JP2009097699A - Pipe connection structure, valve, pipe coupling and refrigerating unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe connection part, a valve, a pipe coupling and a refrigerating unit using the same, for preventing anybody from easily loosening a threadedly engaging part or removing a pipe by loosening the threadedly engaging part, after connecting the pipe. <P>SOLUTION: This pipe connection structure is provided for fastening a joining member 2 to a coupling body 1. The joining member 2 is divided into two parts of the pipe connection part 23 threadedly engaged with the coupling body 1 by a disk-like slit 22 having a cut line in the radial direction and a gripping part 24 graspable by a general fastening tool, and both are connected by a tubular connection part 27. The gripping part 24 is separated from the pipe connection part 23 by dividing the tubular connection part 27 in a process of connecting the pipe, and is also covered with a cover 52 in a state of being out-fitted to the pipe P after being separated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe connection structure, and in particular, to a pipe connection structure including a joint body attached to a connected device side to which a pipe is connected and a coupling member that is externally attached to the pipe to be connected and fastened to the joint body. . The present invention also relates to a valve, a pipe joint, and a refrigeration apparatus that employ such a pipe connection structure in a pipe joint portion.

In a refrigerant pipe of a refrigeration apparatus, a flare as described in Patent Document 1 is generally used as a pipe connection structure including a joint body and a coupling member that is externally attached to the joint body and is fastened to the joint body. A joint or a bite-type joint described in Patent Document 1 or Patent Document 2 is used. Further, these pipe joints are tightened with a fastening tool until the rotational torque reaches a predetermined value, and the fastening operation is completed. And after piping work completion, it is used with the state at the time of work completion. Therefore, if a general fastening tool such as a wrench or wrench is used for the pipe joint once connected, anyone can easily loosen the screwed part of the pipe joint or remove the pipe by loosening the screwed part. I was able to. Patent Document 3 shows an example of a piping cover related to the embodiment of the present invention.
JP 2003-74769 A JP-T-2004-526911 JP-A-8-93989

  However, chlorofluorocarbon gas, which is frequently used as a refrigerant in refrigeration equipment in recent years, causes harmful effects such as ozone layer destruction and global warming when released into the atmosphere, and its handling has become stricter year by year. . Recently, it has become necessary to have a structure in which parts connected by pipe joints cannot be easily removed.

  The present invention has been made on the basis of such a background, and it is not possible for anyone to easily loosen the screwed part after connecting the pipe or to remove the pipe by loosening the screwed part. An object is to provide a connection structure. Another object of the present invention is to provide a valve, a pipe joint, and a refrigeration apparatus using such a pipe connection structure.

  The pipe connection structure according to the present invention solves the above-described problem, and is fitted to a joint main body attached to a connected side device for connecting a pipe and a pipe connected to the joint main body and fastened to the joint main body. A coupling member, the joint body has a threaded portion for threading the coupling member, and the coupling member has a threaded portion for threading the joint body, and a through-hole that passes through the pipe vertically passing through the shaft center portion. And a disc-shaped slit having a radial cut so as to bisect the coupling member, and a pipe provided with a component member of the pipe connection mechanism, being positioned on the joint body side of the disc-shaped slit and screwed into the joint body A thin portion formed between the connection portion and the disc-shaped slit on the side opposite to the joint body and formed so as to be gripped by a general fastening tool, and the disc-shaped slit and the through hole. The tube connection part and the grip part are connected by the tubular part. And the gripping part is separated from the pipe connection part by dividing the tubular connection part in the process of pipe connection, and is covered with the pipe after being separated. It is covered with.

  Here, the coupling member may be integrally manufactured in a state where the gripping portion and the tube connection portion are connected by the tubular connection portion, or the gripping portion and the tube connection portion are bonded and meshed by the tubular connection portion. The thing joined by engagement means, such as, may be sufficient. Further, the division means a case where the connecting portion is cut, broken or separated.

  According to the pipe connection structure according to the present invention having such a structural feature, the tubular connecting portion can adjust the force necessary for the division by adjusting the area of the connecting portion. Moreover, this tubular connection part is parted in the process of pipe connection. For this reason, after the pipe connection is completed, the gripping portion formed so as to be gripped by a general fastening tool is divided, and the pipe connection portion cannot be loosened using a general tool. Furthermore, according to the pipe connection structure of the present invention, the tubular connecting part is separated from the pipe connection part in the process of pipe connection, and the separated gripping part is covered with the cover in a state where the separated gripping part is sheathed on the pipe. Therefore, the gripping part is not exposed on the pipe. As a result, since it looks like a pipe connection structure that does not have a gripping portion, there is a sense of security that does not cause the joint portion to be easily loosened. This avoids inadvertent refrigerant gas leakage and release to the atmosphere. In addition, when the gripping part is left on the pipe after connecting the pipe, it is possible that the gripping part will make noise due to vibration of the pipe, but this noise can be suppressed by covering the gripping part with a cover. it can. Further, the appearance is improved as compared with the case where the gripping part is left naked.

