KR20210026784A - Grip ring for pipe connecting device - Google Patents

Abstract

According to the present invention, a grip ring for a pipe connector is mounted as a ring on the circumference of an insertion pipe inserted into the center of a pressure ring to prevent the insertion pipe from departing from the center of the pressure ring, wherein a slope formed on the outer circumference is matched with the inner circumference surface of the center of the pressure ring to be pressed to the circumference of the insertion pipe by the movement of the pressure ring; a pressure surface pressed to the insertion pipe is formed on the inner circumference; at least one through groove penetrated in a longitudinal direction of the insertion pipe is formed on the pressure surface or the outermost surface having the largest external diameter; and the pressure surface can come in tight contact with the outer surface of the insertion pipe as the width of the through groove becomes narrower due to the movement of the pressure ring. According to the present invention, the grip ring for a pipe connector can reduce costs for manufacturing a pipe connector, can improve convenience in coupling grip rings, and can improve the watertightness of a pipe connector.

Description

Grip ring for pipe connecting device

The present invention relates to a pipe connection device requiring a watertight function and separation prevention, and more particularly, to a pipe connection device inserted into and connected to a socket. More specifically, it relates to a grip ring that serves to fix the insertion tube together with a pressure ring so that the insertion tube inserted into the socket does not fall out of the socket-type connector of the tube.

The most commonly used mechanical connection method for connecting cast iron pipes, synthetic resin pipes, and coated steel pipes is the socket connection method. In the socket connection method, the ends of two pipes that are connected by meeting each other become a socket, and the other end becomes a spigot inserted into the socket.

A socket connection type pipe connection device will be described with reference to the accompanying drawings. 1 is a cross-sectional view showing the configuration of a conventional pipe connecting device. The socket 61 is formed at one end of the socket tube 6, so that one end of the connected insertion tube 1 is inserted into the socket 61. The sealing ring 4 fills the gap between the socket and the insertion tube inserted into the socket. In Fig. 1, when the connection bolt 7 is tightened, the pressure ring 5 approaches the socket. As the pressure ring moves, the pressure ring pushes the grip ring 2, and at this time, the grip ring plays two roles in sequence. In the first step, the grip ring pushed by the pressure ring moves along the tube in the longitudinal direction of the tube and pushes the adjacent intermediate ring 3, and the intermediate ring pushes the sealing ring 4 described above. In the second step, when the grip ring (2) pushed by the pressure ring can no longer proceed in the longitudinal direction of the tube, the grip ring plays a role of holding the insertion tube while tightening the insertion tube around the circumference of the insertion tube as the inner diameter decreases. It is done. The grip ring crimped to the insertion tube is caught by the pressure ring together with the insertion tube, so that the central opening 64 of the pressure ring cannot be released. When the grip ring grips the insertion tube while tightening the insertion tube, a circumferential saw blade 25 extending long along the inner circumference is formed on the inner circumferential surface of the grip ring in order to prevent slipping off of the insertion tube held by the grip ring.

2 is a front view and a cross-sectional view showing a conventional grip ring. In order for the grip ring 2 to be compressed to the insertion tube 1, the inner diameter of the grip ring must be reduced. To this end, the grip ring is cut, and at the end of the cut, a compression space 21, which is an extra space that can be reduced when the grip ring is compressed to the insertion tube, is formed. Since there is no grip ring 2 in the area where there is a compression space, the sealing ring 4 cannot be pushed. The intermediate ring 3 uniformly transmits pressure to the sealing ring even in the part without the grip ring. The intermediate ring serves to uniformly transmit the pressure of the grip ring to the entire sealing ring between the grip ring and the sealing ring.

The socket connection method pipe connection device is a structure that can connect the pipes very stably, and is widely used in many types of pipes, and the grip ring for fixing the insertion pipe in the socket connection method is also a common technology. By the way, in the diameter of 300A or more, the grip ring is hardly used for the socket connection method. This is because the manufacturing cost of the grip ring and the intermediate ring is expensive compared to the method of simply fixing the pressure ring and the insertion tube with a few bolts. Both the grip ring and the intermediate ring must be formed of a hard metallic material, and as the size increases, there is a problem that the manufacturing cost including the mold cost increases significantly.

