JP5012455B2

JP5012455B2 - Piping joint assembly and manufacturing method thereof

Info

Publication number: JP5012455B2
Application number: JP2007306446A
Authority: JP
Inventors: 則昌馬場
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2007-11-27
Filing date: 2007-11-27
Publication date: 2012-08-29
Anticipated expiration: 2027-11-27
Also published as: JP2009127988A

Description

本発明は、配管に径外方への円環状突出部を形成し、この円環状突出部を接続フランジ部材の拡大凹部に圧入固定する配管継手組立体、およびその製造方法に関するものであり、例えば、車両空調用冷凍サイクルの冷媒配管継手に用いて好適なものである。 The present invention relates to a pipe joint assembly in which an annular projecting portion radially outward is formed in a pipe, and the annular projecting part is press-fitted and fixed to an enlarged recess of a connection flange member, and a manufacturing method thereof, for example, It is suitable for use in a refrigerant pipe joint of a refrigeration cycle for vehicle air conditioning.

従来、この種の配管継手組立体として、例えば、特許文献１に示すものが知られている。すなわち、接続フランジ部材に貫通された貫通孔の一端面に設けられた拡大凹部に、配管の円環状突出部が圧入固定されるとともに、その貫通孔の他端面に設けられた第２の拡大凹部に別材の固定部材が圧入固定されて、接続フランジ部材に複数の配管が保持固定されている。 Conventionally, what is shown, for example in patent document 1 is known as this kind of piping joint assembly. That is, the annular projecting portion of the pipe is press-fitted and fixed to the enlarged concave portion provided on one end surface of the through hole penetrating the connection flange member, and the second enlarged concave portion provided on the other end surface of the through hole. A separate fixing member is press-fitted and fixed, and a plurality of pipes are held and fixed to the connection flange member.

これにより、それぞれの配管が接続フランジ部材の両端面側の２ヶ所で保持固定されているため、配管に振動等による振れが生じにくく、接続フランジ部材からの配管の抜けを防止している。
特開２００５−５５１４８号公報 Thereby, since each piping is hold | maintained and fixed at two places of the both end surface side of a connection flange member, the vibration by vibration etc. does not arise easily in piping, and the disconnection of the piping from a connection flange member is prevented.
JP 2005-55148 A

図１０は、従来技術における配管継手組立体の課題を示す断面図である。図１０に示すように、複数の配管の両端を接続フランジ部材に保持固定させようとすると、各配管長さにばらつきが生じて、一方の配管１００が他方の配管１１０よりも長い（Ｌ１＜Ｌ２）場合には、一方の配管１００の円環状突出部１２０を接続フランジ部材１３０の拡大凹部１４０に圧入固定させることができないという問題がある。 FIG. 10 is a cross-sectional view showing a problem of the pipe joint assembly in the prior art. As shown in FIG. 10, when both ends of a plurality of pipes are held and fixed to the connection flange member, the lengths of the pipes vary, and one pipe 100 is longer than the other pipe 110 (L1 <L2 ) There is a problem that the annular projecting portion 120 of one pipe 100 cannot be press-fitted and fixed in the enlarged concave portion 140 of the connection flange member 130.

また、ばらつきを有した状態で配管１００を接続フランジ部材１３０に圧入固定させると、組付け後の配管組立体においても、配管長さの寸法精度が確保できないという問題がある。 In addition, when the pipe 100 is press-fitted and fixed to the connection flange member 130 with variations, there is a problem that the dimensional accuracy of the pipe length cannot be secured even in the pipe assembly after assembly.

そこで、本発明の目的は、組み立て後の寸法精度の向上が図れる配管継手組立体およびその製造方法を提供することにある。 Therefore, an object of the present invention is to provide a pipe joint assembly that can improve the dimensional accuracy after assembly and a method for manufacturing the same.

上記目的を達成するために、以下の技術的手段を採用する。すなわち、請求項１に記載の発明では、直管部と、この直管部の一端側に形成されて径外方に突出する第１の円環状突出部（１６）と、直管部の他端側に形成されて径外方に突出する第２の円環状突出部（１６）とを有する第１の配管（１１）と、直管部と、この直管部の一端側に形成されて径外方に突出する第１の円環状突出部（１７）と、直管部の他端側に形成されて径外方に突出する第２の円環状突出部（１７）とを有する第２の配管（１２）と、第１および第２の配管（１１、１２）の直管部がそれぞれ挿入される貫通孔（１３ａ、１４ａ）を有し、第１および第２の配管（１１、１２）の第１の円環状突出部（１６、１７）が外側端面に固定される第１の接続フランジ部材（１０ｂ、１０ｃ）と、第１および第２の配管（１１、１２）の直管部がそれぞれ挿入される貫通孔（１３ａ、１４ａ）を有し、第１および第２の配管（１１、１２）の第２の円環状突出部（１６、１７）が外側端面に固定される第２の接続フランジ部材（１０ａ）とを備える配管継手組立体において、
第２の円環状突出部（１６、１７）が固定される第２の接続フランジ部材（１０ａ）の外側端面に、貫通孔（１３ａ、１４ａ）の内径より大きくかつ第２の円環状突出部（１６、１７）の外径よりも大きな拡大凹部（１３ｂ、１４ｂ）が形成されており、第２の円環状突出部（１６、１７）が拡大凹部（１３ｂ、１４ｂ）に圧入固定されており、第１および第２の配管（１１、１２）の少なくとも一方であって、所定の配管長さ（Ｌ０）を超えている配管において、かつ第１の円環状突出部（１６、１７）とは反対側となる第１の接続フランジ部材（１０ｂ、１０ｃ）の内側において、第１の接続フランジ部材（１０ｂ、１０ｃ）の端面に近接して、配管の外径を拡張する膨らみ部（１８、１９）が形成されており、膨らみ部が形成されることにより、配管の配管長さを短くし、組み合わされた一対の第１および第２の配管（１１、１２）を所定の同一長さ（Ｌ０）となるように、かつ、膨らみ部（１８、１９）と第１の円環状突出部（１６、１７）との間に第１の接続フランジ部材（１０ｂ、１０ｃ）を挟み第１の接続フランジ部材（１０ｂ、１０ｃ）と第１および第２の配管（１１、１２）とを強固に固定するように組み立てられていることを特徴としている。 In order to achieve the above object, the following technical means are adopted. That is, in the first aspect of the invention, the straight pipe portion, the first annular projecting portion (16) formed on one end side of the straight pipe portion and projecting radially outward, and the straight pipe portion A first pipe (11) having a second annular protrusion (16) formed on the end side and projecting radially outward, a straight pipe part, and formed on one end side of the straight pipe part A second annular projecting portion (17) projecting radially outward and a second annular projecting portion (17) formed on the other end side of the straight pipe portion and projecting radially outward. Pipe (12) and through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are respectively inserted, and the first and second pipes (11, 12). ) First annular flanges (16, 17) fixed to the outer end surface, and first and second pipes (11, 1). ) Through-holes (13a, 14a) into which the straight pipe portions are respectively inserted, and the second annular protrusions (16, 17) of the first and second pipes (11, 12) are formed on the outer end faces. In a pipe joint assembly comprising a second connection flange member (10a) to be fixed,
On the outer end surface of the second connection flange member (10a) to which the second annular protrusion (16, 17) is fixed, a second annular protrusion (2) larger than the inner diameter of the through hole (13a, 14a) is formed. 16 and 17) are formed with enlarged recesses (13b and 14b) larger than the outer diameter, and the second annular protrusions (16 and 17) are press-fitted and fixed to the enlarged recesses (13b and 14b). At least one of the first and second pipes (11, 12) that is longer than the predetermined pipe length (L0 ) and opposite to the first annular protrusion (16, 17) On the inner side of the first connection flange member (10b, 10c) on the side, the bulge portion (18, 19) that extends near the end face of the first connection flange member (10b, 10c) and expands the outer diameter of the pipe There is formed, this bulging portion is formed Thus, the pipe length of the pipe is shortened, and the pair of first and second pipes (11, 12) combined to have a predetermined same length (L0) and the bulge portions (18, 19). ) And the first annular protrusion (16, 17), the first connection flange member (10b, 10c) is sandwiched between the first connection flange member (10b, 10c) and the first and second pipes. (11, 12) are assembled so as to be firmly fixed .

この発明によれば、膨らみ部（１８、１９）が形成されることにより、第１および第２の配管（１１、１２）の軸方向の長さのばらつきを補正することができる。従って、組み立て後の寸法精度の向上が図れる。 According to this invention, the variation in the axial length of the first and second pipes (11, 12) can be corrected by forming the bulges (18, 19). Therefore, the dimensional accuracy after assembly can be improved.

請求項２に記載の発明では、第１の円環状突出部（１６、１７）が固定される第１の接続フランジ部材（１０ｂ）の外側端面に、貫通孔（１３ａ、１４ａ）の内径より大きくかつ第１の円環状突出部（１６、１７）の外径よりも大きな拡大凹部（１３ｂ、１４ｂ）が形成されており、第１の円環状突出部（１６、１７）が拡大凹部（１３ｂ、１４ｂ）に圧入固定されていることを特徴としている。この発明によれば、第１および第２の配管（１１、１２）の両端側が第１および第２の接続フランジ部材（１０ａ、１０ｂ）により圧入固定されていることにより、第１および第２の配管（１１、１２）を接続フランジ部材（１０ａ、１０ｂ）に強固に圧入固定することができる。 In the invention according to claim 2, the outer end face of the first connection flange member (10b) to which the first annular protrusion (16, 17) is fixed is larger than the inner diameter of the through hole (13a, 14a). And the enlarged recessed part (13b, 14b) larger than the outer diameter of the 1st annular protrusion (16, 17) is formed, and the 1st annular protrusion (16, 17) is an enlarged recessed part (13b, 14b) is press-fitted and fixed. According to the present invention, both end sides of the first and second pipes (11, 12) are press-fitted and fixed by the first and second connection flange members (10a, 10b), so that the first and second pipes are fixed. The pipes (11, 12) can be firmly press-fitted and fixed to the connection flange members (10a, 10b).

