KR102515967B1 - Pipe connector for service valve - Google Patents

Abstract

The present invention relates to a pipe connection device for a service valve. A nut has a first female screw, which is formed on the inner face of an opening of one side thereof and engaged with a male screw of a valve port. A locking cap is preliminarily engaged with the first female screw of the nut to adjust the insertion depth of the pipe, and then, is disengaged from the nut for subsequent connection to the valve port. The locking cap comprises a cap body, an elastic operating part, a plurality of latches, a boss part, and latch protection parts. The cap body has a cap fastening part provided at the rear of the cap head to be engaged with the first female screw of the nut. The elastic operating part is formed with a first operating piece and a second operating piece intersecting each other, wherein both ends of the first operating piece are fixed to the cap head in a curved form and both ends of the second operating piece are in a free state. The latches are respectively formed on both ends of the second operating piece such that the cap body engages with the nut and fits into the latch grooves of the nut. The boss part is pushed by the front end of the pipe and protrudes from the elastic operating part to separate the latches from the latch grooves. The latch protection parts are formed on the rear surface of the cap head at each outer side of the latches to cover the engagement areas of the latches and the latch grooves. The pipe connection device for a service valve can reduce installation labor and time, thereby enhancing cost-saving effects and maintaining construction quality.

Description

Pipe connector for service valve {Pipe connector for service valve}

The present invention relates to a pipe connecting device for a service valve, and more particularly, to a device used to connect a flare type service valve to a pipe.

In general, when installing an air conditioner, it is necessary to connect the pipes to the union of the service valve of the outdoor unit and the union of the indoor unit using a fastening nut. In the past, the types of piping and service valves were unified and the working method was the same, causing confusion/confusion in the installation work. There was no misuse.

However, in recent years, as various piping materials are used, such as remodeling the shape of a service valve or changing the type of piping from copper to aluminum due to soaring raw material prices and unstable supply and demand for installation materials, confusion is aggravated during installation work and piping materials Since there are frequent cases of misuse, accidents such as gas leakage and pipe breakage are rapidly increasing.

Service valves applied to air conditioners are largely divided into two types: a flare type service valve and a fitting type service valve. The flare type service valve is called a flare type because the end of the valve port fastened with the fastening nut has a tapered inclined surface, and the fastening end of the pipe is flared in a trumpet shape to match the inclined surface of the valve.

According to the prior art, a flare-type service valve must use a copper pipe for the following reasons. Flare processing is easy when the pipe is made of copper. When the pipe is fastened to the valve by the fastening nut, the flare processing part of the pipe must be compressed between the inclined surface of the valve and the inclined surface of the fastening nut to maintain airtightness. This should prevent dissimilar metal corrosion.

When an aluminum pipe is applied and strongly tightened, the flare processing part of the aluminum pipe is pressed against the inclined surface of the valve and the inclined surface of the fastening nut, becoming thin and brittle, so that it cannot withstand high pressure and breaks. In this way, according to the prior art, since an expensive copper pipe must be applied, the cost is significantly higher than that of an aluminum pipe.

Even though air conditioner manufacturers/installers recommend using the provided piping through training, there are cases in which aluminum piping is misused for the purpose of cost reduction in some sites, which causes corrosion, causing gas leakage, piping tearing, and ruptured piping. Escape accidents happen.

In addition, when installing one air conditioner, there are 4 to 6 flare processing parts on average, and the specifications are all different, so it takes a considerable amount of time for non-skilled workers. When inspected after flaring, if the surface roughness and shape are insufficient, there are difficulties such as the operator having to cut the pipe and then repeat reprocessing.

The operator should tighten the tightening nut carefully considering the amount of compression of the pipe, but in the case of an inexperienced person, gas leakage may occur due to weak tightening, or gas leakage may occur again due to the loss of the compressed portion of the pipe due to tightening too strongly. There is a hassle to use the back. Accordingly, there are problems in that time is consumed, cost is high, and workability is deteriorated.

Registered Patent Publication No. 10-1153412 (2011.02.18, published)

An object of the present invention is to provide a pipe connection device for a service valve capable of reducing costs and maintaining construction quality by enabling the application of pipes of various materials.

A pipe connection device for a service valve according to the present invention for achieving the above object is a device for connecting a pipe to a flare-type service valve in which an end of a valve port having a male thread on an outer surface is tapered to form an inclined surface, and includes a bushing And, a nut, an O-ring for a valve, an O-ring for a nut, an O-ring for a pipe, a stop ring, and a cup plunger plunger), washer, and locking cap.

The bushing has a male thread on the outer surface and passes the pipe through the central round hole. The nut has a central circular hole, a first female thread fastened with the male thread of the valve port is formed inside one opening, and a second female thread engaged with the male thread of the bushing is formed inside the other opening, and the inclined surface of the valve port is formed from the inner surface. A protrusion that protrudes and adheres to is formed. O-rings for valves seal between the nut and the valve port. The O-ring for the nut seals between the bushing and the nut. O-rings for piping seal between the bushing and the piping. The stop ring is placed in the nut closer to the tip of the pipe than the O-ring for the pipe to clamp the pipe.