When the pressure ring pushes the grip ring, the first step of the sealing ring crimp and the second step of the insertion tube crimp must occur sequentially. When the second stage in which the grip ring is pressed against the insertion tube begins and the grip ring is pressed against the insertion tube, the grip ring can no longer move in the longitudinal direction of the insertion tube. Therefore, in the case where the first step of crimping the insertion tube is started while the first step of crimping the sealing ring is not sufficiently performed, there is a problem in that the sealing ring may not properly seal between the insertion tube and the socket, and thus fluid may leak. In the connection process of the pipe, the connecting bolts (7) around the pressure ring must be moved up and down, left and right evenly, but in the actual connection process, there may be cases where the connecting bolt on one side is excessively advanced compared to the other due to an operator's mistake. In this case, since the grip ring 2 is inclined and is caught in the insertion tube and cannot advance toward the sealing ring, there is a problem that the step 1 is passed to the second step before completion. If the scenery is large, this problem is even more serious.

The present invention has been conceived to solve the above problems, and provides a structure in which the compression space required for the grip ring is divided and distributed over the entire grip ring. When the compression space is dispersed, the unevenness occurring in the compression space is dispersed, and the intermediate ring, which was essential in the existing structure, can be removed. In addition, a structure capable of smoothly moving in the longitudinal direction of the insertion tube is provided without the grip ring being pinched in the insertion tube in the first step of compressing the sealing ring. It is an object of the present invention to provide a grip ring for a pipe connection device with low manufacturing cost and improved fastening convenience.

The grip ring of the pipe connecting device according to the present invention for realizing the above object is; Being mounted in the form of a ring around the insertion tube inserted into the central hole of the pressure ring so that the insertion tube does not come out of the central hole of the pressure ring; The inclined surface formed on the outer circumference corresponds to the inner circumferential surface of the central hole of the pressure ring, and can be compressed around the insertion tube by the movement of the pressure ring; The inner circumference is formed with a pressing surface that is compressed to the insertion tube; At least one through hole penetrating in the longitudinal direction of the insertion tube is formed on the outermost surface or the compression surface having the largest outer diameter; By the movement of the pressing wheel, the width of the groove is narrowed, and the pressing surface may be in close contact with the outer surface of the insertion tube.

In addition, two or more through holes are formed, or at least one through hole penetrating between the outermost surface and the pressing surface is formed; Adjacent through holes and through holes, or adjacent through holes and through holes may partially overlap each other when viewed in the circumferential direction.

In addition, the through hole and the through hole, or a part of the thin and long wall of the portion where the through hole and the through hole overlap each other may be removed, or there may be a notch made to have a thin wall thickness.

In addition, a length saw blade extending in the length direction of the insertion tube may be formed on the pressing surface.

In addition, a circumferential saw blade that is elongated in a circumferential direction may be intermittently formed on the pressing surface.

The main problem solving means of the present invention as described above will be described more specifically and clearly through examples such as'specific details for the implementation of the invention' to be described below, or the attached'drawings'. In addition to the main problem solving means as described above, various problem solving means according to the present invention will be additionally presented and described.

According to an embodiment of the present invention, by dividing the compression space required for reducing the inner diameter of the grip ring and distributing it to the entire grip ring, unevenness occurring in the existing compression space is eliminated. This provides the effect of removing the intermediate ring, which was essential in the existing structure. In addition, as the compression space is divided, it becomes easier for the grip ring to be compressed to the outer surface of the insertion tube as a whole along the circumference, and watertightness is improved.

By dividing and dispersing the compression space, more compression space can be secured than before. By using this, the inner diameter of the grip ring can be enlarged to provide an effect of improving the fastening convenience of the grip ring. In addition, by providing a vertical saw blade, when the grip ring moves along the insertion tube, the area that touches the insertion tube is minimized, and the circumferential saw blade, which interferes with the grip ring movement, does not touch the insertion tube, making the pipe connection process easier and more accurate. can do. Due to this, the watertight performance of the connection portion may also be improved.

As a result, the present invention has an effect of providing a grip ring of a pipe connecting device with improved watertightness, improved fastening convenience, and low manufacturing cost.

