JP4740219B2 - Pipe connection structure - Google Patents

Description

  The present invention relates to a pipe connection structure for attaching an end of a pipe to a connection port or the like.

  A pipe is a hollow or solid bar, and is used to transport fluids such as water and gas, and is also used as a material for handrails and fences. Such pipes are rarely used alone, and are usually connected to manifolds, valves, other pipes, etc., to realize fluid conveyance and the like. When connecting pipes, parts such as unions and elbows have been used for a long time, and there are various methods such as attaching a flange to the end face of the pipe.

Various technical developments have been made on a connecting structure that integrates two pipes, and the following Patent Document 1 can be cited as an example that does not consider fluid transport. This technique is applied to a handle of a household cleaning tool, and is characterized by a structure that can be easily detached and can be prevented from being damaged. Moreover, the following patent document 2 is mentioned as an example of the technique which connects the pipes made from vinyl chloride. This technique includes two joints integrated with each pipe by bonding, and the joints are integrated by a lock arm, and the pipe can be attached and detached simply by rotating the lock arm about 90 degrees. Therefore, it is extremely convenient in places where pipes are repeatedly attached and detached. Next, Patent Document 3 is used in a pipe for flowing a refrigerant of an air conditioner, etc., and a plug is attached to one of the ends of two pipes, a socket is attached to the other, and the plug is formed in an insertion portion. Both are integrated by fitting the eccentric ring of the socket into the engagement groove, and the seal can be prevented from being damaged even when it is repeatedly attached and detached.
JP 2007-247907 A JP 2002-81592 A JP-A-8-4965

  Regarding the pipe connection structure, in household vacuum cleaners, etc., there is also a simple structure that connects both with only friction when two pipes are inserted, but this can not sufficiently resist the tensile load, Is extremely narrow. In addition, a simple method of winding an adhesive tape around the connecting portion is also widely used. However, this method has low rigidity and is uneasy for aging. In the case of pipes that carry various fluids, the method of forming pipe screws at the ends and screwing them in has been popular for a long time. However, it is necessary to turn the nuts many times and the workability is poor. There is also a risk that the tightening may be left incomplete, and loosening may occur over time. For this reason, many products called “one-touch joints” that do not use screws are used, but there is a tendency for the structure to be complicated, such as attaching special parts to the end face of the pipe.

  Each of the above patent documents assumes that the pipe is repeatedly attached and detached, but since Patent Document 1 assumes the handle of the cleaning tool, the sealing property is not considered, and the end face of the pipe It is necessary to finish the shape into a unique shape, and it is difficult to use it in various situations. In addition, Patent Document 2 uses parts having a complicated shape such as a lock arm, which is likely to increase costs, and a joint is attached to the end of the pipe by bonding or the like. However, there is a problem that the number of parts is large. The following Patent Document 3 is also assumed to be used in a refrigerator, an air conditioner, and the like, and the sealing mechanism and the fitting mechanism are not simple and are difficult to use for general purposes in terms of cost.

  The present invention was developed on the basis of such a situation, and has a high versatility regardless of the use, and is excellent in terms of workability and cost, and further provides a highly reliable pipe connection structure. It is an object.

The invention according to claim 1 for solving the above-mentioned problems comprises a pipe, a connecting pipe, and a fixing cap for interposing between the pipe and the connecting pipe to couple them together. A concave portion is formed in an annular shape on the outer peripheral surface in the vicinity of the end portion of the pipe, and an introduction portion having an inner diameter larger than the outer diameter of the pipe is formed at the end portion of the connecting pipe. The inner cylinder that fits between the outer peripheral surface of the pipe and the introduction portion of the connecting pipe, the outer cylindrical body that surrounds the outer peripheral surface of the connecting pipe, and the end of the inner cylindrical body and the end of the outer cylindrical body are connected. A slit for elastically expanding the inner cylinder, the inner diameter of the inner cylinder is equal to the outer diameter of the pipe, and the outer diameter of the inner cylinder is introduced. equal to the inner diameter of the section, the inner diameter of the outer cylindrical body is equal to the outer diameter of the connecting tube, the inner peripheral surface of the inner cylindrical body, the convex portion engaged with the recess Annularly formed, the connection pipe and the fixed cap, the locking portion in one for integrating both a connecting structure of a pipe, characterized in that is provided with a locked portion on the other.

