JP3134286B2 - Structure for preventing intrusion of sediment into resin pipe joint and method of mounting the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for retaining the function of a joint portion of a resin pipe which has been frequently used in recent years, and a specific procedure for mounting the same.

[0002]

2. Description of the Related Art A resin tube has a small specific gravity and is lightweight.
It is advantageous for handling, transportation, and pipe laying work, and
Since the resistance in a corrosive atmosphere with high humidity is also superior to that of cast iron materials, which are the mainstream of conventional water pipes, the range of application has been increasing in recent years. In terms of materials, improvements have also been made to weather resistance, which has been regarded as a problem in the past, and especially when buried in the ground, it can be overcome because the factor of deterioration over time is greatly reduced, Regarding mechanical strength, components that approach conventional ductile cast iron, such as fiber-reinforced polyamide resin, have also been developed, so that static and dynamic stresses associated with earthquakes, heavy vehicles, etc. can be applied directly. Due to its excellent flexibility, it is absorbed flexibly, and in that sense, there are many cases where attention is paid to disaster countermeasures as seismic isolation and vibration isolation pipelines.

[0003] The connection of the resin pipe does not use members such as screws or bolts and nuts for joining, and does not use a spanner, a screwdriver or other tools at the time of connection, and the structure of the joint itself depends on the structure. The most desirable method is to simply connect the end face of the resin tube from one opening and move it forward to connect it to a predetermined position.If a pipe can be formed with outstanding workability, many pipes currently used in the prior art will be used. Since the possibility of switching from a seed or a joint to a resin pipe further increases, many prior arts aiming at improvement on a joint for a resin pipe have been conventionally reported.

[0004] The points of improvement of the resin pipe joint are a perfect water sealing property for preventing leakage from the inside of the pipe and a function for preventing detachment when an external force is applied in a direction of pulling out the resin pipe after laying. These two requirements are essential basic conditions for forming the pipeline, and if there are concerns about these conditions, no matter how excellent the characteristics may be, the inspection and repair will not be realized. It is inevitable that the pipe is ineligible as an underground pipe.

[0005] Japanese Utility Model Publication No. 51-648 and Japanese Utility Model Publication No.
The configuration in which the elastic ring and the retaining wedge ring are fitted into the bulging portion in the joint main body into which the resin tube is inserted, as in Japanese Patent No. 2421, is common to the prior art because it is necessary to satisfy the above conditions. It is a born requirement. FIG. 3 is a prior art related to Japanese Utility Model Publication No. 5-9582 and Japanese Utility Model Publication No. 6-26788, which relates to the prior application of the applicant of the present invention. Since the surface hardness of vinyl chloride pipes is low, it is easy to be scratched during the connection work, and once damaged, it will have a negative effect on the water sealing action of the elastic ring. Conversely, if the elastic ring is damaged, In addition, it is stated that there is a fear of water leakage due to a small contact area between the elastic ring and the outer shell due to the small diameter of the elastic ring, and that the possibility of water leakage due to deformation of the resin tube itself cannot be denied. In the prior application, in order to solve this problem, as shown in FIG. 3, an unreacted swollen rubber ring 103 is inserted leaving a sufficient space behind a resilient ring 102 fitted into a stepped portion of an inclined cylinder 101 of a resin pipe joint. And a wedge ring 104 at the rear for retaining.
Is interposed. With this configuration, the elastic ring is twisted, deformed, or damaged, and even if the resin tube itself is deformed, the water sealing action is lost, and water leaks from the inside of the tube into the resin tube joint, the swollen rubber ring absorbs water. It claims to expand immediately and close the hollow portion between the outer shell and the resin tube, so that a sufficient water sealing action can be exhibited in place of the elastic ring.

