Connecting piece for metal pipe and plastic pipe

Abstract

The utility model belongs to the technical field of pipes, and particularly relates to a connecting piece for a metal pipe and a plastic pipe, which comprises a connecting pipe and a tubular metal joint, one end of the connecting pipe is coaxially connected with the plastic pipe, the other end of the connecting pipe is inserted into the metal connector, and the outer wall of the connecting pipe is attached to the inner wall of the metal connector. The metal joint is detachably connected with the metal pipe; the connecting pipe comprises a plastic connecting part coaxially connected with the plastic pipe and a metal connecting part coaxially connected with the metal joint, and the plastic connecting part is aligned to and fixedly connected with a pipe orifice of the plastic pipe; the outer wall of the metal connecting part is attached to the inner wall of the metal connector. The nominal diameter of the plastic pipe is smaller than that of the metal pipe; the connector distance between the metal pipe and the plastic pipe is equal to the length of the connecting piece. The length of the connecting piece can be adjusted according to the interface distance between the metal pipe and the plastic pipe; and variable-diameter connection of the metal pipe and the plastic pipe can be realized, and the mounting space of a variable-diameter pipe fitting is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipes, and in particular relates to a connector for metal pipes and plastic pipes. Background Art

[0002] With urban development, residents' demand for water and gas has increased, necessitating the installation of corresponding water and gas pipelines. Plastic pipes are typically made from synthetic resins, typically polyester, with the addition of stabilizers, lubricants, and plasticizers. Due to their lightweight, corrosion-resistant, aesthetically pleasing appearance, lack of odor, ease of processing, and convenient installation, they are finding increasing application in construction projects.

[0003] Due to relevant national standards, plastic pipes cannot be directly connected to the user end, and steel-plastic conversion fittings are required to complete the entry of water and gas pipes into the home. Therefore, steel-plastic conversion fittings are widely used. In the past, the processing procedures of steel-plastic conversion fittings were relatively complicated, and internal rigid support rings were mostly used, which to a certain extent affected the flow of the medium inside the pipeline.

[0004] The most common connection technology for connecting plastic and metal pipes is flange connection. This requires installing a short flange pipe made of the same material at the end of each metal pipe and plastic pipe, and then connecting the short flange pipes with bolts. However, the disadvantage is that flange connection has strict requirements on the interface distance between the plastic and metal pipes. When the interface distance is too large or too small, other technical methods can only be used as an auxiliary method. Moreover, it is not suitable for connecting pipes of different diameters, and the installation is not convenient. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a connector for metal pipes and plastic pipes, which can realize the diameter-changing connection of metal pipes and plastic pipes and is suitable for connecting pipes with different interface distances.

[0006] The utility model is achieved in this way:

[0007] A connector for metal pipes and plastic pipes, comprising a connecting pipe and a tubular metal joint; one end of the connecting pipe is coaxially fixedly connected to the plastic pipe, and the other end of the connecting pipe is inserted into the metal joint; the metal joint is detachably connected to the metal pipe;

[0008] The connecting pipe includes a plastic connecting portion coaxially connected to the plastic pipe and a metal connecting portion coaxially connected to the metal joint; the plastic connecting portion is aligned and fixed with the pipe mouth of the plastic pipe; the outer wall of the metal connecting portion is in contact with the inner wall of the metal joint;

[0009] The nominal diameter of the plastic pipe is smaller than that of the metal pipe. The nominal diameter of the plastic pipe is the same as that of the connecting pipe. The outer wall of the connecting pipe fits against the inner wall of the metal joint. The nominal diameter of the metal joint is the same as that of the metal pipe;

[0010] The interface distance between the metal pipe and the plastic pipe is equal to the length of the connecting piece.

[0011] As a preferred technical solution, the plastic connecting part and the metal connecting part integrally formed therewith have the same nominal diameter.

[0012] As a preferred technical solution, the end of the metal joint away from the connecting pipe is flange-connected to the metal pipe.

[0013] As a preferred technical solution, a flange for coaxially connecting the metal pipe is circumferentially provided on the outer side of the end of the metal joint away from the plastic pipe, and the flange is bolt-connected to a second flange pre-installed at the interface end of the metal pipe.

[0014] As a preferred technical solution, a gasket is provided between the flange and the second flange.

[0015] As a preferred technical solution, the nominal diameter of the metal joint is one level larger than that of the metal connecting part.

[0016] As a preferred technical solution, the connecting pipe is made of a PE pipe.

[0017] As a preferred technical solution, the metal joint is made of a steel pipe.

