JPH03292487A - Silencing structure in double piping for fluid pipe - Google Patents
Silencing structure in double piping for fluid pipeInfo
- Publication number
- JPH03292487A JPH03292487A JP2092902A JP9290290A JPH03292487A JP H03292487 A JPH03292487 A JP H03292487A JP 2092902 A JP2092902 A JP 2092902A JP 9290290 A JP9290290 A JP 9290290A JP H03292487 A JPH03292487 A JP H03292487A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- fluid
- fluid pipe
- sheath
- water
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims description 69
- 230000030279 gene silencing Effects 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims description 35
- 239000002356 single layer Substances 0.000 claims 1
- 239000004033 plastic Substances 0.000 abstract description 6
- 229920003023 plastic Polymers 0.000 abstract description 6
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- -1 polyethylene Polymers 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Thermal Insulation (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Domestic Plumbing Installations (AREA)
- Pipe Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、建築物内の暖房、給湯等の水まわりの施工に
用いられる流体管の二重配管における消音構造に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sound-dampening structure for double piping of fluid pipes used for construction around water such as heating and hot water supply in buildings.
(従来の技術)
近時、建築物内の暖房、給湯等の水まわりの施工には第
7図に示すように、給湯器(10)等の供給部(^)と
給水栓(20)等の使用部(B)とをフレキシブルな流
体管(R)でつなぐとともに、その流体管(R)を可撓
性を有する鞘管(S)内に挿通して壁裏(C)等に配管
する、いわゆる鞘管工法が普及してきている。かかる工
法は、壁裏(C)の自由な配管ができるため、それ以前
に行なわれていた金属管による配管方法に比べて施工手
間がかからず、また、流体管(R)の更新が容易である
等メンテナンスが簡単に行なえるというメリットを有し
ている。(Prior Art) Recently, as shown in Figure 7, in the construction of water-related areas such as heating and hot water supply in buildings, a supply section (^) such as a water heater (10), a water tap (20), etc. are used. Connect the used part (B) with a flexible fluid pipe (R), and insert the fluid pipe (R) into a flexible sheath pipe (S) and connect it to the back of the wall (C), etc. The so-called sheath pipe construction method is becoming popular. This construction method allows for free piping behind the wall (C), so it requires less construction work than the previous piping method using metal pipes, and it is also easier to update the fluid pipe (R). It has the advantage of easy maintenance.
(発明か解決しようとする課題)
しかしながら、水まわり配管においては、給水栓を使用
する際に弁を閉じて水の流れを急に止めたりすると給水
栓付近の管内を圧力が急増し、その戻りによって水が管
の内壁に衝突し、音が発生するウォーターハンマー現象
を生じる。(Problem to be solved by the invention) However, in water piping, when the valve is closed to suddenly stop the flow of water when using a hydrant, the pressure in the pipe near the hydrant increases rapidly, and the pressure returns. This causes water to collide with the inner wall of the pipe, creating a water hammer phenomenon that produces sound.
上記鞘管工法では、このようなウォーターハンマー現象
により発生した音に対しては、流体管(R)が鞘管(S
)内に保護されているため、鞘管(S)による防音効果
によって、その音を消すことがてきていた。In the above-mentioned sheath pipe construction method, the fluid pipe (R) is replaced by the sheath pipe (S
), the sound has been muffled by the soundproofing effect of the sheath tube (S).
しかしながら、このような鞘管工法では、第8図に示す
ように、流体管(R)はフレキシブルなものであるため
、管内の水の流れが急に止まった場合にウォーターハン
マー現象とともに流体管(R)が波うった状態を生じ、
これが鞘管(S)の内壁に衝突して、流体管(R)と鞘
管(S)とて大きな衝突音が発生するという新たな問題
が生じた。However, in such a sheath pipe construction method, as shown in Figure 8, the fluid pipe (R) is flexible, so if the flow of water in the pipe suddenly stops, water hammer phenomenon occurs and the fluid pipe (R) R) causes an undulating state,
A new problem arose in that this collided with the inner wall of the sheath tube (S), causing a loud collision sound between the fluid tube (R) and the sheath tube (S).