The cup plunger presses the stop ring against the pipe as the valve port is fastened with the nut while the pipe is inserted between the stop ring and the valve port through the central circular hole, and is pushed against the inclined surface of the valve port. The washer is disposed between the stop ring and the O-ring for piping to support the stop ring. The locking cap adjusts the insertion depth of the pipe in a state previously fastened to the first female thread of the nut, and then is disengaged from the nut to allow subsequent fastening of the valve port.

Here, the locking cap includes a cap body, an elastic operation part, latches, a boss part, and latch protection parts. The cap body includes a cap head having a mounting hole formed on a rear surface facing the nut, and a cap fastening portion extending from the rear surface of the cap head to have a hollow shape and having a male screw fastened to the first female screw of the nut on the outer surface thereof. The elastic actuating part is formed in a form in which the first and second actuating pieces intersect and is accommodated in the mounting hole of the cap head, so that both ends of the first actuating element are fixed to the cap head in a curved shape and both ends of the second actuating element are free. is placed as The catches are formed at both ends of the second operating piece so as to fit into the catch grooves of the nut as the cap body is fastened to the nut. The boss portion protrudes from the elastic actuating portion through the hollow of the cap fastening portion to separate the clasps from the clasp grooves while being pushed by the tip of the pipe inserted into the nut. The clasp protectors are formed on the rear surface of the cap head to cover fitting portions of the clasps and the clasp grooves on the outside of each of the clasps.

As an additional aspect, the locking cap may include a stopper protruding from the rear surface of the cap head to prevent over-insertion of the pipe by stopping a front end of the pipe in a state in which the pipe is inserted by a set insertion depth with a nut.

Since the piping connector for service valves according to the present invention has no restrictions on using piping of various materials, it enables the use of inexpensive aluminum piping and enables direct use of the piping without separate flaring in the field, thereby reducing installation man-hours. and time are reduced to increase the effect of cost reduction and to maintain construction quality.

1 is a perspective view showing an example of a service valve to which a pipe connection device for a service valve according to an embodiment of the present invention is applied.
2 is a perspective view of a pipe connection device for a service valve according to an embodiment of the present invention.
Figure 3 is a cross-sectional view of Figure 2;
Figure 4 is an exploded perspective view of Figure 2;
5 is a perspective view showing the rear of the locking cap.
6 is a plan view of the stop ring.
7 to 9 are cross-sectional views illustrating a process of disassembling a locking cap after inserting a pipe into a pipe connecting device for a service valve.
10 and 11 are cross-sectional views illustrating a process of final fastening after provisionally fastening a service valve to a pipe connecting device for a service valve.

The present invention will be described in detail with reference to the accompanying drawings. Here, the same reference numerals are used for the same components, and repeated descriptions and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clarity.

1 is a perspective view showing an example of a service valve to which a pipe connection device for a service valve according to an embodiment of the present invention is applied. 2 is a perspective view of a pipe connection device for a service valve according to an embodiment of the present invention. Figure 3 is a cross-sectional view of Figure 2; Figure 4 is an exploded perspective view of Figure 2; 5 is a perspective view showing the rear of the locking cap.

1 to 5, a pipe connecting device 100 for a service valve according to an embodiment of the present invention is a device for connecting a pipe 20 to a service valve 10, and includes a bushing 110 and a nut. 120, valve o-ring 130, nut o-ring 140, pipe o-ring 150, stop ring 160, cup plunger 170, washer 180, and locking Includes cap 190.

Here, the service valve 10 corresponds to a flare-type service valve in which an end of the valve port 11 having a male thread 11a on an outer surface is tapered to form an inclined surface 11b, as shown in FIG. The service valve 10 is made of copper material. The pipe 20 may be a pipe made of various materials such as copper or aluminum.

The bushing 110 has a male screw 111 on the outer surface and passes the pipe 20 through the central circular hole. The male screw 111 of the bushing 110 is formed to be fastened with the second female screw 122 of the nut 120. When the first female screw 121 of the nut 120 and the male screw 11a of the valve port 11 are formed to be fastened with a right-hand screw (clockwise direction), the second female screw 122 of the nut 120 and the bushing ( The male screw 111 of 110) may be formed to be fastened with a left-hand screw (counterclockwise direction).

When the operator rotates the nut 120 with a tool and fastens it to the valve port 11, the nut 120 and the fixed bushing 110 also rotate together, and the pipe 20 inserted into the bushing 110 is Since it is congested, there is a risk of loosening between the nut 120 and the bushing 110. In order to solve this problem, the second female screw 122 of the nut 120 and the male screw 111 of the bushing 110 can be applied as a left-handed screw.

In addition, the nut 120 may be caulked around the opening 122a of the second female screw 122 to prevent loosening while being fastened to the bushing 110 . In this way, the second female screw 122 of the nut 120 and the male screw 111 of the bushing 110 are applied as left-handed threads to prevent primary loosening between the nut 120 and the bushing 110, and When the second female screw 122 is fastened with the male screw 111 of the bushing 110, the opening periphery 122a is caulked to prevent secondary loosening between the nut 120 and the bushing 110.

