KR20230111773A - Pipe connector for service valve - Google Patents

Abstract

A pipe connecting device for a service valve according to the present invention is a device for connecting a pipe to a flare type service valve. 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 screw fastened to the male screw of the valve port is formed inside one opening, and a second female screw fastened to the male screw of the bushing is formed inside the other opening, and a protrusion protruding from the inner surface to the inclined surface of the valve port to be in close contact 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.

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, pipe connection work is performed using a fastening nut to the service valve of the outdoor unit and the union of the indoor unit.

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. Since there are frequent cases of misuse of piping materials, accidents such as gas leakage and pipe separation 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, since the flared part of the pipe is compressed between the inclined surface of the valve and the inclined surface of the fastening nut to maintain airtightness, a copper pipe made of the same material as the valve and fastening nut made of copper must be applied to 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 cost reduction purposes in some sites, and this causes corrosion, resulting in gas leaks, pipe tearing and breakage, resulting in pipe breakaway accidents.

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 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 tightening too strongly, and gas leakage may occur again due to loss of the compressed portion of the pipe. 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.

In order to achieve the above object, a pipe connecting device for a service valve according to the present invention 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, 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, It includes a washer, and a 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 screw fastened to the male screw of the valve port is formed inside one opening, and a second female screw fastened to the male screw of the bushing is formed inside the other opening, and a protrusion protruding from the inner surface to the inclined surface of the valve port to be in close contact 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 stop ring may include a ring rim and hook portions that are arranged at equal intervals along the inner circumference of the ring rim and are each inclined toward the cup plunger. In addition, the cup plunger may include a central body portion that inserts the pipe in close contact, an inclined stepped portion extending from the tip of the central body portion in a tapered form so as to engage the tip of the pipe, a plunger contact portion extending from the inclined stepped portion and contacting 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.

Here, the bushing may include a bushing step protruding from the inner surface to limit the movement of the washer toward the pipe O-ring, and a bushing inclined portion that compresses and deforms the pipe O-ring in an inclined form to become narrower as it moves away from the pipe tip on the inner side corresponding to the pipe O-ring and adheres to the pipe.

Here, the locking cap may include a cap body, a pair of elastic operating parts, latches, bosses, 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 part extending from the rear surface of the cap head in a hollow cylindrical shape and having a male screw fastened to the first female screw of the nut on the outer surface. A pair of elastic actuating parts are accommodated in the mounting hole of the cap head so that one end is fixed to the cap head and the other end is placed in a free state.

The catches are formed at free ends of the elastic actuating parts, respectively, so as to fit into the lock grooves of the nut as the cap body is fastened to the nut. The bosses protrude from the elastic actuating parts through the hollow of the cap fastening part so as to separate the clasps from the clasp groove 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.

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 allows the piping to be used immediately without separate flaring in the field, thereby reducing installation man-hours and time, thereby increasing cost reduction and maintaining 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 and 8 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.
9 and 10 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; 4 is an exploded perspective view of FIG. 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, a nut 120, a valve O-ring 130, a nut O-ring 140, a pipe O-ring 150, a stop ring 160, a cup plunger 170, and A sher 180 and a locking cap 190 are included.

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. The bushing 110 includes a nut 120, a cup plunger 170, a stop ring 160, a washer 180, and an O-ring 150 for a pipe to fix the inserted pipe 20 and maintain airtightness at the same time.

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 prevents the O-ring 150 for piping from being damaged due to excessive compression, and prevents the soft piping 20 from being unable to withstand the over-compression of the O-ring 150 for piping and causing a deformation bottleneck, thereby solving the problem of leaking gas from the O-ring 150 for piping.

The bushing inclination part 113 compresses and deforms the O-ring 150 for pipe in a form inclined to become narrower as it moves away from the front end of the pipe 20 on the inside of the bushing 110 corresponding to the pipe O-ring 150, and adheres to the pipe 20. 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, a first female screw 121 fastened with the male screw 11a of the valve port 11 is formed inside one opening, and a second female screw 122 fastened with the male screw 111 of the bushing 110 is formed inside the other opening, and a protrusion 123 protruding from the inner surface to the inclined surface 11b of the valve port 11 to be in close contact is formed. .

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 primarily sealed by the valve O-ring 130, and are secondarily sealed 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 in a double sealing structure.