  In addition, the gripping portion may be covered with an end portion of the expanded piping heat insulating material in a state of being separated from the pipe connecting portion screwed into the joint body. preferable. In this way, the grip portion can be covered without using a dedicated cover.

  Further, the gripping portion is in contact with the pipe connection portion, and the end portion of the expanded heat insulating material for piping is used as a cover, and is covered with the joint member side end portion of the joint body by this cover. You can also In this way, when the engaging portion for engaging the dedicated tool is formed at the end of the pipe connecting portion, the engaging portion together with the grip portion can be concealed. It is possible to make it difficult to loosen the pipe connection part easily.

  Further, the grip portion may be covered with a dedicated cover formed separately from other members in a state separated from the pipe connection portion screwed into the joint body. If it does in this way, it can cover regardless of whether a heat insulating material is given to piping. Moreover, even if a heat insulating material is applied to the pipe, it can be covered separately from the construction work of the heat insulating material for the pipe.

  In addition, the grip portion may be covered with the coupling member side end portion of the joint main body by a dedicated cover formed separately from the other members in a state where the grip portion is in contact with the pipe connection portion. If it does in this way, it can cover regardless of whether a heat insulating material is given to piping. Moreover, even if a heat insulating material is applied to the pipe, it can be covered separately from the construction work of the heat insulating material for the pipe. In addition, even if an engaging part for engaging the dedicated tool is formed at the end of the pipe connecting part, the engaging part together with the gripping part can be covered, so that the pipe connecting part can be more easily and easily Can not be loosened.

  Moreover, it is preferable that the said exclusive cover is formed with the resin molded product substantially along the external shape of the part covered with a cover. If it does in this way, since a grasping part can be covered only by fitting a cover in an appropriate position, workability improves.

  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. The refrigeration apparatus according to the present invention is characterized in that these valves or bite type pipe joints are used in a refrigerant circuit. Therefore, such a valve, a bite-in type pipe joint, and a refrigeration apparatus using the same cannot easily loosen the pipe joint part after connecting the one-end pipe. In addition, since the separated grip portion is covered without being left on the pipe, noise due to vibration is suppressed and appearance is improved.

  According to the pipe connection structure according to the present invention, after the pipe connection is completed, the grip portion formed so as to be gripped by a general fastening tool is divided. The connection cannot be loosened. Moreover, since the divided | segmented separated holding | grip part will be in the state which is covered with a cover and is not exposed, there exists a sense of security which does not raise the mind which loosens a joint part easily with respect to the person who sees this. In addition, since the grip portion is covered without being left on the pipe, noise due to vibration of the pipe is suppressed and the appearance is improved.

(Embodiment 1)
A pipe connection structure according to Embodiment 1 will be described with reference to the drawings. The pipe connection structure according to the present embodiment is applied to a bite type pipe joint in a refrigerant circuit in the field of a refrigeration apparatus such as an air conditioner, and an indoor / outdoor communication pipe is provided to an outdoor unit of a separation type air conditioner. It is applied to the pipe joint part etc. in the closing valve to be connected. FIG. 1 is a partial cross-sectional view showing a state in which fastening of a bite type pipe joint in which such a pipe connection structure is adopted for a pipe joint part of a bite type pipe joint is started.

  As shown in FIG. 1, the bite type pipe joint is externally attached to a joint body 1 attached to a pipe Pa led out from a connected side device and a pipe P to be connected to the bite type pipe joint. 1, and a ferrule 3 formed integrally with the coupling member 2. In the following description, when referring to the front-rear direction in this specification, the joint body 1 side (for example, the left side in FIG. 1) is the front side, and the coupling member 2 side (for example, the right side in FIG. 1) is the rear side. And This also applies to each embodiment described later.