[0006]

Not to mention the examples of the prior art described above, it is the greatest object of all the pipelines to prevent separation of the pipelines and to prevent water leakage from the pipelines. Although various proposals have been announced, concerns and concerns about the intrusion of earth and sand when the pipeline is buried underground are overlooked as an unsolved element common to these conventional technologies. Many. There is no particular problem if the pipeline is not underground and it is a pipe for factory equipment on the ground, but once it is buried underground, both the resin pipe and the resin pipe joint will be directly exposed to earth and sand. They are surrounded and face the adverse condition of having to be under the pressure of groundwater and sediment with the depth of the ground. In other words, while all prior art places importance on leakage from inside the pipe as a problem, the possibility that muddy earth and sand, such as sewage from outside the pipe, is pushed in by the earth pressure and penetrates into the resin pipe joint is low. It is hard to imagine.

Once the intrusion of earth and sand from the outside of the pipe is permitted, for example, the earth and water flows between the wedge ring fitted inside the resin pipe joint and the outer peripheral surface of the resin pipe, and the wedge bites into the outer peripheral face of the resin pipe. A lubricating action that slides the cutting edge of the wedge cut into the ring appears, causing a significant decrease in the function of preventing the separation of the wedge ring. Also, there is no undeniable concern that sewage in the soil will be pushed by excessive earth pressure to elastically deform the elastic ring and flow back into the pipe.On the contrary, particles of earth and sand will fill between the elastic ring and the outer peripheral surface of the resin pipe. In this case, the water sealing function is impaired, and there is a possibility that flowing water leaks from the inside of the pipe to the outside of the pipe. When earth and sand enter the joint for resin pipes in this way, there is a high possibility that their functions will be significantly impaired and sometimes lost, no matter how devised the construction is to prevent detachment and water leakage. I have to say.

On the other hand, with regard to machines and equipment that operate and operate in an environment such as dust, especially when a foreign matter is caught in a main part such as around a shaft, normal operation is immediately hindered, and abrasion of the shaft and heat generation are caused. Since it is inevitable to cause serious troubles such as image sticking, it is common sense to attach a dust seal between the rotating shaft and the housing from the beginning. For example, FIG. 4 illustrates a cross-sectional view of a commercially available dust seal 203 for preventing foreign matter such as dust from entering between the rotating shaft 201 of the machine and the housing 202. The horizontal and vertical mounting surfaces 204 and 205 in the mating housing require precision machining and have a large dust seal thickness and are made of a tough, large-diameter resilient annulus, which requires manual labor. It is not easy to handle and requires special tools for installation. A dust seal to be crimped from the end face of the outer peripheral surface of the rotary shaft thus finished is fitted, slid to the mounting position of the housing, housed, and further, the ring 206 is fitted and locked so as not to be detached therefrom. The work is rather complicated and requires a lot of skill, and it is an elaborate equipment which is hardly used for connecting a large number of resin pipes and connecting pipes at an outdoor laying construction site.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention reliably prevents the earth and sand containing water from entering into the resin pipe joint through a gap between the connecting surfaces of the resin pipe joint and the resin pipe. The aim is to provide a structure that maintains its function at all times and an installation procedure that can be installed very easily on site.

[0010]

The earth and sand intrusion preventing structure for a resin pipe joint according to the present invention comprises a water seal between the outer peripheral surface 11 of the oil pipe 1 and the inclined cylindrical body 21 into which the outer peripheral surface 11 is inserted. Pipe joint 2 in which an elastic ring 3 and a wedge ring 4 for retaining are interposed, the inner diameter of the pipe contact surface 51 of the inner diameter d1 before elastic deformation is slightly smaller than the outer diameter Dp of the resin pipe 1.
When a joint contact surface 52 provided with a slightly smaller inner diameter d2 than the external diameter Dj of the end face 22 of the tilt cylinder 21 of the tube contact surface 51 from extending in the axial direction of the tube resin pipe joint 2, everted resin when the
A back surface 53, which is loosely fitted to the outer peripheral surface 11 of the tube 1 with a gap therebetween, is integrally formed, and a mudguard seal ring 5 made of a thin , reversible ring-shaped elastic body having an inverted L-shaped cross section . Pipe contact
51 is an outer peripheral surface 11 of the resin pipe, and a joint contact surface 52 is a tree.
Each of the two ends is crimped against the outer peripheral surface 23 of
A structural feature is that the outer peripheral surfaces are commonly sealed.

