Spiral-type flexible pipe connector

1. A spiral-type flexible pipe connector, comprising:

a socket, into which one end of a spiral-type flexible pipe is inserted;

a nut configured to be screw-connected to the socket to fix the spiral-type flexible pipe to the socket; and

a packing located between the one end of the spiral-type flexible pipe and the socket, wherein the packing includes a sealing portion, into which a tip of the one end of the spiral-type flexible pipe is inserted such that the sealing portion surrounds the tip of the one end of the spiral-type flexible pipe, wherein the socket includes a recess, into which the sealing portion of the packing surrounding the tip of the one end of the spiral-type flexible pipe is inserted such that the sealing portion is in close contact with an inner circumferential surface and an outer circumferential surface of the recess, wherein a diameter of the inner circumferential surface of the recess is substantially the same as or larger than a diameter of an inner circumferential surface of the sealing portion and a diameter of the outer circumferential surface of the recess is substantially the same as or less than a diameter of an outer circumferential surface of the sealing portion to provide the close contact by an interference fit, wherein the diameter of the outer circumferential surface of the recess gradually increases along a length thereof as it extends from an inner portion thereof toward the nut, wherein the diameter of the outer circumferential surface of the sealing portion gradually decreases along a length thereof in a direction toward the socket, wherein the packing further includes an extension portion that extends from the sealing portion in a direction of the nut and is adhered closely to an outer circumferential surface of the spiral-type flexible pipe, and wherein the sealing portion of the packing includes:

an outer sealing portion, from which the extension portion integrally extends, adhered closely to an outer circumferential surface of the tip of the one end of the spiral-type flexible pipe; and

an inner sealing part adhered closely to an inner circumferential surface of the tip of the one end of the spiral-type flexible pipe.

2. The spiral-type flexible pipe connector according to claim 1 , further comprising a support ring connected to the spiral-type flexible pipe and located between the packing and the nut.

3. The spiral-type flexible pipe connector according to claim 1 , wherein the recess is formed by a projecting pipe portion that protrudes from the socket toward the nut.

4. The spiral-type flexible pipe connector according to claim 3 , wherein the socket includes a passage hole that communicates with a corresponding passage hole formed in the packing.

5. The spiral-type flexible pipe connector according to claim 4 , wherein the passage hole of the socket extends through the projecting pipe portion.

6. The spiral-type flexible pipe connector according to claim 5 , wherein the passage hole formed in the packing is configured to receive an end of the projecting pipe portion inserted therein.

7. The spiral-type flexible pipe connector according to claim 1 , wherein a length of the sealing portion of the packing corresponds to a depth of the recess.

8. The spiral-type flexible pipe connector according to claim 1 , wherein a groove, into which the tip of the one end of the spiral-type flexible pipe is inserted, is formed in the sealing portion.

9. The spiral-type flexible pipe connector according to claim 1 , wherein the packing is made of an elastically deformable material.

10. The spiral-type flexible pipe connector according to claim 1 , wherein the packing is screw-connected to the spiral-type flexible pipe.

11. The spiral-type flexible pipe connector according to claim 1 , wherein a diameter of an outer circumferential surface of the socket gradually increases as it extends from a portion thereof adjacent an end of the recess into which the sealing portion is received toward the nut and a diameter of an inner circumferential surface of the nut gradually decreases as it extends away from the socket such that the socket presses the packing inserted thereinto toward the flexible pipe when the nut is screw-connected to the socket.

12. A spiral-type flexible pipe connector, comprising:

a socket, into which one end of a spiral-type flexible pipe is inserted;

a nut configured to be screw-connected to the socket to fix the spiral-type flexible pipe to the socket;

a packing located between the one end of the spiral-type flexible pipe and the socket, wherein the packing includes a sealing portion, into which a tip of the one end of the spiral-type flexible pipe is inserted such that the sealing portion surrounds the tip of the one end of the spiral-type flexible pipe, wherein the socket includes a recess, into which the sealing portion of the packing surrounding the tip of the one end of the spiral-type flexible pipe is inserted such that the sealing portion is in close contact with an inner circumferential surface and an outer circumferential surface of the recess, wherein a diameter of the inner circumferential surface of the recess is substantially the same as or larger than a diameter of an inner circumferential surface of the sealing portion and a diameter of the outer circumferential surface of the recess is substantially the same as or less than a diameter of an outer circumferential surface of the sealing portion to provide the close contact by an interference fit, wherein the diameter of the outer circumferential surface of the recess gradually increases along a length thereof as it extends from an inner portion thereof toward the nut, wherein the diameter of the outer circumferential surface of the sealing portion gradually decreases along a length thereof in a direction toward the socket; and

a support ring connected to the spiral-type flexible pipe and located between the packing and the nut, wherein the support ring is screw-connected to an outer circumferential surface of the spiral-type flexible pipe.

13. A spiral-type flexible pipe connector, comprising:

a socket, into which one end of a spiral-type flexible pine is inserted;

a nut configured to be screw-connected to the socket to fix the spiral-type flexible pipe to the socket; and

a packing located between the one end of the spiral-type flexible pipe and the socket, wherein the packing includes a sealing portion, into which a tip of the one end of the spiral-type flexible pipe is inserted such that the sealing portion surrounds the tip of the one end of the spiral-type flexible pipe, wherein the socket includes a recess, into which the sealing portion of the packing surrounding the tip of the one end of the spiral-type flexible pipe is inserted such that the sealing portion is in close contact with an inner circumferential surface and an outer circumferential surface of the recess, wherein a diameter of the inner circumferential surface of the recess is substantially the same as or larger than a diameter of an inner circumferential surface of the sealing portion and a diameter of the outer circumferential surface of the recess is substantially the same as or less than a diameter of an outer circumferential surface of the sealing portion to provide the close contact by an interference fit, wherein the diameter of the outer circumferential surface of the recess gradually increases along a length thereof as it extends from an inner portion thereof toward the nut, wherein the diameter of the outer circumferential surface of the sealing portion gradually decreases along a length thereof in a direction toward the socket, wherein a groove, into which the tip of the one end of the spiral-type flexible pipe is inserted, is formed in the sealing portion, wherein the groove is formed in a spiral shape.