KR20220112931A - Connecting socket for sprinkler and method for manufacturing the same - Google Patents

Abstract

According to an embodiment of the present invention, provided is a connecting socket for a sprinkler, in which a water supply pipe is connected to one end, an expansion pipe is inserted to the other end, and a plurality of sealings are fitted to the inner circumferential surface, wherein the connecting socket includes a socket body defined as a cylindrical extruded pipe having a predetermined length, inner diameter and thickness, and the socket body has, on the inner circumferential surface, a water supply pipe seating portion on which the water supply pipe is seated, a pipe expansion portion holding projection on which a first pipe expansion portion formed at one end of the expansion pipe is seated, and a plurality of middle sealing seating portions on which the plurality of sealings are mounted. Since the extruded pipe is used as a material, the connecting socket has no weld line, thereby having high pressure resistance and bearing an impact, pressure, and the thermal expansion of the expansion pipe.

Description

Connecting socket for sprinkler and method for manufacturing the same

The present invention relates to a connection socket for a sprinkler and a method for manufacturing the same.

A sprinkler is a device installed on the ceiling of a building to extinguish a fire by spraying water toward the floor when a fire occurs. In order to install the sprinkler on the ceiling, a main water supply pipe parallel to the ceiling is first installed, and a branch water pipe branching from the main water pipe is coupled, so that the branch water pipe extends in a direction crossing the main water pipe.

In addition, a flexible tube capable of bending and length deformation is connected to an end of the branch water supply pipe, and a sprinkler head is connected to an end of the flexible tube.

Here, when the branch water supply pipe is made of a plastic material and the expansion and contraction pipe is made of a metal material, a separate connecting member is interposed to connect the pipes of different materials without leakage.

Korean Patent Registration No. 10-1748395 (June 12, 2017) (hereinafter referred to as prior art) discloses an adapter for connecting a branch water supply pipe and an expansion pipe.

According to the prior art, an adapter made of a CPVC material is used to connect a branch water supply pipe made of a plastic material and a telescopic pipe made of a metal material. In detail, the branch water supply pipe and the adapter are coupled by an adhesive, and the expansion and contraction pipe is fitted to the adapter.

The conventional connecting member such as the adapter is an injection-molded product manufactured through an injection molding process, and has a disadvantage in that the internal pressure to withstand the water pressure of the water flowing along the water supply pipe is lowered.

In detail, in order to injection mold a cylindrical tube, the resin is injected into the cylindrical mold, and the resin is injected in a direction orthogonal to the longitudinal direction of the cylindrical mold. Therefore, the resin injected into the mold is split and spread in both directions along the circumferential surface of the cylindrical mold from the injection hole, and meets at the opposite side of the injection hole to fill the inside of the mold.

According to this injection method, a weld line is inevitably formed at the point where the resin meets on the opposite side of the injection hole. Weld line is what occurs when two or more flow fronts meet. When two flows flowing at different speeds meet, the resin temperature is low, the gas vent is not well done, or the injection speed is low. It can be understood as a boundary line formed when resins that have lost heat through the mold because they are too slow meet each other and do not mix completely and harden.

In the weld line portion, since the bonding strength and density of the resin are very low, there is a disadvantage in that the withstand pressure is very low. Therefore, when an injection-molded adapter is applied, cracks are formed in the weld line or the adapter is ruptured in an instant during the operation of the sprinkler due to the high pressure of the fire water flowing into the adapter when a fire occurs. .

Even if a problem occurs in only one adapter among a plurality of adapters installed on the ceiling, the ceiling must be completely disassembled and repaired. Therefore, the demand for an adapter with high pressure resistance is very high.

In addition, when the adapter is injection-molded, the time required for resin injection and the time required for the injected resin to be cured must inevitably be secured, so that the time it takes to manufacture the adapter increases.

In addition, if the temperature change is not precisely controlled when the injected resin is cured, not only a weld line is formed, but in the worst case, it hardens before forming a weld line, and a problem that a complete cylindrical adapter cannot be formed. can

The present invention is proposed to improve the above problems.

A connection socket for a sprinkler according to an embodiment of the present invention for achieving the above object, a water supply pipe is connected to one end, a telescopic pipe is inserted into the other end, and a plurality of seals are fitted on the inner circumferential surface of the sprinkler connection socket including, wherein the connection socket includes a socket body defined as a cylindrical extrusion-molded tube having a predetermined length, an inner diameter, and a thickness, and an inner circumferential surface of the socket body, a water supply pipe seating part on which the water supply pipe is seated And, it is characterized in that the first expansion pipe portion formed at one end of the expansion pipe to be seated, and a plurality of middle sealing seating portion to which the plurality of seals are mounted are formed.

According to the connection socket for a sprinkler and a manufacturing method thereof according to an embodiment of the present invention having the configuration as described above, the following effects are obtained.

