JP2009068564A

JP2009068564A - Bite-in type pipe connection structure, valve, bite-in type pipe joint and refrigerating apparatus

Info

Publication number: JP2009068564A
Application number: JP2007235989A
Authority: JP
Inventors: Haruo Nakada; 春男中田
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2007-09-11
Filing date: 2007-09-11
Publication date: 2009-04-02
Anticipated expiration: 2027-09-11
Also published as: JP4858372B2

Abstract

PROBLEM TO BE SOLVED: To provide a bite-in type pipe connection structure of integrating a ferrule into a joining member while having an advantage when using two independent ferrules, and a valve, a bite-in type pipe joint, and a refrigerating apparatus using the structure. SOLUTION: The ferrule 3 is positioned by interposing a space part 32 of a predetermined distance in the axial direction to a pressing surface 25 formed in the joining member 2, and is connected to the joining member 2 via a first thin part 4 forming a surface shape in the substantially radial direction. In the ferrule 3, a first notch 35 being a cutout part from the axial side is formed in an intermediate part in the axial direction, and a second thin part 37 is formed between the first notch 35 and an outer peripheral surface of the ferrule 3. The first thin part 4 and the second thin part 37 are cut in a fastening process of the joining member 2. In a process on and after its cutting, a front side part 3B in front of the second thin part 37 is made to function as an independent front ferrule, and a rear side part 3A in the rear of the second thin part 37 is made to function as an independent back ferrule, respectively. COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、食い込み式管接続構造に関し、特に、フロントフェルールとバックフェルールとを備えた食い込み式管接続構造に関する。さらに、本発明は、このような食い込み式管接続構造を用いた弁、食い込み式管継手、及び冷凍装置に関する。 The present invention relates to a bite type pipe connection structure, and more particularly to a bite type pipe connection structure provided with a front ferrule and a back ferrule. Furthermore, the present invention relates to a valve, a bite type pipe joint, and a refrigeration apparatus using such a bite type pipe connection structure.

近年、冷凍装置の分野においては使用圧力が高い冷媒が多く用いられるようになり、食い込み式管接続構造を管接続部に用いた食い込み式管継手の研究が進められている。このような食い込み式管継手としては、一般的に、１個の独立フェルールを用いるものと、フロントフェルールとバックフェルールの２個の独立フェルールを組み合わせて用いるものとがある。前者の例としては特許文献１があり、後者の例としては特許文献２があるが、これらには一長一短がある。１個の独立フェルールを用いるものは、２個の独立フェルールを組み合わせて用いるものに比し、部品点数が少なくなり、部品管理工数が少なくなる点で好ましい。また、２個の独立フェルールを組み合わせて用いるものは、フロントフェルールとバックフェルールの２箇所で配管に食い込むように構成されるため、１個の独立フェルールを用いるものに比し、シール性能及び配管支持力が大きくなる点で好ましい。また、２個の独立フェルールを組み合わせて用いるものは、継手本体とフェルールの中心軸とがずれている場合でも、２個のフェルールそれぞれが中心軸に対し調整されるため、１個の独立フェルールを用いるものに比し中心軸のずれによる漏れが少なくなるという利点がある。 In recent years, in the field of refrigeration equipment, a refrigerant having a high working pressure is often used, and research on a bite type pipe joint using a bite type pipe connection structure as a pipe connection part has been advanced. As such a bite type pipe joint, there are generally one using one independent ferrule and one using a combination of two independent ferrules of a front ferrule and a back ferrule. Patent Document 1 is an example of the former, and Patent Document 2 is an example of the latter, but these have advantages and disadvantages. The use of one independent ferrule is preferable in that the number of parts is reduced and the number of parts management man-hours is reduced as compared with the case where two independent ferrules are used in combination. Also, the combination of two independent ferrules is configured to bite into the pipe at two locations, the front ferrule and the back ferrule, so that it has sealing performance and pipe support compared to the one using one independent ferrule. This is preferable in that the force is increased. In addition, when two independent ferrules are used in combination, even if the joint body and the central axis of the ferrule are misaligned, each of the two ferrules is adjusted with respect to the central axis. There is an advantage that leakage due to the shift of the central axis is reduced as compared with the one used.

しかし、１個の独立フェルールを用いるものについても、独立のフェルールが継手本体及び結合部材とは別体に構成されるため、なお部品点数が多いという問題があった。また、１個の独立フェルールを用いるもの及び２個の独立フェルールを組み合わせて用いるもの何れについても、配管接続作業においてフェルールを配管に外装する必要があり手間がかかるという問題があるとともに、部品保管時や配管接続作業時においてフェルールを紛失したり、落としてシール面を傷つけたりするおそれがあった。 However, even in the case of using one independent ferrule, there is a problem that the number of parts is still large because the independent ferrule is configured separately from the joint body and the coupling member. In addition, both the one using one independent ferrule and the one using a combination of two independent ferrules have a problem in that it is necessary to put the ferrule on the pipe in pipe connection work, and it takes time and trouble. There was a risk of losing the ferrule or damaging the sealing surface during pipe connection work.

このため、フェルールを結合部材に連結した状態で製作し、継手本体に対し結合部材を締結する工程で、フェルールが分離され、分離された以降の工程で１個の独立フェルールと同様に機能するものが開発されるようになった。このような食い込み式管継手の例として特許文献３がある。この食い込み式管継手によれば、部品管理工数を削減するとともに、配管接続時にフェルールを配管上に外装する手間を削減することができ、さらに、部品保管時や配管接続作業時においてフェルールを紛失したり、シール面を傷つけたりするおそれがなくなった。
特開２００３−７４７６９号公報、図５特開平１１−１４１９２１号公報、特表２００４−５２６９１１号公報 For this reason, the ferrule is manufactured in a state of being connected to the coupling member, and the ferrule is separated in the process of fastening the coupling member to the joint body, and functions in the same manner as one independent ferrule in the subsequent processes after the separation. Has been developed. There exists patent document 3 as an example of such a bite type pipe joint. According to this bite type fitting, it is possible to reduce the man-hours for parts management and to reduce the trouble of mounting the ferrule on the pipe when connecting the pipe. In addition, the ferrule is lost when storing the parts and connecting the pipe. Or damaging the sealing surface.
Japanese Patent Laid-Open No. 2003-74769, FIG. JP 11-141921 A, JP-T-2004-526911

しかしながら、このようにフェルールを結合部材と一体化したものは、フェルールが分離された後は１個の独立フェルールを用いるものと同様の機能を発揮するものであって、フロントフェルールとバックフェルールの２個の独立フェルールを組み合わせて用いる食い込み式管継手のように、高いシール機能や大きな配管支持力を得るものではなかった。 However, the one in which the ferrule is integrated with the coupling member in this way exhibits the same function as that using one independent ferrule after the ferrule is separated, and the front ferrule and the back ferrule 2 Unlike a bite type pipe joint that uses a combination of individual ferrules, it did not provide a high sealing function or a large pipe support.

本発明は、このような背景の下になされたものであって、２個の独立フェルールを用いる場合の利点を保有しながら、フェルールを結合部材に一体化した食い込み式管接続構造を提供することを目的とする。また、このような食い込み式管接続構造を用いた弁、管継手、及び冷凍装置を提供することを目的とする。 The present invention has been made under such a background, and provides a bite type pipe connection structure in which a ferrule is integrated with a coupling member while retaining the advantages of using two independent ferrules. With the goal. Another object of the present invention is to provide a valve, a pipe joint, and a refrigeration apparatus using such a bite type pipe connection structure.

