JP5320883B2 - Biting type pipe connection structure, valve, biting type pipe fitting and refrigeration system - Google Patents

Description

  The present invention relates to a bite type pipe connection structure, and more particularly to a bite type pipe connection structure provided with a partition lid for closing a pipe connection port. The present invention also relates to a valve, a bite type pipe joint, and a refrigeration apparatus using such a bite type pipe connection structure.

  For bite type fittings used in piping systems such as refrigerant piping of refrigeration equipment, hot water supply piping and water supply piping of hot water equipment, the opening of the fitting should be sealed when performing an airtight test or pressure test before connecting the piping. Need to keep. In addition, in bite type pipe fittings used in such piping systems, it is necessary to keep the opening of the pipe fitting in a sealed state in order to prevent dust and moisture from entering before pipe connection during transportation and the like. There is. For this reason, in Patent Document 1, in order to close the pipe connection port of the pipe joint, a bite type pipe joint in which a partition cover is detachably attached to the pipe connection port of the pipe joint has been proposed.

  The bite type pipe connection structure in this bite type pipe joint will be described with reference to FIGS. FIG. 12 is a cross-sectional view of the bite type pipe joint. FIG. 12A shows a state at the start of pipe connection, and FIG. 12B shows a state when the pipe connection is completed. Moreover, FIG. 13 is sectional drawing of the bite-in type pipe connection structure, Comprising: The state which attached the partition cover without connecting piping is shown.

  As shown in FIG. 12, the conventional bite type pipe connection structure includes a joint body 110 attached to a connected device to which the pipe 100 is to be connected, and a coupling member (screw jointed to the joint body 110). A nut (in Patent Document 1) 120 and a ferrule (sleeve in Patent Document 1) 130 sandwiched between the joint body 110 and the coupling member 120 are provided. The joint body 110 has a male screw portion 111 for screwing the coupling member 120, and a pipe insertion port (joining hole in Patent Document 1) 112 into which the pipe 100 to be connected to the axial center of the male screw portion 111 is inserted. I have. Further, the joint body 110 has a cam surface (guide surface in Patent Document 1) 113 for bringing the tapered surface 131 formed on the outer peripheral surface of the ferrule 130 at the inlet portion of the pipe insertion port 112 into close contact. . On the other hand, the coupling member 120 is formed in a cylindrical member in which a female screw portion 121 to be screwed to the male screw portion 111 is formed on the inner peripheral surface, and a pressing surface 122 that presses the rear end surface of the ferrule 130 on the inner surface thereof. Is formed.

  Further, as shown in FIG. 13, the bite type pipe joint has a partition lid 140 that is sandwiched between the joint body 110 and the coupling member 120 so as to close the pipe insertion port 112 before the pipe connection. It has.

The partition lid 140 is made of resin, and includes a disc-shaped blocking wall portion (a fitting portion in Patent Document 1) 141 fitted into the hole portion of the pipe insertion port 112 at the tip, and the blocking wall portion. A contact surface 142 pressed against the cam surface 113 is provided on the outer peripheral side of 141. Further, the partition lid 140 has a cylindrical portion 143 that extends from the contact surface 142 to the pressing surface 122 of the coupling member 120 that presses the rear end surface of the ferrule 130, and forms a contact surface 142. A space for accommodating the ferrule 130 is formed in the interior from the first portion to the cylindrical portion 143.
JP 2007-162928 A

  By the way, in such a partition lid | cover 140, the force which acts on the disk shaped obstruction | occlusion wall part 141 becomes large compared with the force which acts on another wall part. However, if the wall thickness of the blocking wall portion 141 is increased, the resin may not flow sufficiently to the thin wall portion during the molding process. In addition, there is a problem that the axial thickness of the connecting portion between the blocking wall portion 141 and the other portion is increased, and the axial dimension is increased accordingly. Further, when the thickness of each part is increased in accordance with the blocking wall part 141 that requires the most strength, there is a disadvantage that the dimension increases not only in the axial direction but also in the radial direction.

  The present invention was made paying attention to such a problem existing in the prior art, and in the bite type pipe connection structure provided with the partition cover for closing the pipe insertion port, the most strength is required. An object of the present invention is to increase the strength of the closed wall portion that closes the pipe insertion port to be made without increasing the thickness. Another object of the present invention is to provide a valve, a bite type pipe joint and a refrigeration apparatus using such a bite type pipe connection structure.

The bite type pipe connection structure according to the present invention solves the above-mentioned problem, and is screwed into the joint main body formed with a pipe insertion port into which a pipe to be connected to the shaft center portion is inserted. comprising a coupling member to be assembled, a ferrule which is sandwiched between the joint body and the coupling member, and a partition cover made of resin molding for closing off the pipe insertion port removably when the pipe is not connected, The joint body has a conical cam surface that presses the tip of the ferrule against the inlet portion of the pipe insertion port, and the partition lid includes a blocking wall portion inserted into the pipe insertion port, A cylindrical wall portion that forms a space for storing a ferrule, and a connecting portion between the closed wall portion and the cylindrical wall portion, and an outer surface is perpendicular to the axis of the cam surface of the cam surface and the cam surface inlet portion. A sealing wall that is in intimate contact with a wall, and the closure A plurality of first reinforcing ribs arranged radially in a radial direction so as to reinforce the surface strength of the wall portion; and a plurality of second reinforcing ribs for reinforcing a connecting corner portion between the cylindrical wall portion and the seal wall portion; The plurality of first reinforcing ribs and the plurality of second reinforcing ribs are arranged at the same angular position .
Here, the first reinforcing rib refers to a reinforcing rib disposed radially in a radial direction so as to reinforce the surface strength of the closed wall portion, and the second reinforcing rib refers to the cylindrical wall portion and the seal wall. This refers to a reinforcing rib that reinforces the connecting corner with the part.

