JPH0419489A - Connection unit for piping - Google Patents

Abstract

PURPOSE:To disuse a field processing and improve operability by providing a tapered opening end on an inner peripheral surface of an outer tube through which an inner tube is inserted, screwing a fastening nut for press-fitting in the inner tube, and providing a biting sleeve between an outer peripheral surface of the inner tube and the opening end. CONSTITUTION:A connection unit for piping is made up of an outer tube 16 and an inner tube 26 slidably inserted therethrough, while a screw structural body 18 having an opening end 20 whose inner peripheral surface is tapered is provided on an opening edge of the outer tube 16. A fastening nut 22 is screwed in an outer peripheral surface of the opening end 20. A press-fitting part 24 of the fastening nut 22 is substantially agreed with an outer diameter of the inner tube 26, and a biting sleeve 27 is provided between the opening end 20 and the press-fitting part 24. By fastening, the biting sleeve 27 bites into an outer periperal surface of the inner tube 26 to obtain a perfect selability. A field processing is disused and operability is improved, accordingly.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to indoor sprinkler piping or electrical wiring,
Regarding connecting materials used for various types of piping such as water and gas equipment, we have made it possible to freely adjust the length during piping work, and we have made it easier to work by eliminating the need for any on-site processing to adjust the length, such as cutting the end of the pipe. The aim is to achieve significant improvement and also improve durability.

(Prior Art) Conventionally, when installing indoor sprinkler piping, for example, as shown in FIG. Connect the horizontal draw pipe 5, wire draw pipe 6, etc., and install the sprinkler with the tip facing the ceiling of the room.
Attachment of the head 7 is being carried out.

(Problem to be Solved by the Invention) However, in the attic of a building, there are many structures such as piping and beams for various electrical equipment, etc., which are intricately intertwined. must also become complicated in order to avoid the above obstacles.

As a result, the installation of the socket 2 depends on the deviation distance X between the center and the installation of the sprinkler head 7, and the height difference y between the elbow 4 attached to the main pipe and the above-mentioned sprinkler head 7. The length of the contraction pipe 6 is measured in advance and cut at the factory, and the threaded material is transported to the construction site and the end of the pipe may be cut in some cases during actual construction. screwing into the elbow 4 while making fine adjustments, and performing piping work with this in between, requiring considerable skill and inefficiency; therefore, the average daily work of one skilled worker It is said that the number of target parts to be processed is approximately 10 to 15 at most.

(Means for Solving the Problems) Therefore, the present invention solves the various difficulties in the conventional techniques described above, eliminates the need for skill in piping work, and significantly improves workability during construction. Specifically, the outer tube.

It consists of an inner tube that is inserted into the outer tube so as to be able to slide in the axial direction, and the opening edge of the outer tube has a bevel in which the inner peripheral surface is tapered so that the diameter gradually increases toward the tip. At the same time, a tightening nut having a pressure contact portion whose base end has an inner diameter approximately equal to the outer diameter of the inner tube is screwed into the outer circumferential surface of the groove, and the inner circumferential side of the nut with Si'hffs is screwed into the outer circumferential surface of the groove. The present invention relates to a piping connection unit in which a sleeve is disposed between the pressure contact part and the outer pipe groove part and is inserted into the outer circumferential surface of the inner pipe.

Further, the present invention comprises an outer tube and an inner tube inserted into the outer tube so as to be able to slide in the axial direction, and a threaded structure is attached to the opening edge of the outer tube, and A groove is formed in which the inner peripheral surface is tapered so that the diameter gradually increases toward the distal opening, and the outer peripheral surface of the groove has an inner diameter that is approximately equal to the outer diameter of the inner tube at the proximal end. A tightening nut having a pressure welding part is screwed in, and is located on the inner circumferential side of the tightening nut between the pressure welding part and a groove provided on the inner circumference of the threaded structure at the tip of the outer tube. The present invention also relates to a piping connection unit in which a biting sleeve is interposed on the outer peripheral surface of an inner pipe.

