JP5748237B2 - Piping connection device and connection method thereof - Google Patents

Description

  The present invention relates to a pipe connecting device and a method for connecting a flexible tube using the same.

  When a branch pipe is connected to a main pipe through which a high-pressure fluid passes, various types of flexible tubes are used as the branch pipe, and the flexible tube is connected to the main pipe by a pipe connecting device.

  In recent years, in order to connect a flexible tube, for example, a pipe connection device having a structure in which a nipple is fastened to a T-shaped joint, an O-ring is then fitted, and a nut is fastened and fixed to the T-shaped joint is mainly used. ing. In this way, the method of fastening the nipple first is inconvenient and there are many points to be improved, and as a part of the improvement, there is a method of connecting the flexible tube to the T-joint in a state of being connected to the pipe connecting device. Has been developed.

  However, most of the conventional pipe connection devices applied to such a method have a complicated structure. In addition, the connection device having a simple structure developed to solve this problem has a problem in that the degree of compression of the O-ring of each product varies due to assembly tolerances.

  The present invention has been made to solve such a problem, and has a simple structure that can be fastened to an external pipe with a flexible tube connected thereto, and a pipe connection apparatus that is less affected by assembly tolerances, and the same. An object is to provide a connection method.

  In order to solve the above-described problems, the present invention provides a flexible tube having a fixed jaw projecting on an outer peripheral surface, and a first tube whose one end is locked to the fixed jaw so as to be relatively rotatable to the flexible tube. A first joint member, a first screw portion screwed into the first joint member, and a second screw portion formed opposite to the first screw portion in the axial direction and connected to an external pipe, The degree of compression by inserting the second joint member into the second joint member and the second joint member formed so as to rotate together with the first joint member rotating in a state of being fastened to the one joint member. Is provided, and the sealing member disposed between the inner peripheral surface of the second joint member and the outer peripheral surface of the flexible tube is provided.

  According to an aspect of the present invention, the outer peripheral surface of the flexible tube is provided with a mounting groove formed by recessing the outer peripheral surface of the flexible tube so that the seal member is mounted. The flexible tube may extend to the second screw portion so that the mounting groove is disposed at a position corresponding to the second screw portion.

  According to another aspect of the present invention, the flexible tube includes a ring-shaped ring member mounted on an outer peripheral surface thereof, and the ring member is fitted on the outer peripheral surface of the ring member. A mounting groove may be formed.

  According to still another aspect of the present invention, the inner peripheral surface of the second joint member is formed by recessing the inner peripheral surface of the second joint member so that the seal member is fitted to the inner peripheral surface of the second joint member. A joint member mounting groove may be provided.

  According to still another aspect of the present invention, the second joint member is formed on one side of the second threaded portion, and the flexible tube is in a state where the first joint member and the second joint member are fastened. A head portion including an abutting surface so as to abut on the first joint in the longitudinal direction may be provided.

  According to still another aspect of the present invention, a first washer made of a material different from that of the first joint member is disposed between the first joint member and the fixed jaw, and the second joint member and the A second washer made of a material different from that of the second joint member may be disposed between the fixed jaw.

  In order to solve the above problems, the present invention provides a method for connecting a pipe connection device for connecting the pipe connection device to an external pipe, the step of inserting the flexible tube into the first joint member, and the flexible tube. Fitting the seal member to the outer peripheral surface of the first, inserting a flexible tube fitted with the seal member into the second joint member, and fastening the first joint member and the second joint member; A pipe connection device including a step of rotating the first joint member and the second joint member in a state where the one joint member and the second joint member are fastened, and fastening the second joint member to the external pipe. Provide a connection method.

According to the pipe connection device and the connection method thereof according to the present invention, since the seal member is installed at a position separated from the first joint member, the degree of compression of the seal member is an assembly tolerance of the first and second joint members. Is no longer affected. Therefore, it is possible to realize a pipe connection device having a simple structure but high reproducibility.
Thereby, in a mass-produced product, the error of the sealing performance is small, and the pipe connection device in which the flexible tube is incorporated can be connected to the external pipe.

