JP3606732B2

JP3606732B2 - Branch joint for refrigerant pipe

Info

Publication number: JP3606732B2
Application number: JP04088998A
Authority: JP
Inventors: 定治古田
Original assignee: ユニオン空調工業株式会社
Priority date: 1997-07-04
Filing date: 1998-02-24
Publication date: 2005-01-05
Anticipated expiration: 2018-02-24
Also published as: JPH1172189A

Description

【０００１】
【発明の属する技術分野】
この発明は、冷媒管用分岐継手に関する。
【０００２】
【従来の技術】
ビル等の空調設備は、通常、一台の室外機に多数台の室内機を冷媒管で分配接続することが行われる。
【０００３】
この分配接続の方式としては、図９に示すように、室外機１から出た冷媒主管２の室外機３に対応する位置に二又のライン分岐継手４を配設し、各室内機３に分配していく方式と、図１０に示すように、室外機１から出た冷媒主管２に、予め室外機３…３に対応する数の枝管５Ａ…５Ａを櫛の歯状に分岐させたヘッダ分岐継手５を配設し、ここから各室内機３に分配していく方式とがある。
【０００４】
もっとも、図９、図１０に示した接続方式は説明のため単純化したもので、実際上はこれらが適宜組み合わされ、複雑な配管構造とされる。
【０００５】
【発明が解決しようとする課題】
ところで、上記分岐継手のうち、図９に示したライン分岐の継手４は分流方向が冷媒の流れ方向に沿った方向となるので流れの抵抗が少なく、均等分流ができる利点を有するが、室内機の位置ごとに冷媒主管を切断し分岐管を介在させていく工事が必要となり、これに伴う種々の弊害が生じる問題があった。
【０００６】
即ち、冷媒管の内部を流れる流体は気相、液相の二種が混在し、しかも高圧となる場合も多い。
このため、分岐管の接続部分は高度な水密構造とする必要があり、受口挿口による接続の場合は、接続部の蝋付けが不可欠となる。
【０００７】
しかもこの蝋付け個所は室内機に対応する分岐管ごとの繰り返し作業となるので作業が煩雑になる問題があり、例えば図９に示す室内機３がＮ個あれば分岐管４の数およびその蝋付け個所はＮ−１個所となり、Ｎが多数になる大型ビルほど作業が煩雑となる問題があった。
【０００８】
また、配管は天井裏など狭い空間に設けられるので、蝋付け施工が非常に困難となる上、蝋付けには高熱火炎を使用するので火災の危険もある問題があった。
また、受口挿口による接続の場合、挿口の受口に対する挿入深さが従来はせいぜい管径の半分程度であったため、長大管の場合受口に挿口を差し込んだだけでは仮支持が不安定となり上述したような狭い場所での蝋付け作業がさらに困難となる問題があった。
【００１０】
この発明は、上記問題点を解決することを目的としてなされたものであり、受口に対する挿口の仮支持を容易にし多数の分岐管の接続が容易に行えるようにした冷媒管用分岐継手を提供することを目的としてなされたものである。
【００１１】
【課題を解決するための手段】
請求項１の冷媒管用分岐継手は、受口に対する挿口の接続挿入深さが、管外径の１．５倍以上とされ、前記受口奥方の拡開テーパ角が５〜３０°、さらに前記挿口の開口端外面の角部の内角が直角より小さい鋭角とされ、前記受口奥方の拡開テーパ部に挿口を挿入した時に開口端が食い込むように構成してなることを特徴とするものである。
【００１２】
即ち、一本の主管を必要な数に分岐させる場合の分岐継手の構造として受口に対する挿口の接続挿入深さを、深くすることで差し込むだけで仮支持でき、現場での蝋付け接続作業も容易となる。ここに、受口に対する挿口の接続挿入深さを、管外径より１．５倍以上とするのは、１．５倍より浅いと受口に挿口を挿入したとき、挿口がぐらつき、蝋付け時の仮支持が必要となるからである。なお、挿入深さの上限は特に限定しないが、あまり深くすると管の有効長が短くなるので適当な深さに止める。
【００１５】
また、前記受口奥方の拡開テーパ角を５〜３０°とすることで、挿口の開口端外面の角部を受口奥端に食い込ませて仮支持を安定させる。なお、前記テーパ角を３０°より大きくすると食い込み力が充分でなくなり垂直に近い配管の場合、挿口が自重により抜け落ちる場合がある。
【００１６】