According to the bite type pipe joint according to the present invention having such a structural feature, the partition lid has reinforcing ribs formed on the closed wall portion and the connecting corner portion between the cylindrical wall portion and the seal wall portion. Therefore, the strength can be increased without increasing the thickness of each part . Thereby, even if the thickness of each part is unified according to the thickness of the obstructing wall part requiring the strongest strength, the thickness of each part is not increased and the pipe connection structure is not enlarged.

Further, specification outright lid, the closing wall portion inserted into the pipe insertion port, a cylindrical wall portion which space is formed for accommodating the ferrule therein, the connecting portion between the cylindrical wall portion and the closing wall portion In addition, the outer surface has a seal wall portion pressed against a wall surface of the cam surface and the cam surface inlet portion perpendicular to the axis of the cam surface . Therefore, the opening of the pipe insertion port is kept airtight when the seal wall portion of the partition lid is pressed against the wall surface of the cam surface and the cam surface inlet portion perpendicular to the axis of the cam surface. In addition, when the partition lid is mounted, the seal wall portion of the partition lid is pressed against the wall surface perpendicular to the cam surface at the cam surface entrance portion, so that a large force is prevented from acting on the cam surface, and the cam surface is Can be protected. Moreover, since the ferrule storage part is formed inside the cylindrical wall part, the ferrule is stored inside the pipe connection structure without being damaged in a state where the pipe is not connected. This facilitates the management of ferrules.

In the partition lid, the plurality of first reinforcing ribs are arranged radially, and the plurality of first reinforcing ribs and the second reinforcing ribs are arranged at the same angular position. The portions of the first reinforcing rib and the second reinforcing rib serve as a resin passage, and the flow of the resin can be improved.

The first reinforcing rib may be formed so as to protrude to the inside of the cylindrical wall portion on the side opposite to the pressure-receiving surface and to connect the outer peripheral end portion of the reinforcing rib to the seal wall portion. If comprised in this way, while the intensity | strength of an obstruction | occlusion wall part will improve, the intensity | strength of the connection part of an obstruction | occlusion wall part and a seal wall part can be improved.

The first reinforcing rib may be formed so as to protrude toward the pressure receiving surface. In the case of such a configuration, by providing the reinforcing rib, the gap between the blocking wall portion and the ferrule tip end portion is reduced, and the fear that the ferrule is pressed and damaged by deformation of the blocking wall portion is avoided. Can do.

Further, the first reinforcing rib may be formed so as to protrude to the pressure receiving surface side and the counter pressure receiving surface side. In this case, since the reinforcing ribs are formed on both surfaces of the blocking wall portion, the height of the reinforcing ribs can be reduced, and the resin can easily flow to the tip of the reinforcing ribs during the molding process. .

In the partition lid, the first reinforcing ribs may be formed as a plurality of reinforcing ribs extending radially in the radial direction at equal intervals. If comprised in this way , the obstruction | occlusion wall part and the connection part of a cylindrical wall part and a seal wall part can be equally efficiently reinforced by the 1st reinforcement rib and 2nd reinforcement rib which were formed radially. .

  In addition, the partition lid is attached with a gap provided between the blocking wall portion and the tip of the ferrule so as to allow for an axial deformation amount of the blocking wall portion during an airtight test or a pressure resistance test. Preferably it is. In this way, during the airtight test or pressure test of the connected device to which the pipe is to be connected, the blocking wall portion deforms and contacts the ferrule, causing the ferrule to be deformed or the ferrule to be damaged. Disappears.

  Moreover, the valve and pipe joint according to the present invention are characterized in that any one of the pipe connection structures described above is used for a pipe joint part. Therefore, such valves and pipe joints can avoid an increase in shape by increasing the thickness of the blocking wall portion of the partition lid.

  The refrigeration apparatus according to the present invention is characterized in that these valves or pipe joints are used in a refrigerant circuit. Therefore, since the refrigeration apparatus according to the present invention uses the valve and pipe joint as described above, the strength of the partition lid used for the valve and pipe joint without increasing the shape of the valve or pipe joint used in the refrigerant circuit. Can be increased.

According to the bite type pipe connection structure according to the present invention, the partition cover includes a closing wall portion, since the reinforcing rib in the connecting corner between the cylindrical wall and the sealing wall portion is formed, the thickness of each portion it can be increased-strength without thickening. Thereby, even if the thickness of each part is unified according to the thickness of the obstructing wall part requiring the strongest strength, the thickness of each part is not increased and the pipe connection structure is not enlarged. In addition, the opening of the pipe insertion port is kept airtight by the seal wall portion of the partition lid being pressed against the wall surface of the cam surface and the cam surface inlet portion perpendicular to the axis of the cam surface. Further, since the outer surface of the seal wall portion is in close contact with the cam surface and the wall surface of the cam surface inlet portion perpendicular to the axis of the cam surface, the partition lid is tightened when the partition cover is mounted. Even if the force is strong, the cam surface is not damaged. Further, the ferrule is housed inside the pipe connection structure without being damaged when the pipe is not connected. Further, since the plurality of first reinforcing ribs and the second reinforcing ribs are arranged at the same angular position, the portions of the reinforcing ribs become resin passages during resin molding of the partition lid, and the flow of the resin can be improved. .