(Function) After connecting either end of the outer tube and inner tube that make up the connection unit by screwing through a connector such as an elbow, slide the other outer tube or inner tube an arbitrary amount in the axial direction. Then, the end thereof is connected by screwing into another connector such as an elbow, and the tightening nut is rotated toward the outer tube using a tightening tool such as a spanner.

As a result, the biting sleeve interposed on the inner circumferential side of the tightening nut is pressed toward the outer tube by the pressure contact part, and by further tightening, a part of the biting sleeve is attached to the opening edge of the outer tube itself or the threaded structure. While being reduced in diameter along the tapered groove formed on the inner circumferential side of the inner tube, the inner tube is pressed against the outer circumferential surface of the inner tube and then bitten to integrally fix the outer tube and the inner tube to each other.

(Example) The specific content of the present invention will be explained below based on the example shown in FIGS. 1 to 3.

In Figure 22, 1) is the main pipe, 15.15' is the pipe connection unit, and 14.28 is the pipe connection unit 15 used as a horizontal draw pipe, or the pipe connection unit 7) used as a contraction pipe. Elbows for joining each 15'
29 indicates a sprinkler head.

A piping connection unit 15 as a horizontal drawing pipe has one end screwed into the queen pipe 1) via a socket 12 and a nipple 13, and the other end of an elbow 14 screwed into the queen pipe 1).
Furthermore, the other end is screwed into another elbow 28 and attached.

Further, one end of a piping connecting unit 15' serving as a contraction pipe is screwed into the other end of the elbow 28, and a sprinkler nod 29 is attached to the opposite end of the connecting unit 15'.

Since the basic structures of the piping connecting units 15 and 15' are completely the same, for convenience of explanation, the piping connecting unit 15 will be described in more detail.
and an inner tube 26 inserted into the outer tube 16 so as to be slidable in the axial direction.

Further, at the opening edge of the outer tube 16, there is a groove 20 with a tapered inner circumferential surface that gradually increases in diameter toward the tip.
is formed.

The groove 20 may be formed directly on the inner periphery of the edge of the opening at the tip of the outer tube 16 itself, but unless the wall thickness of the outer tube 16 is considerably large, Specifically, it is more preferable to use a threaded structure 18 of the joint as shown in FIG.

This threaded structure 18 has an inner diameter approximately equal to the outer diameter of the inner tube 26, an inner diameter of one side thereof which is approximately equal to the outer diameter of the outer tube 16, and an inner threaded portion 19 in this portion. The outer tube 1 is screwed onto the outer threaded portion 17 provided on the outer peripheral surface of the tube 16.
6 side, and on the inner circumferential surface of the opposite side, a groove portion 20 is formed that gradually increases in diameter toward the opening direction. A threaded portion 21 is provided, and a tightening nut 2 is attached to the external threaded portion 21.
2 is screwed in.

This tightening napft 22 has a press-contact portion 24 approximately equal to the outer diameter of the inner tube 26 formed on the inner peripheral portion of one side, and an outer threaded portion 24 of the threaded structure 18 extending from there to the opening on the other side.
A bag portion 25 having an outer diameter approximately equal to the outer diameter of the bag portion 25 is formed, and an inner threaded portion 23 is formed on the inner peripheral surface of the bag portion 25 to be screwed into the outer threaded portion 21, and a tightening naphof is formed. 22 in the forward and reverse directions, the pressure contact portion 24 is connected to the screw structure 18.
It is configured so that it can be moved forward and backward with respect to the distal end groove portion 20 of.

Further, there is a substantially ring-shaped ring which is located inside the inner peripheral side (bag part 25) of the tightening nut 22 and between the pressure contact part 24 and the groove part 20 of the outer pipe 16 and along the outer peripheral surface of the inner pipe 26. A biting sleeve 27 is interposed.

This biting sleeve 27 is preferably made of a relatively hard metal material, and the biting sleeve 27 is moved from the axial direction while rotating the tightening nut 22 and moving its pressure contact portion 24 toward the groove portion 20. The tip is sequentially advanced into the recessed part 20 by applying pressure.