  An object of the present invention is to connect the end of a pipe to a connecting pipe. Among these, the pipe is limited to a circular cross section, but it is not necessarily hollow and may be solid. The connecting pipe is also limited to a circular cross section, but its form is flexible such as a general long pipe, a short pipe into which a hose or the like is inserted, or a pipe protruding from the manifold. The fixed cap has a cylindrical shape and concentrically integrates the pipe and the connecting pipe. The pipe is inserted from one end face side, and the connecting pipe is inserted from the other end side.

  The material of the pipe is not limited, but it needs to be hard enough not to be easily deformed, and it is preferable to use a metal or hard resin. The end face is cut at a substantially right angle with respect to the axial direction, and a groove-like recess is formed at a position slightly away from the end face. Since the concave portion is formed so as to surround the outer peripheral surface of the pipe in an annular shape, the concave portion has a shape constricted at one place. About the cross-sectional shape of a recessed part, semicircle, U shape, V shape etc. are free, and there is no restriction | limiting in depth. In addition, the position of the recess is determined each time in relation to other fixed caps and is not limited to a specific numerical value. For example, if the diameter is about 30 mm, the position is about 20 mm from the end face. .

  The connecting pipe can be of any length, but it must be sized so that the tip of the pipe can be inserted into it, and the inner diameter of the predetermined section from the end face is larger than the outer diameter of the pipe. It is necessary to form an introduction part that is spaced apart. Further, an intermediate part with a reduced inner diameter can be formed on the inner side of the introduction part as necessary, and the structure can be configured to hold the tip of the inserted pipe. In addition, there is no restriction | limiting in an internal diameter about the area where the pipe ahead of an introduction part or an intermediate part does not reach | attain. Moreover, about the outer peripheral surface of a connection pipe, there is no restriction | limiting in a shape about the area where a fixed cap does not reach | attain.

  The fixed cap is arranged so as to straddle the boundary between the pipe and the connecting pipe, and has the function of integrating both. Basically, the two cylinders of the inner cylinder and the outer cylinder are concentrically arranged. is there. Among them, the inner cylinder has the same inner diameter as the outer diameter of the pipe so that the pipe can be inserted into the inner peripheral surface, and the inner peripheral surface has a convex portion protruding toward the center. Is formed in an annular shape. The convex portion is paired with the concave portion of the pipe, and the movement of the pipe in the axial direction is restricted by fitting the convex portion and the concave portion. On the other hand, since the outer cylinder is arranged so as to take in the outside of the inner cylinder, an annular space is formed at the boundary between the two, and the end of the connecting pipe is inserted into this. Therefore, the outer diameter of the inner cylinder is equal to the inner diameter of the introduction part of the connection pipe, and the inner diameter of the outer cylinder is equal to the outer diameter near the end of the connection pipe. However, in practice, in order to realize smooth insertion / extraction of the connecting pipe, it is preferable to secure a minute gap on the interface with the connecting pipe. The side plate integrates the inner cylindrical body and the outer cylindrical body, and is formed in a disc shape that spreads in the radial direction, and is integrated with the end surfaces of both cylindrical bodies.

  In addition, it is necessary to form a slit extending in the radial direction in the fixing cap. The slot is a cut formed in the radial direction from the outer peripheral surface of the disk-shaped object toward the center, and is used in various industrial parts. In the present invention, the entire fixing cap is deformed by expanding the slit width, and the inner peripheral surface of the inner cylinder is expanded. As a result, when the pipe is inserted, it is possible to pass the pipe through the narrow part generated by the convex part of the inner cylinder, and when the convex part and the concave part are aligned, both are fitted, and the pipe and the fixing cap are integrated. Turn into. In order to realize this, as the material of the fixing cap, an elastic material such as hard resin or metal is used.

  The locking part and the locked part are for integrating the connecting pipe and the fixing cap. If the fixing cap does not detach from the connecting pipe, its specific structure is free and the fixing cap is connected. There is no problem even if it can rotate around the tube. Moreover, after the latching | locking part and the to-be-latched part are integrated, the structure which can isolate | separate both again may be sufficient.

  By configuring in this way, when inserting the pipe into the inner cylinder of the fixed cap, it is possible to spread the convex portion by slitting, the pipe can pass through the convex portion without hindrance, and the convex portion and the concave portion are When the alignment is complete, the slot is restored and the pipe and the fixed cap are integrated. Furthermore, by inserting the connecting pipe into the gap between the inner cylinder and the outer cylinder of the fixed cap, the inner cylinder is surrounded by the connecting pipe, and deformation that expands the width of the slot becomes impossible. Can no longer be removed from the fixed cap. Also, when the connecting pipe is inserted into the fixing cap, the locking part and the locked part function and the connecting pipe and the fixing cap are integrated, so that the pipe and the connecting pipe are finally connected via the fixing cap. Will be linked.

