CN110645424A - A plastic-coated metal pipe threaded joint - Google Patents

Abstract

The invention belongs to the field of pipeline connection, and in particular relates to a plastic-coated metal pipe threaded joint, comprising a main nut, a rear portion of the main nut is provided with a built-in flaring compressor, and the outer edge of the rear end of the built-in flaring compressor extends backwards, The inner wall of the outer edge is threadedly connected to the positioning nut of the first flared compactor, the inner edge of the rear end of the built-in flared compactor is provided with a first outer conical surface protruding backward, and the front end of the positioning nut of the first flared compactor It has a first inner conical surface corresponding to the first outer conical surface. thread. The invention has the advantages of good sealing performance, convenient and fast installation, compact structure, and can make the plastic-coated metal pipe more widely used.

Description

A plastic-coated metal pipe threaded joint

technical field

The invention belongs to the field of pipe connection, in particular to a plastic-coated metal pipe thread joint.

Background technique

In the water supply system, stainless steel pipes, plastic pipes, composite pipes, plastic-coated metal pipes and plastic-coated copper pipes have become common pipes for pipeline systems. Plastic-coated metal pipes are widely recognized by the industry due to their advantages of safety, reliability, environmental protection and hygiene. However, in the prior art, there is still a lack of a reliable and convenient plastic-coated metal pipe threaded joint to match the use of the plastic-coated metal pipe, so that the plastic-coated metal pipe is more widely used and recognized.

SUMMARY OF THE INVENTION

In order to make up for the deficiencies of the prior art, the present invention provides a technical solution for a plastic-coated metal pipe threaded joint.

The plastic-coated metal pipe threaded joint is characterized in that it comprises a main nut, a rear portion of the main nut is provided with a built-in flaring compressor, and the rear end outer edge of the built-in flaring compressor extends backward, and the outer edge The inner wall is threadedly connected to the positioning nut of the first flared compactor, the inner edge of the rear end of the built-in flared compactor is provided with a first outer conical surface that protrudes backwards, and the front end of the first flared compactor positioning nut has a A first inner conical surface corresponding to the outer conical surface, the rear end of the first flaring compressor positioning nut has an inner thread of the first flaring compressor positioning nut for fixedly connecting the first plastic-coated metal pipe.

The plastic-covered metal pipe threaded joint is characterized in that the front part of the main nut is threadedly connected to an external thread flared compactor, and the front end outer edge of the externally threaded flared compactor extends forward, and the outer edge of the external thread flared compactor extends forward. The inner wall is threadedly connected with the positioning nut of the second flared compactor, the inner edge of the front end of the externally threaded flared compactor protrudes forward to form a second outer conical surface, and the rear end of the positioning nut of the second flared compactor has the same The two outer conical surfaces correspond to the second inner conical surface, and the front end of the second flaring compressor positioning nut has an inner thread of the second flaring compressor positioning nut for fixedly connecting the second plastic-coated metal pipe.

The plastic-covered metal pipe threaded joint is characterized in that an end face sealing ring is arranged between the rear end of the external thread flared compactor and the front end of the internal flared compactor.

The plastic-covered metal pipe threaded joint is characterized in that the front part of the nut hole of the main nut is a threaded hole, and the rear part is a through hole, and the through hole has a first step, so that the diameter of the front part of the through hole is A second step corresponding to the first step is provided on the built-in flare presser, which is larger than the diameter of the rear part, and the first step is fastened with the second step.

The plastic-covered metal pipe threaded joint is characterized in that the front end of the built-in flare compactor has an inner polygonal hole.

The plastic-coated metal pipe threaded joint is characterized in that the rear end of the first flaring presser positioning nut, the front end of the external thread flaring presser, and the second flaring presser positioning nut are separated. The front end is an outer polygon head structure.

The plastic-coated metal pipe threaded joint is characterized in that it includes an external thread flaring presser, the outer edge of the front end of the external thread flaring presser extends forward, and the inner wall of the outer edge is threadedly connected to the second flaring presser. The positioning nut of the tensioner, the inner edge of the front end of the external thread flared compactor protrudes forward to form a second outer conical surface, and the rear end of the second flared compactor positioning nut has a first outer conical surface corresponding to the second outer conical surface. There are two inner conical surfaces, and the front end of the positioning nut of the second flared compactor has an inner thread of the positioning nut of the second flared compactor for fixedly connecting the second plastic-coated metal pipe.

The plastic-coated metal pipe threaded joint is characterized in that the front end of the external thread flare presser and the front end of the positioning nut of the second flare presser are both external polygon head structures.

Compared with the prior art, the invention has the advantages of good sealing performance, convenient and fast installation, and compact structure, and can enable the plastic-coated metal pipe to be widely used.

Description of drawings

1 is a schematic cross-sectional view of Embodiment 1;

Fig. 2 is the exploded view of embodiment 1;

Fig. 3 is the enlarged view of D place in Fig. 1;

4 is a schematic cross-sectional view of a built-in flare compactor in Embodiment 1;

5 is a schematic cross-sectional view of the external thread flare compactor in Embodiment 1;

Fig. 6 is the cross-sectional structure schematic diagram of embodiment 2;

FIG. 7 is a schematic cross-sectional structure diagram of Embodiment 3. FIG.