  As shown in FIGS. 1 and 2, the joint body 1 has a socket portion 12 formed on the front side of the base portion 11, a female screw cylinder portion 13 formed on the rear side of the outer peripheral portion of the base portion 11, and a base portion 11. A shaft portion 14 is formed on the rear side of the shaft center portion so as to project into the space in the female screw cylinder portion 13. A female screw 13 a as a threaded portion of the coupling member 2 is formed in the female screw cylinder portion 13. On the outer peripheral side of the shaft portion 14, an annular space portion 15 is formed that accommodates a protective cylinder portion 26 of the coupling member 2 described later when the pipe is connected. The outer shape of the base 11 and the internal thread cylinder 13 is integrally formed in a hexagonal nut shape. An insertion port 16 into which the pipe P is inserted is formed in the shaft center portion from the base portion 11 to the shaft portion 14, and an insertion port 17 into which the piping Pa is inserted is formed in the shaft center portion from the base portion 11 to the socket portion 12, Further, between the insertion port 16 and the insertion port 17, a step portion 18 that forms a slightly small communication hole and regulates the position of the pipe P and the pipe Pa is formed. 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 insertion ports 16 and 17 into contact with the step portion 18.

  A cam surface 19 is formed at the distal end portion of the shaft portion 14, that is, the inlet portion of the insertion port 16. As shown in FIG. 2, the cam surface 19 is formed in a conical surface that is continuous with the insertion port 16 on the front side and has a diameter that increases toward the rear side (the coupling member 2 side). The conical surface is formed such that the inclination angle of the axial center side portion with respect to the axial center is larger than the inclination angle of the outer peripheral side portion with respect to the axial center.

As shown in FIG. 1, the coupling member 2 is formed with a through-hole 21 through which piping is formed in the axial center portion of the base 25, and a disk-shaped slit 22 having a radial cut so as to bisect the coupling member 2. Is formed. On the front side (joint body side) of the disk-shaped slit 22, a pipe connection portion 23 is formed which is screwed into the joint body 1 and includes the constituent members of the pipe connection mechanism. Is formed with a grip portion 24 formed so as to be gripped with a general fastening tool. The axial position of the disc-shaped slit 22 is arranged so as to substantially coincide with the position of the coupling member side end portion of the joint body 1 in a state where the coupling member 2 is fastened to the joint body 1 (FIG. 3, see Figure 4)
The pipe connection portion 23 has a base portion 25, and a protective cylinder portion 26 that protects the outer periphery of the ferrule 3 is formed on the joint body side of the base portion 25. On the outer periphery of the base portion 25, a male screw 25a is formed as a screwing portion to be screwed with the joint main 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 fastening tool. Between the disc-shaped slit 22 and the through-hole 21, a tubular connecting portion 27 that connects the tube connecting portion 23 and the gripping portion 24 by a thin tubular portion is formed. The tubular connecting portion 27 is designed to have a strength that allows it to be cut when the rotational torque for tightening the grip portion 24 increases to a predetermined value (rotational torque value for completion of fastening).

  On the surface of the pipe connection portion 23 on the side opposite to the joint body, there are four engagement portions that engage with engagement protrusions 49 (see FIG. 5) of a dedicated tool 45 described later, having a circular cross section and a predetermined depth. Engagement hole portions 41 are formed at equal intervals on a predetermined circumference. The grip portion 24 is formed with a processing hole 42 for enabling the engagement hole portion 41 to be processed from the anti-joint body side of the grip portion 24. The processing holes 42 are processed at positions opposite to the engagement hole portions 41, and four holes are formed at equal intervals on a predetermined circumference.

  The ferrule 3 is an annular object having an insertion hole 31 through which the pipe P is inserted in the shaft center, and is connected to the base portion 25 via a thin portion 28 extending in the radial direction at the rear end portion. Is formed. The thin portion 28 is formed so as to be cut when the rotational torque for fastening the coupling member 2 to the joint body 1 reaches a predetermined value (see FIG. 4). In addition, a space 32 is formed behind the ferrule 3 and the base 25. The space portion 32 is formed in a parallel plane at a constant interval on the inner peripheral side when viewed in a cross section cut in the axial direction, and the outer peripheral side tip is formed in a substantially triangular shape. A short side parallel to the axis is formed at the apex of the substantially triangular shape. The front surface of the space portion 32 is the rear end surface of the ferrule 3, and the rear surface of the space portion 32 is the front end surface of the base portion 25. In addition, a rear inclined surface forming a triangular shape on the outer peripheral side of the space portion 32, that is, a conical surface whose diameter decreases toward the rear forms the pressing surface 29 of the ferrule 3.

  In this way, the ferrule 3 connected to the base portion 25 by the thin portion 28 at the rear end portion has a front end surface formed in a small-sized surface perpendicular to the axis as viewed in a cross section cut in the axial direction, The outer peripheral surface is formed as a tapered taper surface 33, and the rear outer peripheral surface is formed as a columnar parallel surface 34 substantially parallel to the axis. The inclination angle of the taper surface 33 with respect to the axial center is formed smaller than the inclination angle of the outer peripheral side portion 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.

