JP2010048409A - Flareless pipe coupling structure, valve, flareless pipe fitting, and refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flareless pipe coupling structure improved in carry-in cost, management cost and workability of installation work, excelling in workability and preventing a ferrule from coming in partial contact with piping, and a valve, a flareless pipe fitting and a refrigerating device using such a flareless pipe coupling structure. <P>SOLUTION: In the flareless pipe coupling structure, the ferrule 3 is so formed as to be independent of a fitting body and a joint member 2. The fitting body has a female thread tubular section with a female thread section formed in the inner peripheral surface and screwed with the joint member 2, and a cam surface. The joint member 2 has a pipe connection section 23 with a male thread section 23a formed on the outer periphery and screwed with the female thread section. The ferrule 3 is temporarily affixed at its rear end to the fitting body side end of the pipe connection section 23 rotatably and axially movably within a predetermined range, is transportable while being integrated with the joint member 2, and can be assembled in the fitting body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bite type pipe connection structure, and in particular, is formed separately from a joint body, a coupling member that is screwed into the joint body, and the joint body and the coupling member, and is coupled to the joint body. The present invention relates to a bite type pipe connection structure provided with a ferrule sandwiched between members. 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.

  In piping systems such as refrigerant piping for refrigeration equipment, hot water supply piping and water supply piping for hot water equipment, the joint body attached to the connected device that is the connection target of the piping to be connected, and the joint that is externally attached to the piping to be connected A bite type pipe joint provided with a coupling member that is screwed into the main body and assembled is used. As such a bite type pipe joint, one using an independent ferrule (a bite type sleeve) as described in Patent Document 1 has been widely used. However, the ferrule, which is a small part, must be handled as an independent part, so the workability and storage efficiency are poor, the ferrule may be lost, and the ferrule may be damaged during handling. There were some problems.

  For this reason, a ferrule in which a ferrule is integrally formed on a joint body or a coupling member has been developed. As such a thing, there exists a thing which provided the ferrule in the inside of a nut-shaped coupling member like patent document 2, for example. In addition, as described in Patent Document 3, the joint body has a nut shape with a female threaded portion and a cam surface inside, and the coupling member is a member with a male threaded portion, and a ferrule is attached to the tip of the male screw. There is what formed.

Patent Document 4 describes a structure that temporarily holds a ferrule. This structure is shown in FIG. In this structure, as shown in FIG. 19, the joint main body 110 has a male thread portion 111 for screwing the coupling member 120 on the coupling member 120 (referred to as a fastening member in Patent Document 4). In addition, a grip portion 112 (referred to as a jig fitting portion in Patent Document 4) having a regular hexagonal outer shape is formed on the anti-coupling member side. A cam surface 113 (referred to as a rear tapered surface in Patent Document 4) is formed in the shaft center portion. In this bite-in type pipe joint, the coupling member 120 is formed in a cylindrical hexagonal nut shape, and an internal thread portion 121 that is screwed into the external thread portion 111 is formed on the inner peripheral surface. In addition, an inward projection 122 for engaging and temporarily fixing a ferrule 130 (referred to as a tightening ring in Patent Document 4) is formed in the inner part of the cylindrical shape. An outward projection 131 that engages with the inward projection 122 is formed at the rear end portion.
Japanese Patent Laid-Open No. 2003-74768, FIG. JP-T-2004-526911 US Pat. No. 4,224,497 JP 2004-308689 A

  However, in the thing of patent document 2 and patent document 3, since the thickness of the part which connects a ferrule to a coupling main body or a coupling member is thin, there exists a problem that a ferrule will be cut | disconnected during a process, if processing speed is raised. In addition, in the thing of patent document 3, since the ferrule was formed in the back of a cylindrical member, there existed a problem that a processing speed fell further.

  On the other hand, in the thing of patent document 4, since the ferrule 130 is formed separately, there is no problem that a ferrule is cut | disconnected unintentionally during a process like patent document 2 and patent document 3. FIG. However, since the ferrule temporary fixing portion is in the inner part of the cylindrical shape, it is difficult to process the inward protruding portion 122 of the nut temporary fixing portion and the relief hole 123 in the inner portion thereof, and the strength of the blade to be processed becomes weak. There is a problem that processing speed decreases. This processability problem is particularly problematic in pipe joints having a small pipe size. In addition, since the temporary fixing portion is in the cylindrical shape, there is a problem that the axial dimension of the coupling member 120 is increased by a size necessary for the temporary fixing portion. In addition, since the temporary fixing portion is in the inner part of the cylindrical shape, there is a problem that it is difficult to perform the temporary fixing operation by hand. In addition, as in Patent Document 4, when the female screw portion 121 is formed in the coupling member 120 and the ferrule 130 is fixed at the inner part of the cylindrical shape, a threaded portion between the male screw portion 111 and the female screw portion 121; Since the axial distance between the connecting member 120 and the pressing surface 132 of the ferrule 130 increases, there is a problem that the ferrule 130 hits the pipe 140 at the time of fastening.