As a result, the tip of the biting sleeve 27 is connected to the groove 2.
The inner tube 2 is gradually compressed in the inner diameter direction by the tapered surface of 0.
By biting into the outer circumferential surface of the tube 6, the outer tube 16 and the inner tube 26 can be integrally fixed to each other, and the sealing performance can be maintained completely.

FIG. 3 shows an example of piping for a sprinkler system using the piping connection unit 15, 15' described above.

In the figure, a piping connection unit 15 as a horizontal pipe has one end connected to the main piping 1) with a nipple 13 and an elbow 14.
connected via. The piping connection unit 15' as a contraction pipe is connected to the inner pipe 2 of the piping connection unit 15.
6 via an elbow 28, and a sprinkler head 29 is attached to the lower end.

However, in this case, the possible piping range is the maximum sum of the lengths of the outer pipe 16 and the inner pipe 26 that make up the unit, and the horizontal adjustment is within the range W with the nipple 13 as the fulcrum. The vertical adjustment extends to a range starting from the elbow 28.

(Effects of the Invention) As described above, the present invention consists of an outer tube and an inner tube inserted into the outer tube so as to be able to slide in the axial direction. A tightening device having a groove portion whose inner circumferential surface is tapered to have a large diameter, and a pressure contact portion having an inner diameter substantially equal to the outer diameter of the inner tube at the proximal end on the outer circumferential surface of the groove portion. A sleeve into which the nut is screwed and tightened is located on the inner circumferential side of the hole between the pressure contact part and the grooved part of the outer tube, and is inserted into the outer circumferential surface of the inner tube. Therefore, even when installing piping to install sprinkler equipment in complex areas such as the attic of a building, the length can be adjusted freely without the need for on-site processing such as cutting each pipe end. can be fine-tuned, and various types of piping can be constructed easily and efficiently without requiring special skill, resulting in work efficiency that is at least 4 to 5 times greater than conventional construction methods. can be expected to improve.

[Brief explanation of the drawing]

FIG. 1 is an enlarged half-cut sectional view of the essential parts of an example of the piping connection unit of the present invention, and FIG. 2 is a schematic perspective view showing the installed state of a sprinkler system using the piping connection unit of the present invention. FIG. 3 is a schematic perspective view showing the adjustable range of piping when using the piping connection unit of the present invention, and FIG. 4 is a schematic perspective view showing the state in which a sprinkler system is installed using conventional piping. 1)... Main pipe 15.15'... Piping connection unit 6... Outer pipe O... Bevel section 4... Pressure welding section 6... Inner pipe 8...・・・・・・・・・Screw structure 2・−・
・・・・・・・・・・・・Tightening Nand 5・・・・・・・・・
・・・・・・Bag part 7・・・・・・Bite sleeve Same as the inventor

Claims (2)

[Claims] (1) Consists of an outer tube and an inner tube that is inserted into the outer tube so that it can slide in the axial direction.The opening edge of the outer tube has a tapered inner circumferential surface that gradually increases in diameter toward the tip. A tightening nut is screwed into the outer circumferential surface of the groove, the proximal end of which has a pressure contact portion having an inner diameter substantially equal to the outer diameter of the inner tube; A connecting unit for piping comprising a sleeve that bites into the outer peripheral surface of the inner pipe and is located on the inner peripheral side of the pressure contact part and the outer pipe groove part. (2) Consisting of an outer tube and an inner tube inserted into the outer tube so as to be able to slide in the axial direction, a threaded structure is attached to the opening edge of the outer tube, and the threaded structure has a tip. A groove is formed in which the inner circumferential surface is tapered so as to gradually increase in diameter toward the opening, and the proximal end is press-welded to the outer circumferential surface of the groove with an inner diameter approximately equal to the outer diameter of the inner tube. A tightening nut having a part is screwed into the tightening nut, and an inner part is located on the inner peripheral side of the tightening nut and between the pressure contact part and the groove part provided on the inner peripheral side of the threaded structure at the tip of the outer tube. A connecting unit for piping consisting of a biting sleeve interposed on the outer circumferential surface of the pipe.