The bushing 110 includes a nut 120, a cup plunger 170, a stop ring 160, a washer 180, and a pipe O-ring 150 to fix the inserted pipe 20 and at the same time keep it confidential. make it possible to keep

For example, the bushing 110 may include a bushing step 112 and a bushing inclined portion 113. The bushing step 112 protrudes from the inner surface of the bushing 110 to limit the movement of the washer 180 toward the O-ring 150 for piping. The bushing step 112 serves as a stopper to prevent the washer 180 moving to compress the O-ring 150 for piping from compressing the O-ring 150 for piping more than necessary.

Therefore, the bushing step 112 blocks the phenomenon of being damaged by excessive compression of the pipe O-ring 150, and the soft pipe 20 does not withstand the excessive compression of the pipe O-ring 150 and causes a deformation bottleneck. By preventing this, it is possible to solve the problem of gas leaking from the O-ring 150 for piping.

The bushing inclined portion 113 compresses and deforms the O-ring 150 for the pipe in an inclined form to become narrower as it moves away from the tip of the pipe 20 inside the bushing 110 corresponding to the O-ring 150 for the pipe, so that the pipe ( 20) close. The bushing inclined portion 113 allows the O-ring 150 for piping to flow into a narrow space inclined when the O-ring 150 for piping is compressed, thereby increasing airtightness.

When the O-ring 150 for piping is subjected to high pressure, since it tends to flow more into the narrow space by the inclined portion 113 of the bushing, the sealing force can be further increased. That is, the bushing 110 is configured to proportionally increase the sealing force of the O-ring 150 for piping as the operating pressure increases. The bushing 110 may be made of a plastic material or the like.

The nut 120 has a central circular hole, and a first female screw 121 fastened to the male screw 11a of the valve port 11 is formed on the inside of one opening, and the male screw of the bushing 110 is formed on the inside of the other opening. 111) is formed, and a protruding portion 123 protrudes from the inner surface to the inclined surface 11b of the valve port 11 and is in close contact with it.

The protrusion 123 seals between the nut 120 and the valve port 11 by being pressed against the inclined surface 11b of the valve port 11 in a state in which the valve port 11 and the nut 120 are finally fastened. Therefore, the nut 120 and the valve port 11 are sealed primarily by the O-ring 130 for valves, and the second seal is performed by the protruding portion 123 of the nut 120 and the inclined surface 11b of the valve port 11. By being sealed, it can be sealed with a double sealing structure.

The nut 120 is prepared with the locking cap 190 fastened to the first female screw 121, and when installing the air conditioner, after the locking cap 190 is dismantled, it is fastened to the service valve 10 of the outdoor unit to piping ( 20) to connect. The nut 120 has a hexagonal outer circumference and can be fastened to the service valve 10 with a fastening tool such as a hexagonal wrench. The nut 120 may have a first mounting groove 124 for mounting an O-ring 130 for a valve at a rear end of the first female screw 121 based on the front and rear arrangement of the first and second female screws 121 and 122. . The protrusion 123 may protrude from the rear periphery of the first mounting groove 124 to the inclined surface 11b of the valve port 11 .

The nut 120 may have a second mounting groove 125 for mounting the nut O-ring 140 at the front end of the second female screw 122 . The nut 120 may have a receiving groove 126 accommodating the stop ring 160 and the plunger inclined portion 174 of the cup plunger 170 in a state formed through the second mounting groove 125 . The nut 120 is made of a copper material.

The valve O-ring 130 seals between the nut 120 and the valve port 11 . The O-ring 130 for the valve is compressed and deformed by being pushed into the first mounting groove 124 by the valve port 11 fastened to the nut 120 while being fitted into the first mounting groove 124 of the nut 120, It is possible to secure airtightness between the nut 120 and the valve port 11. The valve O-ring 130 may be made of a sealing material such as rubber.

The O-ring 140 for the nut seals between the bushing 110 and the nut 120. The O-ring 140 for the nut is compressed and deformed by being pushed into the second mounting groove 125 by the bushing 110 fastened to the nut 120 while being fitted into the second mounting groove 125 of the nut 120. It is possible to secure the airtightness between the 110 and the nut 120. The O-ring 140 for the nut may be made of a sealing material such as rubber.

The pipe O-ring 150 seals between the bushing 110 and the pipe 20. The pipe O-ring 150 is disposed in the bushing 110 and moves along the coupling between the nut 120 and the valve port 11 in the state where the pipe 20 is inserted in the center hole, and the bushing inclined portion is moved by the washer 180 By being pushed and compressed by 113, it is possible to secure airtightness between the bushing 110 and the pipe 20. Two O-rings 150 for pipes may be provided in consideration of a normal safety range to seal between the bushing 110 and the pipe 20 . The O-ring 150 for piping may be made of a sealing material such as rubber.

The stop ring 160 is disposed in the nut 120 closer to the tip of the pipe 20 than the O-ring 150 for the pipe to clamp the pipe 20. The stop ring 160 is positioned between the cup plunger 170 and the washer 180 and allows the pipe 20 to be forcibly clamped according to the engagement between the valve port 11 and the nut 120.