  The present invention has been made by paying attention to such problems existing in the prior art, and is intended to improve carry-in cost, management cost and assembly workability, has good workability, and has a ferrule. An object of the present invention is to provide a bite type pipe connection structure that does not impinge on the pipe. 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-described problem, and is formed separately from a joint body, a coupling member screwed into the joint body, and the joint body and the coupling member. In addition, in the bite type pipe connection structure provided with a ferrule sandwiched between the joint body and the coupling member, the joint body has an internal thread portion formed on the inner peripheral surface for screwing the coupling member. A female screw cylinder part, a base part forming the side wall of the female screw cylinder part, a pipe insertion port for inserting a pipe to be connected formed in the axial center part of the base part, and a cam formed at the inlet part of the pipe insertion port And the coupling member includes a pipe connection portion formed on the outer periphery of a male screw portion screwed into the female screw portion, and a rear end of a ferrule formed at a joint main body side end portion of the pipe connection portion. A pressing surface that presses the part, and the ferrule An end portion is formed on a tapered surface that is in close contact with the cam surface, and a rear end portion thereof is temporarily fixed so as to be rotatable with respect to the coupling member at the tube connection portion and movable in the axial direction within a predetermined range. In addition, it is configured to be assembled to the joint body while being temporarily fixed to the coupling member and integrated.

  According to the bite type pipe connection structure according to the present invention having such a structural feature, a mechanism for temporarily fixing the rear end portion of the ferrule to the coupling member is formed at the joint main body side end portion of the pipe connection portion. Therefore, the temporary fixing portion can be easily processed, and the ferrule temporary fixing operation can be facilitated. Further, since the axial distance between the threaded portion of the male screw portion and the female screw portion and the pressing surface of the ferrule in the coupling member is close, pressing the ferrule in a one-sided state when pressing the ferrule is avoided. Moreover, since the temporary fixing mechanism is formed by recessing the joint body side end surface of the pipe connecting portion, there is an advantage that the dimension in the axial direction does not increase.

  In addition, the coupling member has a concave portion whose side surface is recessed in the axial direction at the joint main body side end of the pipe connecting portion, and the concave portion is formed with the pressing surface at the back and an inlet. A radially inward protrusion is formed on the portion, and a diameter-expanded portion is formed between the inward protrusion and the pressing surface, and the ferrule has a radially outward protrusion on the rear end. And the outer diameter of the outward projection is larger than the inner diameter of the inward projection of the pipe connecting portion, and the axial length of the projection is larger than the axial length of the enlarged diameter portion. Further, it may be configured such that the outward projecting portion is inserted and held in the enlarged diameter portion via the radially inward projecting portion. With this configuration, the ferrule is temporarily fixed to the joint member side end of the pipe connecting portion so as to be rotatable with respect to the coupling member and movable in the axial direction within a predetermined range, and is temporarily secured to the coupling member. It can be transported while being integrated, and can be assembled to the joint body.

  Further, in this case, the outward protrusion of the ferrule is formed so that the outer diameter thereof is larger than the inner diameter of the inward protrusion of the recess before being inserted into the enlarged diameter portion. You may comprise so that it may be press-fitted in the inward protrusion part, and may be inserted in the said enlarged diameter part. If comprised in this way, it can fix temporarily by pressing the rear-end part of a ferrule to an axial direction with respect to the recessed part of a coupling member.

  Further, instead of being inserted by press fitting as described above, the outward protrusion of the ferrule has an inward protrusion of the recess before the outer diameter is inserted into the enlarged diameter portion. It may be formed smaller than the inner diameter of the concave portion, and after being inserted into the enlarged diameter portion, it may be deformed by being pressed against the pressing surface and larger than the inner diameter of the inwardly protruding portion of the concave portion. If comprised in this way, like the above-mentioned case, it can temporarily fix by pressing the rear-end part of a ferrule to an axial direction with respect to the recessed part of a coupling member. Further, the temporary fixing can be more reliably performed by increasing the pressing force.

  In place of the above configuration, an internal thread is formed on the inner peripheral end surface of the inward protruding portion of the recess, and the outer peripheral end surface of the outward protruding portion of the ferrule is formed on the outer peripheral end surface of the coupling member. You may make it form the external thread screwed together by the internal thread formed in the internal peripheral end surface of an inward protrusion. If it does in this way, it replaces with pressing force and can insert the protrusion part of a ferrule in the said enlarged diameter part by screwing, and can be temporarily fixed.

  In addition, the ferrule may be formed with a weakly strong portion for facilitating press-fitting of the outward protrusion into the inward protrusion. In this way, when the outward projecting portion is press-fitted into the inward projecting portion, the temporary fixing operation of the ferrule can be facilitated by deformation of the weakly strong portion.

  Further, the ferrule may be formed so that the cross-sectional shape in the vicinity of the press-fitting portion is different before and during press-fitting by forming the weak portion. In the case of such a configuration, a structure for reducing the diameter of the press-fit portion can be easily formed.