かかる衝突音は主として配管の曲り部分において流体管
(R)が鞘管(S)の内壁とこすれ合うようにして発生
し、ウォーターハンマーのように鞘管(S)による防音
効果では防ぐことがてきない、そして、このような衝突
音は給水栓を使用する人に不快感を与えたり、また流体
管(R)の損傷を招いたりする。Such collision noise is mainly generated when the fluid pipe (R) rubs against the inner wall of the sheath pipe (S) at the curved portion of the pipe, and cannot be prevented by the soundproofing effect of the sheath pipe (S) like water hammer. No, and such collision noise may cause discomfort to the person using the water faucet, and may also cause damage to the fluid pipe (R).
本発明はこのような事情に鑑みなされたものであり、可
撓性を有する鞘管内に湯、水等の流体を通すフレキシブ
ルな流体管が挿通された二重の配管構造をもつた流体管
の配管において、鞘管内で発生する音の発生を完全に消
すための消音構造を提供しようとするものである。The present invention was made in view of these circumstances, and provides a fluid pipe with a double piping structure in which a flexible fluid pipe for passing fluids such as hot water and water is inserted into a flexible sheath pipe. The purpose of this invention is to provide a noise-absorbing structure that completely eliminates the sound generated within the sheath pipe in piping.
(課題を解決するための手段)
すなわち、本発明に係る流体管の配管における消音構造
は「可撓性を有する鞘管内に湯、水等の流体を通すフレ
キシブルな流体管が挿通された流体管の配管における流
体管と鞘管との衝突音を消音するための消音構造であっ
て、流体管と鞘管との間に形成される空間に緩衝材を介
在させて成る1ことを特徴としている。(Means for Solving the Problems) In other words, the noise reduction structure in the fluid pipe piping according to the present invention is a fluid pipe in which a flexible fluid pipe for passing fluid such as hot water or water is inserted into a flexible sheath pipe. A noise-absorbing structure for muffling the collision sound between a fluid pipe and a sheath pipe in piping, characterized in that a buffer material is interposed in the space formed between the fluid pipe and the sheath pipe. .
(作用)
このような消音構造にあっては、管内の水の流れが急に
止まって管内を圧力が急増し、その戻りによって水が管
の内壁に衝突して発生するウォーターハンマー現象によ
る音の発生を防ぐとともに、管内の水の流れが急に止ま
るて流体管が波うち状態となるのを緩衝材か防ぎ、流体
管と鞘管との衝突音が発生するのを防止し、音の発生を
完全になくすことができるようになっている。(Function) With this type of noise reduction structure, the flow of water inside the pipe suddenly stops, the pressure inside the pipe increases rapidly, and the water returns and collides with the inner wall of the pipe, causing the sound to be suppressed due to the water hammer phenomenon. In addition to preventing the occurrence of sound, the cushioning material also prevents the fluid pipe from becoming undulating due to the sudden stop of the flow of water in the pipe, and prevents the sound of collision between the fluid pipe and the sheath pipe. can now be completely eliminated.
(実施例)
以下、図面に示す実施例にしたがって、本発明を説明す
る。(Example) Hereinafter, the present invention will be described according to an example shown in the drawings.
第1図及び第2図は本発明の一実施例を示し、第3図及
び第4図は本発明の別の実施例を示し、第5図及び第6
図は本発明のさらに別の実施例を示している。1 and 2 show one embodiment of the invention, FIGS. 3 and 4 show another embodiment of the invention, and FIGS.
The figure shows a further embodiment of the invention.
これら実施例において、流体管(R)はポリエチレン等
のプラスチックによって作製されている。In these embodiments, the fluid tube (R) is made of plastic such as polyethylene.