また、５°より小さいと、受口奥端に挿口が食い込んで仮支持の状態から外すのが困難となる場合がある。従って、挿口開口端外面の角部の内角を直角より小さい鋭角とすることと相俟って、受口奥方の拡開テーパ角を５〜３０°とするのが仮支持を確実とするための好ましい範囲となる。
【００１７】
請求項２の冷媒管用分岐継手は、請求項１の冷媒管用分岐継手において、受口に対する挿口の接続挿入深さが、ＪＩＳ規格寸法の２ . ４〜３ . ７５倍とされてなることを特徴とするものである。
【００１８】
ＪＩＳ規格には、受口に対する挿口の接続挿入深さが規定されているが、この請求項２においてはその規格値よりも遥かに大きい値とすることにより、仮支持時における挿口のぐらつきを防止するのである。
【００１９】
【発明の実施の形態】
次に、この発明の一実施の形態を説明する。
図１は、この発明にかかる冷媒管用分岐継手の平面図、図２は図１に示した冷媒管用分岐継手の本体を構成する継手の説明平面図である。
【００２０】
この発明の冷媒管用分岐継手１０は、図２に示すように主管１１に対し流れ方向同一の二方向に枝管１２、１２を分岐させた二又分岐管１３と、主管１１に対し流れ方向同一の三方向に分岐する枝管１４、１４、１５を有した三又分岐管１６との組合せで構成され、図１に示すように各枝管１２、１４、１５の末端に前記主管１１を接続することにより分岐管１２〜１５の並列数が増加され、増加させた枝管１２〜１５の末端に室内機３への冷媒搬送管６が着脱自在に接続可能とされている。
【００２１】
なお、上記において二又分岐管１３の枝管１２、１２は主管１１を挟んで対称方向に分岐されている。
また、三又分岐管１６は、外側の枝管１４、１４が主管１１を挟んで対称方向に分岐され、中一本の枝管１５の管軸が前記枝管１４、１４のほぼ中心線上になるようにされている。
【００２２】
なお、上記において、各主管１１は分岐された枝管１２、１４、１５に接続可能とされ、これら枝管１２〜１５の末端は、図示のように管軸に対しほぼ直角方向に一直線に並ぶよう切り揃えておくことが好ましい。
【００２３】
また、二又分岐管１３および三又分岐管１６の分岐部１３Ａ、１６Ａは、図３に二又分岐管１３の例で示すように主管１１に等しい径を有しそこからテーパ状に拡径されたテーパ状短管であって、拡径側端部に枝管１２を配置しプレスにより圧壊して形成されたものなどが使用される。
【００２４】
なお、図３は分岐管の構造の一例を示したもので、別々の管をそれぞれ直接溶接して形成したものであっても良い。
いずれにせよ、二又分岐管１３および三又分岐管１６は工場生産的に生産され各接続部は漏洩防止の蝋付けが施されて形成されている。
【００２５】
また、分岐数は、図４に示すように二又分岐管１３と三又分岐管１６の組み合わせによって４分岐から２７分岐など多数の分岐数にすることができる。
そして、増加させた枝管１２〜１５の末端には密閉用栓１７が着脱自在に嵌合され、必要な枝管１２〜１５のみ選択的に使用可能とされている。
【００２６】
図５は冷媒管用分岐継手において断熱材を組み合わせた場合を示し、図５において冷媒管用分岐継手１０は、図１に示した冷媒管用分岐継手１０の根元主管１１の開口端と枝管１２〜１５の最終末端との挿口部１２Ｂ〜１５Ｂを除き全体を断熱材１８で被覆して構成されている。
【００２７】
この断熱材１８も図１に示した冷媒管用分岐継手と同様工場生産的に生産される。
【００２８】
このような管系の管路を接続する場合の分岐継手の構造が、受口１１Ａに対する挿口１２Ｂの接続挿入深さｓが、管外径ｄより１.５倍以上とされている。
【００２９】
また、受口１１Ａ奥方の拡開テーパ角θが５〜３０°、さらに前記挿口１２Ｂの開口端外面の角部１２Ｃの内角αが直角以下の角度とされている。
上記において受口に対する挿口の接続挿入深さを、管外径より１．５倍以上とするのは、受口１１Ａに挿口１２Ｂを挿入した時の仮支持を確実にするためであって、これより少ないと、挿入しただけでは挿口１２Ｂが受口１１Ａ内でぐらつき、現場での蝋付け作業等に困難をきたすことがあるためである。
【００３０】
また、挿口の接続挿入深さを、管外径より大きくすれば仮支持の点では良いが、あまり深くすると管の有効長が短くなって効率が悪くなる。
これらを勘案し好適な管径と挿入深さを実際に試験したところ表１の結果となった。この表１の寸法関係とすれば必要十分な仮支持ができる。
表１の対ＪＩＳ比より明らかなように、本発明の差込深さはＪＩＳ規格寸法の２．４〜３．７５倍とされている。
【表１】

