KR102161551B1 - Grip ring and nut assembly for fixing pipe to prevent O-ring damage - Google Patents

Abstract

The present invention relates to an assembly including a grip ring used for fixing a pipe, a nut on which the grip ring is mounted on the inside, a clamp ring, a washer, and an O-ring located on the inside of the nut, wherein the grip ring is a material that can be deformed. A ring member comprising a ring member, a locking portion formed on the outer surface of the ring member so that when the ring member is inserted into the nut from the bottom to the top, it is caught on the inside of the nut to limit its separation from the bottom, and the ring member extends upwardly And, the ring member is inserted into the inside of the nut and when compressed, a gripping portion for gripping the pipe, and a pressing protrusion formed on the inner surface of the gripping portion and pressing so that the bottleneck portion is formed in the pipe when the gripping portion is gripped, Includes a plurality of contact ribs discontinuously formed along the inner circumferential surface of the pressure protrusion so as to be in close contact with the outer circumferential surface of the pipe, and the nut limits the insertion depth of the ring member by seating the body on which the female thread is formed and the ring member A seating portion formed on the inner surface of the body so as to be caught, a locking protrusion formed on the lower side of the seating portion to restrict the ring member from being removed downward by being caught in the locking portion, and the body to guide the gripping portion to be compressed to grip the pipe. And a grip ring for fixing the pipe to prevent damage to the O-ring including a compression guide portion formed to be inclined on the inner surface of the body, and a deformation limiting jaw formed on the upper side of the compression guide portion in the body so that the gripping portion restricts deformation during compression. It relates to the assembly of the nut.

Description

Grip ring and nut assembly for fixing pipe to prevent O-ring damage

The present invention relates to an assembly of a grip ring and a nut for fixing pipes, and more particularly, to prevent damage to O-rings during compression, and to prevent damage to O-rings with excellent sealing ability and durability by uniform compression of the O-rings. It relates to the assembly of the grip ring and nut.

In general, pipes are widely used to transport a fluid such as water or oil or a gas such as gas, and these pipes are manufactured and sold in a certain size (length) due to transport or handling restrictions. Therefore, when constructing a section longer than the standard length of the pipe or constructing a bent section, a pipe connecting device must be used or the pipes must be connected and welded together.

The piping connection device is a device for connecting pipes used for piping, and there are various types. In particular, a piping connection device with a structure that prevents the pipe inserted in the connector from escaping by using a grip ring is connected. It is widely used for piping work due to its ease of operation.

As a prior art for such a pipe connection device, the applicant of the present invention has proposed "Assembly of a pipe fixing grip ring and a nut" in Korean Patent No. 10-1393395, which is a grip ring used for fixing a pipe and In the assembly consisting of a nut to which the grip ring is mounted inside, the grip ring has a ring shape for being inserted into the pipe, and the ring member is made of a deformable material; A locking portion formed on an outer surface of the ring member so that when the ring member is inserted into the nut from below to an upper side, it is caught on the inside of the nut, thereby restricting its separation from the bottom side; A gripping portion extending upwardly to the ring member and compressed to grip the pipe when the ring member is inserted into the nut and compressed; And a pressing protrusion formed on an inner surface of the gripping part and for pressing the bottle neck part on the pipe when the gripping part grips the pipe, wherein the nut includes a body having a female thread part formed on the inner circumferential surface; A seating portion formed on an inner surface of the body to limit the insertion depth of the ring member by seating the ring member; A locking protrusion formed on a lower side of the seating portion to limit the ring member from being separated downward by being caught on the locking portion; A compression guide portion formed to be inclined to an inner surface of the body to guide the gripping portion to be compressed to grip the pipe; And a deformation limiting jaw formed on the upper side of the compression guide part in the body so that the gripping part restricts deformation during compression.

In this prior art, the grip ring further includes a contact rib extending to the other side of the ring member so as to be in close contact with the outer circumferential surface of the pipe, and having a plurality of expansion guide grooves formed along the circumference to guide the expansion and contraction.

However, there is a need to improve such a conventional technology in the following points.

First, the grip ring is formed so that the contact rib is in contact with the O-ring, so when it is compressed due to use, the contact rib penetrates into the O-ring and causes damage to the O-ring, which causes uneven compression of the O-ring, making it difficult to improve airtightness. In addition, there was a problem of causing a leak through the damaged part of the O-ring. This problem makes it difficult to restore the shape of the O-ring damaged by the contact rib in the heat resistance test of the product, resulting in a serious problem that cannot guarantee the reliability of the product.