  As shown in FIG. 1, the parallel surface 34 that forms the rear outer peripheral surface of the ferrule 3 and the front surface of the thin portion 28 are connected at a substantially right angle when viewed in a cross section cut in the axial direction. The right-angled corner portion forms an edge-shaped cut with respect to the inclined surface portion on the outer peripheral side of the front surface of the space portion 32. By forming this cut, it is configured such that stress concentration is likely to occur in the thin portion 28 when an axial force is applied to the coupling member 2.

  Further, the ferrule 3 is formed with a first notch 35 and a second notch 36 which are cut portions cut in the outer circumferential direction from the inner surface of the insertion hole 31. The first notch 35 is formed at the tip in the axial direction, and the second notch is formed after the axial direction.

  The first notch 35 is for facilitating deformation of the tip portion 38 located in front of the first notch 35. The first notch 35 is formed so that the cross-sectional shape cut in the axial direction is a right triangle, and the rear cut surface, that is, the rear surface is perpendicular to the axial center. As a result, a thin portion 35 a is formed between the first notch 35 and the tapered surface 33 of the ferrule 3, and a tip portion 38 in front of the first notch 35 is easily bent toward the pipe P. The distal end portion 38 is inserted in a wedge shape between the pipe P and the insertion port 16 while being bent from the first notch 35 in the initial fastening stage in which the coupling member 2 is tightened by hand, and temporarily fixes the pipe P ( (See FIG. 2 (a)).

  The front edge 3 a is formed at a corner where the rear cut surface of the first notch 35 and the inner surface of the insertion hole 31 intersect. Moreover, the front edge part 3a performs the seal | sticker of the ferrule 3 and the piping P, and piping holding | maintenance by biting into the piping P (refer FIG.2 (b)).

  The second notch 36 is formed at a position from the rear end surface between the first notch 35 and the rear end surface in the axial direction. The second notch 36 has a substantially triangular shape with a short side on the outer peripheral side, and is formed in a substantially triangular shape that is the same as the pointed portion of the space portion 32 described above. That is, the above-described space portion 32 has a shape in which both substantially triangular lower ends of the second notch 36 are connected to a plane perpendicular to the axis. Further, since the second notch 36 is formed, a thin portion 36 a is formed between the outer peripheral side of the second notch 36 (that is, the side of the tip) and the rear parallel surface 34 of the ferrule 3. ing. Thus, by forming the thin portion 36a on the outer peripheral side of the second notch 36, the ferrule 3 is formed so that the front and rear portions can be easily bent to the axial center side by using the thin portion 36a as a hinge. . As a result, the tapered surface 33 at the front portion of the ferrule 3 is easily adhered to the cam surface 19. Moreover, it becomes easy to deform | transform so that the rear edge part 3b of the rear-end surface of the ferrule 3 may bite into the piping P, and the amount of biting into the pipe P by the rear edge part 3b becomes large. The rear edge portion 3b holds the pipe P so as not to come out, suppresses the vibration of the pipe P from being transmitted to the front edge portion 3a, and performs a sealing function and a pipe holding function by biting the front edge portion 3a. Has a function of maintaining high (see FIG. 2C).

  The pipe joint portion of the bite type pipe joint according to the present embodiment refers to a structure in which the coupling member 2 is fastened to the joint body 1 in the above description and the pipe P is connected, and the pipe connection structure according to the present invention is as described above. This is the structure of a simple pipe joint.

  In the above configuration, the pipes Pa and P are formed of copper pipes, and the joint body 1, the coupling member 2, and the ferrule 3 are formed of a brass material. These are optimal and versatile as materials for refrigeration equipment.

Next, a pipe connection method in the bite type pipe connection structure configured as described above will be described with reference to FIGS.
Prior to connecting the pipe P, the joint body 1 is attached to the pipe Pa as a connecting portion derived from the connected device. For connection of the pipe P, first, the pipe P is inserted into the through hole 21 of the coupling member 2, and the coupling member 2 is externally attached to the pipe P. And the front-end | tip part of the piping P is inserted in the insertion port 16 through the insertion hole 31 of the ferrule 3, and the coupling member 2 is screwed by the joint main body 1 in the state which contact | abutted the front-end | tip to the step part 18. FIG. This state is shown in FIG.