  Further, the weak portion is formed by forming the outward projecting portion or a recessed portion recessed in the radial direction from the front end side to the rear end at a plurality of locations in the circumferential direction. However, a thin thin portion may be formed intermittently at the rear end. In this way, the circumferential dimension of the thin wall portion having a small radial thickness is elastically shrunk and expanded when the outward projection is press-fitted into the inward projection. After being inserted into the diameter portion, it will elastically return to its original dimensions. This facilitates the press-fitting operation of the outward protrusion into the inward protrusion.

  Further, in the weak portion, a radial through hole is formed at a plurality of locations in the circumferential direction before and after the outward projecting portion in the axial direction, and a thin wall portion having a thin axial thickness is formed by the through hole. It is good also as a structure formed in the rear-end part intermittently. In this way, the circumferential dimension of the thin wall portion having a thin axial thickness is elastically shrunk when the outward protrusion is press-fitted into the inward protrusion, and the diameter is increased. After being inserted into the part, it will elastically return to its original dimensions. This facilitates the press-fitting operation of the outward protrusion into the inward protrusion.

  Further, the weak portion is formed with an annular cut from the outer peripheral side and the inner peripheral side, or from either the outer peripheral side or the inner peripheral side at the distal end side of the outward projection in the ferrule, It is good also as a structure by which the cyclic | annular thin part with a thin radial thickness was formed in the front end side of the said outward protrusion by the cyclic | annular cutting. If it does in this way, when the outward protrusion in the said ferrule is press-fit in the said inward protrusion, it will become easy to bend in an axial direction. This facilitates the press-fitting operation of the outward protrusion into the inward protrusion.

  Further, the coupling member has cut portions for facilitating press-fitting of the outward protrusion into the inward protrusion at several locations in the circumferential direction of the inward protrusion. In this way, the ferrule is formed with a weakly strong portion for easily press-fitting the outward protrusion into the inward protrusion. Also good. In this way, when the outward protrusion is press-fitted into the inward protrusion, the inward protrusion is easily deformed, so that the temporary fixing operation of the ferrule is facilitated.

  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, since such valves and pipe joints can perform pipe connection work in the same way as a ferrule integrated into one piece, there is a risk that the ferrule may be lost during pipe connection work as in the case of a separate and independent type ferrule. In addition, since there is no work for assembling the ferrule which is a small part, workability at the time of pipe connection is improved.

  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, there is no risk of losing the ferrule when connecting a pipe to such a valve or pipe joint, and workability is improved. improves.

  According to the bite type pipe connection structure according to the present invention, since the rear end portion temporary fixing of the ferrule is performed at the joint body side end portion of the pipe connecting portion, the processing of the temporary fixing portion is facilitated and the ferrule temporary fixing is performed. Stopping work becomes easy. Further, since the axial distance between the threaded portion of the male screw portion and the female screw portion and the pressing surface of the ferrule by the coupling member is close, it is possible to avoid one-side contact when the ferrule is pressed. Moreover, since the temporary fixing mechanism is formed by recessing the joint body side end face of the pipe connecting portion, the dimension in the axial direction does not increase.

Hereinafter, a bite type pipe connection structure according to an embodiment 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 adopting such a pipe connection structure in a pipe joint part, and is a state diagram at the start of fastening, and FIG. 2 shows a ferrule in the bite type pipe joint. It is the assembly | attachment state figure temporarily fixed to the coupling member.

  As shown in FIGS. 1 and 2, 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 a joint main body 1 screwed together. 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. 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 and 2 and FIG. 3 which is a single drawing of the joint body, a socket part 12 is formed on the front side of the base part 11, and the base part 11 is formed. A female threaded cylinder part 13 is formed on the rear side of the outer peripheral part, and a shaft part 14 projecting into a space in the female threaded cylinder part 13 is formed on the rear side of the axial center part of the base part 11. On the inner surface of the female screw cylinder portion 13, a female screw portion 13 a as a screwing portion of the coupling member 2 is formed. 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. Further, a vent hole 15a for preventing internal freezing is formed at the base end portion of the annular space portion 15 (see FIGS. 3A and 3B).

  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, in the cam surface 19, the expansion angle θ2 of the vicinity 19a connected to the front side pipe insertion port 16 is larger than the expansion angle θ1 of the conical portion on the inlet side, that is, the rear side (coupling member 2 side). (See FIG. 3C).

  The coupling member 2 is made of brass, and as shown in FIGS. 1 and 2 and FIG. 4 which is a single drawing of the coupling member, a pipe through hole 21 through which the pipe P passes through the shaft center is formed. A disc-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. 6).

  On the outer periphery of the pipe connecting portion 23, a male screw portion 23a is formed as a screwing portion to be screwed with the joint main body 1. Further, the outer shape of the gripping portion 24 is formed in a hexagonal nut shape so that it can be gripped with a 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 constituting the gist of the present invention is formed at the joint main body end portion 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, 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 this protrusion 29 is formed in the inclined surface where a diameter becomes large ahead (refer FIG.2 and FIG.4 (c)). This inclined surface 29a is for facilitating press-fitting of an annular protrusion 35 formed at the rear end portion of the ferrule 3 described later. An annular enlarged diameter portion 29 b is formed between the inward projection 29 and the pressing surface 28.