The nut 120 is prepared with the locking cap 190 fastened to the first female screw 121, and when the air conditioner is installed, after the locking cap 190 is dismantled, it is fastened to the service valve 10 of the outdoor unit to connect the pipe 20. 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 the O-ring 130 for a valve at the 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 a valve is pushed into the first mounting groove 124 by the valve port 11 fastened to the nut 120 in a state of being fitted into the first mounting groove 124 of the nut 120, and is compressed and deformed, thereby ensuring 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 pushed into the second mounting groove 125 by the bushing 110 fastened to the nut 120 in a state of being fitted into the second mounting groove 125 of the nut 120 and is compressed and deformed, thereby ensuring airtightness between the bushing 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 O-ring 150 for the pipe is disposed in the bushing 110 and is compressed and deformed by the washer 180 moving according to the fastening between the nut 120 and the valve port 11 in the state where the pipe 20 is inserted in the central hole, and is pushed to the inclined portion 113 of the bushing, thereby ensuring 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, which are inside the stop ring 160, are loaded in the direction of separation of the pipe 20, and the ring rim 161, which is outside the stop ring 160, is supported by the washer 180, and the load is applied in the insertion direction of the pipe 20, thereby preventing the pipe 20 from coming off.

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 edge 161 is formed in a circular band shape having a certain width, even when opposite forces are applied to the inside and outside, the ring edge 161 maintains the circular belt shape. It is possible to suppress the radial widening. As a result, the effect of preventing separation of the pipe 20 may be increased.

The cup plunger 170 is pushed against the inclined surface 11b of 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 between the stop ring 160 and the valve port 11, thereby bringing the stop ring 160 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 metal or plastic material.

The cup plunger 170 moves toward the stop ring 160 by the valve port 11 after the plunger contact portion 173 contacts the inclined surface 11b of the valve port 11 when the service valve 10 and the nut 120 are fastened. 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, in the cup plunger 170, the plunger inclined portion 174 pushes the stop ring 160 and the washer 180 together in the direction of the O-ring 150 for the pipe to compress the O-ring 150 for the pipe 20, thereby improving the sealing force of the O-ring 150 for the pipe surrounding the pipe 20.

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, as the valve port 11 is fastened to the nut 120, the washer 180 comes into close contact with the cup plunger 170 and the stop ring 160 to compress the pipe O-ring 150. In this process, the washer 180 is caught on the bushing step 112 and stopped, thereby preventing excessive compression of the pipe O-ring 150 and correcting a certain amount of compression. The washer 180 may be made of a metal material.

The locking cap 190 is pre-fastened to the first female screw 121 of the nut 120, adjusts the insertion depth of the pipe 20, and then is dismantled from the nut 120 so that the valve port 11 is subsequently fastened. 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. It is possible to protect it from being damaged.

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. That is, the locking cap 190 can provide information about whether the pipe 20 is normally inserted into the nut 120 to the operator.

For example, the locking cap 190 may include a cap body 191, a pair of elastic operating parts 194, clasps 195, bosses 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 actuating parts 194 . The mounting hole 192a has a size capable of permitting forward and backward movement of the elastic actuating parts 194 while accommodating the elastic actuating parts 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 extends from the rear surface of the cap head 192 in a hollow cylindrical shape and has a male screw 193a fastened to the first female screw 121 of the nut 120 on the outer surface. The hollow of the cap fastening part 193 communicates with the mounting hole 192a of the cap head 192 . Accordingly, the boss portions 196 may protrude from the elastic operating portions 194 through the hollow of the cap fastening portion 193 .

The pair of elastic operating parts 194 are accommodated in the mounting hole 192a of the cap head 192 so that one end is fixed to the cap head 192 and the other end is placed in a free state. The elastic operating units 194 operate so that when a force is applied to the center forward, the fixed end is elastically deformed and the free end moves forward, and then, when the force applied to the center is removed, the free end returns to the rear by the elastic restoring force of the fixed end.

The elastic actuating part 194 is bent at 90 degrees so that one end is fixed to the outside of the mounting hole 192a and the other end can be freely placed outside the mounting hole 192a. The elastic actuating parts 194 may be disposed so that fixed ends form an angle of 180 degrees and free ends form an angle of 180 degrees with each other.