For example, the stop ring 160 may include a ring rim 161 and hook portions 162 arranged at equal intervals along the inner circumference of the ring rim 161 but inclined toward the cup plunger 170, respectively. The inclination angles of the hook parts 162 are set to be aligned and corrected by the plunger inclination part 174 of the cup plunger 170 at the point in time when the pipe 20 is fastened. In the stop ring 160 , holes may be formed at each bending boundary of the hook parts 162 . The stop ring 160 may be made of a metal material.

When a high pressure is applied to the pipe 20 inserted into the stop ring 160, it tends to be separated in the opposite direction to the insertion direction. At this time, the hook parts 162 on the inside of the stop ring 160 are loaded in the direction of separation of the pipe 20, and the ring rim 161 on the outside of the stop ring 160 is supported by the washer 180 As a load is applied in the insertion direction of the pipe 20, it is possible to prevent the pipe 20 from being separated.

In this way, opposite forces are applied to the stop ring 160 inwardly and outwardly, and as a result, the stop ring 160 tends to widen in a radial form. In the stop ring 160 of this embodiment, since the ring rim 161 has a circular band shape with a certain width, even when opposite forces are applied to the inside and outside, the ring rim 161 maintains the circular band shape to form a radial shape. to prevent widening. As a result, the effect of preventing separation of the pipe 20 may be increased.

The cup plunger 170 is formed between the stop ring 160 and the valve port 11 as the valve port 11 is fastened with the nut 120 while the pipe 20 is inserted through the central circular hole. The stop ring 160 is pushed to the inclined surface 11b of ) to bring it into close contact with the pipe 20.

For example, the cup plunger 170 may include a central body portion 171 , an inclined step portion 172 , a plunger contact portion 173 , and a plunger inclined portion 174 . The central body portion 171 inserts the pipe 20 in close contact. The inclined stepped portion 172 extends in a tapered form from the front end of the central body portion 171 so as to engage the front end of the pipe 20 . The inclined stepped portion 172 serves as a stopper so that only a necessary amount is inserted without additional insertion when the pipe 20 is inserted. In addition, the inclined step portion 172 wraps and protects the front end of the pipe 20 so that the raw material and the resin coating layer do not lift when the resin-coated pipe 20 is used.

The plunger contact portion 173 extends from the inclined step portion 172 and contacts the inclined surface 11b of the valve port 11 . The plunger inclined portion 174 extends from the rear end of the central body portion 171 in an extended form to press the hook portions 162 into the pipe. The cup plunger 170 may be made of a plastic material or the like.

When the service valve 10 and the nut 120 are fastened, the cup plunger 170 comes into contact with the inclined surface 11b of the valve port 11 after the plunger contact portion 173 contacts the stop ring 160 by the valve port 11. ) will move in the direction Accordingly, the cup plunger 170 enables the plunger inclined portion 174 to firmly correct the hook portions 162 of the stop ring 160 that are deformed when the pipe 20 is inserted and return to a normal state.

At the same time, the cup plunger 170 pushes the stop ring 160 and the washer 180 together in the direction of the pipe O-ring 150 so that the plunger inclined portion 174 compresses the pipe 20. It is possible to improve the sealing power of the O-ring 150 for piping surrounding the piping.

The washer 180 is disposed between the stop ring 160 and the O-ring 150 for a pipe to support the stop ring 160. The washer 180 supports the stop ring 160 to prevent deformation of the stop ring 160 due to physical force applied to the stop ring 160 fixing the high-pressure pipe 20 . The washer 180 serves as a back-up ring when the O-ring 150 for piping is compressed, so that the O-ring 150 for piping 150 can withstand high pressure without being deformed.

In addition, the washer 180 comes into close contact with the cup plunger 170 and the stop ring 160 as the valve port 11 is fastened to the nut 120 and compresses the O-ring 150 for piping. By being caught on the bushing step 112 and stopped, it is possible to correct a certain amount of compression by preventing excessive compression of the O-ring 150 for piping. The washer 180 may be made of a metal material.

Meanwhile, the ring rim 161 of the stop ring 160 may be disposed within the bushing 110. The ring rim 161 may be accommodated in the bushing 110 in a state in which the outer circumferential surface is in contact with the inner circumferential surface of the bushing 110 . In addition, the nut 120 may include a step 125a formed adjacent to the front end of the bushing 110 toward the cup plunger 170 and facing the ring rim 161 . The step 125a may protrude into the bushing 110 along the circumferential direction at the boundary between the second mounting groove 125 and the receiving groove 126 .

As an additional aspect, a backup washer 186 may be disposed between the ring rim 161 and the step 125a of the nut 120 in the form of supporting the entire front surface of the ring rim 161 . The backup washer 186 may have an outer diameter equal to that of the ring rim 161 and an inner diameter smaller than the inner diameter of the ring rim 161 . Therefore, the backup washer 186 has a width wider than that of the ring rim 161, and can be supported from the ring rim 161 to the ring rim 161 and the hook portion 162 across the bent boundary.