【００３１】
また、この受口の内径と挿口の外径はできる限り小さな交差とされることが望ましい。
さらに、上記受口１１Ａ奥方の拡径部１１Ｂのテーパ角θが５〜３０°とされ、また挿口１２Ｂの開口端１２Ｃの角部の内角αが分図に拡大して示すように直角より小さい鋭角とされる。
【００３２】
上記テーパ角θ、及び内角αは、挿口１２Ｂを挿入したときに、挿口１２Ｂの開口端１２Ｃの角部を食い込ませて、ある程度の抜け出し防止力を発揮させるためで、３０°より大きいと、受口１１Ａ内で挿口１２Ｂがぐらつくことは無いが、挿口１２Ｂを上方へ向けて受口１１Ａに挿入して取り付けるような場合、自重で挿口が抜け落ちることがあり仮支持が必要となるからである。
【００３３】
また、挿口１２Ｂの開口端１２Ｃの角部の内角αを直角より小さくするのは、上記食い込みを確実に発揮させるためであって、内角αを直角より大きくすると食い込み力が不足する。
【００３４】
さらに、この内角αにより受口奥方の拡径部１１Ｂ内面に内方へ開放された溝１９が形成され、この溝１９が蝋付けの溶融金属２０の溜り部となるので、蝋付け部の信頼性が増す。
【００３５】
図７は、上記受口１２Ｂを成形するための型２１の側面図を示し、該型２１は冷媒管用分岐継手１０の成形材料となる銅管等の管１０Ａの開口端に挿入され、管開口を拡径する芯金２１Ａとこの芯金を支持する基部２１Ｂとからなる。
【００３６】
芯金２１Ａの先端部は受口１２Ｂ奥方の拡径部のテーパ角θを形成するテーパ面２１Ｂとされ、芯金２１Ａの基部２１Ｂ側端２１Ｃがさらにテーパ状に拡径され、受口１２Ｂの開口端がテーパ状に拡径されるようにされている。
【００３７】
このテーパ状の拡径により受口１２Ｂ内面と挿口１１Ａ外面の間に蝋付け材が流れ込みやすくでき、蝋付けの信頼性がさらに増す。
次に、上記実施の形態の使用状態を説明する。
【００３８】
図８に示すように室外機１の冷媒出口１Ａに冷媒管用分岐継手１０の主管１１を接続し、必要な数の分岐をし、これに必要な室内機３…３を接続していく。
この場合、冷媒管用分岐継手１０の枝管１２〜１５の先にさらにこの発明の冷媒管用分岐継手１０を接続し分岐を増加することもできる。
【００３９】
従って、主管から各室内機への複数の分岐はこの冷媒管用分岐継手の配設個所一個所でよく、まとめて施工が可能となる上、冷媒管用分岐継手の分岐部は、工場生産時に蝋付け等の溶接がされているので極めて気密性が高く、かつ製造時に耐圧試験、分流検査が可能であるため、現場施工による溶接不良に起因する漏洩事故が確実に防止される。
【００４０】
さらに、各分岐管の分岐部は流れ方向に沿う方向に分岐されているので流れの抵抗が少なく、このため各枝管の偏流がなく、末端に至るまで均等に冷媒を分配できる。
【００４１】
【発明の効果】
以上説明したようにこの発明の冷媒管用分岐継手は、受口に対する挿口の接続挿入深さが、管外径より１．５倍以上、具体的には従来のＪＩＳ規格に対し２．４〜３ . ７５倍とされ、さらに受口奥方の拡径部のテーパ角と挿口端面の内角との組み合わせにより、枝管に冷媒搬送管を接続する場合の仮支持が確実に行なえるようになり、この発明の冷媒管用分岐継手に対する分配管の接続作業が容易となり、また蝋付けの信頼性も増すなどの効果を有する。
【図面の簡単な説明】
【図１】請求項１の発明にかかる冷媒管用分岐継手の平面図である。
【図２】図１に示した冷媒管用分岐継手の本体を構成する継手の説明平面図である。
【図３】図１に示した冷媒管用分岐継手の一例を示す説明斜視図である。
【図４】請求項１の発明にかかる冷媒管用分岐継手の他の実施の形態を示す平面図である。
【図５】請求項２の発明にかかる冷媒管用分岐継手の平面図である。
【図６】請求項３の発明にかかる冷媒管用分岐継手の要部平面図である。
【図７】冷媒管用分岐継手の受口成形用型の側面図である。
【図８】冷媒管用分岐継手の使用状態説明図である。
【図９】従来の冷媒管用分岐継手の平面図である。
【図１０】他の従来の冷媒管用分岐継手の平面図である。
【符号の説明】
６冷媒搬送管
１０冷媒管用分岐継手
１１主管
１１Ａ受口
１１Ｂ拡径部
１２枝管
１２Ｂ挿口部
１２Ｃ挿口端面
１３二又分岐管
１３Ａ分岐部
１４外側の枝管
１５中一本の枝管
１６三又分岐管
１６Ａ分岐部
１７密閉用栓
１８断熱材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch joint for refrigerant pipes.
[0002]
[Prior art]
In an air conditioner such as a building, usually, a large number of indoor units are connected to one outdoor unit by refrigerant pipes.
[0003]
As shown in FIG. 9, the distribution connection method is such that a bifurcated line branch joint 4 is disposed at a position corresponding to the outdoor unit 3 of the refrigerant main pipe 2 coming out of the outdoor unit 1. As shown in FIG. 10, the branch pipes 5A... 5A corresponding to the outdoor units 3... 3 are branched into comb teeth in advance in the refrigerant main pipe 2 from the outdoor unit 1 as shown in FIG. There is a system in which a header branch joint 5 is provided and distributed to each indoor unit 3 from here.
[0004]
However, the connection methods shown in FIGS. 9 and 10 are simplified for the sake of explanation, and in practice, these are appropriately combined to form a complicated piping structure.