(Embodiment 1)
Hereinafter, the bite type pipe connection structure according to Embodiment 1 of the present invention will be described with reference to the drawings.

  The pipe connection structure according to the present embodiment is applied to a pipe joint portion in a bite type pipe joint in a refrigerant circuit in the field of a refrigeration apparatus such as an air conditioner, and also in an outdoor unit of a separate type air conditioner. It is applied to the fittings of shut-off valves that connect external communication pipes. FIG. 1 is a partial cross-sectional view of a bite type pipe joint in which such a pipe connection structure is adopted for a pipe joint part, and is a state diagram in which a partition lid is attached when a pipe is not connected. FIG. 2 is a state diagram in which the rear end portion of the ferrule is temporarily fixed to the coupling member and integrated in the bite-in type pipe connection structure. FIG. 3 is a sectional view of the bite-in type pipe joint, and is a state diagram at the start of pipe connection.

  As shown in FIGS. 1 to 3, the bite type pipe connection structure according to the present embodiment is assembled with a joint main body 1 attached to a connected side device to which a pipe is to be connected and screwed into the joint main body 1. The coupling member 2 is formed separately from the coupling body 1 and the coupling member 2, and includes a ferrule 3 that is sandwiched between the coupling body 1 and the coupling member 2. Further, the bite type pipe joint is attached so that a resin-molded partition lid 4 for closing a pipe insertion port 16 to be described later is sandwiched between the joint body 1 and the coupling member 2 when the pipe P is not connected. It has been. In the description of the present specification, when referring to the front-rear direction, the joint body 1 side, for example, the joint body side in FIG. 1, that is, the left side in FIG. 1, is the front side, and the coupling member 2 side, that is, in FIG. The right side is the rear side.

  The joint body 1 is made of brass, and as shown in FIGS. 1 to 3 described above and FIG. 4 which is a single body drawing of the joint body, a socket part 12 is formed on the front side of the base part 11, and the base part. A female screw cylinder portion 13 is formed on the rear side of the outer peripheral portion of the outer peripheral portion 11, and a shaft portion 14 that protrudes into a space in the female screw cylinder portion 13 is formed on the rear side of the axial center portion of the base portion 11. On the inner peripheral surface of the female screw cylinder portion 13, a female screw portion 13 a is formed as a screwing portion of the coupling member 2. An annular space portion 15 is formed on the outer peripheral surface of the shaft portion 14 for adjusting the strength of the shaft portion 14 when piping is connected. In addition, two vent holes 15a for preventing internal freezing are formed diagonally at the base end of the annular space 15 (see FIGS. 4A and 4B).

  The outer shape of the base 11 and the internal thread cylinder 13 is integrally formed in a hexagonal nut shape. A pipe insertion port 16 into which the pipe P is inserted is formed in the shaft center part from the base part 11 to the shaft part 14, and the pipe Pa led out from the connected side device is provided in the shaft center part from the base part 11 to the socket part 12. A pipe insertion port 17 to be inserted is formed. Further, a step portion 18 is formed between the pipe insertion port 16 and the pipe insertion port 17 to form a communication hole and regulate the positions of the pipe P and the pipe Pa. The step portion 18 keeps the tip positions of the pipes P and Pa constant by bringing the tip portions of the pipes P and Pa inserted into the pipe insertion ports 16 and 17 into contact with the end surfaces of the step portion 18. In addition, the front end surface of the stepped portion 18 is formed in a tapered shape, leaving the outer shape of the cutting tool during processing.

  A cam surface 19 is formed at the distal end portion of the shaft portion 14, that is, at the inlet portion of the pipe insertion port 16. The cam surface 19 is connected to the pipe insertion port 16 on the front side, and is formed in a conical surface whose diameter increases toward the rear side (the coupling member 2 side). Further, the cam surface 19 has a larger expansion angle θ2 in the vicinity connected to the front-side pipe insertion port 16 than the expansion angle θ1 of the conical portion on the inlet side, that is, the rear side (coupling member 2 side). (See FIG. 4B).

  The coupling member 2 is made of brass, and as shown in FIGS. 1 to 3 and FIG. 5, which is a single drawing of the coupling member, a pipe through hole 21 is formed through which the pipe P penetrates the shaft center. A disk-shaped slit 22 having a radial cut is formed so as to bisect the coupling member 2. And the pipe connection part 23 which comprises a pipe connection mechanism while screwing together with the joint main body 1 at the joint main body side of the disk shaped slit 22 is formed, and is gripped with a general fastening tool on the anti-joint main body side of the disk shaped slit 22. A grip portion 24 is formed so as to be capable of being made. The axial position of the disc-shaped slit 22 is substantially the same as the position of the end face on the coupling member side of the joint body 1 when the coupling member 2 is fastened to the joint body 1 and the pipe connection work is completed. Is arranged (see FIG. 8).

  On the outer periphery of the pipe connecting portion 23, a male screw portion 23 a is formed as a screwing portion that is screwed into the female screw portion 13 a of the joint body 1. The outer shape of the gripping portion 24 is formed in a hexagonal nut shape so that it can be gripped with a general fastening tool. A tubular connecting portion 26 that connects the tube connecting portion 23 and the gripping portion 24 is formed by a thin tubular portion between the disc-shaped slit 22 and the pipe through hole 21. The tubular connecting portion 26 is designed to have such a strength that it can be cut when the rotational torque for tightening the gripping portion 24 increases to the value at the time of completion of the pipe connection.

