JPH0510555B2 - - Google Patents
Info
- Publication number
- JPH0510555B2 JPH0510555B2 JP59087545A JP8754584A JPH0510555B2 JP H0510555 B2 JPH0510555 B2 JP H0510555B2 JP 59087545 A JP59087545 A JP 59087545A JP 8754584 A JP8754584 A JP 8754584A JP H0510555 B2 JPH0510555 B2 JP H0510555B2
- Authority
- JP
- Japan
- Prior art keywords
- straight pipe
- branch
- cross
- pipe
- upstream
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000011144 upstream manufacturing Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 2
- 239000002826 coolant Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000009835 boiling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は、例えば沸騰水型原子炉の再循環系に
介装されているヘツダのようなクロス配管構造に
関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cross piping structure such as a header installed in a recirculation system of a boiling water nuclear reactor, for example.
［発明の技術的背景］
第２図は一般的な沸騰水型原子炉の概略を示す
ものであり、原子炉圧力容器１内には上下方向に
おける中央位置よりやや下方に炉心２が形成され
ている。この炉心２の上方には気水分離器３が配
設されており、この気水分離器３により分離され
た蒸気は管路４によりタービン（図示せず）に供
給されるようになつている。また、図示しないタ
ービンからの蒸気凝縮水が管路６から原子炉圧力
容器１内に戻されるようになつている。さらに原
子炉圧力容器１内に管路６により給水がなされる
ようになつている。[Technical Background of the Invention] Fig. 2 schematically shows a general boiling water reactor, in which a reactor core 2 is formed in a reactor pressure vessel 1 slightly below the center position in the vertical direction. There is. A steam separator 3 is disposed above the core 2, and the steam separated by the steam separator 3 is supplied to a turbine (not shown) through a pipe 4. . Further, steam condensed water from a turbine (not shown) is returned into the reactor pressure vessel 1 through a pipe 6. Furthermore, water is supplied into the reactor pressure vessel 1 through a pipe line 6.
前記原子炉圧力容器１内には炉心２を囲繞する
ように複数個のジエツトポンプ７が配設されてお
り、原子炉圧力容器１内の冷却材を炉心２を通過
するように循環せしめるようになつている。この
ため、原子炉圧力容器１外には、この容器１内の
冷却材をジエツトポンプ７に供給するための一対
の再循環系８が配設されており各再循環系８には
再循環ポンプ９が介装され、この再循環ポンプ９
の下流側には冷却材を各ジエツトポンプ７に分配
するためのヘツダ１０が設けられている。 A plurality of jet pumps 7 are arranged in the reactor pressure vessel 1 so as to surround the reactor core 2, and are configured to circulate the coolant in the reactor pressure vessel 1 so as to pass through the reactor core 2. ing. For this reason, a pair of recirculation systems 8 are provided outside the reactor pressure vessel 1 for supplying the coolant in this vessel 1 to the jet pump 7, and each recirculation system 8 has a recirculation pump 9. is interposed, and this recirculation pump 9
A header 10 for distributing coolant to each jet pump 7 is provided downstream of the jet pump 7 .
前記ヘツダ１０は、第３図および第４図に示す
ように円筒形の上流側直管１１を有し、この直管
１１の軸方向同一位置には直管１１より小径の口
径からなる一対の第１および第２の分岐管１２
Ａ，１２Ｂが接続され、直管１１内にはクロス部
１６が形成されている。そして、両分岐管１２
Ａ，１２Ｂの直管１１に対する接続位置は一方の
分岐管１２Ａが他方の分岐管１２Ｂの軸線に対し
直管１１の円周方向にずれるようになされてい
る。すなわち、第４図に詳示するように、両分岐
管１２Ａ，１２Ｂの軸線LA，LBは直管１１の直
径線Ｌに対し同方向に角度αだけずれるように接
続されている。 The header 10 has a cylindrical upstream straight pipe 11 as shown in FIGS. 3 and 4, and a pair of cylindrical upstream straight pipes 11 having a diameter smaller than that of the straight pipes 11 are located at the same position in the axial direction of the straight pipe 11. First and second branch pipes 12
A and 12B are connected, and a cross section 16 is formed within the straight pipe 11. And both branch pipes 12
The connection positions of A and 12B to the straight pipe 11 are such that one branch pipe 12A is offset in the circumferential direction of the straight pipe 11 with respect to the axis of the other branch pipe 12B. That is, as shown in detail in FIG. 4, the axes L A and L B of both branch pipes 12A and 12B are connected to the diameter line L of the straight pipe 11 so as to be deviated from each other by an angle α in the same direction.