1 is a cross-sectional view showing the configuration of a conventional pipe connecting device.
2 is a front view and a cross-sectional view showing a conventional grip ring.
3 is a conceptual diagram showing a through hole (a) and a space wall (b) formed in the grip ring according to the present invention.
4 is a conceptual diagram showing a grip ring according to the present invention.
5 is a conceptual diagram showing a through hole and a through hole formed in a grip ring according to the present invention.
6 is a conceptual diagram showing a length saw blade and a circumferential saw blade formed on the pressing surface according to the present invention.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

In a preferred embodiment of the present invention described below, the insertion pipe and the socket pipe include not only a synthetic resin pipe and a coated steel pipe having a smooth surface, but also a metal pipe such as a cast iron pipe, an aluminum pipe, and a steel pipe. In addition, the shape of the pipe is not limited to the straight pipe, and may include all connecting pipes including a deformed pipe having various shapes including a curved pipe, a T-shaped pipe, and the like. In an embodiment of the present invention, several embodiments of a pipe connection device for connecting the above pipes to each other and a grip ring used in the pipe connection device will be described.

2 is a front view and a cross-sectional view showing a conventional grip ring. The outer circumferential surface of the grip ring 2 corresponding to the inner circumferential surface of the central sphere of the pressure ring becomes a tapered inclined surface 22. The inner circumferential surface of the grip ring forms a pressing surface 24 that is in close contact with the insertion tube. A circumferential saw blade 25 formed long along the circumferential direction of the insertion tube is formed on the pressing surface. Among both sides of the grip ring, the side with the sealing ring becomes a pressing surface 23 that applies pressure to the sealing ring. When the pressing ring 5 presses the inclined surface of the grip ring and the pressing surface of the grip ring is pressed against the insertion tube, the grip ring becomes integral with the insertion tube. When the insertion tube tries to exit the socket, the grip ring integrated with the insertion tube is stuck like a wedge between the insertion tube and the pressure ring, so that the insertion tube cannot come out of the socket. In the conventional grip ring shown in Fig. 2, a part cut in the middle is the compression space 21. When the inner diameter of the grip ring is reduced, the compression space is also reduced.

3 is a conceptual diagram showing a through hole (a) and a wall (b) formed in the grip ring according to the present invention. Compared to the conventional grip ring, the biggest difference between the grip ring of the present invention is that there is no broken part in the grip ring. In the existing grip ring, the broken part was essential to secure the reduction space for the reduction of the grip ring. In contrast, the grip ring shown in FIG. 3 is in the form of a ring connected to the whole, and the outermost surface 29 having the largest outer diameter on the outer surface of the grip ring on which the inclined surface 22 is formed and a crimping surface that is compressed to the outer surface of the insertion tube ( Each of the through holes 81 passing through the grip ring in the longitudinal direction of the insertion tube is formed in 24). The two through holes partially overlap each other when viewed in the circumferential direction, and a thin and long wall 83 is formed along the overlapping portion. When the grip ring receives force in the direction in which the inner diameter decreases by the pressure ring, the width of the through groove can be narrowed while the inter-wall is damaged. That is, the through groove 81 becomes the compression space 21 of the grip ring. The through grooves may be formed in two or more places at equal intervals, and the gripping space of the present invention has the effect of dispersing the compression space compared to the compression space of the existing grip ring. The compression space is an empty space on the sealing surface 23 of the grip ring and becomes a non-pressurized surface 85. Therefore, due to the dispersion of the compression space, the non-pressurization surface formed on the sealing surface is dispersed. In addition, as the non-pressurized surface is dispersed and one dispersed non-pressurized surface is reduced to a certain size or less, the intermediate ring 3 serving to block the non-pressurized surface is not required. That is, by dividing and dispersing the compression space of the grip ring by the structure proposed in the present invention, the intermediate ring, which was essential in the existing structure, is not required.

The grip ring must be able to pressurize the sealing ring 4 primarily by means of a pressure ring, and secondarily press the sealing ring 4 to the insertion tube 1 after the sealing ring is sufficiently pressed. If the inner diameter of the grip ring is reduced due to the breakage of the inter-wall 83 in a state in which the sealing ring is not sufficiently pressurized, the watertightness of the pipe connection may be problematic. Therefore, the inter-wall must have a certain thickness and length to withstand the shear stress of the stage in which the sealing ring is pressed. In order to reduce the stress caused by the breakage of the walls, a part of the walls may be removed so that the length of the walls may be shortened, or a notch 84 may be formed to make the thickness of the walls partially thin.

