JP3055965U - Flexible tube connecting device and flexible tube connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fluid conduction of a nipple connected to a bellows-shaped flexible tube to another tube without applying any deformation processing to the tip of the bellows-shaped flexible tube. The connection structure of the watertight flexible tube is obtained by inserting it into the opening of the hole and performing an efficient operation without complexity. SOLUTION: A nipple 2 connected to another pipe 3 or an end of the device, a cap nut 4 screwed to the nipple 2,
The only flat packing 5 whose inner peripheral edge portion 5a fits tightly into the valley groove 1b of the distal end portion 1a of the bellows-like flexible tube 1 and whose side edge can contact the distal end surface 2b of the nipple 2, and the inner peripheral edge 6a Is fitted in the valley groove 1c of the bellows-shaped flexible tube 1 and is housed in the bottom of the cap nut 4 so as to press the side wall of the flat packing 5 by tightening the cap nut 4. The connection structure of the flexible tube 1 is configured.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to a connector for a bellows-like flexible tube (flexible tube) in a fluid pipe and a connection structure for the flexible tube using the connector.

[0002]

[Prior art]

 Conventionally, a bellows-shaped flexible pipe made of stainless steel has been frequently used for piping around water such as a hot water supply apparatus, a solar system, and hand washing. Conventionally, a structure as shown in FIG. 3 has been known as a means for connecting a bellows-shaped flexible pipe to another pipe. That is, several folds at the tip 31a of the bellows-like flexible tube 31 made of stainless steel are crushed to form a flange 31b, and the front end of the flange 31b is attached to the end of another pipe 32. The flange 31b of the flexible tube 31 is pressed against the nipple 33 by pressing against the end face 33a of the nipple 33 via the packing 34 and screwing the cap nut 35 to the nipple 33 from the rear side of the flange 31b. It is a joint structure that is sandwiched and connected between 35 in a watertight manner. However, in order to adopt this connection means, a dedicated flange-forming tool for forming the flange portion 31b is required, and there is a problem that the work at the piping work site is troublesome and the work efficiency is reduced. In addition, since the watertight structure of the connecting portion is simple, special attention must be paid to the watertight surface during the connection work. Also, every time the diameter of the flexible tube 31 is slightly different, the forming and connection work of the flange portion 31b are required. Must be examined.

[0003]

[Problems to be solved by the invention]

 In view of the above-mentioned conventional difficulties, the present invention is directed to a nipple connected to the end of another pipe or apparatus through which fluid can pass without performing any deformation processing on the tip itself of the bellows-shaped flexible pipe. An extremely simple and extremely simple structure with a simple and efficient operation that simply faces the tip of the flexible tube to the opening of the fluid passage hole and screws the cap nut onto the nipple. The purpose of the present invention is to obtain a flexible pipe connection structure that can be used for many ordinary applications that do not require an extremely high water density.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a nipple connected to an end of a pipe or a device through which a fluid passes, a cap nut detachably screwed to the nipple, and a bellows-shaped flexible pipe. The only flat packing that fits tightly in the valley groove of the nipple and whose side edge can contact the tip surface of the nipple, the inner peripheral edge fits in the valley groove of the bellows-shaped flexible tube, A connector for a flexible tube is constituted by a retaining ring which is housed at the bottom and presses the side edge of the flat packing against the tip end surface of the nipple by fastening the cap nut.

[0005] Further, using this flexible pipe connector, the tip of the bellows-shaped flexible pipe is inserted into the inside of the cap nut from the hole at the bottom of the cap nut, and is inserted into the valley groove at the tip. Fit the flat packing tightly, and insert the tip of the bellows-shaped flexible pipe into the fluid passage hole of the nipple connected to the end of the pipe or equipment through which the fluid passes, and nip the side edge of the flat packing. A stopper ring that fits the valley groove of the bellows-shaped flexible tube between the flat packing and the bottom of the cap nut, and tightens the cap nut to the nipple. Then, the side edge of the flat packing is tightly pressed against the distal end surface of the nipple via the retaining ring to obtain a connection structure for a flexible tube.

[0006]

[Embodiment of the invention]

 An embodiment of a flexible tube fitting according to the invention consists of a nipple connected to the end of a tube or device through which a fluid passes, a cap nut removably screwed onto the nipple, and a bellows-like connector. The only flat packing that fits tightly in the valley groove at the tip of the flexible tube and whose side edge can contact the front end face of the nipple, and the inner peripheral edge fits in the valley groove of the bellows-shaped flexible tube And a retaining ring which is housed at the bottom of the cap nut and presses the side edge of the flat packing against the tip end surface of the nipple by tightening the cap nut.

Further, in the embodiment of the flexible tube connecting structure based on the present invention, the tip of the bellows-shaped flexible tube is inserted into the inside of the cap nut through the hole at the bottom of the cap nut. Insert the tip of the bellows-shaped flexible tube into the fluid passage of the nipple connected to the end of the pipe or the pipe through which fluid passes, by fitting the single flat packing tightly into the groove of the part. The side edge of the only flat packing is brought into contact with the tip end surface of the nipple, and the retaining ring is fitted to the valley groove of the bellows-shaped flexible tube. It is arranged between the bottoms, and the cap nut is fastened to the nipple, and the side edge of the flat packing is pressed tightly to the tip end face of the nipple via the retaining ring.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 is a bellows-like flexible tube made of stainless steel, 2 is another tubing 3 through which a fluid such as water or gas passes, or a nip connected to an end of equipment such as a water heater, a solar system, or a hand washing water tank. 4 is a cap nut detachably screwed to the nipple 2, 5 is a flat packing of an elastic material such as rubber or resin, and 6 is a metal retaining ring made of metal such as brass. The ring 8 is not necessarily limited to metal, and may be made of, for example, resin. The flat packing 5 fits tightly into the valley groove 1b of the distal end portion 1a of the bellows-shaped flexible tube 1 and its side edge can contact the distal end surface 2b of the nipple 2. The inner peripheral edge 6a of the retaining ring 6 protrudes so as to fit into the valley groove 1c of the bellows-shaped flexible tube 1, and its side edge 6b has a shape that comes into close contact with the side edge of the flat packing 5. ing. The nipple 2, the cap nut 4, the flat packing 5, and the retaining ring 6 form a set to form a flexible pipe connector.