First, since an extrusion-molded pipe, not injection-molded, is used as a material for the connection socket, there is no weld line, so the pressure resistance is high, and the ability to withstand shock or pressure as well as thermal expansion of the expansion and contraction pipe is excellent.

Second, there is an advantage in that the manufacturing cost is reduced because the compression molding manufacturing cost is low compared to the manufacturing cost of the injection mold.

Third, there is an advantage in that the time it takes to manufacture the connection socket through the extrusion process is shortened compared to the time it takes to manufacture the connection socket through the injection process.

Fourth, there is an advantage in that the precision of the groove formed on the inner circumferential surface of the connection socket for mounting the sealing is increased. Specifically, compared to the case where the sealing groove is formed on the inner circumferential surface of the connection socket through injection molding, the sealing groove formed by cutting the inner surface after extrusion molding has higher precision and less tolerance, so that the sealing is performed in the sealing groove. It has the advantage of excellent sealing force between the expansion pipe and the connection socket in the mounted state.

1 is a cross-sectional view showing a sprinkler coupling structure according to an embodiment of the present invention.
2 is a flowchart illustrating a method of manufacturing a connection socket for a sprinkler according to an embodiment of the present invention.

1 is a cross-sectional view showing a sprinkler coupling structure according to an embodiment of the present invention.

Referring to FIG. 1 , the connection socket 10 for sprinklers according to an embodiment of the present invention includes an extruded pipe made of a plastic material having a cylindrical shape.

In detail, a water supply pipe 30 is connected to one end of the connection socket 10 , and a telescopic pipe 20 is connected to the other end. The water supply pipe 30 may be a branch water supply pipe branching from the main water supply pipe, and the expansion and contraction pipe 20 may be a flexible tube made of a metal material that can be bent and adjusted in length. A plurality of seal rings 30 may be coupled to the inner circumferential surface of the connection socket 10 .

The expansion and contraction pipe 20 includes a first expanded pipe section 201 formed at one end, a second expanded pipe section 202 formed at a point spaced apart from the first expanded pipe section 201 by a predetermined distance, and the second pipe section. 2 may include a wrinkle portion 203 formed at a point spaced a predetermined distance from the expansion tube 202 .

The connection socket 10 includes a socket body 110 defined as a cylindrical extruded tube having a predetermined length, thickness, and inner diameter.

A water supply pipe seating part 111 , an expansion pipe stopper 112 , a middle sealing seating part 113 , and an outer sealing seating part 114 may be formed on the inner circumferential surface of the socket body 110 .

The inner diameter of the socket body 110 may be designed to have a size corresponding to the outer diameter of the expansion and contraction pipe 20 .

In addition, the plurality of middle sealing seating parts 113 are disposed to be spaced apart from one end of the socket body 110 by a predetermined distance toward the other end of the socket body 110 by a predetermined distance.

Each of the plurality of middle sealing seating parts 113 is recessed or stepped to a predetermined depth from the inner circumferential surface of the socket body 110 . At least one of a depth and a width of each of the middle sealing mounting parts 113 may be formed to have a size equal to or smaller than a diameter of the middle seal 32 fitted to the middle sealing mounting part 113 .

In addition, the volume of the middle seal seating part 113 is formed to be smaller than the volume of the middle seal 32 , and when the expansion and contraction pipe 20 is inserted into the socket body 110 , the middle seal 32 ) can be crushed while being pressurized. Then, the sealing performance between the middle sealing 32 and the outer peripheral surface of the expansion and contraction pipe 20 can be maximized.

The water supply pipe seating part 111 extends from one end to the other end of the socket body 110 by a predetermined length, and has a depth corresponding to the thickness of the branch water supply pipe 30 on the inner circumferential surface of the socket body 110 . is formed stepwise.

The expansion tube stopping protrusion 112 may be formed at a point spaced apart from the middle sealing seat 113 located at a point closest to one end of the socket body 110 toward one end of the socket body 110 . have. And, the expansion pipe stopper 112 is formed to be stepped to a depth smaller than the depression or step depth of the middle sealing seating part 113, and to the outer diameter of the first expansion pipe part 201 of the expansion pipe 20. It may be stepped to have a corresponding diameter.

In addition, the water supply pipe seating portion 111 extends from the edge of the expansion pipe stopper 112 to one end of the socket body 110, and from the expansion pipe stopper 112 to the water supply pipe 30 of It may be formed stepwise to a depth corresponding to the thickness. Accordingly, the water supply pipe 30 may be inserted into the socket body 110 by the length of the water supply pipe seating part 111 .

