (not shown) may be applied to the screw 110. Through this coating member, additional sealing effects may be imparted together with the first sealing parts 210 and 220 and the second sealing parts 230 and 240. The coating member may include an ethylene glycol dimethacrylate (EGDMA) material, but is not limited thereto.

A tool engaging groove 150 formed concave downward may be disposed on an upper surface of the head unit 100. A tool can be inserted into the tool engaging groove 150, and by tightening the tool with a predetermined torque, a fastening force for screwing between the threaded portion 110 of the head portion 100 and the inner threaded portion 310 of the fluid hole 301 Can be given.

Referring to FIG. 2, the cross section of the tool engaging groove 150 may be formed in a substantially star shape with six corners 151. This is to minimize the surface pressure when tightening the tool. At this time, each corner portion 151 may be formed to be rounded with a constant radius of curvature R2, and between each edge portion 151, a valley 152 formed to be rounded with a constant radius of curvature R1 may be disposed. Can.

In one embodiment, the distance A1 between the corner portions 151 that are symmetrical to each other is obtained by dividing the distance A1 between the corner portions 151 that are symmetrical to each other by the nominal diameter M of the threaded portion, which are symmetrical to each other. It may be formed so that the dimensionless value of the distance A1 between (151) is 0.15 to 0.96.

If the distance (A1) value between the corners 151 is less than 0.15, it is difficult for the plug to maintain a fastening torque for maintaining sufficient airtight performance, and if it exceeds 0.96, there is a problem that smooth tool joining is difficult.

At this time, the distance A2 between the symmetrical valleys 152 is the distance between the symmetrical valleys 152 obtained by dividing the distance A2 between the symmetrical valleys 152 by the A1 value calculated above. It may be formed so that the dimensionless value of (A2) is 0.21 to 1.2.

In addition, the depth H of the tool engaging groove 150 is a dimensionless value of the depth H of the tool engaging groove 150 obtained by dividing the depth H of the tool engaging groove 150 by the A1 value is 0.15. It may be formed to be 1.5.

In addition, as for the radius of curvature R1 of the bone 152, the dimensionless value of the radius of curvature R1 of the bone 152 obtained by dividing the radius of curvature R1 of the bone 152 by the A1 value is 0.10 to 0.31. It can be formed to be, the radius of curvature (R2) of the corner portion 151, the radius of curvature (R2) of the corner portion 151 obtained by dividing the radius of curvature (R2) of the corner portion 151 by the A1 value It may be formed to have a dimensionless value of 0.01 to 0.2.

That is, in the present invention, the tool engaging groove portion 150 formed in the head portion 100 is generally formed in a star shape, and the depth H and the longest distance (distance between the edge portions 151, A1) By setting the radius of curvature (R1, R2) of the shape, the maximum tightening torque can be limited, and the surface pressure when tightening the tool can be minimized.

As the screw portion 110 of the head portion 100 is tightened to the inner screw portion 310 of the fluid hole 301 by a tool, the first sealing portion and the second sealing portion are pressed against the fluid hole 301 as will be described later. It can be compressed to the part 330 to induce plastic deformation or mutual contact, and according to such deformation, at least a surface contact or a line contact may be formed between the first sealing part and the second sealing part and the inner circumferential surface of the pressing part 330. Can.

Referring to FIG. 3, a plug for blocking a fluid according to various embodiments of the present disclosure may include a sealing part 200. The sealing part 200 may be formed to extend downward from the lower end part of the head part 100. The sealing portion may be disposed coaxially with the head portion 100. The sealing part 200 may be generally formed in a shape of an upper and lower tube. The sealing part 200 may include a buffer part 260, first sealing parts 210 and 220 and second sealing parts 230 and 240. The first sealing portions 210 and 220 and the second sealing portions 230 and 240 are compressed to the pressing portion 330 of the fluid hole 301 as the head portion 100 is tightened by a tool, so that plastic deformation or contact may occur. have. In one embodiment, the axial length L1 of the sealing portion 200 is obtained by dividing the axial length L1 of the sealing portion 200 by the nominal diameter M of the threaded portion 110 of the head portion 100 It may be formed so that the dimensionless value of the axial length L1 of 200 is 0.1 to 0.9.