As shown in FIG. 7, when the pipe 20 is inserted into the bushing 110, the stop ring 160 may be deflected in the insertion direction of the pipe 20, and the backup washer 186 It is possible to prevent excessive deformation of the stop ring 160.

Since the hook portion 162 of the stop ring 160 has a smaller diameter than the pipe 20, when the pipe 20 is forcibly inserted, the stop ring 160 may deflect in the insertion direction of the pipe 20. there is. The stop ring 160 and the hook portion 162 deformed due to this may interfere with the plunger inclination portion 174, making it difficult to insert the pipe 20. It may be provided to support the entire bottom surface of (160).

That is, the backup washer 186 serves to minimize the shape change of the stop ring 160 when the pipe 20 is forcibly inserted by supporting the ring rim 161 section of the stop ring 160 as a whole.

10 and 11, after the pipe 20 is inserted into the stop ring 160, the first female screw 121 of the nut 120 is attached to the male screw 11a of the valve port 11 In order to couple, the nut 120 is rotated clockwise to tighten. The nut 120 is a rotating body, and the stop ring 160 inserted into the pipe 20 is a fixed body, and the contact surface slides. In this process, the hole portion of the bent boundary of the hook parts 162 wears the step 125a of the nut 120, resulting in metal dust, and excessive damage to the pipe 20 due to the rotation of the stop ring 160 as well. Since damage may occur, a backup washer 186 may be provided to eliminate this.

That is, the backup washer 186 is inserted between the rotating nut 120 and the fixed stop ring 160 to induce smooth rotation of the nut 120 and prevent the generation of metal dust due to wear.

The locking cap 190 is pre-fastened to the first female screw 121 of the nut 120, and after adjusting the insertion depth of the pipe 20, it is disengaged from the nut 120, and the subsequent fastening of the valve port 11 make it happen The locking cap 190 is fastened to the nut 120 prior to use of the pipe connector 100 for the service valve in a state in which the main parts are assembled in the nut 120, so that the main parts in the nut 120 are contaminated and damaged to protect it from happening.

The locking cap 190 is configured to be disengaged from the nut 120 only when the pipe 20 is inserted into the nut 120 to a normal depth while being fastened to the nut 120 . Therefore, since the operator cannot arbitrarily dismantle the locking cap 190 without the normal insertion of the pipe 20, the insertion depth of the pipe 20 into the nut 120 can be easily adjusted under the guidance of the locking cap 190. can That is, the locking cap 190 can provide information about whether the pipe 20 is normally inserted into the nut 120 to the operator.

The locking cap 190 includes a cap body 191, an elastic operation part 194, clasps 195, a boss part 196, and clasp protection parts 197.

The cap body 191 includes a cap head 192 and a cap fastening part 193 . A mounting hole 192a is formed on the rear surface of the cap head 192 facing the nut 120 . The mounting hole 192a of the cap head 192 is for installing the elastic operating part 194. The mounting hole 192a has a size capable of permitting forward and backward movement of the elastic actuating part 194 while accommodating the elastic actuating part 194 . The mounting hole 192a may be formed through a cross shape from the rear surface of the cap head 192 .

The cap fastening part 193 has a hollow extension from the rear surface of the cap head 192, and a male screw 193a fastened with the first female screw 121 of the nut 120 is formed on the outer surface. The cap fastening part 193 may be divided into four parts by omitting a portion corresponding to the mounting hole 192a and screwed to the nut 120 . The hollow of the cap fastening part 193 communicates with the mounting hole 192a of the cap head 192 . Accordingly, the boss portion 196 may protrude from the elastic actuating portion 194 through the hollow of the cap fastening portion 193 .

The elastic actuating part 194 has a shape in which the first actuating piece 194a and the second actuating piece 194b cross each other, and is accommodated in the mounting hole 192a of the cap head 192. The elastic actuating part 194 may be formed in a cross shape where the first and second actuating pieces 194a and 194b cross at 90 degrees, and may be disposed corresponding to the cross-shaped mounting hole 192a. The first and second operating pieces 194a and 194b may have a constant width and thickness. The first and second operating pieces 194a and 194b have a width capable of smoothly operating within the mounting hole 192a.

In the elastic actuating part 194, both ends of the first actuating piece 194a are bent and fixed to the cap head 192, and both ends of the second actuating piece 194b are placed in a free state. Both ends of the first operating piece 194a are fixed to the outside of the mounting hole 192a in a convexly curved shape, and both ends of the second operating piece 194b are free to the outside of the mounting hole 192a. can be placed

When a force is applied forward to the center of the elastic actuating unit 194, the fixed ends of the first actuating piece 194a are simultaneously elastically deformed and the free ends of the second actuating piece 194b move forward at the same time. When the applied force is removed, the elastic restoring force acting on the fixed ends of the first actuating piece 194a causes the free ends of the second actuating piece 194b to simultaneously return to the rear. As the free ends of the second operating piece 194b move in the forward and backward directions at the same time, the clasps 195 of the second operating piece 194b also operate at the same time. The elastic operating unit 194 may be integrally formed with the cap body 191 .