In this construction, the cross-section of the mudguard seal ring is inverted L-shaped and thin, the pipe contact surface 51 is elastically deformed and closely adheres to the outer peripheral surface of the resin pipe, and the joint contact surface 52 is also elastically deformed. This solves the problem by preventing earth and sand and moisture outside the pipe from invading the inside of the resin pipe joint because the outer pipe 23 is in close contact with the end outer peripheral surface 23 of the resin pipe joint.

In the above basic structure, when the pipe contact surface 51 and the joint contact surface 52 of the mudguard seal ring 5 are turned upside down to form a regular L shape, the inner diameter of the back surface 53 of the joint contact surface 52 before elastic deformation is reduced. If it is set to form an inclined surface which starts with substantially the same diameter as the outer diameter Dp of the resin pipe 1 and gradually increases from the pipe contact surface 51 toward the end of the joint contact surface, the mudguard seal ring is turned over. When fitted into the outer peripheral surface of the resin pipe with the cross section of the regular L shape, the inner diameter expands gradually from the first pipe contact surface to the subsequent joint contact surface, and the mudguard seal ring almost contacts the outer peripheral surface of the resin pipe It is possible to move to the end face 22 of the target joint for resin pipe without doing so. In other words, the movement for attaching the mudguard seal ring can proceed very smoothly without any frictional resistance, which means that the problem is further spurred.

[0013] The method of mounting the mudguard seal ring according to the present invention is also very distinctive as compared with the prior art, and with this method, there is a decisive difference in implementation difficulty. That is, the outer peripheral surface 11 of the resin pipe 1 is inserted into the resin pipe joint 2 in which the elastic ring 3 and the wedge ring 4 are interposed, and is formed of an elastic annular body having an inverted L-shaped cross section by the pipe contact surface 51 and the joint contact surface 52. The pipe contact surface 51 of the mudguard seal ring 5 is turned upside down so as to face close to the end face 22 side of the joint, and the joint contact surface 52 is turned upside down so as to have a subsequent regular L-shaped section, so that the outer peripheral surface 11 of the resin pipe 1 is formed. The mudguard seal ring 5 is moved up to the connection line between the resin pipe 1 and the end face 22 of the resin pipe joint 2 and hits the end face 22, where the mudguard seal ring 5 is turned over to reverse the pipe contact face. The mounting procedure is to turn over the outer surface 11 of the resin pipe 11 and the inverted L-shape in which the joint contact surface 52 is crimped in common to the outer peripheral surface 23 of the end of the resin pipe joint. Since the mudguard seal ring is a thin elastic ring, it can be easily turned upside down to change from the inverted L shape to the normal L
It can be inverted to the shape, or can be inverted from the normal L shape to the inverted L shape. In the normal L position, the back surface 53 of the mudguard seal ring has a gap between it and the outer peripheral surface of the resin pipe. It is simply loosely fitted so that the gap expands to the rear end without contact, so there is no frictional resistance to move. The problem was solved by starting from an original idea that cannot be recognized by other conventional technologies.

[0014]

FIG. 1 is a perspective view and a partial sectional perspective view of a procedure of an embodiment of the present invention, wherein (A) and (B) show changes before and after connection. FIG. 1A shows a point in time before connection of the resin pipe and the resin pipe joint, in which a mudguard seal ring 5 is fitted over the outer peripheral surface 11 of the resin pipe 1 in an inverted L-shape to form a pipe contact surface 51 and a joint contact surface. Reference numeral 52 denotes an upper surface, which is loosely fitted by a back surface 53 (not shown) while keeping a gap on the outer peripheral surface of the resin tube. The elastic ring 3 and the wedge ring 4 are already fitted in the inclined tubular body 21 of the resin pipe joint 2 and are on standby, and the pipe contact surface side is opposed to the resin pipe joint side with the front standing. .

In FIG. 1B, the resin pipe 1 advances rightward and is inserted into the joint 2 for the resin pipe, and the distal end surface 12 of the resin pipe hits the locking surface 24 provided at the end of the joint for the resin pipe and stops. Then, predetermined positioning is performed. The mudguard seal ring 5 loosely fitted on the outer peripheral surface of the resin pipe also moves rightward together with the resin pipe, and if necessary, moves alone on the outer peripheral surface 11 to the joint side to reach the end face 22 of the resin pipe joint. At this position, the body is turned upside down at this position to return to the inverted L-shape. In this case, the pipe contact surface 51 is elastically deformed and crimped onto the outer peripheral surface of the resin pipe based on the dimensional requirements described above, and the joint contact surface 52 is elastically deformed and the end outer peripheral surface of the resin pipe joint. Since it is press-bonded on the seal 23 and is sealed in common across the both, the intrusion of earth and sand from the boundary between the end of the resin pipe joint and the resin pipe is completely prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. The requirements for a mudguard seal ring are a thin elastic ring, which can be turned upside down, and the outer peripheral surfaces of the resin pipe and the end face of the resin pipe joint after mounting. The point is that the resin tube can be sealed by pressing, and it has a margin that can be easily moved along the outer peripheral surface of the resin tube at the time of mounting. The following specific examples were set based on the conditions, but this is only an example, and it is appropriately changed according to various factors such as the shape, size, and internal pressure of the target resin pipe or resin pipe joint. Needless to say, it is desirable to do so.

FIG. 2 ( B ) is a cross-sectional view showing the original shape of the mudguard seal ring before elastic deformation. FIG. 2 ( A ) shows that the resin pipe 1 is inserted into the resin pipe joint 2 and the mudguard seal ring 5 is attached to the connection portion. Shows the completed state of the installed joint part, d1 and d
2, Dp, Dj, and D are the inner diameter of the pipe contact surface 51 of the mudguard seal ring, the inner diameter of the joint contact surface 52, and the resin pipe 1, respectively.
, The outer diameter of the end surface 22 of the resin pipe joint, and the outer diameter of the back surface 53 of the mudguard seal ring. The preferred dimensional relationship as the mutual dimensions in the figure is d1 = Dp (1-0.13) -Dp (1-0.15) mm d2 = Dj (1-0.08) -Dj (1-0.09) ) Mm D = d2 + Dp (0.73 to 0.75) mm Dj = Dp + (3.4 to 6.0) mm A favorable result is obtained.

On the other hand, FIG. 2C shows a specific mode in which the mudguard seal ring is turned upside down to fit on the outer peripheral surface of the resin pipe. Is formed with an inclined surface so as not to cause sliding friction. For example, as shown in the figure, immediately below the pipe contact surface, the outer diameter Dp of the resin pipe is substantially the same as that of the resin pipe (up to ± 1 in practice). The gap is enlarged and the end face is + 3-4m
The example of setting m is given. The so-called flared inclined surface allows the vehicle to proceed to the target position without receiving any resistance, and when it is turned upside down and attached to the outer peripheral surface of the resin pipe joint, the inclined surface of the joint contact surface is restored to the original angle. This configuration is designed so that the urging force for restoring the shape acts to further increase the crimping action.

[0019]

As described above, the present invention focuses on the proposition of intrusion of earth and sand accompanying underground burial that is easily overlooked behind the two main problems of detachment and leakage of resin pipe joints. And provided an economical prevention structure and its mounting method, the effect of cutting off other unnoticeable causes of water pollution, which can be called blind spots of the prior art, and water leakage from pipelines, is remarkable. is there. Naturally, dust seals have been developed and provided in the prior art, and needless to say, they are actually applied in various industrial fields. However, those which can be easily manufactured and easily mounted like the present invention are recognized. However, it is difficult to find any prior art superior to the present invention as a mudguard seal ring that can immediately respond to a specific condition of laying a pipe buried underground.

It is a special mounting method that makes use of the special form of the mudguard seal ring, and the sealing action between the resin pipe joint and the resin pipe is most easily completed by turning over and turning over. Is an ingenious and subversive conventional wisdom, and forms a factor that further enhances the value of the present invention, along with economic advantages.

[Brief description of the drawings]

FIG. 1 shows a state change due to a procedure of implementing the present invention (A).
It is two perspective views (partial cross section) shown by (B).

FIGS. 2A and 2B are an overall longitudinal front view showing an embodiment, a longitudinal front view of an original mudguard seal ring, and a longitudinal front view of a mudguard seal ring when it is turned upside down. .

FIG. 3 is a vertical sectional front view of the prior art.

FIG. 4 is a vertical sectional front view of a prior art dust seal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin pipe 2 Resin pipe joint 3 Elastic ring 4 Wedge ring 5 Mudguard seal ring 11 Outer peripheral surface 21 Inclined tubular body 22 End surface 23 End outer peripheral surface 51 Pipe contact surface 52 Joint contact surface 53 Back surface Dp Resin tube outer diameter Dj Resin tube joint End face outer diameter D Mudguard seal ring joint face outer diameter d1 Pipe face inner diameter d2 Joint face inner diameter

Continuation of the front page (56) References JP-A-3-41287 (JP, A) JP-A-63-45481 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 21 / 08 F16L 21/02 F16L 21/04

Claims (3)

(57) [Claims] An outer peripheral surface of a resin tube and an outer peripheral surface of the resin tube.
Elastic ring 3 for water sealing between the inclined cylindrical body 21 into which the
And a pipe connecting surface 51 having an inner diameter d1 whose inner diameter before elastic deformation is slightly smaller than the outer diameter Dp of the resin pipe 1 in the resin pipe joint 2 provided with a retaining wedge ring 4 and the like. And an inner diameter d2 slightly smaller than the outer diameter Dj of the end face 22 of the inclined cylinder 21 of the resin pipe joint 2 extending in the pipe axis direction.
And the outer periphery of the resin tube 1 when turned over
The pipe contact surface 51 is made of resin by a mudguard seal ring 5 made of a thin , reversible annular elastic body having an inverted L-shaped cross section and integrally formed with a back surface 53 which is loosely fitted to the surface 11 with a gap therebetween.
The outer peripheral surface 11 of the pipe and the joint contact surface 52 are joints for a resin pipe.
And a seal for preventing intrusion of earth and sand in a joint for a resin pipe, wherein the end outer peripheral surface 23 is press-bonded to each other to seal both the outer peripheral surfaces in common. 2. The mudguard seal ring 5 according to claim 1,
When the pipe contact surface 51 and the joint contact surface 52 are turned upside down to form a regular L-shape, the inner diameter of the back surface 53 of the joint contact surface 52 before elastic deformation starts with substantially the same diameter as the outer diameter Dp of the resin pipe 1. , Pipe contact surface 5
A structure for preventing intrusion of earth and sand in a joint for a resin pipe, characterized in that an inclined surface whose diameter gradually increases from one side toward an end of a joint contact surface is formed. 3. An outer peripheral surface 11 of the resin pipe 1 is inserted into the resin pipe joint 2 in which an elastic ring 3 and a wedge ring 4 are interposed, and an elastic ring having an inverted L-shaped cross section is formed by a pipe contact surface 51 and a joint contact surface 52. The pipe contact surface 51 of the mudguard seal ring 5 made of a body is turned upside down and close to the end face 22 side of the joint.
The resin ring 1 is loosely fitted on the outer peripheral surface 11 of the resin pipe 1 so as to be turned upside down to form a subsequent regular L shape, and the mudguard seal ring 5 is moved to a connection line between the resin pipe 1 and the end face 22 of the resin pipe joint 2. Then, the tip of the pipe contact surface 51 collides with the end surface 22, and the mudguard seal ring 5 is turned over to turn the pipe contact surface 51 to the outer peripheral surface 11 of the resin pipe and the joint contact surface 52 to the end of the resin pipe joint. A method for mounting a sediment intrusion preventing structure for a joint for a resin pipe, characterized in that the joint is turned upside down into an inverted L shape that is commonly crimped to the outer peripheral surface 23.