The buffer unit 260 may be formed to extend to a certain length from the lower end of the head unit 100. The buffer unit 260 may have a cylindrical shape with a constant diameter. The diameter D of the buffer portion 260 may be formed smaller than the nominal diameter M of the threaded portion 110 of the head portion 100. In one embodiment, the diameter D of the buffer portion 260 is obtained by dividing the diameter D of the buffer portion 260 by the nominal diameter M of the threaded portion 110 of the head portion 100 (D) may be formed so that the dimensionless value of 0.5 to 0.9. The second sealing parts 230 and 240 may be extended below the buffer part 260.

The second sealing parts 230 and 240 may include a second inclined part 240 and a second sealing surface 230. The second inclined portion 240 may be formed to be inclined toward a radially inner side as it goes down. That is, the diameters of the upper ends of the second sealing parts 230 and 240 correspond to the diameters of the buffer parts 260, and may be formed in a shape of an upper and lower nymph as it goes downward. In this case, the side surfaces of the second sealing portions 230 and 240 may be described as the second inclined portion 240.

The second inclined portion 240 may be formed to be inclined by a predetermined angle θ4 with respect to the central axis CL. This is to allow the second sealing portion to contact the pressing portion 330. In one embodiment, the second inclined portion 240 may be formed to be inclined by approximately 15 degrees with respect to the central axis.

The second sealing parts 230 and 240 may include a second sealing surface 230. The second sealing surface 230 may mean a lower surface of the second sealing parts 230 and 240. The second sealing surface 230 may be formed to be inclined by a predetermined angle θ2 with respect to a plane perpendicular to the central axis CL. This is because the amount of plastic deformation or the line contact timing of the second sealing portions 230 and 240 can be adjusted when the second sealing portions 230 and 240 for maintaining airtight performance contact the pressing portion 330.

Also, an angle θ2 formed by the second sealing surface 230 with a plane perpendicular to the central axis CL is greater than an angle θ1 formed with the plane perpendicular to the central axis CL by the first sealing surface 210. It may be formed to be smaller or equal.

In one embodiment, the second sealing surface 230 may be inclined to form an angle of 5 to 25 degrees with respect to a plane perpendicular to the central axis CL. If the inclined angle θ2 is less than 5 degrees or exceeds 25 degrees, the hermetic performance may be deteriorated due to problems of the plastic deformation amount and the contact timing of the second sealing parts 230 and 240.

When the second sealing portions 230 and 240 are compressed to the pressing portion 330 of the fluid hole 301, at least a portion of the second sealing surface 230 and/or the second inclined portion 240 is plastically deformed, The contact portion 330 may be in surface contact or line contact. The first sealing portions 210 and 220 may be extended below the second sealing portions 230 and 240.

The first sealing parts 210 and 220 may include a first inclined part 220 and a first sealing surface 210. The first inclined portion 220 may be formed to be inclined toward a radially inner side as it goes down. The diameters of the upper end portions of the first sealing portions 210 and 220 are smaller than the diameters of the lower end portions of the second sealing portions, and may be formed in a shape of an upper and lower angular narrowing toward the bottom. In this case, the side surfaces of the first sealing portions 210 and 220 may be described as the first inclined portion 220.

The first inclined portion 220 may be formed to be inclined by a predetermined angle with respect to the central axis CL. This is because the initial contact timing of the first sealing units 210 and 220 can be adjusted according to the timing of the initial contact of the second sealing units 230 and 240 with the pressing portion 330. In one embodiment, the first inclined portion 220 may be formed to be inclined by approximately 18 degrees with respect to the central axis.

The first sealing parts 210 and 220 may include a first sealing surface 210. The first sealing surface 210 may mean a lower surface of the first sealing portion. The first sealing surface 210 may be formed to be inclined by a predetermined angle θ1 with respect to a plane perpendicular to the central axis CL. This is because the plastic deformation amount and the line contact timing can be adjusted when the first sealing parts 210 and 220 contact the pressing part 330.

In addition, an angle θ1 formed by the first sealing surface 210 with a plane perpendicular to the central axis CL is greater than an angle θ2 formed with the plane perpendicular to the central axis CL by the second sealing surface 230. It may be formed to be greater than or equal to. This is because the first and second sealing portions can adjust a certain amount of deformation or the timing of line contact in order to maintain the same airtight performance.