[0005]
[Problems to be solved by the invention]
By the way, among the above-mentioned branch joints, the line branch joint 4 shown in FIG. 9 has the advantage that the flow splitting direction is the direction along the refrigerant flow direction, so that the flow resistance is small and the uniform splitting is possible. Therefore, it is necessary to perform a work for cutting the refrigerant main pipe and interposing the branch pipe at each position, which causes various problems.
[0006]
That is, the fluid flowing in the refrigerant pipe is a mixture of two types of gas phase and liquid phase, and the pressure is often high.
For this reason, the connection part of a branch pipe needs to be made into an advanced watertight structure, and in the case of the connection by a receptacle insertion, brazing of a connection part becomes indispensable.
[0007]
Moreover, since this brazed portion is a repetitive operation for each branch pipe corresponding to the indoor unit, there is a problem that the operation becomes complicated. For example, if there are N indoor units 3 shown in FIG. There are N-1 attachment points, and there is a problem that work becomes more complicated in large buildings with a large number of N.
[0008]
In addition, since the piping is provided in a narrow space such as the back of the ceiling, it is very difficult to braze, and a high-heat flame is used for brazing, which may cause a fire.
In addition, in the case of connection by the insertion port, the insertion depth of the insertion port with respect to the insertion port has conventionally been about half of the tube diameter. There was a problem that the brazing operation in a narrow place as described above becomes more difficult because of instability.
[0010]
The present invention has been made in order to solve the above problems, a large number of refrigerant pipes branch joint was so that the connection is easy to branch pipes to facilitate the temporary support of the spigot relative to the socket It was made for the purpose of providing.
[0011]
[Means for Solving the Problems]
In the refrigerant pipe branch joint according to claim 1, the connection insertion depth of the insertion port with respect to the receiving port is 1.5 times or more of the outer diameter of the tube, the expansion taper angle at the back of the receiving port is 5 to 30 °, The inner angle of the corner of the outer surface of the opening end of the insertion port is an acute angle smaller than a right angle, and the opening end bites in when the insertion port is inserted into the expanding taper portion at the back of the receiving port. To do.
[0012]