本発明に係る食い込み式管接続構造は、上記課題を解決するものであって、フェルールの先端部が押し付けられるカム面を備えた継手本体と、フェルールを押し付ける押圧面を備えた結合部材と、継手本体に対し結合部材が螺合されることにより、先端部がカム面に押し付けられるフェルールとを備えた食い込み式管接続構造であって、前記フェルールは、前記押圧面と軸方向に所定距離の空間部を介在させる位置において、結合部材に対し略径方向に面状を成す第１薄肉部を介し連結されるとともに、結合部材の締付工程において前記第１薄肉部が切断されるように形成され、さらに、前記フェルールは、軸方向中間部に第１ノッチが形成されることにより第１ノッチとフェルールの外周表面との間に第２薄肉部が形成され、結合部材の締付工程において第２薄肉部が切断されるように形成され、前記第１薄肉部及び第２薄肉部が切断された後の工程において第２薄肉部前方の前側部分がフロントフェルールとして機能し、第２薄肉部後方の後側部分がバックフェルールとして機能するように構成されていることを特徴とする。なお、この明細書において前後方向をいうときは、継手本体のある側を前とし、結合部材のある側を後側とする。 The bite type pipe connection structure according to the present invention solves the above-mentioned problem, and includes a joint body provided with a cam surface against which the tip of the ferrule is pressed, a coupling member provided with a pressing surface for pressing the ferrule, and a joint A bite type pipe connection structure including a ferrule whose tip is pressed against a cam surface by screwing a coupling member to a main body, wherein the ferrule is a space a predetermined distance in the axial direction from the pressing surface. In the position where the portion is interposed, the first thin portion is connected to the coupling member via a first thin portion having a surface shape in a substantially radial direction, and the first thin portion is cut in the fastening process of the coupling member. Further, the ferrule has a first notch formed in an axially intermediate portion, whereby a second thin portion is formed between the first notch and the outer peripheral surface of the ferrule, and the coupling member is tightened. In the process, the second thin part is formed to be cut, and in the process after the first thin part and the second thin part are cut, the front part in front of the second thin part functions as a front ferrule, The rear portion behind the thin portion is configured to function as a back ferrule. In this specification, when referring to the front-rear direction, the side with the joint body is the front, and the side with the coupling member is the rear.

このような構成上の特徴を有する本発明に係る食い込み式管接続構造によれば、フェルールは、第２薄肉部が切断されることにより分割されるとともに、第１薄肉部が切断されることにより結合部材から分離される。また、このように分割、分離されたフェルールは、第２薄肉部前方の前側部分が独立のフロントフェルールと同様に作用し、第２薄肉部後方の後側部分が独立のバックフェルールと同様に作用する。この結果、本発明に係る食い込み式管接続構造は、従来のフロントフェルールとバックフェルールの２個の独立フェルールを組み合わせて用いるものと同様のシール機能及び配管支持機能を発揮し、高いシール性能及び大きな配管支持力を得ることができる。また、この食い込み式管接続構造は、フェルールが結合部材と一体的に製作されているので、部品点数が少なくなり、部品管理工数が削減されるとともに、配管接続工数が削減される。また、この食い込み式管接続構造によれば、フェルールが結合部材と一体的に製作されるため、部品保管時或いは配管接続時においてフェルールを紛失したり、フェルールを地上などに落としてシール面を傷付けたりするというおそれを解消することができる。 According to the bite type pipe connection structure according to the present invention having such a structural feature, the ferrule is divided by cutting the second thin part and by cutting the first thin part. Separated from the coupling member. Further, the ferrule divided and separated in this way operates in the same manner as an independent front ferrule in the front portion of the second thin portion, and acts in the same manner as an independent back ferrule in the rear portion of the second thin portion. To do. As a result, the bite type pipe connection structure according to the present invention exhibits the same sealing function and pipe supporting function as those used in combination of two independent ferrules of the conventional front ferrule and back ferrule, and has high sealing performance and large Piping support force can be obtained. Further, in this bite type pipe connection structure, since the ferrule is manufactured integrally with the coupling member, the number of parts is reduced, the part management man-hour is reduced, and the pipe connection man-hour is reduced. Also, according to this bite-in type pipe connection structure, since the ferrule is manufactured integrally with the coupling member, the ferrule is lost when parts are stored or the pipe is connected, or the ferrule is dropped on the ground or the like, and the sealing surface is damaged. The fear of being lost can be resolved.

また、前記フェルールは、第２薄肉部が第１薄肉部より先に切断されるように形成されていることが好ましい。このように構成すると、第２薄肉部が先に切断されることにより後側部分の姿勢が崩れる前に、後側部分の前端面を前側部分の後端面に当接させることができる。したがって、両者の組み合わせ姿勢を適切に形成することが容易になる。 Moreover, it is preferable that the said ferrule is formed so that a 2nd thin part may be cut | disconnected ahead of a 1st thin part. If comprised in this way, before the attitude | position of a rear side part collapse | crumbles by cut | disconnecting a 2nd thin part first, the front-end surface of a rear part can be contact | abutted with the rear-end surface of a front part. Therefore, it becomes easy to appropriately form a combination posture of both.

また、この場合において、前記押圧面は、軸心側が後方となる傾斜面に形成され、前記第１ノッチは、軸方向に切断した断面において、軸心に平行な軸心側の辺と軸心に平行な外周側の辺とを有し、かつ前者の方が後者より大きい略台形を成すように形成され、第１ノッチの前面は、軸心側が前方となる傾斜面に形成され、前記フェルールは、先端部に配管外周面とフェルールとの間をシールするように配管に食い込む前エッジ部が形成されるとともに、後端部に配管を支持するように配管に食い込む後エッジ部が形成されていることが好ましい。このように構成すれば、バックフェルールとして機能する後側部分の後端部が軸心方向に向いた斜め方向の力で押圧される。これにより、後側部分の後端、すなわち後エッジ部が配管に食い込み、配管を支持する。また、第１ノッチは軸方向に切断した断面で見て台形を成すとともに、前面が軸心側が前方となる傾斜面に形成されているので、バックフェルールとして作用する後側部分の前端面（第１ノッチの後面）と、フロントフェルールとして作用する前側部分の後端面（第１ノッチの前面）が当接して前側部分が後側部分から外周向きの力を受ける。このとき、前側部分の先端部がカム面に当接しているため、前エッジ部が配管に食い込む力を受ける。この結果、後エッジ部及び前エッジ部の配管への食い込みが大きくなり、シール機能及び配管支持力が向上する。 Further, in this case, the pressing surface is formed as an inclined surface whose rear side is the axial center side, and the first notch has an axial center side and an axial center parallel to the axial center in a cross section cut in the axial direction. The front side of the first notch is formed as an inclined surface whose front side is the axial center side, and the ferrule is formed in such a manner that the former has a substantially trapezoidal shape larger than the latter. The front edge portion that bites into the pipe so as to seal between the outer peripheral surface of the pipe and the ferrule is formed at the front end portion, and the rear edge portion that bites into the pipe so as to support the pipe is formed at the rear end portion. Preferably it is. If comprised in this way, the rear-end part of the rear part which functions as a back ferrule will be pressed with the force of the diagonal direction which turned to the axial direction. Thereby, the rear end of the rear portion, that is, the rear edge portion bites into the pipe and supports the pipe. In addition, the first notch has a trapezoidal shape when viewed in a cross section cut in the axial direction, and the front surface is formed in an inclined surface whose front side is the axial center side. (The rear surface of one notch) and the rear end surface (front surface of the first notch) acting as a front ferrule abut against each other, and the front portion receives an outward force from the rear portion. At this time, since the front end portion of the front portion is in contact with the cam surface, the front edge portion receives a force that bites into the pipe. As a result, the biting of the rear edge portion and the front edge portion into the pipe is increased, and the sealing function and the pipe support force are improved.

