JP2002213663A - Tubular body connecting structure and header - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubular body connecting structure for inserting a spigot into a socket after mounting an O-ring and an anti-loosing ring therein, with the O-ring being arranged on the depth side, eliminating possible damages to the outer face of the spigot due to the anti-loosing ring during insertion, and assuring satisfactory water sealing property with the O-ring. SOLUTION: The connecting structure, for enabling a seal ring 13 to be mounted in the socket 1 on its depth side and the spigot 2 to be inserted into the socket 1 in which the anti-loosing ring 15 is mounted on the front side of the seal ring 13, comprises a level difference p provided on the outer face of the spigot 2, so that the outer diameter of a portion 21 ranging from an end 211 of the spigot 2 to at least a seal ring press-contact portion is smaller than the outer diameter of an anti-loosing ring locking portion 22 of the spigot 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in connection structure for a tubular body and a header connecting header tube units by the connection structure.

[0002]

2. Description of the Related Art To connect a tubular body, an outlet is inserted into a receptacle provided with an O-ring and a retaining ring, and an O-ring is inserted.
It has been known that compression of the ring imparts watertightness and prevents the tip of the retaining ring from being pulled out into the outer surface of the insertion opening to prevent the ring from being pulled out. In this connection structure,
If the retaining ring is arranged on the back side of the O-ring, the retaining ring comes into contact with the transport liquid and is easily corroded, and it is difficult to guarantee durability. If a retaining ring made of resin is used to prevent this corrosion, the strength of the resin is lower than that of metal, so that the retaining ring is inevitably increased in size, and the dimensions of the connection portion must be increased.

On the other hand, if the retaining ring is arranged outside the O-ring, the surface is damaged when the outlet passes through the retaining ring, and the O-ring is pressed against the damaged surface of the outlet. In addition, it is difficult to guarantee sufficient watertightness.

[0004]

The problem to be solved by the present invention is disclosed in
In Japanese Patent No. 82848, even if the retaining ring is disposed outside the O-ring, as shown in FIG. 6A, in order to prevent the retaining ring from being damaged by the retaining ring,
An annular wedge-shaped spacer 17 'is provided in front of the retaining ring 15'.
Are disposed adjacent to each other, and during insertion of the insertion port 2 ′, the inner peripheral tip 171 ′ of the wedge-shaped spacer 17 ′ is inserted under the claw 151 ′ on the inner circumference of the retaining ring 15 ′, and the claw 151 ′ is inserted. After the insertion of the insertion port 2 ', the insertion ring 2' is pulled in the pulling-out direction as shown in FIG. 6B, and the retaining ring is moved by the movement of the wedge-shaped spacer 17 'in the direction of the arrow as shown in FIG. It has been proposed that a nail 151 ′ on the inner circumference of 15 ′ is brought into contact with the surface of the insertion port 2 ′ and bites it.

However, in FIG. 6B, the wedge-shaped spacer 17 'is pulled by pulling the outlet 2' in the pulling-out direction.
As shown in FIG. 6C, the inner peripheral tip 171 'of the wedge-shaped spacer 17' is moved to the retaining ring 1 as shown in FIG.
When pressed by the 5 'claw 151', the frictional binding force between the inner peripheral tip 171 'of the wedge-shaped spacer 17' and the outer surface of the insertion opening 2 'is prevented from being removed.
Although it is necessary to lower the frictional binding force between the inner peripheral tip 171 'of the wedge-shaped spacer 17' and 51 ', it is difficult to ensure this condition stably, and it is difficult It is difficult to guarantee that it will come off.

[0006] An object of the present invention is to mount an O-ring and a retaining ring in a receptacle with the O-ring disposed on the back side.
An object of the present invention is to provide a tubular body connecting structure in which an insertion port is inserted so as to prevent the outer surface of the insertion port from being damaged by a retaining ring at the time of insertion, thereby ensuring satisfactory watertightness by an O-ring.