In other words, as the structure of a branch joint when branching one main pipe to the required number, it can be temporarily supported by simply inserting the connection insertion depth of the insertion opening to the receiving opening, and brazing connection work in the field Is also easier. Here, the connection insertion depth of the insertion port with respect to the receiving port is set to 1.5 times or more than the outer diameter of the tube. When the insertion port is inserted into the receiving port when it is shallower than 1.5 times, the insertion port is wobbled. This is because temporary support at the time of brazing is required. The upper limit of the insertion depth is not particularly limited, but if the depth is too deep, the effective length of the tube is shortened, so that the insertion depth is limited to an appropriate depth.
[0015]
In addition, by setting the expansion taper angle at the back of the receiving port to 5 to 30 °, the corner portion of the outer surface of the opening end of the insertion port is bitten into the receiving port at the back end, thereby stabilizing temporary support. If the taper angle is larger than 30 °, the biting force is not sufficient, and in the case of a pipe that is nearly vertical, the insertion port may fall off due to its own weight .
[0016]
On the other hand, if the angle is smaller than 5 °, the insertion opening may bite into the back end of the receiving opening and it may be difficult to remove it from the temporarily supported state. Therefore, in combination with setting the inner angle of the corner portion of the outer surface of the insertion opening end to an acute angle smaller than a right angle, setting the expansion taper angle at the back of the receiving port to 5 to 30 ° ensures the temporary support. This is a preferable range.
[0017]
Refrigerant pipe branch connection according to claim 2, in the refrigerant pipe branch connection according to claim 1, connection insertion depth of the spigot relative to the socket is a JIS standard size from 2.4 to 3. That is 75 times comprising It is a feature.
[0018]
The JIS standard defines the connection insertion depth of the insertion opening with respect to the receiving opening. However, in this claim 2, by making the value much larger than the standard value, the wobbling of the insertion opening at the time of temporary support is achieved. Is prevented.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
FIG. 1 is a plan view of a branch joint for refrigerant pipe according to the present invention, and FIG. 2 is an explanatory plan view of a joint constituting the main body of the branch joint for refrigerant pipe shown in FIG.
[0020]
As shown in FIG. 2, the refrigerant pipe branch joint 10 of the present invention has a bifurcated branch pipe 13 in which