It is sectional drawing of the piping connection apparatus by one Embodiment of this invention. It is a flowchart which shows the connection method of the piping connection apparatus of FIG. It is an operation | movement figure which shows the operation | movement by which the piping connection apparatus of FIG. 1 is connected to external piping. It is a figure which shows the state by which the piping connection apparatus of FIG. 1 was connected to external piping. It is sectional drawing of the piping connection apparatus by other embodiment of this invention. It is sectional drawing of the piping connection apparatus by further another embodiment of this invention.

  Hereinafter, a pipe connecting device and a connecting method thereof according to the present invention will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar components are denoted by the same or similar reference numerals even in different embodiments, and the description thereof is omitted. As used herein, the singular forms include the plural unless specifically stated otherwise.

  FIG. 1 is a cross-sectional view of a pipe connection device 100 according to an embodiment of the present invention.

  As shown in FIG. 1, the pipe connection device 100 according to an embodiment of the present invention includes a flexible tube 110, a first joint member 120, a second joint member 130, and a seal member 140.

  The flexible tube 110 is made of, for example, a metal bellows tube, and a fixed jaw 111 projects from the outer peripheral surface of the flexible tube 110. The fixed jaw 111 is formed along the outer peripheral surface of the flexible tube 110. In other words, the fixed jaw 111 protrudes from the outer peripheral surface of the flexible tube, and one end of the flexible tube 110 is inserted into the first joint member 120. It is configured to be locked to the member 120, that is, to be positioned in the axial direction. With such a configuration, the first joint member 120 is connected to the flexible tube so as to be relatively rotatable.

  For example, the first joint member 120 may be a nut connected to the flexible tube 110 so as to be relatively rotatable. A first washer 151 made of a material different from that of the first joint member 120 is disposed between one surface of the first joint member 120 and the fixed jaw 111. Thereby, the fixed jaw 111 is locked to the first washer 151, and therefore the relative rotation between the first joint member 120 and the flexible tube 110 becomes smoother. Further, the fixed jaw 111 may be directly locked to the first joint member 120.

  The second joint member 130 may include a first screw part 131, a head part 132, and a second screw part 133. The first screw portion 131 is a portion that is screwed into the first joint member 120 and is formed on the inner surface of the head portion 132. The second screw part 133 is a part that has a step with respect to the head part 132, is formed opposite to the first screw part 131 in the axial direction, and is connected to an external pipe. The external pipe may be a T-shaped joint (see FIG. 3A). The second joint member 130 may be a nipple, for example.

  Due to the step between the second screw portion 133 and the head portion 132, a step portion 134 is formed between the inner surface of the second screw portion 133 and the inner surface of the head portion 132, and the end of the step portion 134 and the first joint member 120 is formed. A fixed jaw 111 is disposed between the two parts. Further, a second washer 152 made of a different material from the second joint member 130 is disposed between the second joint member 130 and the fixed jaw 111 on the opposite side of the first washer 151 via the fixed jaw 111. .

  The second joint member 130 is formed to rotate together with the rotation of the first joint member 120 in a state where the first screw part 131 is fastened to the first joint member 120. For example, the head portion 132 is configured to contact the first joint member 120 in a state where the first joint member 120 and the second joint member 130 are fastened. More specifically, the head portion 132 is formed on one side of the second screw portion 133, and the first joint is formed in the longitudinal direction of the flexible tube 110 in a state where the first joint member 120 and the second joint member 130 are fastened. A contact surface is included so as to contact the member 120.

  Thereby, the fastening of the second joint member 130 is completed, and when the first joint member 120 rotates relative to the flexible tube 110 in this state, the second joint member 130 also rotates together.

  Further, an adhesive may be applied to the first screw portion 131 so that the first joint member 120 is bonded. According to such a structure, the first joint member 120 and the second joint member 130 are integrated and can rotate relative to the flexible tube 110.