In one embodiment, the first sealing surface 210 may be inclined to form an angle of 5 to 25 degrees with respect to a plane perpendicular to the central axis CL. If the inclined angle θ1 is less than 5 degrees or exceeds 25 degrees, a problem in maintaining airtight performance may occur due to a plastic deformation amount of the first sealing units 210 and 220 or a contact timing problem.

In addition, in one embodiment, the axial length (L2) of the first sealing portion (210,220), the axial length (L2) of the first sealing portion (210,220) as the threaded part diameter (M) of the head portion 100 It may be formed so that the dimensionless value of the axial length L2 of the first sealing portions 210 and 220 obtained by dividing is 0.05 to 0.3.

In one embodiment, the upper end diameter d2 of the first inclined portion 220 is obtained by dividing the upper end diameter d2 of the first inclined portion 220 by the nominal diameter M of the threaded portion of the head portion 100 It may be formed so that the dimensionless value of the diameter d2 of the upper end of the inclined portion 220 is 0.16 to 0.98.

In addition, in one embodiment, the diameter (d1) of the lower end portion of the first inclined portion 220, the second inclined portion 240 and the edge F of the second sealing surface 230 and the first inclined portion 220 And the virtual line connecting the edge (E) of the first sealing surface 210 may be formed so that the angle formed with the plane perpendicular to the center line (CL) is 30 to 90 degrees. This is the same angle or a different angle from the pressing portion 330, such that the first and second sealing portions are in contact at the same time, or the plastic deformation amount ratio of the first and second sealing portions is 5:5 or 6:4, 7:3, for example. Because it is mutable.

When the first sealing portions 210 and 220 are compressed to the pressing portion 330 of the fluid hole 301, at least a portion of the first sealing surface 210 and/or the first inclined portion 220 is plastically deformed, It may be in surface contact with the pressing portion 330.

According to various embodiments, the sealing portion 200 may include a concave portion 250 that is concavely formed upward from the center portion of the bottom surface. As the hydraulic pressure acting upward presses the inner circumferential surface of the concave portion 250, the first sealing portion and/or the second sealing portion may be pressed outward in the radial direction by the hydraulic pressure. Therefore, it is possible to increase the sealing efficiency of the sealing portion by hydraulic pressure even if no additional fastening force is applied.

Referring to FIG. 1, in one embodiment, the concave portion 250 may be formed to have a V-shaped cross-section, but is not limited thereto, and the cross-section may be formed in a U-shape or a hemispherical shape as shown in FIG. 3.

The plug for blocking fluid according to various embodiments of the present invention described above may be inserted into the fluid hole 301 formed in the hydraulic device 300 to seal the fluid hole 301.

Referring to FIG. 4, the fluid hole 301 may include an inner screw part 310 for screwing with a screw part of the head part 100 of the plug for blocking fluid. A female screw portion corresponding to the thread portion 110 of the head portion 100 may be formed on the inner circumferential surface of the inner thread portion 310. In one embodiment, the axial length L3 of the inner threaded portion 310 is obtained by dividing the axial length L3 of the inner threaded portion 310 by the nominal diameter M of the threaded portion 110 of the head portion 100. It may be formed so that the dimensionless value of the axial length L3 of the screw 310 is 0.3 to 1.25. This is because the plug for fluid blocking can induce sufficient clamping force and prevent interference between fasteners when fastening to the fluid hole.

In addition, the lower end of the inner threaded portion 310 may be disposed with a press portion 330 formed in the shape of an upper and lower canal that decreases in diameter as it goes down. As the head portion 100 is tightened by a tool, the first sealing portions 210 and 220 and the second sealing portions 230 and 240 of the above-described sealing portion 200 may be compressed to the pressing portion 330. As the first sealing portions 210 and 220 and the second sealing portions 230 and 240 are plastically deformed, the sealing effect can be provided by making surface contact or line contact with at least a portion of the pressing portion. In one embodiment, the angle formed by the pressing portion with the central axis may be formed to be smaller than or equal to the first and second slopes. In one embodiment, the angle θ5 of the inner circumferential surface of the pressing part 330 may be formed to be inclined by approximately 25 degrees to 95 degrees with respect to a plane perpendicular to the central axis CL. This is because the plastic deformation amount ratio of the first and second sealing portions and the contact timing can be changed by the respective angle adjustment.