請求項３に記載の発明では、第１の円環状突出部（１６、１７）が固定される第１の接続フランジ部材（１０ｃ）の外側端面は、第１の円環状突出部（１６、１７）が嵌合される凹部のない平板から形成されていることを特徴としている。この発明によれば、第１の円環状突出部（１６、１７）の反対側に膨らみ部（１８、１９）を形成することができる。これにより、膨らみ部（１８、１９）に近接して配設される第１の接続フランジ部材（１０ｃ）は、薄型の板材により簡素な形状に形成することができる。 In the invention according to claim 3, the outer end face of the first connection flange member (10c) to which the first annular protrusion (16, 17) is fixed is formed on the first annular protrusion (16, 17). ) Is formed from a flat plate without a recess to be fitted. According to the present invention, the bulging portion (18, 19) can be formed on the opposite side of the first annular protrusion (16, 17). Thereby, the 1st connection flange member (10c) arrange | positioned adjacent to the bulging part (18, 19) can be formed in a simple shape with a thin board | plate material.

請求項４に記載の発明では、膨らみ部（１８、１９）は、径外方に突出する円環状の突出部として形成されていることを特徴としている。この発明によれば、別体の固定部材を設けることなく、第１および第２の接続フランジ部材（１０ａ、１０ｂ）と第１および第２の配管（１１、１２）との固定強度を増加することができる。これにより、第１および第２の接続フランジ部材（１０ａ、１０ｂ）からの配管の抜けを防止することができる。 The invention according to claim 4 is characterized in that the bulging portions (18, 19) are formed as annular projecting portions projecting radially outward. According to this invention, the fixing strength between the first and second connecting flange members (10a, 10b) and the first and second pipes (11, 12) is increased without providing separate fixing members. be able to. Thereby, the disconnection of the piping from the first and second connection flange members (10a, 10b) can be prevented.

請求項５に記載の発明では、第１の接続フランジ部材（１０ｂ、１０ｃ）および第２の接続フランジ部材（１０ａ）には、貫通孔（１３ａ、１４ａ）を、接続フランジ部材（１０ａ、１０ｂ、１０ｃ）の短辺方向（Ｂ）に開口する開口部（１３ｃ、１４ｃ）が形成されていることを特徴としている。この発明によれば、第１および第２の配管（１１、１２）を貫通孔（１３ａ、１４ａ）に容易に挿入することができる。 In the invention according to claim 5, the first connection flange member (10b, 10c) and the second connection flange member (10a) are provided with through holes (13a, 14a), connection flange members (10a, 10b, 10c) is formed with openings (13c, 14c) that open in the short-side direction (B). According to this invention, the first and second pipes (11, 12) can be easily inserted into the through holes (13a, 14a).

請求項６に記載の発明では、直管部と、この直管部の一端側に形成されて径外方に突出する第１の円環状突出部（１６）と、直管部の他端側に形成されて径外方に突出する第２の円環状突出部（１６）とを有する第１の配管（１１）と、直管部と、この直管部の一端側に形成されて径外方に突出する第１の円環状突出部（１７）と、直管部の他端側に形成されて径外方に突出する第２の円環状突出部（１７）とを有する第２の配管（１２）と、第１および第２の配管（１１、１２）の直管部がそれぞれ挿入される貫通孔（１３ａ、１４ａ）を有し、第１および第２の配管（１１、１２）の第１の円環状突出部（１６、１７）が外側端面に固定される第１の接続フランジ部材（１０ｂ）と、第１および第２の配管（１１、１２）の直管部がそれぞれ挿入される貫通孔（１３ａ、１４ａ）を有し、第１および第２の配管（１１、１２）の第２の円環状突出部（１６、１７）が外側端面に固定される第２の接続フランジ部材（１０ａ）とを備える配管継手組立体の製造方法において、
第１および第２の接続フランジ部材（１０ａ、１０ｂ）に、貫通孔（１３ａ、１４ａ）を形成する工程と、第１の接続フランジ部材（１０ｂ）の外側端面に、貫通孔（１３ａ、１４ａ）の内径より大きくかつ第１の円環状突出部（１６、１７）の外径よりも大きな拡大凹部（１３ｂ、１４ｂ）を形成する工程と、第２の接続フランジ部材（１０ａ）の外側端面に、貫通孔（１３ａ、１４ａ）の内径より大きくかつ第２の円環状突出部（１６、１７）の外径よりも大きな拡大凹部（１３ｂ、１４ｂ）を形成する工程と、第１の円環状突出部（１６、１７）を、第１の接続フランジ部材（１０ｂ）に形成した拡大凹部（１３ｂ、１４ｂ）に圧入固定する工程と、第１および第２の配管（１１、１２）の少なくとも一方であって、所定の配管長さ（Ｌ０）を超えている配管において、かつ第１の円環状突出部（１６、１７）とは反対側となる第１の接続フランジ部材（１０ｂ）の内側において、第１の接続フランジ部材（１０ｂ、１０ｃ）の端面に近接して、配管の外径を拡張する膨らみ部（１８、１９）を形成し、膨らみ部（１８、１９）の形成により配管の配管長さを短くし、組み合わされた一対の第１および第２の配管（１１、１２）を所定の同一長さ（Ｌ０）となるように調節し、かつ、膨らみ部（１８、１９）と第１の円環状突出部（１６、１７）との間に第１の接続フランジ部材（１０ｂ、１０ｃ）を挟み第１の接続フランジ部材（１０ｂ、１０ｃ）と第１および第２の配管（１１、１２）とを強固に固定するように組み立てる工程と、第２の円環状突出部（１６、１７）を、第２の接続フランジ部材（１０ａ）に形成した拡大凹部（１３ｂ、１４ｂ）に圧入固定する工程とを有することを特徴としている。 In the invention described in claim 6, the straight pipe portion, the first annular projecting portion (16) formed on one end side of the straight pipe portion and projecting radially outward, and the other end side of the straight pipe portion A first pipe (11) having a second annular projecting portion (16) that is formed on the outer diameter and projecting radially outward, a straight pipe section, and formed on one end side of the straight pipe section. A second pipe having a first annular projecting portion (17) projecting outward and a second annular projecting portion (17) formed on the other end side of the straight tube portion and projecting radially outward. (12) and through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are respectively inserted, and the first and second pipes (11, 12) The first annular flange (16, 17) is fixed to the outer end face, the first connection flange member (10b), and the straight pipe portions of the first and second pipes (11, 12) Second through-holes (13a, 14a) to be inserted and second annular protrusions (16, 17) of the first and second pipes (11, 12) fixed to the outer end surfaces. In a manufacturing method of a pipe joint assembly provided with a connection flange member (10a),
A step of forming through holes (13a, 14a) in the first and second connection flange members (10a, 10b), and a through hole (13a, 14a) in the outer end surface of the first connection flange member (10b). Forming an enlarged recess (13b, 14b) larger than the inner diameter of the first annular protrusion (16, 17) and on the outer end face of the second connection flange member (10a), Forming an enlarged recess (13b, 14b) larger than the inner diameter of the through holes (13a, 14a) and larger than the outer diameter of the second annular protrusion (16, 17), and the first annular protrusion the (16, 17), a step of press-fitted in the enlarged recess formed in the first connecting flange member (10b) (13b, 14b), at least one of the first and second pipe (11, 12) meet Specified pipe length ( 0) in it are pipeline exceeded, and the first annular protrusion (16, 17) inside the first connecting flange member on the opposite side (10b), the first connecting flange member (10b, 10c) in the vicinity of the end face, bulge portions (18, 19) for expanding the outer diameter of the pipe are formed, and by forming the bulge portions (18, 19), the pipe length of the pipe is shortened, and the combined pair The first and second pipes (11, 12) are adjusted to have a predetermined length (L0) , and the bulges (18, 19) and the first annular protrusions (16, 17) are adjusted. The first connection flange member (10b, 10c) is sandwiched between the first connection flange member (10b, 10c) and the first and second pipes (11, 12) to be firmly fixed. and assembly Ru step, the second annular protrusion portion (16, 17) Is characterized by a step of press-fitted in the enlarged recess formed in the second connecting flange (10a) (13b, 14b).

この発明によれば、膨らみ部（１８、１９）を形成する工程を有することにより、配管長さのばらつきを補正することができる。従って、組み立て後の寸法精度の向上が図れる。また、第１および第２の配管（１１、１２）を、第１および第２の接続フランジ部材（１０ａ、１０ｂ）に容易に圧入固定することができる。更に、第１および第２の接続フランジ部材（１０ａ、１０ｂ）と第１および第２の配管（１１、１２）との接合強度を増加することができる。 According to the present invention, it is possible to correct the variation in the pipe length by including the step of forming the bulging portions (18, 19). Therefore, the dimensional accuracy after assembly can be improved. Also, the first and second pipes (11, 12) can be easily press-fitted and fixed to the first and second connection flange members (10a, 10b). Furthermore, the joint strength between the first and second connection flange members (10a, 10b) and the first and second pipes (11, 12) can be increased.