  In addition, four engagement hole portions 51 having a circular cross section and a predetermined depth are formed on the surface of the pipe connection portion 23 on the side opposite to the joint body as engagement portions that engage with a special tool described later. Yes. The gripping portion 24 is formed with a processing hole 52 that allows 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 and 2 and FIG. 5 which is a single drawing of the ferrule. . 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 forming the front outer peripheral surface 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. As a result, the front portion 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 ( (See FIG. 2). 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 of the coupling member 2 and can be transported while being temporarily fixed to the coupling member 2 and being 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 FIG. 2, the ferrule 3 has a thin wall 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. 38 is like a hinge so that the front and rear portions are easily bent toward the axial center. 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 as a component with its rear end part temporarily fixed to the coupling member 2 in the transport and management stage. 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 inward protruding portion 29 of the coupling member 2 come into contact, and then the rear end portion of the ferrule 3 is press-fitted and deformed. Is done. 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, since the inward projection 29 and the outward projection 35 are slightly caught, they can be removed.

Next, a pipe connection method using the present coupling member configured as described above will be described.
When the pipe P is connected by the joint body 1 and the coupling member 2, the joint body 1 is first attached to a predetermined place. The joint body 1 can be attached to pipe connection ports of various devices such as pipes and shut-off valves. It is. On the other hand, the pipe P to be connected is inserted into the pipe through hole 21 of the coupling member 2 and the insertion hole 31 of the ferrule 3 in a state where the ferrule 3 is temporarily fixed, and the coupling member 2 is externally attached to 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 is jointed. 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. 6).

  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. 6, the end portion of the female screw cylinder portion 13 of the joint body 1 and the joint body of the disk-shaped 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.

  Next, since the pipe connection part fastened in the above state cannot be easily loosened by anyone because the grip part 24 is cut, a dedicated tool as shown in FIG. 7 is used. By this, this pipe connection part can be loosened.

  As shown in FIG. 7, the dedicated tool 60 has a handle 62 attached to a semicircular 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 is engaged with any three adjacent engagement hole portions 51 of the pipe connection portion 23, and a force is applied to the handle 62 of the dedicated tool 60 to thereby form the base portion 61. , The pipe connecting 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 removed 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 using the new ferrule 3 by pulling out the ferrule temporarily fixed to the coupling member 2. be able to.

Next, according to the bite type pipe connection structure according to the present embodiment configured as described above, the following effects can be obtained.
(1) Since the temporary fixing portion for temporarily fixing the rear end portion of the ferrule 3 to the coupling member 2 is formed on the joint main body 1 side end portion of the pipe connecting portion 23, the processing of the temporary fixing portion is facilitated. The temporary fixing work of the ferrule 3 is also facilitated.

  (2) Since the axial distance between the threaded portion of the male screw portion 23a and the female screw portion 13a and the pressing surface 28 of the ferrule 3 in the coupling member 2 is close, the ferrule 3 is piped when the ferrule 3 is pressed. It is avoided to press against P in a single-contact state.

  (3) Further, a radially outward projecting portion 35 is formed at the rear end portion of the ferrule 3, and the outer diameter of the outward projecting portion 35 is formed at the entrance of the recessed portion 27 of the pipe connecting portion 23. It is formed to be slightly larger than the inner diameter of the protruding projection 29. In addition, the axial length of the projection 35 is formed to be smaller than the axial length of the enlarged diameter portion 29b, and the outward projection 35 is temporarily fixed so as to be positioned in the enlarged diameter portion 29b. Accordingly, the ferrule 3 is temporarily fixed to the coupling member 2 at the joint main body side end of the pipe connection portion 23 so as to be rotatable and movable in the axial direction within a predetermined range. It can be conveyed while being integrated, and can be assembled to the joint body 1.

  (4) Further, in order to assemble in such a temporarily fixed state, the outward projection 35 of the ferrule 3 is in contrast to the inward projection 29 formed at the inlet portion of the recess 27 of the pipe connection portion 23. In addition, it is configured to be inserted into the enlarged diameter portion 29b by the press-fitting deformation action. Therefore, the ferrule 3 and the coupling member 2 can be temporarily fixed by pressing the rear end portion of the ferrule 3 into the recess 27 in a state where the ferrule 3 and the coupling member 2 are aligned.

  (5) Temporary fixing of the ferrule 3 according to the present embodiment to the coupling member 2 can be removed from the coupling member 2 in the case of reconnection of the piping P, so that the ferrule 3 is replaced with a new one. If exchanged, the joint body 1 and the coupling member 2 can be reused. In the case of the conventional integrated type, since the ferrule and the coupling member are formed as a single body, in such a case, it was necessary to replace the ferrule and the coupling member with a new one, but to eliminate such waste. Can do.

  (6) Since valves and pipe joints using the pipe connection structure according to the present embodiment can perform pipe connection work in the same manner as the one in which the ferrule 3 is integrally processed, a conventional separate and independent type ferrule is used. There is no risk of losing the ferrule during pipe connection work as it is used. In addition, work for assembling the ferrule, which is a small part, is eliminated, so that workability at the time of pipe connection is improved.