また、鞘管(S)はプラスチックによりて作製され可撓
性を有するものとなっている。Further, the sheath tube (S) is made of plastic and has flexibility.
緩衝材(1)はゴム、スポンジ、軟質プラスチック等に
よって作製されている。緩衝材(1)は弾力性があり復
元力に富むものが好ましい。また、鞘管(S)内への挿
入をスムーズにするため、表面が滑らかであることが好
ましい。The cushioning material (1) is made of rubber, sponge, soft plastic, or the like. The cushioning material (1) is preferably elastic and has a high restoring force. Further, in order to facilitate insertion into the sheath tube (S), it is preferable that the surface is smooth.
第1図及び第2図に示す実施例は、流体管(R)と、鞘
管(S)と、流体管(R)の外周に巻き付けられ、鞘管
(S)内に収納されるようになっているシート状の緩衝
材(1)とからなつている。The embodiment shown in FIGS. 1 and 2 includes a fluid pipe (R), a sheath pipe (S), and a structure that is wrapped around the outer circumference of the fluid pipe (R) and housed in the sheath pipe (S). It consists of a sheet-like cushioning material (1).
この実施例については、第1図に示すように。For this embodiment, as shown in FIG.
流体管(R)の外周に緩衝材(1)を巻き付けながら鞘
管(S)内に流体管(R)を挿入して行くことにより、
流体管(R)と鞘管(S)との間の空間に緩衝材(1)
を介在させた消音構造を採ることができるようになって
いる。By inserting the fluid pipe (R) into the sheath pipe (S) while wrapping the buffer material (1) around the outer periphery of the fluid pipe (R),
A buffer material (1) is placed in the space between the fluid pipe (R) and the sheath pipe (S).
It is now possible to adopt a sound-muffling structure with intervening.
なお、第1図及び第2図に示す実施例において鞘管(S
)内に流体管(R)とともに緩衝材(1)を挿入して行
く場合、緩衝材(1)の先端をテープ等を用いて流体管
(R)に固定しておけば1、流体管(R)とともに緩衝
材(1)を鞘管(S)内にスムーズに送り込むことがで
きる。また、流体管(R)の挿入時に流体管(R)の外
周に緩衝材(1)を巻き付けながら行なう場合に限らず
、予め流体管(R)の外周に緩衝材(1)を巻き付けて
固着したものを、鞘管(S)内に送り込むようにしても
よい。In addition, in the embodiment shown in FIGS. 1 and 2, the sheath tube (S
) When inserting the buffer material (1) together with the fluid pipe (R) into the fluid pipe (R), fix the tip of the buffer material (1) to the fluid pipe (R) using tape or the like. The cushioning material (1) can be smoothly fed into the sheath tube (S) together with R). In addition, when inserting the fluid pipe (R), it is not limited to wrapping the buffer material (1) around the outer periphery of the fluid pipe (R), but it is also possible to wrap the buffer material (1) around the outer periphery of the fluid pipe (R) in advance and secure it. It is also possible to feed the material into the sheath tube (S).
第3図及び第4図に示す実施例は、流体管(R)と、鞘
管(S)と、予め流体管(R)の外周に巻き付く形態に
加工され、鞘管(S)内に収納される略筒状の緩衝材(
1)とからなっている。In the embodiment shown in FIGS. 3 and 4, a fluid pipe (R) and a sheath pipe (S) are processed in advance to wrap around the outer periphery of the fluid pipe (R), and are wrapped inside the sheath pipe (S). A roughly cylindrical cushioning material (
It consists of 1).
