JP6019539B2 - Pipe coupler - Google Patents

Description

  The present invention relates to a pipe coupler that connects two pipes that require airtightness and watertightness in the longitudinal direction, and an end portion of a grip ring provided between an inner wall of a casing and a sleeve bites into the inner wall of the casing and damages the casing. The present invention relates to a pipe coupler that prevents damage to the pipe.

  More specifically, in the present invention, when the coupler is configured using a casing made of a synthetic resin or the like, the grip ring can prevent the outer peripheral end of the grip ring from biting into the inner wall of the casing and damaging the casing. The present invention relates to a pipe coupler in which an erosion prevention ring is provided between the inner wall and the casing inner wall.

  In general, a pipe clamp or coupler connects two pipes with a bolt fastening force. A coupler used for a connection part that requires watertightness or airtightness is provided with a rubber sleeve inside, and the connection part is provided with a pipe body. This prevents the fluid or gas from flowing out.

  In particular, in the case of a coupler used for connecting high-pressure pipes, the internal pressure of the pipe performs a detaching action in the length direction of the pipe. It prevents it from leaving in the right direction.

  As techniques related to such a coupler, there are the following Patent Documents 1 to 4.

  In such a coupler, the bolt fastening force acts in the direction of the outer peripheral surface of the pipe, that is, in the direction perpendicular to the length direction, whereas the grip ring acts in the direction of about 45 ° in the pipe length direction. Thus, the pipe pushed in the length direction is directly fixed.

  In the coupling process, the inner space of the coupler is reduced by bolt fastening. Therefore, the grip ring mounted on the inner side of the coupler is also formed in a C shape having an opening on one side so that the diameter can be easily reduced when the coupler bolt is fastened.

  However, in the above-described process, the bolt is fastened, and the elastic sleeve is pressed against the pipe, and a part of the sleeve expands at both ends. The expansion of the sleeve is provided in contact with the end of the sleeve. Is transmitted to the grip ring. At this time, a part of the sleeve to be inflated is incorporated in a groove formed inside the grip ring, and the grip ring is strongly restricted from sliding along the end face of the sleeve.

  As described above, when resistance is generated at the engaging portion between the grip ring and the sleeve end, a stronger bolt fastening force is required for fastening the coupler, and the grip ring diameter is increased by the strong fastening force. Due to the reduction, there is a problem that the protruding portion of the sleeve fitted into the groove of the grip ring is damaged. In addition, when a certain time has elapsed, the coupling force of the coupler and the pressure resistance of the fluid to be transferred act, and the sleeve has bitten into the groove of the grip ring and is fixed. When the coupler is separated in this state, the grip ring However, even if the sleeves are not separated due to sticking together, there is a problem that a part of the sleeve fitted into the groove portion of the grip ring is torn.

  As a technique for solving such a problem, there is Patent Document 1 below.

  As shown in FIGS. 5 to 8, a sleeve 120 is provided inside the casing 110 of the coupler 100, and an end portion of the sleeve is provided with a cutting portion 130c and a plurality of incision grooves 130g on one side thereof. When the grip ring 130 is provided and the cutting portion 130c of the grip ring 130 is contracted as shown in FIG. 8B, both ends of the incision groove 130g stick to each other and the incision groove 130g is closed. A part of the sleeve is prevented from being inserted into 130 g. However, such a conventional coupler has an effect of preventing the sleeve from partially protruding into the incision groove 130g of the grip ring, but as shown in FIGS. There is an inconvenience that the end portion bites into the inner wall of the casing 110 and the casing is damaged.

  In particular, when such a coupler is used in the connection of a pipe installed in a ship or a vehicle, the grip ring 130 sequentially bites the inner wall of the casing 110 due to vibration generated by the movement of the vehicle or the ship, and the casing is damaged. As a result, the fluid flowing inside the pipe may be leaked.