  A part of a temporary fixing mechanism for temporarily fixing the rear end portion of the ferrule 3 is formed at the end of the joint main body of the pipe connecting portion 23. That is, a concave portion 27 is formed at the joint main body side end of the pipe connecting portion 23 (see FIG. 5B), and the back end surface of the concave portion 27 is formed as a pressing surface 28 that presses the ferrule 3. The pressing surface 28 is formed in an inclined surface whose axial center side extends rearward. An annular protrusion 29 that is radially inward is formed at the entrance of the recess 27. The end surface of the protrusion 29 is formed in an inclined surface 29a having a diameter that increases forward (see FIGS. 2B and 5B). The inclined surface 29a is provided so that an annular protrusion 35 formed at the rear end portion of the ferrule 3 described later can be easily press-fitted. An annular enlarged diameter portion 29 b is formed between the inward projection 29 and the pressing surface 28.

  Further, on the surface of the pipe connecting portion 23 on the side opposite to the joint body, four engaging holes having a circular cross section and a predetermined depth are provided as engaging portions that engage with engaging protrusions 64 of a dedicated tool 60 described later. A part 51 is formed. The gripping portion 24 is formed with a processing hole 52 for enabling the engagement hole portion 51 to be processed from the anti-joint body side of the gripping portion 24. The machining holes 52 are machined at positions opposite to the engagement hole portions 51, and four are formed at equal intervals on a predetermined circumference as shown in FIG.

  The ferrule 3 is made of brass, and is an independent ferrule formed separately from the joint body 1 and the coupling member 2 as shown in FIGS. 1 to 3 and FIG. 6 which is a single drawing of the ferrule. is there. The ferrule 3 is an annular object having an insertion hole 31 through which the pipe P is inserted, and the outer peripheral surface of the front portion 32 is formed as a tapered tapered surface 33 when viewed in a cross section cut in the axial direction. Further, the outer peripheral surface of the rear portion 34 is formed as a cylindrical parallel surface substantially parallel to the axis.

  The tapered surface 33 constituting the outer peripheral surface of the front portion 32 is formed so that the inclination angle with respect to the axis is smaller than the expansion angle θ1 of the conical portion on the rear side of the cam surface 19. Accordingly, the tip of the ferrule 3 is easily bent, and the contact area between the cam surface 19 and the tapered surface 33 is increased.

  Further, a radially outward annular protrusion 35 is formed at the rear end of the ferrule 3 as a part of the temporary fixing mechanism of the ferrule 3. The outer peripheral end surface of the protrusion 35 is formed on an inclined surface 35a whose diameter decreases rearward so that the protrusion 35 of the rear portion 34 of the ferrule 3 can be easily pressed into the enlarged diameter portion 29b of the coupling member 2 ( (Refer FIG.2 (b)). The outer diameter of the maximum diameter portion of the protrusion 35 is formed slightly larger than the minimum inner diameter of the radially inward annular protrusion 29 of the coupling member 2 described above, and the inward protrusion due to press-fitting deformation. 29 and is pushed into the enlarged diameter portion 29b. Further, the axial dimension of the protrusion 35 is formed to be slightly smaller than the axial dimension of the above-described enlarged diameter portion 29b.

  The temporary fixing mechanism of the ferrule 3 is configured as described above at the joint main body side end face of the pipe connecting portion 23 and the rear end portion of the ferrule 3. Thereby, the rear end portion of the ferrule 3 can be detachably attached to the concave portion 27 formed on the side surface of the joint body 1 of the coupling member 2 and can be transported while being temporarily fixed to the coupling member 2 and integrated. And it is comprised so that attachment with respect to the coupling main body 1 is possible.

  The rear end surface of the ferrule 3 is a pressure receiving surface that is pressed by the pressing surface 28. In addition, the rear end surface of the ferrule 3 is formed with an inclined surface 34a whose front side is the center side on the central axis side and a vertical surface 34b perpendicular to the central axis is formed on the outer peripheral side. Further, a corner portion formed by the intersection of the inclined surface 34a and the insertion hole 31 forms a rear edge portion.

  Further, the ferrule 3 is formed with a first notch 36 and a second notch 37 which are cut portions cut in the outer peripheral direction from the inner peripheral surface of the insertion hole 31. The first notch 36 is formed at the tip end in the axial direction, and the second notch 37 is formed later in the axial direction. The first notch 36 is for facilitating deformation of the tip portion in front of the first notch 36. The first notch 36 has a right-angled triangular cross-section cut in the axial direction, and a corner formed by the intersection of the rear cut end surface and the insertion hole 31 forms a front edge portion.

  The second notch 37 is formed at a position from the rear end surface between the first notch 36 and the rear end surface in the axial direction. The second notch 37 is formed in a substantially triangular shape having a short side on the outer peripheral side. As shown in FIGS. 2 and 6, the ferrule 3 has a thin portion 38 formed between the second notch 37 and the outer peripheral surface of the ferrule 3, and an inclined surface 34a is formed on the rear end surface. The front and rear portions are easily bent to the axial center side by making the thin portion 38 like a hinge. As a result, the taper surface 33 of the front portion 32 of the ferrule 3 is easily brought into close contact with the cam surface 19, and the rear edge portion formed at the rear end of the ferrule 3 is easy to bite into the pipe P.