4 is a conceptual diagram showing a grip ring according to the present invention. Four through holes 81 penetrating the outermost surface 29 are formed, and four through holes 81 penetrating the pressing surface 24 adjacent to the through holes formed on the outermost surface are formed. The through holes are evenly arranged at equal intervals in four places, and an interlayer 83 is formed in each of the four places. Therefore, the grip ring shown in FIG. 4 is a distribution of eight large-sized compression spaces that existed as one existing one, and as a result, one large non-pressurized surface existing on the sealing surface 23 is divided into eight small non-pressurized surfaces to seal the whole. It is a structure that is distributed on the surface at equal intervals.

Another characteristic of the structure presented in the present invention compared to the conventional grip ring is that the grip ring is divided into stages and operated. Since the inner diameter of the grip ring does not decrease until the wall is damaged, the sealing ring can be sufficiently pressed without the grip ring being caught in the insertion tube. It is a structure that is compressed and fixed.

The grip ring in the present invention is characterized in that the compression space can be distributed throughout the grip ring. By using this feature, the compression space of the grip ring is divided into smaller portions and the spaces are again arranged at equal intervals, thereby making it easier to reduce the inner diameter of the grip ring. In addition, it is also possible to secure more compression space than in the existing structure. This makes it possible to make the size of the grip ring much larger than the outer diameter of the insertion tube before it is reduced. When the inner diameter of the grip ring is larger than the outer diameter of the insertion tube, the grip ring becomes easier to move the outer surface of the insertion tube, thereby facilitating the grip ring fastening process and increasing the accuracy of the grip ring fastening.

5 is a conceptual diagram showing a through hole and a through hole formed in a grip ring according to the present invention. The through hole 82 is a hole penetrating between the outermost surface 29 and the pressing surface 24 of the grip ring, and in FIG. 5, a square hole is formed. The outermost surface 29 on which the through groove 81 is formed in the grip ring has the largest outer diameter on the outer circumferential surface where the inclined surface 22 is formed. Branches can also be outer circumferences. In FIG. 5, the through hole and the through hole partially overlap each other when viewed in the circumferential direction, and a thin and long wall 83 is formed along the overlapping portion. Like the inter-wall formed between two adjacent through holes, the inter-wall of FIG. 5 is also formed to be damaged in the step of compressing the grip ring to the insertion tube. The through hole, the through hole, and the through hole were formed adjacent to each other, and the compression space was separated into three. In this case, Fig. 5(a) shows that the through holes or through holes do not overlap each other when viewed in the radial direction, whereas Fig. 5(b) shows the two through holes overlapping each other when viewed in the radial direction. When the through holes or through holes overlap each other in the radial direction, the non-pressurized surface overlaps. When the non-pressurized surfaces are overlapped, the non-pressurized surfaces are concentrated, resulting in an unfavorable structure for uniform pressing of the sealing ring. That is, it is preferable to disperse the through hole and the through hole so that they do not overlap each other when viewed in the radial direction, as shown in FIG. 5A. The more the through hole is formed, the better and wider the pressurized space can be dispersed, and thus the non-pressurized surface is dispersed, so that the pressure uniformity for the sealing ring is further improved. When considering the ease of manufacture and uniformity of pressure of the grip ring, two or less through holes are appropriate. If the number of neighboring through holes is increased, the non-pressurized surfaces divided into smaller portions are gathered next to each other. In order to more reliably distribute the non-pressurized surface, it is desirable to divide the through hole and the through hole in more places at equal intervals in several places of the entire grip ring.

Figure 6 is a conceptual diagram showing a longitudinal saw blade and a circumferential saw blade formed on the pressing surface according to the present invention. The grip ring, which fixes the insertion tube and prevents the insertion tube from dislodging, is particularly useful in a synthetic resin pipe made of PVC, PE, etc., or a pipe coated with a synthetic resin such as epoxy or PE, which has a low surface hardness of the insertion tube. In order to firmly press the grip ring to the insertion tube, the grip ring can be manufactured using relatively soft materials such as PVC, PE, rubber, etc. In this case, the pressing surface of the grip ring should contact the outer surface of the insertion tube. The pressing surface can be formed flat so that it can be used. However, if both the pressing surface of the grip ring and the outer surface of the insertion tube are flat and the surface is smooth, the area that the grip ring contacts the surface of the insertion tube increases and the friction between the two surfaces increases, so that the grip ring increases the surface of the insertion tube. There is a disadvantage that it becomes difficult to move along. To solve this, it is possible to form a length saw blade 26 that is formed long in the length direction of the insertion tube. The length saw blade shown in (a) of FIG. 6 serves to smoothly move the grip ring on the insertion tube by minimizing the contact area between the pressing surface of the grip ring and the outer surface of the insertion tube. Until the inter-wall 83 is damaged, only the length saw blade contacts the outer surface of the insertion tube. In a step in which the inner diameter of the grip ring decreases after the inter-wall is damaged, the length saw blade is embedded in the outer surface of the insertion tube, so that the entire compression surface of the grip lip comes into contact with the outer surface of the insertion tube. Therefore, in this case, the height of the length saw blade is preferably formed as low as 2mm or less.

