JPH0419488A - Connection unit for piping - Google Patents

Abstract

PURPOSE:To improve connection strength by providing a biting sleeve between a tapered opening end formed on an inner peripheral surface of an opening edge of an outer tube through which an inner tube is inserted and an inner-tube press-fitting part of a fastening nut, and forming a circumferencial groove on the opening end side of the sleeve. CONSTITUTION:An opening end 20 is taperedly formed on an opening edge of an outer tube by a screw structural body 18. An inner tube 26 is inserted through the outer tube 16, while a fastening unit 22 on which a press-fitting part 24 is formed is screwed in an outer screw part 21 on an outer peripheral surface of the opening end 20. A biting sleeve 27 is provided inbetween a hollow part 25 on an inner peripheral side of the fastening nut 22, and a circumferencial groove 27c is formed on the opening end side of the biting sleeve 27. By fastening the unit 22, the tip of the sleeve 27 from the groove 27c is pressed by the tapered part of the opening end 20, biting into the outer periphery of the inner tube. The piping is facilitated without a field processing, and the connection is strengthened.

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 purpose of this invention is to achieve a remarkable improvement, improve durability, and further ensure completeness of the tightening effect by the length adjustment tightening screw.

(Prior Art) Conventionally, when installing indoor sprinkler piping, for example, as shown in FIG. Connect the horizontal draw pipe 5 and the retraction pipe 6, etc., and install the sprinkler with the tip facing the indoor ceiling.
Attachment of the head 7 is also 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 intricate, so the process from the main piping 1 to the sprinkler head 7 is complicated. In order to avoid the above-mentioned obstacles, the process inevitably becomes complicated.

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, cut in advance at the factory, and threaded, then transported to the construction site, and the end of the pipe may be cut off during actual construction. screwing into the elbow 4 while making fine adjustments, and performing piping work with this in between, which requires considerable skill and is inefficient; It is assumed that approximately 10 to 15 locations can be processed at most.

(Means for Solving the Problems) Therefore, the present invention solves various difficulties in the above-mentioned conventional techniques, eliminates the need for skill in piping work, significantly improves workability during construction, and The tightening of the expandable piping is done to ensure the perfect effect. Specifically, for example, a groove is formed at the edge of the opening so that the inner circumferential surface tapers so that the diameter gradually increases toward the tip. an inner tube inserted into the outer tube so as to be able to slide in the axial direction; a tightening nut having a press-contact portion with an inner diameter substantially equal to the outer diameter of the inner tube; 1. A connecting unit for piping, comprising a biting sleeve interposed therewith, the biting sleeve having a circumferential groove formed at a position near the groove. .

Further, the present invention provides an outer tube having a threaded structure attached to the edge of the opening, and having a grooved portion whose inner peripheral surface gradually increases in diameter toward the tip opening, and an outer tube that is slidable in the axial direction within the outer tube. The inner tube is movably inserted, and the proximal end portion of the outer tube, which is screwed into the outer circumferential surface of the groove of the threaded structure so as to be axially movable, has an inner diameter that is approximately equal to the outer diameter of the inner tube. a tightening nut having a press-contact portion; and a bit interposed between the press-contact portion and the groove portion on the outer tube side along the outer circumferential surface of the inner tube on the inner circumferential side of the tightening nut. The present invention also relates to a piping connection unit comprising a sleeve, the biting sleeve having a circumferential groove formed at a position near the groove.

(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 ends are connected by screwing in another connector such as an elbow, and then 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 welding part, and by further tightening, a part of the biting sleeve is moved to the opening edge of the outer tube itself due to the presence of the groove. Alternatively, the diameter is easily reduced along the tapered groove formed on the inner circumferential side of the threaded structure, and the outer tube and inner tube are pressed together in the direction of the outer circumferential surface of the inner tube, and then bitten to connect the outer tube and the inner tube to each other. be fixed integrally.