  The invention described in claim 2 is characterized in that an O-ring is sandwiched between the outer peripheral surface of the pipe and the introduction portion of the connecting pipe in order to ensure the sealing performance of the connecting portion. The invention described in claim 1 simply connects the pipe to the connecting pipe, and is difficult to apply to the conveyance of the fluid. Therefore, by sandwiching an O-ring between the outer peripheral surface of the pipe and the inner peripheral surface of the connecting pipe, the inside of the pipe and the connecting pipe is completely shut off from the outside, and the hermeticity can be maintained. In addition, as a space for sandwiching the O-ring, an introduction part in which the inner diameter of the connection pipe is enlarged is used.

According to a third aspect of the present invention, there is provided a flexible pipe, a connecting pipe, a fixing cap that is interposed between the pipe and the connecting pipe to couple them together, and is inserted into an end of the pipe. An introduction pipe having an inner diameter larger than the outer diameter of the pipe is formed at the end of the connection pipe, and the fixing cap includes an outer peripheral surface of the pipe and an introduction section of the connection pipe. An inner cylinder that fits between the outer cylinder, an outer cylinder that surrounds the outer peripheral surface of the connecting pipe, and a side plate that connects the end of the inner cylinder and the end of the outer cylinder, A slit for elastically expanding the cylinder is formed , the outer diameter of the inner cylinder is equal to the inner diameter of the introduction part, the inner diameter of the outer cylinder is equal to the outer diameter of the connecting pipe , On the inner peripheral surface, a convex portion for pressing the auxiliary pipe and the pipe is formed in an annular shape, and both the fixing cap and the connecting pipe are integrated. One the engaging portion to a connecting structure of a pipe, characterized in that is provided with a locked portion on the other.

  The invention described in claim 3 assumes that a deformable hose or the like is used as the pipe. In such a case, even if the concave portion is formed in the pipe as in the first aspect of the invention, when the tensile load is applied, the concave portion may be deformed and detached from the convex portion. Therefore, the present invention is characterized in that a rigid auxiliary pipe is inserted into the pipe and the pipe is sandwiched between the auxiliary pipe and the convex portion. Therefore, it is not necessary to form a recess in the pipe as in the first aspect of the invention, and an auxiliary pipe is used instead. Other fixing caps and connecting pipes are the same as those of the first aspect of the invention. The auxiliary tube may have a simple form in which a hard material such as a metal tube is inserted into the end of the pipe, but may be formed integrally with the connecting tube.

  The invention according to claim 4 specifies the locking portion and the locked portion, and the locking portion is a claw formed on the inner peripheral surface of the outer cylindrical body of the fixed cap, and the locked The portion is a locking groove that is formed on the outer peripheral surface of the connecting pipe and engages with the claw. The locking groove is a groove formed by cutting the outer peripheral surface of the connection pipe, and does not necessarily have to be annular, and may be formed intermittently. The claw is a convex shape formed on the inner peripheral surface of the outer cylindrical body of the fixed cap, and the movement of the fixed cap is constrained by fitting into the locking groove. Of course, the locking groove and the claw need to be arranged so that they only function when the fixing cap is inserted to a predetermined position.

  The invention according to claim 5 relates to the locking groove, and is characterized in that a guide groove is formed between the end portion of the connecting pipe and the locking groove. When the attachment and detachment of the pipe and the connecting pipe are repeated, it is preferable that the engaging groove and the claw that are once engaged can be easily separated. Therefore, a guide groove is provided between the end of the connecting pipe and the locking groove, and the claw is moved from the locking groove to the guide groove by a simple operation such as turning the fixing cap. Will be possible, and convenience will be further improved. The depth of the guide groove is preferably equal to that of the locking groove, but a locally shallow portion may be provided to prevent loosening due to vibration or the like.