前記直管１１は下端を入口部１３とされ、冷却
材は下方から上方に流れるようになつており、こ
の直管１１における分岐管１２Ａ，１２Ｂの接続
部位より下流側の出口部１４はレデユーサ１５に
より口径が漸減され、下流側直管１７が接続され
ている。 The lower end of the straight pipe 11 is used as an inlet part 13, and the coolant flows from the bottom to the top.The outlet part 14 of the straight pipe 11 on the downstream side of the connecting part of the branch pipes 12A and 12B is a reducer 15. The diameter of the pipe is gradually reduced, and a straight pipe 17 on the downstream side is connected.
［背景技術の問題点］
前述したヘツダ１０のようなクロス配管構造に
おいては、第５図Ａ，Ｂ，Ｃに示すように、入口
部１３、および両分岐管１２Ａ，１２Ｂが直管１
１と交差するクロス部１６における冷却材の偏流
ａによりクロス部１６から分岐管１２Ａ，１２Ｂ
にかけて冷却材の旋回流ｂが生じる。また、この
旋回流ｂは、上流および下流における冷却材の流
れの乱れにより第５図Ｄに示すように分岐管１２
Ａ，１２Ｂの直下位置の偏流ｃに変化し、旋回流
がなくなる状態になる。[Problems with the Background Art] In a cross piping structure such as the header 10 described above, as shown in FIGS.
The branch pipes 12A, 12B are separated from the cross part 16 by the uneven flow a of the coolant in the cross part 16 that intersects with the cross part 1.
A swirling flow b of the coolant is generated throughout the period. Moreover, this swirling flow b is caused by the turbulence of the coolant flow in the upstream and downstream areas, as shown in FIG.
The current changes to a polarized flow c directly below A and 12B, and the swirling flow disappears.
したがつて、このようなクロス配管構造におい
ては、旋回流ｂの有無が不規則に繰返えされるの
で、分岐管１２Ａ，１２Ｂ内における冷却材の流
れが大幅に変動し、安定した分岐流量を得ること
ができないという問題点があつた。 Therefore, in such a cross piping structure, the presence and absence of the swirling flow b is irregularly repeated, so the flow of coolant in the branch pipes 12A and 12B fluctuates significantly, making it difficult to maintain a stable branch flow rate. The problem was that I couldn't get it.
［発明の目的］
本発明は、このような点に鑑み、分岐管内にお
ける旋回流の有無の変動をなくして安定した分岐
流量を得ることのできるクロス配管構造を提供す
ることを目的とする。[Object of the Invention] In view of the above points, an object of the present invention is to provide a cross piping structure that can eliminate fluctuations in the presence or absence of swirling flow in the branch pipe and obtain a stable branch flow rate.
［発明の概要］
本発明に係るクロス配管構造は、直管と、この
直管の軸方向同一位置に接続された一対の分岐管
とを有し、一方の分岐管は他方の分岐管の軸線に
対し直管の円周方向にずれた位置に接続されてい
るクロス配管構造において、液体が下方から上方
に沿つて流れる上流側直管と、この上流側直管の
下流側に直接接続された該上流側直管より小口径
の下流側直管と、前記上流側直管にその軸線とほ
ぼ直角方向にクロス部を有して分岐され該上流側
直管より小口径の第１および第２の分岐管と、前
記クロス部内面でかつ前記第１および第２の分岐
管の分岐部下端より下流側でかつこの分岐管の分
岐部上端上流側に形成され前記第１および第２の
分岐管の軸線と直角方向に縮径した絞り部とを具
備したことを特徴とする。[Summary of the Invention] A cross piping structure according to the present invention has a straight pipe and a pair of branch pipes connected to the same position in the axial direction of the straight pipe, one branch pipe being connected to the axis of the other branch pipe. In a cross piping structure, the straight pipe is connected at a circumferentially offset position, with the upstream straight pipe through which liquid flows from below to the top, and the upstream straight pipe connected directly to the downstream side of this upstream straight pipe. a downstream straight pipe having a smaller diameter than the upstream straight pipe; and first and second first and second pipes having a smaller diameter than the upstream straight pipe and branched from the upstream straight pipe by having a cross section in a direction substantially perpendicular to its axis. and the first and second branch pipes formed on the inner surface of the cross portion, downstream from the lower ends of the branch of the first and second branch pipes, and upstream of the upper ends of the branch parts of the branch pipes. It is characterized by comprising a constricted part whose diameter is reduced in a direction perpendicular to the axis of the valve.
