Nippon Pillar Packing Co., Ltd.

Yutaka Okamoto

Kiyoshi Nishio

Makoto Fujii

Takuya Ishida

Tatsuya Fujii

A tube includes a casing made of a fluororesin. The casing surrounds a fluid tube and lid members, each made of a fluororesin and include a receiving portion for receiving one end portion of the tube. At least one sealing face is disposed in the receiving portion. Union nuts, made of a fluororesin, are fitted onto the end portion of the tube and screwed to one end portion of one of the lid members. A sealing portion is formed by fastening the union nuts to the end portions of the lid members to press the tube from the outside of the tube. A device element such as a filter member is placed in the casing.

Tube device, and piping system including the tube device

A tubeincludes a casingmade of a fluororesin. The casingsurrounds a fluid tubeand lid memberseach made of a fluororesin and include a receiving portionfor receiving one end portion of the tube. At least one sealing faceis disposed in the receiving portion. Union nuts, made of a fluororesin, are fitted onto the end portion of the tubeand screwed to one end portion of one of the lid members. A sealing portionis formed by fastening the union nutsto the end portions of the lid membersto press the tubefrom the outside of the tube. A device element such as a filter memberis placed in the casing

A synthetic resin-made fastening-limiting device employed for limiting a fastening force of a fastening member in case of fastening a connection portion between a pipe receiving port of the joint and a pipe by means of the fastening member. In the fastening-limiting device, an appropriate sealing property of the pipe connection portion and a screw amount of the fastening member required in trying to preventing the pipe from slipping off can be surely determined. Furthermore, the operator can recognize easily the appropriate screw amount of the fastening member by a sound and a touch. This fastening-limiting device has a ring portion fittable onto the pipe receiving port of the joint A and a protrusion disposed on the ring portion. On a side of one end in an axial direction of the ring portion, a first abutting portion is formed. On a side of the other end in an axial direction of the ring portion, a second abutting portion is formed. A gap a between the first abutting portion and the second abutting portion is equal to a distance between a reference face and a confronting portion in a state wherein the fastening member exhibits functions such as sealing property and prevention of slipping-off. On either side of the protrusion, recessed portions and are formed, and projections are disposed on a side of the joint.

Synthetic resin-made fastening-limiting device for a joint fastening member

The present invention relates to a heat exchanger applied for an IC production line or the like, wherein, on plural independent tube holding holes,formed on holding plates,ends of resin tubes are arranged, and a predetermined length range &agr; of the each resin tube is integrally fused into the each holding plate inside the tube holding holes. Each fusing portion for fusing the plural resin tubes into the holding plates has a non-contacted congestion structure wherein the resin tubes are not mutually contacted, thereby increasing reliability on connecting the fusing portion, and meanwhile, facilitating miniaturization of the heat exchanger by increasing heat-exchange efficiency and elements such as the resin tubes and the holding plates may be made of a fluororesin.

Heat exchanger and a method of producing the same

The present invention relates to a fastening-limiting device for a fastening member which fastens a pipe inserted into a pipe receiving port on the side of a joint. The fastening-limiting device has a ring portion which is fittable onto the outside of the pipe receiving port. A beam portion is formed on the ring portion. A protrusion is formed on the beam portion. A first abutting portion which is to abut against a reference face on the side of the joint is formed on one end of the ring portion. A second abutting portion which is to abut against a confronting portion of the fastening member is formed on the other end of the ring portion. A gap between the first and second abutting portions and is equal to the gap between the reference face and the confronting portion at the time when the fastening member exerts a sealing property and a function of preventing slipping-off. According to the present invention, when an appropriate sealing property of the pipe connection portion and prevention of slipping-off of the pipe are to be attained, the screw amount of the fastening member can be appropriately determined without dispersion.

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Sanda, Japan

Yutaka Okamoto