  According to the first aspect of the present invention, a concave portion is formed in the pipe, and the convex portion of the fixing cap is fitted into the concave portion, and then the connecting pipe is inserted into the fixing cap, whereby the inner cylinder body of the fixing cap. Since the elastic deformation that expands the inner diameter becomes impossible, the concave portion cannot be detached from the convex portion, and the pipe is firmly integrated with the fixed cap, and can receive the load acting in the axial direction. In addition, since the fixing cap is integrated with the connection pipe by the locking portion and the locked portion, the pipe can be reliably coupled to the connection pipe and is highly reliable. Further, in the present invention, it is only necessary to form an annular recess for the pipe, the cost during processing can be suppressed, and if the hardness is constant, the material is not limited and the versatility is extremely high. In addition, since the convex part fitted into the concave part has a structure that can be deformed by slitting, it is excellent in workability when the pipe is inserted into the fixed cap.

  To connect the pipe and connecting pipe, just insert the pipe into the fixed cap, fit the convex and concave parts, and then insert the connecting pipe between the inner and outer cylinders of the fixed cap. Thus, the workability is greatly improved as compared with a conventional screw. In the present invention, it is necessary to newly manufacture a fixing cap, but it is a simple shape based on two cylinders, and can be manufactured by various methods such as integral molding using a mold and cutting, Can be mass-produced at low cost.

  As in the second aspect of the invention, by sandwiching an O-ring between the outer peripheral surface of the pipe and the inner peripheral surface of the connecting pipe, the internal sealing is ensured and can be applied to transfer of various fluids. Improve further. A plurality of O-rings can be arranged side by side as needed, and can cope with severe environments such as high pressure acting.

  As in the third aspect of the invention, even when a flexible hose is used as a pipe, the pipe can be sandwiched between the auxiliary pipe and the convex portion by inserting the auxiliary pipe into the pipe. It is possible to prevent the pipe from being pulled out by both frictions, and the same effect as the invention of claim 1 can be exhibited.

  As in the fourth aspect of the invention, as means for integrating the fixed cap and the connecting pipe, the claw formed on the inner peripheral surface of the outer cylindrical body of the fixed cap and the outer claw formed on the outer peripheral surface of the connecting pipe are engaged with the claw. By using the locking groove, it is possible to connect the fixing cap to the connecting pipe on a simple principle, and it is durable against a tensile load. Further, as in the invention described in claim 5, by providing the guide groove, it becomes easy to remove the claw engaged with the locking groove again, and the pipe can be repeatedly attached and detached, and the fixing cap is connected to the connecting pipe. When attaching to the head, it is very convenient because it requires only a simple rotation after the fixing cap is simply inserted.

  FIG. 1 is a perspective cross-sectional view showing the basic principle of the present invention. FIG. 1 (A) shows a state in which each component is separated, and FIG. 1 (B) shows a state in which a pipe 11 is incorporated in a fixed cap 21. 1 (C) is a state where the whole is connected. In the present invention, the pipe 11 and the connecting pipe 41 are integrated by the fixing cap 21, and both of these are based on a cylindrical shape. The pipe 11 is made of a hard resin such as vinyl chloride and has such a hardness that it hardly undergoes elastic deformation by human power, but there is no restriction on its length. However, in the vicinity of the end portion, it is necessary to form a recess 12 whose outer peripheral surface is cut into an annular shape. The recess 12 has the same cross-sectional shape at any position on the entire circumference, and is not interrupted. Further, the end surface of the pipe 11 is provided with a conical wedge portion 13 in preparation for being inserted into the connecting tube 41.

  An introduction portion 42 having an enlarged inner diameter is formed near the end portion of the connection pipe 41, and the distal end portion of the pipe 11 is accommodated at the back of the introduction portion 42, so that it is equal to the outer diameter of the pipe 11. An intermediate portion 43 having an inner diameter is formed. Further, an annular locking groove 44 is formed on the outer peripheral surface of the connection pipe 41. In addition, about the connection pipe 41, there is no restriction | limiting in shape etc. about the inner part which does not contact the pipe 11 and the fixed cap 21. FIG.

  The fixed cap 21 is formed by concentrically arranging two cylinders. An outer cylinder 23 is located outside, and the inner cylinder 22 is accommodated in the outer cylinder 23. The end surfaces of both cylinders are integrated by the side plate 24. The inner cylindrical body 22 has an inner diameter equal to the outer diameter of the pipe 11, and a convex portion 25 that is paired with the concave portion 12 of the pipe 11 is formed on the inner peripheral surface of the inner cylindrical body 22. The pipe 11 is restricted from moving in the axial direction by inserting the pipe 11 and fitting the convex portion 25 and the concave portion 12 together. There is a gap at the boundary between the inner cylinder 22 and the outer cylinder 23, the outer diameter of the inner cylinder 22 is equal to the inner diameter of the introduction portion 42 of the connection pipe 41, and the inner diameter of the outer cylinder 23 is the connection pipe. It is the same as the outer diameter of 41 and has a structure in which the tip of the connecting pipe 41 can be inserted into the boundary between both cylinders.