In the figure: main nut 1, first step 10, built-in flare compactor 2, built-in flare compactor internal thread 20, first outer conical surface 21, second step 22, first flare compactor positioning Nut 3, first inner conical surface 30, second flaring presser positioning nut 4, external thread flaring presser 5, external thread flaring presser internal thread 50, second external conical surface 51, end face seal The ring 6 , the first plastic-coated metal tube 7 , and the second plastic-coated metal tube 8 .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Example 1

As shown in Figures 1-5, a plastic-coated metal pipe threaded joint includes a main nut 1. The front part of the nut hole of the main nut 1 is a threaded hole, and the rear part is a through hole with a smooth inner wall. The through hole has a first Step 10 so that the front diameter of the through hole is larger than the rear diameter. The threaded hole of the main nut 1 is threadedly connected to the external thread flare compactor 5, the through hole of the main nut 1 is provided with a built-in flare compactor 2, and the built-in flare compactor 2 has a first step corresponding to the first step 10. With two steps 22 , the first step 10 is engaged with the second step 22 , so that the inner flaring presser 2 is pressed backward by the external thread flaring presser 5 . The outer edge of the rear end of the built-in flare compactor 2 extends backward, the inner wall of the outer edge has an internal thread 20 of the built-in flared compactor, and the rear end inner edge of the built-in flared compactor 2 is provided with a rearwardly protruding No. An outer conical surface 21, the rear end of the outer edge is located behind the rear end of the inner edge, and a socket for inserting the first flaring presser positioning nut 3 is formed between the two. Specifically, the inner thread 20 of the built-in flare compactor 2 is threadedly connected to the first flare compactor positioning nut 3, and the inner edge of the front end of the first flare compactor positioning nut 3 is formed with the first flare compactor positioning nut 3. A first inner conical surface 30 corresponding to the outer conical surface 21 , the rear end of the first flaring presser positioning nut 3 has a first flaring presser positioning nut for fixedly connecting the first plastic-coated metal pipe 7 thread.

The outer edge of the front end of the external thread flare compactor 5 extends in advance, the inner wall of the outer edge is provided with an external thread flare compactor internal thread 50, and the front inner edge of the external thread flare compactor 5 protrudes forward to form The front end of the outer edge of the second outer conical surface 51 is positioned forward of the front end of the inner edge, and a socket for inserting the second flaring presser positioning nut 4 is formed therebetween. Specifically, the inner thread 50 of the outer flaring presser is threadedly connected to the second flaring presser positioning nut 4 , and the rear end of the second flaring presser positioning nut 4 has a corresponding second outer conical surface 51 . The front end of the second flaring presser positioning nut 4 has an inner thread of the second flaring presser positioning nut for fixedly connecting the second plastic-coated metal pipe 8 . The structure of the second flaring presser positioning nut 4 is basically the same as that of the first flaring presser positioning nut 3 .

An end face sealing ring 6 is provided between the rear end of the external thread flare compactor 5 and the front end of the internal flare compactor 2 .

The front end of the built-in flare compactor 2 has an inner polygonal hole, preferably an inner hexagonal hole, which is convenient for screwing with a hexagonal wrench.

The rear end of the first flaring presser positioning nut 3, the front end of the second flaring presser positioning nut 4 and the front end of the external thread flaring presser 5 are all external polygon head structures, preferably external. Hexagon head structure, easy to use an Allen wrench to twist.

When in use, the first flaring presser positioning nut 3 of the present invention is screwed with the first plastic-coated metal pipe 7, and the first flaring presser positioning nut inner thread of the first flaring presser positioning nut 3 is connected with the first flaring presser positioning nut. The plastic-covered skin of the first plastic-covered metal pipe 7 is engaged to achieve the purpose of connection. The front end metal pipe of the first plastic-covered metal pipe 7 is exposed, and then the part of the metal pipe is flared, and then the first flared is compressed. The positioning nut 3 is installed into the built-in flare compactor 2, so that the flared part of the metal tube is clamped on the first outer conical surface 21 of the built-in flare compactor 2 and the first flared compactor positioning nut 3 between the first inner conical surfaces 30 to achieve the purpose of sealing. The first step 10 of the main nut 1 hooks the second step 22 of the built-in flare press 2 , so that the built-in flare press 2 is compressed in the main nut 1 . The function of the external thread flare compactor 5 is similar to that of the built-in flare compactor 2. The front end of the external thread flare compactor 5 is screwed with the second flare compactor positioning nut 4, and the second flare compactor The positioning nut 4 and the external thread flare compactor 5 are connected to the second plastic-coated metal tube 8 in a manner that connects the first plastic-coated metal tube 7 with the positioning nut 3 and the built-in flare compactor 2 of the first flare compactor. The method is the same and will not be repeated here.

In addition, Example 1 can also be disassembled into the following Example 2 and Example 3 for use.