  The ferrule 3 formed as described above is integrated by temporarily fixing the rear end portion thereof to the coupling member 2 at the stage of conveyance and management as a part. This temporarily fixed state diagram is shown in FIG. In order to achieve such a temporarily fixed state, the rear end portion of the ferrule 3 is pressed against the concave portion 27 of the coupling member 2 with the central axis of the ferrule 3 and the central axis of the coupling member 2 aligned. Thereby, the inclined surface 35a of the outer peripheral end surface of the protrusion 35 of the ferrule 3 and the inclined surface 29a of the inner peripheral end surface of the inwardly protruding portion 29 of the coupling member 2 come into contact, and then the rear end portion of the ferrule 3 is deformed. It is press-fitted while. Then, the protrusion 35 of the ferrule 3 is slightly reduced in diameter and inserted into the enlarged diameter portion 29b. Since the projection 35 returns to the free state after being inserted into the enlarged diameter portion 29b, the outer diameter is slightly larger than the inner diameter of the inward projection 29 of the coupling member 2, and the ferrule 3 is temporarily fixed and the transfer work is performed. At this time, the temporarily fixed state of the ferrule 3 is maintained. However, the inwardly protruding portion 29 and the outwardly protruding portion 35 are slightly caught and can be removed.

Next, the partition lid 4 that characterizes the present invention will be described with reference to FIGS. 1 and 7.
The partition lid 4 hermetically closes the inlet portion of the pipe insertion port 16 of the joint body 1 when the pipe P is not connected, and is integrally molded with resin. The partition lid 4 includes a disc-shaped blocking wall portion 41 that closes the pipe insertion port 16 and a cylindrical wall portion in which a space in which the ferrule 3 can be stored is formed with the blocking wall portion 41 as a side wall on one end side. 42. Further, the partition lid 4 forms a connecting portion between the blocking wall portion 41 and the cylindrical wall portion 42, and an outer surface thereof is in close contact with a wall surface perpendicular to the cam surface 19 and the axial center of the inlet portion of the cam surface 19. A seal wall 43 is provided. In this embodiment, the wall surface perpendicular to the axial center of the inlet portion of the cam surface 19 is the end surface of the shaft portion 14.

  The seal wall 43 is formed with a conical wall 43a having an outer surface along the cam surface 19 on the axial center side, and a donut-shaped vertical wall 43b perpendicular to the axial center is formed on the outer peripheral side. The axial center side of the wall portion 43 a is connected to the outer peripheral portion of the blocking wall portion 41, and the outer peripheral side of the vertical wall portion 43 b is connected to the end portion of the cylindrical wall portion 42 at right angles. Further, the outer peripheral end surface of the blocking wall portion 41 and the outer surface of the conical wall portion 43 a are formed and connected to an inclined surface having a constant angle along the cam surface 19.

  Further, a large gas pressure acts on the joint body side surface of the blocking wall portion 41 formed in this way from the inside of the pipe insertion port 16 during an airtight test or a pressure test. For this reason, the blocking wall portion 41 expands and deforms toward the coupling member 2. For this reason, it is sufficient to increase the thickness of the wall portion of the portion requiring strength, including the blocking wall portion 41. However, if the thickness of the blocking wall portion 41 or the like is increased, the axial dimension of the branch pipe connection structure is increased. Becomes larger. Further, if the wall thickness is partially increased, the resin may hardly flow during resin molding.

  For this reason, in this embodiment, as shown in FIG. 7, eight reinforcing ribs 45 are formed radially from the center on the surface of the closing wall 41 on the coupling member 2 side. Further, the outer peripheral end surface of the reinforcing rib 45 is connected to the conical wall portion 43a of the seal wall portion 43 described above. As a result, the strength of the blocking wall portion 41 itself is improved, and the connection strength between the blocking wall portion 41 and the conical wall portion 43a is improved. In addition, one piece is connected to the vertical wall portion 43b at a corner portion where the vertical wall portion 43b of the seal wall portion 43 and the cylindrical wall portion 42 are connected in an intersecting manner (in this case, an orthogonal shape). A triangular reinforcing rib 46 is connected to the cylindrical wall portion 42 at the same angular position as the radial reinforcing rib 45 described above. The triangular reinforcing ribs 46 are for improving the strength of the corners connected in a crossing manner between the vertical wall portion 43 b and the cylindrical wall portion 42.

  In this pipe connection structure, the partition lid 4 configured in this way is mounted as shown in FIG. 1 as follows. First, the joint main body 1 is attached to a predetermined location in a connected device to which the pipe P is to be connected. A target to which the joint body 1 is attached is a pipe connection port of various devices such as a pipe and a shut-off valve. Then, the ferrule 3 is integrated with the coupling member 2 by temporarily fixing the rear end portion of the ferrule 3 to the coupling member 2 as described above.

  Next, the outer surface of the conical wall 43a in the seal wall 43 is brought into contact with the cam surface 19 of the joint main body 1 attached to the connected device, and the vertical wall 43b in the seal wall 43 is on the joint main body side. The side surface abuts against a wall surface perpendicular to the axial center of the inlet periphery of the cam surface 19 (that is, the end surface of the shaft portion 14 in this embodiment). Next, the coupling member 2 is screwed into the joint body 1 while the end face of the pipe connecting portion 23 is brought into contact with the end face of the cylindrical wall portion 42 of the partition lid 4. Thereby, the partition lid 4 is configured such that the outer surface of the conical wall portion 43a of the seal wall portion 43 is pressed against the cam surface 19 and the side surface of the vertical wall portion 43b of the seal wall portion 43 on the joint main body side is the end surface of the shaft portion 14. Pressed. Furthermore, the joint body side end surface of the cylindrical wall portion 42 is pressed against the joint body side end surface of the pipe connection portion 23. When the partition lid 4 is thus sandwiched between the joint body 1 and the coupling member 2, the pipe insertion port 16 is closed by the partition lid 4. The airtightness that closes the pipe insertion port 16 is maintained by the close contact between the cam surface 19 and the end surface of the shaft portion 14 and the outer surface of the seal wall portion 43. Further, when the partition lid 4 is sandwiched between the joint main body 1 and the coupling member 2, the ferrule 3 is located inside the cylindrical wall portion 42, and the outside is covered without contacting the partition lid 4. Note that the blocking wall 41 of the partition lid 4 may be deformed so as to bulge outward due to gas pressure, that is, toward the coupling member, during an airtight test or a pressure resistance test of a connected device to which the pipe P is connected. Inevitable. Therefore, in order to prevent the ferrule 3 from being pressed by the closing wall 41 even in such a case, an expansion gap S (see FIG. 1) is provided between the closing wall 41 and the tip of the ferrule 3. Is provided.