  (7) Also in a refrigeration apparatus using such a valve or pipe joint in a refrigerant circuit, the ferrule may be lost during pipe connection work, as in the case of using a conventional separate and independent type ferrule at the time of pipe connection. There is no. In addition, work for assembling the ferrule, which is a small part, is eliminated, so that workability at the time of pipe connection is improved.

(Embodiment 2)
Next, the second embodiment will be described with reference to FIG.
The second embodiment is obtained by changing the configuration of the temporary fixing mechanism of the ferrule 3 in the first embodiment. FIG. 8 shows the configuration of the temporary fixing mechanism in the second embodiment, where (a) is a side view of the ferrule and (b) is a cross-sectional view of the coupling member. In the drawing, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the temporary fixing mechanism according to the second embodiment, the end face of the inward projection 29 provided at the inlet of the recess 27 formed on the side surface of the joint main body of the pipe connecting portion 23 is formed substantially parallel to the central axis. In addition, a female screw 71 is formed on the inner peripheral end face. Further, the outer peripheral end surface of the radially outward projecting portion 35 formed at the rear end portion of the ferrule 3 is formed substantially parallel to the central axis, and the male screw 72 is engaged with the above-described female screw 71 on the outer peripheral end surface. Is formed.

  With this configuration, when the rear end of the ferrule 3 is temporarily fixed to the coupling member 2, the protrusion 35 at the rear end of the ferrule 3 is screwed onto the inward protrusion 29 of the pipe connection portion 23. Combined. Then, the ferrule 3 is screwed in until the screwing relationship is released, so that the protrusion 35 is inserted into the enlarged diameter portion 29b as in the case of the first embodiment, and is temporarily fixed as in the case of the first embodiment. Function can be demonstrated.

(Embodiment 3)
Next, Embodiment 3 will be described with reference to FIG.
The third embodiment is obtained by changing the configuration of the temporary fixing mechanism of the ferrule 3 in the first embodiment. FIG. 9 shows the configuration of the temporary fixing mechanism according to the third embodiment, and FIG. 9A is an enlarged view showing the configuration of the temporary fixing mechanism at the rear end of the ferrule 3, and is in the process of forming the temporary fixing mechanism. FIG. 6B is a state diagram after completion of the temporary fixing mechanism. In the drawing, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The temporary fixing mechanism according to the third embodiment has no change in the configuration formed on the joint body side surface of the pipe connection portion 23 described above, and the radial outward projection 35 formed on the rear bridge portion of the ferrule 3. The configuration has changed. As shown in FIG. 9A, the protrusion 35 in this embodiment is formed so that the outer diameter of the protrusion 35 is smaller than the inner diameter of the radially inward protrusion 29 in a finished state as a part of the ferrule 3. Has been. Then, the rear end portion of the ferrule 3 is inserted into the concave portion 27 of the pipe connecting portion 23, and the protrusion 35 is pressed against the pressing surface 28, so that the protrusion 35 is directed outward as shown in FIG. 9B. It is transformed to get up. The outer diameter of the protrusion 35 is modified so as to be larger than the inner diameter of the protrusion 29 that is radially inward of the pipe connecting portion 23. Therefore, after being deformed in this way, a temporary fixing function similar to that of the first embodiment can be exhibited.

(Embodiment 4)
Next, a fourth embodiment will be described with reference to FIGS.
In the fourth embodiment, weak portions that cross the outward projection 35 in the axial direction are formed at four locations around the projection 35 in the first embodiment, and the outward projection 35 is formed. This facilitates press-fitting into the inward projection 29. FIG. 10 is a single drawing of the ferrule according to the present embodiment, in which (a) is a rear view of the ferrule, and (b) is a DD cross-sectional view in (a). FIG. 11 is a rear view of the ferrule when the ferrule is press-fitted into the inward protrusion of the coupling member. FIG. 12 is a perspective view of the ferrule. In these drawings, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 10 and FIG. 12, the ferrule 3 in this embodiment is such that when a force is applied from the outer peripheral surface toward the shaft core, the circular rear surface is distorted into a non-circular shape and the outer shape is reduced. The weak part is formed in four places of the circumferential direction. In order to form a weak portion, the radial direction across the protrusion 35 from the front end side (front side) to the rear end face of the outward protrusion 35 at four locations on the outer peripheral surface near the protrusion 35 of the ferrule 3 An axial groove-shaped recess 81 having a rectangular cross section is formed, and a thin-walled portion 82 having a small radial thickness is formed between the bottom of the recess 81 and the insertion hole 31. Therefore, the thin-walled portion 82 is a portion that is weak in strength that crosses the protrusion 35 in the axial direction, and is strong for facilitating the press-fitting of the outward protrusion 35 into the inward protrusion 29. It is a weak part.