  A claw 27 is formed on the inner peripheral surface of the outer cylindrical body 23 so as to be fitted into the locking groove 44 of the connection pipe 41. The claw 27 does not necessarily need to be annular, and may be secured in two symmetrical places as shown in the figure. In addition, the claw 27 in this figure has a triangular cross section in consideration of workability when attached to the connecting pipe 41. Therefore, when mounting, the fixed cap 21 is deformed so that it slightly expands due to the reaction force from the inclined surface, so that smooth movement is realized, and after fitting into the locking groove 44, both sides are firmly Engage and integrate.

  The fixed cap 21 is not a complete circular cross section, but is entirely cut by a plane extending in the radial direction from the center, and the cross-sectional shape is a C-shape. Such tearing is generally referred to as slitting and is used for various machine parts. In the present invention, the slit is used for elastically deforming the fixing cap 21 and inserting the pipe 11. Originally, the portion where the convex portion 25 is formed has a narrow inner diameter and cannot be inserted through the pipe 11, but the inner peripheral surface of the inner cylindrical body 22 is expanded by expanding the slot 26, so that the insertion is possible. Finally, the convex portion 25 and the concave portion 12 can be fitted together.

  As shown in FIG. 1 (B), when the pipe 11 is inserted into the fixing cap 21 and the convex portion 25 and the concave portion 12 are fitted together, when a large tensile load is applied to the pipe 11, the slit 26 is There is also a possibility that the pipe 11 is pulled out and pulled out. However, when the connecting pipe 41 is inserted into the fixed cap 21 as shown in FIG. 1C, the outer peripheral surface of the inner cylinder 22 is surrounded by the connecting pipe 41, and the inner cylinder 22 pushes the slot 26. Can not be deformed to spread. Therefore, the convex portion 25 and the concave portion 12 are firmly fitted, and the pipe 11 and the fixing cap 21 are not separated thereafter.

  Further, when the fixing cap 21 is inserted into the connection pipe 41, the claw 27 of the outer cylindrical body 23 eventually engages with the locking groove 44 of the connection pipe 41, and the fixing cap 21 and the connection pipe 41 are integrated. Until the claw 27 reaches the locking groove 44, the claw 27 is pushed outward by the elastic deformation of the outer cylinder 23, and the claw 27 moves while contacting the outer peripheral surface of the connecting pipe 41. become.

  When the series of operations is completed, the pipe 11 and the connecting pipe 41 are integrated through the fixing cap 21 as shown in FIG. At this time, the tip of the pipe 11 reaches the intermediate portion 43 of the connection pipe 41, and the pipe 11 is also supported by the intermediate portion 43, and durability when a bending moment acts on the pipe 11 is reached. Is excellent. In addition, since the wedge part 13 is formed in the front-end | tip of the pipe 11, the approach to the intermediate part 43 is smooth. As described above, in the present invention, the fitting is used in various places such as the outer circumferential surface of the pipe 11 and the inner circumferential surface of the inner cylindrical body 22, but the boundary surface is slightly small so as not to restrict the mutual movement in each place. It is assumed that a clear gap is secured. The O-ring 31 is sandwiched between the pipe 11 and the connecting pipe 41, and the gap between the two is completely closed, so that the fluid inside does not leak.

  2 shows a structure different from that of FIG. 1 with respect to the locking portion and the locked portion. FIG. 2 (A) is an overall perspective cross-sectional view, and FIG. 2 (B) is a view as seen from the BB direction. FIG. 2C shows the connecting pipe 41 viewed from the CC direction. 2 (B) and 2 (C) indicate the end face of the article. In this figure, a claw 27 similar to that of FIG. 1 is formed on the fixed cap 21, and a locking groove 44 is formed on the connecting pipe 41. Unlike FIG. 1, the locking groove 44 is not annular but limited to a certain range. A guide groove 45 extending in the axial direction is formed from the end surface of the connection pipe 41 toward the locking groove 44. The guide groove 45 is for moving the claw 27 toward the locking groove 44, and has a depth that is the same as the locking groove 44 and a width that allows the claw 27 to pass smoothly. Together with the groove 44, it is arranged in an L shape.