  The flexible tube 110 will be described again. The flexible tube 110 extends toward the second joint member 130 through the step portion 134. More specifically, the flexible tube 110 may extend to a position facing the inner surface of the second screw portion 133 of the second joint member 130.

  The seal member 140 is interposed between the inner peripheral surface of the second joint member 130 and the outer peripheral surface of the flexible tube 110 so that the degree of compression is set by inserting the flexible tube 110 into the second joint member 130. Be placed. For example, the seal member 140 may be an O-ring or a U-ring.

  More specifically, the outer peripheral surface of the flexible tube 110 is recessed so that the seal member 140 is attached to the outer peripheral surface of the flexible tube 110. In other words, the flexible tube 110 is formed by forming a recess in the outer peripheral surface. The flexible tube 110 extends to the second screw portion 133 such that the mounting groove 112 is disposed at a position corresponding to the second screw portion 133.

  The mounting groove 112 includes a first mounting groove 112a and a second mounting groove 112b, and the seal member 140 includes a first seal member 141 and a second seal member 142 so as to correspond thereto. Therefore, since the sealing member 140 is fitted in the mounting groove 112 of the flexible tube 110, a design with very little assembly tolerance and manufacturing tolerance is possible even if a plurality of portions are sealed.

  Further, according to such a structure, even if the first joint member 120 and the second joint member 130 rotate relative to the flexible tube 110, a new compressive force is hardly applied to the seal member 140. The degree of compression of the member 140 continues to be maintained.

  Hereinafter, a method of connecting a flexible tube to an external pipe using the pipe connecting device will be described. FIG. 2 is a flowchart showing a connection method of the pipe connection device of FIG. 1, and FIGS. 3A and 3B are operation diagrams showing how the pipe connection device of FIG. 1 is connected to an external pipe.

  As shown in FIG. 2, in the connection method of the pipe connection device, first, the flexible tube is inserted into the first joint member (S100), the seal member is fitted to the outer peripheral surface of the flexible tube, and the seal The flexible tube fitted with the member is inserted into the second joint member, and the first joint member and the second joint member are fastened (S200). The piping connection device is completed by such a process.

  Next, the first joint member and the second joint member are rotated in a state where the first threaded portions of the first joint member and the second joint member are fastened, and the second joint member is fastened to the external pipe. (S300). As described above, the external pipe may be a T-shaped joint.

  This will be described in more detail with reference to FIGS. 3A and 3B as follows. When at least one of the first joint member 120 and the second joint member 130 is rotated while the second screw part 133 is inserted into the T-shaped joint T until the second joint member 130 is completely fastened to the T-shaped joint T. The first joint member 120 and the second joint member 130 rotate together. At this time, since the other side of the flexible tube 110 (the side opposite to the portion inserted into the first joint member 120 and the second joint member 130) is fixed, the flexible tube 110 does not rotate. That is, the operator can perform fastening to the T-shaped joint T by rotating only the first joint member 120 and the second joint member 130 with the flexible tube 110 fixed. In this case, even if relative rotation of the first joint member 120 and the second joint member 130 occurs, the compressive force applied to the seal member 140 (see FIG. 1) does not change. Thereby, the degree of compression of the seal member 140 is maintained.

  As described above, in the pipe connection device according to the embodiment of the present invention, the assembly tolerance and the manufacturing tolerance can be managed in a compact manner with a simple structure. Such a pipe connection device can be modified into various forms. Hereinafter, although the piping connection apparatus by other embodiment of this invention is demonstrated, the description is abbreviate | omitted about the component same or similar to the said embodiment.

  4A and 4B are cross-sectional views of a pipe connection device according to another embodiment of the present invention.

  As shown in FIG. 4A, a ring-shaped ring member 250 may be attached to the outer peripheral surface of the flexible tube 210. That is, the ring member 250 may be inserted into the flexible tube 210 and fixed by, for example, welding.

