PIPE FITTING CONNECTING METHOD AND CONNECTING STRUCTURE

Abstract

A pipe fitting connecting method and a connecting structure, comprising the following steps of: providing an elastic sleeve (10) at the position of an end opening of a pipe material (20) in a sleeving manner, and clamping the pipe material by means of a clamping sleeve (01) of a push tool; fixing a connecting pipe body (30) to a clamping ring (02) of the push tool, the front end of an insertion end (310) of the connecting pipe body being a guiding-in section (312), the rear end of the insertion section of the connecting pipe body being an expansion section (314), the outer diameter of the guiding-in section being equal to the inner diameter of the pipe material, and a conical ring (316) with a small front end and a large rear end being provided on the periphery of the expansion section; and enabling the insertion end of the connecting pipe body (30) to be forcefully inserted into the pipe material, the pipe material and the elastic sleeve (10) being gradually expanded along the conical ring (316) of the expansion section, and when the insertion end (310) is inserted in place, the pipe material and the elastic sleeve retracting, so as to enable the pipe material (20) and the connecting pipe body (30) to be tightly connected. Without an expansion tool, expansion is conducted directly by means of the insertion end of the connecting pipe body, thereby saving a large amount of working time; the pipe material and the elastic sleeve are evenly expanded in a whole circumference manner, thereby effectively avoiding pipe material damage caused by excessive expansion.

Claims

1. A pipe fitting connecting method, comprising: sleeving an elastic sleeve on a pipe at a port of the pipe, and clamping the pipe by a jacket of a pushing tool; fastening a connecting pipe body to a snap ring of the pushing tool, wherein a front end portion of an inserting part of the connecting pipe body is a guiding section, a rear end portion of the inserting part of the connecting pipe body is an expansion section, an outer diameter of the guiding section is equal to an inner diameter of the pipe, and an outer periphery of the expansion section is provided with a conical ring having a small front end and a large rear end; and activating the pushing tool to force the inserting part of the connecting pipe body to be inserted into the pipe in such a way that the pipe and the elastic sleeve are gradually expanded along the conical ring of the expansion section, and when the inserting part is inserted in place, the pipe and the elastic sleeve retracts so that the pipe is tightly connected to the connecting pipe body.

2. The pipe fitting connecting method according to claim 1, wherein the connecting pipe body is provided with an annular protrusion, the protrusion is provided with an annular groove, and the connecting pipe body is fastened to a U-shaped snap ring of the pushing tool through the annular groove.

3. The pipe fitting connecting method according to claim 1, wherein the expansion section is provided with two conical rings sequentially along a length direction of the expansion section, and the inserting part expands the pipe and the elastic sleeve through the two conical rings.

4. The pipe fitting connecting method according to claim 3, wherein the conical ring has a cross section in a triangular tooth shape, a trapezoidal tooth shape or an arc tooth shape.

5. The pipe fitting connecting method according to claim 2, wherein an end of the elastic sleeve close to the port of the pipe is provided with a plurality of barbs, the barbs are arranged in a circumferential direction of the elastic sleeve, and the barbs are adapted to catch an end face of the pipe.

6. The pipe fitting connecting method according to claim 2, wherein an end of the elastic sleeve close to the port of the pipe is provided with a retaining ring, and the retaining ring is adapted to abut against an end face of the pipe.

7. The pipe fitting connecting method according to claim 1, wherein a front end of the guiding section is provided with a chamfer.

8. The pipe fitting connecting method according to claim 1, wherein the connecting pipe body is a rigid plastic fitting or a metal fitting, and the elastic sleeve is a plastic sleeve or a metal sleeve each having a property of retraction.

9. The pipe fitting connecting method according to claim 2, wherein both ends of the connecting pipe body are inserting parts, the annual groove is disposed between two inserting parts, and the inserting parts at the both ends of the connecting pipe body are adapted to be inserted into two pipes respectively so that the two pipes are connected together.

10. A pipe connecting structure, comprising a connecting pipe body and an elastic sleeve, wherein the elastic sleeve is sleeved on a pipe to be connected, a front end portion of an inserting part of the connecting pipe body is a guiding section, a rear end portion of the inserting part of the connecting pipe body is an expansion section, an outer diameter of the guiding section is equal to an inner diameter of the pipe, an outer periphery of the expansion section is provided with a conical ring having a small front end and a large rear end, and the inserting part is inserted into the pipe by the pipe fitting connecting method according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a schematic structural diagram showing a connecting pipe body and a pipe prior to connection according to an embodiment.

[0021] FIG. 2 is a schematic cross-sectional diagram showing a connecting pipe body and a pipe after connection according to an embodiment.