[0018] The advantages and technical effects of the present utility model:

[0019] The present utility model includes a connecting pipe and a tubular metal joint; one end of the connecting pipe is coaxially and fixedly connected to a plastic pipe, and the other end of the connecting pipe is inserted into the metal joint; the metal joint is detachably connected to the metal pipe; the connecting pipe includes a plastic connecting part coaxially connecting the plastic pipe and a metal connecting part coaxially connecting the metal joint. The plastic connecting part is aligned with the pipe orifice of the plastic pipe and is connected by fusion or bonding; the outer wall of the metal connecting part fits against the inner wall of the metal joint; the nominal diameter of the plastic pipe is smaller than that of the metal pipe. The nominal diameter of the plastic pipe is the same as that of the connecting pipe. The outer wall of the connecting pipe fits against the inner wall of the metal joint. The nominal diameter of the metal joint is the same as that of the metal pipe; realizing the stepped connection between the metal pipe and the plastic pipe and saving the installation space of the stepped pipe fitting.

[0020] The interface distance between the metal pipe and the plastic pipe is equal to the length of the connector. Adjust the length of the connector according to the interface distance between the metal pipe and the plastic pipe to be connected; if the distance is greater than the length of the connector, fixedly connect a pipe of the same material and the same nominal diameter with a certain length at one end of the plastic connection part of the connecting pipe to increase the length of the connector; if the interface distance is less than the length of the connector, cut off the plastic connection part of the connecting pipe as required to shorten the overall length of the connector to match the interface distance between the pipes to be connected, so as to realize the connection of pipes with different distances. Brief Description of the Drawings

[0021] Figure 1 It is a side view of the connector for the metal pipe and the plastic pipe of the present invention;

[0022] Figure 2 is Figure 1 front view;

[0023] Figure 3 It is a side view of the present invention when connecting the metal pipe and the plastic pipe at the same time.

[0024] In the figure: 1. Connecting pipe; 11. Plastic connection part; 12. Metal connection part; 2. Metal joint; 3. Flange; 4. Plastic pipe; 5. Metal pipe. Detailed Description of the Invention

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] As Figures 1 to 2 shown, the present invention discloses a connector for a metal pipe and a plastic pipe, which includes a connecting pipe 1 and a metal joint 2; one end of the connecting pipe 1 is coaxially connected to the plastic pipe 4, and the other end of the connecting pipe is inserted into the metal joint 2, and the outer wall of the connecting pipe 1 is in contact with the inner wall of the metal joint 2; a flange 3 for coaxially connecting the metal pipe 5 is circumferentially provided on the outer side of the end of the metal joint 2 far from the plastic pipe 4;

[0027] The connecting pipe 1 includes a plastic connection part 11 and a metal connection part 12; the plastic connection part 11 is an exposed part for coaxially connecting with a plastic pipe 4 of the same nominal diameter; the metal connection part 12 is coaxially connected to the metal joint 2 and serves as a lining of the metal joint 2, and the outer wall of the metal connection part 12 is in close contact with the inner wall of the metal joint 2 to prevent the flowing gas or liquid from leaking.

[0028] For the connection between the plastic connection part 11 of the connecting pipe 1 and the plastic pipe 4, different connection methods are selected according to their materials. For example, when the connecting pipe 1 and the plastic pipe 4 are PE pipes, the pipe orifices of the two are aligned and welded; when the connecting pipe 1 and the plastic pipe 4 are PVC pipes, the pipe orifices of the two are aligned and bonded. The connection effect ensures that the seal between the plastic connection part 11 and the plastic pipe 4 is intact and no gas or liquid flowing through will leak. Preferably, the connecting pipe 1 is made of PE pipe.

[0029] Preferably, the interface distance between the metal pipe 5 and the plastic pipe 4 is equal to the length of the connector.

[0030] The length of the plastic connection part 11 can be adjusted according to the interface distance between the pipes to be connected. When the interface distance between the metal pipe 5 and the plastic pipe 4 is less than the length of the connector, the length of the connector is shortened by cutting off the plastic connection part 11; when the interface distance between the metal pipe 5 and the plastic pipe 4 is greater than the length of the connector, the plastic connection part 11 is fixedly connected to the same specification pipe to increase the length of the connector.

[0031] Preferably, the nominal diameters of the plastic connection part 11 and the metal connection part 12 integrally formed therewith are the same, and the nominal diameter of the plastic connection part 11 is the same as the nominal diameter of the connecting pipe 1.

[0032] The metal joint 2 is tubular and sleeved outside the metal connection part 12 to protect the metal connection part 12 and prevent it from being damaged during use.

[0033] Preferably, the flange 3 is bolted to the second flange pre-installed at the interface end of the metal pipe 5.

[0034] More preferably, the nominal diameter of the metal joint 2 is one level larger than the nominal diameter of the metal connection part 12 to avoid non-fitting between the metal connection part 12 and the metal joint 2 and resulting in leakage. The nominal diameter is the standardized diameter series of pipes and their accessories, which is represented by a number marked immediately after the letter DN. Since the nominal diameter uses integers, the outer diameter difference of one level of nominal diameter is uncertain. For example, in the large outer diameter series: DN15 one level larger is DN20, and the outer diameter difference is 5mm; DN100 one level larger is DN125, and the outer diameter difference is 26mm.

[0035] The nominal diameter of the metal joint 2 is the same as the nominal diameter of the metal pipe 5, that is, the nominal diameter of the plastic pipe 4 is one level smaller than the nominal diameter of the metal pipe 5, realizing the reduced-diameter connection between pipes of different materials.

[0036] More preferably, the length of the metal joint 2 is the same as the length of the metal connection part 12, and the increased contact area makes the combination of the two more stable.

[0037] Further preferably, the metal joint 2 is made of steel pipe, which has the advantages of high strength, strong corrosion resistance, energy conservation, environmental protection and easy processing.

[0038] Preferably, a gasket is added between the flange 3 and the second flange to make the connection tighter and prevent leakage.

[0039] Working principle:

[0040] Before installation, measure the interface distance between the metal pipe 5 and the plastic pipe 4 to be connected. If the interface distance is greater than the length of the connector, the plastic connecting part 11 of the plastic connecting part 11 of the connecting pipe 1 is fixedly connected to the same specification pipe to increase the length of the connector; if the interface distance between the metal pipe 5 and the plastic pipe 4 is less than the length of the connector, the plastic connecting part 11 of the connecting pipe 1 is intercepted according to actual needs to shorten the overall length of the connector to match the interface distance between the pipes to be connected. The connection of pipes with different distances is realized.

[0041] One end of the plastic connecting part 11 of the connecting pipe 1 away from the metal joint 2 is coaxially fixedly connected to the plastic pipe 4 with the same nominal diameter, ensuring that the seal between the plastic connecting part 11 and the plastic pipe 4 is intact and no gas or liquid flowing through will leak. A second flange matching the flange 3 needs to be installed in advance at the pipe end of the metal pipe 5 to be connected; the metal joint 2 and the metal pipe 5 are flange-connected, and a matching gasket is added between the flange 3 and the second flange to improve the tightness of the pipeline and ensure that no leakage occurs when gas or liquid flows through. The nominal diameter of the metal joint is the same as that of the metal pipe 5 and one level larger than that of the plastic pipe 4. The stepped connection between the metal pipe 5 and the plastic pipe 4 is realized, and the installation of stepped pipe fittings is omitted.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connector for a metal pipe and a plastic pipe, characterized in that: The connecting piece includes a connecting pipe (1) and a tubular metal joint (2); one end of the connecting pipe (1) is coaxially and fixedly connected to a plastic pipe (4), and the other end of the connecting pipe (1) is inserted into the metal joint (2); the metal joint (2) is detachably connected to a metal pipe (5). The connecting pipe (1) includes a plastic connecting part (11) coaxially connected to the plastic pipe (4) and a metal connecting part (12) coaxially connected to the metal joint (2); the plastic connecting part (11) is aligned and fixed with the pipe orifice of the plastic pipe (4); the outer wall of the metal connecting part (12) fits with the inner wall of the metal joint (2). The nominal diameter of the plastic pipe (4) is smaller than that of the metal pipe (5), the nominal diameter of the plastic pipe (4) is the same as that of the connecting pipe (1), the outer wall of the connecting pipe (1) fits with the inner wall of the metal joint (2), and the nominal diameter of the metal joint (2) is the same as that of the metal pipe (5). The interface distance between the metal pipe (5) and the plastic pipe (4) is equal to the length of the connecting piece.

2. The connector for metal pipes and plastic pipes according to claim 1, characterized in that: The plastic connecting part (11) and the integrally formed metal connecting part (12) have the same nominal diameter.

3. The connector for metal pipe and plastic pipe according to claim 1, characterized in that: The end of the metal joint (2) away from the plastic pipe (4) is flange-connected to the metal pipe (5).

4. The connector for metal pipe and plastic pipe according to claim 3, characterized in that: A flange plate (3) for coaxially connecting the metal pipe (5) is circumferentially provided on the outer side of the end of the metal joint (2) away from the plastic pipe (4), and the flange plate (3) is bolt-connected to a second flange plate installed at the interface end of the metal pipe (5).

5. The connector for metal pipes and plastic pipes according to claim 4, characterized in that: A gasket is provided between the flange plate (3) and the second flange plate.

6. The connector for metal pipes and plastic pipes according to claim 4, characterized in that: The nominal diameter of the metal joint (2) is one level larger than that of the metal connecting part (12).

7. The connector for metal pipe and plastic pipe according to claim 1, characterized in that: The connecting pipe (1) is made of a PE pipe.

8. The connector for metal pipe and plastic pipe according to claim 1, characterized in that: The metal joint (2) is made of a steel pipe.

Images