Example 2

As shown in FIG. 6 , on the basis of Embodiment 1, Embodiment 2 removes the positioning nut 4 of the second flare presser, the external thread flare presser 5 and the end face sealing ring 6, and other structures are completely the same.

The difference between Example 2 and Example 1 is that the front end of the main nut 1 is directly connected to a faucet or other liquid equipment or gaseous equipment, and the connected object is used to compress the built-in flaring presser 2, and the first flaring pressure The usage of the tightener positioning nut 3 and the built-in flare compressor 2 is the same as that of the first embodiment.

Example 3

As shown in FIG. 7 , a plastic-coated metal pipe threaded joint includes an external thread flare compactor 5, the rear of the external thread flare compactor 5 has external threads, and the front end of the external thread flare compactor 5 has an external thread. The outer edge extends forward, and the inner wall of the outer edge is provided with an inner thread 50 of an external thread flaring compressor. The internal thread 50 of the presser is threadedly connected to the second flare presser positioning nut 4, and the rear end of the second flare presser positioning nut 4 has a second inner conical surface corresponding to the second outer conical surface 51, and the second The front end of the flaring presser positioning nut 4 has an inner thread of the second flaring presser positioning nut for fixedly connecting the second plastic-coated metal pipe 8 .

The front end of the external thread flare presser 5 and the front end of the second flare presser positioning nut 4 are both of an external polygon head structure, preferably an external hexagon head structure, which is convenient for screwing with an Allen wrench.

The structures of the above-mentioned external thread flare compactor 5 and the second flare compactor positioning nut 4 are exactly the same as those of the first embodiment.

The usage method of Embodiment 3 refers to Embodiment 1, and the difference is only that the rear end of the external thread flare compactor 5 is directly connected to a faucet or other liquid equipment or gas equipment.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (8)

1. A plastic-coated metal pipe threaded joint, characterized in that it comprises a main nut (1), the rear of the main nut (1) is provided with a built-in flaring compressor (2), and the The outer edge of the rear end extends rearward, the inner wall of the outer edge is threadedly connected to the positioning nut (3) of the first flared presser, and the inner edge of the rear end of the built-in flared presser (2) is provided with a first outer protruding rearward. Conical surface (21), the front end of the first flaring compressor positioning nut (3) has a first inner conical surface (30) corresponding to the first outer conical surface (21), and the first flaring compressor positioning nut The rear end of (3) has an inner thread of the positioning nut of the first flaring presser for fixedly connecting the first plastic-coated metal pipe (7). 2. A plastic-coated metal pipe threaded joint according to claim 1, characterized in that the front part of the main nut (1) is threadedly connected to the external thread flare compactor (5), and the external thread flare is pressed tightly The outer edge of the front end of the device (5) extends forward, the inner wall of the outer edge is threadedly connected to the positioning nut (4) of the second flared compactor, and the front inner edge of the externally threaded flared compactor (5) protrudes forward to form The second outer conical surface (51), the rear end of the second flaring presser positioning nut (4) has a second inner conical surface corresponding to the second outer conical surface (51), and the second flaring presser is positioned The front end of the nut (4) has an inner thread of the positioning nut of the second flaring presser for fixedly connecting the second plastic-coated metal pipe (8). 3. A plastic-coated metal pipe threaded joint according to claim 2, characterized in that between the rear end of the external thread flare compactor (5) and the front end of the built-in flare compactor (2) Set the face seal (6). 4. A plastic-coated metal pipe threaded joint according to any one of claims 1-3, characterized in that the front part of the nut hole of the main nut (1) is a threaded hole, and the rear part is a through hole. There is a first step (10) on the hole, so that the diameter of the front part of the through hole is larger than the diameter of the rear part, and the built-in flare compactor (2) has a second step (22) corresponding to the first step (10). A step (10) is engaged with the second step (22). 5. A plastic-coated metal pipe threaded joint according to any one of claims 1-3, characterized in that the front end of the built-in flare compactor (2) has an inner polygonal hole. 6. A plastic-coated metal pipe threaded joint according to claim 2 or 3, characterized in that the rear end of the first flaring presser positioning nut (3), the external thread flaring presser (5) ) and the front end of the second flaring presser positioning nut (4) are both of the outer polygon head structure. 7. A plastic-coated metal pipe threaded joint, characterized in that it comprises an external thread flared compactor (5), the front end outer edge of the externally threaded flared compactor (5) extends forward, and the inner wall of the outer edge is threadedly connected The second flaring compressor positioning nut (4), the inner edge of the front end of the external thread flaring compressor (5) protrudes forward to form a second outer conical surface (51), the second flaring compressor positioning nut The rear end of (4) has a second inner conical surface corresponding to the second outer conical surface (51), and the front end of the second flaring presser positioning nut (4) has a 8) The inner thread of the second flared retainer locating nut. 8. A plastic-coated metal pipe threaded joint according to claim 7, characterized in that the front end of the external thread flare presser (5) and the front end of the second flare presser positioning nut (4) Both are outer polygon head structures.

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