As described above, the head portion 100 of the plug for blocking fluid according to various embodiments of the present invention may be tightened with respect to the inner threaded portion 310 of the fluid hole 301 by a tool.

As the threaded portion of the head portion 100 is screw-defected with the inner threaded portion 310, the lower portion of the sealing portion 200 may be moved downward. And, as it is tightened by the tool, at least a portion of the first sealing parts 210 and 220 and the second sealing parts 230 and 240 may be compressed to the pressing part 330. When the force to be compressed exceeds a certain amount, at least a portion of the first sealing portions 210 and 220 and the second sealing portions 230 and 240 may cause plastic deformation, and the inner surface of the portion and the contact portion 330 that caused the plastic deformation. This can be contacted.

In the present invention, the first sealing portions 210 and 220 are provided at a portion closest to the fluid, so that the first sealing portions 210 and 220 can be primarily sealed through plastic deformation. In addition, by providing the second sealing portions 230 and 240 above the first sealing portions 210 and 220, the sealing effect may be secondarily provided through plastic deformation of the second sealing portions 230 and 240. In addition, by applying a coating member to the threaded portion 110 of the head portion 100 disposed on the upper side of the sealing portion, the fluid leaked through the first sealing portions 210 and 220 and the second sealing portions 230 and 240 can be finally sealed. It is.

In addition, in the present invention, the pressure of the fluid directly presses the inner circumferential surface of the concave portion 250 by providing the concave portion 250 at the lower end of the first sealing portions 210 and 220, whereby the first sealing portions 210 and 220 or the second It is possible to provide a pressing force radially outwardly to the sealing portions 230 and 240.

In addition, since the threaded portion on which the fastening force acts upon the tightening of the tool is disposed on the head portion 100, there is no fear of breakage because the tensile force is not generated between the head portion 100 and the sealing portion even if the fastening force is continuously increased.

That is, since not only the torque generated by the tightening of the tool, but also the additional pressing force by the hydraulic pressure can act on the first and/or second sealing portion, there is an effect of increasing the sealing effect.

In the above, even if all the components constituting the embodiments of the present invention are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the constituent elements may be selectively combined and operated. In addition, the terms'include','consist' or'have' as described above means that the corresponding component can be intrinsic, unless specifically stated otherwise, to exclude other components. It should not be interpreted as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted as being consistent with the contextual meaning of the related art, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

100: head
110: thread
150: tool engaging groove
151: corner
152: bone
200: sealing portion
260: buffer unit
220: first slope
210: first sealing surface
240: second slope
230: second sealing surface
250: recess
300: hydraulic equipment
301: fluid hole
310: inner thread
330: pressure contact

Claims (7)

In the plug for blocking fluid coupled to the fluid hole formed in the hydraulic device,
A head portion having a constant diameter and having a threaded portion around it; And
It includes a sealing portion extending from the lower end of the head portion and at least a portion pressed against the inner peripheral surface of the fluid hole,
The sealing portion is a plug for blocking fluid, comprising a first sealing portion disposed to form a constant angle with respect to a plane perpendicular to the central axis of the head portion and a second sealing portion disposed between the first sealing portion and the head portion.
According to claim 1,
The angle formed by the second sealing portion with respect to a plane perpendicular to the central axis of the head portion is less than or equal to an angle formed by the first sealing portion with respect to a plane perpendicular to the central axis of the head portion.
According to claim 1,
Plug for blocking fluid, including a coating member applied to the screw portion of the head.
According to claim 1,
The sealing portion plug for blocking fluid, including a concave portion formed concave upward from the center portion of the lower surface.
According to claim 1,
The head portion includes a tool engaging groove portion,
The tool engaging groove portion is formed in a substantially star shape having a cross section of six corners, the plug for blocking the fluid is formed to round each of the six corners.
According to claim 1,
The fluid hole includes an inner threaded portion that is screwed with the head portion, and a press portion formed on a lower end portion of the threaded portion and having an inner circumferential surface of an upper and lower tube,
As the head portion is tightened along a thread formed in the inner threaded portion, the first sealing portion and the second sealing portion are respectively pressed against the inner circumferential surface of the pressing portion to seal the fluid hole.
In the hydraulic device sealing structure comprising the plug for blocking the fluid according to claim 1 to claim 6,
The angle formed by the press-contact portion with the central axis is smaller than the angle formed by the first slope and the second slope with the central axis, respectively.

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