Next, a description will be given of a pipe connection method for changing the pipe connection state as shown in FIG. 8 from the state in which the partition lid 4 shown in FIG. 1 is mounted.
When connecting the pipe P with the joint body 1 and the coupling member 2, first, the fastening of the coupling member 2 to the joint body 1 is loosened and the partition lid 4 is removed. Next, the pipe P to be connected is inserted into the pipe through hole 21 of the coupling member 2 to which the ferrule 3 is temporarily fixed and the insertion hole 31 of the ferrule 3 so that the coupling member 2 is sheathed on the pipe P. In this exterior work, the coupling member 2 in a state in which the ferrule 3 is temporarily fixed may be externally mounted on the pipe P as a state separated from the joint body 1, or the coupling member 2 in a state in which the ferrule 3 is temporarily fixed The pipe P may be inserted from the rear of the coupling member 2 while being loosely screwed into the main body 1. Then, the distal end portion of the pipe P is inserted into the pipe insertion port 16 through the insertion hole 31 of the ferrule 3, and the coupling member 2 is attached to the joint body 1 in a state where the distal end is brought into contact with the stepped end surface of the step portion 18. Conclude. By this screwing, the rear end portion of the ferrule 3 comes into contact with the pressing surface 28 as shown in FIG.

  When the coupling member 2 is continuously tightened from this state by hand, the front end portion of the ferrule 3 in front of the first notch 36 is inserted in a wedge shape between the pipe P and the pipe insertion port 16, and the pipe P is temporarily fixed. When the coupling member 2 is further tightened, the axial center side of the pressing surface 28 is formed as an inclined surface that extends rearward, so that the front and rear portions of the ferrule 3 are easily bent toward the axial center side. . Therefore, the ferrule 3 is inclined so that the front edge portion bites into the pipe P around the thin portion 38 at the front portion of the second notch 37, and the thin portion 38 is centered at the rear portion of the second notch 37. Then, the rear edge of the rear end is inclined so as to bite into the pipe P (see FIG. 8).

  Thus, when the biting of the front edge portion and the rear edge portion in the ferrule 3 reaches a predetermined amount, as shown in FIG. 8, the end portion of the internal thread cylinder portion 13 of the joint body 1 and the joint body of the disk-like slit 22 The side surface is approximately the same. Further, when the coupling member 2 is tightened to such a state, the rotational torque reaches a predetermined value, the tubular connecting portion 26 is cut, and the grip portion 24 in a state of protruding from the female screw cylindrical portion 13 of the joint body 1 is provided. Disconnected. Thereby, the connection work of the coupling member 2 is completed.

  The pipe connection part fastened as described above cannot be loosened by anyone because the gripping part 24 is cut, but this pipe connection can be achieved by using a dedicated tool as shown in FIG. The part can be loosened.

  As shown in FIG. 9, the dedicated tool 60 has a handle 62 attached to a semi-disc-shaped base 61. The inner peripheral radius of the semicircular hole 63 of the base portion 61 is formed to be slightly larger than the pipe P. Further, three columnar engaging protrusions that can be engaged with any three adjacent four of the four engaging hole portions 51 of the pipe connecting portion 23 on the side surface of the base portion 61 as an engaging portion. 64 is formed.

  Then, the engagement protrusion 64 of the dedicated tool 60 is engaged with any three adjacent engagement holes 51 of the pipe connection portion 23, and a force is applied to the handle 62 of the dedicated tool 60 to form the base portion. By rotating 61, the pipe connection portion 23 can be rotated to loosen the screw connection with the joint body 1, and the pipe P can be removed from the joint body 1. According to this pipe connection releasing method, the pipe P can be released from the connected state without cutting the pipe P, so that the pipe connection releasing work is simplified. Further, the pipe P is removed with the joint body 1 left, and the pipe P is reconnected to the joint body 1 by using the new ferrule 3 by pulling out the ferrule 3 temporarily fixed to the coupling member 2. can do.

According to the bite type pipe connection structure according to the present embodiment including the partition lid 4 configured as described above, the following effects can be achieved.
(1) Since the reinforcing rib 45 is formed on the blocking wall portion 41 that is the portion of the partition lid 4 that requires the most strength, the strength of the blocking wall portion 41 is increased without increasing the thickness of the blocking wall portion 41. Can be increased. Thereby, even if the thickness of each part is unified according to the thickness of the obstructing wall part 41 that requires the most strength, the thickness of each part is not increased, and the pipe connection structure is not enlarged. It will be good.

  (2) Further, the opening of the pipe insertion port 16 is such that the seal wall 43 of the partition lid 4 has the cam surface 19 and the outer peripheral wall surface of the inlet of the cam surface 19, that is, the shaft portion 14 in this embodiment. Airtightness is maintained by being pressed against the end face.