請求項７の発明では、直管部と、この直管部の一端側に形成されて径外方に突出する第１の円環状突出部（１６）と、直管部の他端側に形成されて径外方に突出する第２の円環状突出部（１６）とを有する第１の配管（１１）と、直管部と、この直管部の一端側に形成されて径外方に突出する第１の円環状突出部（１７）と、直管部の他端側に形成されて径外方に突出する第２の円環状突出部（１７）とを有する第２の配管（１２）と、第１および第２の配管（１１、１２）の直管部がそれぞれ挿入される貫通孔（１３ａ、１４ａ）を有し、第１および第２の配管（１１、１２）の第１の円環状突出部（１６、１７）が外側端面に固定される第１の接続フランジ部材（１０ｃ）と、第１および第２の配管（１１、１２）の直管部がそれぞれ挿入される貫通孔（１３ａ、１４ａ）を有し、第１および第２の配管（１１、１２）の第２の円環状突出部（１６、１７）が外側端面に固定される第２の接続フランジ部材（１０ａ）とを備える配管継手組立体の製造方法において、
第１および第２の接続フランジ部材（１０ａ、１０ｃ）に、貫通孔（１３ａ、１４ａ）を形成する工程と、第２の接続フランジ部材（１０ａ）の外側端面に、貫通孔（１３ａ、１４ａ）の内径より大きくかつ第２の円環状突出部（１６、１７）の外径よりも大きな拡大凹部（１３ｂ、１４ｂ）を形成する工程と、所定の配管長さ（Ｌ０）を超えている第１および第２の配管（１１、１２）において、かつ第１の円環状突出部（１６、１７）とは反対側となる第１の接続フランジ部材（１０ｃ）の内側において、第１の接続フランジ部材（１０ｃ）の端面に近接して、配管の外径を拡張する膨らみ部（１８、１９）をそれぞれ形成し、膨らみ部（１８、１９）の形成により第１および第２の配管（１１、１２）を第１の接続フランジ部材（１０ｃ）に固定するとともに、第１および第２の配管（１１、１２）の配管長さを短くし、組み合わされた一対の第１および第２の配管（１１、１２）を所定の同一長さ（Ｌ０）となるように軸方向の長さを調節し、かつ、膨らみ部（１８、１９）と第１の円環状突出部（１６、１７）との間に第１の接続フランジ部材（１０ｂ、１０ｃ）を挟み第１の接続フランジ部材（１０ｂ、１０ｃ）と第１および第２の配管（１１、１２）とを強固に固定するように組み立てる工程と、第２の円環状突出部（１６、１７）を、第２の接続フランジ部材（１０ａ）に形成した拡大凹部（１３ｂ、１４ｂ）に圧入固定する工程とを有することを特徴としている。 In the invention of claim 7, the straight pipe portion, the first annular projecting portion (16) formed on one end side of the straight pipe portion and projecting radially outward, and formed on the other end side of the straight pipe portion. A first pipe (11) having a second annular projecting portion (16) projecting radially outward, a straight pipe portion, and formed on one end side of the straight pipe portion and radially outward. A second pipe (12) having a first annular projecting portion (17) projecting and a second annular projecting portion (17) formed on the other end side of the straight pipe portion and projecting radially outward. ) And through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are inserted, respectively, and the first of the first and second pipes (11, 12) The first projecting flange member (10c) to which the annular projections (16, 17) are fixed to the outer end face and the straight pipe portions of the first and second pipes (11, 12) are respectively inserted. Second connection flanges having second through-holes (16, 17) of the first and second pipes (11, 12) fixed to the outer end surfaces. In a manufacturing method of a pipe joint assembly provided with a member (10a),
A step of forming through holes (13a, 14a) in the first and second connection flange members (10a, 10c), and a through hole (13a, 14a) in the outer end surface of the second connection flange member (10a). Forming an enlarged recess (13b, 14b) larger than the inner diameter of the second annular protrusion (16, 17) and larger than the outer diameter of the second annular protrusion (16, 17), and the first exceeding the predetermined pipe length (L0) In the second pipe (11, 12) and on the inner side of the first connection flange member (10c) opposite to the first annular protrusion (16, 17), the first connection flange member Protruding portions (18, 19) for expanding the outer diameter of the pipe are formed in proximity to the end face of (10c), and the first and second pipes (11, 12) are formed by forming the bulging portions (18, 19). ) The first connecting flange member (10 It is fixed to) the pipe lengths of the first and second pipe (11, 12) and short, combined pair of first and second pipe (11, 12) the same predetermined length ( L0) and the first connecting flange member (10b, 10b,) between the bulges (18, 19) and the first annular protrusions (16, 17). the first connecting flange member (10b, 10c) and the assembly Ru steps as firmly to fix the first and second pipe (11, 12), a second annular protrusion (16 sandwiched 10c) , 17) is press-fitted and fixed in the enlarged recesses (13b, 14b) formed in the second connection flange member (10a).

この発明によれば、膨らみ部（１８、１９）を形成する工程を有することにより、配管長さのばらつきを補正することができる。従って、組み立て後の寸法精度の向上が図れる。また、膨らみ部（１８、１９）に近接して配設される第１の接続フランジ部材（１０ｃ）は、第２の接続フランジ部材（１０ａ）よりも薄型の板材により簡素な形状に形成することができる。 According to the present invention, it is possible to correct the variation in the pipe length by including the step of forming the bulging portions (18, 19). Therefore, the dimensional accuracy after assembly can be improved. Further, the first connection flange member (10c) disposed in the vicinity of the bulge portions (18, 19) should be formed in a simple shape with a plate material thinner than the second connection flange member (10a). Can do.

なお、上記各手段の括弧内の符号は、後述する実施形態の具体的手段との対応関係を示すものである。 In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

（第１実施形態）
以下、本発明の第１実施形態による配管継手組立体およびその製造方法を、図１ないし図４に基づいて説明する。図１は、本発明を車両空調用冷凍サイクルの冷媒配管に適用したもので、配管継手組立体の全体構成を示す断面図である。図２は、第１および第２の接続フランジ部材１０ａ、１０ｂの全体構成を示す平面図である。図３は、膨らみ部１８、１９を形成する前における冷媒配管１１、１２の構成を示す断面図である。 (First embodiment)
Hereinafter, a pipe joint assembly and a manufacturing method thereof according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the overall configuration of a pipe joint assembly, in which the present invention is applied to a refrigerant pipe of a refrigeration cycle for vehicle air conditioning. FIG. 2 is a plan view showing the overall configuration of the first and second connection flange members 10a and 10b. FIG. 3 is a cross-sectional view showing the configuration of the refrigerant pipes 11 and 12 before the bulging portions 18 and 19 are formed.

第１および第２の接続フランジ部材１０ａ、１０ｂは、図１に示すように、２本の冷媒配管１１、１２を保持固定する部材の役割を果たすものであり、その全体形状は、図２に示すように、略矩形の平板形状になっている。本実施形態では、２本の冷媒配管１１、１２の両端に、第１および第２の接続フランジ部材１０ａ、１０ｂが配設されている。ここで、本実施形態では、下方に配置される接続フランジ部材１０ｂを第１の接続フランジ部材１０ｂと称し、上方に配置される接続フランジ部材１０ａを第２の接続フランジ部材１０ａと称している。 As shown in FIG. 1, the first and second connection flange members 10a and 10b serve as members for holding and fixing the two refrigerant pipes 11 and 12, and the overall shape thereof is shown in FIG. As shown, it has a substantially rectangular flat plate shape. In this embodiment, the 1st and 2nd connection flange members 10a and 10b are arrange | positioned at the both ends of the two refrigerant | coolant piping 11 and 12. As shown in FIG. Here, in the present embodiment, the connection flange member 10b disposed below is referred to as a first connection flange member 10b, and the connection flange member 10a disposed above is referred to as a second connection flange member 10a.

２本の冷媒配管１１、１２のうち、一方の大径ｄ１の冷媒配管１１は、冷凍サイクルの低圧側冷媒配管であり、より具体的には、圧縮機吸入側冷媒配管である。他方の小径ｄ２の冷媒配管１２は、冷凍サイクルの高圧側冷媒配管であり、より具体的には、膨張弁入口側に位置する高圧側冷媒配管である。ここで、２本の冷媒配管１１、１２を、請求項では、第１および第２の配管１１、１２と称している。 Of the two refrigerant pipes 11 and 12, one large-diameter d1 refrigerant pipe 11 is a low-pressure side refrigerant pipe of the refrigeration cycle, and more specifically is a compressor suction-side refrigerant pipe. The other small-diameter d2 refrigerant pipe 12 is a high-pressure side refrigerant pipe of the refrigeration cycle, and more specifically, is a high-pressure side refrigerant pipe positioned on the expansion valve inlet side. Here, the two refrigerant pipes 11 and 12 are referred to as first and second pipes 11 and 12 in the claims.

そして、低圧側（吸入側）冷媒配管１１の一端側は、図示しない膨張弁（減圧手段）の低圧側冷媒出口部に接続され、高圧側冷媒配管１２の一端側は、膨張弁の高圧側冷媒入口部に接続される。言い換えると、２本の冷媒配管１１、１２の一端側は、膨張弁に接続される。また、２本の冷媒配管１１、１２の他端側は、図示しない配管コネクタ（配管接続部材）に接続される。 One end of the low-pressure side (suction side) refrigerant pipe 11 is connected to a low-pressure side refrigerant outlet of an expansion valve (decompression unit) (not shown), and one end side of the high-pressure side refrigerant pipe 12 is a high-pressure side refrigerant of the expansion valve. Connected to the inlet. In other words, one end side of the two refrigerant pipes 11 and 12 is connected to the expansion valve. The other end sides of the two refrigerant pipes 11 and 12 are connected to a pipe connector (pipe connection member) (not shown).

つまり、低圧側冷媒配管１１の他端側は、前記配管コネクタを介して、図示しない圧縮機の吸入側に接続される低圧側冷媒配管の上流端に接続される。さらに、高圧側冷媒配管１２の他端側は、前記配管コネクタを介して、図示しない受液器に接続される高圧側冷媒配管の下流端に接続される。なお、それぞれの冷媒配管１１、１２の一端側と他端側は、同一の形状に形成されている。 That is, the other end side of the low pressure side refrigerant pipe 11 is connected to the upstream end of the low pressure side refrigerant pipe connected to the suction side of the compressor (not shown) via the pipe connector. Furthermore, the other end side of the high-pressure side refrigerant pipe 12 is connected to a downstream end of a high-pressure side refrigerant pipe connected to a liquid receiver (not shown) via the pipe connector. In addition, the one end side and other end side of each refrigerant | coolant piping 11 and 12 are formed in the same shape.

また、冷媒配管１１、１２の一端側の直管部に第２の接続フランジ部材１０ａが配置され、他端側の直管部に第１の接続フランジ部材１０ｂが配置されている。そして、両端に配設される第１および第２の接続フランジ部材１０ａ、１０ｂは、同一の形状に形成（ただし、後述する拡大凹部１３ｂ、１４ｂは、反対側の面に形成）されている。 Moreover, the 2nd connection flange member 10a is arrange | positioned at the straight pipe part of the refrigerant pipes 11 and 12 at the one end side, and the 1st connection flange member 10b is arrange | positioned at the straight pipe part of the other end side. The first and second connection flange members 10a and 10b disposed at both ends are formed in the same shape (however, enlarged recesses 13b and 14b described later are formed on opposite surfaces).

第１および第２の接続フランジ部材１０ａ、１０ｂには、図２に示すように、その板厚方向に貫通する二つの貫通孔１３ａ、１４ａが形成されている。この二つの貫通孔１３ａ、１４ａは、それぞれ冷媒配管１１、１２を挿入するためのものであり、一方の貫通孔１３ａは、第１および第２の接続フランジ部材１０ａ、１０ｂの長辺方向の一端側に位置し、他方の貫通孔１４ａは、第１および第２の接続フランジ部材１０ａ、１０ｂの長辺方向の他端側に位置している。 As shown in FIG. 2, the first and second connection flange members 10a and 10b are formed with two through holes 13a and 14a penetrating in the plate thickness direction. The two through holes 13a and 14a are for inserting the refrigerant pipes 11 and 12, respectively. One through hole 13a is one end of the first and second connection flange members 10a and 10b in the long side direction. The other through hole 14a is located on the other end side in the long side direction of the first and second connection flange members 10a and 10b.