A circumferential saw blade 25 that extends long along the circumference is formed on the pressing surface of the grip ring, and the circumferential saw blade forms a long line contact with the outer surface of the insertion tube along the circumference, so that the grip ring can be firmly compressed to the insertion tube . To this end, one or more rows of circumferential saw blades formed along the circumference can be formed on the pressing surface of the grip ring. However, in the case of a pipe made of synthetic resin such as a rigid PVC pipe and having a certain degree of hardness on the outer surface, cracks may occur due to damage to the surface of the insert pipe by the circumferential saw blade. In order to solve this, the circumferential saw blade may be intermittently formed as shown in FIG. 6(b).

In the case of the circumferential saw blade 25, the circumferential saw blade may be obstructed in the movement of the grip ring on the insertion tube. In particular, the movement of the circumferential saw blade in the direction of the sealing surface in which the angle of the circumferential saw blade is formed close to the vertical may hinder the movement of the grip ring when there are small projections on the surface of the insertion tube. Even in this case, the length saw blade 26 is very useful. As shown in Fig. 6(c), when the grip ring is moved by forming the length saw blade slightly higher than the circumferential saw blade, the circumferential saw blade does not touch the surface of the insertion tube, and only the length saw blade contacts the outer surface of the insertion tube. to be. In addition, so that the grip ring is easy to move the surface of the insertion tube, it is preferable that the saw blade protruding portion 27 of the length saw blade is formed to gently increase in height.

As described above, the technical ideas described in the embodiments of the present invention may be implemented independently, respectively, and may be implemented in combination with each other. In addition, the present invention has been described through the embodiments described in the drawings and the detailed description of the invention, but this is only illustrative, and various modifications and equivalent other embodiments are provided from those of ordinary skill in the art to which the present invention pertains. It is possible. Therefore, the technical protection scope of the present invention should be determined by the appended claims.

1: insertion tube 2: grip ring
3: intermediate ring 4: sealing ring
5: pressure ring 6: socket tube
7: connection bolt 21: compression space
22: inclined surface 23: sealing surface
24: pressing surface 25: circumferential saw blade
26: length saw blade 27: saw blade protrusion
29: outermost surface 81: through groove
82: through hole 83: between wall

Claims (5)

Being mounted in the form of a ring around the insertion tube inserted in the central hole of the pressure ring so that the insertion tube does not fall out of the central hole of the pressure ring;
The inclined surface formed on the outer circumference corresponds to the inner circumferential surface of the central hole of the pressure ring, and can be compressed around the insertion tube by the movement of the pressure ring;
The inner circumference is formed with a pressing surface that can be in close contact with the insertion tube;
At least one through hole penetrating in the longitudinal direction of the insertion tube is formed on the outermost surface or the compression surface having the largest outer diameter;
A grip ring of a pipe connection device, characterized in that by the movement of the pressure ring, the width of the through groove is narrowed, and the pressing surface can be in close contact with the outer surface of the insertion tube. The method according to claim 1,
Two or more through holes are formed, or at least one through hole penetrating between the outermost surface and the pressing surface is formed;
A grip ring of a pipe connecting device, characterized in that adjacent through holes and through holes, or adjacent through holes and through holes partially overlap each other when viewed in a circumferential direction. The method according to claim 2,
A grip of a pipe connecting device, characterized in that a part of the inter wall, which is a thin and long wall of the portion where the through hole and the through hole or the through hole and the through hole overlap with each other, is removed, or there is a notch made to make the thickness of the inter wall thin. ring. The method according to claim 1,
Grip ring of the pipe connection device, characterized in that the longitudinal saw blade is formed to be elongated in the longitudinal direction of the insertion tube on the pressing surface. The method according to claim 1,
Grip ring of a pipe connection device, characterized in that intermittently formed circumferential saw blades that are elongated in the circumferential direction on the pressing surface.

Images