  When the fixing cap 21 is inserted into the connection pipe 41, the pipe 11 is first inserted into the fixing cap 21, and then the phases of the claw 27 of the fixing cap 21 and the guide groove 45 of the connection pipe 41 are matched, and then the fixing cap 21 is inserted. Next, the claw 27 is moved along the guide groove 45, and when the claw 27 reaches the back of the guide groove 45, the fixing cap 21 is rotated to guide the claw 27. The groove 45 is moved to the locking groove 44. As a result, the fixing cap 21 is integrated with the connection pipe 41. Thereafter, the fixing cap 21 can be removed by intentionally rotating the fixing cap 21 and returning the claw 27 to the guide groove 45.

  FIG. 3 shows the shape of each component based on the actual design drawing. FIG. 3A shows the fixing cap 21 alone, FIG. 3B shows the connecting pipe 41 alone, and FIG. It is the pipe 11 alone. The left side of FIG. 3A is a state in which the side plate 24 of the fixing cap 21 is directed upward, and the right side is a state in which this is inverted upside down. The convex portion 25 is formed near the middle of the inner cylindrical body 22, and the slot 26 extends to all of the inner cylindrical body 22, the side plate 24, and the outer cylindrical body 23, and can be divided by applying an external force. Can be elastically deformed. In addition, the two claws 27 are arranged so as to face each other. Next, with respect to the connecting pipe 41 shown in FIG. 3B, the guide groove 45 is formed obliquely and is structured to be attached and detached while rotating the fixing cap 21. Therefore, it is necessary to force the fixing cap 21 to be drawn. Less labor. As shown in the figure, the actual locking groove 44 and the guide groove 45 have a slightly complicated shape to prevent the fixing cap 21 from being detached. Further, a disc-shaped flange 48 is formed adjacent to the locking groove 44 so that the end face of the fixed cap 21 can be covered. In addition, the pipe 11 shown in FIG. 3C is not limited as long as the concave portion 12 is formed, and there is no problem even if the step portion 14 is formed in the middle to change the diameter as shown in the left side of the figure. Instead, it may be a simple cylindrical shape as shown on the right side of the figure.

  4 shows a process of integrating the components shown in FIG. 3, FIG. 4A shows a state in which the components are arranged in a row, and FIG. 4B shows a state in the middle of integration. FIG. 4C shows a state where the integration is finished. As shown in FIG. 4A, the pipe 11 is inserted toward the inner cylinder 22 of the fixed cap 21, and the O-ring 31 is inserted into the fixed cap 21. Next, as shown in FIG. 4B, the fixing cap 21 is inserted into the connection pipe 41. At this stage, since the pipe 11 is not yet inserted, the fixing cap 21 and the connection pipe 41 are completely integrated. It is not possible. When the pipe 11 is inserted into the fixing cap 21, the concave portion 12 of the pipe 11 eventually coincides with the convex portion 25 of the inner cylinder 22, and the stepped portion 14 of the pipe 11 contacts the side plate 24 of the fixing cap 21. When the fixing cap 21 is further rotated, the fixing cap 21 is drawn into the connecting pipe 41 by the guide groove 45, and finally the end surface of the fixing cap 21 contacts the flange 48 as shown in FIG. Thus, the pipe 11 and the connecting pipe 41 are integrated. In this state, since the distal end portion of the connection pipe 41 enters between the inner cylinder body 22 and the outer cylinder body 23 of the fixing cap 21, the pipe 11 and the fixing cap 21 are firmly integrated.

  FIG. 5 shows the process of integrating the components shown in FIG. 3 in cross section, FIG. 5 (A) in the middle of integration, and FIG. 5 (B) in the state after integration. is there. In addition, the pipe 11 shown in this figure has the level | step-difference part 14 from which an outer diameter changes in the middle. 5A, the upper side is a perspective sectional view and the lower side is a longitudinal sectional view. In this state, the pipe 11 has already been inserted into the fixed cap 21, and the projection In addition to fitting the portion 25 and the recessed portion 12, the stepped portion 14 is in contact with the side plate 24 of the fixed cap 21. Further, the distal end of the connection pipe 41 enters the outer cylinder body 23 of the fixed cap 21, but is not in contact with the inner cylinder body 22.