  Since the fourth embodiment is configured as described above, it operates as follows. When the outward projecting portion 35 is press-fitted into the inward projecting portion 29, a force acts on the outward projecting portion 35 from the outer peripheral side toward the shaft core, and as shown in FIG. The thin portion 82 bends so that the groove width becomes small. As a result, the circular outer peripheral shape 351 (two-dot chain line in FIG. 11) before press-fitting becomes a non-circular outer peripheral shape 352 different from the shape before press-fitting at the time of press-fitting, and the outer shape becomes smaller, and the outward protrusion The press-fitting of the 35 into the inward projection 29 is easily performed. In the state where the outward projection 35 is press-fitted and inserted into the enlarged diameter portion 29b, the force does not act on the outward projection 35 from the outer peripheral side. The shape is elastically restored to the shape, and the outward projecting portion 35 is stably held in the enlarged diameter portion 29b.

(Embodiment 5)
Next, a fifth embodiment will be described with reference to FIGS.
In the fifth embodiment, as in the case of the fourth embodiment, weak portions that cross the outward projecting portion 35 in the axial direction are provided at four locations around the projecting portion 35 in the first embodiment. It is formed to facilitate the press-fitting of the outward projection 35 into the inward projection 29. FIG. 13 is a single drawing of the ferrule according to the present embodiment, in which (a) is a rear view of the ferrule, and (b) is a cross-sectional view taken along line EE in (a). FIG. 14 is a rear view of the ferrule when the ferrule is press-fitted into the inward protrusion of the coupling member. FIG. 15 is a perspective view of the ferrule. In these drawings, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 13 and 15, the ferrule 3 in this embodiment is configured such that when a force is applied from the outer peripheral surface toward the axis, the circular rear surface is distorted into a non-circular shape and the outer shape is reduced. The weak part is formed in four places of the circumferential direction. In order to form weak portions in strength, through holes 85 having a rectangular cross section are formed from the front end side (front side) to the rear end surface side (rear side) of the outward projection 35 at four locations on the outer peripheral surface of the ferrule 3. A thin portion 86 having a small axial thickness is formed between the rear end surface of the through hole 85 and the rear end surface of the ferrule 3. Therefore, the thin-walled portion 86 is a portion that is weak in strength that crosses the protrusion 35 in the axial direction, and is strong for facilitating the press-fitting of the outward protrusion 35 into the inward protrusion 29. It is a weak part.

  For this reason, when the outward projection 35 is press-fitted into the inward projection 29, a force acts on the outward projection 35 from the outer peripheral side toward the shaft core. Thereby, as shown in FIG. 14, the thin-walled portion 86 is bent so that the hole width in the circumferential direction of the through hole 85 is reduced, and the circular outer peripheral shape 355 (two-dot chain line in FIG. 14) before press-fitting is non-circular The outer shape of the outer protrusion 356 becomes smaller, and the outward protrusion 35 is easily press-fitted into the inward protrusion 29. In addition, in the state where the outward projecting portion 35 is press-fitted and inserted into the enlarged diameter portion 29b, no force acts on the outward projecting portion 35 from the outer peripheral side. The shape is elastically restored to the shape, and the outward projecting portion 35 is stably held in the enlarged diameter portion 29b.

(Embodiment 6)
Next, Embodiment 6 will be described with reference to FIG.
In the sixth embodiment, in the first embodiment, the outward protrusion 35 is easily bent toward the axial center, thereby facilitating the press-fitting of the outward protrusion 35 with respect to the inward protrusion 29. is there. FIG. 16 is an enlarged view of the temporary fixing portion of the ferrule according to the present embodiment. In the drawing, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 16, the ferrule 3 in this embodiment has a protruding portion so that the outward protruding portion 35 is easily bent toward the axial center when a force is applied from the outer peripheral surface toward the shaft core. An annular strength weak portion is formed at the front portion of 35. In order to form an annular weak portion, a wedge-shaped cut 91 is formed in an annular shape on the outer peripheral surface of the thin portion 38 of the ferrule 3. Thereby, an annular thin portion 92 is formed between the second notch 37 and the notch 91. Therefore, the annular thin portion 92 constitutes a weak portion for facilitating the press-fitting of the outward projection 35 into the inward projection 29.

  Since the sixth embodiment is configured as described above, it operates as follows. When the outward projection 35 is press-fitted into the inward projection 29, a force acts on the outward projection 35 from the outer peripheral side toward the axis. As a result, as shown by a two-dot chain line in FIG. 16, the outward projection 35 is bent toward the axial center with the annular thin portion 92 as the bending center, and the inside of the inward projection 29 of the outward projection 35. It is easy to press fit into. In addition, in the state where the outward projection 35 is press-fitted and inserted into the enlarged diameter portion 29b, no force acts on the outward projection 35 from the outer peripheral side. It is elastically restored to a substantially original shape, and the outward projecting portion 35 is stably held in the enlarged diameter portion 29b.