Second, as the tight ribs are continuously formed along the inner circumferential surface of the grip ring, it causes great interference with the O-ring during compression, and even pushes the O-ring to separate it from the pipe, thereby obstructing the airtight connection of the pipe. Provided the cause.

Third, due to the formation of the kit catching part in the nut, the female screw part is not continuously formed to the end, thereby making it difficult to smooth screw fastening with the pipe member, causing inconvenience, and further, limiting the improvement in screwing force with the pipe member. Eggplant had a problem.

Fourth, during compression due to screwing of the pipe member to the nut, reinforcement was required for the end where stress is concentrated in the nut.

In order to solve the problems of the prior art as described above, the present invention prevents the contact rib from digging into the O-ring and causing damage when the contact rib is formed on the upper inner circumferential surface of the grip ring. It prevents leakage due to, and ensures the reliability of the product by smoothly restoring the shape of the O-ring in the heat-resistance test. In the grip ring, a number of contact ribs are formed discontinuously so that they are spaced apart from each other along the upper inner circumferential surface. It helps to compress the pipe by helping to compress the pipe while increasing the fixation power to the pipe by making it easy to deform during the time of deformation, and to make the O-ring adhere to the grip ring through a washer rather than directly. This uniform compression improves and maintains airtightness, and as the female thread of the nut extends to the insertion side of the pipe member, it is easy to manufacture the nut, and the screwing force of the nut is excellent, and compression by screwing the pipe member from the nut The purpose is to increase durability by reinforcing the tip where stress is concentrated.

Other objects of the present invention will be easily understood through the description of the following embodiments.

In order to achieve the object as described above, according to an aspect of the present invention, a grip ring used for fixing a pipe, a nut on which the grip ring is mounted inside, and a clamp that suppresses the pipe from being separated from the nut In an assembly comprising a ring, a washer and an O-ring installed between the clamp ring and the grip ring, wherein the grip ring has a ring shape for insertion into the pipe and is made of a deformable material, When the ring member is inserted from the bottom to the top of the nut, a locking portion formed on the outer surface of the ring member so as to be locked to the inner side of the nut so as to limit separation downward, and a locking portion formed on the outer surface of the ring member extending upwardly, and , When the ring member is inserted into the nut and compressed, a gripping portion compressed to grip the pipe, and a gripping portion formed on an inner surface of the gripping portion, and when the gripping portion grips the pipe, the pipe And a pressing protrusion for pressing the bottleneck portion to be formed on the pipe, and a plurality of contact ribs discontinuously formed at intervals along one side of the pressing protrusion so as to be in close contact with the outer circumferential surface of the pipe, and the nut has a female threaded portion formed on the inner circumferential surface. A body and a seating portion formed on the inner surface of the body to limit the insertion depth of the ring member by seating the ring member, and a lower side of the seating portion to limit the disengagement of the ring member downward by being caught by the locking portion And a compression guide portion formed to be inclined to an inner surface of the body to guide the gripping portion to be compressed to grip the pipe, and the body to limit deformation when the gripping portion is compressed. In the assembly of a grip ring and a nut for fixing a pipe to prevent damage to the O-ring, including a deformation limiting jaw formed on the upper side of the compression guide part is provided.

The O-ring is inserted into the outer side of the pipe so as to be located on the opposite side of the contact rib in the grip ring, and consists of at least one, and the washer is between the grip ring and the O-ring, and between the O-ring and the clamp ring It can be inserted into the outside of the pipe so as to be respectively located in.

The grip ring, when compressed by the compression guide portion of the nut, may be formed such that the amount of pressing of the pipe by the pressing protrusion falls within a range of 0.36 to 0.48 mm.

The nut may be formed such that a female screw portion for screwing with the pipe member extends to a side into which the pipe member is inserted.

The nut may have a facing surface formed on a side facing the outer surface of the pipe in contact with the deformation limiting jaw to form a surface facing the pipe.

According to the assembly of the pipe fixing grip ring and the nut to prevent damage to the O-ring according to the present invention, the contact rib is formed on the inner circumferential surface of the upper end of the grip ring, so that when pressing due to use, the contact rib penetrates the O-ring and causes damage. By preventing, it is possible to prevent leakage due to O-ring damage, and to ensure product reliability by smoothly restoring the shape of the O-ring in the heat resistance test, and the tight ribs in the grip ring are separated from each other along the upper inner circumferential surface. By forming as many discontinuities as possible, it is possible to easily deform when crimping, thereby minimizing interference with other members, and increasing the fixing force to the pipe by helping the crimping of the pipe, and the O-ring does not directly adhere to the grip ring. It is possible to improve and maintain excellent airtightness by uniformly compressing the O-ring during compression, and the female thread of the nut extends to the insertion side of the pipe member, making it easy to manufacture the nut and The screw fastening force can be made excellent, and durability can be improved by reinforcing the tip of the nut where stress is concentrated during compression by screwing of the pipe member.