DESCRIPTION OF THE REFERENCE SIGNS

[0022] 01, jacket; 02, snap ring; 10, elastic sleeve; 110, barb; 20, pipe; 30, connecting pipe body; 310, inserting part; 312, guiding section; 314, expansion section; 316, conical ring; 318, chamfer; 320, annular protrusion; and 322, annular groove.

DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present disclosure, the present disclosure is described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present disclosure are shown in the accompanying drawings. The various embodiments of the present disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly and completely understood.

[0024] It should be noted that when an element is referred to as being fastened to another element, it can be directly on another element or an intermediate element can be present. When an element is referred to as being connected to another element, it can be directly connected to another element or an intermediate element can be present. Rather, when an element is referred to as being directly on another element, there is no intermediate element. The terms vertical, horizontal, left, right and the like, as used herein, are used for purposes of illustration only and do not represent any embodiment.

[0025] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise defined. The terminology used in the description of the present disclosure is for the purpose of describing particular embodiments and is not intended to limit the invention. The term and/or used herein includes any and all combinations of one or more of the associated listed items.

[0026] Referring to FIG. 1 and FIG. 2, a pipe fitting connecting method includes the following steps:

[0027] sleeving an elastic sleeve 10 on a pipe 20 at a port of the pipe 20, and clamping the pipe 20 by a jacket 01 of a pushing tool;

[0028] fastening a connecting pipe body 30 to a snap ring 02 of the pushing tool, a front end portion of an inserting part 310 of the connecting pipe body 30 being a guiding section 310, a rear end portion of the inserting part of the connecting pipe body 30 being an expansion section 314, an outer diameter of the guiding section 312 being equal to an inner diameter of the pipe 20, and an outer periphery of the expansion section 314 being provided with a conical ring 316 having a small front end and a large rear end; and

[0029] activating the pushing tool to force the inserting part 310 of the connecting pipe body 30 to be inserted into the pipe 20 in such a way that the pipe 20 and the elastic sleeve 10 are gradually expanded along the conical ring 316 of the expansion section 314, and when the inserting part 310 is inserted in place, the pipe 20 and the elastic sleeve 10 retracts so that the pipe 20 is tightly connected to the connecting pipe body 30.

[0030] In this method, the elastic sleeve 10 having a resilience property to an extent is sleeved on the pipe 20 in advance, and then the inserting part 310 of the connecting pipe body 30 is inserted into the pipe 20. The guiding section 312 of the inserting part 310 plays a role of guiding the insertion. An end of the conical ring 316 of the expansion section 314 close to the guiding section 312 has a small diameter, and the other end of the conical ring 316 away from the guiding section 312 has a large diameter. The pipe 20 and the elastic sleeve 10 are gradually expanded along with the insertion of the inserting part 310. When the inserting part 310 is inserted in place, the pipe 20 and the elastic sleeve 10 retract so that the inner surface of the pipe 20 is tightly connected to the outer surface of the connecting pipe body 30, and the elastic force of the elastic sleeve 10 presses against the outer surface of the pipe 20, thereby further improving the sealing performance between the pipe 20 and the connecting pipe body 30. In contrast to the conventional pipe fitting connecting method, in the present disclosure the expanding operation is directly preformed through the inserting part 310 of the connecting pipe body 30, without using an expander. The operation can be done in one step, and thus a lot of working time can be saved. Moreover, when the inserting part 310 is inserted into the pipe 20, the pipe 20 and the elastic sleeve 10 are uniformly enlarged over the entire periphery, as long as the expansion amount is sufficient for the insertion of the inserting part 310, thereby effectively solving the pipe 20 damage caused by the excessive expansion. In addition, the conical ring 316 of the expansion section 314 having a small front end and a large rear end forms a barb-like structure, which makes the inserted pipe 20 difficult to be pulled out, further improves the reliability of the connection between the pipe 20 and the connecting pipe body. Moreover, the elastic sleeve 10 and the pipe 20 are expanded and then retract together, so that the connecting pipe body is pressed tightly, thereby achieving a firmly connection and sealing without using a sealing ring. In this embodiment, the front end portion refers to an end portion close to the front in an insertion direction of the inserting part 310, and a reverse end portion is the rear end portion.