[0007]

According to the connecting structure of a tubular body according to the present invention, a sealing ring is mounted on the inner side of a receiving port, and an outlet is provided on a receiving port on which a retaining member is mounted outside the sealing ring. In the insertion connection structure, an outer diameter of a front portion extending from a tip of the insertion port to at least the seal ring press-contact portion is smaller than an outer diameter of a rear portion of the insertion port where the retaining member is bitten and locked. It is a configuration, a spacer is incorporated in the receiving port, a space between the spacer and the rear step surface in the receiving port is used as a seal ring mounting space, and the stopper member is held by a cap nut for holding and fixing the spacer and the spacer. Can be clamped.

The header according to the present invention has a plurality of branch pipe header pipe units to which branch pipes are connected to side portions and a main pipe header pipe unit to which main pipes are connected. A configuration is characterized in that the tubular body is connected to each other and between the branch pipe header pipe unit and the main pipe header pipe by the above-mentioned tubular body insertion connection structure.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing one embodiment of the plug-in connection structure according to the present invention. Figure 1
In the figure, reference numeral 1 designates a receptacle integrally formed at one end of one tubular body A1, into which a spacer 11 is incorporated, and a cap nut 12 for holding down and fixing the spacer 11 is screwed. 13 is a seal ring (O
Ring), the rear step surface 14 in the receptacle and the spacer 1
1 is housed in the annular space. Reference numeral 15 denotes a retaining member, for example, a retaining ring, which can be a rigid metal plate ring (for example, a steel plate ring) formed by forming a claw 151 with a cut in the inner peripheral portion. Between the seal ring 1
It is arranged ahead of 3. 16 is the retaining ring 15
This is a space for accommodating the expanded claw 151, and is formed by notching the spacer 11.

Reference numeral 2 denotes an outlet formed at the other end of the other tubular body A2. The outer diameter of the front portion 21 from the front end 211 of the inlet to a position p beyond the seal ring press-contact portion is determined by the inner diameter of the retaining ring 15. The outer diameter of the rear portion 22 from the position p to the insertion opening end 20 is made larger than the inner diameter of the retaining ring 15, and a step 23 exists at the position p.

In the illustrated embodiment, the step 23 is located in the middle of the inner surface of the spacer, and a step 123 to be locked to the step is formed on the inner surface of the spacer 11. Therefore,
In the illustrated embodiment, the insertion limit of the outlet is regulated by the contact of the step surface 23 on the outer surface of the spacer with the step surface 123 on the inner surface of the spacer.

In order to connect a tubular body by the connection structure according to the present invention, a seal ring and a spacer are placed in a receiving port, a retaining ring is arranged on an end face of the receiving port, and a cap nut is screwed to hold the retaining ring. Keep it fixed. After performing such preparation work, a reinforcing core (indicated by reference numeral 3 in FIG. 1, usually made of metal) is inserted into the insertion port 2, and then (a) in FIG. ) And (b), the outlet 2 is inserted into the receiver 1.

In this case, as shown in FIG. 2A, the front small diameter portion 21 of the outlet 2 (ie, the front end 211 of the outlet 2).
When the outer diameter of the insertion portion 21 is set to the retaining ring 1
5 is smaller than the inner diameter of the lock ring 5, the pawl 151 on the inner circumference of the retaining ring is not expanded. Can be inserted and pressed into the inner periphery of the pipe, and good watertightness can be guaranteed.

As described above, after the retaining ring 15 is passed through the small front diameter portion 21 of the insertion port 2, FIG.
As shown in (2), the rear large diameter portion 22 of the outlet 2 is inserted into the retaining ring 15. Since the rear diameter large portion 22 is larger than the inner diameter of the retaining ring 15, it is scratched by the claw 151 on the inner periphery of the retaining ring 15.
Does not reach the seal ring 13 and does not contribute to the watertightness, and thus has no influence on the above-mentioned provision of the watertightness.

In the above, the front small diameter portion 21 of the outlet 2
It is safe that the outer diameter of the seal ring is smaller than the inner diameter of the retaining ring 15 as described above, but even if it comes into contact with the claws 151 on the inner periphery of the retaining ring, the seal ring sufficiently guarantees water tightness. It is also possible to make the outer diameter of the front small diameter portion of the spout substantially equal to the inner diameter of the retaining ring, provided that the outer surface of the front small diameter portion can be prevented from being damaged as much as possible.