  (3) Since a space for housing the ferrule 3 is formed inside the cylindrical wall portion 42 of the partition lid 4, the ferrule 3 is a pipe without being damaged in a state where the pipe P is not connected. Housed inside the connection structure. This facilitates management of the ferrule 3.

  (4) In addition, the reinforcing rib 45 that reinforces the blocking wall portion 41 of the partition lid 4 protrudes inside the cylindrical wall portion 42 on the side opposite to the pressure-receiving surface, and the outer peripheral end portion of the reinforcing rib 45 is the seal wall portion 43. Therefore, the strength of the blocking wall portion 41 can be improved and the strength of the connecting portion between the blocking wall portion 41 and the seal wall portion 43 can be improved.

  (5) Further, since the reinforcing ribs 45 that reinforce the blocking wall portion 41 are formed in the plurality of reinforcing ribs 45 extending radially in the radial direction, the reinforcing ribs 45 extending radially serve as resin passages during molding, The flow of resin can be improved. Further, the blocking wall portion 41 can be efficiently reinforced by the reinforcing ribs 45 formed radially.

  (6) Since the partition lid 4 has the reinforcing ribs 46 formed inside the corners connecting the cylindrical wall portion 42 and the seal wall portion 43, the connection between the cylindrical wall portion 42 and the seal wall portion 43 is performed. Strength can be improved.

  (7) Since a plurality of reinforcing ribs 46 formed at the corners of the cylindrical wall portion 42 and the seal wall portion 43 are formed at substantially equal intervals in the circumferential direction of the seal wall portion 43, the cylindrical wall portion The connection strength between 42 and the seal wall 43 can be evenly reinforced over the entire circumference.

  (8) Further, the partition lid 4 is attached by providing a gap S between the closing wall 41 and the tip of the ferrule 3 with an expectation of the axial deformation amount of the closing wall 41 during the airtight test. ing. Therefore, at the time of an airtight test or a pressure resistance test of the connected device to which the pipe P is to be connected, the blocking wall portion 41 is deformed and comes into contact with the ferrule 3 to deform the ferrule 3 or damage the ferrule 3. There is nothing.

  (9) The valve and pipe joint using the pipe connection structure according to the present embodiment can avoid an increase in shape by increasing the thickness of the blocking wall portion 41 in the partition lid 4. .

  (10) In addition, a refrigeration apparatus using such a valve or pipe joint in the refrigerant circuit increases the strength of the partition lid used in the valve or pipe joint without increasing the shape of the valve or pipe joint used in the refrigerant circuit. Can be bigger.

(Embodiment 2)
Next, a second embodiment will be described with reference to FIG.
The second embodiment is obtained by changing the reinforcing rib 45 provided on the blocking wall portion 41 of the partition lid 4 in the first embodiment. That is, in this embodiment, a reinforcing rib 451 is provided on the pressure receiving surface side of the closing wall portion 41 in place of the above-described reinforcing rib 45. The dimension of the reinforcing rib 451 from the axial center to the end of the pipe connection structure is such that the end does not contact the cam surface 19 when the partition lid 4 is attached, and the cam surface 19 is easily damaged. Is preventing. Further, by providing the reinforcing rib 451 in this manner, the gap between the blocking wall portion 41 and the tip portion of the ferrule 3 is not reduced.

(Embodiment 3)
Next, Embodiment 3 will be described with reference to FIG.
The third embodiment is obtained by changing the reinforcing rib 45 provided on the blocking wall portion 41 of the partition lid 4 in the first embodiment. That is, in this embodiment, the reinforcing ribs 452 and 453 are provided on the pressure-receiving surface side and the counter-pressure-receiving surface side of the blocking wall portion 41 in place of the above-described reinforcing rib 45. In this case, since the reinforcing ribs are formed on both surfaces of the blocking wall portion 41, the height of the reinforcing ribs 452 and 453 can be made smaller than that of the reinforcing rib 45 or the reinforcing rib 451 described above. . Therefore, the flow of the resin to the tips of the reinforcing ribs 452 and 453 during molding is good.

(Modification)
The above-described embodiments can be modified as follows.
-In the above-mentioned each embodiment, the ferrule 3 is formed separately from the joint body 1 and the coupling member 2, and the rear end of the ferrule 3 is temporarily fixed to the coupling member 2. However, as described in Patent Document 1 described above, a structure that is not temporarily fixed may be used. Moreover, the ferrule 3 is good also as a thing of the structure manufactured integrally with the coupling member 2 and isolate | separating in a fastening process like conventionally well-known.

  In addition, the reinforcing ribs 45, 451.452, and 453 provided on the blocking wall portion 41 of the partition lid 4 have a quadrilateral cross-sectional shape perpendicular to the length direction. This cross-sectional shape is semicircular, trapezoidal, etc. Other shapes may be used.

  In addition, eight reinforcing ribs 45, 451.452, 453 provided on the closing wall portion 41 of the partition lid 4 are formed radially from the center of the closing wall portion 41. The number may be changed as appropriate by appropriately setting.

  Further, the joint main body 1 is provided with the female screw cylinder portion 13 having the female screw portion 13a on the inner peripheral surface, and the male screw portion 23a is provided on the outer periphery of the pipe connecting portion 23 of the coupling member, so that the joint main body 1 and the coupling member 2 are screwed. However, as in Patent Document 1 described above, a threaded structure in which a male thread part is provided in the joint body 1 and a female thread part is provided in the coupling member 2 may be employed.

  In the joint main body 1 that functions as the main body side coupling member, the socket portion 12 has a structure in which the pipe P of the connected device is brazed, but a male screw is formed on the outer periphery of the socket portion 12 to connect the connected device. It is good also as a structure which attaches the coupling main body 1 directly to apparatuses, such as an internal closing valve.