  When the coupling member 2 is continuously tightened by hand from this state, the tip portion 38 of the ferrule 3 comes into contact with the cam surface 19. Further, when the coupling member 2 is further tightened by hand, since the thin portion 35a is formed at the upper portion of the first notch 35, the tip portion 38 is easily bent toward the pipe P, and the tip portion of the ferrule 3 38 is inserted in a wedge shape between the pipe P and the insertion port 16, and the pipe P is temporarily fixed.

  In the subsequent tightening, the taper surface 33 of the rear outer peripheral portion of the first notch 35 of the ferrule 3 comes into contact with the cam surface 19 so that the rotational torque increases. Therefore, in a subsequent process from this stage, the coupling member 2 is fastened to the joint body 1 by engaging a general fastening tool with the grip portion 24. By this tightening, the coupling member 2 is tightened in a state where the tip of the ferrule 3 is pressed against the cam surface 19. As a result, a forward force in the axial direction acts on the thin portion 28. At this time, stress concentration occurs at the intersection of the outer peripheral surface of the ferrule 3 and the front surface of the thin portion 28, that is, the thin portion 28 having a cut, and this thin portion 28 is cut, and the outer peripheral end of the rear end surface is It contacts the pressing surface 29 (see FIG. 2B). The ferrule 3 acts in the same manner as the independent ferrule 3 after being separated from the coupling member 2.

  In the ferrule 3, when the coupling member 2 is further tightened, the outer peripheral side end of the rear end surface is pressed by the pressing surface 29 in a state where the front end is pressed against the cam surface 19. The pressing force from the pressing surface 29 is a conical surface whose diameter decreases as the pressing surface 29 goes rearward, and thus is a forward and axial force. Therefore, since the thin portion 36a is formed on the outer peripheral side of the second notch 36 in the ferrule 3, the respective portions before and after the second notch 36 are bent toward the axial center side by using the thin portion 36a as a hinge. Thereby, the tapered surface 33 of the ferrule 3 is easily pressed against the cam surface 19. Further, the rear edge portion 3b of the ferrule 3 can greatly bite into the pipe P. Further, at the front portion of the ferrule 3, the tapered surface 33 behind the front edge portion 3a is guided by the cam surface 19 and further bent toward the axial center side. Thereby, the front edge portion 3a can greatly bite into the pipe P, and the contact force and the contact area with which the tapered surface 33 is in close contact with the cam surface 19 are increased (see FIG. 2C).

  Then, when the biting of the rear edge portion 3b and the front edge portion 3a reaches a predetermined amount, as shown in FIG. 3, the end portion of the female screw cylinder portion 13 of the joint body 1 and the surface of the joint body side of the disc-shaped slit 22 The positions of the disk-shaped slits 22 are set so that they substantially coincide with each other. Further, when this state is reached, the rotational torque reaches a predetermined value, and as shown in FIG. 4, the tubular connecting portion 27 is cut and protrudes from the female screw cylinder portion 13 of the joint body 1. The grip part 24 is cut. Thereby, the fastening process of the coupling member 2 is completed. Therefore, in the present embodiment, when the pipe connection work is completed, the grip portion 24 is cut as shown in FIG. Further, after this, no one can easily loosen the pipe connecting portion 23 to remove the pipe P.

  However, in the present embodiment, as shown in FIG. 6, the end portion of the piping heat insulating material 51 of the piping P is extended and expanded with respect to the grip portion 24 in a state separated from the pipe connecting portion 23, This is used as a cover 52 to cover and hide the grip portion 24. The end portion of the cover 52 is fixed to the grip portion 24 by an appropriate means such as an adhesive tape and is fixed to the pipe P. The heat insulating material 51 for piping may be the above-described conventionally known material, for example, a soft heat insulating tubular body whose surface is covered with a soft synthetic resin sheet, and the piping is inserted from the surface inside when being installed on the piping. In order to be able to do, the notch penetrated from the outer surface to the inner surface toward the axial direction of the piping P is provided. Further, a tongue piece coated with an acrylic adhesive material is provided at the end of the cut, and is adhered to the outer surface so as to close the cut. Closed cell radiation cross-linked polystyrene is used as the soft heat insulating tubular body, and vinyl chloride is used as the soft synthetic resin sheet.

Next, when it becomes necessary to redo the piping, the piping can be removed using a special dedicated tool.
The dedicated tool 45 is, for example, as shown in FIG. 5, and a handle portion 47 is attached to a semi-disc-shaped base portion 46. In addition, a semicircular hole 48 is formed in the base portion 46, and three columnar engagements are provided on the side surface of the base portion 46 as engaging portions to be engaged with the engaging hole portions 41 of the pipe connection portion 23. A mating protrusion 49 is formed. The inner circumferential radius of the semicircular hole 48 is formed to be slightly larger than the tubular connecting portion 27. Further, three columnar engaging protrusions 49 are formed on the side surface of the base portion 46. The engaging protrusions 49 are formed so as to be engageable with any three adjacent four of the four engaging hole portions 41 of the pipe connecting portion 23.