1 is a side cross-sectional view showing an assembly of a pipe fixing grip ring and a nut to prevent damage to an O-ring according to an embodiment of the present invention.
2 is a side cross-sectional view showing a grip ring in an assembly of a pipe fixing grip ring and a nut to prevent damage to an O-ring according to an embodiment of the present invention.
3 is a plan view showing a grip ring in an assembly of a pipe fixing grip ring and a nut to prevent damage to an O-ring according to an embodiment of the present invention.
4 is a side cross-sectional view illustrating a nut in an assembly of a grip ring for fixing a pipe and a nut to prevent damage to an O-ring according to an embodiment of the present invention.
5 and 6 are side cross-sectional views for sequentially explaining the use of an assembly of a pipe fixing grip ring and a nut to prevent damage to an O-ring according to an embodiment of the present invention.

In the present invention, various changes may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, and should be understood in a way that includes all changes, equivalents, or substitutes included in the technical spirit and scope of the present invention, and may be modified in various other forms. It can be, and the scope of the present invention is not limited to the following examples.

Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings, and the same reference numerals are assigned to the same or corresponding components regardless of the reference numerals, and redundant descriptions thereof will be omitted.

1 is a side cross-sectional view showing an assembly of a pipe fixing grip ring and a nut to prevent damage to an O-ring according to an embodiment of the present invention.

1, an assembly 10 of a pipe fixing grip ring and a nut for preventing damage to an O-ring according to an embodiment of the present invention includes a grip ring 100, a nut 200, a clamp ring 400, It may include washers (510, 520) and O-ring (600).

1 to 3, the grip ring 100 is used to fix the pipe 20 to a pipe member, such as a nut 200 or a pipe member 30 (see FIGS. 5 and 6), It may include a ring member 160, a locking portion 110, a gripping portion 120, a pressing protrusion 140, and a contact rib 150. Here, the pipe 20 includes a pipe for air conditioner, a pipe for transporting gas or liquid such as process gas, working fluid, chemical, water, refrigerant, heat, etc., and a pipe providing a movement path for various fluids. It may be, and a pipe made of various materials, including a metal material such as aluminum, copper, or iron, or a synthetic resin material may be applicable. For example, a bottleneck 21 (see FIG. 6) may be formed by deformation by pressure. It can be made of a material.

The ring member 160 has a ring shape for insertion into the outside of the pipe 20, and is made of a material or structure capable of deformation, for example, compression or contraction, and the material capable of compression or contraction is rubber, silicone, or synthetic resin. May be included, and a structure capable of contraction may include a wrinkle structure or a folding guide structure.

When the ring member 160 is inserted into the nut 200 from the bottom to the top, the locking portion 110 is locked to the inner side of the nut 200, for example, the locking protrusion 230, thereby limiting the release of the ring member ( 160) is formed on the outer surface. Therefore, the ring member 160 is prevented from being easily separated from the nut 200 by the locking portion 110 to increase assembly properties.

When the ring member 160 is inserted into the inside of the nut 200 and compressed by tightening the pipe member 30, for example, when the ring member 160 is compressed by the compression guide unit 240 of the nut 200 , It is compressed to grip the pipe 20, is formed to extend to one side, for example, upward on the ring member 160, and is formed in a ring shape like the ring member 160.

When the gripping portion 120 grips the pipe 20 by compression, the pressure protrusion 140 is pressed to form a bottleneck 21 (see FIG. 6) in the pipe 20. Formed on the side. In addition, the pressing protrusion 140 may be formed to have a ring shape on the inner surface of the gripping portion 120. Therefore, by compression of the gripping part 120, the bottle neck part 21 is formed in the pipe 20 by the pressure of the pressing protrusion 140, thereby increasing the degree of adhesion between the gripping part 120 and the pipe 20, so that the fluid flows out. To prevent it. A deformation guide groove 130 may be formed in the ring member 160. Here, the deformation guide groove 130 is formed between the gripping part 120 and the locking part 110 in the ring member 160 to guide the gripping part 120 to be deformed to grip the pipe 20. I can.