(Embodiment 7)
Next, Embodiment 7 will be described with reference to FIGS.
The seventh embodiment facilitates the press-fitting of the outward projection 35 with respect to the inward projection 29 by making the inward projection 29 easier to bend backward in the first embodiment. Note that FIG. 17 is an enlarged view of the temporary fixing portion of the ferrule according to the present embodiment. FIG. 18 is a perspective view seen from the front side of the coupling member. In the drawing, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the coupling member 2 in this embodiment, as shown in FIG. 18, notches 95 are formed at six locations in the circumferential direction of the inward projection 29. The depth (diameter dimension) of the notch 95 is substantially set to a depth from the inward protruding portion 29 to the enlarged diameter portion 29b. As a result, the inward protruding portion 29 has a shape formed by a plurality of arc-shaped protrusions 96. Therefore, when the outward protruding portion 35 is press-fitted into the inward protruding portion 29, a plurality of inward protruding portions 29 are formed. The arc-shaped protrusion 96 can be easily deformed so as to be bent backward. As a result, the outward projection 35 can be easily press-fitted into the inward projection 29. In the state where the outward projection 35 is press-fitted and inserted into the enlarged diameter portion 29b, no force acts on the inward projection 29, so that the plurality of arc-shaped projections 96 have a substantially original shape. Thus, the outward projecting portion 35 is stably held in the enlarged diameter portion 29b.

(Modification)
The above embodiment can be modified as follows.
In the present embodiment, the temporary fixing mechanism for the ferrule 3 and the coupling member 2 is temporarily fixed to the coupling member 2 so as to be rotatable with respect to the coupling member 2 and movable in the axial direction within a predetermined range. Any structure may be used as long as the structure can be transported while being temporarily fixed and integrated and can be assembled to the joint body 1.

-In Embodiment 4 and 5, the weak part is formed in four places of the circumferential direction, However, You may give this to many places.
In addition, in Embodiment 7, the notch 95 is formed in six places, but this number should be changed appropriately according to the balance between the force required for press-fitting and whether it is stably held after insertion. Can do. Similarly, the width of the notch 95 can be changed as appropriate. Furthermore, instead of the cutout portion 95, an appropriate number of simple cuts may be used.

  In Embodiment 6, the annular thin portion 92 is formed between the second notch 37 and the outer peripheral cut 91, but the shape and thickness of the thin portion 38 on the outer peripheral side of the second notch 37 Depending on the thickness, the outer peripheral cut 91 may be omitted. As described above, the annular thin portion 92 can be formed only by cutting on the inner peripheral side. On the contrary, it can be formed only by cutting on the outer peripheral side.

  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 in each embodiment 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 sectional drawing of the bite type pipe connection structure which concerns on Embodiment 1 of this invention, Comprising: It is a state figure of pipe connection start. In the bite type pipe connection structure, the rear end portion of the ferrule is temporarily fixed to a coupling member and integrated. It is a unit drawing of the joint main body in the same bite type pipe connection structure, (a) is a side view, (b) is an AA sectional view in (a), (c) is an enlarged view of a cam surface part. It is. 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 BB sectional view in (a), (c) is a joint body side side. It is a block diagram of the formed temporary fix | stop mechanism. It is the single drawing of the ferrule in the same bite type pipe connection structure, (a) is a side view, (b) is CC sectional drawing 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 the figure which showed the temporary fix | stop mechanism in the bite type pipe connection structure concerning Embodiment 2 of this invention, Comprising: (a) is a side view of a ferrule, (b) is sectional drawing of a coupling member. It is the figure which showed the structure of the temporary fix mechanism in the bite type pipe connection structure concerning Embodiment 3 of this invention, Comprising: (a) is an enlarged view which shows the structure of the rear-end part temporary fix mechanism of the ferrule 3. FIG. 4 is a state diagram in the middle of forming the temporary fixing mechanism, and FIG. 4B is a state diagram after completion of the temporary fixing mechanism. It is a single figure of the ferrule which concerns on Embodiment 4 of this invention, Comprising: (a) is a rear view of a ferrule, (b) is DD sectional drawing in (a). FIG. 6 is a rear view of the ferrule when the ferrule is press-fitted into the back of the inward protrusion of the coupling member. It is a perspective view of the same ferrule. It is the single figure of the ferrule which concerns on Embodiment 5 of this invention, Comprising: (a) is a rear view of a ferrule, (b) is EE sectional drawing in (a). FIG. 6 is a rear view of the ferrule when the ferrule is press-fitted into the back of the inward protrusion of the coupling member. It is a perspective view of the same ferrule. It is an enlarged view of the temporary fix | stop part of the ferrule which concerns on Embodiment 6 of this invention. It is an enlarged view of the temporary fix | stop part of the ferrule which concerns on Embodiment 7 of this invention. It is the perspective view seen from the front side of the coupling member concerning the embodiment. It is sectional drawing of the conventional bite type pipe connection structure, Comprising: It is a state figure of the fastening start.

Explanation of symbols

  P ... pipe, 1 ... joint body, 2 ... coupling member, 3 ... ferrule, 11 ... base, 13 ... female screw cylinder, 13a ... female screw, 16 ... pipe insertion port, 19 ... cam surface, 23 ... pipe connection , 23a ... male screw portion, 27 ... concave portion, 28 ... pressing surface, 29 ... (inward) protrusion, 29b ... diameter-expanded portion, 33 ... tapered surface, 35 ... (outward) protrusion, 71 ... female screw, 72 ... male screw, 81 ... recessed portion, 82.86.92 ... thin wall portion, 85 ... through hole, 91 ... notch, 95 ... notch.