  When the pipe P is removed, the engagement protrusions 49 of the dedicated tool 45 configured in this way are engaged with any three adjacent engagement hole portions 41 of the pipe connection portion 23, The base portion 46 is rotated by applying a force to the handle portion 47. Thereby, the pipe connection part 23 can be rotated and the screwing with the joint main body 1 can be loosened. Further, the pipe P remaining in the bite type pipe joint can be removed from the joint body 1 by loosening the screw connection between the pipe connecting portion 23 and the joint body 1. Further, by removing the pipe P and the pipe connection portion 23, the new pipe P can be connected to the joint body 1 using the new coupling member 2.

The pipe connection structure according to the present embodiment configured as described above has the following effects.
(1) When the joint body 1 and the coupling member 2 are fastened, the connection of the pipe P is completed when the rotational torque for fastening the joint member 2 reaches a predetermined value, and the gripping part is gripped by a general fastening tool. 24 is separated. Accordingly, a general fastening tool cannot be used after the connection is completed, and anyone cannot easily loosen the threaded portion of the pipe joint or remove the pipe P by loosening the threaded portion. As a result, inadvertent refrigerant gas leakage and release to the atmosphere are avoided.

  (2) Since the separated gripping part 24 is covered with the cover 52 in a state of being covered with the pipe P, the gripping part 24 is not exposed on the pipe P. As a result, since it looks like a pipe connection structure that does not have the gripping portion 24, there is a sense of security that does not cause the viewer to easily loosen the joint portion.

  (3) If the gripping part 24 is left on the pipe P after connecting the pipe, it is considered that the gripping part 24 generates noise due to vibration of the pipe P. Noise can be suppressed. Further, the appearance is improved as compared with the case where the grip portion 24 is left naked.

  (4) The grip portion 24 is covered with the end portion of the expanded pipe heat insulating material 51 as a cover 52 in a state of being separated from the pipe connection portion 23 screwed into the joint body 1. Therefore, the grip portion 24 can be covered without using a dedicated cover, and the cost can be reduced.

  (5) The pipe connection structure according to the present embodiment can be applied to a bite type pipe connection structure in a valve such as a pipe joint or a shut-off valve, as is apparent from the above description. In addition, pipe fittings and valves that employ the above bite type pipe and pipe connection structure, or refrigeration systems using these pipe fittings and valves, can be easily loosened after connecting one end of the pipe. Can not be. In addition, since the separated grip portion is covered without being left on the pipe, noise due to vibration is suppressed and appearance is improved.

(Embodiment 2)
In the second embodiment, as shown in FIG. 7, instead of the cover 52 in the first embodiment, the grip portion 24 is covered with a dedicated cover 53 formed separately from the piping heat insulating material 51. The material of the dedicated cover 53 may be a sheet or the same material as the heat insulating material 51 for piping. In addition, as a material for the dedicated cover 53, an elastic material or a heat-shrinkable material can be used. If an elastic material or a heat-shrinkable material is used, it becomes easy to adapt to the outer shape of the grip portion 24. In addition, the edge part of the cover 53 is fixed to the holding part 24 and the piping P by appropriate means, such as an adhesive tape. In the case of Embodiment 2, since it is formed so as to be covered by the dedicated cover 53, it can be covered separately from the construction work of the heat insulating material 51 for piping. In FIG. 7, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

(Embodiment 3)
In the third embodiment, as shown in FIG. 8, the end portion of the heat insulating material 51 for piping is extended and expanded in the same manner as the cover 52 in the first embodiment, and this is used as a cover 54. The grip portion 24 is covered by the cover 54 together with the tube connection portion 23 in a state where the tube connection portion 23 is screwed into the female screw cylinder portion 13 of the joint body 1 and is in contact with the tube connection portion 23 from the rear side. It is hidden. In this case, the whole of the cover 54 is firmly fixed by fixing the end portion to the outer surface of the female screw cylinder portion 13 of the joint body 1. Further, an engagement hole 41 as an engagement portion for engaging the dedicated tool 45 is formed on the surface of the pipe connection portion 23 on the side opposite to the joint body. The engagement hole 41 is also covered by the cover 54. Since it is hidden, it can avoid loosening the pipe connection part 23 more reliably and easily. In FIG. 8, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

(Embodiment 4)
In the fourth embodiment, as shown in FIG. 9, the cover 54 in the third embodiment is a dedicated cover 55 as in the second embodiment. The material of the dedicated cover 55 may be the same as that in the second embodiment. Note that one end of the cover 55 is fixed to the female screw cylinder portion 13 by an appropriate means such as an adhesive tape, and the other end is fixed to the pipe P. In the case of Embodiment 4, since it is covered with the exclusive cover 55, it can be covered separately from the construction work of the heat insulating material 51 for piping. In FIG. 9, the same reference numerals are given to the same or corresponding components as those in the first embodiment, and the description thereof is omitted.