また、二つの貫通孔１３ａ、１４ａの中間部位にボルト通し穴１５が２個開けてある。このボルト通し穴１５に挿入されるボルト（図示せず）によって、第２の接続フランジ部材１０ａは、上述したように膨張弁のハウジング部（図示せず）に締結して固定されるようになっている。また、第１の接続フランジ部材１０ｂは、図示しない配管コネクタ（配管接続部材）に接続されるようになっている。 Further, two bolt through holes 15 are formed at an intermediate portion between the two through holes 13a and 14a. By the bolt (not shown) inserted into the bolt through hole 15, the second connection flange member 10a is fastened and fixed to the housing portion (not shown) of the expansion valve as described above. ing. The first connection flange member 10b is connected to a pipe connector (pipe connection member) (not shown).

二つの貫通孔１３ａ、１４ａは、２本の冷媒配管１１、１２において、径寸法が相違しており、略Ｕ字状の同じ形状に形成されている。具体的には、貫通孔１３ａ、１４ａの円周方向の一部に形成した開口部１３ｃ、１４ｃにより、貫通孔１３ａ、１４ａが外部へ開放する形状に形成されている。ここで、開口部１３ｃ、１４ｃの開口方向は、第１および第２の接続フランジ部材１０ａ、１０ｂの短辺方向Ｂと並行になっている。 The two through holes 13a and 14a have different diameters in the two refrigerant pipes 11 and 12, and are formed in the same substantially U-shape. Specifically, the through holes 13a and 14a are formed in a shape that opens to the outside by openings 13c and 14c formed in a part of the through holes 13a and 14a in the circumferential direction. Here, the opening direction of the openings 13c and 14c is parallel to the short side direction B of the first and second connection flange members 10a and 10b.

そして、この二つの貫通孔１３ａ、１４ａの一端面側、即ち図１中に示す外側端面に多角形状（例えば、八角形）の拡大凹部１３ｂ、１４ｂを形成している。この多角形状の拡大凹部１３ｂ、１４ｂの内接円径Ｄ１、Ｄ２は、貫通孔１３ａ、１４ａの内径Ｄ３、Ｄ４よりも所定量大きくしてある。 And the expansion recessed parts 13b and 14b of polygonal shape (for example, octagon) are formed in the one end surface side of these two through-holes 13a and 14a, ie, the outer side end surface shown in FIG. The inscribed circle diameters D1 and D2 of the polygonal enlarged recesses 13b and 14b are larger than the inner diameters D3 and D4 of the through holes 13a and 14a by a predetermined amount.

また、貫通孔１３ａの内径Ｄ３は冷媒配管１１の外径ｄ１より、また、貫通孔１４ａの内径Ｄ４は冷媒配管１２の外径ｄ２よりそれぞれ所定量大きくしてある。また、開口部１３ｃ、１４ｃの幅寸法Ｗ１、Ｗ２は、貫通孔１３ａ、１４ａの内径Ｄ３、Ｄ４と同じ寸法としてある。 Further, the inner diameter D3 of the through hole 13a is larger than the outer diameter d1 of the refrigerant pipe 11, and the inner diameter D4 of the through hole 14a is larger than the outer diameter d2 of the refrigerant pipe 12, respectively. The widths W1 and W2 of the openings 13c and 14c are the same as the inner diameters D3 and D4 of the through holes 13a and 14a.

また、第１および第２の接続フランジ部材１０ａ、１０ｂは金属製であり、本実施例では、アルミニウムもしくはアルミニウム合金製である。加工コスト低減のために、第１および第２の接続フランジ部材１０ａ、１０ｂは、ダイカスト加工により、図２の形状に一体成形している。勿論、第１および第２の接続フランジ部材１０ａ、１０ｂの形状を切削加工により形成することも可能であるが、切削加工によると加工コストが上昇する欠点が生ずる。なお、本実施形態では、第１および第２の接続フランジ部材１０ａ、１０ｂを金属の成形品としたが、樹脂の成形品であっても良い。 The first and second connecting flange members 10a and 10b are made of metal, and in this embodiment, are made of aluminum or an aluminum alloy. In order to reduce the processing cost, the first and second connection flange members 10a and 10b are integrally formed into the shape of FIG. 2 by die casting. Of course, the shapes of the first and second connection flange members 10a and 10b can be formed by cutting, but the cutting causes a disadvantage of increasing the processing cost. In the present embodiment, the first and second connection flange members 10a and 10b are metal molded products, but may be resin molded products.

次に、冷媒配管１１、１２について説明する。冷媒配管１１、１２は、図３に示すように、径寸法が相違しているだけの同一形状となっており、その材質は金属製、ここでは、アルミニウム製である。ただし、冷媒配管１１、１２のアルミニウム材料は、パイプ形状の成形性などからアルミニウム合金の中でも、比較的硬度の低い材料、具体的に、Ａ３００３−Ｏを用いている。 Next, the refrigerant pipes 11 and 12 will be described. As shown in FIG. 3, the refrigerant pipes 11 and 12 have the same shape with different diameters, and the material thereof is made of metal, here, aluminum. However, as the aluminum material for the refrigerant pipes 11 and 12, a material having a relatively low hardness, specifically, A3003-O is used among aluminum alloys because of the pipe formability and the like.

これに対し、第１および第２の接続フランジ部材１０ａ、１０ｂのアルミニウム材料は、後述する冷媒配管１１、１２の圧入固定、配管取りつけ部材としての強度確保のために、Ａ３００３−Ｏよりも機械的強度が高くて硬度の高いアルミニウム合金を用いている。 On the other hand, the aluminum material of the first and second connection flange members 10a and 10b is more mechanical than A3003-O in order to press-fit and fix the refrigerant pipes 11 and 12, which will be described later, and to secure strength as a pipe mounting member. An aluminum alloy having high strength and high hardness is used.

また、冷媒配管１１、１２の両端部付近には、径外方へ円環状の形状にて突出するバルジ部（円弧状突出部）１６、１７が周知のバルジ（ビード）加工により一体成形されている。このバルジ部１６、１７の外径Ｄ５、Ｄ６は、多角形状の拡大凹部１３ｂ、１４ｂの内接円径Ｄ１、Ｄ２よりも所定量小さくしてある。 In addition, bulge parts (arc-shaped projecting parts) 16 and 17 projecting in an annular shape outward in the diameter are integrally formed near both ends of the refrigerant pipes 11 and 12 by a known bulge (bead) process. Yes. The outer diameters D5 and D6 of the bulge parts 16 and 17 are smaller than the inscribed circle diameters D1 and D2 of the polygonal enlarged recesses 13b and 14b by a predetermined amount.

このバルジ部１６、１７よりもさらに先端側には、図示しないＯリングを収納する円環状の凹状溝部２０、２１が、周知のスピニング加工により成形されている。ここで、本実施形態では、冷媒配管１１、１２の下方側に形成されるバルジ部１６、１７を、第１のバルジ部１６、１７（円弧状突出部）と称し、冷媒配管１１、１２の上方側に形成されるバルジ部１６、１７を、第２のバルジ部（円弧状突出部）と称している。 Further to the front end side of the bulge parts 16 and 17, annular concave groove parts 20 and 21 for accommodating an O-ring (not shown) are formed by a known spinning process. Here, in this embodiment, the bulge parts 16 and 17 formed on the lower side of the refrigerant pipes 11 and 12 are referred to as first bulge parts 16 and 17 (arc-shaped protruding parts). The bulge parts 16 and 17 formed on the upper side are referred to as second bulge parts (arc-shaped projecting parts).

ところで、冷媒配管１１、１２に、上述した第１および第２のバルジ部１６、１７、凹状溝部２０、２１等を成形すると、バルジ加工及びスピニング加工により、各配管長さにバラツキが発生する。即ち、図３に示すように、一方の冷媒配管１１の配管長さＬ１と、他方の冷媒配管１２の配管長さＬ２とが相違する場合がある。図３の例では、冷媒配管１２の配管長さＬ２が、冷媒配管１１の配管長さＬ１よりも長くなっている。 By the way, when the first and second bulge parts 16 and 17 and the concave groove parts 20 and 21 described above are formed in the refrigerant pipes 11 and 12, the pipe lengths vary due to bulging and spinning. That is, as shown in FIG. 3, the pipe length L1 of one refrigerant pipe 11 and the pipe length L2 of the other refrigerant pipe 12 may be different. In the example of FIG. 3, the pipe length L <b> 2 of the refrigerant pipe 12 is longer than the pipe length L <b> 1 of the refrigerant pipe 11.

このような場合においては、第２の接続フランジ部材１０ａの拡大凹部１３ｂ、１４ｂに冷媒配管１１、１２の第２バルジ部１６、１７を、また、第１の接続フランジ部材１０ｂの拡大凹部１３ｂには、配管長さの短い冷媒配管１１の第１のバルジ部１６を、圧入固定（冷媒配管１１、１２を第１および第２の接続フランジ部材１０ａ、１０ｂの開口部１３ｃ、１４ｃから貫通孔１３ａ、１４ａに圧入）させることができるが、第１の接続フランジ部材１０ｂの拡大凹部１４ｂに、冷媒配管１２の第１のバルジ部１７を圧入固定させることができないという問題が発生する。 In such a case, the second bulge portions 16 and 17 of the refrigerant pipes 11 and 12 are provided in the enlarged concave portions 13b and 14b of the second connection flange member 10a, and the enlarged concave portion 13b of the first connection flange member 10b. The first bulge portion 16 of the refrigerant pipe 11 having a short pipe length is press-fitted and fixed (the refrigerant pipes 11 and 12 are connected to the through holes 13a and 14c from the openings 13c and 14c of the first and second connection flange members 10a and 10b). However, there is a problem that the first bulge portion 17 of the refrigerant pipe 12 cannot be press-fitted and fixed in the enlarged concave portion 14b of the first connection flange member 10b.

また、図３の例では、下方の拡大凹部１４ｂに、配管長さが長い方の冷媒配管１２の第１のバルジ部１７を強引に圧入固定させても、拡大凹部１４ｂから第１のバルジ部１７が外れてしまうこともある。 In the example of FIG. 3, even if the first bulge portion 17 of the refrigerant pipe 12 having the longer pipe length is forcibly press-fitted and fixed to the lower enlarged concave portion 14 b, the first bulge portion extends from the enlarged concave portion 14 b. 17 may come off.