この実施例については、第3図に示すように、略筒状の
緩衝材(1)の切れ目部分を開いて流体管(R)にかぶ
せ、鞘管(S)内に流体管(R)を挿入して行くことに
より、第4図に示すように、流体管(R)と鞘管(S)
との間の空間に緩衝材(1)を介在させた消音構造を採
ることができるようになっている。In this embodiment, as shown in Fig. 3, the cut portion of the substantially cylindrical buffer material (1) is opened and the fluid pipe (R) is covered with the fluid pipe (R), and the fluid pipe (R) is inserted into the sheath pipe (S). By inserting the fluid tube (R) and sheath tube (S) as shown in Figure 4,
It is now possible to adopt a sound-dampening structure in which a cushioning material (1) is interposed in the space between the two.
この第3図及び第4図に示す実施例の場合には、流体管
(R)に緩衝材(1)をかぶせてやれば、流体管(R)
の外周に巻き付くので、そのまま鞘管(S)内へ簡単に
挿入して行くことができる。なお、第1図及び第2図に
示す実施例と同様に、緩衝材(1)の先端をテープ等を
用いて流体管(R)に固定しておいてもよい、また、予
め流体管(R)の外周に緩衝材(1)をかぶせたものを
固着して、鞘管(S)内に送り込むようにしてもよい。In the case of the embodiment shown in FIGS. 3 and 4, if the fluid pipe (R) is covered with the buffer material (1), the fluid pipe (R)
Since it wraps around the outer periphery of the tube, it can be easily inserted into the sheath tube (S) as it is. Note that, similar to the embodiment shown in FIGS. 1 and 2, the tip of the cushioning material (1) may be fixed to the fluid pipe (R) using tape or the like; It is also possible to securely cover the outer periphery of the tube R) with a cushioning material (1) and feed it into the sheath tube (S).
第5図及び第6図に示す実施例は、流体管(R)と、鞘
管(S)と、付着によって流体管(R)の外周に巻き付
けられ、鞘管(S)内に収納される緩衝材(1)とから
なっている。The embodiment shown in FIGS. 5 and 6 includes a fluid pipe (R) and a sheath pipe (S), which are wrapped around the outer circumference of the fluid pipe (R) by adhesion and housed in the sheath pipe (S). It consists of a cushioning material (1).
この実施例については、第5図に示すように、流体管(
R)の適宜箇所に緩衝材(1)をはりつけながら鞘管(
S)内に流体管(R)を挿入して行くか。For this example, as shown in FIG.
While attaching the cushioning material (1) to the appropriate places on the sheath tube (R),
Should I insert the fluid tube (R) into S)?
あるいは、予め流体管(R)の適宜箇所に緩衝材(1)
がはりつけられたものを鞘管(S)内に挿入して行くこ
とにより、第6図に示すように、流体管(R)と鞘管(
S)との間の空間に緩衝材(1)を介在させた消音構造
を採ることができるようになっている。Alternatively, place the buffer material (1) in advance at an appropriate location on the fluid pipe (R).
As shown in Figure 6, the fluid tube (R) and the sheath tube (S) are inserted into the sheath tube (S).
It is now possible to adopt a sound-dampening structure in which a cushioning material (1) is interposed in the space between S).
なお、緩衝材(1)を流体管(R)に付着するには、配
管時に流体管(R)の外面に接着剤を塗布して接着する
場合であっても、緩衝材(1)の内面に予め接着剤が塗
布され、離型紙の貼られたものを配管時にはがして流体
管(R)にはりつける場合であってもよい。In addition, in order to attach the buffer material (1) to the fluid pipe (R), even if adhesive is applied to the outer surface of the fluid pipe (R) during piping, the inner surface of the buffer material (1) must be adhered. An adhesive may be applied to the tube in advance, and a release paper attached thereto may be peeled off at the time of piping and attached to the fluid pipe (R).
この実施例の場合には、緩衝材(1)の使用を少なくし
てコストの低減を図ることができる。また流体管(R)
の抵抗を小さくすることができる。In the case of this embodiment, it is possible to reduce the use of the cushioning material (1), thereby reducing costs. Also, fluid pipe (R)
resistance can be reduced.