branch pipes

12, 12 are branched in two directions that are the same in the flow direction with respect to the main pipe 11, and the same flow direction in the main pipe 11. The three-way branch pipe 16 having

branch pipes

14, 14, 15 branching in three directions is connected to the main pipe 11 at the ends of the

branch pipes

12, 14, 15 as shown in FIG. As a result, the parallel number of the branch pipes 12 to 15 is increased, and the refrigerant transport pipe 6 to the indoor unit 3 can be detachably connected to the increased ends of the branch pipes 12 to 15.
[0021]
In the above description, the

branch pipes

12 and 12 of the bifurcated branch pipe 13 are branched in a symmetric direction across the main pipe 11.
In the trifurcated branch pipe 16, the

outer branch pipes

14 and 14 are branched in a symmetrical direction with the main pipe 11 in between, and the tube axis of one branch pipe 15 is substantially on the center line of the

branch pipes

14 and 14. It is supposed to be.
[0022]
In the above, each main pipe 11 can be connected to the

branched branch pipes

12, 14, and 15, and the ends of the branch pipes 12 to 15 are aligned in a direction substantially perpendicular to the pipe axis as shown in the figure. It is preferable to cut and align them.
[0023]
Further, the

branch portions

13A and 16A of the bifurcated branch pipe 13 and the trifurcated branch pipe 16 have the same diameter as the main pipe 11 as shown in the example of the bifurcated branch pipe 13 in FIG. A tapered short tube that is formed by disposing the branch tube 12 at the end on the enlarged diameter side and crushing it with a press is used.
[0024]
FIG. 3 shows an example of the structure of the branch pipe, which may be formed by directly welding different pipes.
In any case, the bifurcated branch pipe 13 and the trifurcated branch pipe 16 are produced in a factory production manner, and each connection portion is formed with brazing for preventing leakage.
[0025]
Further, as shown in FIG. 4, the number of branches can be made into a large number of branches such as 4 branches to 27 branches by the combination of the bifurcated branch pipe 13 and the trifurcated branch pipe 16.
And the sealing plug 17 is detachably fitted to the end of the increased branch pipes 12-15, and only the necessary branch pipes 12-15 can be selectively used.
[0026]
Figure 5 shows the case of combining the Oite thermal insulation branch connection refrigerant pipe, the refrigerant pipe branch connection 10 in FIG. 5, the opening end and the branch pipe 12 of the base main 11 of the refrigerant pipe branch connection 10 shown in FIG. 1 The whole is covered with the heat insulating material 18 except for the insertion portions 12B to 15B with the final ends of -15.
[0027]
The heat insulating member 18 also Ru produced similarly plant productive and branch fitting for refrigerant tube shown in FIG.
[0028]
In the structure of the branch joint in the case of connecting such a pipe line, the connection insertion depth s of the insertion port 12B with respect to the receiving port 11A is 1.5 times or more than the tube outer diameter d.
[0029]
Further, the expansion taper angle θ at the back of the receiving port 11A is 5 to 30 °, and the inner angle α of the corner 12C on the outer surface of the opening end of the insertion port 12B is an angle equal to or less than a right angle.
The reason why the connection insertion depth of the insertion port with respect to the receiving port is 1.5 times or more than the outer diameter of the tube is to ensure temporary support when the insertion port 12B is inserted into the receiving port 11A. If it is less than this, the insertion 12B may be wobbled in the receiving opening 11A by just being inserted, which may make it difficult to perform brazing work on site.
[0030]
Further, if the connection insertion depth of the insertion opening is made larger than the outer diameter of the tube, it is good in terms of temporary support, but if it is made too deep, the effective length of the tube is shortened and the efficiency is deteriorated.
Taking these into consideration, when a suitable tube diameter and insertion depth were actually tested, the results shown in Table 1 were obtained. Necessary and sufficient temporary support can be achieved with the dimensional relationships in Table 1.
As is clear from the JIS ratio in Table 1, the insertion depth of the present invention is 2.4 to 3.75 times the JIS standard size.
[Table 1]