In addition, the inner sealing 31 is mounted on the expansion tube stopper 112 . In detail, when the expansion and contraction pipe 20 is inserted into the socket body 110 , the inner sealing 31 is pressed in the longitudinal direction of the socket body 110 by the first expansion pipe part 201 , the The inner sealing 31 may be strongly adhered to the outer circumferential surface of the expansion and contraction pipe 20 . Due to the shape deformation of the inner sealing 31 , a phenomenon in which fire water flowing along the water supply pipe 30 leaks into a gap between the socket body 110 and the expansion and contraction pipe 20 may be primarily blocked.

On the other hand, when the expansion and contraction pipe 20 is inserted into the socket body 110 , the middle seals 32 are pressed in the radial direction of the socket body 110 . As a result, the leakage of fire water between the socket body 110 and the expansion and contraction pipe 20 can be blocked secondary.

Meanwhile, the outer sealing seating part 114 formed on the inner circumferential surface of the other end of the socket body 110 may be formed to be stepped to a depth smaller than the step depth of the middle sealing seating part 113 . In addition, the outer seal 33 is seated on the outer seal seating part 114 , so that the leakage of fire water between the socket body 110 and the expansion and contraction pipe 20 can be blocked tertiarily.

In addition, the outer sealing 33 is in close contact with the outer circumferential surface of the second expanded pipe portion 202 of the expansion and contraction pipe 20, blocking direct contact between the second expanded pipe section 201 and the socket body 110 It also functions as a buffer ring. In addition, a phenomenon in which the outer sealing 33 is detached from the socket body 110 by the second expansion tube 201 can be prevented.

2 is a flowchart illustrating a method of manufacturing a connection socket for a sprinkler according to an embodiment of the present invention.

Referring to FIG. 2 , the method of manufacturing a connection socket for a sprinkler according to an embodiment of the present invention includes a pipe compression step ( S10 ), a pipe cutting step ( S20 ), and cutting the inner surface of the cut pipe ( S30 ). may include.

Specifically, in the pipe extrusion step, pipes having predetermined inner and outer diameters are continuously extruded from the extruder.

And, in the pipe cutting step, the extruded pipe is cut by the length of the connection socket 10 .

And, in the inner surface cutting step, the cutting processing tip for forming the water supply pipe seating part 111, the expansion pipe stopper 112, the middle sealing seating part 113, and the outer sealing seating part 114 is the cutting is inserted into the extruded pipe. And, while the cut extruded pipe rotates, the cutting tip moves in the radial direction of the extruded pipe to cut the inner circumferential surface.

As such, by processing the inner circumferential surface of the extruded pipe to form a sealing seat inside the tube, the connection socket 10 may have superior strength and pressure resistance compared to the case of injection molding. In addition, the manufacturing cost of the connection socket 10 is reduced compared to injection molding, and the manufacturing time is also reduced compared to injection molding.

Claims (7)

In the connection socket for a sprinkler in which a water supply pipe is connected to one end, a telescopic pipe is inserted to the other end, and a plurality of seals are fitted on an inner circumferential surface,
The connection socket includes a socket body defined as a cylindrical extruded tube having a predetermined length, an inner diameter, and a thickness,
On the inner peripheral surface of the socket body,
A water supply pipe seating portion on which the water supply pipe is seated, a first expansion pipe portion formed at one end of the expansion and contraction pipe, a stopping protrusion on which the first expansion pipe portion is seated, and a plurality of middle sealing seating portions on which the plurality of seals are mounted are formed. connection socket for sprinklers. The method of claim 1,
The middle sealing seating portion,
It is formed to be recessed or stepped to a predetermined depth from the inner circumferential surface of the socket body,
A connection socket for sprinklers, characterized in that they are spaced apart from each other by a predetermined interval in the longitudinal direction of the socket body. 3. The method of claim 2,
The expansion tube stopper is,
It is formed at a point spaced apart from one end of the socket body by a predetermined distance from the middle sealing seating part located at the closest point to one end of the socket body among the plurality of middle sealing seating parts,
Connection socket for sprinklers, characterized in that the step is shallower than the depth of the depression or the step depth of the middle sealing seating part. 4. The method of claim 3,
The diameter of the expansion pipe stopper is a connection socket for a sprinkler, characterized in that formed in a size corresponding to the outer diameter of the first expansion pipe part. The method of claim 1,
The water supply pipe seating portion,
It is formed in a length from the expansion tube stopper to one end of the socket body,
Sprinkler connection socket, characterized in that it is further stepped from the expansion pipe stopper by a depth corresponding to the thickness of the water supply pipe. The method of claim 1,
A connection socket for a sprinkler, characterized in that the outer sealing seating portion is stepped to a predetermined depth on the inner circumferential surface of the other end of the socket body. Extruding a pipe having a predetermined inner diameter and thickness;
cutting the extruded pipe to a predetermined length; and
Method of manufacturing a connection socket for sprinklers comprising the step of cutting the inner surface of the cut extruded pipe.

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