As the cap body 191 is fastened to the nut 120, the clasps 195 are formed at free ends of the elastic operation parts 194 so as to fit into the clasp grooves 127 of 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 separately molded and attached to the elastic actuating parts 194 or may be integrally molded with the elastic actuating parts 194 .

The bosses 196 are pushed by the front end of the pipe 20 inserted into the nut 120 to separate the clasps 195 from the clasp groove 127 from the elastic actuating parts 194. Protrude through the hollow of the cap fastening part 193. The bosses 196 may be positioned facing the front end of the pipe 20 at the center of the elastic actuating parts 194 . The bosses 196 may be integrally molded with the elastic actuating parts 194 .

When the bosses 196 come into contact with the tip of the pipe 20 inserted into the nut 120 and are pushed out, the elastic actuating parts 194 are pushed forward. Accordingly, as the free end of the elastic operating unit 194 moves forward, the clasps 195 may be 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 . Parts of the locking cap 190 may be made of a plastic material or the like.

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 10 together with FIGS. 2 and 3 . Here, Figures 7 and 8 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. 9 and 10 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 the second mounting groove 125 of the nut 120. 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 inclined portion 174 is located in the receiving groove 126 of the nut 120. 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 compressed and deformed, thereby securing the airtightness between the bushing 110 and the nut 120.

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 protection parts 197 from being separated from the clasp grooves 127 by directly manipulating the clasps 195 by having the outside of the clasps 195 .

In the state in which the pipe connector 100 for the service valve is prepared in this process, as shown in FIG. 7, the pipe 20 is inserted through the bushing 110 until the tip 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 operation parts 194 while the boss parts 196 are pushed by the front end of the pipe 20, and accordingly, the latches 195 are separated from the corresponding latch grooves 127 and allow the cap body 191 to rotate in the disassembly direction.

In this state, as shown in FIG. 8, when the locking cap 190 is finally dismantled from the nut 120, the nut 120 is ready to fasten the service valve 10 with the pipe 20 inserted to a normal depth.

In this process, in a state in which the locking cap 190 is separated from the nut 120 and prepared, as shown in FIG. 9, the valve port 11 of the service valve 10 is manually tightened to the first female screw 121 of the nut 120. 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. 10 , the valve port 11 is finally fastened to the nut 120 by a fastening tool. Then, the O-ring 10 for the valve 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 pressed against the protrusion 123 of the nut 120 to perform secondary sealing, so that the airtightness between the valve port 11 and the nut 120 is made of 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, the pipe connecting device 100 for the service valve of the present embodiment has no restrictions on the use of pipes 10 made of various materials, so that inexpensive aluminum pipes can be used, and the pipe 10 can be used directly without separate flaring in the field, thereby 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 can understand that various modifications and equivalent other embodiments are possible therefrom. 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.. Piping connector for service valve 110.. Bushing 112.. Bushing step
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
190.. locking cap 191.. cap body
192.. cap head 193.. cap fastening part
194. Elastic operating part 195.. Latch
196. Boss part 197.. Clasp protection part

Claims (4)

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 inside one opening, and a second female screw fastened to the male screw of the bushing is formed inside the other opening, and a nut formed with a protrusion that protrudes from the inner surface to the inclined surface of the valve port and is in close contact with it;
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, adjusts the insertion depth of the pipe, and then is disengaged from the nut so that the valve port is subsequently fastened;
Piping connector for service valves including a. 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 pipe connecting device for a service valve comprising: a central body portion that tightly inserts a pipe, a slanted stepped portion extending from the front end of the central body portion in a tapered form so as to engage the pipe tip, a plunger contact portion extending from the inclined stepped portion and contacting an inclined surface of the valve port, and a plunger inclined portion that extends from the rear end of the central body portion and presses the hook portions into the pipe. 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. According to claim 1,
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 in a hollow cylindrical shape from the rear surface of the cap head and having a male screw fastened to the first female screw of the nut on the outer surface thereof;
a pair of elastic actuators accommodated in the mounting hole of the cap head, one end of which is fixed to the cap head, and the other end of which is placed in a free state;
latches formed on free ends of the elastic actuating parts to be inserted into latch grooves of the nut as the cap body is fastened to the nut;
bosses protruding from the elastic actuating parts through the hollow of the cap fastening part to separate the clasps from the clasp groove 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;
A piping connector for a service valve comprising a.

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