Korean Patent Registration No. 0983087 Japanese Patent Application Laid-Open No. 2007-225094 Japanese Unexamined Patent Application Publication No. 2009-133446 Japanese Unexamined Patent Publication No. 2000-179761

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide an end portion of a grip ring provided between the inner wall of the casing and the sleeve. It is an object of the present invention to provide a coupler for a pipe that prevents the casing from being damaged by biting into the casing.

  More specifically, in the present invention, when the coupler is configured using a casing made of a synthetic resin or the like, in order to prevent the outer peripheral end of the grip ring from biting into the inner wall of the casing and damaging the casing, An object of the present invention is to provide a pipe coupler provided with an erosion prevention ring between the casing inner wall and the casing.

In order to achieve such an object, the present invention provides a pipe coupler having a grip ring having a plurality of incision grooves between both ends of a sleeve having elasticity and both inner walls of the casing.
An erosion prevention ring surrounding the edge of the grip ring is provided between the outside of the grip ring and the inner walls of both ends of the casing so that the outer peripheral end of the grip ring does not bite into the inner wall of the casing.

  Further, the erosion prevention ring constituting the coupler of the present invention includes an inner wall protection portion that surrounds the outer peripheral surface of the end portion of the sleeve, and an edge protection that is bent at a right angle to the inner wall protection portion to surround the outer peripheral end portion of the grip ring. Preferably, the edge protection part is formed by bending a plurality of incision grooves in the inner wall protection part and then bending inward.

  In addition, the erosion prevention ring is preferably an open circle in which a part is cut open and an opening is formed.

  According to the present invention, by providing the erosion prevention ring on the surface where the edge portion of the grip ring contacts the casing, there is an effect that the outer peripheral end portion of the grip ring can be prevented from biting the inner wall of the casing.

FIG. 1 is an exploded perspective view showing an example of a coupler according to the present invention. FIG. 2 is a sectional view showing an example of a coupler according to the present invention. FIG. 3 is a perspective view showing an example of the erosion prevention ring provided in the coupler according to the present invention. FIG. 4 is an enlarged view of a portion A in FIG. FIG. 5 is an exploded perspective view showing a conventional coupler. FIG. 6 is a cross-sectional view showing a conventional coupler. FIG. 7 is an enlarged view of a portion B in FIG. FIG. 8 is a plan view showing an operating state of the conventional grip ring.

  The present invention will be described in detail below with reference to the accompanying drawings.

  The present invention prevents the casing from being damaged by preventing the end portion of the grip ring from biting into the inner wall of the casing. For this purpose, the erosion prevention ring 1 is provided.

  A pipe coupling coupler having such an erosion prevention ring 1 is sandwiched between opposing ends of two pipes 200, and a sleeve 120 for preventing fluid leakage, and a casing for supporting the sleeve 120 110. These components are the same as or similar to those constituting the conventional coupler, but will be described below for the sake of understanding of the present invention.

  As shown in FIGS. 1 and 2, the sleeve 120 can be installed on a pipe 200 having a spiral or annular shape on the inner surface and a wrinkle formed on the outer peripheral surface. The casing 110 is installed outside the casing 110, and is tightly attached to the outer peripheral surface of the pipe by assembling the casing with a fixing bolt.

  The casing 110 is formed by hinge-joining two ends having end flanges 111 formed on both ends and a semicircular arc-shaped inner surface. A fixing bolt is provided on the opposite side of the hinge fixing portion. A bolt fixing hole is formed, and when the fixing bolt is tightened, the inner surface pressurizes the sleeve 120 so as to be in close contact with the pipe.

  When the sleeve 120 is expanded in the length direction in the process of fastening the fixing bolt in this manner, the sleeve cannot be hermetically adhered between the pipe and the casing. At both ends, terminal rods 111 are formed.

  In addition, the end rod 111 of the casing 110 is in close contact with and adjacent to the outer peripheral surface of the pipe 200 so that the sleeve 120 is not pushed between the end rod of the casing thus installed and the pipe. For this purpose, a grip ring 130 is provided as a member capable of acting at an angle of about 45 ° so as not to be detached when pressure is applied to the pipe.