[0031]
In addition, it is desirable that the inner diameter of the receiving port and the outer diameter of the insertion port be as small as possible.
Further, the taper angle θ of the enlarged diameter portion 11B at the back of the receiving port 11A is set to 5 to 30 °, and the inner angle α of the corner portion of the opening end 12C of the insertion port 12B is enlarged from a right angle as shown in the partial view. A small acute angle.
[0032]
When the insertion angle 12B is inserted, the taper angle θ and the inner angle α cause the corner of the opening end 12C of the insertion opening 12B to bite and exhibit a certain degree of pull-out prevention force. The insertion opening 12B does not wobble in the receiving opening 11A, but when the insertion opening 12B is inserted into the receiving opening 11A with the insertion opening 12B facing upward, the insertion opening may fall off due to its own weight, and temporary support is required. Because it becomes.
[0033]
The reason why the inner angle α of the corner portion of the opening end 12C of the insertion opening 12B is made smaller than a right angle is to ensure that the above bite is exerted. If the inner angle α is made larger than the right angle, the biting force is insufficient.
[0034]
Further, a groove 19 opened inward is formed on the inner surface of the enlarged diameter portion 11B at the back of the receiving port by the inner angle α, and this groove 19 becomes a reservoir for the brazed molten metal 20, so the reliability of the brazed portion Increases nature.
[0035]
FIG. 7 shows a side view of a mold 21 for molding the receiving port 12B. The mold 21 is inserted into an opening end of a pipe 10A such as a copper pipe used as a molding material for the refrigerant pipe branch joint 10 to open the pipe opening. It consists of a core metal 21A that expands the diameter of the core and a base portion 21B that supports the core metal.
[0036]
The distal end of the cored bar 21A is a tapered surface 21B that forms a taper angle θ of the enlarged diameter part at the back of the receiving port 12B. The diameter of the open end is increased in a tapered shape.
[0037]
This taper-shaped expansion allows the brazing material to easily flow between the inner surface of the receiving port 12B and the outer surface of the insertion port 11A, and the reliability of brazing is further increased.
Next, the use state of the above embodiment will be described.
[0038]
As shown in FIG. 8, the main pipe 11 of the refrigerant pipe branch joint 10 is connected to the refrigerant outlet 1A of the outdoor unit 1, the necessary number of branches are made, and the indoor units 3 ... 3 necessary for this are connected.
In this case, branching can be increased by further connecting the branch joint for refrigerant pipe 10 of the present invention to the ends of the branch pipes 12 to 15 of the branch joint for refrigerant pipe 10.
[0039]
Therefore, a plurality of branches from the main pipe to each indoor unit may be provided at one place where the refrigerant pipe branch joint is arranged, and the construction can be performed collectively, and the branch part of the refrigerant pipe branch joint is brazed at the time of factory production. Since it is welded, etc., it is extremely airtight and can withstand pressure tests and diversion inspections during manufacturing, so leakage accidents due to poor welding due to on-site construction are reliably prevented.
[0040]
Further, since the branch portion of each branch pipe is branched in the direction along the flow direction, there is little flow resistance, so that there is no drift in each branch pipe and the refrigerant can be evenly distributed to the end.
[0041]
【The invention's effect】
As described above, in the branch joint for refrigerant pipe of the present invention, the connection insertion depth of the insertion opening with respect to the receiving opening is 1.5 times or more than the outer diameter of the pipe, specifically 2.4 to the conventional JIS standard. 3. is 75 times, even by the combination of the internal angle of taper angle and spigot end surface of the socket deeper of the enlarged diameter portion, a temporary support when connecting a refrigerant conveying tube branch pipe becomes reliably performed so The connecting operation of the distribution pipe to the refrigerant pipe branch joint of the present invention is facilitated, and the brazing reliability is increased.
[Brief description of the drawings]
1 is a plan view of a refrigerant pipe branch joint according to the first aspect of the present invention;
FIG. 2 is an explanatory plan view of a joint constituting the main body of the refrigerant pipe branch joint shown in FIG. 1;
3 is an explanatory perspective view showing an example of a branch joint for refrigerant pipes shown in FIG. 1. FIG.
FIG. 4 is a plan view showing another embodiment of the refrigerant pipe branch joint according to the first aspect of the present invention;
5 is a plan view of a refrigerant pipe branch joint according to the invention of claim 2. FIG.
6 is a plan view of an essential part of a refrigerant pipe branch joint according to the invention of claim 3. FIG.
FIG. 7 is a side view of a receiving die for a refrigerant pipe branch joint.
FIG. 8 is an explanatory diagram of a use state of a branch joint for a refrigerant pipe.
FIG. 9 is a plan view of a conventional branch joint for refrigerant pipes.
FIG. 10 is a plan view of another conventional refrigerant pipe branch joint.
[Explanation of symbols]
6 Refrigerant conveyance pipe 10 Refrigerant pipe branch joint 11 Main pipe 11A Receiving port 11B Expanded part 12 Branch pipe 12B Insertion part 12C Insertion end face 13 Forked branch pipe 13A Branch part 14 Outside branch pipe 15 One branch pipe 16 Three-way branch pipe 16A Branch part 17 Sealing plug 18 Thermal insulation

Claims

The connection insertion depth of the insertion port with respect to the receiving port is 1.5 times or more of the tube outer diameter, the expansion taper angle at the back of the receiving port is 5 to 30 °, and the corner portion of the opening end outer surface of the insertion port The refrigerant pipe branch joint is characterized in that the inner angle of the pipe is an acute angle smaller than a right angle, and the opening end bites into the widened taper portion at the back of the receiving port.

In the branch fitting for coolant tube according to claim 1, connection insertion depth of the spigot relative to the socket is 2 JIS standard dimensions. 4 to 3.75 times the by refrigerant pipes branch joint, characterized by comprising.