  When the fixing cap 21 is further inserted into the connection pipe 41 from the state of FIG. 5A, the pipe 11 and the connection pipe 41 are finally integrated as shown in FIG. 5B. 5B, the upper side is a perspective sectional view, and the lower side is a longitudinal sectional view. Thus, since the tip of the connecting pipe 41 is sandwiched between the inner cylinder body 22 and the outer cylinder body 23 of the fixing cap 21, the deformation of the fixing cap 21 is restricted and the pipe 11 does not come off. Further, an O-ring 31 is interposed between the outer peripheral surface of the pipe 11 and the inner peripheral surface of the connection pipe 41, so that the internal fluid does not leak out.

  6 is a cross-sectional view showing the process of integrating the components shown in FIG. 3 in the same manner as FIG. 5, FIG. 5 (A) is in the middle of integration, and FIG. 5 (B) is integrated. It is the state which finished. However, the pipe 11 shown in this figure does not have a stepped portion 14 unlike FIG. In the present invention, as shown in this figure and the like, the pipe 11 only needs to have a concave portion 12 formed on the outer peripheral surface, and is extremely versatile. In addition, the convex portion 25 of the fixed cap 21 fits into the concave portion 12. , It can strongly resist the tensile load. Further, since the outer peripheral surface in the vicinity of the tip of the pipe 11 is in contact with the inner peripheral surface of the connecting pipe 41, it is possible to counter the bending moment acting on the pipe 11.

  FIG. 7 shows an application example of the present invention. FIG. 7 (A) shows a form in which the connecting pipe 41 is integrated with the manifold 32, and FIG. 7 (B) shows that the fixing cap 21 is connected to both sides of the connecting pipe 41. It is a form to do. The present invention aims to connect the pipe 11 and the connecting pipe 41 as shown in FIG. 1 and the like, but the specific form of the connecting pipe 41 is free. Therefore, as shown in FIG. 7A, the connecting pipe 41 can be integrated with the block-like manifold 32, and piping work such as hydraulic equipment can be efficiently performed. Moreover, as shown in FIG. 7B, the pipes 11 can be attached to both ends by forming the introduction portions 42 and the locking grooves 44 on both sides of the connection pipe 41, and as a union that integrates the two pipes. It can also fulfill the functions.

  FIG. 8 is a perspective cross-sectional view showing a configuration example when a flexible hose 16 is used as a pipe as in the invention of claim 3, and (A) is a state in which each component is separated, (B) is a state in which the pipe 16 is incorporated in the fixed cap 21, and (C) is a state in which the whole is connected. In the form shown in FIG. 1 and the like, the pipe 11 is fixed by fitting the convex portion 25 and the concave portion 12, but in the case of the hose 16, such a principle cannot be realized because of high flexibility. However, a hard auxiliary pipe 46 using a metal pipe or the like is inserted into the hose 16 and the hose 16 is sandwiched between the auxiliary pipe 46 and the convex part 25 of the fixing cap 21 so that the convex part 25 is attached to the hose 16. Since it bites in, the hose 16 does not fall out. The auxiliary pipe 46 can be formed integrally with the connection pipe 41 as shown in this figure, but is not limited to this form, and a metal pipe that functions as the auxiliary pipe 46 is included in the pipe 16. In addition, the fixing cap 21 and the connecting pipe 41 can be the same as those shown in FIG. In addition, in order to secure the sandwiching of the hose 16, the auxiliary pipe 46 may be formed with a curved portion 47 that is paired with the convex portion 25.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective sectional view which shows the basic principle of this invention, (A) is in the state which isolate | separated each component, (B) is the state which incorporated the pipe in the fixed cap, (C) is the state in which the whole was connected. It is. FIG. 2 shows a structure different from that of FIG. 1 in connection with the fixing cap and the connecting pipe, (A) is a perspective sectional view of the whole, (B) is a fixing cap viewed from the BB direction, and (C) is C It is a connecting pipe viewed from the -C direction. The shaded areas in (B) and (C) indicate the end face of the article. It is a perspective view which shows the shape of each component based on an actual design drawing, (A) is a fixed cap single-piece | unit, (B) is a connection pipe single-piece | unit, (C) is a pipe single-piece | unit. It is a perspective view which shows the process of integrating each component shown in FIG. 3, (A) is the state which arranged each component in a line, (B) is the state in the middle of integration, (C) is It is in a state where the integration is finished. The process of integrating each component shown in FIG. 3 is shown in cross section, (A) is a state in the middle of integration, and (B) is the state which completed integration. The pipe shown in the figure has a step portion whose outer diameter changes along the way. Like FIG. 5, the process which integrates each component shown in FIG. 3 is shown with the cross section, (A) is the state in the middle of integration, (B) is the state which completed integration. However, unlike the pipe shown in FIG. 5, the pipe shown in FIG. The application example of this invention is shown, (A) is a form which integrated the connection pipe | tube with the manifold, (B) is a form which connects a fixing cap to the both sides of a connection pipe | tube. It is a perspective sectional view showing a configuration example when a flexible hose is used as a pipe, (A) is a state where each component is separated, (B) is a state where the pipe is incorporated in a fixed cap, (C) is the state where the whole was connected.