As shown in FIG. 1, after the outlet 2 is inserted at the insertion limit described above, that is, until the step surface 23 on the outer surface of the outlet 2 comes into contact with the step surface 123 on the inner surface of the spacer 11, it is inserted. Thereafter, the outlet 2 is pulled in the pull-out direction, and the retaining ring 1 is attached to the large-diameter rear portion 22 of the outlet 2.
The nail 151 on the inner circumference of No. 5 is bite-locked to provide a pull-out resistance, and the connection operation is completed.

In the above embodiment, the insertion limit of the insertion port is regulated by the contact of the step surface in the middle of the outer surface of the spacer with the step surface in the middle of the inner surface of the spacer.
Can be regulated by the contact of the front end 211 of the insertion port with the innermost step surface 111 of the receptacle or the contact of the start end step surface 20 of the insertion port 2 with the cap nut 12. For the tubular body having the receiving port, the cap nut, the spacer, and the tubular body having the port, an injection molded article of a synthetic resin, preferably an injection molded article of a heat resistant olefin resin such as crosslinked polyethylene is used. A rubber ring is usually used for the seal ring, but a synthetic resin ring can also be used. The retaining member is usually made of metal, can be used as long as it is sandwiched between the cap nut and the spacer and bites into the outer surface of the insertion port at the end to be locked.

By the way, in a high-rise building or an apartment house, a piping system is used in which a water supply / hot water supply main pipe is connected to a header, and a water supply / hot water supply branch pipe reaching each use point is connected to the header. It is known to assemble headers by connecting header tube units so that they can be easily accommodated. FIG. 3 shows an embodiment of a header in which the header tube units A3,... Are connected by the connection structure according to the present invention, and has the above-described receptacle 1 at one end and the above-mentioned insertion port 2 at the other end. A plurality of branch pipe header pipe units A3 and A4 each having a branch pipe connection port 4 at the end thereof are inserted and connected by the connection structure according to the present invention, and one end is closed and the other end has a connection port 2 at the other end. A5 is inserted and connected to the final header tube unit A4 of the connection header by the connection structure according to the present invention, and the main tube header tube unit A6 having the receptacle 1 at one end and the main tube connection port 5 at the other end is connected to the connection. The first header tube unit A4 of the header is inserted and connected by the connection structure according to the present invention.

FIG. 4 shows another embodiment of a header in which the header tube units A3 ',... Are connected by the connection structure according to the present invention. The header 2 has one end at one end and the receptacle 1 at the other end. A plurality of branch pipe header pipe units A3 ', A4' having a branch pipe connection port 4 on the side are inserted and connected by the connection structure according to the present invention, and a receiving port 1 is provided at one end, and the other end is closed. The connected end branch pipe header pipe unit A5 'is inserted and connected to the final header pipe unit A4' of the connection header by the connection structure according to the present invention, and has a socket 2 at one end and a main pipe connection port 5 at the other end. Is connected to the first header pipe unit A4 'of the connection header by the connection structure according to the present invention. In FIGS. 3 and 4, each reference numeral indicates each member described above, 11 is a spacer, 12 is a cap nut 12, 13 is a seal ring (O-ring), and 16 is a gap between the rear step surface in the receptacle and the spacer 11. An annular space between them, 15 is a retaining ring,
Reference numeral 16 denotes a space for accommodating the expanded claw 151 of the retaining ring 15, reference numeral 21 denotes a front small diameter portion of the outlet, reference numeral 22 denotes a rear large diameter portion, reference numeral 23 denotes a step 23 on the outer surface of the front entrance, and reference numeral 3 denotes a reinforcing core. It is.

The number of the branch pipes of the header is required to be at least three for a bathtub, a kitchen, and a wash basin, and a branch pipe header pipe unit A3 (A3 ') having two branch pipe connection ports. And an end branch pipe header unit A5 (A5 ') for one end which has one branch pipe connection port and is closed at one end.
And a main pipe header pipe unit A6 (A6 ') connected to the pipe. If three or more branch pipes are required,
Header pipe unit A4 (A
4 ') are connected as many as required.