また、前記フェルールは、先端部が先細となるように前方の外周面がテーパ面に形成され、このテーパ面と、前記第１ノッチにおける外周側面と前面とが交差するコーナ部との間に第２薄肉部を形成することが好ましい。このように構成すれば、第２薄肉部を形成するための特別の工程が不要となるため、フェルールの製作工程が簡略化される。また、締付工程において第２薄肉部が切断された後、後側部分の前部に残っている第１ノッチにおける外周側の辺を構成する外周側面が前側部分の上に乗り上げる状態となって、後側部分の前端面（第１ノッチにおける後面）が前側部分の後端面（第１ノッチにおける前面）に当接する状態となる。したがって、結合部材がさらに締め付けられたときに、後側部分が後方を下方とする傾斜状態となりやすくなっている。なお、バックフェルールとして機能する後側部分が軸心側に傾斜すると、前側部分の後端面を前向き、かつ押し上げるような力が後側部分から伝達される一方、前側部分の先端部はカム面に当接されているので、フロントフェルールとして機能する前側部分の先端が軸心側に傾斜しやすくなる。また、その結果として後エッジ部及び前エッジ部の配管への食い込みを大きくすることができ、シール機能及び配管保持器能を向上させることができるようになる。 In addition, the ferrule has a front outer peripheral surface formed in a tapered surface so that a tip end thereof is tapered, and the ferrule is formed between the tapered surface and a corner portion where the outer peripheral side surface and the front surface intersect in the first notch. It is preferable to form two thin portions. If comprised in this way, since the special process for forming a 2nd thin part will become unnecessary, the manufacturing process of a ferrule is simplified. In addition, after the second thin portion is cut in the tightening step, the outer peripheral side constituting the outer peripheral side of the first notch remaining in the front portion of the rear portion is in a state of riding on the front portion. The front end surface of the rear portion (the rear surface in the first notch) comes into contact with the rear end surface of the front portion (the front surface in the first notch). Therefore, when the coupling member is further tightened, the rear portion is likely to be in an inclined state with the rear facing downward. When the rear part that functions as the back ferrule is inclined toward the axial center, a force that forwards and pushes up the rear end surface of the front part is transmitted from the rear part, while the front end of the front part is directed to the cam surface. Since they are in contact with each other, the front end of the front portion that functions as a front ferrule is easily inclined toward the axial center. Further, as a result, the biting of the rear edge portion and the front edge portion into the pipe can be increased, and the sealing function and the pipe holder performance can be improved.

また、上記第２薄肉部の構造に代えて次のようにすることもできる。すなわち、前記フェルールは、先端部が先細となるように前記前側部分の外周面がテーパ面に形成されるとともに、このテーパ面に切込部が形成され、この切込部の先端と、前記第１ノッチにおける前面との間に第２薄肉部が形成されているようにしてもよい。このように構成すれば、
結合部材を締め付ける回転トルクが所定値になったときに第２薄肉部が切断されるように、切込部により第２薄肉部を適宜の肉厚に設定することが容易になる。 Moreover, it can replace with the structure of the said 2nd thin part, and can also be performed as follows. That is, in the ferrule, the outer peripheral surface of the front side portion is formed in a tapered surface so that the tip end portion is tapered, and a notch is formed in the tapered surface, and the tip of the notch and the first You may make it the 2nd thin part be formed between the front surfaces in 1 notch. If configured in this way,
It is easy to set the second thin portion to an appropriate thickness by the cut portion so that the second thin portion is cut when the rotational torque for tightening the coupling member reaches a predetermined value.

また、前記フェルールは、先端部に第２ノッチが形成されるとともに、第２ノッチの後面と配管貫通孔の内周面との角部が前エッジ部に形成され、さらに、第２ノッチの前方にある先端部分が、締付工程の第１段階である第２薄肉部が切断される前の手締め工程において、楔状に配管と継手本体との間に押し込まれるように構成されている。このように構成されていると、締め付け開始時の手締め工程により結合部材を締め付けることにより、第２ノッチ前方の先端部分が配管と継手本体との間に押し込まれることにより、工具による締付前に配管が抜けないように、配管を仮固定することができる。 Further, the ferrule has a second notch formed at the tip, and a corner between the rear surface of the second notch and the inner peripheral surface of the pipe through-hole is formed at the front edge, and further, the front of the second notch In the hand tightening process before the second thin wall portion, which is the first stage of the tightening process, is cut, the distal end portion is pushed between the pipe and the joint body in a wedge shape. With this configuration, the front end of the second notch is pushed between the pipe and the joint body by tightening the coupling member by the manual tightening process at the start of tightening, and before tightening by the tool. The pipe can be temporarily fixed so that the pipe does not come off.

また、本発明に係る弁及び食い込み式管継手は、上記何れかの食い込み式管接続構造を管接続部に用いたことを特徴とする。したがって、このような弁及び食い込み式管継手は、管接続部のシール性能及び配管支持力が大きくなり、流体の漏れが少なくなる。また、配管接続工数や部品管理工数が削減される。また、フェルール紛失のおそれやフェルールの表面を傷つけるおそれを解消することができる。 Further, the valve and the bite type pipe joint according to the present invention are characterized in that any of the above bite type pipe connection structures is used for the pipe connection part. Therefore, such a valve and a bite type pipe joint increase the sealing performance and pipe support force of the pipe connection portion, and reduce fluid leakage. In addition, the number of pipe connection man-hours and parts management man-hours are reduced. Moreover, the possibility of losing the ferrule or damaging the surface of the ferrule can be eliminated.

また、本発明に係る冷凍装置は、上記弁或は食い込み式管継手を冷媒回路に用いたことを特徴とする。したがって、本発明に係る冷凍装置は、冷媒漏れが少なくなり信頼性が向上する。 The refrigeration apparatus according to the present invention is characterized in that the valve or the bite type pipe joint is used in a refrigerant circuit. Therefore, in the refrigeration apparatus according to the present invention, refrigerant leakage is reduced and reliability is improved.

本発明に係る食い込み式管接続構造によれば、フロントフェルールとバックフェルールの２個の独立フェルールと同様の機能を発揮することにより、高いシール性能及び大きな配管支持力を得ることができる。また、この食い込み式管接続構造の場合には、フェルールが結合部材と一体的に製作されるので、部品点数が少なくなり、部品管理工数が削減されるとともに、配管接続工数が削減される。また、この食い込み式管接続構造の場合には、部品保管時或いは配管接続時においてフェルールを紛失したり、フェルールを地上などに落としてシール面に傷を付けたりするというおそれを解消することができる。 According to the bite type pipe connection structure according to the present invention, a high sealing performance and a large pipe support force can be obtained by exhibiting the same functions as the two independent ferrules of the front ferrule and the back ferrule. In the case of this bite-in type pipe connection structure, since the ferrule is manufactured integrally with the coupling member, the number of parts is reduced, the number of parts management is reduced, and the number of pipe connections is reduced. Further, in the case of this bite-in type pipe connection structure, it is possible to eliminate the risk of losing the ferrule when storing the parts or connecting the pipe, or dropping the ferrule on the ground or the like to damage the sealing surface. .

（実施の形態１）
実施の形態１に係る食い込み式管接続構造を管接続部に用いた食い込み式管継手について、図１及び図２に基づき説明する。実施の形態１に係る食い込み式管継手は、ヒートポンプ式温水装置の冷媒回路などの冷凍装置の冷媒回路に使用される食い込み式管継手であって、その構成を図１に示す。図１はこの食い込み式管継手の締結開始時の状態における部分断面図である。本食い込み式管継手は、図１に示されるように被接続側機器から導出される配管Ｐ１に取り付けられる継手本体１と、配管Ｐ１に接続されるべき配管Ｐ２に外装されて継手本体１に結合される結合部材２と、結合部材２に一体に形成されたフェルール３とから形成されている。 (Embodiment 1)
A bite type pipe joint using the bite type pipe connection structure according to the first embodiment as a pipe connection part will be described with reference to FIGS. 1 and 2. The bite type pipe joint according to the first embodiment is a bite type pipe joint used for a refrigerant circuit of a refrigeration apparatus such as a refrigerant circuit of a heat pump type hot water apparatus, and its configuration is shown in FIG. FIG. 1 is a partial cross-sectional view of the bite type pipe joint at the start of fastening. As shown in FIG. 1, the bite-in type pipe joint is externally coupled to a joint body 1 attached to a pipe P 1 led out from a connected device and a pipe P 2 to be connected to the pipe P 1. The coupling member 2 is formed, and the ferrule 3 formed integrally with the coupling member 2 is formed.