The clasps 195 are formed at both ends of the second operating piece to fit into the clasp grooves 127 of the nut 120 as the cap body 191 is fastened to the nut 120 . The latch grooves 127 may be arranged at equal intervals in the circumferential direction on the outer surface of the nut 120 . Each latching groove 127 may be concavely formed with a predetermined width from the front end of the nut 120 . The number of clasp grooves 127 into which the clasps 195 can be inserted regardless of the rotational position of the cap body 191 may be provided, for example, six.

The clasp 195 may be formed in an inclined shape to become thicker as the cap body 191 is dismantled. Accordingly, when the cap body 191 is fastened to the nut 120, the clasps 195 smoothly pass through the clasp grooves 127 and can be inserted into the corresponding clasp grooves 127 at the time of final fastening. In this state, the clasps 195 are caught in the clasp grooves 127 when the cap body 191 rotates in the disassembly direction, thereby preventing the disassembly of the cap body 191. The clasps 195 may be integrally molded with the elastic actuating part 194 or may be separately molded and attached to the elastic actuating part 194 .

The boss portion 196 is pushed by the front end of the pipe 20 inserted into the nut 120 to separate the clasps 195 from the clasp grooves 127 so as to separate the cap fastening portion 193 from the elastic actuating portion 194. protrudes through the hollow of

The boss portion 196 may be formed in a shape in which the first boss 196a and the second boss 196b intersect at 90 degrees, that is, in the shape of a cross, and may be positioned to correspond to the elastic actuating portion 194 in the shape of a cross. In the boss part 196, the center of intersection of the first and second bosses 196a and 196b coincides with the center of intersection of the first and second actuating pieces 194a and 194b, and the first boss 196a is the first actuating member 196a. The piece 194a protrudes to face the front end of the pipe 20, and the second boss 196b may protrude from the second operation piece 194b to face the front end of the pipe 20. The boss portion 196 has a structure that evenly receives the force applied from the pipe 20, and is an optimal shape for operation balance. Accordingly, the boss portion 196 allows the pair of clasps 195 to be simultaneously separated during operation. The boss part 196 may be integrally molded with the elastic actuating part 194 .

When the boss part 196 comes into contact with the front end of the pipe 20 inserted into the nut 120 and is pushed out, the elastic operating part 194 is pushed forward. Accordingly, as the free ends of the second operating pieces of the elastic actuating part 194 move forward, the clasps 195 may be simultaneously separated from the corresponding clasp grooves 127 .

The clasp protection parts 197 are formed on the rear surface of the cap head 192 to cover fitting portions of the clasps 195 and the clasp grooves 127 on the outside of each of the clasps 195 . The clasp protection parts 197 may protrude from the outer surface of the rear surface of the cap head 192 to cover the outside of the clasps 195 . The clasp protection parts 197 may be integrally molded with the cap head 192 . The clasp protection parts 197 block the operator from separating the clasps 195 from the clasp grooves 127 by directly manipulating the clasps 195 . Therefore, the clasp protectors 197 prevent the worker from dismantling the locking cap 190 arbitrarily without the normal insertion of the pipe 20 .

As a further aspect, the locking cap 190 may include a stopper portion 198 . The stopper part 198 stops the front end of the pipe 20 in a state where the pipe 20 is inserted by the set insertion depth with the nut 120 to prevent over-insertion of the pipe 20 from the rear surface of the cap head 192. protrudes out The stopper portion 198 may be formed at four locations corresponding to the four locations of the cap fastening portion 193, respectively. The stopper portion 198 may be integrally formed with the cap head 192 and the cap fastening portion 193 .

When the pipe 20 is inserted into the nut 120 by the set insertion depth, the stopper portion 198 stops the pipe 20 by abutting the protruding end of the stopper portion 198 with the tip of the pipe 20, thereby preventing the pipe ( 20) to prevent excessive insertion. The stopper part 198 serves to prepare for various situations by assisting the inclined stepped part 172 that serves as a stopper so that only the necessary amount of the pipe 20 is inserted. Parts of the aforementioned locking cap 190 may be made of a plastic material or the like. The locking cap 190 may be composed of one injection-molded product.

The process of connecting the pipe 20 to the service valve 10 by the pipe connecting device 100 for the service valve having the above configuration will be described with reference to FIGS. 7 to 11 together with FIGS. 2 and 3. Same as Here, Figures 7 to 9 are cross-sectional views for explaining a process of disassembling the locking cap after inserting the pipe into the pipe connecting device for the service valve. 10 and 11 are cross-sectional views illustrating a process of final fastening after provisionally fastening a service valve to a pipe connecting device for a service valve.

First, as shown in FIGS. 2 and 3, the O-ring 130 for the valve is mounted in the first mounting groove 124 of the nut 120, and the O-ring 140 for the nut is mounted on the second mounting groove 124 of the nut 120. It is mounted in the mounting groove 125. Cup plunger 170, stop ring 160 and washer 180 are inserted into nut 120 in turn. Here, in the cup plunger 170, the plunger contact portion 173 passes through the protruding portion 123 of the nut 120 and is positioned close to the valve O-ring 130, and the plunger inclination portion 174 is the receiving groove of the nut 120. (126). The stop ring 160 is positioned in the receiving groove 126 of the nut 120 together with the washer 180 with the hook portions 162 facing the plunger inclined portion 174.