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

In the figure, 11 is the main pipe, 15.15' is a pipe connection unit, and 14.28 is a pipe connection unit 15 used as a side pipe, or a pipe connection unit 15' used as a contraction pipe, respectively. Elbow for, 29
indicates a sprinkler head. The piping connection unit 15 as a horizontal pipe has one end screwed into the main piping 11 via a socket 12 and a nipple 13, and the other end of an elbow 14 screwed into this, and the other end screwed into another end. Attach by screwing into elbow 18.

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 explained in more detail.Basically, the outer pipe 16 and the The inner tube 26 is inserted through the inner tube 26 so as to be slidable in the axial direction.

A groove portion 20 is formed at the opening edge of the outer tube 16 and has an inner circumferential surface tapered so that the diameter gradually increases toward the tip.

The groove 20 may be formed directly on the inner periphery of the opening edge of the outer tube 16 itself, but this is generally not the case unless the wall thickness of the outer tube 16 is considerably large. More preferably, the joint has a threaded structure 18 as shown in FIG.

The second 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 provided at this portion. The outer tube 1 is screwed onto the outer threaded portion 17 provided on the outer peripheral surface of the outer tube 16.
In example 6, a groove 20 is formed on the inner circumferential surface of the opposite side of the boxlock, and the groove 20 is formed into a tapered shape that gradually increases in diameter toward the opening direction, and the outer circumferential surface of the groove has an external thread. A tightening nut 22 is attached to the externally threaded portion 21.
is screwed in.

This tightening nut 22 has a press-contacting part 24 approximately equal to the outer diameter of the inner tube 26 formed on the inner peripheral part of one side, and an outer threaded part 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. By rotating the nut 22 in the forward and reverse directions, the pressure contact portion 24 is attached to the screw structure 1.
It is configured such that it can be moved forward and backward relative to the distal end groove portion 20 of No. 8.

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.

The biting sleeve 27 is preferably made of a relatively hard metal material, and has an annular shape with an inner diameter approximately equal to the outer diameter of the inner tube 26, as shown in FIG.
A groove 27C along the circumferential direction is provided on the inner circumferential surface of the end near zero, thereby forming a cut-in groove 27d, and a large-diameter portion 27a forms a groove 27d on the opposite side through an inclined surface 27e. A sleeve chamber 27b that expands outward is formed.

Reference numeral 30 designates an annular backing material made of rubber or other elastic material and having a portion exposed into the sleeve chamber 27b.

However, the biting sleeve 27 is inserted along the outer circumferential surface of the inner tube 26 so that the biting hole 27d faces the groove part 20, and then the annular backing material 30 is bitted at one end thereof. After exposing the inside of the sleeve chamber 27b of the sleeve 27, the tightening nut 22 is further inserted into the inner threaded portion 23.
Charge the inner threaded part 23 with the threaded side first, and insert the inner threaded part 23 into the outer threaded part 21 formed on the outer tube 16 or the threaded structure 18.
The sleeve 27 is screwed onto and rotated, and the press-contact part 24 is moved in the direction of the grooved part 2o, and the biting sleeve 27 is pressed in the axial direction, so that the tip of the sleeve 27 sequentially enters the grooved part 20.

As a result, the biting edge 27d present at the tip of the biting sleeve 27 is pressed in the inner diameter direction by the tapered surface of the groove part 2o, and gradually bends in the inner diameter direction with the groove part 27c as a boundary, and the outer peripheral surface of the inner tube 26. The outer tube 16 and the inner tube 26 are integrally fixed to each other by biting into them.

In this case, the backing material 3o is also pressed between the sleeve 27 and the pressure contact portion 24 of the tightening screw 22, and is pressed against the outer circumferential surface of the inner tube 26 and the pressure contact portion 24 of the tightening screw 22, resulting in sealing performance. can be made more complete.

Further, in the above embodiment, a case has been described in which the groove portion 27c is formed on the inner peripheral surface side of the biting sleeve 27 when forming the biting edge 21d of the biting sleeve 27. However, the biting sleeve 27 is not limited to this. It may also be applied to the outer circumferential side of the sleeve 27.