(Embodiment 5)
In the fifth embodiment, as shown in FIG. 10, the dedicated cover 53 in the second embodiment is replaced with a dedicated cover 56 that is a resin molded product. The dedicated cover 56 is a molded heat insulating material formed so as to have an inner surface shape substantially along the outer shape of the grip portion 24. The material of the dedicated cover 56 is not particularly limited as long as it can be molded and has a heat insulating property, but is preferably a molded product of a thermoplastic resin foam material because it is excellent in moldability, heat insulating property, and light weight. The molded article of the thermoplastic resin foam material may be one obtained by thermoforming a thermoplastic resin foam sheet or one obtained by molding thermoplastic resin foam particles in a mold. Examples of the thermoplastic resin foam include foamed polystyrene, foamed polyethylene, foamed polyphenylene ether, foamed polypropylene, foamed polyethylene terephthalate, foamed α-methylstyrene, foamed paramethylstyrene, and foamed crosslinked polyethylene. When a dedicated cover 56 made of such a molded heat insulating material is used, the gripper can be covered simply by fitting the dedicated cover 56 in an appropriate position and fixing it with an appropriate means such as an adhesive tape. improves. In FIG. 10, the same or corresponding components as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

(Embodiment 6)
In the sixth embodiment, as shown in FIG. 11, the dedicated cover 55 in the fourth embodiment is replaced with a dedicated cover 57 that is a resin molded product. The dedicated cover 57 is a molded heat insulating material formed so as to have an inner surface shape substantially along the outer shape from the grip portion 24 to the end of the joint body 1. The material of the dedicated cover 57 may be the same as that described in the fifth embodiment. When the dedicated cover 57 made of such a molded heat insulating material is used, the grip portion 24 and the end of the joint body 1 are simply fitted into the appropriate position and fixed by an appropriate means such as an adhesive tape. Since it can cover, workability | operativity improves. In FIG. 11, the same or corresponding components as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

(Modification)
(1) Although the present embodiment describes a refrigeration apparatus such as an air conditioner as an example, the present invention is not limited to such a refrigeration apparatus, but other water piping, hydraulic piping, and the like. It can also be applied to applications.

  (2) The cover 52, 53, 54, 55, 56, 57 in each embodiment uses a heat insulating material because the pipe connection structure is for a refrigeration apparatus, but it is not necessary to insulate the pipe. In that case, it is not necessary to be concerned with heat insulation.

(3) Each of the above embodiments is a bite type pipe connection structure, but this may be changed to a flare type pipe connection structure.
(4) Moreover, although the ferrule is made into the unitary thing integrally molded by the coupling member, it is good also as an independent type manufactured separately from a coupling member. The independent ferrule may be a single type or a combination of a plurality of members.

  (5) The coupling member 2 is integrally manufactured in a state in which the tube connecting portion 23 and the gripping portion 24 are connected by the tubular connecting portion 27, but the tube connecting portion 23 and the gripping portion 24 are formed by the tubular connecting portion 27. It is also possible to adopt a structure in which the joint is separated by an engagement means such as bonding or meshing, and the joint is separated when the rotational torque at which the fastening operation of the coupling member is completed.

(6) In each of the above-described embodiments, only the object that transmits the rotational torque when the coupling member 2 is fastened to the tubular connecting portion 27 and divides it has been described. That is,
When the rotational torque for fastening the coupling member 2 reaches a predetermined value, the sealing performance and holding force of the pipe P are satisfied, and thus the fastening of the coupling member 2 to the joint body 1 is finished. At this time, the tubular connecting portion 27 is not divided yet and can be tightened. In this case, the rotational torque is managed by the rotation angle of the coupling member 2 or the position of the coupling member 2 as in the conventional case. And it can also divide | segment by applying the force of the holding part 24 axial direction after completion of a retightening process. As a method of applying force, the gripping portion 24 is hit in the axial direction with a fastening tool, or the gripping portion 24 is sandwiched between tools such as pliers and is repeatedly pulled or bent in the longitudinal direction of the shaft center. It can also be a method. In any case, the pipe connection work is completed through a process in which the tubular connecting portion 27 is divided.