［発明の実施例］
以下、本発明を図面に示す実施例により説明す
る。なお、前述した従来のものと同一の構成につ
いては、図面中に同一の符号を付し、その説明は
省略する。[Embodiments of the Invention] The present invention will be described below with reference to embodiments shown in the drawings. Note that the same components as those of the conventional device described above are denoted by the same reference numerals in the drawings, and the explanation thereof will be omitted.
第１図、第６図、第７図および第８図は本発明
の第１の実施例を示すものであり、クロス配管構
造の一例としてのヘツダ２０における出口部１４
の直管２１の内径は第１図および第７図に示すよ
うにクロス部１６内の中心軸線Lxから下流側が、
入口部１３の上流側直管１１の内径より縮径して
小口径になつた絞り部２４が形成されている。ま
た、この出口部１４の下流側直管２１は入口部１
３の上流側直管１１の中心線と同芯となつてい
る。 1, 6, 7, and 8 show a first embodiment of the present invention, and show an outlet portion 14 in a header 20 as an example of a cross piping structure.
The inner diameter of the straight pipe 21 is as shown in FIGS. 1 and 7 on the downstream side from the central axis L x in the cross section 16.
A constricted portion 24 having a smaller diameter than the inner diameter of the upstream straight pipe 11 of the inlet portion 13 is formed. Further, the straight pipe 21 on the downstream side of the outlet section 14 is connected to the inlet section 1.
It is concentric with the center line of the upstream straight pipe 11 of No. 3.
このような構造にすると第７図および第８図に
示すようにクロス部１６の中心軸線Lx部に沿つ
て上流側直管１１内で、第１図および第２図の分
岐管１２Ａ，１２Ｂの軸線LA，LBの外側にフラ
ツト面２２が形成される。このフラツト面２２か
ら上方を絞り部２４と称す。 With such a structure, as shown in FIGS. 7 and 8, the branch pipes 12A and 12B of FIGS . A flat surface 22 is formed outside the axes LA and LB. The portion above the flat surface 22 is called a constricted portion 24.
前述した構成によれば、上流側直管１１の入口
部１３から導入された冷却材は中心部では絞り部
２４から出口部１４の下流側直管２１内を流れ、
下流側直管２１の内径より外側の流れはフラツト
面２２および、クロス部分岐管上面２３Ａ，２３
Ｂに衝突し、分岐管１２Ａ，１２Ｂに導入され
る。そして、この分岐管１２Ａ，１２Ｂに導入さ
れる冷却材の流れは出口部１４方向へ流れる冷却
材の干渉を受けないので、分岐管１２Ａ，１２Ｂ
内において旋回流が生じることはない。 According to the above-described configuration, the coolant introduced from the inlet portion 13 of the upstream straight pipe 11 flows from the throttle portion 24 at the center inside the downstream straight pipe 21 of the outlet portion 14,
The flow outside the inner diameter of the downstream straight pipe 21 flows through the flat surface 22 and the cross section branch pipe upper surfaces 23A, 23.
B and is introduced into branch pipes 12A and 12B. Since the flow of the coolant introduced into the branch pipes 12A, 12B is not interfered with by the coolant flowing in the direction of the outlet section 14, the branch pipes 12A, 12B
There is no swirling flow inside.