継手本体１は、図１及び図２に示すように、基部１１の前側にソケット部１２が形成されるとともに、基部１１の外周部の後側に雌ねじ筒部１３が形成され、さらに、基部１１の軸心部の後側に雌ねじ筒部１３内の空間部に突出する軸部１４が形成されている。また、軸部１４の外周側には、配管接続時に後述する結合部材２の保護筒部２４を収納する環状空間部１５が形成されている。そして、基部１１及び雌ねじ筒部１３の外形は、六角ナット状に一体的に形成されている。また、基部１１から軸部１４にかけての軸心部には配管Ｐ２を差し込む差込口１４ａが形成され、基部１１からソケット部１２にかけての軸心部には配管Ｐ１を差し込む差込口１２ａが形成され、さらに、差込口１４ａと差込口１２ａとの間には、やや小径の連通孔を形成するとともに配管Ｐ１，Ｐ２の位置規制を行う段部１６が形成されている。段部１６は、差込口１２ａ、１４ａに差し込まれた配管Ｐ１，Ｐ２の先端部を段部１６に当接させることにより、配管Ｐ１，Ｐ２の先端位置を一定に保持するものである。また、雌ねじ筒部１３内には、結合部材２の螺合部としての雌ねじ１３ａが形成されている。 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. Further, an annular space portion 15 is formed on the outer peripheral side of the shaft portion 14 so as to accommodate a protective cylinder portion 24 of the coupling member 2 described later when the pipe is connected. And the external shape of the base 11 and the internal thread cylinder part 13 is integrally formed in the hexagonal nut shape. Further, an insertion port 14a into which the pipe P2 is inserted is formed in the axial center portion from the base portion 11 to the shaft portion 14, and an insertion port 12a into which the piping P1 is inserted is formed in the axial center portion from the base portion 11 to the socket portion 12. Further, a step portion 16 is formed between the insertion port 14a and the insertion port 12a to form a slightly small communication hole and to restrict the positions of the pipes P1 and P2. The step portion 16 is configured to keep the tip positions of the pipes P1, P2 constant by bringing the tip portions of the pipes P1, P2 inserted into the insertion ports 12a, 14a into contact with the step portion 16. Further, a female screw 13 a as a screwing portion of the coupling member 2 is formed in the female screw cylinder portion 13.

また、軸部１４の先端部、すなわち、差込口１４ａの入口部にはカム面１７が形成されている。カム面１７は、前側において差込口１４ａに連なり、後側（結合部材２側）に向けて径が大きくなる円錐状に形成されている。この円錐状は、軸心側部の軸心に対する傾斜角度が外周側部の軸心に対する傾斜角度より大きくなるように形成されている。 Further, a cam surface 17 is formed at the tip of the shaft portion 14, that is, the inlet portion of the insertion port 14a. The cam surface 17 is connected to the insertion port 14a on the front side, and is formed in a conical shape whose diameter increases toward the rear side (the coupling member 2 side). The conical shape 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.

結合部材２は、基部２２の軸心部に配管貫通孔２１が形成されるとともに、基部２２の前側にはフェルール３が突出するように形成され、さらに、基部２２の後側には外形が六角形状の把持部２３が形成されている。また、基部２２の外周部の前部には、保護筒部２４が延伸するように形成されている。保護筒部２４は、フェルール３の外周を覆い、部品保管時、配管接続時などにおいて、フェルール３のシール面が傷付けられるのを防止する。また、基部２２の外周面には、継手本体の雌ねじ１３ａに螺合される雄ねじ２２ａが形成されている。 The coupling member 2 has a pipe through hole 21 formed in the axial center portion of the base portion 22, a ferrule 3 is formed on the front side of the base portion 22, and a hexagonal outer shape on the rear side of the base portion 22. A grip portion 23 having a shape is formed. Further, a protective cylinder portion 24 is formed at the front portion of the outer peripheral portion of the base portion 22 so as to extend. The protective cylinder part 24 covers the outer periphery of the ferrule 3 and prevents the seal surface of the ferrule 3 from being damaged when parts are stored or when pipes are connected. Further, on the outer peripheral surface of the base portion 22, a male screw 22 a that is screwed into the female screw 13 a of the joint body is formed.

フェルール３は、軸心に配管Ｐ２を貫通させる配管貫通孔３１が形成された環状物であり、後端部において径方向に延びる第１薄肉部４を介し基部２２に連結されており、結合部材２と一体的に形成されている。この第１薄肉部４は、結合部材２を継手本体１に締め付けるときの回転トルクが所定値になったときに切断されるように形成されている。また、フェルール３の後方には、基部２２との間に空間部３２が形成されている。この空間部３２は、軸方向に切断した断面で見て、内周側が軸心に垂直な平面で一定間隔に形成され、外周側が略三角形状に形成されている。また、略三角形の頂点には短い軸心に平行な辺が形成されている。なお、この空間部３２の前面はフェルール３の後端面であり、空間部３２の後面は基部２２の前端面であり、外周側の三角形状を形成する傾斜面、すなわち、軸心側が後方となる傾斜面がフェルール３の押圧面２５を形成している。また、フェルール３の後端面における軸心側角部が後エッジ部３ａを形成する。 The ferrule 3 is an annular member in which a pipe through hole 31 that allows the pipe P2 to pass through the shaft center is formed. The ferrule 3 is connected to the base portion 22 via a first thin portion 4 that extends in the radial direction at the rear end portion. 2 is formed integrally. The first thin portion 4 is formed so as to be cut when the rotational torque when the coupling member 2 is fastened to the joint body 1 reaches a predetermined value. A space 32 is formed behind the ferrule 3 between the base 22 and the base 22. The space 32 is formed in a plane that is perpendicular to the axial center at regular intervals when viewed in a cross section cut in the axial direction, and the outer peripheral side is formed in a substantially triangular shape. In addition, a side parallel to the short 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, the rear surface of the space portion 32 is the front end surface of the base portion 22, and the inclined surface that forms a triangular shape on the outer peripheral side, that is, the axial center side is the rear side. The inclined surface forms the pressing surface 25 of the ferrule 3. Moreover, the axial center side corner | angular part in the rear-end surface of the ferrule 3 forms the rear edge part 3a.

このように後端部において第１薄肉部４で基部２２に連結されたフェルール３は、軸方向に切断した断面で見て、前端面が軸心に垂直な小寸法の面に形成されるとともに、前方外周面が先細のテーパ面３３に形成され、さらに、後方外周面が軸心に略平行な平行面３４に形成されている。 In this way, the ferrule 3 connected to the base portion 22 by the first thin portion 4 at the rear end portion is formed with a small-sized surface whose front end surface is perpendicular to the axis when viewed in a cross section cut in the axial direction. The front outer peripheral surface is formed as a tapered taper surface 33, and the rear outer peripheral surface is formed as a parallel surface 34 substantially parallel to the axis.

フェルール３の後方外周面を形成する平行面３４と第１薄肉部４の前面とは、図２に図示されるように、軸方向に切断した断面で見て略直角に連結されている。また、この直角の角部は、空間部３２の前面の外周側の傾斜面部に対しエッジ状の切込を形成している。この切込が形成されることにより、結合部材２に対し軸方向の力が作用したときに第１薄肉部４に応力集中が発生しやすいように構成されている。 As shown in FIG. 2, the parallel surface 34 that forms the rear outer peripheral surface of the ferrule 3 and the front surface of the first thin portion 4 are connected at a substantially right angle when viewed in a cross section cut in the axial direction. Further, 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 first thin portion 4 when an axial force acts on the coupling member 2.

また、フェルール３には、配管貫通孔３１を形成する内周面から外周方向に切り込まれた切込部である第１ノッチ３５と第２ノッチ３６とが形成されている。第１ノッチ３５は軸方向中間部に形成され、第２ノッチ３６は軸方向の先端部に形成されている。 Further, the ferrule 3 is formed with a first notch 35 and a second notch 36 which are cut portions cut in the outer peripheral direction from the inner peripheral surface forming the pipe through hole 31. The first notch 35 is formed at the intermediate portion in the axial direction, and the second notch 36 is formed at the tip portion in the axial direction.