そこで、本実施形態では、冷媒配管１１、１２に外方へ膨らませた膨らみ部１８、１９（図１参照）を形成する工程を備えている。即ち、冷媒配管１１、１２の配管径ｄ１、ｄ２を外方に拡張させることにより、膨らみ部１８、１９を形成し、この膨らみ部１８、１９を形成する過程において、配管長さのバラツキを補正することができる。 In view of this, the present embodiment includes a step of forming the bulging portions 18 and 19 (see FIG. 1) bulging outward in the refrigerant pipes 11 and 12. That is, by expanding the pipe diameters d1 and d2 of the refrigerant pipes 11 and 12 outward, the bulging portions 18 and 19 are formed, and in the process of forming the bulging portions 18 and 19, variations in pipe length are corrected. can do.

この膨らみ部１８、１９は、下方に配置する第１の接続フランジ部材１０ｂの内側端面に近接して設けられている。つまり、膨らみ部１８、１９は、冷媒配管１１、１２の下方に配置される第１のバルジ部１６、１７とは反対側となる第１の接続フランジ部材１０ｂの内側に形成されている。従って、膨らみ部１８、１９と第１のバルジ部１６、１７との間に、第１の接続フランジ部材１０ｂが配設されている。 The bulging portions 18 and 19 are provided close to the inner end face of the first connection flange member 10b disposed below. That is, the bulging portions 18 and 19 are formed inside the first connection flange member 10b that is opposite to the first bulge portions 16 and 17 disposed below the refrigerant pipes 11 and 12. Accordingly, the first connecting flange member 10b is disposed between the bulging portions 18 and 19 and the first bulge portions 16 and 17.

次に、以上の構成による配管継手組立体の組み立て方法を説明する。まず、組み立てる前に、第１および第２の接続フランジ部材１０ａ、１０ｂと冷媒配管１１、１２とは、それぞれの形状に予め単品の状態で成形されている。第１および第２の接続フランジ部材１０ａ、１０ｂは、ダイカスト加工によって、図２に示す形状に成形されている。また、冷媒配管１１、１２は、図３に示す形状、即ち、両端部側に円環状の凹状溝部２０、２１と、その反先端側に第１および第２のバルジ部１６、１７とが予め成形により形成されている。なお、冷媒配管１１、１２の全体形状は、直管形状に形成されている。 Next, a method for assembling the pipe joint assembly having the above configuration will be described. First, before assembling, the first and second connecting flange members 10a and 10b and the refrigerant pipes 11 and 12 are preliminarily formed in a single product in their respective shapes. The first and second connection flange members 10a and 10b are formed into the shape shown in FIG. 2 by die casting. In addition, the refrigerant pipes 11 and 12 have the shape shown in FIG. 3, that is, annular concave grooves 20 and 21 on both ends, and first and second bulges 16 and 17 on the opposite ends. It is formed by molding. In addition, the whole shape of the refrigerant | coolant piping 11 and 12 is formed in the straight pipe shape.

第１および第２のバルジ部１６、１７は、上述したように、バルジ加工により一体成形されており、凹状溝部２０、２１は、上述したように、スピニング加工により成形されている。また、冷媒配管１１、１２のそれぞれは、配管長さＬ１、Ｌ２が予め測定されている（図３参照）。また、冷媒配管１１、１２のそれぞれの配管長さＬ１、Ｌ２が、所定の配管長さＬ０を超えていることを確認する。 As described above, the first and second bulge portions 16 and 17 are integrally formed by bulge processing, and the concave groove portions 20 and 21 are formed by spinning processing as described above. In addition, the pipe lengths L1 and L2 of the refrigerant pipes 11 and 12 are measured in advance (see FIG. 3). Further, it is confirmed that the pipe lengths L1 and L2 of the refrigerant pipes 11 and 12 exceed the predetermined pipe length L0.

なお、一対の冷媒配管１１、１２は、少なくともいずれか一方の冷媒配管１１、１２が、所定の配管長さＬ０であれば、所定の配管長さＬ０を超えている他方の冷媒配管１１、１２と組み合わせることができる。また、一対の冷媒配管１１、１２が、ともに所定の配管長さＬ０を超えている場合であっても組み合わせることができる。 In addition, a pair of refrigerant | coolant piping 11 and 12 will be the other refrigerant | coolant piping 11 and 12 exceeding the predetermined piping length L0 if at least any one refrigerant piping 11 and 12 is the predetermined piping length L0. Can be combined. Moreover, even if it is a case where a pair of refrigerant | coolant piping 11 and 12 is over both predetermined piping length L0, it can combine.

本実施形態では、所定の配管長さＬ０を超えている冷媒配管１１、１２に、膨らみ部１８、１９を形成して、組み合わされた一対の冷媒配管１１、１２を、所定の同一配管長さＬ０となるように組み立てるものである。 In the present embodiment, the swelled portions 18 and 19 are formed in the refrigerant pipes 11 and 12 that exceed the predetermined pipe length L0, and the combined refrigerant pipes 11 and 12 are combined into a predetermined same pipe length. It is assembled so as to be L0.

従って、本実施形態では、第１工程（冷媒配管１１、１２を、第１の接続フランジ部材１０ｂに圧入する固定）→第２工程（膨らみ部１８、１９を形成する工程）→第３工程（冷媒配管１１、１２を、第２の接続フランジ部材１０ａに圧入する固定）の順に組み立てるようになっている。 Therefore, in this embodiment, the first step (fixing the refrigerant pipes 11 and 12 into the first connection flange member 10b) → second step (step of forming the bulging portions 18 and 19) → third step ( The refrigerant pipes 11 and 12 are assembled in the order of fixing to press-fit into the second connection flange member 10a.

第１工程は、膨らみ部１８、１９側に配置される第１の接続フランジ部材１０ｂに冷媒配管１１、１２を圧入固定する工程である。つまり、第１の接続フランジ部材１０ｂの拡大凹部１３ｂ、１４ｂに圧入により第１のバルジ部１６、１７を圧入固定させる工程である。 The first process is a process of press-fitting and fixing the refrigerant pipes 11 and 12 to the first connection flange member 10b disposed on the bulging portions 18 and 19 side. That is, this is a step of press-fitting and fixing the first bulge portions 16 and 17 by press-fitting into the enlarged recesses 13b and 14b of the first connection flange member 10b.

図４は、配管継手組立体の圧入装置の構成を示す断面図である。圧入装置は、図４に示すように、固定部２２と、この固定部２２の上側に配置され、上下方向に移動可能な可動部２３とを備えている。可動部２３には、冷媒配管１１、１２の直管部を挿入可能な貫通孔２３ａ、２３ｂが形成されている。 FIG. 4 is a cross-sectional view showing the configuration of the press-fitting device for the pipe joint assembly. As shown in FIG. 4, the press-fitting device includes a fixed portion 22 and a movable portion 23 that is disposed on the upper side of the fixed portion 22 and is movable in the vertical direction. The movable portion 23 is formed with through holes 23a and 23b into which the straight pipe portions of the refrigerant pipes 11 and 12 can be inserted.

固定部２２は、位置決め凹部２２ａ、２２ｂを有し、この位置決め凹部２２ａ、２２ｂ内に冷媒配管１１、１２の第１のバルジ部１６、１７よりも下方の端部側を収納した状態で、第１のバルジ部１６、１７を固定部２２の上面に当接させて、冷媒配管１１、１２を固定部２２に位置決め配置する。 The fixing portion 22 has positioning recesses 22a and 22b, and in the positioning recesses 22a and 22b, the first end portions below the first bulge portions 16 and 17 of the refrigerant pipes 11 and 12 are accommodated. One bulge part 16, 17 is brought into contact with the upper surface of the fixing part 22, and the refrigerant pipes 11, 12 are positioned and arranged on the fixing part 22.

次いで、冷媒配管１１、１２が貫通孔１３ａ、１４ａに嵌合するように、第１の接続フランジ部材１０ｂを位置決め配置する。次に、可動部２３を第１の接続フランジ部材１０ｂの上面に配置する。そして、図示しない加圧用プレス装置により、可動部２３に、図４中に示す矢印Ａの方向に加圧力を加えて、可動部２３および第１の接続フランジ部材１０ｂを固定部２２の方向に押し下げる。 Next, the first connection flange member 10b is positioned and arranged so that the refrigerant pipes 11 and 12 are fitted into the through holes 13a and 14a. Next, the movable part 23 is disposed on the upper surface of the first connection flange member 10b. Then, a pressing device (not shown) applies pressure to the movable portion 23 in the direction of arrow A shown in FIG. 4 to push down the movable portion 23 and the first connecting flange member 10b toward the fixed portion 22. .

この際に、多角形状の拡大凹部１３ｂ、１４ｂの内接円径Ｄ１、Ｄ２よりも冷媒配管１１、１２の第１のバルジ部１６、１７の外径Ｄ５、Ｄ６を所定量小さくしてあるため、第１のバルジ部１６、１７の外周面が拡大凹部１３ｂ、１４ｂの多角形状に倣って変形する。つまり、第１の接続フランジ部材１０ｂは、第１のバルジ部１６、１７の外周面の変形を起こしながら下方に移動する。 At this time, the outer diameters D5 and D6 of the first bulge portions 16 and 17 of the refrigerant pipes 11 and 12 are smaller than the inscribed circle diameters D1 and D2 of the polygonal enlarged recesses 13b and 14b by a predetermined amount. The outer peripheral surfaces of the first bulge parts 16 and 17 are deformed following the polygonal shape of the enlarged recesses 13b and 14b. That is, the first connecting flange member 10b moves downward while causing deformation of the outer peripheral surfaces of the first bulge portions 16 and 17.

これにより、第１のバルジ部１６、１７の外周面が拡大凹部１３ｂ、１４ｂの多角形状の内壁面に密に圧接する。ここで、第１のバルジ部１６、１７には多角形状に倣う変形を元に戻そうとする復元力が発生するので、この復元力によって第１のバルジ部１６、１７の外周面が拡大凹部１３ｂ、１４ｂの多角形状の内壁面に強く圧接する。この結果、冷媒配管１１、１２は、第１のバルジ部１６、１７の部位にて第１の接続フランジ部材１０ｂに強固に圧入固定される。 As a result, the outer peripheral surfaces of the first bulge portions 16 and 17 are in close pressure contact with the polygonal inner wall surfaces of the enlarged recesses 13b and 14b. Here, since a restoring force is generated in the first bulge portions 16 and 17 to restore the deformation following the polygonal shape, the outer circumferential surfaces of the first bulge portions 16 and 17 are enlarged by the restoring force. Strongly press-contact the polygonal inner wall surfaces 13b and 14b. As a result, the refrigerant pipes 11 and 12 are firmly press-fitted and fixed to the first connection flange member 10 b at the first bulge portions 16 and 17.