  The grip ring 130 may have an annular shape, but in the process of installing the casing, the internal space is reduced by fastening the bolt to the casing, and accordingly, the grip ring 130 should also be reduced and the diameter should be reduced. Therefore, it is formed in a C-shape with one side open, and a plurality of incision grooves are formed on the inside in order to prevent twisting occurring in this process as the inner diameter of the casing becomes smaller. As a result, the grip ring 130 has an annular shape with one side opened in a “C” shape before installation, but after installation, the grip ring 130 has an annular shape, and an incision groove formed on the inner side is formed. It becomes narrower.

  In the coupler 100 configured as described above, as described above, the outer peripheral end portion of the grip ring 130 faces the inner wall of the end portion of the casing 110, that is, the inner corner portion between the casing main body portion and the end flange 111. In this state, when the fixing bolt is tightened to the casing 110, the outer peripheral end of the grip ring 130 bites into the inner wall of the casing 110.

  In particular, when the casing 110 is made of a material such as a synthetic resin and a coupler is used to connect a pipe installed in a ship, an automobile, or the like, the outer peripheral end of the grip ring 130 is formed on the inner wall of the casing 110 due to frequent vibration. As a result, the casing may be damaged or broken to cause fluid leakage.

  Therefore, as described above, the erosion prevention ring 1 is installed so that the outer peripheral end portion of the grip ring 130 does not wear the inner wall of the casing 110.

  As shown in FIGS. 2 and 4, the erosion prevention ring 1 is provided inside the end rods 111 at both ends of the casing 110 so that the outer peripheral end of the grip ring 130 does not come into contact with the casing 110.

  As shown in FIG. 3, the erosion prevention ring 1 has an inner wall protection portion 1 i sandwiched between the inner wall of the casing 110 and the outer wall of the sleeve 120 so as to surround the outer peripheral surface of the end portion of the sleeve 120. And an edge protection part 1e which is bent at a right angle to the inner wall protection part 1i and located between the outer peripheral edge part of the grip ring 130 and the edge part of the casing 110.

  As described above, the components provided in the casing 110 should be reduced by fastening a fixing bolt that is tightened in the process of assembling the casing, whereby the erosion prevention ring 1 is also opened on one side, It has a circular shape with an opening 1c. That is, when viewed from the front, a circular ring shape is formed, and one side is opened to form a “C” shape.

  In addition, the inner wall protection part 1i and the edge protection part 1e can be formed continuously. However, in the process where the casing 110 is tightened and contracted, the edge protection part 1e is distorted and has an irregular surface. As shown in FIG. 3, a plurality of incision grooves 1g are formed.

  That is, the edge protection part 1e in the erosion prevention ring 1 is formed by forming a plurality of incision grooves 1g in the inner wall protection part 1i and then bending inward.

  In the coupler according to the present invention configured as described above, the erosion prevention ring 1 is installed between the end 111 of the casing 110 and the outer peripheral end of the grip ring 130 as shown in FIG. Thus, the outer peripheral end portion of the grip ring 130 is prevented from biting into the inner wall of the casing 110 or being worn out.

1 Erosion prevention ring
1c opening
1g incision groove
1e terminal protection part 1i inner wall protection part
100 coupler
110 casing
111 terminal
120 sleeve
130 Grip ring
200 pipes

Claims (2)

In a coupler for a pipe provided with a grip ring having a plurality of incision grooves between both ends of an elastic sleeve and both end inner walls of the casing,
Between the outer side of the grip ring and the inner walls at both ends of the casing, an erosion prevention ring surrounding the edge of the grip ring is provided so that the outer peripheral end of the grip ring does not bite into the inner wall of the casing,
The erosion prevention ring includes an inner wall protection portion that surrounds the outer peripheral surface of the end portion of the sleeve, and an end wall protection portion that is bent at a right angle to the inner wall protection portion and surrounds the outer peripheral end portion of the grip ring. Pipe coupler.   2. The pipe coupler according to claim 1, wherein the erosion prevention ring has an open circular shape in which an opening is formed by cutting a part thereof. 3.

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