第１ノッチ３５は、図２に記載のように、軸方向に切断した断面で見て、軸心に平行な軸心側の辺と軸心に平行な外周側の辺とを有し、かつ前者の方が後者より大きい略台形を成すように形成されている。また、第１ノッチ３５における前面３５ａは、軸心側が前方となる傾斜面に形成されるとともに、第１ノッチ３５における後面３５ｂは、軸心側が後方となる傾斜面に形成されている。また、第１ノッチ３５における軸心に平行な外周側の辺を形成する外周側面３５ｃと前面３５ａとが交差するコーナ部と、テーパ面３３との間に第２薄肉部３７が形成されている。この第２薄肉部３７は、結合部材２が継手本体１に締め付けられときの回転トルクが第１薄肉部４が切断されるときの回転トルクより小さい所定値において、切断されるように構成されている。 As shown in FIG. 2, the first notch 35 has an axial side parallel to the axial center and an outer peripheral side parallel to the axial center when viewed in a cross section cut in the axial direction, and The former is formed to be substantially trapezoidal than the latter. Further, the front surface 35a of the first notch 35 is formed as an inclined surface whose front side is the axial center, and the rear surface 35b of the first notch 35 is formed as an inclined surface whose rear side is the axial center. In addition, a second thin portion 37 is formed between the tapered surface 33 and the corner portion where the outer peripheral side surface 35 c forming the outer peripheral side parallel to the axis of the first notch 35 intersects the front surface 35 a. . The second thin portion 37 is configured to be cut at a predetermined value smaller than the rotational torque when the coupling member 2 is fastened to the joint body 1 and when the first thin portion 4 is cut. Yes.

第２ノッチ３６は、この第２ノッチ３６の前方にある先端部分３８の変形を容易にするためのものである。また、第２ノッチ３６は、軸心方向に切断した断面形状が直角三角形であって、後方の切込面、すなわち、後面が軸心と直角となるように形成されている。また、この第２ノッチ３６は、第２薄肉部３７が切断される前の工程、すなわち、結合部材２を手回しで締め付ける工程、すなわち、手締の工程において、第２ノッチ３６前方の先端部分３８を配管Ｐ２と差込口１４ａとの間に楔状に差し込んで配管Ｐ２を仮止め可能としている。また、第２ノッチ３６の後方の切込面（すなわち、後面）と配管貫通孔３１の内周面とが交差する角部が前エッジ部３ｂをなし、この前エッジ部３ｂがフェルール３における先端部の配管Ｐ２への食い込みを行うようになっている（図３（ｄ）参照）。 The second notch 36 is for facilitating deformation of the tip portion 38 in front of the second notch 36. The second notch 36 is formed so that a cross-sectional shape cut in the axial direction is a right triangle, and a rear cut surface, that is, a rear surface is perpendicular to the axial center. Further, the second notch 36 has a front end portion 38 in front of the second notch 36 in the step before the second thin portion 37 is cut, that is, the step of tightening the coupling member 2 by hand, that is, the step of manual tightening. Is inserted in a wedge shape between the pipe P2 and the insertion port 14a so that the pipe P2 can be temporarily fixed. Further, a corner portion where the cut surface (that is, the rear surface) behind the second notch 36 intersects with the inner peripheral surface of the pipe through-hole 31 forms the front edge portion 3 b, and this front edge portion 3 b is the tip of the ferrule 3. Biting into the pipe P2 is performed (see FIG. 3D).

本実施の形態に係る食い込み式管継手の管接続部は、上記説明における継手本体１のカム面１７にフェルール３を押し付けながら、継手本体１に対し結合部材２を締め付けて配管Ｐ２を接続する構造部分をいい、本発明に係る食い込み式管接続構造は、このような管接続部の構造をいう。 The pipe connection portion of the bite type pipe joint according to the present embodiment has a structure in which the pipe P2 is connected by tightening the coupling member 2 to the joint body 1 while pressing the ferrule 3 against the cam surface 17 of the joint body 1 in the above description. The bite type pipe connection structure according to the present invention refers to the structure of such a pipe connection part.

また、以上の構成において、配管Ｐ１，Ｐ２は銅管により形成され、継手本体１、結合部材２及びフェルール３は黄銅製材料から形成されている。これらは、冷凍装置用材料として最適であり、汎用性のあるものである。 In the above configuration, the pipes P1 and P2 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 as materials for refrigeration equipment and are versatile.

次に、以上のように構成される本食い込み式管継手による配管接続方法について、図１及び図３に従い説明する。なお、図３は、本食い込み式管継手の締結工程を示すフェルール周りの断面図である。 Next, a pipe connection method using the bite type pipe joint configured as described above will be described with reference to FIGS. 1 and 3. FIG. 3 is a cross-sectional view around the ferrule showing the fastening process of the bite type pipe joint.

継手本体１に対し配管Ｐ２を接続するに先立ち、継手本体１は被接続側機器から導出される接続部としての配管Ｐ１に取り付けられている。次に、本食い込み式管継手による配管Ｐ２の接続は、結合部材２の配管貫通孔２１に配管Ｐ２を差し込み、結合部材２を配管Ｐ２に外装する。そして、配管Ｐ２の先端部をフェルール３の配管貫通孔３１を通して差込口１４ａに挿入し、その先端を段部１６に当接させた状態として結合部材２を継手本体１に螺合する。この状態が図１及び図３ａである。 Prior to connecting the pipe P 2 to the joint body 1, the joint body 1 is attached to the pipe P 1 as a connection portion derived from the connected side device. Next, connection of the piping P2 by this bite-in type pipe joint inserts the piping P2 in the piping through-hole 21 of the coupling member 2, and coats the coupling member 2 on the piping P2. And the front-end | tip part of the piping P2 is inserted in the insertion port 14a through the piping through-hole 31 of the ferrule 3, and the coupling member 2 is screwed together with the joint main body 1 in the state which contact | abutted the front-end | tip to the step part 16. This state is shown in FIGS. 1 and 3a.

この状態から結合部材２を手回しで締め付けていくと、フェルール３における第２ノッチ３６前方の先端部分３８がカム面１７に当接し、この状態からさらに結合部材２を締め付けていくと、フェルール３の先端部分３８が配管Ｐ２と差込口１４ａとの間に押し込まれ、配管Ｐ２の仮止め状態となる。 When the coupling member 2 is manually tightened from this state, the front end portion 38 of the ferrule 3 in front of the second notch 36 comes into contact with the cam surface 17, and when the coupling member 2 is further tightened from this state, the ferrule 3 The distal end portion 38 is pushed between the pipe P2 and the insertion port 14a, and the pipe P2 is temporarily fixed.

この後は結合部材２を締め付けるための回転トルクが大きくなる。また、この状態では配管Ｐ２を手で保持することなく工具を使って結合部材２を締め付けることができるようになっている。そこで、工具を使って結合部材２を締め付けると、第１ノッチ３５における外周側の辺を構成する外周側面３５ｃと前面３５ａとが交差するコーナ部との間に形成された第２薄肉部３７に応力集中が発生し、第２薄肉部３７が切断される。このように、第２薄肉部３７が第１薄肉部４に先だって切断されるため、後側部分３Ａの姿勢が大きく崩れる前に後側部分３Ａの前端面（すなわち、後面３５ｂ）を前側部分３Ｂの後端面（すなわち、前面３５ａ）に当接させることができ、両者の組み合わせ姿勢を適切に形成することができる。すなわち、この実施の形態においては、後側部分３Ａの前部に残っている第１ノッチ３５における外周側面３５ｃが前側部分３Ｂの上に乗り上げる状態となって、後側部分３Ａの前端面を構成する第１ノッチ３５における後面３５ｂが前側部分３Ｂの後端面を構成する第１ノッチ３５における前面３５ａに当接する状態となる。これが図３(ｂ)の状態である。 Thereafter, the rotational torque for tightening the coupling member 2 increases. In this state, the coupling member 2 can be tightened with a tool without holding the pipe P2 by hand. Therefore, when the coupling member 2 is tightened using a tool, the second thin portion 37 formed between the outer peripheral side surface 35c constituting the outer peripheral side of the first notch 35 and the corner portion where the front surface 35a intersects is formed. Stress concentration occurs, and the second thin portion 37 is cut. Thus, since the 2nd thin part 37 is cut | disconnected prior to the 1st thin part 4, before the attitude | position of 3 A of rear parts collapse | crumbles greatly, the front end surface (namely, rear surface 35b) of the rear part 3A is made into the front part 3B. Can be brought into contact with the rear end surface (that is, the front surface 35a), and the combined posture of both can be appropriately formed. That is, in this embodiment, the outer peripheral side surface 35c of the first notch 35 remaining in the front portion of the rear portion 3A is in a state of riding on the front portion 3B, thereby constituting the front end surface of the rear portion 3A. Thus, the rear surface 35b of the first notch 35 comes into contact with the front surface 35a of the first notch 35 constituting the rear end surface of the front portion 3B. This is the state of FIG.