したがつて分岐管内に旋回流が生じず分岐流量
は安定し、したがつて分岐流量の制御を簡単に行
なうことができるという効果を奏する。 Therefore, no swirling flow occurs in the branch pipe, and the branch flow rate is stabilized, so that the branch flow rate can be easily controlled.
第９図は本発明の第２の実施例を示すものであ
り、出口部１４にテーパー部２６を設け、このク
ロス部１６から上方の下流側直管２１と上部配管
２７との間の流動をさらになめらかにし、かつ第
７図のフラツト面２２を削除して側面をなめらか
な曲面に形成し、流動をよりスムーズにする形状
の絞り部２７が形成されている。 FIG. 9 shows a second embodiment of the present invention, in which a tapered part 26 is provided at the outlet part 14 to prevent the flow between the downstream straight pipe 21 and the upper pipe 27 located above the cross part 16. Further, the flat surface 22 shown in FIG. 7 is removed to form a smooth curved side surface, and a constricted portion 27 is formed to make the flow smoother.
また第１０図は前記第２の実施例の概念を立体
的に示したものである。 Further, FIG. 10 shows the concept of the second embodiment in three dimensions.
このような構成によつても前述した第１の実施
例と同様の作用効果を奏することができる。 Even with such a configuration, the same effects as those of the first embodiment described above can be achieved.
次に、第５図を用いて従来例での流動状況を第
１図、第６図から第７図を用いて本発明の一実施
例での流動状況を述べる。 Next, the flow situation in the conventional example will be described using FIG. 5, and the flow situation in an embodiment of the present invention will be described using FIG. 1 and FIGS. 6 to 7.
まず、第５図Ａで上流側直管入口部１３（区間
）から流れて来た水はクロス部１６（区間）
で分岐管１２Ａ，１２Ｂと下流側直管１７の出口
部１４（区間）に分かれる。 First, in Fig. 5A, the water flowing from the upstream straight pipe inlet section 13 (section) is transferred to the cross section 16 (section).
It is divided into branch pipes 12A, 12B and an outlet section 14 (section) of the downstream straight pipe 17.
このとき、出口部１４に流れ込む水量は、入口
部１３（区間）を流れる両の1/3以下になる。 At this time, the amount of water flowing into the outlet section 14 is less than 1/3 of the amount of water flowing through the inlet section 13 (section).
この場合、第４図ＡまたはＢで示す様な従来例
では、出口部直管２１の内径が入口部１３の内径
と同じになつているために、一様な流速分布をも
つピストンフローで流れる場合にはこの出口部直
管２１での流速はクロス部１６の入口部１３流速
に比べ1/3以下にならなければならない。 In this case, in the conventional example shown in FIG. 4A or B, the inner diameter of the outlet straight pipe 21 is the same as the inner diameter of the inlet section 13, so the flow is a piston flow with a uniform flow velocity distribution. In this case, the flow velocity at the outlet straight pipe 21 must be 1/3 or less compared to the flow velocity at the inlet 13 of the cross section 16.
しかし実際には、流体の慣性によつてあまり減
速されずにこの出口部直管２１に水が入つて来る
為に、この区間の部分で逆流する成分が生じ、
第５図Ｂに示す様に旋回流が生じる。 However, in reality, water enters this outlet straight pipe 21 without being slowed down much due to the inertia of the fluid, so a component that flows backward occurs in this section.
A swirling flow is generated as shown in FIG. 5B.
またこの旋回流は第５図Ｃに示す様に分岐管１
２Ａ，１２Ｂの取付け角度が傾いていることや、
上流側の流れの乱れ成分などにより時々消滅し、
その時に流動変動が生じる。 Also, this swirling flow is caused by the branch pipe 1 as shown in Fig. 5C.
The installation angle of 2A and 12B is tilted,
Sometimes it disappears due to turbulence components in the upstream flow,
At that time, flow fluctuations occur.
次に第１図、第６図から第８図に示す様な本発
明の一実施例では第１図に示す様に入口部１３の
管壁に沿つた流れはクロス部１６で絞り部２４が
形成されかつ出口部１４が狭くなつている為に第
１および第２の分岐管１２Ａ，１２Ｂへスムーズ
に流れる。 Next, in one embodiment of the present invention as shown in FIGS. 1, 6 to 8, the flow along the pipe wall of the inlet section 13 is controlled by the cross section 16 and the constriction section 24. Since the outlet portion 14 is narrow, it flows smoothly into the first and second branch pipes 12A and 12B.