なお、この実施例における緩衝材(1)の形態は、第1
図に示す緩衝材(1)のようにシート状であっても、第
3図に示す緩衝材(1)のように予め流体管(R)の外
周に巻き付く形態に加工されたものであってもよい。Note that the form of the cushioning material (1) in this example is the first
Even if it is in sheet form like the cushioning material (1) shown in the figure, it is not one that has been processed in advance to wrap around the outer periphery of the fluid pipe (R) like the cushioning material (1) shown in Fig. 3. It's okay.
本発明にあっては、緩衝材(1)の形態は上記のような
実施例のものに限らず、流体管(R)と鞘管(S)との
間に形成される空間に緩衝材(1)を介在させることが
できる形態であればよい。In the present invention, the form of the buffer material (1) is not limited to that of the embodiments described above, and the buffer material (1) is provided in the space formed between the fluid pipe (R) and the sheath pipe (S). 1) may be used as long as it can intervene.
(発明の効果)
以上1本発明にあっては、流体管と鞘管との間に形成さ
れる空間に緩衝材を介在させることにより、管内の水の
流れが急に止まって流体管が波うち状態となって流体管
と鞘管との衝突音が発生するのを有効に防止することが
できる。したがって、管内の水の流れが急に止まって管
内を圧力が急増し、その戻りによって水が管の内壁に衝
突して発生するウォーターハンマー現象による音の発生
を防ぐことは勿論のこと、管内の水の流れが急に止まっ
て流体管が波うち状態となるのを緩衝材が防ぎ、流体管
と鞘管との衝突音が発生するのを防止し、音の発生を完
全になくすことができる。(Effects of the Invention) According to the first aspect of the present invention, by interposing a buffer material in the space formed between the fluid pipe and the sheath pipe, the flow of water in the pipe suddenly stops, causing the fluid pipe to wave. It is possible to effectively prevent collision noise between the fluid pipe and the sheath pipe from occurring due to this state. Therefore, it goes without saying that the flow of water in the pipe suddenly stops, the pressure inside the pipe increases rapidly, and the return of the water causes the water to collide with the inner wall of the pipe, preventing the sound caused by the water hammer phenomenon. The buffer material prevents the fluid pipe from waving when the water flow suddenly stops, and prevents the sound of collision between the fluid pipe and sheath pipe, completely eliminating the sound. .
これにより、給水栓を使用する人に衝突音による不快感
を与えることもない。また、流体管が鞘管に衝突するこ
とによる損傷をひき起こすこともない。Thereby, the collision noise does not cause discomfort to the person using the water faucet. Further, damage caused by the fluid tube colliding with the sheath tube does not occur.
第1図及び第2図は本発明の一実施例を示し、第1図は
その斜視図、第2図はその横断面図、第3図及び第4図
は本発明の別の実施例を示し、第3図はその斜視図、第
4図はその横断面図、第5図及び第6図は本発明のさら
に別の実施例を示し、第5図はその斜視図、第6図はそ
の縦断面図、第7図は鞘管工法による流体管の配管構造
を示す側面図、第8図は鞘管内の流体管の動きを説明す
るための縦断面図である。
符号の説明
1・・・緩衝材1 and 2 show one embodiment of the present invention, FIG. 1 is a perspective view thereof, FIG. 2 is a cross-sectional view thereof, and FIGS. 3 and 4 show another embodiment of the present invention. FIG. 3 is a perspective view thereof, FIG. 4 is a cross-sectional view thereof, and FIGS. 5 and 6 show further embodiments of the present invention, FIG. 5 is a perspective view thereof, and FIG. FIG. 7 is a side view showing the piping structure of the fluid pipe by the sheath pipe construction method, and FIG. 8 is a longitudinal cross-sectional view for explaining the movement of the fluid pipe within the sheath pipe. Explanation of code 1...Cushioning material
Claims (1)
シブルな流体管を挿通して配管する流体管の一重配管に
おけてウォーターハンマー現象とともに発生する流体管
と鞘管との衝突音を消音するための消音構造であって、 流体管と鞘管との間に形成される空間に緩衝材を介在さ
せて成ることを特徴とする流体管の二重配管における消