このような状態となると、後側部分３Ａは、第１薄肉部４が切れることにより、前側部分３Ｂの後端面の外周側端部を支点として軸心側に傾斜しやすくなる。このため、後エッジ部３ａが配管Ｐ２に食い込みやすくなる。また、後側部分３Ａがこのように傾斜すると、結合部材２を締め付ける回転トルクが、後側部分の前端面(後面３５ｂ)を介して前側部分３Ｂの後端面（前面３５ａ）に伝達され、カム面１７に当接する前側部分３Ｂの後端面（前面３５ａ）を押し上げ、前側部分３Ｂ先端を軸心側に傾斜するように作用する。この結果、前エッジ部３ｂが配管Ｐ２に食い込みやすくなる。 If it will be in such a state, 3 A of rear parts will become easy to incline to an axial center side by using the outer peripheral side edge part of the rear-end surface of the front part 3B as a fulcrum, when the 1st thin part 4 cuts. For this reason, it becomes easy for the rear edge portion 3a to bite into the pipe P2. Further, when the rear portion 3A is inclined in this way, the rotational torque for tightening the coupling member 2 is transmitted to the rear end surface (front surface 35a) of the front portion 3B via the front end surface (rear surface 35b) of the rear portion, and the cam The rear end surface (front surface 35a) of the front portion 3B that is in contact with the surface 17 is pushed up, and the front end of the front portion 3B acts so as to be inclined toward the axial center. As a result, the front edge portion 3b is likely to bite into the pipe P2.

したがって、この状態で結合部材２が締め付けられると、結合部材２を締め付ける回転トルクが前向きの力に変換されて第１薄肉部４を介し後側部分３Ａに伝達されるが、フェルール３の先端がカム面１７に押し付けられる状態である。このため、前エッジ部３ｂがわずかに食い込んだ状態になるとともに、第１薄肉部４に応力集中が発生して第１薄肉部４が切断される。その後は、後側部分３Ａの後端面における外周側端部が押圧面２５により押圧される状態となる。この状態が図３(ｃ)である。これ以降においては、後側部分３Ａが独立のバックフェルールと同様に作用し、前側部分３Ｂが独立のフロントフェルールと同様に作用する。 Accordingly, when the coupling member 2 is tightened in this state, the rotational torque for tightening the coupling member 2 is converted into a forward force and transmitted to the rear portion 3A via the first thin portion 4, but the tip of the ferrule 3 is The cam surface 17 is pressed. For this reason, the front edge portion 3b is slightly bitten, and stress concentration occurs in the first thin portion 4 so that the first thin portion 4 is cut. Thereafter, the outer peripheral side end portion of the rear end surface of the rear portion 3 A is pressed by the pressing surface 25. This state is shown in FIG. Thereafter, the rear portion 3A acts in the same manner as an independent back ferrule, and the front portion 3B acts in the same manner as an independent front ferrule.

さらに、この状態において、押圧面２５は、軸心側が後方となる傾斜面に形成されているので、後側部分３Ａは、後端面の外周側端部が押圧面２５により押圧される。このため、後側部分３Ａの後端部が軸心向き、かつ前向きの力を受ける。この結果、後側部分３Ａは、前側部分３Ｂの後端面の外周側部分を支点として後方を下方とする傾斜状態となって後エッジ部３ａが配管Ｐ２に食い込む。また、後側部分３Ａの前端面（後面３５ｂ）が前側部分３Ｂの後端面（前面３５ａ）に当接しているため、前側部分３Ｂの後端部を押し上げて、前側部分の先端を軸心側に傾斜するように力が作用し、これにより、前エッジ部３ｂが配管Ｐ２に大きく食い込むように作用する。したがって、後エッジ部３ａ及び前エッジ部３ｂの配管Ｐ２への食い込みが大きくなり、シール機能及び配管支持力が向上する。この状態が図３（ｄ）であり、前側部分３Ｂの後端部外周側と軸心との距離ａを後側部分の後端部外周側と軸心との距離ｂより大きくなる程度に傾斜させるように構成することが好ましい。 Further, in this state, since the pressing surface 25 is formed on an inclined surface whose rear side is the axial center side, the outer peripheral side end of the rear end surface of the rear side portion 3A is pressed by the pressing surface 25. For this reason, the rear end portion of the rear portion 3A receives axial and forward force. As a result, the rear portion 3A is in an inclined state in which the rear portion faces downward with the outer peripheral side portion of the rear end surface of the front portion 3B as a fulcrum, and the rear edge portion 3a bites into the pipe P2. Further, since the front end surface (rear surface 35b) of the rear portion 3A is in contact with the rear end surface (front surface 35a) of the front portion 3B, the rear end portion of the front portion 3B is pushed up, and the front end of the front portion is axially moved. As a result, a force acts so as to incline, so that the front edge portion 3b acts to bite into the pipe P2. Therefore, the biting of the rear edge portion 3a and the front edge portion 3b into the pipe P2 is increased, and the sealing function and the pipe support force are improved. This state is FIG. 3D, and the distance a between the outer peripheral side of the rear end portion of the front portion 3B and the shaft center is inclined to be larger than the distance b between the outer peripheral side of the rear end portion of the rear portion and the shaft center. It is preferable to constitute so as to be.

以上のように構成された本実施の形態に係る食い込み式管接続構造は次のような効果を奏する。
（１）フェルール３が分割分離されて、第２薄肉部３７前方の前側部分３Ｂが独立のフロントフェルールと同様に作用し、第２薄肉部３７後方の後側部分３Ａが独立のバックフェルールと同様に作用する。これにより、高いシール性能及び大きな配管支持力を得ることができる。 The bite type pipe connection structure according to the present embodiment configured as described above has the following effects.
(1) The ferrule 3 is divided and separated, the front part 3B in front of the second thin part 37 acts in the same manner as an independent front ferrule, and the rear part 3A behind the second thin part 37 is similar to an independent back ferrule Act on. Thereby, high sealing performance and a large piping support force can be obtained.

（２）上記のような分割型のフェルール３が結合部材２と一体的に製作されるので、部品点数が少なくなり、部品管理工数が削減されるとともに、配管接続工数が削減される。また、従来の食い込み式管接続構造の場合には、部品保管時あるいは配管接続時においてフェルール３を紛失したり、フェルール３を地上などに落としてシール面に傷を付けたりするというおそれがあったが、本実施の形態の場合はこのおそれを解消することができる。 (2) Since the split ferrule 3 as described above is manufactured integrally with the coupling member 2, the number of components is reduced, the number of component management steps is reduced, and the number of pipe connection steps is reduced. Further, in the case of the conventional bite type pipe connection structure, there is a risk that the ferrule 3 may be lost when parts are stored or the pipe is connected, or the ferrule 3 may be dropped on the ground or the like to damage the sealing surface. However, in the case of the present embodiment, this fear can be solved.

（３）フェルール３は、第２薄肉部３７が第１薄肉部４より先に切断されるように形成されているので、後側部分３Ａの姿勢が崩れる前に、後側部分３Ａの前端面（第１ノッチの後面３５ｂ）を前側部分３Ｂの後端面（第１ノッチの前面３５ａ）に当接させることができる。したがって、両者の組み合わせ姿勢を適切に形成することが容易になる。 (3) Since the ferrule 3 is formed so that the second thin portion 37 is cut before the first thin portion 4, the front end surface of the rear portion 3A is broken before the posture of the rear portion 3A is broken. The (rear surface 35b of the first notch) can be brought into contact with the rear end surface (front surface 35a of the first notch) of the front portion 3B. Therefore, it becomes easy to appropriately form a combination posture of both.

（４）押圧面２５が軸心側が後方となる傾斜面に形成されているので、後側部分３Ａの後端部が軸心方向に向いた斜め方向の力で押圧される。これにより、押圧面２５からの力により後側部分３Ａの後端、すなわち後エッジ部３ａが配管Ｐ２に食い込み、配管Ｐ２を支持することができる。 (4) Since the pressing surface 25 is formed on an inclined surface whose rear side is the axial center side, the rear end portion of the rear portion 3A is pressed by an oblique force directed in the axial direction. As a result, the rear end of the rear portion 3A, that is, the rear edge portion 3a, bites into the pipe P2 by the force from the pressing surface 25, and the pipe P2 can be supported.

（５）第１ノッチ３５は軸方向に切断した断面で見て台形を成すとともに、前面３５ａが軸心側が前方となる傾斜面に形成されている。したがって後側部分３Ａが押圧面２５により押圧されることにより、バックフェルールとして作用する後側部分３Ａの前端面（第１ノッチ３５の後面３５ｂ）と、フロントフェルールとして作用する前側部分３Ｂの後端面（第１ノッチ３５の前面３５ａ）が当接して前側部分３Ｂが後側部分３Ａから外周向き、かつ前向きの力を受ける。このとき、前側部分３Ｂの先端部がカム面１７に当接しているため、前エッジ部３ｂが配管Ｐ２に食い込む力を受ける。この結果、後エッジ部３ａ及び前エッジ部３ｂの配管への食い込みが大きくなり、シール機能及び配管支持力が向上する。 (5) The first notch 35 has a trapezoidal shape when viewed in a cross section cut in the axial direction, and the front surface 35a is formed in an inclined surface whose front side is the axial center. Therefore, when the rear portion 3A is pressed by the pressing surface 25, the front end surface (the rear surface 35b of the first notch 35) of the rear portion 3A that functions as a back ferrule and the rear end surface of the front portion 3B that functions as a front ferrule. The (front surface 35a of the first notch 35) abuts and the front portion 3B receives a force directed outward from the rear portion 3A and forward. At this time, since the front end portion of the front portion 3B is in contact with the cam surface 17, the front edge portion 3b receives a force that bites into the pipe P2. As a result, the biting of the rear edge portion 3a and the front edge portion 3b into the pipe is increased, and the sealing function and the pipe support force are improved.

（６）フェルール３は、先端部が先細となるように前方のテーパ面３３と、第１ノッチ３５における前面３５ａと外周側面３５ｃとのコーナ部との間に第２薄肉部３７が形成されているので、第２薄肉部３７を形成するための特別の工程が不要となり、フェルール３の製作工程が簡略化される。また、締付工程において第２薄肉部３７が切断された後、後側部分３Ａの前部に残っている第１ノッチ３５の外周側面３５ｃが前側部分３Ｂの上に乗り上げる状態となって、後側部分３Ａの前端面（第１ノッチ３５における後面３５ｂ）が前側部分３Ｂの後端面（第１ノッチ３５における前面３５ａ）に当接する状態となる。したがって、結合部材２がさらに締め付けられたときに、後側部分３Ａが後方を下方とする傾斜状態となりやすくなる。その結果、前側部分３Ｂの後端面を押し上げるような力が後側部分３Ａから伝達される。一方、前側部分３Ｂの先端部がカム面１７に当接されているので、フロントフェルールとして機能する前側部分３Ｂの先端が軸心側に傾斜しやすくなる。したがって、後エッジ部３ａ及び前エッジ部３ｂの配管Ｐ２への食い込み量を大きくすることができ、シール機能及び配管保持器能を向上させることができる。 (6) The ferrule 3 has a second thin portion 37 formed between the front tapered surface 33 and the corner portion between the front surface 35a and the outer peripheral side surface 35c of the first notch 35 so that the tip portion is tapered. Therefore, a special process for forming the second thin portion 37 is not required, and the manufacturing process of the ferrule 3 is simplified. In addition, after the second thin portion 37 is cut in the tightening process, the outer peripheral side surface 35c of the first notch 35 remaining on the front portion of the rear portion 3A rides on the front portion 3B. The front end surface of the side portion 3A (the rear surface 35b in the first notch 35) comes into contact with the rear end surface of the front portion 3B (the front surface 35a in the first notch 35). Therefore, when the coupling member 2 is further tightened, the rear portion 3A is likely to be in an inclined state with the rear side downward. As a result, a force that pushes up the rear end surface of the front portion 3B is transmitted from the rear portion 3A. On the other hand, since the front end portion of the front portion 3B is in contact with the cam surface 17, the front end of the front portion 3B that functions as a front ferrule tends to be inclined toward the axial center. Therefore, the amount of biting of the rear edge portion 3a and the front edge portion 3b into the pipe P2 can be increased, and the sealing function and the pipe holder performance can be improved.

（７）締め付け開始時の手締め工程において結合部材２を締め付けることにより、第２ノッチ３６前方の先端部分３８が配管Ｐ２と継手本体１との間に押し込まれる。これにより、工具による締め付けを行う前に配管Ｐ２が抜けないように配管Ｐ２を仮固定することができる。 (7) By tightening the coupling member 2 in the manual tightening process at the start of tightening, the front end portion 38 in front of the second notch 36 is pushed between the pipe P 2 and the joint body 1. Accordingly, the pipe P2 can be temporarily fixed so that the pipe P2 does not come out before tightening with a tool.

（８）本実施の形態に係る食い込み式管管接続構造は、上述の記載からも明らかなように、管継手や閉鎖弁等の弁における管接続部に適用することができる。また、上記の食い込み式管管接続構造を管接続部に採用した管継手や弁は、管接続部のシール性能及び配管支持力が大きくなり、流体の漏れが少なくなる。また、配管接続工数や部品管理工数が削減される。また、フェルール紛失のおそれやフェルールの表面を傷つけるおそれを解消することができる。 (8) The bite type pipe-and-tube connection structure according to the present embodiment can be applied to a pipe-connecting portion in a valve such as a pipe joint or a shut-off valve, as is apparent from the above description. Moreover, the pipe joint and valve which employ | adopted the said biting type pipe-and-tube connection structure for a pipe connection part become large in the sealing performance of a pipe connection part, and piping support force, and fluid leakage decreases. In addition, the number of pipe connection man-hours and parts management man-hours are reduced. Moreover, the possibility of losing the ferrule or damaging the surface of the ferrule can be eliminated.

（９）また、このような管継手や弁を冷媒回路に用いた冷凍装置は、冷媒漏れが少なくなり信頼性が向上する。
（実施の形態２）
次に、実施の形態２について図４に基づき説明する。実施の形態２は、実施の形態１において、継手本体１及び結合部材２の螺合部としての雌ねじと雄ねじとを反対にしたものである。なお、これら図において、実施の形態１の構成と同一又は相当する構成には同一の符号を付し、その説明を省略する。 (9) In addition, a refrigeration apparatus using such a pipe joint or valve in a refrigerant circuit reduces refrigerant leakage and improves reliability.
(Embodiment 2)
Next, Embodiment 2 will be described with reference to FIG. The second embodiment is the same as the first embodiment except that the female screw and the male screw as the threaded portions of the joint body 1 and the coupling member 2 are reversed. In these drawings, the same or corresponding components as those in the first embodiment are given the same reference numerals, and the description thereof is omitted.

このために、実施の形態２においては、継手本体１は、図４に示すように、基部１１の前方に形成された軸部１４の外周面に螺合部としての雄ねじ１４ｂを形成しており、実施の形態１のように軸部１４の外周には雌ねじ筒部を形成していない。また、結合部材２は、実施の形態１のような保護筒部がなく、基部２２の継手本体側に雌ねじ筒部２８が形成されている。雌ねじ筒部２８は、内周に継手本体１の雄ねじ１４ｂに螺合する螺合部としての雌ねじ２８ａが形成されている。なお、フェルール３などの他の構成は、実施の形態１と同一である。 For this reason, in the second embodiment, the joint body 1 is formed with a male screw 14b as a threaded portion on the outer peripheral surface of the shaft portion 14 formed in front of the base portion 11, as shown in FIG. As in the first embodiment, the female screw cylinder portion is not formed on the outer periphery of the shaft portion 14. Further, the coupling member 2 does not have the protective cylinder part as in the first embodiment, and the female screw cylinder part 28 is formed on the joint body side of the base part 22. The female screw cylinder portion 28 is formed with a female screw 28a as a screwed portion that is screwed into the male screw 14b of the joint body 1 on the inner periphery. Other configurations such as the ferrule 3 are the same as those in the first embodiment.

実施の形態２は以上のように構成されているので、継手本体１と結合部材２との接続は、図４に示すように、継手本体１の雄ねじ１４ｂが結合部材２の雌ねじ筒部２８内に挿入されるように螺合されて締結される。なお、接続工程におけるフェルール３の変化は実施の形態１の場合と同様である。 Since the second embodiment is configured as described above, the connection between the joint body 1 and the coupling member 2 is performed in such a manner that the male thread 14b of the joint body 1 is within the female thread cylinder portion 28 of the coupling member 2, as shown in FIG. It is screwed and fastened so that it may be inserted in. The change of the ferrule 3 in the connection process is the same as that in the first embodiment.

実施の形態２は、以上のように継手本体１と結合部材２との螺合構造が異なるものにおいても本発明が適用できることを示したものであって、前述の実施の形態１場合と同様の効果を奏することができる。 The second embodiment shows that the present invention can be applied even when the joint body 1 and the coupling member 2 have different screwing structures as described above, and is the same as in the first embodiment. There is an effect.

（変形例）
（１）各実施の形態において、第２薄肉部３７は、図５に示すように、テーパ面３３に切込部３９を形成し、この切込部３９の先端と第１ノッチ３５における前面３５ａと外周側面３５ｃとの間に形成するようにしてもよい。このように構成すれば、結合部材２を締め付ける回転トルクが所定値になったときに第２薄肉部３７が切断されるように、切込部３９により第２薄肉部３７を適宜の肉厚に設定することが容易になる。 (Modification)
(1) In each embodiment, as shown in FIG. 5, the second thin portion 37 forms a cut portion 39 in the tapered surface 33, and the front surface 35 a of the front end of the cut portion 39 and the first notch 35. And the outer peripheral side surface 35c. If comprised in this way, when the rotational torque which clamp | tightens the coupling member 2 becomes a predetermined value, the 2nd thin part 37 is made into appropriate thickness by the notch part 39 so that the 2nd thin part 37 may be cut | disconnected. Easy to set.

（２）各実施の形態において、被接続側機器との接続は、被接続側機器から導出される接続部としての配管Ｐ１をろう付するソケット部１２に形成されているが、これに代えて外周に雄ねじが形成された継手部を備えたものとしてもよい。 (2) In each embodiment, the connection with the connected side device is formed in the socket portion 12 that brazes the pipe P1 as the connecting portion led out 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.

（３）本実施の形態においては、継手本体１と結合部材２との結合構造及び配管接続方式については、本発明の趣旨を逸脱しない範囲で適宜変更してもよい。 (3) 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.

本発明の実施の形態１に係る食い込み式管継手の部分断面図であって、締結開始時の状態を示す。It is a fragmentary sectional view of the bite type pipe joint which concerns on Embodiment 1 of this invention, Comprising: The state at the time of a fastening start is shown. 同食い込み式管継手のフェルール周りの拡大断面図である。It is an expanded sectional view around the ferrule of the same bite type pipe joint. 同食い込み式管継手の締結工程を示すフェルール周りの断面図であって、（ａ）は締結開始時の状態を示し、（ｂ）は第２薄肉部が切断された状態を示し、（ｃ）は第１薄肉部が切断されてフェルールが結合部材から分離された状態を示し、（ｄ）は締結完了の状態を示す。It is sectional drawing around the ferrule which shows the fastening process of the same biting type pipe joint, (a) shows the state at the time of a fastening start, (b) shows the state by which the 2nd thin part was cut | disconnected, (c) Indicates a state where the first thin portion is cut and the ferrule is separated from the coupling member, and (d) indicates a state where the fastening is completed. 本発明の実施の形態２に係る食い込み式管継手の部分断面図であって、締結開始時の状態を示す。It is a fragmentary sectional view of the bite type pipe joint which concerns on Embodiment 2 of this invention, Comprising: The state at the time of a fastening start is shown. 第２薄肉部周りの変形例に係る部分断面図である。It is a fragmentary sectional view concerning the modification around the 2nd thin part.

Explanation of symbols

Ｐ２…配管、１…継手本体、２…結合部材、３…フェルール、３ａ…後エッジ部、３Ａ…後側部分、３ｂ…前エッジ部、３Ｂ…前側部分、４…第１薄肉部、１７…カム面、２５…押圧面、３１…配管貫通孔、３２…空間部、３３…テーパ面、３５…第１ノッチ、３５ａ…前面、３５ｃ…外周側面、３６…第２ノッチ、３７…第２薄肉部、３８…先端部分、３９…切込部。 P2 ... pipe, 1 ... joint body, 2 ... coupling member, 3 ... ferrule, 3a ... rear edge part, 3A ... rear side part, 3b ... front edge part, 3B ... front side part, 4 ... first thin part, 17 ... Cam surface 25 ... Pressing surface 31 ... Pipe through hole 32 ... Space portion 33 ... Tapered surface 35 ... First notch 35a ... Front surface 35c ... Outer peripheral side surface 36 ... Second notch 37 ... Second thin wall Part 38 ... tip part 39 ... notch part.

Claims

The joint body having a cam surface to which the tip of the ferrule is pressed, a coupling member having a pressing surface to press the ferrule, and the coupling member are screwed to the joint body, whereby the tip is pressed against the cam surface. A bite type pipe connection structure with a ferrule,
The ferrule is connected to the coupling member via a first thin portion having a surface shape in a substantially radial direction at a position where a space portion of a predetermined distance is interposed in the axial direction with the pressing surface, and the coupling member is tightened. In the process, the first thin part is formed to be cut,
Further, the ferrule is formed with a first notch in the intermediate portion in the axial direction, thereby forming a second thin portion between the first notch and the outer peripheral surface of the ferrule. The front portion of the front of the second thin portion functions as a front ferrule in the step after the first thin portion and the second thin portion are cut, and the rear of the second thin portion is rearward. A bite type pipe connection structure characterized in that the side portion is configured to function as a back ferrule.

The bite type pipe connection structure according to claim 1, wherein the ferrule is formed such that the second thin portion is cut before the first thin portion.

The pressing surface is formed on an inclined surface whose rear side is the axial center side,
The first notch has, in a cross section cut in the axial direction, an axial side parallel to the axial center and an outer peripheral side parallel to the axial center, and the former has a substantially trapezoidal shape larger than the latter. Formed to
The front surface of the first notch is formed in an inclined surface whose front side is the axial center side,
The ferrule has a front edge portion that bites into the pipe so as to seal between the outer peripheral surface of the pipe and the ferrule at the front end portion, and a rear edge portion that bites into the pipe so as to support the pipe at the rear end portion. The bite type pipe connection structure according to claim 2, wherein the bite type pipe connection structure is formed.

In the ferrule, a front outer peripheral surface is formed in a tapered surface so that a tip end portion is tapered, and a second thin wall is formed between the tapered surface and a corner portion where the outer peripheral side surface and the front surface of the first notch intersect. 4. The bite type pipe connection structure according to claim 3, wherein a portion is formed.

In the ferrule, an outer peripheral surface of the front portion is formed into a tapered surface so that a tip portion is tapered, and a notch is formed in the tapered surface. The tip of the notch and the first notch The bite type pipe connection structure according to claim 3, wherein a second thin portion is formed between the front surface and the front surface.

In the ferrule, a second notch is formed at the tip, and a corner between the rear surface of the second notch and the inner peripheral surface of the pipe through-hole is formed at the front edge, and further in front of the second notch. The tip portion is configured to be pushed between the pipe and the joint body in a wedge shape in the hand tightening step before the second thin portion is cut in the tightening step. The bite type pipe connection structure according to any one of 5.

The valve which used the bite type pipe connection structure of any one of Claims 1-6 for the pipe connection part.

The bite type pipe joint which uses the bite type 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 bite type pipe joint according to claim 8 in a refrigerant circuit.