In order to connect a branch pipe to the branch pipe header pipe unit, a method can be used in which a joint is connected to a branch pipe connection port and a branch pipe is connected to the joint. FIG. 5 shows an example of the joint structure. Is shown. In FIG. 5, reference numeral 6 denotes a joint including an inner member 61 and an outer member 62. The inner member 61 has an insertion portion 611, a core portion 612, and a flange portion 613.
The insertion portion 611 is inserted into the branch pipe connection port 4 of the header pipe unit A via the packing 631, and the branch pipe connection port 4
Of the loose flange 64 fitted to the outer surface of the
11 is fastened by bolts 633 via a packing 632, and an O-ring 634 is mounted in a groove on the outer surface of the core 612. The outer member 62 includes a cover 621 and a cap nut 622.
The front end of the cover 621 is screwed to the body of the inner member 61, and the retaining ring 635 is pressed and fixed by screwing the cap nut 622. To connect the branch pipes, the branch pipes are pressed tightly over the O-ring of the core, and then pulled in the withdrawal direction so that the retaining rings bite into the outer surface of the branch pipes, thereby completing the connection of the branch pipes.

Since the fluid from the main pipe enters the header and is divided into a plurality of branch pipes, the amount of fluid flowing through the connection of the header pipe unit pipe is larger than the amount of fluid flowing through the branch pipe connection. However, the connecting portion between the header pipe units is provided with a core portion (61 in FIG. 5) in the branch pipe connecting portion.
Since the cross-sectional area of the flow path can be increased correspondingly without 2), it is possible to cope with the large flow rate well.

[0023]

According to the connecting structure of the tubular body according to the present invention, when the insertion is made by inserting the insertion port into the receptacle in which the seal ring and the retaining member are mounted, even if the seal ring is disposed on the back side, the seal ring is not removed. It is possible to impart good watertightness because the outer surface portion of the outlet to be pressed against is not damaged by the claws of the retaining member. Since it is possible to reliably bite the outer surface of the outer opening, sufficient pull-out resistance can be imparted. Further, since the seal ring prevents water from stopping, the retaining ring disposed outside the seal ring does not come into contact with the fluid. Pullability can be guaranteed.

According to the header according to the present invention, it is possible to insert and connect the header pipe units with good water tightness and pull-out resistance, and to easily assemble a header having excellent water tightness and pull-out resistance. Since the flow resistance can be reduced by sufficiently increasing the cross-sectional area of the inside, smooth water supply and hot water supply can be guaranteed.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a connection structure for a tubular body according to the present invention.

FIG. 2 is a view showing a process of assembling a connection structure for a tubular body according to the present invention.

FIG. 3 is a view showing one embodiment of a header according to the present invention.

FIG. 4 is a view showing another embodiment of the header according to the present invention.

FIG. 5 is a drawing showing an example of a connection structure between a header and a branch pipe according to the present invention.

FIG. 6 is a drawing showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving port 11 Spacer 12 Cap nut 13 Seal ring 2 Insert 21 Small front diameter of insertion 22 Large rear diameter of insertion p Step A3 Branch pipe header unit A4 Branch pipe header pipe unit A5 Branch pipe header pipe unit A6 Main tube header tube unit

Claims (3)

[Claims] 1. A seal ring is mounted on the inner side of the receptacle,
In a connection structure in which an outlet is inserted into a receptacle provided with a retaining member outside the seal ring, the retaining member at the entrance bites an outer diameter of a front portion from a tip of the inlet to at least a seal ring press-contact portion. An insertion connection structure for a tubular body, wherein the outer diameter of the rear portion to be locked is smaller than the outer diameter. 2. A spacer is incorporated in a receiving port, a space between the spacer and a rear step surface in the receiving port is used as a seal ring mounting space, and a cap nut for holding and fixing the spacer and the spacer are used to prevent the removal. 2. The plug-in connection structure for a tubular body according to claim 1, wherein the members are sandwiched. 3. A branch pipe header pipe unit having a plurality of branch pipes connected to a side pipe at a side portion and a main pipe header pipe unit connected to a main pipe. A header characterized in that the header tube unit and the main tube header tube unit are connected by the tubular body insertion connection structure according to claim 1 or 2.