  In this case, the position of the ring member 250 is a point facing the inner surface of the second screw portion 233 of the second joint member 230, and the ring member is mounted so that the seal member 240 is fitted on the outer peripheral surface of the ring member 250. A groove 251 is formed. Thus, since the groove | channel in which the sealing member 240 is mounted | worn is formed in a separate member, the manufacturing precision of a pipe connection apparatus can be improved further. For this reason, the ring member 250 may be made of a material different from that of the flexible tube 210, for example, a harder material.

  Further, as shown in FIG. 4B, the inner peripheral surface of the second joint member 330 is recessed on the inner peripheral surface of the second joint member 330 so that the seal member 340 is fitted, in other words, the inner peripheral surface. A second joint member mounting groove 331 may be provided by forming a recess in the bottom. That is, the seal member 340 is fitted not on the flexible tube 310 but on the inner surface of the second screw portion 333. Further, since the second joint member 330 is made of a material harder than the flexible tube 310, the user can adjust the position of the seal member 340 more precisely.

  The pipe connection device and the connection method thereof according to the present invention are not limited to the configuration and method of the above-described embodiment, and can be variously modified by selectively combining all or part of each embodiment. Can do.

DESCRIPTION OF SYMBOLS 100 Pipe connection apparatus 110 Flexible tube 111 Fixed jaw 112 Mounting groove 120 1st joint member 130 2nd joint member 131 1st screw part 132 Head part 133 2nd screw part 140 Seal member 151 1st washer 152 2nd washer

Claims (7)

A flexible tube having a fixed jaw protruding on the outer peripheral surface;
A first joint member connected to the flexible tube so as to be relatively rotatable and having one end locked to the fixed jaw;
A first screw part screwed into the first joint member; and a second screw part formed opposite to the first screw part in the axial direction and screwed into an external pipe. A second joint member formed to rotate together with the first joint member rotating in a fastened state;
A sealing member disposed between the inner peripheral surface of the second joint member and the outer peripheral surface of the flexible tube so that the degree of compression is set by inserting the flexible tube into the second joint member. When,
Including
A mounting groove on which the seal member is mounted is formed on the outer peripheral surface of the flexible tube,
The first screw portion and the second screw portion are arranged separately in the longitudinal direction of the flexible tube,
The pipe connection device, wherein the flexible tube extends to the second screw portion so that the mounting groove is disposed at a position corresponding to the second screw portion. 2. The pipe connection device according to claim 1, wherein the second joint member includes a stepped portion facing the first joint member with the fixed jaw interposed therebetween . A first washer disposed between the first joint member and the fixed jaw;
A second washer disposed between the stepped portion and the fixed jaw;
Including
The pipe connection device according to claim 2, wherein the first washer and the second washer are configured to facilitate relative rotation of the first joint member and the second joint member with respect to the flexible tube. .   The flexible tube includes a ring-shaped ring member mounted on an outer peripheral surface thereof, and a ring member mounting groove is formed on the outer peripheral surface of the ring member so that the seal member is fitted. The pipe connection device according to claim 1.   The inner surface of the second joint member is provided with a second joint member mounting groove formed by recessing the inner surface of the second joint member so that the seal member is fitted. The pipe connection device according to claim 1.   The second joint member is formed at one end of the second screw portion and abuts on the first joint member in the longitudinal direction of the flexible tube in a state where the first joint member and the second joint member are fastened. The pipe connection device according to claim 1, further comprising a head portion configured to include a contact surface. In the connection method of the pipe connection apparatus which connects the pipe connection apparatus of any one of Claims 1-6 to external piping,
Inserting the flexible tube into the first joint member;
Fitting the seal member on the outer peripheral surface of the flexible tube;
Inserting the flexible tube fitted with the seal member into the second joint member, and fastening the first joint member and the second joint member;
Rotating the first joint member and the second joint member in a state where the first joint member and the second joint member are fastened, and fastening the second joint member to the external pipe;
A method for connecting a pipe connection device, comprising:

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