The contact ribs 150 are formed discontinuously at intervals along one side of the pressing protrusion 140 so as to be in close contact with the outer circumferential surface of the pipe 20. The contact ribs 150 are formed in a number of discontinuities with a gap, so that when the pipe 20 is pressed by the pressure protrusion 140, the pipe 20 is interposed between the pressure protrusion 140 and the pipe 20 ) To be easily deformed to minimize the drop in pressing force. In addition, the contact ribs 150 may have a close contact role so that the ring member 160 is not easily separated from the pipe 20, but can be easily expanded and contracted when fitted into the pipe 20 due to a plurality of divided structures.

When the grip ring 100 is compressed by the compression guide part 240 of the nut 200, when the pipe 20 is a refrigerant pipe for an air conditioner, the amount of pressing of the pipe 20 by the pressure protrusion 140 (d ) May be formed to correspond to the range of 0.36 ~ 0.48 mm. Here, when the pipe 20 is pressed by the grip ring 100 (d) is less than 0.36 mm, it has a problem that the fixing force of the pipe 20 by the grip ring 100 is insufficient, and is greater than 0.48 mm In this case, the amount of deformation of the pipe 20 by the grip ring 100 is excessive, so that the durability of the pipe 20 is greatly reduced.

Referring to FIGS. 1 and 4, the nut 200 may include a body 280, a seating part 220, a locking protrusion 230, and a compression guide part 240.

The body 280 is formed with a female threaded portion 260 for screwing with a male threaded portion 32 (see FIG. 5) of the pipe member 30 (see FIGS. 5 and 6) on the inner circumferential surface, and the female threaded portion 260 is a pipe By being formed to extend to the side into which the member 30 is inserted, it is possible to increase the screw fastening force with the pipe member 30 while being easy to manufacture.

The seating portion 220 is formed on the inner surface of the body 280 so as to limit the insertion depth of the ring member 160 by seating the ring member 160, and for example, may have a stepped structure.

The locking protrusion 230 is formed on the inner side of the body 280 so as to be caught on the locking portion 110 of the grip ring 100, for example, on the lower side of the seating portion 220.

The compression guide part 240 is formed to be inclined above the inner side of the body 280 to guide the gripping part 120 to be compressed to grip the pipe.

A deformation limiting jaw 250 may be formed on the body 280. Here, the deformation limiting jaw 250 is formed on one side, for example, on one side of the compression guide unit 240, in the body 280 so as to limit deformation to one side, for example, upward when the gripping portion 120 is compressed.

The nut 200 may have a facing surface 290 formed on a side facing the outer surface of the pipe 20 in contact with the deformation limiting protrusion 250 to form a surface facing the pipe 20. The nut 200 is reinforced by increasing the thickness of the portion where the stress is concentrated by the pressing of the grip ring 100 by the opposing surface 290, and increases the reliability of the compression of the grip ring 100. While increasing the durability.

The grip ring 100 is installed on the inner side of the nut 200 so that the locking portion 110 is caught by the locking protrusion 230, so that it is not easily separated from the nut 200, thereby improving assembly properties. In addition, the grip ring 100 may be assembled in the nut 200 together with the part 300, where the part 300 is a clamp ring 400 that primarily suppresses the pipe 20 from being separated from the nut 200. ), and washers 510 and 520 and O-ring 600 installed between the clamp ring 400 and the grip ring 100.

The O-ring 600 may be inserted outside the pipe 20 so as to be located on the opposite side of the contact rib 150 in the grip ring 100, and may be formed of at least one or more, for example, two.

Washers 510 and 520 may be inserted outside the pipe 20 so as to be positioned between the grip ring 100 and the O-ring 600 and between the O-ring 600 and the clamp ring 400, respectively. That is, the washers 510 and 520 may be installed to be positioned on both sides of the plurality of O-rings 600, for example, on the upper and lower sides of the plurality of O-rings 600.

Referring to FIG. 5, for piping connection, the pipe member 30 is screwed to the female screw portion 260 of the nut 200 by the male screw portion 32. At this time, the pipe 20 is supported by the stepped portion 31 of the pipe member 30, and the part 300 is supported by the supporting jaw 33 of the pipe member 30.

Referring to FIG. 6, when the grip ring 100 is compressed so as to be in close contact with the nut 200 by screwing the nut 200 and the pipe member 30, the grip ring 100 is It is compressed by the compression guide part 240 of the nut 200 to grip the outer circumferential surface of the pipe 20, at this time, by pressing the pressing protrusion 140 to form the bottleneck 21 on the pipe 20 , To increase the coupling force with the pipe (20). In addition, the gripping portion 120 is limited by the deformation limiting jaw 250 of the nut 200 so that the gripping portion 120 does not protrude or deviate from the outside of the nut 200, thereby preventing the gripping portion 120 ) To maintain the optimum shape for airtightness. In addition, the upper end of the pipe member 30 is supported by the support jaw 270 of the nut 200, thereby restricting tightening. At this time, the grip ring 100 is seated on the seating portion 220 of the nut 200 and maintained in a compressed state to increase the airtightness maintenance performance.