  The coupling member 2 may have a structure that is not divided into the pipe connection portion 23 and the grip portion 24 in the fastening process of the coupling member 2.

  The present invention is applied to a bite type pipe connection structure used for a refrigerant circuit, a water circuit, a gas circuit, etc. in a hot water device such as a refrigeration device, an air conditioner, a water heater, a water supply device, and general production equipment. Can do. Further, the bite type pipe connection structure to which the present invention is applied can be applied to connection between pipes, pipe joints in valves such as shut-off valves, and pipe joints in various other devices. Further, the pipes targeted by the bite type pipe connection structure to which the present invention is applied include metal pipes such as copper pipes and stainless steel pipes as well as resin pipes.

It is a fragmentary sectional view of the bite type pipe connection structure concerning Embodiment 1 of the present invention, and is a state figure to which a partition lid was attached when piping was not connected. In the same bite type pipe connection structure, it is a state diagram in which the rear end portion of the ferrule is temporarily fixed to the coupling member and integrated, where (a) is an overall cross-sectional view and (b) is A in (a). FIG. It is a fragmentary sectional view of the same bite type pipe connection structure, and is a state diagram of pipe connection start. It is a single figure of the joint main part in the bite type pipe connection structure, (a) is a side view, (b) is a BB sectional view in (a). It is a single figure of the coupling member in the same bite type pipe connection structure, (a) is a side view, (b) is a CC sectional view in (a). It is the single drawing of the ferrule in the same bite type pipe connection structure, (a) is a side view, (b) is DD sectional drawing in (a). It is a single figure of the partition lid in the bite type pipe connection structure, (a) is a side view, (b) is an EE sectional view in (a). It is a fragmentary sectional view of the same bite type pipe connection structure, and is a state diagram at the time of pipe connection completion. It is a perspective view of the exclusive tool used for the bite type pipe connection structure. It is sectional drawing of the partition cover in the bite type pipe connection structure which concerns on Embodiment 2 of this invention. It is sectional drawing of the partition cover in the bite type pipe connection structure which concerns on Embodiment 3 of this invention. It is sectional drawing of the conventional bite type pipe connection structure, Comprising: (a) is a state figure at the time of pipe connection start, (b) is a state figure at the time of pipe connection completion. It is sectional drawing of the same bite type pipe connection structure, Comprising: It is the state figure which attached the partition cover in the state which does not connect piping.

Explanation of symbols

  P ... pipe, S ... gap, 1 ... joint body, 2 ... coupling member, 3 ... ferrule, 4 ... partition lid, 11 ... base part, 13 ... female screw cylinder part, 13a ... female screw part, 16 ... pipe insertion port, 19 DESCRIPTION OF SYMBOLS ... Cam surface, 23 ... Pipe connection part, 23a ... Male thread part, 28 ... Pressing surface, 41 ... Blocking wall part, 42 ... Cylindrical wall part, 43 ... Seal wall part, 45, 46, 451, 452, 453 ... Reinforcement rib .

Claims (10)

A joint body formed with a pipe insertion port into which a pipe to be connected to the shaft center part is inserted, a coupling member screwed into the joint body and assembled, and a ferrule sandwiched between the joint body and the coupling member , piping and a partition cover made of resin molding for closing off the removably the pipe insertion port when not connected,
The joint body has a conical cam surface that presses the tip of the ferrule against the inlet of the pipe insertion port,
The partition lid forms a closed wall portion inserted into the pipe insertion port, a cylindrical wall portion that forms a space for storing a ferrule therein, and a connecting portion between the closed wall portion and the cylindrical wall portion. The outer surface is arranged radially in a radial direction so as to reinforce the surface strength of the cam surface and the cam surface inlet portion, the seal wall portion being in close contact with the wall surface perpendicular to the axis of the cam surface, and the blocking wall portion. A plurality of first reinforcing ribs, and a plurality of second reinforcing ribs that reinforce the connecting corners of the cylindrical wall portion and the seal wall portion,
The plurality of first reinforcing ribs and the plurality of second reinforcing ribs are arranged at the same angular position, and the bite type pipe connecting structure. The first reinforcing rib is formed so as to protrude to the inside of the cylindrical wall portion on the side opposite to the pressure-receiving surface, and the outer peripheral end portion of the first reinforcing rib is connected to the seal wall portion. The bite type pipe connection structure according to claim 1 . Said first reinforcing rib, the bite type pipe connection structures according to claim 1, characterized in that it is formed so as to protrude to the pressure receiving surface side. Said first reinforcing rib, the bite type pipe connection structure according to claim 1, characterized in that it is formed so as to protrude to the pressure receiving surface and the counter-pressure surface side. The biting type according to any one of claims 2 to 4 , wherein the partition lid is formed with a plurality of reinforcing ribs in which the first reinforcing ribs extend radially in the radial direction at equal intervals. Pipe connection structure. The partition lid is attached with a gap provided between the blocking wall portion and the tip of the ferrule so as to allow for an axial deformation amount of the blocking wall portion during an airtight test or a pressure test. The bite type pipe connection structure according to any one of claims 1 to 4 . The valve which used the pipe connection structure of any one of Claims 1-6 for the pipe joint part. A bite type pipe joint using the pipe connection structure according to any one of claims 1 to 7 for a pipe joint part. A refrigeration apparatus using the valve according to claim 7 in a refrigerant circuit. A refrigeration apparatus using the bite type pipe joint according to claim 7 in a refrigerant circuit.

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