すなわち、第７図から明らかなようにクロス部
１６中央にフラツト面２２による絞り部２４が形
成されているため、入口部１３の管壁に沿つた流
れは、フラツト面２２に衝突して図に示す様に分
岐管１２Ａ，１２Ｂに流れ込む。また、第１１図
に示した曲面の絞り部２７によつても同様の流動
状態が得られる。 In other words, as is clear from FIG. 7, since a constriction section 24 is formed by the flat surface 22 at the center of the cross section 16, the flow along the tube wall of the inlet section 13 collides with the flat surface 22 and is distorted as shown in the figure. As shown, it flows into branch pipes 12A and 12B. Further, a similar flow state can be obtained by the curved constriction portion 27 shown in FIG.
従つて第５図に示した従来例の様に入口部１３
の管壁に沿つた流れで出口部１４配管へ流れ込む
流量は無くなり、かつクロス部１６中央から上部
配管が絞られている為に出口部１４配管へ流れ込
む水の流速は入口部１３から変化することなくス
ムーズに流れる。従つて旋回渦の無い安定した流
動が得られる。 Therefore, as in the conventional example shown in FIG.
The flow rate of water flowing into the outlet section 14 piping due to the flow along the pipe wall disappears, and since the upper piping is constricted from the center of the cross section 16, the flow rate of water flowing into the outlet section 14 piping changes from the inlet section 13. Flows smoothly. Therefore, stable flow without swirling vortices can be obtained.
［発明の効果］
以上説明したように、本発明に係るクロス配管
構造はこのクロス配管のクロス部内面に分岐管の
分岐部下端より下流側でかつこの分岐管の分岐部
上端より上流側に分岐管の軸線と直角方向に縮径
した絞り部を形成した事により分岐管内に旋回流
が生じず、分岐流量は安定し、従つて分岐流量の
制御を簡単に行なうことができるという効果を奏
する。[Effects of the Invention] As explained above, the cross piping structure according to the present invention has a branch on the inner surface of the cross portion of the cross piping downstream from the lower end of the branch of the branch pipe and upstream from the upper end of the branch portion of the branch pipe. By forming the constricted part whose diameter is reduced in the direction perpendicular to the axis of the pipe, swirling flow does not occur in the branch pipe, the branch flow rate is stabilized, and therefore the branch flow rate can be easily controlled.
なお、本発明が原子炉のヘツダ以外の種々のも
のにも適用できることはもちろんである。 It goes without saying that the present invention can also be applied to various things other than nuclear reactor headers.
第１図は本発明に係るクロス配管構造の一実施
例を示す縦断面図、第２図は一般的な沸騰水型原
子炉を示す縦断面図、第３図は従来のクロス配管
構造を示す斜視図、第４図は第３図の平面図、第
５図Ａ〜Ｄは第３図および第４図のクロス配管構
造の作用を示す図で、第５図Ａは正面図、第５図
ＢおよびＤは左側面図、第５図Ｃは平面図、第６
図から第８図は本発明に係るクロス配管構造の第
１の実施例を説明するための図で、第６図は第１
図のＡ−Ａ矢視断面図、第７図は第１図のＢ−Ｂ
矢視断面図、第８図は第１図を上流側から見た
図、第９図は本発明の第２の実施例を示す縦断面
図、第１０図は第９図を一部切欠して示す立体図
である。
１……原子炉圧力容器、２……炉心、７……ジ
エツトポンプ、８……再循環系、１０，２０……
ヘツダ、１１……上流側直管、１２Ａ，１２Ｂ…
…分岐管、１３……入口部、１４……出口部、１
６……クロス部、２１……下流側直管、２２……
フラツト面、２３Ａ，２３Ｂ……クロス部分岐
管、１２Ａ，１２Ｂ……上面、２４，２７……絞
り部、２５……径違い段部、２６……テーパ部。
Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the cross piping structure according to the present invention, Fig. 2 is a longitudinal cross-sectional view showing a general boiling water reactor, and Fig. 3 is a longitudinal cross-sectional view showing a conventional cross piping structure. 5 is a perspective view, FIG. 4 is a plan view of FIG. 3, FIGS. 5A to 5D are views showing the action of the cross piping structure of FIGS. B and D are left side views, Fig. 5 C is a plan view, Fig. 6
8 to 8 are diagrams for explaining the first embodiment of the cross piping structure according to the present invention, and FIG.