As described above, according to the assembly of the pipe fixing grip ring and the nut to prevent damage to the O-ring according to the present invention, the contact rib is formed on the inner circumferential surface of the upper end of the grip ring, so that when pressing due to use, the contact rib penetrates into the O-ring to prevent damage. By preventing the occurrence of the O-ring, it is possible to prevent leakage due to the breakage of the O-ring, and the reliability of the product can be ensured by smoothly recovering the shape of the O-ring in the heat resistance test.

In addition, according to the present invention, a plurality of contact ribs are formed discontinuously in the grip ring so that they are spaced apart from each other along the upper inner circumferential surface, so that deformation is easily made during compression, thereby minimizing interference with other members, and helping to compress the pipe. The fixing force to the pipe can be increased, and the O-ring is not directly in close contact with the grip ring, but through a washer, so that the O-ring is uniformly compressed during compression, thereby improving and maintaining airtightness.

In addition, according to the present invention, the female thread portion of the nut is extended to the insertion side of the pipe member, so that the manufacture of the nut is easy and the screwing force of the nut is excellent, and the stress during compression by screwing the pipe member from the nut Reinforcement for the concentrated tip is possible, and durability can be increased.

As described above, the present invention has been described with reference to the accompanying drawings, but, of course, various modifications and variations can be made without departing from the technical spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims and equivalents as well as the claims to be described later.

20: pipe 21: bottleneck
30: pipe member 31: stepped portion
32: male thread 33: support jaw
34: upper 100: grip ring
110: locking portion 120: gripping portion
130: deformation guide groove 140: pressure protrusion
150: contact rib 160: ring member
200: nut 220: seat
230: stopping protrusion 240: compression guide part
250: deformation limiting jaw 260: female thread
270: support jaw 280: body
290: facing surface 300: parts
400: clamp ring 510,520: washer
600: O-ring

Claims (5)

A grip ring used for fixing a pipe, a nut on which the grip ring is mounted inside, a clamp ring that suppresses separation of the pipe from the nut, and a washer and an O-ring installed between the clamp ring and the grip ring. In the assembly comprising,
The grip ring,
A ring member having a ring shape for insertion into the pipe and made of a material that can be deformed, and when the ring member is inserted into the nut from below to an upper side, it is caught on the inside of the nut, so that the escaping downward is limited. A locking portion formed on the outer surface of the ring member, a gripping portion extending upwardly to the ring member, and compressed to grip the pipe when the ring member is inserted into the nut and compressed, and the grip A pressing protrusion formed on the inner surface of the ping part and pressing the bottleneck part in the pipe when the gripping part grips the pipe, and a plurality of the pressing protrusions are spaced along one side of the pressing protrusion so as to be in close contact with the outer peripheral surface of the pipe. Including a contact rib formed discontinuously,
The nut,
A body having a female thread on the inner circumferential surface, a seating portion formed on the inner surface of the body to limit the insertion depth of the ring member by seating the ring member, and the ring member being separated downward by being caught in the locking portion. A locking protrusion formed on the lower side of the seating portion to be limited, a compression guide portion formed to be inclined to the inner surface of the body to guide the gripping portion to be compressed to grip the pipe, and when the gripping portion is compressed And a deformation limiting jaw formed on the upper side of the compression guide part in the body to limit deformation,
The O-ring,
It is inserted into the outside of the pipe so as to be located on the opposite side of the contact rib in the grip ring, consisting of at least one or more,
The washer,
It is inserted into the outside of the pipe so as to be positioned between the grip ring and the O-ring and between the O-ring and the clamp ring, respectively,
The grip ring,
An assembly of a pipe fixing grip ring and a nut to prevent damage to the O-ring, which is formed such that the amount of pressing of the pipe by the pressing protrusion falls within a range of 0.36 to 0.48 mm when compressed by the compression guide portion of the nut. delete delete The method according to claim 1,
The nut,
An assembly of a pipe fixing grip ring and a nut to prevent damage to an O-ring, wherein a female threaded portion for screwing with the pipe is formed to extend to a side into which the pipe is inserted. The method according to claim 1,
The nut,
An assembly of a pipe fixing grip ring and a nut to prevent damage to the O-ring, wherein a facing surface is formed on a side facing the outer surface of the pipe in contact with the deformation limiting jaw to form a surface facing the pipe.

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