[0031] As shown in FIG. 1 and FIG. 2, the connecting pipe body 30 is provided with an annular protrusion 320, the protrusion is provided with an annular groove 322, and the connecting pipe body 30 is fastened to the U-shaped snap ring 02 of the pushing tool through the annular groove 322. The annular protrusion 320 is not only provided with the annular groove 322 configured to fasten the connecting pipe body 30 to the snap ring 02 of the pushing tool, but also acts as a limit after the inserting part 310 is inserted into the pipe 20. When an end face of the pipe 20 abuts against the annular protrusion 320, the inserting part 310 is inserted in place and no longer continues to insert. A front end of the guiding section 312 is provided with a chamfer 318, in order to facilitate inserting the inserting part 310 into the pipe 20.

[0032] Further, the expansion section 314 is provided with two conical rings 316 sequentially in a length direction of the expansion section 314. The inserting part 310 expands the pipe 20 and the elastic sleeve 10 through the two conical rings 316. Since the diameter of the large end of each conical ring is larger than the inner diameter of the pipe 20, lengths of portions of the pipe 20 and the elastic sleeve 10 being expanded are increased, by means of the pipe 20 and the elastic sleeve 10 being expanded by the two conical rings 316 together. Therefore, the area where the pipe 20 and the elastic sleeve 10 closely connected to the connecting pipe body is increased after the retraction of the pipe 20 and the elastic sleeve 10, and the sealing performance and the reliability of the connection are further improved.

[0033] As shown in FIG. 2, the cross section of the conical ring 316 is in a triangular tooth shape in this embodiment, so that the inserting part 310 only can enter into the inner hole of the pipe 20 but cannot be pulled out after the inserting part 310 is inserted into the pipe 20. The cross section of the conical ring may be in a trapezoidal tooth shape or an arc tooth shape as required.

[0034] As shown in FIG. 1 and FIG. 2, an end of the elastic sleeve 10 close to the port of the pipe 20 is provided with a plurality of barbs 110, the barbs 110 are arranged in a circumferential direction of the elastic sleeve 10, and the barbs 110 are adapted to catch an end face of the pipe 20. When the barbs 110 catch the end face of the pipe 20, the elastic sleeve 10 can be firmly fixed at the port of the pipe 20 during the pulling process without being displaced. According to actual needs, it is possible that a retaining ring is disposed at an end of the elastic sleeve 10 close to the port of the pipe 20. The retaining ring abuts against the end face of the pipe 20 to stabilize the elastic sleeve 10.

[0035] The connecting pipe body 30 is a rigid plastic fitting or a metal fitting, made of for example, copper, stainless steel, PPSU, etc., which is able to expand the pipe 20. The elastic sleeve 10 is a plastic sleeve or a metal sleeve each having a retraction property, made of for example, PE, 301 stainless steel, etc., which can press the pipe 20 on the connecting pipe body 30 tightly by elastic force.

[0036] As shown in FIG. 1 and FIG. 2, both ends of the connecting pipe body are inserting parts. The annual groove 322 is disposed between two inserting parts 310, the inserting parts 310 of the both ends of the connecting pipe body 30 are inserted into two pipes 20 respectively so that the two pipes 20 are connected together. That is, the inserting parts 310 at the both ends of the connecting pipe body 30 are respectively inserted into two different pipes 20 to realize sealing connection between the two pipes 20. According to actual needs, the connecting pipe body 30 may be a tee pipe with three inserting parts, a four-way pipe with four inserting parts or the like, thereby realizing connection of three pipes, four pipes and the like.

[0037] As shown in FIG. 1 and FIG. 2, a pipe connecting structure includes a connecting pipe body 30 and an elastic sleeve 10. The elastic sleeve 10 is sleeved on a pipe 20 to be connected. A front end portion of an inserting part 310 of the connecting pipe body 30 is a guiding section 312, and a rear end portion of the inserting part of the connecting pipe body 30 is an expansion section 314. An outer diameter of the guiding section 312 is equal to an inner diameter of the pipe 20. An outer periphery of the expansion section 314 is provided with a conical ring 316 having a small front end and a large rear end. The inserting part 310 is inserted into the pipe 20 by the pipe fitting connecting method. The pipe connecting structure has the advantages of tight connection, good sealing effect, simple structure and convenient operation, and the pipe 20 is not easy to be cracked during the connecting process.

[0038] All of the technical features in the above embodiments may be employed in arbitrary combinations. For purpose of simplifying the description, not all arbitrary combinations of the technical features in the above embodiments are described. However, as long as such combinations of the technical features are not contradictory, they should be considered as within the scope of the disclosure in this specification.

[0039] The above embodiments merely represent several embodiments of the present disclosure, and the description thereof is more specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that for those skilled in the art, several variations and improvements may be made without departing from the concept of the present disclosure. And these are all within the protection scope of the present invention. Therefore, the scope of protection of the present disclosure shall be subject to the appended claims.