(Effects of the Invention) As described above, the present invention includes attaching a screw structure to the opening edge on one side or the opening edge on the negative side, and opening the inner circumferential surface of the screw structure in a tapered shape so that the diameter gradually increases toward the tip opening. an outer tube having a tip; an inner tube inserted into the outer tube so as to be slidable in the axial direction; However, there is a tightening nut whose base end has a press-contact portion with an inner diameter approximately equal to the outer diameter of the inner tube, and a groove portion on the inner circumferential side of the tightening nut between the press-contact portion and the outer tube side. Since it consists of a biting sleeve inserted along the outer circumferential surface of the inner pipe between the pipes, it is suitable for installing piping for installing sprinkler equipment in complex areas such as the attic of a building. The length can be freely adjusted without the need for on-site processing such as cutting each pipe end, making it possible to easily and efficiently create a variety of pipes.
Moreover, it can be constructed without requiring special skill, and as a result, it is expected that work efficiency will be improved by at least 4 to 5 times compared to conventional construction methods.

Furthermore, since the biting sleeve has a circumferential groove formed at a position near the groove on the side corresponding to the groove of the outer tube, when tightened with a tightening nut, the groove is bounded. As the biting edge is pressed against the tapered surface of the groove, it can be easily bent in the inner diameter direction, and it can also bite into the outer circumferential surface of the inner tube sufficiently to further strengthen the connection between the outer tube and the inner tube. can.

Furthermore, when a Panoxong material is interposed between the sleeve and the pressure contact portion of the tightening screw, the sealing performance can be further improved.

[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, Fig. 2 is an enlarged longitudinal sectional view of the biting sleeve, and Fig. 3 is the piping connection unit of the invention. FIG. 4 is a schematic perspective view showing the installed state of the sprinkler system used. FIG. 4 is a schematic perspective view showing the installed state of the sprinkler system using conventional piping. 11... Main piping 15.15'... Piping connection unit 16... Outer pipe 18... Threaded structure 20... Groove portion 22
... Tightening pad 24 ... Pressure contact part 25 ... Bag part 6 ... Inner tube 27 ... Biting sleeve 7a.
...Large diameter part 27b...Sleeve chamber 7c...Groove part
27d... Biting edge 0... Panokisogu lumber 1) Shirifuru Kawaishi Imiyata Kogyo Yoshi Village origin Meidodo

Claims (2)

[Claims] (1) An outer tube having a bevel on one side opening edge with a tapered inner circumferential surface that gradually increases in diameter toward the tip, and an inner tube inserted into the outer tube so as to be able to slide in the axial direction. , a tightening nut screwed into the outer circumferential surface of the groove of the outer tube so as to be movable in the axial direction, the base end of which has a pressure contact portion having an inner diameter approximately equal to the outer diameter of the inner tube; and the tightening nut. The biting sleeve is interposed along the outer circumferential surface of the inner tube between the pressure welding part and the grooved part of the outer tube, and the biting sleeve has a part near the grooved part. A connecting unit for piping, characterized in that a groove is formed along the circumferential direction at the position of. (2) A threaded structure is attached to the opening edge on one side, and an outer tube has a tapered groove whose inner circumferential surface gradually increases in diameter toward the tip opening, and slides in the axial direction within the outer tube. The inner tube is movably inserted, and the proximal end portion of the outer tube, which is screwed into the outer circumferential surface of the groove of the threaded structure so as to be axially movable, has an inner diameter that is approximately equal to the outer diameter of the inner tube. A tightening nut having a press-contact part, and a bite inserted along the outer circumferential surface of the inner tube between the press-contact part and the groove part on the outer tube side on the inner circumferential side of the tightening nut. 1. A piping connection unit comprising a sleeve, the biting sleeve having a circumferential groove formed near the groove.