[0009] Furthermore, the tip 1a of the bellows-shaped flexible tube 1 is inserted into the inside of the bag nut 4 from the hole 4a at the bottom of the bag nut 4, and the flat packing 5 is tightly inserted into the valley groove 1b of the tip 1a. To be fitted. In this state, the distal end portion 1a of the flexible tube 1 is inserted into the fluid conducting hole 2a of the nipple 2, and one side edge of the flat packing 5 is brought into contact with the distal end surface 2b of the nipple 2, and further divided into two parts. The retaining ring 6 is disposed on the outer periphery of the flexible tube 1 between the bottom of the cap nut 4 and the flat packing 5, and the inner peripheral edge 6 a of the retaining ring 6 is formed in the groove of the flexible tube 1. When the cap nut 4 is fastened to the nipple 2 with the side edge 6b of the retaining ring 6 being in contact with the other side edge of the flat packing 5, the retaining ring 6 and the tip of the nipple 2 are fitted. The flat packing 5 is tightly sandwiched between the portions 2b, and the inner peripheral edge 5a of the flat packing 5 has a tip 2b of the nipple 2, a valley groove 1b of the tip 1a of the flexible tube 1, and a retaining ring. 6. The gap between each of 6 is sealed to complete the connection structure of the flexible tube. In which water-tightness is maintained at the connecting portion I.

[0010] Some bellows-like flexible tubes of this type have a slightly different outer diameter (for example, those having a diameter of 16 mm and a diameter of 16.8 mm are often used), but such a difference in outer diameter is large. Is absorbed by the flat packing 5, so that a bellows-shaped flexible tube of any specification can be connected with the same connecting tool. If the outer diameter of the flexible tube is further different, the inner and outer diameters of the flat packing 5 can be changed to match the outer diameter of the bellows-shaped flexible tube. It can be used widely for flexible pipes.

The above embodiment is an example of a connection structure of a stainless steel bellows-shaped flexible tube having high watertightness, but a relatively hard rubber or resin found in horticultural tools / equipment and various liquid feeding equipment / equipment. It can also be applied as a connecting tool and a connecting structure for a bellows-shaped flexible tube made of steel.

[0012]

[Effect of the invention]

 As is evident from the above embodiment, according to the connecting device and the connecting structure for a flexible tube of the present invention, it is not necessary to apply a flange portion or other forming process to the distal end portion of the bellows-like flexible tube. With the flat packing 5 fitted in the valley groove at the tip of the bellows-shaped flexible tube, the tip is inserted into the fluid conducting hole of the nipple and the cap nut is simply screwed to the nipple. The connection of the bellows-like flexible tube can be performed. Therefore, the work at the construction site is easy and efficient without the need for special dedicated tools, and the retention of the bellows-like flexible tube is strengthened by the interposition of the retaining ring. Even if the outer diameter of the bellows-shaped flexible tube is slightly different, it can be handled with the same flat packing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a connector and a connection structure of a flexible tube showing one embodiment of the present invention.

FIG. 2 is a perspective view of a flat packing and a retaining ring in the connection tool and the connection structure.

FIG. 3 is a longitudinal sectional view of a conventional flexible tube connection structure.

[Explanation of symbols]

 1: bellows-shaped flexible tube 1a: tip of bellows-shaped flexible tube 1b: trough groove of a bellows-shaped flexible tube 1c: trough groove of a bellows-shaped flexible tube 2: nipple 2a: Nipple fluid conduction hole 2b: Tip surface of nipple 3: Other piping 4: Cap nut 4a: Hole at bottom of cap nut 5: Flat packing 5a: Inner peripheral edge of flat packing 6: Retaining split ring 6a: Retaining ring Inner peripheral edge of split ring 6b: Side edge of retaining split ring

Claims (2)

[Utility model registration claims] 1. A nipple connected to an end of a pipe or apparatus through which fluid passes, a cap nut detachably screwed to the nipple, and a valley groove at the tip of a bellows-shaped flexible pipe. The only flat packing that fits and whose side edge can contact the tip surface of the nipple, and the inner peripheral edge fits into the valley groove of a bellows-like flexible tube and is stored in the bottom of the cap nut and the bag A flexible tube connector comprising a pair of a retaining split ring for pressing a side edge of the flat packing against a distal end surface of the nipple by tightening a nut. 2. Inserting the tip of a bellows-shaped flexible tube through the hole at the bottom of the cap nut into the cap nut, and fitting the sole flat packing tightly into the groove at the tip, Insert the tip of the bellows-shaped flexible tube into the fluid passage hole of the nipple connected to the end of the pipe or equipment through which fluid passes, and abut the side edge of the single flat packing against the tip face of the nipple And a retaining ring with an inner peripheral edge fitted into the groove of the bellows-shaped flexible tube is disposed between the flat packing and the bottom of the cap nut, and the cap nut is fastened to the nipple. A flexible pipe connecting structure, wherein a side edge of the flat packing is pressed tightly against a front end surface of the nipple via the retaining ring.