11 Pipe 12 Recess 13 Wedge 14 Step 16 Pipe (Hose)
21 Fixed cap 22 Inner cylinder 23 Outer cylinder 24 Side plate 25 Convex part 26 Slot 27 Claw (locking part)
31 O-ring 32 Manifold 41 Connecting pipe 42 Introduction part 43 Intermediate part 44 Locking groove (locked part)
45 Guide groove 46 Auxiliary pipe 47 Bending part 48 Flange

Claims (5)

A pipe (11), a connecting pipe (41), and a fixing cap (21) for interposing between the pipe (11) and the connecting pipe (41) to couple them,
On the outer peripheral surface near the end of the pipe (11), a recess (12) is formed in an annular shape,
An introduction portion (42) having an inner diameter larger than the outer diameter of the pipe (11) is formed at the end of the connection pipe (41).
The fixing cap (21) includes an inner cylinder (22) fitted between the outer peripheral surface of the pipe (11) and the introduction portion (42) of the connection pipe (41), and an outer peripheral surface of the connection pipe (41). The inner cylinder (22) includes an outer cylinder (23) that surrounds, and a side plate (24) that connects the end of the inner cylinder (22) and the end of the outer cylinder (23). A slit (26) is formed for elastically expanding the inner cylinder (22), the inner diameter of the inner cylinder (22) is equal to the outer diameter of the pipe (11), and the outer diameter of the inner cylinder (22) is the introduction portion. The inner diameter of the outer cylinder (23) is equal to the outer diameter of the connecting pipe (41), and the inner diameter of the inner cylinder (22) is engaged with the recess (12). The convex part (25) is formed in an annular shape,
A connecting structure for a pipe, wherein the fixing cap (21) and the connecting pipe (41) are provided with a locking portion on one side and a locked portion on the other side in order to integrate both.   The pipe connection structure according to claim 1, wherein an O-ring (31) is sandwiched between the outer peripheral surface of the pipe (11) and the introduction portion (42) of the connection pipe (41). A flexible pipe (16), a connecting pipe (41), and a fixing cap (21) for interposing and coupling the pipe (16) and the connecting pipe (41); An auxiliary pipe (46) inserted into the end of the pipe (16),
An introduction portion (42) having an inner diameter larger than the outer diameter of the pipe (16) is formed at the end of the connection pipe (41).
The fixing cap (21) includes an inner cylinder (22) that fits between the outer peripheral surface of the pipe (16) and the introduction portion (42) of the connection pipe (41), and an outer peripheral surface of the connection pipe (41). The inner cylinder (22) includes an outer cylinder (23) that surrounds, and a side plate (24) that connects the end of the inner cylinder (22) and the end of the outer cylinder (23). A slit (26) for elastically expanding the inner cylinder (22 ) is formed , the outer diameter of the inner cylinder (22) is equal to the inner diameter of the introduction part (42), and the inner diameter of the outer cylinder (23) is the connecting pipe. The outer diameter of (41) is equal to the outer diameter of the inner cylinder (22), and a convex part (25) for pressing the auxiliary pipe (46) and the pipe (16) is formed in an annular shape.
A connecting structure for a pipe, wherein the fixing cap (21) and the connecting pipe (41) are provided with a locking portion on one side and a locked portion on the other side in order to integrate both.   The locking portion is a claw (27) formed on the inner peripheral surface of the outer cylinder (23) of the fixed cap (21), and the locked portion is formed on the outer peripheral surface of the connection pipe (41). The pipe connection structure according to claim 1, 2, or 3, characterized in that it is a locking groove (44) formed and meshed with the claw (27).   The pipe connection structure according to claim 4, wherein a guide groove (45) is formed between the end of the connection pipe (41) and the locking groove (44).

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