Claims (15)

A joint body, a coupling member screwed into the joint body and assembled, and a ferrule formed separately from the joint body and the coupling member and sandwiched between the joint body and the coupling member In the bite type pipe connection structure,
The joint body includes an internal thread cylinder portion in which an internal thread portion for screwing a coupling member is formed on an inner peripheral surface, a base portion forming a side wall of the internal thread cylinder portion, and a pipe to be connected formed in an axial center portion of the base portion. A pipe insertion port for insertion, and a cam surface formed at the inlet of the pipe insertion port;
The coupling member includes a pipe connection portion formed on the outer periphery of a male screw portion that is screwed into the female screw portion, and a pressing surface that presses a rear end portion of a ferrule formed on a joint body side end portion of the pipe connection portion. And
The ferrule is formed with a tapered surface whose front end is in close contact with the cam surface, and its rear end is rotatable with respect to the coupling member at a joint body side end of the pipe connecting portion and within a predetermined range. The bite type pipe connection structure is configured to be temporarily fixed so as to be movable in the axial direction and to be able to be assembled to the joint body while being temporarily fixed to the coupling member and integrated. The coupling member has a concave portion with a side surface recessed in the axial direction at an end of the pipe connecting portion on the joint body side, and the concave portion has the pressing surface formed at the back and the inlet portion. A radially inward projection is formed, and further, an enlarged diameter portion is formed between the inward projection and the pressing surface,
The ferrule is formed with a radially outward projection at the rear end, and the outer diameter of the outward projection is larger than the inner diameter of the inward projection of the pipe connecting portion. The axial length is smaller than the axial length of the enlarged diameter portion, and the outward projection is inserted and held in the enlarged diameter portion via the radially inward projection. The bite type pipe connection structure according to claim 1, wherein the bite type pipe connection structure is configured.   The outward protrusion of the ferrule is formed so that its outer diameter is larger than the inner diameter of the inward protrusion of the recess before being inserted into the enlarged diameter portion. The bite type pipe connecting structure according to claim 2, wherein the biting type pipe connecting structure is press-fitted into the diameter-expanded portion and is inserted into the enlarged diameter portion.   The outward protrusion of the ferrule is formed so that its outer diameter is smaller than the inner diameter of the inward protrusion of the recess before being inserted into the enlarged diameter portion, and is inserted into the enlarged diameter portion. 3. The bite type pipe connection structure according to claim 2, wherein the biting type pipe connection structure is formed so as to be deformed by being pressed against the pressing surface and then being larger than the inner diameter of the inward projection of the recess.   An internal thread is formed on the inner peripheral end surface of the inward protruding portion of the recess, and the outer peripheral end surface of the outward protruding portion of the ferrule is formed on the inner peripheral end surface of the inward protruding portion of the coupling member. 3. The bite type pipe connection structure according to claim 2, wherein a male screw screwed with the female screw is formed.   4. The bite type pipe connection according to claim 3, wherein the ferrule is formed with a weakly strong portion for facilitating press-fitting of the outward protrusion into the inward protrusion. Construction.   The bite type pipe connection structure according to claim 6, wherein the ferrule has a weak portion so that a cross-sectional shape in the vicinity of the press-fitting portion is different between before press-fitting and during press-fitting.   The weak portion is formed with the outward projecting portion or a recessed portion that is recessed in the radial direction from the front end side to the rear end at a plurality of locations in the circumferential direction, and the thickness in the radial direction is thin due to the recessed portion. The bite type pipe connection structure according to claim 6 or 7, wherein the thin wall portion is formed intermittently at the rear end portion.   In the weak portion, a radial through hole is formed at a plurality of locations in the circumferential direction before and after the outward projecting portion in the axial direction, and a thin portion with a small axial thickness is formed at the rear end by the through hole. The bite type pipe connection structure according to claim 6 or 7, wherein the structure is formed intermittently in the portion.   The weak portion is formed with an annular cut from the outer peripheral side and the inner peripheral side or from either the outer peripheral side or the inner peripheral side at the tip side of the outward projecting portion of the ferrule. 7. The bite type pipe connection structure according to claim 6, wherein an annular thin portion having a thin radial thickness is formed on the tip side of the outward projecting portion by cutting.   In the coupling member, cuts or notches for facilitating press-fitting of the outward protrusions into the inward protrusions are formed at several locations in the circumferential direction of the inward protrusions. The bite type pipe connection structure according to claim 3, wherein the bite type pipe connection structure is provided.   The valve which used the pipe connection structure of any one of Claims 1-11 for a pipe joint part.   The bite type pipe joint which used the pipe connection structure of any one of Claims 1-11 for the pipe joint part.   A refrigeration apparatus using the valve according to claim 12 in a refrigerant circuit.   A refrigeration apparatus using the bite type pipe joint according to claim 13 in a refrigerant circuit.

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