なお、第１のバルジ部１６、１７の外径Ｄ５、Ｄ６と多角形状の拡大凹部１３ｂ、１４ｂの内接円径Ｄ１、Ｄ２との直径差は、０．２〜１．２ｍｍ程度の範囲である。また、図４は、第１の接続フランジ部材１０ｂのうち、拡大凹部１３ｂ、１４ｂ側の面が固定部２２の上端面に当接して、第１の接続フランジ部材１０ｂの下方への移動が終了した状態、つまり、冷媒配管１１、１２の圧入固定が終了した状態を示している。 The difference in diameter between the outer diameters D5 and D6 of the first bulge parts 16 and 17 and the inscribed circle diameters D1 and D2 of the polygonal enlarged recesses 13b and 14b is in the range of about 0.2 to 1.2 mm. is there. Further, FIG. 4 shows that the surface of the first connecting flange member 10b on the side of the enlarged recesses 13b and 14b comes into contact with the upper end surface of the fixing portion 22, and the downward movement of the first connecting flange member 10b is completed. In other words, the state in which the press-fitting and fixing of the refrigerant pipes 11 and 12 is completed is shown.

次に、第２工程は、第１の接続フランジ部材１０ｂの端面の直近に膨らみ部１８、１９を形成する工程である。つまり、冷媒配管１１、１２の外径を外方に拡張させる工程である。図５は、冷媒配管１１、１２の拡張装置の構成を示す断面図である。拡張装置は、図５に示すように、保持部２４と型部２５とから構成されている。保持部２４は、一対の冷媒配管１１、１２を保持する基盤である。保持部２４には、貫通孔２４ａ、２４ｂが形成されている。 Next, a 2nd process is a process of forming the bulging parts 18 and 19 in the immediate vicinity of the end surface of the 1st connection flange member 10b. That is, this is a step of expanding the outer diameter of the refrigerant pipes 11 and 12 outward. FIG. 5 is a cross-sectional view showing the configuration of the expansion device for the refrigerant pipes 11 and 12. As shown in FIG. 5, the expansion device includes a holding part 24 and a mold part 25. The holding unit 24 is a base that holds the pair of refrigerant pipes 11 and 12. Through holes 24 a and 24 b are formed in the holding portion 24.

型部２５は、冷媒配管１１、１２の直管部に膨らみ部１８、１９を形成するための型である。型部２５は、半割れ状に形成され、かつ膨らみ部１８、１９の外径に応じた中空部２５ａ、２５ｂと貫通孔２５ｃ、２５ｄとが形成されている。貫通孔２５ｃ、２５ｄの内周面には、冷媒配管１１、１２の外周が密接される。 The mold part 25 is a mold for forming the bulging parts 18 and 19 in the straight pipe parts of the refrigerant pipes 11 and 12. The mold part 25 is formed in a half crack shape, and hollow parts 25a and 25b and through holes 25c and 25d corresponding to the outer diameters of the bulging parts 18 and 19 are formed. The outer circumferences of the refrigerant pipes 11 and 12 are in close contact with the inner circumferential surfaces of the through holes 25c and 25d.

そのため、貫通孔２５ｃ、２５ｄの分割面には、冷媒配管１１、１２の外形形状に倣うように形成されている。また、型部２５の下面側は、第１の接続フランジ部材１０ｂの上面側と密接するように形成されている。さらに、冷媒配管１１、１２の一端は、図示しない液圧装置に接続されている。 Therefore, the dividing surfaces of the through holes 25c and 25d are formed so as to follow the outer shape of the refrigerant pipes 11 and 12. Further, the lower surface side of the mold portion 25 is formed so as to be in close contact with the upper surface side of the first connection flange member 10b. Furthermore, one ends of the refrigerant pipes 11 and 12 are connected to a hydraulic device (not shown).

ここで、第２工程の手順を説明する。まず、第１工程で冷媒配管１１、１２が圧入固定された第１の接続フランジ部材１０ｂを、保持部２４の上面側に配置する。次に、型部２５を、第１の接続フランジ部材１０ｂの上面側に圧接するように配置して固定する。そして、液圧装置により、冷媒配管１１、１２の内部に圧力を掛ける。その結果、中空部２５ａ、２５ｂに位置する冷媒配管１１、１２の直管部において、径方向外方に拡張する膨らみ部１８、１９が形成される。 Here, the procedure of the second step will be described. First, the first connection flange member 10 b in which the refrigerant pipes 11 and 12 are press-fitted and fixed in the first step is disposed on the upper surface side of the holding portion 24. Next, the mold part 25 is disposed and fixed so as to be in pressure contact with the upper surface side of the first connection flange member 10b. Then, pressure is applied to the inside of the refrigerant pipes 11 and 12 by a hydraulic device. As a result, in the straight pipe portions of the refrigerant pipes 11 and 12 located in the hollow portions 25a and 25b, bulge portions 18 and 19 that extend radially outward are formed.

そして、この膨らみ部１８、１９が形成されることにより、冷媒配管１１、１２の配管長さを短くすることができる。つまり、冷媒配管１１、１２の軸方向の長さを調節することができる。 And the piping length of the refrigerant | coolant piping 11 and 12 can be shortened by forming these bulging parts 18 and 19. FIG. That is, the axial length of the refrigerant pipes 11 and 12 can be adjusted.

より具体的には、膨らみ部１８、１９の径方向外方に延びる大きさを調整することにより、軸方向の配管長さを所定の配管長さＬ０に設定することができる。なお、膨らみ部１８、１９を形成する工程においては、それぞれの冷媒配管１１、１２の配管長さが通常異なっているため、それぞれ一本ずつ、膨らみ工程を行って、所定の配管長さＬ０に形成している。 More specifically, the pipe length in the axial direction can be set to a predetermined pipe length L0 by adjusting the size of the bulging portions 18 and 19 extending radially outward. In the process of forming the bulging portions 18 and 19, since the pipe lengths of the refrigerant pipes 11 and 12 are usually different, the bulging process is performed one by one to obtain a predetermined pipe length L0. Forming.

なお、本実施形態では、拡張により膨らみ部１８、１９を形成して、所定の配管長さＬ０に形成したが、配管長さの縮み量が多量であれば、膨らみ部１８、１９を形成するときに、併せて冷媒配管１１、１２の両端を軸方向に圧縮させても良い。これによれば、所定の配管長さＬ０が容易に形成することができる。 In the present embodiment, the bulging portions 18 and 19 are formed by expansion to form a predetermined pipe length L0. However, if the amount of contraction of the pipe length is large, the bulging portions 18 and 19 are formed. Sometimes, both ends of the refrigerant pipes 11 and 12 may be compressed in the axial direction. According to this, the predetermined pipe length L0 can be easily formed.

また、第１の接続フランジ部材１０ｂの直近に膨らみ部１８、１９が形成されることにより、接続フランジ部材１０ｂと冷媒配管１１、１２とをより強固に固定することができる。そして、次に第３工程を実行する。この第３工程は、第１工程と全く同じ手順で行う。つまり、図４に示すように、圧入装置を用いて、冷媒配管１１、１２の上端側に、第２の接続フランジ部材１０ａを圧入により圧入固定させる工程である。 Further, since the bulging portions 18 and 19 are formed in the immediate vicinity of the first connection flange member 10b, the connection flange member 10b and the refrigerant pipes 11 and 12 can be more firmly fixed. Then, the third step is executed. This third step is performed in exactly the same procedure as the first step. That is, as shown in FIG. 4, the second connecting flange member 10a is press-fitted and fixed to the upper end sides of the refrigerant pipes 11 and 12 by using a press-fitting device.

ここでは、既に配管長さが所定の配管長さＬ０に形成されているため、第１工程と同様に、冷媒配管１１、１２を第２のバルジ部１６、１７の部位にて、第２の接続フランジ部材１０ａに強固に圧入固定することができる。 Here, since the pipe length has already been formed to the predetermined pipe length L0, the refrigerant pipes 11 and 12 are connected to the second bulge portions 16 and 17 at the second bulge portions 16 and 17 as in the first step. The connection flange member 10a can be firmly press-fitted and fixed.

以上の第１実施形態による配管継手組立体およびその製造方法によれば、少なくとも一方の冷媒配管１１、１２に、貫通孔１３ａ、１４ａの上端面側の直近に配管径を拡張する膨らみ部１８、１９を設けることにより、冷媒配管１１、１２の軸方向の長さのばらつきを補正することができる。従って、圧入固定後の寸法精度の向上が図れる。 According to the pipe joint assembly and the manufacturing method therefor according to the first embodiment described above, at least one refrigerant pipe 11, 12 has a bulge portion 18 that expands the pipe diameter immediately adjacent to the upper end surface side of the through holes 13 a, 14 a, By providing 19, the variation in the axial length of the refrigerant pipes 11 and 12 can be corrected. Therefore, it is possible to improve the dimensional accuracy after press-fitting.

また、冷媒配管１１、１２の他端を、第２の接続フランジ部材１０ａに圧入固定する第３工程の前に、膨らみ部１８、１９を形成する工程を備えることにより、配管長さのばらつきを補正することができる。従って、寸法精度の向上が図れる。さらに、第２の接続フランジ部材１０ａと一対の冷媒配管１１、１２との組付けが容易にできる。また、第１および第２の接続フランジ部材１０ａ、１０ｂと一対の冷媒配管１１、１２との接合強度を増加することができる。 In addition, by providing a step of forming the bulging portions 18 and 19 before the third step of press-fitting and fixing the other ends of the refrigerant pipes 11 and 12 to the second connection flange member 10a, variations in pipe length can be achieved. It can be corrected. Therefore, the dimensional accuracy can be improved. Furthermore, the second connecting flange member 10a and the pair of refrigerant pipes 11 and 12 can be easily assembled. Further, the bonding strength between the first and second connecting flange members 10a and 10b and the pair of refrigerant pipes 11 and 12 can be increased.

（第２実施形態）
以上の第１実施形態では、冷媒配管１１、１２の両端側に、同一形状（拡大凹部１３ｂ、１４ｂの形成面は、上下対称）の第１および第２の接続フランジ部材１０ａ、１０ｂを配置したが、膨らみ部１８、１９側に配置される第１の接続フランジ部材１０ｃ（図６参照）は、拡大凹部１３ｂ、１４ｂを形成しない貫通孔１３ａ、１４ａとしても良い。図６は、本実施形態における配管継手組立体の全体構成を示す断面図である。図７は、膨らみ部１８、１９側に配置される第１の接続フランジ部材１０ｃの構成を示す平面図である。 (Second Embodiment)
In the first embodiment described above, the first and second connection flange members 10a and 10b having the same shape (the formation surfaces of the enlarged recesses 13b and 14b are vertically symmetrical) are arranged on both ends of the refrigerant pipes 11 and 12, respectively. However, the 1st connection flange member 10c (refer FIG. 6) arrange | positioned at the swelling parts 18 and 19 side is good also as the through-holes 13a and 14a which do not form the expansion recessed parts 13b and 14b. FIG. 6 is a cross-sectional view showing the overall configuration of the pipe joint assembly in the present embodiment. FIG. 7 is a plan view showing a configuration of the first connection flange member 10c arranged on the bulging portions 18 and 19 side.

この第１の接続フランジ部材１０ｃには、図７に示すように、その板厚方向に貫通する二つの貫通孔１３ａ、１４ａが形成されている。一方の貫通孔１３ａは、第１の接続フランジ部材１０ｃの長辺方向の一端側に位置し、他方の貫通孔１４ａは、第１の接続フランジ部材１０ｃの長辺方向の他端側に位置している。 As shown in FIG. 7, the first connection flange member 10c is formed with two through holes 13a and 14a penetrating in the plate thickness direction. One through hole 13a is located on one end side in the long side direction of the first connection flange member 10c, and the other through hole 14a is located on the other end side in the long side direction of the first connection flange member 10c. ing.

二つの貫通孔１３ａ、１４ａは、上記第１実施形態と同じように、径寸法が相違しており、略Ｕ字状の同じ形状に形成されている。そして、貫通孔１３ａ、１４ａの両端面側は、平面状に形成されている。本実施形態では、貫通孔１３ａ、１４ａの一端面側には、第１のバルジ部１６、１７が嵌合する拡大凹部１３ｂ、１４ｂが形成されておらず、平面状に形成されている。 The two through-holes 13a and 14a have different diameters and are formed in the same substantially U-shape as in the first embodiment. And the both end surface side of the through-holes 13a and 14a is formed in planar shape. In the present embodiment, the enlarged concave portions 13b and 14b into which the first bulge portions 16 and 17 are fitted are not formed on one end surface side of the through holes 13a and 14a, but are formed in a planar shape.

従って、膨らみ部１８、１９側に配置される第１の接続フランジ部材１０ｃは、図６に示すように、膨らみ部１８、１９と第１のバルジ部１６、１７との間に配置されている。具体的には、膨らみ部１８、１９が、第１のバルジ部１６、１７の反接続面１６ａ、１７ａ側に第１の接続フランジ部材１０ｃの一端面側を挟むように圧接するように形成されている。これにより、冷媒配管１１、１２と第１の接続フランジ部材１０ｃとを保持固定できる。 Accordingly, the first connection flange member 10c disposed on the bulging portions 18 and 19 side is disposed between the bulging portions 18 and 19 and the first bulge portions 16 and 17, as shown in FIG. . Specifically, the bulging portions 18 and 19 are formed so as to be in pressure contact with the opposite connection surfaces 16a and 17a side of the first bulge portions 16 and 17 so as to sandwich one end surface side of the first connection flange member 10c. ing. Thereby, the refrigerant | coolant piping 11 and 12 and the 1st connection flange member 10c can be hold | maintained and fixed.

以上のような構成によれば、第１の接続フランジ部材１０ｃの内側端面に近接して、膨らみ部１８、１９を形成することにより、配管長さのばらつきを補正することができる。これにより、寸法精度の向上が図れる。さらに、膨らみ部１８、１９側に配置される第１の接続フランジ部材１０ｃは、拡大凹部１３ｂ、１４ｂを形成することがないため、薄型の板材により簡素な形状に形成することができる。 According to the configuration as described above, variations in pipe length can be corrected by forming the bulging portions 18 and 19 close to the inner end face of the first connection flange member 10c. As a result, the dimensional accuracy can be improved. Further, the first connection flange member 10c disposed on the bulging portions 18 and 19 side does not form the enlarged recesses 13b and 14b, and therefore can be formed in a simple shape with a thin plate material.

（第３実施形態）
以上の実施形態では、配管径を拡張させて膨らみ部１８、１９を形成したが、膨らみ部１８、１９を径外方に突出する円環状の突出部であっても良い。図８は、本実施形態における配管継手組立体の全体構成を示す断面図である。本実施形態の膨らみ部１８、１９は、図８に示すように、バルジ加工により形成されている。つまり、膨らみ部１８、１９の先端側に形成される第１のバルジ部１６、１７と同じように形成されている。 (Third embodiment)
In the above embodiment, the bulging portions 18 and 19 are formed by expanding the pipe diameter. However, the bulging portions 18 and 19 may be annular projecting portions protruding outward in the diameter. FIG. 8 is a cross-sectional view showing the overall configuration of the pipe joint assembly in the present embodiment. As shown in FIG. 8, the bulging portions 18 and 19 of the present embodiment are formed by bulging. That is, it is formed in the same manner as the first bulge parts 16 and 17 formed on the tip side of the bulging parts 18 and 19.

以上のような構成によれば、貫通孔１３ａ、１４ａの反接続面側の直近に、円環状の膨らみ部１８、１９を形成することにより、冷媒配管１１、１２と第１の接続フランジ部材１０ｂとを強固に固定することができる。また、配管長さのばらつきを補正することができるため、寸法精度の向上が図れる。 According to the configuration described above, the refrigerant pipes 11 and 12 and the first connection flange member 10b are formed by forming the annular bulge portions 18 and 19 in the immediate vicinity of the through holes 13a and 14a on the side opposite to the connection surface. Can be firmly fixed. Moreover, since the variation in the pipe length can be corrected, the dimensional accuracy can be improved.

（第４実施形態）
以上の実施形態では、第１のバルジ部１６、１７を形成した後に、膨らみ部１８、１９を形成するように構成したが、第１のバルジ部１６、１７と膨らみ部１８、１９とをほぼ同時に形成するように構成しても良い。図９は、本実施形態における配管継手組立体の全体構成を示す断面図である。 (Fourth embodiment)
In the above embodiment, the bulge portions 18 and 19 are formed after the first bulge portions 16 and 17 are formed. However, the first bulge portions 16 and 17 and the bulge portions 18 and 19 are substantially formed. You may comprise so that it may form simultaneously. FIG. 9 is a cross-sectional view showing the overall configuration of the pipe joint assembly in the present embodiment.

本実施形態の配管継手組立体は、図９に示すように、膨らみ部１８、１９と第１のバルジ部１６、１７との間に、第１の接続フランジ部材１０ｃを挟むように組み立てられている。そして、第１の接続フランジ部材１０ｃの外側には、第１のバルジ部１６、１７が上記第３実施形態と同じように、バルジ加工により形成されている。更に、第１の接続フランジ部材１０ｃの内側には、膨らみ部１８、１９が配管径を拡張させて形成されている。 As shown in FIG. 9, the pipe joint assembly according to the present embodiment is assembled so that the first connection flange member 10 c is sandwiched between the bulging portions 18 and 19 and the first bulge portions 16 and 17. Yes. And the 1st bulge part 16 and 17 is formed in the outer side of the 1st connection flange member 10c by the bulge process similarly to the said 3rd Embodiment. Furthermore, bulging portions 18 and 19 are formed on the inner side of the first connection flange member 10c by expanding the pipe diameter.

より具体的には、冷媒配管１１、１２の上端側に、第２の接続フランジ部材１０ａを圧入により圧入固定させる工程の後に、第１の接続フランジ部材１０ｃの外側に第１のバルジ部１６、１７を形成し、その直後に、第１の接続フランジ部材１０ｃの内側に、膨らみ部１８、１９を形成している。これにより、冷媒配管１１、１２と第１の接続フランジ部材１０ｃとを保持固定できる。また、配管長さのばらつきを補正することができるため、寸法精度の向上が図れる。 More specifically, after the step of press-fitting and fixing the second connection flange member 10a to the upper ends of the refrigerant pipes 11 and 12, the first bulge portion 16 on the outside of the first connection flange member 10c, 17 is formed, and immediately after that, the bulging portions 18 and 19 are formed inside the first connection flange member 10c. Thereby, the refrigerant | coolant piping 11 and 12 and the 1st connection flange member 10c can be hold | maintained and fixed. Moreover, since the variation in the pipe length can be corrected, the dimensional accuracy can be improved.

また、膨らみ部１８、１９側に配置される第１の接続フランジ部材１０ｃは、上記第２実施形態と同じように、拡大凹部１３ｂ、１４ｂを形成することがないため、薄型の板材により簡素な形状に形成することができる。 Moreover, since the 1st connection flange member 10c arrange | positioned at the bulging part 18 and 19 side does not form the enlarged recessed parts 13b and 14b similarly to the said 2nd Embodiment, it is simple by a thin board | plate material. It can be formed into a shape.

なお、本実施形態では、冷媒配管１１、１２の上端側を圧入固定させた後に、膨らみ部１８、１９と第１のバルジ部１６、１７とを形成させたが、第１のバルジ部１６、１７と膨らみ部１８、１９とを形成した後に、冷媒配管１１、１２の上端側を圧入固定させても良い。 In this embodiment, the bulging portions 18 and 19 and the first bulge portions 16 and 17 are formed after the upper ends of the refrigerant pipes 11 and 12 are press-fitted and fixed. 17 and the bulging portions 18 and 19 may be formed, and the upper ends of the refrigerant pipes 11 and 12 may be press-fitted and fixed.

また、本実施形態の冷媒配管１１、１２の下端側は、第１のバルジ部１６、１７の先端側に凹状溝部２０、２１が形成されていない。つまり、本実施形態では、図示しないＯリングが第１のバルジ部１６、１７の先端側に外嵌されるようになっている。 Moreover, the recessed groove parts 20 and 21 are not formed in the front end side of the 1st bulge parts 16 and 17 at the lower end side of the refrigerant | coolant piping 11 and 12 of this embodiment. That is, in the present embodiment, an O-ring (not shown) is fitted on the front end side of the first bulge parts 16 and 17.

（他の実施形態）
以上の実施形態では、拡大凹部１３ｂ、１４ｂの形状を多角形状（例えば、八角形）に形成したが、この多角形状は、言い換えれば、貫通孔１３ａ、１４ａの内径に対して、近接する部位と遠ざかる部位とを円周方向に繰り返して形成する非円形状である。従って、拡大凹部１３ｂ、１４ｂの形状を、その拡大凹部１３ｂ、１４ｂの円周方向に連なる波型の凹凸状からなるセレーション形状で形成しても良い。 (Other embodiments)
In the above embodiment, the shape of the enlarged recesses 13b and 14b is formed in a polygonal shape (for example, an octagonal shape). In other words, this polygonal shape is a region close to the inner diameter of the through holes 13a and 14a. It is a non-circular shape in which the part that moves away is repeatedly formed in the circumferential direction. Therefore, you may form the shape of the expansion recessed parts 13b and 14b by the serration shape which consists of a corrugated uneven | corrugated shape connected to the circumferential direction of the expansion recessed parts 13b and 14b.

第１実施形態における配管継手組立体の全体構成を示す断面図である。It is sectional drawing which shows the whole structure of the piping joint assembly in 1st Embodiment. 第１実施形態における第１および第２の接続フランジ部材の構成を示す平面図である。It is a top view which shows the structure of the 1st and 2nd connection flange member in 1st Embodiment. 膨らみ部を形成する前における２本の冷媒配管の構成を示す断面図である。It is sectional drawing which shows the structure of two refrigerant | coolant piping before forming a bulging part. 第１実施形態における配管継手組立体の圧入装置の構成を示す断面図である。It is sectional drawing which shows the structure of the press-fitting apparatus of the pipe joint assembly in 1st Embodiment. 第１実施形態における配管継手組立体の拡張装置の構成を示す断面図である。It is sectional drawing which shows the structure of the expansion apparatus of the pipe joint assembly in 1st Embodiment. 第２実施形態における配管継手組立体の全体構成を示す断面図である。It is sectional drawing which shows the whole structure of the piping joint assembly in 2nd Embodiment. 第２実施形態における第１の接続フランジ部材の構成を示す平面図である。It is a top view which shows the structure of the 1st connection flange member in 2nd Embodiment. 第３実施形態における配管継手組立体の全体構成を示す断面図である。It is sectional drawing which shows the whole structure of the piping joint assembly in 3rd Embodiment. 第４実施形態における配管継手組立体の全体構成を示す断面図である。It is sectional drawing which shows the whole structure of the piping joint assembly in 4th Embodiment. 従来技術における配管継手組立体の課題を示す断面図である。It is sectional drawing which shows the subject of the pipe joint assembly in a prior art.

Explanation of symbols

１０ａ…第２の接続フランジ部材
１０ｂ、１０ｃ…第１の接続フランジ部材
１１、１２…冷媒配管（第１、第２の配管）
１３ａ、１４ａ…貫通孔
１３ｂ、１４ｂ…拡大凹部
１３ｃ、１４ｃ…開口部
１６、１７…第１および第２のバルジ部（第１および第２の円環状突出部）
１８、１９…膨らみ部
Ｂ…短辺方向 10a ... 2nd connection flange member 10b, 10c ... 1st connection flange member 11, 12 ... Refrigerant piping (1st, 2nd piping)
13a, 14a ... through holes 13b, 14b ... enlarged recesses 13c, 14c ... openings 16, 17 ... first and second bulge parts (first and second annular projecting parts)
18, 19 ... bulge part B ... short side direction

Claims

A straight pipe portion, a first annular projecting portion (16) formed on one end side of the straight pipe portion and projecting radially outward; and formed on the other end side of the straight pipe portion and radially outward. A first pipe (11) having a second annular protrusion (16) protruding;
A straight pipe part, a first annular projecting part (17) formed on one end side of the straight pipe part and projecting radially outward; and formed on the other end side of the straight pipe part and radially outward. A second pipe (12) having a protruding second annular protrusion (17);
The first and second pipes (11, 12) have through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are inserted, respectively. A first connection flange member (10b, 10c) in which the annular protrusions (16, 17) are fixed to the outer end face;
There are through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are inserted, respectively, and the second of the first and second pipes (11, 12). In a pipe joint assembly comprising an annular protrusion (16, 17) and a second connecting flange member (10a) fixed to the outer end face,
An outer end surface of the second connection flange member (10a) to which the second annular protrusion (16, 17) is fixed is larger than the inner diameter of the through hole (13a, 14a) and the second circle. An enlarged recess (13b, 14b) larger than the outer diameter of the annular protrusion (16, 17) is formed,
The second annular protrusion (16, 17) is press-fitted and fixed to the enlarged recess (13b, 14b);
In a pipe that is at least one of the first and second pipes (11, 12) and exceeds a predetermined pipe length (L0) , and the first annular protrusion (16, 17) Is a bulge portion that expands the outer diameter of the pipe in the vicinity of the end face of the first connection flange member (10b, 10c) inside the first connection flange member (10b, 10c) on the opposite side. 18 and 19) are formed, and by forming the bulge portion, the pipe length of the pipe is shortened, and the pair of the first and second pipes (11, 12) combined are predetermined. Of the first connecting flange member (10b, 10), between the bulging portion (18, 19) and the first annular protrusion (16, 17). 10c) with the first connecting flange member ( 0b, 10c) and the pipe coupling assembly, characterized by being assembled so as firmly to fix the said first and second pipe (11, 12).

An outer end surface of the first connection flange member (10b) to which the first annular protrusion (16, 17) is fixed is larger than an inner diameter of the through hole (13a, 14a) and the first circle. An enlarged recess (13b, 14b) larger than the outer diameter of the annular protrusion (16, 17) is formed,
The pipe joint assembly according to claim 1, wherein the first annular protrusion (16, 17) is press-fitted and fixed to the enlarged recess (13b, 14b).

The first annular protrusion (16, 17) is fitted to the outer end surface of the first connection flange member (10c) to which the first annular protrusion (16, 17) is fixed. 2. The pipe joint assembly according to claim 1, wherein the pipe joint assembly is formed of a flat plate having no recess.

The pipe joint assembly according to any one of claims 1 to 3, wherein the bulge portion (18, 19) is formed as an annular projecting portion projecting radially outward. .

In the first connection flange member (10b, 10c) and the second connection flange member (10a), the through hole (13a, 14a) is connected to the short side of the connection flange member (10a, 10b, 10c). The pipe joint assembly according to any one of claims 1 to 4, wherein an opening (13c, 14c) that opens in the direction (B) is formed.

A straight pipe portion, a first annular projecting portion (16) formed on one end side of the straight pipe portion and projecting radially outward; and formed on the other end side of the straight pipe portion and radially outward. A first pipe (11) having a second annular protrusion (16) protruding;
A straight pipe part, a first annular projecting part (17) formed on one end side of the straight pipe part and projecting radially outward; and formed on the other end side of the straight pipe part and radially outward. A second pipe (12) having a protruding second annular protrusion (17);
The first and second pipes (11, 12) have through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are inserted, respectively. A first connecting flange member (10b) in which the annular protrusions (16, 17) are fixed to the outer end surface;
There are through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are inserted, respectively, and the second of the first and second pipes (11, 12). In a manufacturing method of a pipe joint assembly comprising a second connection flange member (10a) to which an annular protrusion (16, 17) is fixed to an outer end face,
Forming the through holes (13a, 14a) in the first and second connection flange members (10a, 10b);
On the outer end surface of the first connection flange member (10b), an enlarged recess (larger than the inner diameter of the through hole (13a, 14a) and larger than the outer diameter of the first annular protrusion (16, 17)). 13b, 14b),
On the outer end face of the second connection flange member (10a), an enlarged recess (larger than the inner diameter of the through hole (13a, 14a) and larger than the outer diameter of the second annular projection (16, 17)). 13b, 14b),
Press-fitting and fixing the first annular protrusion (16, 17) to the enlarged recess (13b, 14b) formed in the first connection flange member (10b);
In a pipe that is at least one of the first and second pipes (11, 12) and exceeds a predetermined pipe length (L0) , and the first annular protrusion (16, 17) On the inner side of the first connection flange member (10b) on the opposite side, close to the end face of the first connection flange member (10b, 10c), a bulge portion (18, 19), the pipe length of the pipe is shortened by forming the bulges (18, 19) , and the pair of the first and second pipes (11, 12) combined with each other have a predetermined same length. And the first connecting flange member (10b, 10c) between the bulging portion (18, 19) and the first annular protrusion (16, 17). ) Sandwiching the first connecting flange member (10b, And assembly Ru steps to firmly fix the 0c) and said first and second pipe (11, 12),
And a step of press-fitting and fixing the second annular protrusions (16, 17) into the enlarged recesses (13b, 14b) formed in the second connection flange member (10a). A method for manufacturing a joint assembly.

A straight pipe portion, a first annular projecting portion (16) formed on one end side of the straight pipe portion and projecting radially outward; and formed on the other end side of the straight pipe portion and radially outward. A first pipe (11) having a second annular protrusion (16) protruding;
A straight pipe part, a first annular projecting part (17) formed on one end side of the straight pipe part and projecting radially outward; and formed on the other end side of the straight pipe part and radially outward. A second pipe (12) having a protruding second annular protrusion (17);
The first and second pipes (11, 12) have through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are inserted, respectively. A first connection flange member (10c) in which the annular protrusions (16, 17) are fixed to the outer end face;
There are through holes (13a, 14a) into which the straight pipe portions of the first and second pipes (11, 12) are inserted, respectively, and the second of the first and second pipes (11, 12). In a manufacturing method of a pipe joint assembly comprising a second connection flange member (10a) to which an annular protrusion (16, 17) is fixed to an outer end face,
Forming the through holes (13a, 14a) in the first and second connection flange members (10a, 10c);
On the outer end face of the second connection flange member (10a), an enlarged recess (larger than the inner diameter of the through hole (13a, 14a) and larger than the outer diameter of the second annular projection (16, 17)). 13b, 14b),
In the first and second pipes (11, 12) exceeding a predetermined pipe length (L0), the first pipe is on the opposite side to the first annular protrusion (16, 17). On the inner side of the connection flange member (10c), bulge portions (18, 19) for expanding the outer diameter of the pipe are formed in the vicinity of the end surface of the first connection flange member (10c). The first and second pipes (11, 12) are fixed to the first connection flange member (10c) by forming (18, 19), and the first and second pipes (11, 12). The axial length of the pair of the first and second pipes (11, 12) combined so as to be a predetermined same length (L0) , and The bulge (18, 19) and the first annular protrusion The first connection flange member (10b, 10c) is sandwiched between the first connection flange member (10b, 10c) and the first and second pipes (11, 12). and assembling Ru steps to firmly fixed,
And a step of press-fitting and fixing the second annular protrusions (16, 17) into the enlarged recesses (13b, 14b) formed in the second connection flange member (10a). A method for manufacturing a joint assembly.