  (7) In each embodiment, the connection with the connected side device is formed in the socket portion 12 that brazes the pipe Pa as the connecting portion derived from the connected side device. It is good also as what was provided with the joint part by which the external thread was formed in the outer periphery.

  (8) In the present embodiment, the coupling structure and the pipe connection method between the joint body 1 and the coupling member 2 may be appropriately changed without departing from the spirit of the present invention.

It is a fragmentary sectional view of the bite type pipe joint concerning Embodiment 1 of the present invention, and is a state figure at the time of a fastening start. It is sectional drawing around the ferrule which shows the fastening process of the same bite type pipe joint, (a) is a state figure at the time of pipe temporary fixing, (b) is a state figure by which the thin part was cut | disconnected, (c ) Is a state diagram in which the front edge portion and the rear edge portion are bitten. It is a fragmentary sectional view at the time of piping connection in the bite type pipe joint, and is a state diagram immediately before completion of fastening. It is a fragmentary sectional view at the time of piping connection in the same bite type pipe joint, and is a state diagram after completion of fastening. It is an outer diameter figure of the exclusive tool used for the bite type pipe joint. It is a state figure in which the grip part was covered with the cover in the bite type pipe joint. 6 is a state diagram in which a gripping portion is covered with a cover in a bite type pipe joint according to Embodiment 2. FIG. FIG. 10 is a state diagram in which a grip portion and an end of a joint body are covered with a cover in a bite type pipe joint according to a third embodiment. FIG. 10 is a state diagram in which a grip portion and an end of a joint body are covered with a cover in a bite type pipe joint according to a fourth embodiment. FIG. 10 is a state diagram in which a grip portion is covered with a cover in a bite type pipe joint according to a fifth embodiment. In the bite type pipe joint according to the sixth embodiment, the grip part and the end part of the joint body are covered with a cover.

Explanation of symbols

  P ... pipe, 1 ... joint body, 2 ... coupling member, 21 ... through hole, 22 ... disc-shaped slit, 23 ... pipe connecting part, 24 ... grip part, 27 ... tubular connecting part, 51 ... heat insulating material for pipe, 52 , 53, 54, 55, 56, 57 ... cover.

Claims (10)

A joint body attached to the connected device for connecting the pipe, and a coupling member that is externally attached to the pipe connected to the joint body and fastened to the joint body;
The joint body has a screwing portion for screwing the coupling member,
The coupling member includes a threaded portion that is screwed to the joint body, a through hole that penetrates a pipe that passes through the axial center, a disk-shaped slit having a radial cut to bisect the coupling member, and a disk-shaped slit Is located on the joint body side of the pipe and is screwed into the joint body, and is located on the anti-joint body side of the pipe connection mechanism and the disc-shaped slit and held by a general fastening tool. A gripping portion formed so as to be possible, and a tubular connecting portion that connects the tube connecting portion and the gripping portion by a thin tubular portion formed between the disc-shaped slit and the through-hole,
The gripping part is separated from the pipe connection part by dividing the tubular connecting part in the process of pipe connection, and is covered with a cover in a state of being covered with the pipe after being separated. Pipe connection structure.   The gripping portion is covered with an end portion of the expanded piping heat insulating material in a state of being separated from the pipe connecting portion screwed into the joint body, and is covered with the cover. 1. The pipe connection structure according to 1.   The gripping part is covered with the end of the expanded piping heat insulating material in a state of being in contact with the pipe connecting part, and is covered together with the coupling member side end of the joint body by the cover. The pipe connection structure according to claim 1.   2. The pipe according to claim 1, wherein the grip part is covered with a dedicated cover formed separately from other members in a state of being separated from the pipe connection part screwed into the joint body. Connection structure.   2. The grip portion is covered with a coupling member side end portion of a joint body by a dedicated cover formed separately from other members in a state in which the grip portion is in contact with the pipe connection portion. The pipe connection structure described.   6. The pipe connection structure according to claim 4, wherein the dedicated cover is formed of a resin molded product substantially along an outer shape of a portion covered with the cover.   The valve which used the pipe connection structure of any one of Claims 1-6 for the pipe connection part.   The pipe joint which used the pipe connection structure of any one of Claims 1-6 for the pipe connection part.   A refrigeration apparatus using the valve according to claim 7 in a refrigerant circuit.   A refrigeration apparatus using the pipe joint according to claim 8 in a refrigerant circuit.

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