In this state, the bushing 110 is fastened to the second female screw 122 of the nut 120 with the O-rings 150 for piping inserted therein. When the bushing 110 is finally fastened to the nut 120, the O-ring 140 for the nut is pushed into the second mounting groove 125 by the tip of the bushing 110 and is compressed and deformed, so that the bushing 110 and the nut 120 Ensure confidentiality between

Also, the locking cap 190 is fastened to the first female screw 121 of the nut 120. When the locking cap 190 is finally fastened to the nut 120, the locking cap 195 is prevented from rotating in the disassembly direction of the locking cap 190 in a state in which the locking cap 195 is inserted into the corresponding locking grooves 127 of the nut 120, respectively. In addition, the locking cap 190 blocks the clasp protectors 197 from separating the clasp grooves 127 by directly manipulating the clasps 195 by covering the outside of the clasps 195 .

In this process, in a state in which the pipe connection device 100 for the service valve is prepared, as shown in FIG. 7, the pipe 20 is inserted. Since the pipe 20 is inserted by a certain amount past the stop ring 160, the level of incomplete insertion has already been resolved. Nevertheless, since the pipe 2 is before pushing the boss portion 196 of the locking cap 190, the elastic actuating portion 194 is in a state in which the operation is not made, and thus the latch 195 is in the latch groove 127 ) remain locked.

In this way, the pipe 20 is inserted to the level where it is not separated from the stop ring 160, but since the catches 195 are still locked in the catch grooves 127, the operator is required to insert the additional pipe 20. is in a state of That is, a structural interlock is formed in which the locking cap 190 can be removed only when the pipe 20 is completely inserted.

Then, as shown in FIG. 8 , the pipe 20 is inserted through the bushing 110 until the front end is caught on the inclined step 172 of the cup plunger 170 . When using the resin-coated pipe 20, the inclined step 172 may wrap and protect the front end of the pipe 20 so that the raw material and the resin coating layer do not float.

In this process, the locking cap 190 pushes the elastic operating part 194 while the boss part 196 is pushed by the front end of the pipe 20, so that the latches 195 are released from the corresponding latch grooves 127. It is separated to allow the cap body 191 to rotate in the disassembly direction. In addition, the front end of the pipe 20 is stopped by being caught by the inclined step 172 and the stopper 198 of the locking cap 190 at the same time, and accordingly, the pipe 2 is inserted only to the set insertion depth without over-insertion, and the nut Assembly to (120) is complete.

In this way, when the insertion of the pipe 20 is completed, the safe insertion amount A of the pipe 20 is unconditionally secured, and the service valve 10 operates under the condition that the safe insertion amount A of the pipe 20 is secured. Separation of the locking cap 190 for subsequent fastening to is possible.

In this state, as shown in FIG. 9, when the locking cap 190 is finally disassembled from the nut 120, the nut 120 opens the service valve 10 with the pipe 20 inserted to a normal depth. ready to conclude

In this process, in a state where the locking cap 190 is separated from the nut 120 and prepared, as shown in FIG. 10, the valve port 11 of the service valve 10 is manually screwed into the first female screw of the nut 120 (121) is provisionally fastened. Pre-tightening between the valve port 11 and the nut 120 is performed until the inclined surface 11b of the valve port 11 comes into contact with the valve O-ring 130 and the plunger contact portion 173 of the cup plunger 170.

In this state, as shown in FIG. 11 , the valve port 11 is finally fastened to the nut 120 by a fastening tool. Then, the valve O-ring 10 is pushed into the first mounting groove 124 by the valve port 11 and is compressed and deformed to perform primary sealing, and the inclined surface 11b of the valve port 11 is the nut 120. By being pressed against the protruding portion 123 for secondary sealing, airtightness between the valve port 11 and the nut 120 is achieved in a double sealing structure.

The cup plunger 170 moves in the direction of the stop ring 160 as the plunger contact portion 173 is pushed by the inclined surface 11b of the valve port 11 . Accordingly, the plunger inclined portion 174 surrounds the hook portions 162 of the stop ring 160, which are deformed when the pipe 20 is inserted, and firmly corrects them to a normal state again. The stop ring 160 firmly clamps the pipe 20 without separation with the opposite force applied to the inside and outside while suppressing the radial widening by the ring rim 161.

At the same time, the plunger inclined portion 174 pushes the stop ring 160 and the washer 180 together toward the pipe O-ring 150 to compress the pipe O-rings 150. The washer 180 is caught and stopped by the bushing step 112 while supporting the stop ring 160, thereby preventing excessive compression of the O-ring 150 for piping. The O-rings 150 for the pipe are compressed and deformed by being pushed into a narrow space by the inclined portion 113 of the bushing, so that a high air tightness can be maintained between the pipe 20 and the bushing 110.