A cross-sectional view taken along the line A-A in the figure, and Figure 7 is a cross-sectional view taken along the line B-B in Figure 1.
8 is a view of FIG. 1 viewed from the upstream side, FIG. 9 is a longitudinal sectional view showing the second embodiment of the present invention, and FIG. 10 is a partially cutaway view of FIG. 9. FIG. 1... Reactor pressure vessel, 2... Reactor core, 7... Jet pump, 8... Recirculation system, 10, 20...
Header, 11... Upstream straight pipe, 12A, 12B...
... Branch pipe, 13 ... Inlet section, 14 ... Outlet section, 1
6...Cross part, 21...Downstream straight pipe, 22...
Flat surface, 23A, 23B... cross section branch pipe, 12A, 12B... upper surface, 24, 27... constricted part, 25... diameter step part, 26... taper part.
Claims (1)
管と、この上流側直管の下流側に直接接続された
該上流側直管より小口径の下流側直管と、前記上
流側直管にその軸線とほぼ直角方向にクロス部を
有して分岐され該上流側直管より小口径の第１お
よび第２の分岐管と、前記クロス部内面でかつ前
記第１および第２の分岐管の分岐部下端より下流
側でかつこの分岐管の分岐部上端より上流側に形
成され前記第１および第２の分岐管の軸線と直角
方向に縮径した絞り部とを具備したことを特徴と
するクロス配管構造。 ２ 絞り部はクロス部内で分岐管の軸線方向に沿
つてフラツト面が形成されたものからなることを
特徴とする特許請求の範囲第１項記載のクロス配
管構造。 ３ 絞り部はクロス部内面に下流側直管方向に沿
つて順次縮径された曲率面が形成されていること
を特徴とする特許請求の範囲第１項記載のクロス
配管構造。[Scope of Claims] 1. An upstream straight pipe through which liquid flows from below to above, and a downstream straight pipe having a smaller diameter than the upstream straight pipe and directly connected to the downstream side of the upstream straight pipe. first and second branch pipes having a cross section in a direction substantially perpendicular to the axis of the upstream straight pipe and having a smaller diameter than the upstream straight pipe; A constricted part is formed downstream of the lower end of the branch of the second branch pipe and upstream of the upper end of the branch part of the branch pipe, and has a reduced diameter in a direction perpendicular to the axes of the first and second branch pipes. Cross piping structure characterized by 2. The cross piping structure according to claim 1, wherein the constricted portion has a flat surface formed within the cross portion along the axial direction of the branch pipe. 3. The cross piping structure according to claim 1, wherein the throttle portion has a curvature surface whose diameter is gradually reduced along the downstream straight pipe direction on the inner surface of the cross portion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59087545A JPS61274196A (en) | 1984-04-28 | 1984-04-28 | Cross piping structure |
| US06/709,207 US4708372A (en) | 1984-04-28 | 1985-03-07 | Cross piping construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59087545A JPS61274196A (en) | 1984-04-28 | 1984-04-28 | Cross piping structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61274196A JPS61274196A (en) | 1986-12-04 |
| JPH0510555B2 true JPH0510555B2 (en) | 1993-02-10 |
Family
ID=13917950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59087545A Granted JPS61274196A (en) | 1984-04-28 | 1984-04-28 | Cross piping structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61274196A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59220685A (en) * | 1983-05-30 | 1984-12-12 | 株式会社日立製作所 | Pipeline for recirculation circulation of reactor |
-
1984
- 1984-04-28 JP JP59087545A patent/JPS61274196A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59220685A (en) * | 1983-05-30 | 1984-12-12 | 株式会社日立製作所 | Pipeline for recirculation circulation of reactor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61274196A (en) | 1986-12-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |