JPH0732283U - Pipe end anticorrosion flange - Google Patents

Abstract

(57) [Summary] [Purpose] The core can be mounted normally without providing protrusions on the inner surface, the number of parts and mounting man-hours do not increase, the rotation and rattling of the core can be prevented, and the quality control of the anticorrosion core itself is also possible. Provides an easy pipe end anticorrosion flange. [Structure] The tube end anticorrosion flange 1 is composed of a flange main body 2 and an anticorrosion core 3, and a tube body 4 is connected thereto. Flange body 2
On the inner surface, a female thread portion 2a for pipe and a female thread portion 2c for core are screwed. The anticorrosion core 3 has a collar portion 3a and a cylindrical portion 3b, and forms a male screw portion 3c to be screwed into the core female screw portion 2c.
The female thread portion 2a for the pipe body is formed as a right-hand thread, and the female thread portion 2c for the core is formed as a left-hand thread. Since the inner surface of the pipe and the outer surface of the cylindrical portion are friction-bonded to each other, the anticorrosion core 3 can be automatically and firmly mounted by screwing the pipe body 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe end anticorrosion flange for connecting pipes each having an anticorrosion coating on the inner surface thereof, and more particularly to a pipe end anticorrosion flange having a synthetic resin anticorrosion core therein.

[0002]

[Prior art]

 Generally, pipes for water supply are coated with nylon as an anticorrosion coating on the inner surface and anticorrosion treatment such as zinc plating on the outer surface.However, the pipe ends connected via flanges, etc. are also subjected to these anticorrosion treatments. Not not. Therefore, the female screw part that is screwed inside the flange has an exposed structure, which causes direct contact with water and causes rust. For this reason, a so-called pipe end anticorrosion flange is used that covers the exposed female screw part with a synthetic resin anticorrosion core and inserts and engages the cylindrical part of the anticorrosion core into the inner surface of the connecting pipe to perform anticorrosion treatment. .

In the conventional pipe end anticorrosion flange, a male screw portion is formed on the flange portion side of the anticorrosion core, and this is screwed into a female screw portion on the inner surface of the flange. Since the female thread for the core was continuous with the female thread for the pipe, when the cylindrical portion of the anticorrosion core was inserted into and engaged with the inner surface of the pipe, the anticorrosion core rotated as the pipe advanced. There was a risk of being pushed out.

For this reason, a rotary dowel for screwing the anticorrosion core or the like is provided on the inner surface of the core, or as described in, for example, Japanese Utility Model Laid-Open No. 4-31388, a ring is formed from the end surface of the flange to the anticorrosion core. A method of abutting on the flange and fixing this ring to the flange has been used. There is also a type in which a groove for preventing protrusion is provided on the inner surface of the flange, and an anticorrosion core that engages with this is injection-molded to be integrated with the flange.

[0005]

[Problems to be solved by the device]

 However, the presence of protrusions on the inner surface of the core has the drawback of increasing the head loss of the fluid. In addition, the method of fixing the core by the ring has a drawback that the number of parts is increased and the man-hour required for mounting is also increased. On the other hand, since the injection molded core is not fixed to the flange, it was necessary to fill it with a sealant to prevent rotation and rattling of the core. In addition, if the corrosion-resistant core is integrated with the flange by injection molding, there is a problem that the flange itself becomes a defective product even if the corrosion-resistant core is not good. It was also difficult to confirm the quality of the anticorrosion core itself.

The present invention solves the above-mentioned problems and allows the anticorrosion core to be properly mounted without providing a protrusion on the inner surface of the core, which does not increase the number of parts or the number of mounting steps, and moreover, does not require filling of a sealing material to form the core. The objective is to provide a pipe end anticorrosion flange that can prevent rotation and rattling, and can easily control the quality of the anticorrosion core itself.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the pipe end anticorrosion flange of the present invention has a female threaded portion on its inner surface, and an anticorrosion core having a cylindrical portion and a collar portion is attached to one end of the female threaded portion, In the pipe end anticorrosion flange having a structure in which the cylindrical portion is engaged with the inner surface of the tubular body that is screwed from the other end of the portion to perform anticorrosion joining, the anticorrosion core has a male screw portion on the collar side, The threaded portion is provided with a female threaded portion for a tubular body to which the tubular body is screwed and a female threaded portion for a core to which the male threaded portion of the anticorrosion core is screwed. The parts are characterized by one screw on the right and the other screw on the left.

[0008]

[Action]

 In the pipe end anticorrosion flange of the present invention, the male screw portion on the flange portion side of the anticorrosion core is screwed into the female screw portion for core on the inner surface of the flange, and is screwed until the flange portion comes into contact with one surface of the flange. At this time, the cylindrical part of the anticorrosion core is housed inside the flange, but does not contact the female screw part, leaving a gap for tube entry. When the pipe is screwed into the female thread for pipe from the other side of the flange and screwed in, the cylindrical part with an outer diameter somewhat larger than the inner diameter of the pipe elastically deforms and inserts into the inside of the pipe. To do. The inner surface of the pipe and the outer surface of the cylindrical portion are friction-bonded to each other, and the cylindrical portion also rotates in the rotating direction of the pipe. However, one of the female threaded portion for the tubular body to which the tubular body is screwed and the female threaded portion for the core to which the anticorrosive core is screwed is the right screw and the other is the left screw. The anticorrosion core is also screwed in. Therefore, the anticorrosion core can be automatically attached by screwing the tubular body, and conversely, the anticorrosion core can be loosened by removing the tubular body.

[0010]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of a pipe end anticorrosion flange of the present invention. The pipe end anticorrosion flange 1 is composed of a flange body 2 and an anticorrosion core 3 mounted on the flange side, and a pipe body 4 to be connected is connected to the flange boss side. The tube body 4 is a cast iron tube having an inner surface 4a coated with nylon and an outer surface 4b subjected to galvanizing anticorrosion treatment, and a male screw 4c is threaded on the end of the tube body. On the other hand, the flange main body 2 is made of cast iron, and a female thread portion 2a for the pipe body is screwed from the boss side, and a notch portion 2b for mounting the anticorrosion core 3 is formed on the flange side. The part 2c is threaded.

The anticorrosion core 3 is made of a synthetic resin such as vinyl chloride, and has a flange portion 3a that fits into the recess 2b and a cylindrical portion 3b that projects from the flange portion 3a. Although the outer diameter of the cylindrical portion 3b is somewhat larger than the inner diameter of the tubular body 4, it does not come into contact with the female thread portion 2a for the tubular body and leaves a gap for entering the tubular body at the time of mounting. Further, a male screw portion 3c to be screwed into the female screw portion 2c for core is formed on the flange portion 3a side of the cylindrical portion 3b. The male screw 4c of the pipe body 4 and the female screw portion 2a for the pipe body are formed by a normal right screw, while the female screw portion 2c for the core and the male screw portion 3c are formed by a left screw. A seal ring 3d made of natural rubber is wound around the male screw portion 3c side of the cylindrical portion 3b.

Next, the operation of the pipe end anticorrosion flange will be described. The male screw portion 3c on the flange 3a side of the anticorrosion core 3 is screwed into the internal female screw portion 2c for the core on the inner surface of the flange body 2, and is screwed until the flange portion 3a abuts the notch 2b. At this time, the cylindrical portion 3b of the anticorrosion core 3 is housed inside the flange. When the tubular body 4 is screwed into the female body thread portion 2a for the tubular body from the boss side of the flange body 2 and screwed in, the cylindrical portion 3b of the anticorrosion core 3 is elastically deformed and is inserted and engaged with the inner surface 4a of the tubular body 4. . The inner surface 4a of the tubular body 4 and the outer surface of the cylindrical portion 3b are frictionally joined to each other, so that the cylindrical portion 3b also rotates in the rotational direction of the tubular body 4.

However, since the core female screw portion 2c with which the anticorrosion core 3 is screwed is a left-hand thread, the screwing of the tube body 4 acts in the direction of retracting the anticorrosion core 3. Therefore, the anticorrosion core 3 can be automatically and firmly mounted by screwing the tube body 4. Further, when removing the tubular body 4, the anticorrosion core 3 can be loosened within a range where friction acts.

As described above, since the pipe end anticorrosion flange 1 can automatically fasten and loosen the anticorrosion core 3, even if the anticorrosion core 3 is hand-tightened, it is completed at the stage of screwing the pipe body 4. It can be tightened up to the full state. Further, since the anticorrosion core 3 has a detachable structure, it can be easily separated even when the pipe is dismantled due to deterioration of the pipe equipment, etc., and the waste material treatment becomes simple.

In the above embodiments, the female thread for the pipe body is the right-hand thread and the female thread for the core is the left-hand thread. Of course, the main body is not limited to cast iron.

[0016]

[Effect of device]

 As described above, in the pipe end anticorrosion flange of the present invention, one of the female thread portion for the pipe body and the female thread portion for the core has a right-hand thread and the other has a left-hand thread. The edible core can be automatically and firmly installed, and the erosion-proof core can be automatically loosened even when the pipe body is removed. In this way, since the anticorrosion core is mounted according to the difference in screw fastening direction, it is not necessary to provide a protrusion on the inner surface of the core, and it is not necessary to fix the core with a member such as a ring. Therefore, the number of parts and man-hours for mounting are not increased. Further, since the pipe body can be completely tightened at the stage of screwing, it is not necessary to fill the seal material for preventing rattling and rotation of the core. Moreover, since the anticorrosion core has a detachable structure, the quality control is easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a pipe end anticorrosion flange.

[Explanation of symbols]

 1 Pipe End Anticorrosion Flange 2 Flange Main Body 2a Pipe Female Thread 2c Core Female Thread 3 Corrosion Core 3a Collar 3b Cylindrical 3c Male Thread 4 Pipe 4a Inner Surface

Claims (1)

[Scope of utility model registration request] 1. A pipe body in which an internal thread portion is threaded on an inner surface, an anticorrosion core having a cylindrical portion and a flange portion is attached to one end portion of the internal thread portion, and is screwed from the other end portion of the female screw portion. In a pipe end anticorrosion flange having a structure in which the cylindrical portion is engaged with the inner surface of the anticorrosion joint, the anticorrosion core forms a male screw portion on the flange side, and the female screw portion screws the pipe body. A female thread portion for the pipe body and a female thread portion for the core to which the male thread portion of the anticorrosion core is screwed are provided. One of the female thread portion for the pipe body and the female thread portion for the core is a right-hand thread and the other is a left-hand thread. A pipe end anticorrosion flange characterized in that