In this way, since the pipe connecting device 100 for the service valve of the present embodiment has no restrictions on using the pipe 10 of various materials, it is possible to use inexpensive aluminum pipe, and the pipe (without separate flaring processing in the field) 10) can be used right away, reducing installation man-hours and time, increasing cost reduction, and maintaining construction quality.

The present invention has been described with reference to an embodiment shown in the accompanying drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. You will be able to. Therefore, the true protection scope of the present invention should be defined only by the appended claims.

10..service valve 11..valve port
11b..slope 20..piping
100..pipe connections for service valves
110.. bushing 112.. bushing stepped
113.. Bushing slope 120.. Nut
121.. 1st female thread 122.. 2nd female thread
123.. protrusion 127.. latch groove
130.. O-ring for valve 140.. O-ring for nut
150.. O-ring for piping 160.. Stop ring
161. Ring rim 162.. Hook part
170.. Cup plunger 171.. Central body part
172.. Inclined step part 173.. Plunger contact part
174. plunger inclination 180.. washer
186..back-up washer 190..locking cap
191.. cap body 192.. cap head
193.. Cap fastening part 194.. Elastic operating part
195.. clasp 196.. boss part
197.. Catch protection part 198.. Stopper part

Claims (6)

A device for connecting a pipe to a flare-type service valve in which an end of a valve port having a male thread on an outer surface is tapered to form an inclined surface,
A bushing having a male screw on an outer surface and passing a pipe through a central circular hole;
It has a central circular hole, a first female screw fastened to the male screw of the valve port is formed on the inside of one opening, and a second female screw fastened to the male screw of the bushing is formed on the inside of the other opening, extending from the inner surface to the inclined surface of the valve port. A nut formed with a protruding portion that protrudes and adheres to;
an O-ring for a valve that seals between the nut and the valve port;
an O-ring for a nut that seals between the bushing and the nut;
an O-ring for a pipe that seals between the bushing and the pipe;
a stop ring disposed in the nut closer to the tip of the pipe than the O-ring for the pipe to clamp the pipe;
a cup plunger pushing the stop ring to the pipe by pushing against an inclined surface of the valve port as the valve port is fastened to the nut while the pipe is inserted through the central circular hole between the stop ring and the valve port;
a washer disposed between the stop ring and the O-ring for a pipe to support the stop ring; and
A locking cap that is pre-fastened to the first female screw of the nut to match the insertion depth of the pipe and then disengaged from the nut so that the valve port is subsequently fastened,
The locking cap,
a cap body including a cap head having a mounting hole formed on a rear surface facing the nut, and a cap fastening part extending from the rear surface of the cap head to have a hollow shape and having a male screw fastened to the first female screw of the nut on the outer surface thereof;
The first operating piece and the second operating piece are formed in a cross shape and are accommodated in the mounting hole of the cap head, so that both ends of the first operating piece are fixed to the cap head in a curved shape, and both ends of the second operating piece are free. an elastic actuating unit placed in a state;
clasps respectively formed at both ends of the second operating piece to be inserted into the latch grooves of the nut as the cap body is fastened to the nut;
a boss protruding from the elastic actuating part through the hollow of the cap fastening part to separate the latches from the latch grooves while being pushed by the front end of the pipe inserted into the nut; and
clasp protection parts formed on a rear surface of the cap head to cover fitting portions of the clasps and the clasp grooves on the outside of each of the clasps;
Piping connector for service valves including a.
According to claim 1,
The locking cap,
A pipe connecting device for service valves comprising a stopper protruding from the rear surface of the cap head to prevent over-insertion of the pipe by stopping the tip of the pipe in a state in which the pipe is inserted by the set insertion depth with the nut.
According to claim 1,
The stop ring,
a ring rim, and hook portions arranged at equal intervals along an inner circumference of the ring rim and each inclined toward the cup plunger;
The cup plunger,
A central body portion that fits the pipe in close contact, a slanted stepped portion that extends in a tapered form from the tip of the central body portion to engage the pipe tip, and a plunger contact portion that extends from the inclined stepped portion and contacts the inclined surface of the valve port , and a plunger inclined portion extending from the rear end of the central body portion in an extended form to press the hook portions into the pipe.
According to claim 3,
a ring rim of the stop ring is disposed within the bushing;
the nut includes a step formed adjacent to the tip of the bushing facing the cup plunger and facing the ring rim;
Piping connection device for a service valve, characterized in that it comprises a backup washer disposed between the step of the ring rim and the nut in the form of supporting the entire front surface of the ring rim.
According to claim 1,
The first female thread of the nut and the male thread of the valve port are formed to be fastened as a right-hand thread, and the second female thread of the nut and the male thread of the bushing are formed as a left-hand thread;
The nut is caulked around the opening of the second female screw to prevent loosening while being fastened to the bushing.
According to claim 1,
The bushing,
A bushing step protruding from the inner surface to limit the movement of the washer toward the O-ring for the pipe;
A pipe connecting device for a service valve, characterized in that it includes a bushing inclined portion corresponding to the O-ring for the pipe, which compresses and deforms the O-ring for the pipe in a form inclined to become narrower as it moves away from the pipe end and adheres to the pipe.

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