音構造。[Scope of Claims] Fluid pipes and fluid pipes that occur along with the water hammer phenomenon in single-layer fluid piping in which a flexible fluid pipe for passing fluid such as hot water or water is inserted into a flexible sheath pipe. A sound-absorbing structure for muffling the sound of collision with a sheath pipe, characterized in that a buffer material is interposed in a space formed between the fluid pipe and the sheath pipe, in a double piping of a fluid pipe. Sound deadening structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2092902A JP2534155B2 (en) | 1990-04-06 | 1990-04-06 | Assembling method of sound deadening structure in double pipe of fluid pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2092902A JP2534155B2 (en) | 1990-04-06 | 1990-04-06 | Assembling method of sound deadening structure in double pipe of fluid pipe |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7304315A Division JP2934722B2 (en) | 1995-11-22 | 1995-11-22 | Silence structure in double piping of fluid pipe |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03292487A true JPH03292487A (en) | 1991-12-24 |
JP2534155B2 JP2534155B2 (en) | 1996-09-11 |
Family
ID=14067407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2092902A Expired - Lifetime JP2534155B2 (en) | 1990-04-06 | 1990-04-06 | Assembling method of sound deadening structure in double pipe of fluid pipe |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2534155B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0577363U (en) * | 1992-03-19 | 1993-10-22 | スミヨシ化成株式会社 | Free-standing shower hose for vanity |
JPH0634066U (en) * | 1992-10-05 | 1994-05-06 | 三菱油化産資株式会社 | Plastic pipe for double piping |
JPH06297623A (en) * | 1993-04-19 | 1994-10-25 | Nippon Petrochem Co Ltd | Composite sheet for coating of piping and method for sound insulation of resin piping by using the sheet |
US5435871A (en) * | 1992-02-12 | 1995-07-25 | Sofanou S.A. | Process for producing tubular sheath sound insulation for electric cables |
WO2017213007A1 (en) * | 2016-06-09 | 2017-12-14 | 株式会社ブリヂストン | Compound tube |
JP2021028531A (en) * | 2019-08-13 | 2021-02-25 | 未来工業株式会社 | Corrugated double pipe and water conduction pipe device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0391596U (en) * | 1989-12-28 | 1991-09-18 |
-
1990
- 1990-04-06 JP JP2092902A patent/JP2534155B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0391596U (en) * | 1989-12-28 | 1991-09-18 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5435871A (en) * | 1992-02-12 | 1995-07-25 | Sofanou S.A. | Process for producing tubular sheath sound insulation for electric cables |
JPH0577363U (en) * | 1992-03-19 | 1993-10-22 | スミヨシ化成株式会社 | Free-standing shower hose for vanity |
JPH0634066U (en) * | 1992-10-05 | 1994-05-06 | 三菱油化産資株式会社 | Plastic pipe for double piping |
JPH06297623A (en) * | 1993-04-19 | 1994-10-25 | Nippon Petrochem Co Ltd | Composite sheet for coating of piping and method for sound insulation of resin piping by using the sheet |
WO2017213007A1 (en) * | 2016-06-09 | 2017-12-14 | 株式会社ブリヂストン | Compound tube |
JPWO2017213007A1 (en) * | 2016-06-09 | 2019-04-11 | 株式会社ブリヂストン | Compound pipe |
JP2021028531A (en) * | 2019-08-13 | 2021-02-25 | 未来工業株式会社 | Corrugated double pipe and water conduction pipe device |
Also Published As
Publication number | Publication date |
---|---|
JP2534155B2 (en) | 1996-09-11 |
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